Adding upstream version 4:7.4.7.upstream/4%7.4.7upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 2292 insertions, 0 deletions

diff --git a/slideshow/source/engine/opengl/TransitionImpl.cxx b/slideshow/source/engine/opengl/TransitionImpl.cxx
new file mode 100644
index 000000000..ba43acddc
--- /dev/null
+++ b/slideshow/source/engine/opengl/TransitionImpl.cxx
@@ -0,0 +1,2292 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*************************************************************************
+ *
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * Copyright 2008 by Sun Microsystems, Inc.
+ *
+ * OpenOffice.org - a multi-platform office productivity suite
+ *
+ * This file is part of OpenOffice.org.
+ *
+ * OpenOffice.org is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License version 3
+ * only, as published by the Free Software Foundation.
+ *
+ * OpenOffice.org is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Lesser General Public License version 3 for more details
+ * (a copy is included in the LICENSE file that accompanied this code).
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * version 3 along with OpenOffice.org.  If not, see
+ * <http://www.openoffice.org/license.html>
+ * for a copy of the LGPLv3 License.
+ *
+ ************************************************************************/
+
+#include <glm/gtc/matrix_transform.hpp>
+#include <glm/gtc/type_ptr.hpp>
+#include <vcl/opengl/OpenGLHelper.hxx>
+#include <vcl/opengl/OpenGLContext.hxx>
+#include <sal/log.hxx>
+
+#include <algorithm>
+#include <array>
+
+#include <comphelper/random.hxx>
+
+#include "Operation.hxx"
+#include "TransitionImpl.hxx"
+#include <cmath>
+
+TransitionScene::TransitionScene(TransitionScene const& rOther)
+    : maLeavingSlidePrimitives(rOther.maLeavingSlidePrimitives)
+    , maEnteringSlidePrimitives(rOther.maEnteringSlidePrimitives)
+    , maOverallOperations(rOther.maOverallOperations)
+    , maSceneObjects(rOther.maSceneObjects)
+{
+}
+
+TransitionScene& TransitionScene::operator=(const TransitionScene& rOther)
+{
+    TransitionScene aTmp(rOther);
+    swap(aTmp);
+    return *this;
+}
+
+void TransitionScene::swap(TransitionScene& rOther)
+{
+    using std::swap;
+
+    swap(maLeavingSlidePrimitives, rOther.maLeavingSlidePrimitives);
+    swap(maEnteringSlidePrimitives, rOther.maEnteringSlidePrimitives);
+    swap(maOverallOperations, rOther.maOverallOperations);
+    swap(maSceneObjects, rOther.maSceneObjects);
+}
+
+OGLTransitionImpl::~OGLTransitionImpl()
+{
+}
+
+void OGLTransitionImpl::uploadModelViewProjectionMatrices()
+{
+    double EyePos(10.0);
+    double const RealF(1.0);
+    double const RealN(-1.0);
+    double const RealL(-1.0);
+    double RealR(1.0);
+    double const RealB(-1.0);
+    double RealT(1.0);
+    double ClipN(EyePos+5.0*RealN);
+    double ClipF(EyePos+15.0*RealF);
+    double ClipL(RealL*8.0);
+    double ClipR(RealR*8.0);
+    double ClipB(RealB*8.0);
+    double ClipT(RealT*8.0);
+
+    glm::mat4 projection = glm::frustum<float>(ClipL, ClipR, ClipB, ClipT, ClipN, ClipF);
+    //This scaling is to take the plane with BottomLeftCorner(-1,-1,0) and TopRightCorner(1,1,0) and map it to the screen after the perspective division.
+    glm::vec3 scale(1.0 / (((RealR * 2.0 * ClipN) / (EyePos * (ClipR - ClipL))) - ((ClipR + ClipL) / (ClipR - ClipL))),
+                    1.0 / (((RealT * 2.0 * ClipN) / (EyePos * (ClipT - ClipB))) - ((ClipT + ClipB) / (ClipT - ClipB))),
+                    1.0);
+    projection = glm::scale(projection, scale);
+    glm::mat4 modelview = glm::translate(glm::mat4(), glm::vec3(0, 0, -EyePos));
+
+    GLint location = glGetUniformLocation( m_nProgramObject, "u_projectionMatrix" );
+    if( location != -1 ) {
+        glUniformMatrix4fv(location, 1, false, glm::value_ptr(projection));
+        CHECK_GL_ERROR();
+    }
+
+    location = glGetUniformLocation( m_nProgramObject, "u_modelViewMatrix" );
+    if( location != -1 ) {
+        glUniformMatrix4fv(location, 1, false, glm::value_ptr(modelview));
+        CHECK_GL_ERROR();
+    }
+}
+
+static std::vector<int> uploadPrimitives(const Primitives_t& primitives)
+{
+    int size = 0;
+    for (const Primitive& primitive: primitives)
+        size += primitive.getVerticesByteSize();
+
+    CHECK_GL_ERROR();
+    glBufferData(GL_ARRAY_BUFFER, size, nullptr, GL_STATIC_DRAW);
+    CHECK_GL_ERROR();
+    Vertex *buf = static_cast<Vertex*>(glMapBuffer(GL_ARRAY_BUFFER, GL_WRITE_ONLY));
+
+    std::vector<int> indices;
+    int last_pos = 0;
+    for (const Primitive& primitive: primitives) {
+        indices.push_back(last_pos);
+        int num = primitive.writeVertices(buf);
+        buf += num;
+        last_pos += num;
+    }
+
+    CHECK_GL_ERROR();
+    glUnmapBuffer(GL_ARRAY_BUFFER);
+    CHECK_GL_ERROR();
+    return indices;
+}
+
+bool OGLTransitionImpl::prepare( sal_Int32 glLeavingSlideTex, sal_Int32 glEnteringSlideTex, OpenGLContext *pContext )
+{
+    m_nProgramObject = makeShader();
+    if (!m_nProgramObject)
+        return false;
+
+    CHECK_GL_ERROR();
+    glUseProgram( m_nProgramObject );
+    CHECK_GL_ERROR();
+
+    const SceneObjects_t& rSceneObjects(maScene.getSceneObjects());
+    for(size_t i(0); i != rSceneObjects.size(); ++i) {
+        rSceneObjects[i]->prepare(m_nProgramObject);
+    }
+
+    GLint location = glGetUniformLocation( m_nProgramObject, "leavingSlideTexture" );
+    if( location != -1 ) {
+        glUniform1i( location, 0 );  // texture unit 0
+        CHECK_GL_ERROR();
+    }
+
+    location = glGetUniformLocation( m_nProgramObject, "enteringSlideTexture" );
+    if( location != -1 ) {
+        glUniform1i( location, 2 );  // texture unit 2
+        CHECK_GL_ERROR();
+    }
+
+    uploadModelViewProjectionMatrices();
+
+    m_nPrimitiveTransformLocation = glGetUniformLocation( m_nProgramObject, "u_primitiveTransformMatrix" );
+    m_nSceneTransformLocation = glGetUniformLocation( m_nProgramObject, "u_sceneTransformMatrix" );
+    m_nOperationsTransformLocation = glGetUniformLocation( m_nProgramObject, "u_operationsTransformMatrix" );
+    m_nTimeLocation = glGetUniformLocation( m_nProgramObject, "time" );
+
+    glGenVertexArrays(1, &m_nVertexArrayObject);
+    glBindVertexArray(m_nVertexArrayObject);
+
+    glGenBuffers(1, &m_nVertexBufferObject);
+    glBindBuffer(GL_ARRAY_BUFFER, m_nVertexBufferObject);
+
+    // In practice both leaving and entering slides share the same primitives.
+    m_nFirstIndices = uploadPrimitives(getScene().getLeavingSlide());
+
+    // Attribute bindings
+    m_nPositionLocation = glGetAttribLocation(m_nProgramObject, "a_position");
+    if (m_nPositionLocation != -1) {
+        glEnableVertexAttribArray(m_nPositionLocation);
+        glVertexAttribPointer( m_nPositionLocation, 3, GL_FLOAT, false, sizeof(Vertex), reinterpret_cast<void*>(offsetof(Vertex, position)) );
+        CHECK_GL_ERROR();
+    }
+
+    m_nNormalLocation = glGetAttribLocation(m_nProgramObject, "a_normal");
+    if (m_nNormalLocation != -1) {
+        glEnableVertexAttribArray(m_nNormalLocation);
+        glVertexAttribPointer( m_nNormalLocation, 3, GL_FLOAT, false, sizeof(Vertex), reinterpret_cast<void*>(offsetof(Vertex, normal)) );
+        CHECK_GL_ERROR();
+    }
+
+    m_nTexCoordLocation = glGetAttribLocation(m_nProgramObject, "a_texCoord");
+    if (m_nTexCoordLocation != -1) {
+        glEnableVertexAttribArray(m_nTexCoordLocation);
+        glVertexAttribPointer( m_nTexCoordLocation, 2, GL_FLOAT, false, sizeof(Vertex), reinterpret_cast<void*>(offsetof(Vertex, texcoord)) );
+        CHECK_GL_ERROR();
+    }
+
+    glBindBuffer(GL_ARRAY_BUFFER, 0);
+    CHECK_GL_ERROR();
+
+    prepareTransition( glLeavingSlideTex, glEnteringSlideTex, pContext );
+    return true;
+}
+
+void OGLTransitionImpl::finish()
+{
+    const SceneObjects_t& rSceneObjects(maScene.getSceneObjects());
+    for(size_t i(0); i != rSceneObjects.size(); ++i) {
+        rSceneObjects[i]->finish();
+    }
+
+    finishTransition();
+
+    CHECK_GL_ERROR();
+    if( m_nProgramObject ) {
+        glDeleteBuffers(1, &m_nVertexBufferObject);
+        m_nVertexBufferObject = 0;
+        glDeleteVertexArrays(1, &m_nVertexArrayObject);
+        m_nVertexArrayObject = 0;
+        glDeleteProgram( m_nProgramObject );
+        m_nProgramObject = 0;
+    }
+    CHECK_GL_ERROR();
+}
+
+void OGLTransitionImpl::prepare( double, double )
+{
+}
+
+void OGLTransitionImpl::cleanup()
+{
+}
+
+void OGLTransitionImpl::prepareTransition( sal_Int32, sal_Int32, OpenGLContext* )
+{
+}
+
+void OGLTransitionImpl::finishTransition()
+{
+}
+
+void OGLTransitionImpl::displaySlides_( double nTime, sal_Int32 glLeavingSlideTex, sal_Int32 glEnteringSlideTex, double SlideWidthScale, double SlideHeightScale, OpenGLContext * )
+{
+    CHECK_GL_ERROR();
+    applyOverallOperations( nTime, SlideWidthScale, SlideHeightScale );
+
+    glUniform1f( m_nTimeLocation, nTime );
+
+    glActiveTexture( GL_TEXTURE2 );
+    glBindTexture( GL_TEXTURE_2D, glEnteringSlideTex );
+    glActiveTexture( GL_TEXTURE0 );
+
+    displaySlide( nTime, glLeavingSlideTex, getScene().getLeavingSlide(), SlideWidthScale, SlideHeightScale );
+    CHECK_GL_ERROR();
+}
+
+void OGLTransitionImpl::display( double nTime, sal_Int32 glLeavingSlideTex, sal_Int32 glEnteringSlideTex,
+                                 double SlideWidth, double SlideHeight, double DispWidth, double DispHeight, OpenGLContext *pContext )
+{
+    const double SlideWidthScale = SlideWidth/DispWidth;
+    const double SlideHeightScale = SlideHeight/DispHeight;
+
+    CHECK_GL_ERROR();
+    glBindVertexArray(m_nVertexArrayObject);
+    prepare( SlideWidth, SlideHeight );
+
+    CHECK_GL_ERROR();
+    displaySlides_( nTime, glLeavingSlideTex, glEnteringSlideTex, SlideWidthScale, SlideHeightScale, pContext );
+    CHECK_GL_ERROR();
+    displayScene( nTime, SlideWidth, SlideHeight, DispWidth, DispHeight );
+    CHECK_GL_ERROR();
+}
+
+void OGLTransitionImpl::applyOverallOperations( double nTime, double SlideWidthScale, double SlideHeightScale )
+{
+    const Operations_t& rOverallOperations(maScene.getOperations());
+    glm::mat4 matrix;
+    for(size_t i(0); i != rOverallOperations.size(); ++i)
+        rOverallOperations[i]->interpolate(matrix, nTime, SlideWidthScale, SlideHeightScale);
+    CHECK_GL_ERROR();
+    if (m_nOperationsTransformLocation != -1) {
+        glUniformMatrix4fv(m_nOperationsTransformLocation, 1, false, glm::value_ptr(matrix));
+        CHECK_GL_ERROR();
+    }
+}
+
+static void displayPrimitives(const Primitives_t& primitives, GLint primitiveTransformLocation, double nTime, double WidthScale, double HeightScale, std::vector<int>::const_iterator first)
+{
+    for (const Primitive& primitive: primitives)
+        primitive.display(primitiveTransformLocation, nTime, WidthScale, HeightScale, *first++);
+}
+
+void
+OGLTransitionImpl::displaySlide(
+        const double nTime,
+        const sal_Int32 glSlideTex, const Primitives_t& primitives,
+        double SlideWidthScale, double SlideHeightScale )
+{
+    CHECK_GL_ERROR();
+    glBindTexture(GL_TEXTURE_2D, glSlideTex);
+    CHECK_GL_ERROR();
+    if (m_nSceneTransformLocation != -1) {
+        glUniformMatrix4fv(m_nSceneTransformLocation, 1, false, glm::value_ptr(glm::mat4()));
+        CHECK_GL_ERROR();
+    }
+    displayPrimitives(primitives, m_nPrimitiveTransformLocation, nTime, SlideWidthScale, SlideHeightScale, m_nFirstIndices.cbegin());
+    CHECK_GL_ERROR();
+}
+
+void
+OGLTransitionImpl::displayUnbufferedSlide(
+        const double nTime,
+        const sal_Int32 glSlideTex, const Primitives_t& primitives,
+        double SlideWidthScale, double SlideHeightScale )
+{
+    CHECK_GL_ERROR();
+    glBindTexture(GL_TEXTURE_2D, glSlideTex);
+    CHECK_GL_ERROR();
+    glBindVertexArray(0);
+    CHECK_GL_ERROR();
+    glBindBuffer(GL_ARRAY_BUFFER, 0);
+    CHECK_GL_ERROR();
+    if (m_nSceneTransformLocation != -1) {
+        glUniformMatrix4fv(m_nSceneTransformLocation, 1, false, glm::value_ptr(glm::mat4()));
+        CHECK_GL_ERROR();
+    }
+    for (const Primitive& primitive: primitives)
+        primitive.display(m_nPrimitiveTransformLocation, nTime, SlideWidthScale, SlideHeightScale);
+    CHECK_GL_ERROR();
+    glBindVertexArray(m_nVertexArrayObject);
+    CHECK_GL_ERROR();
+    glBindBuffer(GL_ARRAY_BUFFER, m_nVertexBufferObject);
+    CHECK_GL_ERROR();
+}
+
+void OGLTransitionImpl::displayScene( double nTime, double SlideWidth, double SlideHeight, double DispWidth, double DispHeight )
+{
+    const SceneObjects_t& rSceneObjects(maScene.getSceneObjects());
+    CHECK_GL_ERROR();
+    for(size_t i(0); i != rSceneObjects.size(); ++i)
+        rSceneObjects[i]->display(m_nSceneTransformLocation, m_nPrimitiveTransformLocation, nTime, SlideWidth, SlideHeight, DispWidth, DispHeight);
+    CHECK_GL_ERROR();
+}
+
+void Primitive::display(GLint primitiveTransformLocation, double nTime, double WidthScale, double HeightScale) const
+{
+    glm::mat4 matrix;
+    applyOperations( matrix, nTime, WidthScale, HeightScale );
+
+    CHECK_GL_ERROR();
+    if (primitiveTransformLocation != -1) {
+        glUniformMatrix4fv(primitiveTransformLocation, 1, false, glm::value_ptr(matrix));
+        CHECK_GL_ERROR();
+    }
+
+    GLuint nVertexArrayObject;
+    glGenVertexArrays(1, &nVertexArrayObject);
+    CHECK_GL_ERROR();
+    glBindVertexArray(nVertexArrayObject);
+    CHECK_GL_ERROR();
+
+    GLuint nBuffer;
+    glGenBuffers(1, &nBuffer);
+    CHECK_GL_ERROR();
+    glBindBuffer(GL_ARRAY_BUFFER, nBuffer);
+    CHECK_GL_ERROR();
+    glBufferData(GL_ARRAY_BUFFER, getVerticesByteSize(), Vertices.data(), GL_STATIC_DRAW);
+
+    glEnableVertexAttribArray(0);
+    CHECK_GL_ERROR();
+    glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, sizeof(Vertex), nullptr);
+    CHECK_GL_ERROR();
+    glDrawArrays( GL_TRIANGLES, 0, Vertices.size() );
+    CHECK_GL_ERROR();
+
+    glDeleteBuffers(1, &nBuffer);
+    CHECK_GL_ERROR();
+
+    glDeleteVertexArrays(1, &nVertexArrayObject);
+    CHECK_GL_ERROR();
+}
+
+void Primitive::display(GLint primitiveTransformLocation, double nTime, double WidthScale, double HeightScale, int first) const
+{
+    glm::mat4 matrix;
+    applyOperations( matrix, nTime, WidthScale, HeightScale );
+
+    CHECK_GL_ERROR();
+    if (primitiveTransformLocation != -1) {
+        glUniformMatrix4fv(primitiveTransformLocation, 1, false, glm::value_ptr(matrix));
+        CHECK_GL_ERROR();
+    }
+    glDrawArrays( GL_TRIANGLES, first, Vertices.size() );
+
+    CHECK_GL_ERROR();
+}
+
+void Primitive::applyOperations(glm::mat4& matrix, double nTime, double WidthScale, double HeightScale) const
+{
+    for(const auto & rOperation : Operations)
+        rOperation->interpolate(matrix, nTime, WidthScale, HeightScale);
+    matrix = glm::scale(matrix, glm::vec3(WidthScale, HeightScale, 1));
+}
+
+void SceneObject::display(GLint sceneTransformLocation, GLint primitiveTransformLocation, double nTime, double /* SlideWidth */, double /* SlideHeight */, double DispWidth, double DispHeight ) const
+{
+    // fixme: allow various model spaces, now we make it so that
+    // it is regular -1,-1 to 1,1, where the whole display fits in
+    glm::mat4 matrix;
+    if (DispHeight > DispWidth)
+        matrix = glm::scale(matrix, glm::vec3(DispHeight/DispWidth, 1, 1));
+    else
+        matrix = glm::scale(matrix, glm::vec3(1, DispWidth/DispHeight, 1));
+    CHECK_GL_ERROR();
+    if (sceneTransformLocation != -1) {
+        glUniformMatrix4fv(sceneTransformLocation, 1, false, glm::value_ptr(matrix));
+        CHECK_GL_ERROR();
+    }
+    displayPrimitives(maPrimitives, primitiveTransformLocation, nTime, 1, 1, maFirstIndices.cbegin());
+    CHECK_GL_ERROR();
+}
+
+void SceneObject::pushPrimitive(const Primitive &p)
+{
+    maPrimitives.push_back(p);
+}
+
+SceneObject::SceneObject()
+    : maPrimitives()
+{
+}
+
+SceneObject::~SceneObject()
+{
+}
+
+namespace
+{
+
+class Iris : public SceneObject
+{
+public:
+    Iris() = default;
+
+    virtual void prepare(GLuint program) override;
+    virtual void display(GLint sceneTransformLocation, GLint primitiveTransformLocation, double nTime, double SlideWidth, double SlideHeight, double DispWidth, double DispHeight) const override;
+    virtual void finish() override;
+
+private:
+    GLuint maTexture = 0;
+    GLuint maBuffer = 0;
+    GLuint maVertexArray = 0;
+};
+
+void Iris::display(GLint sceneTransformLocation, GLint primitiveTransformLocation, double nTime, double SlideWidth, double SlideHeight, double DispWidth, double DispHeight ) const
+{
+    glBindVertexArray(maVertexArray);
+    CHECK_GL_ERROR();
+    glBindTexture(GL_TEXTURE_2D, maTexture);
+    CHECK_GL_ERROR();
+    SceneObject::display(sceneTransformLocation, primitiveTransformLocation, nTime, SlideWidth, SlideHeight, DispWidth, DispHeight);
+}
+
+void Iris::prepare(GLuint program)
+{
+    CHECK_GL_ERROR();
+    static const GLubyte img[3] = { 80, 80, 80 };
+
+    glGenTextures(1, &maTexture);
+    glBindTexture(GL_TEXTURE_2D, maTexture);
+    glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, 1, 1, 0, GL_RGB, GL_UNSIGNED_BYTE, img);
+    glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_WRAP_S,GL_REPEAT);
+    glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_WRAP_T,GL_REPEAT);
+    glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_MAG_FILTER,GL_NEAREST);
+    glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_MIN_FILTER,GL_NEAREST);
+    CHECK_GL_ERROR();
+
+    glGenVertexArrays(1, &maVertexArray);
+    glBindVertexArray(maVertexArray);
+
+    glGenBuffers(1, &maBuffer);
+    glBindBuffer(GL_ARRAY_BUFFER, maBuffer);
+    maFirstIndices = uploadPrimitives(maPrimitives);
+
+    // Attribute bindings
+    GLint location = glGetAttribLocation(program, "a_position");
+    if (location != -1) {
+        glEnableVertexAttribArray(location);
+        glVertexAttribPointer( location, 3, GL_FLOAT, false, sizeof(Vertex), reinterpret_cast<void*>(offsetof(Vertex, position)) );
+        CHECK_GL_ERROR();
+    }
+
+    location = glGetAttribLocation(program, "a_normal");
+    if (location != -1) {
+        glEnableVertexAttribArray(location);
+        glVertexAttribPointer( location, 3, GL_FLOAT, false, sizeof(Vertex), reinterpret_cast<void*>(offsetof(Vertex, normal)) );
+        CHECK_GL_ERROR();
+    }
+
+    location = glGetAttribLocation(program, "a_texCoord");
+    if (location != -1) {
+        glEnableVertexAttribArray(location);
+        glVertexAttribPointer( location, 2, GL_FLOAT, false, sizeof(Vertex), reinterpret_cast<void*>(offsetof(Vertex, texcoord)) );
+        CHECK_GL_ERROR();
+    }
+
+    glBindBuffer(GL_ARRAY_BUFFER, 0);
+}
+
+void Iris::finish()
+{
+    CHECK_GL_ERROR();
+    glDeleteBuffers(1, &maBuffer);
+    CHECK_GL_ERROR();
+    glDeleteVertexArrays(1, &maVertexArray);
+    CHECK_GL_ERROR();
+    glDeleteTextures(1, &maTexture);
+    CHECK_GL_ERROR();
+}
+
+}
+
+namespace
+{
+
+class ReflectionTransition : public OGLTransitionImpl
+{
+public:
+    ReflectionTransition(const TransitionScene& rScene, const TransitionSettings& rSettings)
+        : OGLTransitionImpl(rScene, rSettings)
+    {}
+
+private:
+    virtual GLuint makeShader() const override;
+    virtual void displaySlides_( double nTime, sal_Int32 glLeavingSlideTex, sal_Int32 glEnteringSlideTex, double SlideWidthScale, double SlideHeightScale, OpenGLContext *pContext ) override;
+
+    virtual void prepareTransition( sal_Int32, sal_Int32, OpenGLContext* ) override {
+        glDisable(GL_CULL_FACE);
+    }
+
+    virtual void finishTransition() override {
+        glEnable(GL_CULL_FACE);
+    }
+};
+
+GLuint ReflectionTransition::makeShader() const
+{
+    return OpenGLHelper::LoadShaders( "reflectionVertexShader", "reflectionFragmentShader" );
+}
+
+void ReflectionTransition::displaySlides_( double nTime, sal_Int32 glLeavingSlideTex, sal_Int32 glEnteringSlideTex,
+                                              double SlideWidthScale, double SlideHeightScale, OpenGLContext * )
+{
+    CHECK_GL_ERROR();
+    applyOverallOperations( nTime, SlideWidthScale, SlideHeightScale );
+
+    sal_Int32 texture;
+    Primitives_t slide;
+    if (nTime < 0.5) {
+        texture = glLeavingSlideTex;
+        slide = getScene().getLeavingSlide();
+    } else {
+        texture = glEnteringSlideTex;
+        slide = getScene().getEnteringSlide();
+    }
+
+    displaySlide( nTime, texture, slide, SlideWidthScale, SlideHeightScale );
+    CHECK_GL_ERROR();
+}
+
+std::shared_ptr<OGLTransitionImpl>
+makeReflectionTransition(
+        Primitives_t&& rLeavingSlidePrimitives,
+        Primitives_t&& rEnteringSlidePrimitives,
+        Operations_t&& rOverallOperations,
+        const TransitionSettings& rSettings)
+{
+    return std::make_shared<ReflectionTransition>(
+            TransitionScene(std::move(rLeavingSlidePrimitives), std::move(rEnteringSlidePrimitives), std::move(rOverallOperations), SceneObjects_t()),
+            rSettings);
+}
+
+}
+
+namespace
+{
+
+class SimpleTransition : public OGLTransitionImpl
+{
+public:
+    SimpleTransition(const TransitionScene& rScene, const TransitionSettings& rSettings)
+        : OGLTransitionImpl(rScene, rSettings)
+    {
+    }
+
+private:
+    virtual GLuint makeShader() const override;
+
+    virtual void displaySlides_( double nTime, sal_Int32 glLeavingSlideTex, sal_Int32 glEnteringSlideTex, double SlideWidthScale, double SlideHeightScale, OpenGLContext *pContext ) override;
+};
+
+GLuint SimpleTransition::makeShader() const
+{
+    return OpenGLHelper::LoadShaders( "basicVertexShader", "basicFragmentShader" );
+}
+
+void SimpleTransition::displaySlides_( double nTime, sal_Int32 glLeavingSlideTex, sal_Int32 glEnteringSlideTex,
+                                       double SlideWidthScale, double SlideHeightScale, OpenGLContext * )
+{
+    CHECK_GL_ERROR();
+    applyOverallOperations( nTime, SlideWidthScale, SlideHeightScale );
+
+    CHECK_GL_ERROR();
+    displaySlide( nTime, glLeavingSlideTex, getScene().getLeavingSlide(), SlideWidthScale, SlideHeightScale );
+    displaySlide( nTime, glEnteringSlideTex, getScene().getEnteringSlide(), SlideWidthScale, SlideHeightScale );
+    CHECK_GL_ERROR();
+}
+
+std::shared_ptr<OGLTransitionImpl>
+makeSimpleTransition(
+        Primitives_t&& rLeavingSlidePrimitives,
+        Primitives_t&& rEnteringSlidePrimitives,
+        Operations_t&& rOverallOperations,
+        SceneObjects_t&& rSceneObjects,
+        const TransitionSettings& rSettings)
+{
+    return std::make_shared<SimpleTransition>(
+            TransitionScene(std::move(rLeavingSlidePrimitives), std::move(rEnteringSlidePrimitives),
+                            std::move(rOverallOperations), std::move(rSceneObjects)),
+            rSettings);
+}
+
+std::shared_ptr<OGLTransitionImpl>
+makeSimpleTransition(
+        Primitives_t&& rLeavingSlidePrimitives,
+        Primitives_t&& rEnteringSlidePrimitives,
+        Operations_t&& rOverallOperations,
+        const TransitionSettings& rSettings = TransitionSettings())
+{
+    return makeSimpleTransition(std::move(rLeavingSlidePrimitives), std::move(rEnteringSlidePrimitives),
+                                std::move(rOverallOperations), SceneObjects_t(), rSettings);
+}
+
+std::shared_ptr<OGLTransitionImpl>
+makeSimpleTransition(
+        Primitives_t&& rLeavingSlidePrimitives,
+        Primitives_t&& rEnteringSlidePrimitives,
+        SceneObjects_t&& rSceneObjects,
+        const TransitionSettings& rSettings)
+{
+    return makeSimpleTransition(std::move(rLeavingSlidePrimitives), std::move(rEnteringSlidePrimitives),
+                                Operations_t(), std::move(rSceneObjects), rSettings);
+}
+
+std::shared_ptr<OGLTransitionImpl>
+makeSimpleTransition(
+        Primitives_t&& rLeavingSlidePrimitives,
+        Primitives_t&& rEnteringSlidePrimitives,
+        const TransitionSettings& rSettings = TransitionSettings())
+{
+    return makeSimpleTransition(std::move(rLeavingSlidePrimitives), std::move(rEnteringSlidePrimitives),
+                                Operations_t(), SceneObjects_t(), rSettings);
+}
+
+}
+
+std::shared_ptr<OGLTransitionImpl> makeOutsideCubeFaceToLeft()
+{
+    Primitive Slide;
+
+    Slide.pushTriangle(glm::vec2(0,0),glm::vec2(1,0),glm::vec2(0,1));
+    Slide.pushTriangle(glm::vec2(1,0),glm::vec2(0,1),glm::vec2(1,1));
+
+    Primitives_t aLeavingPrimitives;
+    aLeavingPrimitives.push_back(Slide);
+
+    Slide.Operations.push_back(makeRotateAndScaleDepthByWidth(glm::vec3(0,1,0),glm::vec3(0,0,-1),90,false,false,0.0,1.0));
+
+    Primitives_t aEnteringPrimitives;
+    aEnteringPrimitives.push_back(Slide);
+
+    Operations_t aOperations;
+    aOperations.push_back(makeRotateAndScaleDepthByWidth(glm::vec3(0,1,0),glm::vec3(0,0,-1),-90,false,true,0.0,1.0));
+
+    return makeSimpleTransition(std::move(aLeavingPrimitives), std::move(aEnteringPrimitives), std::move(aOperations));
+}
+
+std::shared_ptr<OGLTransitionImpl> makeInsideCubeFaceToLeft()
+{
+    Primitive Slide;
+
+    Slide.pushTriangle(glm::vec2(0,0),glm::vec2(1,0),glm::vec2(0,1));
+    Slide.pushTriangle(glm::vec2(1,0),glm::vec2(0,1),glm::vec2(1,1));
+
+    Primitives_t aLeavingPrimitives;
+    aLeavingPrimitives.push_back(Slide);
+
+    Slide.Operations.push_back(makeRotateAndScaleDepthByWidth(glm::vec3(0,1,0),glm::vec3(0,0,1),-90,false,false,0.0,1.0));
+
+    Primitives_t aEnteringPrimitives;
+    aEnteringPrimitives.push_back(Slide);
+
+    Operations_t aOperations;
+    aOperations.push_back(makeRotateAndScaleDepthByWidth(glm::vec3(0,1,0),glm::vec3(0,0,1),90,false,true,0.0,1.0));
+
+    return makeSimpleTransition(std::move(aLeavingPrimitives), std::move(aEnteringPrimitives), std::move(aOperations));
+}
+
+std::shared_ptr<OGLTransitionImpl> makeFallLeaving()
+{
+    Primitive Slide;
+
+    Slide.pushTriangle(glm::vec2(0,0),glm::vec2(1,0),glm::vec2(0,1));
+    Slide.pushTriangle(glm::vec2(1,0),glm::vec2(0,1),glm::vec2(1,1));
+
+    Primitives_t aEnteringPrimitives;
+    aEnteringPrimitives.push_back(Slide);
+
+    Slide.Operations.push_back(makeRotateAndScaleDepthByWidth(glm::vec3(1,0,0),glm::vec3(0,-1,0), 90,true,true,0.0,1.0));
+    Primitives_t aLeavingPrimitives;
+    aLeavingPrimitives.push_back(Slide);
+
+    TransitionSettings aSettings;
+    aSettings.mbUseMipMapEntering = false;
+
+    return makeSimpleTransition(std::move(aLeavingPrimitives), std::move(aEnteringPrimitives), aSettings);
+}
+
+std::shared_ptr<OGLTransitionImpl> makeTurnAround()
+{
+    Primitive Slide;
+    TransitionSettings aSettings;
+
+    Slide.pushTriangle(glm::vec2(0,0),glm::vec2(1,0),glm::vec2(0,1));
+    Slide.pushTriangle(glm::vec2(1,0),glm::vec2(0,1),glm::vec2(1,1));
+    Primitives_t aLeavingPrimitives;
+    aLeavingPrimitives.push_back(Slide);
+
+    Slide.Operations.push_back(makeSScale(glm::vec3(1, -1, 1), glm::vec3(0, -1.02, 0), false, -1, 0));
+    aLeavingPrimitives.push_back(Slide);
+
+    Slide.Operations.clear();
+    Slide.Operations.push_back(makeRotateAndScaleDepthByWidth(glm::vec3(0,1,0),glm::vec3(0,0,0),-180,true,false,0.0,1.0));
+    Primitives_t aEnteringPrimitives;
+    aEnteringPrimitives.push_back(Slide);
+
+    Slide.Operations.push_back(makeSScale(glm::vec3(1, -1, 1), glm::vec3(0, -1.02, 0), false, -1, 0));
+    aEnteringPrimitives.push_back(Slide);
+
+    Operations_t aOperations;
+    aOperations.push_back(makeSTranslate(glm::vec3(0, 0, -1.5),true, 0, 0.5));
+    aOperations.push_back(makeSTranslate(glm::vec3(0, 0, 1.5), true, 0.5, 1));
+    aOperations.push_back(makeRotateAndScaleDepthByWidth(glm::vec3(0, 1, 0),glm::vec3(0, 0, 0), -180, true, true, 0.0, 1.0));
+
+    return makeReflectionTransition(std::move(aLeavingPrimitives), std::move(aEnteringPrimitives), std::move(aOperations), aSettings);
+}
+
+std::shared_ptr<OGLTransitionImpl> makeTurnDown()
+{
+    Primitive Slide;
+
+    Slide.pushTriangle(glm::vec2(0,0),glm::vec2(1,0),glm::vec2(0,1));
+    Slide.pushTriangle(glm::vec2(1,0),glm::vec2(0,1),glm::vec2(1,1));
+    Primitives_t aLeavingPrimitives;
+    aLeavingPrimitives.push_back(Slide);
+
+    Slide.Operations.push_back(makeSTranslate(glm::vec3(0, 0, 0.0001), false, -1.0, 0.0));
+    Slide.Operations.push_back(makeSRotate (glm::vec3(0, 0, 1), glm::vec3(-1, 1, 0), -90, true, 0.0, 1.0));
+    Slide.Operations.push_back(makeSRotate (glm::vec3(0, 0, 1), glm::vec3(-1, 1, 0), 90, false, -1.0, 0.0));
+    Primitives_t aEnteringPrimitives;
+    aEnteringPrimitives.push_back(Slide);
+
+    TransitionSettings aSettings;
+    aSettings.mbUseMipMapLeaving = false;
+
+    return makeSimpleTransition(std::move(aLeavingPrimitives), std::move(aEnteringPrimitives), aSettings);
+}
+
+std::shared_ptr<OGLTransitionImpl> makeIris()
+{
+    Primitive Slide;
+
+    Slide.pushTriangle (glm::vec2 (0,0), glm::vec2 (1,0), glm::vec2 (0,1));
+    Slide.pushTriangle (glm::vec2 (1,0), glm::vec2 (0,1), glm::vec2 (1,1));
+    Primitives_t aEnteringPrimitives;
+    aEnteringPrimitives.push_back (Slide);
+
+    Slide.Operations.push_back (makeSTranslate (glm::vec3 (0, 0,  0.000001), false, -1, 0));
+    Slide.Operations.push_back (makeSTranslate (glm::vec3 (0, 0, -0.000002), false, 0.5, 1));
+    Primitives_t aLeavingPrimitives;
+    aLeavingPrimitives.push_back (Slide);
+
+
+    Primitive irisPart;
+    int i, nSteps = 24, nParts = 7;
+    double t = 1.0/nSteps, lx = 1, ly = 0, of=2.2, f=1.42;
+
+    for (i=1; i<=nSteps; i++) {
+        double x = cos ((3*2*M_PI*t)/nParts);
+        double y = -sin ((3*2*M_PI*t)/nParts);
+        double cx = (f*x + 1)/2;
+        double cy = (f*y + 1)/2;
+        double lcx = (f*lx + 1)/2;
+        double lcy = (f*ly + 1)/2;
+        double cxo = (of*x + 1)/2;
+        double cyo = (of*y + 1)/2;
+        double lcxo = (of*lx + 1)/2;
+        double lcyo = (of*ly + 1)/2;
+        irisPart.pushTriangle (glm::vec2 (lcx, lcy),
+                               glm::vec2 (lcxo, lcyo),
+                               glm::vec2 (cx, cy));
+        irisPart.pushTriangle (glm::vec2 (cx, cy),
+                               glm::vec2 (lcxo, lcyo),
+                               glm::vec2 (cxo, cyo));
+        lx = x;
+        ly = y;
+        t += 1.0/nSteps;
+    }
+
+    std::shared_ptr<Iris> pIris = std::make_shared<Iris>();
+    double angle = 87;
+
+    for (i = 0; i < nParts; i++) {
+        irisPart.Operations.clear ();
+        double rx, ry;
+
+        rx = cos ((2*M_PI*i)/nParts);
+        ry = sin ((2*M_PI*i)/nParts);
+        irisPart.Operations.push_back (makeSRotate (glm::vec3(0, 0, 1), glm::vec3(rx, ry, 0),  angle, true, 0.0, 0.5));
+        irisPart.Operations.push_back (makeSRotate (glm::vec3(0, 0, 1), glm::vec3(rx, ry, 0), -angle, true, 0.5, 1));
+        if (i > 0) {
+            irisPart.Operations.push_back (makeSTranslate (glm::vec3(rx, ry, 0),  false, -1, 0));
+            irisPart.Operations.push_back (makeSRotate (glm::vec3(0, 0, 1), glm::vec3(0, 0, 0), i*360.0/nParts, false, -1, 0));
+            irisPart.Operations.push_back (makeSTranslate (glm::vec3(-1, 0, 0),  false, -1, 0));
+        }
+        irisPart.Operations.push_back(makeSTranslate(glm::vec3(0, 0, 1), false, -2, 0.0));
+        irisPart.Operations.push_back (makeSRotate (glm::vec3(1, .5, 0), glm::vec3(1, 0, 0), -30, false, -1, 0));
+        pIris->pushPrimitive (irisPart);
+    }
+
+    SceneObjects_t aSceneObjects;
+    aSceneObjects.push_back (pIris);
+
+    TransitionSettings aSettings;
+    aSettings.mbUseMipMapLeaving = aSettings.mbUseMipMapEntering = false;
+
+    return makeSimpleTransition(std::move(aLeavingPrimitives), std::move(aEnteringPrimitives), std::move(aSceneObjects), aSettings);
+}
+
+namespace
+{
+
+class RochadeTransition : public ReflectionTransition
+{
+public:
+    RochadeTransition(const TransitionScene& rScene, const TransitionSettings& rSettings)
+        : ReflectionTransition(rScene, rSettings)
+    {}
+
+private:
+    virtual void displaySlides_(double nTime, sal_Int32 glLeavingSlideTex, sal_Int32 glEnteringSlideTex, double SlideWidthScale, double SlideHeightScale, OpenGLContext *pContext) override;
+};
+
+void RochadeTransition::displaySlides_( double nTime, sal_Int32 glLeavingSlideTex, sal_Int32 glEnteringSlideTex, double SlideWidthScale, double SlideHeightScale, OpenGLContext * )
+{
+    applyOverallOperations( nTime, SlideWidthScale, SlideHeightScale );
+
+    if( nTime > .5) {
+        displaySlide( nTime, glLeavingSlideTex, getScene().getLeavingSlide(), SlideWidthScale, SlideHeightScale );
+        displaySlide( nTime, glEnteringSlideTex, getScene().getEnteringSlide(), SlideWidthScale, SlideHeightScale );
+    } else {
+        displaySlide( nTime, glEnteringSlideTex, getScene().getEnteringSlide(), SlideWidthScale, SlideHeightScale );
+        displaySlide( nTime, glLeavingSlideTex, getScene().getLeavingSlide(), SlideWidthScale, SlideHeightScale );
+    }
+}
+
+std::shared_ptr<OGLTransitionImpl>
+makeRochadeTransition(
+        Primitives_t&& rLeavingSlidePrimitives,
+        Primitives_t&& rEnteringSlidePrimitives,
+        const TransitionSettings& rSettings)
+{
+    return std::make_shared<RochadeTransition>(
+            TransitionScene(std::move(rLeavingSlidePrimitives), std::move(rEnteringSlidePrimitives)),
+            rSettings)
+        ;
+
+}
+}
+
+std::shared_ptr<OGLTransitionImpl> makeRochade()
+{
+    Primitive Slide;
+    TransitionSettings aSettings;
+
+    double w, h;
+
+    w = 2.2;
+    h = 10;
+
+    Slide.pushTriangle(glm::vec2(0,0),glm::vec2(1,0),glm::vec2(0,1));
+    Slide.pushTriangle(glm::vec2(1,0),glm::vec2(0,1),glm::vec2(1,1));
+
+    Slide.Operations.push_back(makeSEllipseTranslate(w, h, 0.25, -0.25, true, 0, 1));
+    Slide.Operations.push_back(makeRotateAndScaleDepthByWidth(glm::vec3(0,1,0),glm::vec3(0,0,0), -45, true, true, 0, 1));
+    Primitives_t aLeavingSlide;
+    aLeavingSlide.push_back(Slide);
+
+    Slide.Operations.push_back(makeSScale(glm::vec3(1, -1, 1), glm::vec3(0, -1.02, 0), false, -1, 0));
+    aLeavingSlide.push_back(Slide);
+
+    Slide.Operations.clear();
+    Slide.Operations.push_back(makeSEllipseTranslate(w, h, 0.75, 0.25, true, 0, 1));
+    Slide.Operations.push_back(makeSTranslate(glm::vec3(0, 0, -h), false, -1, 0));
+    Slide.Operations.push_back(makeRotateAndScaleDepthByWidth(glm::vec3(0,1,0),glm::vec3(0,0,0), -45, true, true, 0, 1));
+    Slide.Operations.push_back(makeRotateAndScaleDepthByWidth(glm::vec3(0,1,0),glm::vec3(0,0,0), 45, true, false, -1, 0));
+    Primitives_t aEnteringSlide;
+    aEnteringSlide.push_back(Slide);
+
+    Slide.Operations.push_back(makeSScale(glm::vec3(1, -1, 1), glm::vec3(0, -1.02, 0), false, -1, 0));
+    aEnteringSlide.push_back(Slide);
+
+    return makeRochadeTransition(std::move(aLeavingSlide), std::move(aEnteringSlide), aSettings);
+}
+
+static double randFromNeg1to1()
+{
+    return comphelper::rng::uniform_real_distribution(-1.0, std::nextafter(1.0, DBL_MAX));
+}
+
+// TODO(Q3): extract to basegfx
+static glm::vec3 randNormVectorInXYPlane()
+{
+    glm::vec3 toReturn(randFromNeg1to1(),randFromNeg1to1(),0.0);
+    return glm::normalize(toReturn);
+}
+
+template<typename T>
+static T clamp(const T& rIn)
+{
+    return glm::clamp(rIn, T(-1.0), T(1.0));
+}
+
+std::shared_ptr<OGLTransitionImpl> makeRevolvingCircles( sal_uInt16 nCircles , sal_uInt16 nPointsOnCircles )
+{
+    double dAngle(2*M_PI/static_cast<double>( nPointsOnCircles ));
+    if(nCircles < 2 || nPointsOnCircles < 4)
+        return makeNByMTileFlip(1,1);
+    float Radius(1.0/static_cast<double>( nCircles ));
+    float dRadius(Radius);
+    float LastRadius(0.0);
+    float NextRadius(2*Radius);
+
+    /// now we know there is at least two circles
+    /// the first will always be a full circle
+    /// the last will always be the outer shell of the slide with a circle hole
+
+    //add the full circle
+    std::vector<glm::vec2> unScaledTexCoords;
+    float TempAngle(0.0);
+    for(unsigned int Point(0); Point < nPointsOnCircles; ++Point)
+    {
+        unScaledTexCoords.emplace_back( cos(TempAngle - M_PI_2) , sin(TempAngle- M_PI_2) );
+
+        TempAngle += dAngle;
+    }
+
+    Primitives_t aLeavingSlide;
+    Primitives_t aEnteringSlide;
+    {
+        Primitive EnteringSlide;
+        Primitive LeavingSlide;
+        for(int Point(0); Point + 1 < nPointsOnCircles; ++Point)
+        {
+            EnteringSlide.pushTriangle( glm::vec2( 0.5 , 0.5 ) , Radius * unScaledTexCoords[ Point + 1 ] / 2.0f + glm::vec2( 0.5 , 0.5 ) , Radius * unScaledTexCoords[ Point ] / 2.0f + glm::vec2( 0.5 , 0.5 ) );
+            LeavingSlide.pushTriangle( glm::vec2( 0.5 , 0.5 ) , Radius * unScaledTexCoords[ Point + 1 ] / 2.0f + glm::vec2( 0.5 , 0.5 ) , Radius * unScaledTexCoords[ Point ] / 2.0f + glm::vec2( 0.5, 0.5) );
+        }
+        EnteringSlide.pushTriangle( glm::vec2(0.5,0.5) , Radius * unScaledTexCoords[ 0 ] / 2.0f + glm::vec2( 0.5 , 0.5 ) , Radius * unScaledTexCoords[ nPointsOnCircles - 1 ] / 2.0f + glm::vec2( 0.5 , 0.5 ) );
+        LeavingSlide.pushTriangle( glm::vec2(0.5,0.5) , Radius*unScaledTexCoords[0]/2.0f + glm::vec2(0.5,0.5) , Radius*unScaledTexCoords[nPointsOnCircles - 1]/2.0f + glm::vec2(0.5,0.5) );
+
+        glm::vec3 axis(randNormVectorInXYPlane());
+        EnteringSlide.Operations.push_back( makeSRotate( axis , glm::vec3(0,0,0) , 180, true, Radius/2.0 , (NextRadius + 1)/2.0 ) );
+        LeavingSlide.Operations.push_back( makeSRotate( axis , glm::vec3(0,0,0) , 180, true, Radius/2.0 , (NextRadius + 1)/2.0 ) );
+        EnteringSlide.Operations.push_back( makeSRotate( axis , glm::vec3(0,0,0) , -180, false,0.0,1.0) );
+
+        aEnteringSlide.push_back(EnteringSlide);
+        aLeavingSlide.push_back(LeavingSlide);
+        LastRadius = Radius;
+        Radius = NextRadius;
+        NextRadius += dRadius;
+    }
+
+    for(int i(1); i < nCircles - 1; ++i)
+    {
+        Primitive LeavingSlide;
+        Primitive EnteringSlide;
+        for(int Side(0); Side < nPointsOnCircles - 1; ++Side)
+        {
+            EnteringSlide.pushTriangle(Radius*unScaledTexCoords[Side]/2.0f + glm::vec2(0.5,0.5) , LastRadius*unScaledTexCoords[Side]/2.0f + glm::vec2(0.5,0.5) , LastRadius*unScaledTexCoords[Side + 1]/2.0f + glm::vec2(0.5,0.5) );
+            EnteringSlide.pushTriangle(Radius*unScaledTexCoords[Side]/2.0f + glm::vec2(0.5,0.5) , LastRadius*unScaledTexCoords[Side + 1]/2.0f + glm::vec2(0.5,0.5) , Radius*unScaledTexCoords[Side + 1]/2.0f + glm::vec2(0.5,0.5) );
+
+            LeavingSlide.pushTriangle(Radius*unScaledTexCoords[Side]/2.0f + glm::vec2(0.5,0.5) , LastRadius*unScaledTexCoords[Side]/2.0f + glm::vec2(0.5,0.5) , LastRadius*unScaledTexCoords[Side + 1]/2.0f + glm::vec2(0.5,0.5) );
+            LeavingSlide.pushTriangle(Radius*unScaledTexCoords[Side]/2.0f + glm::vec2(0.5,0.5) , LastRadius*unScaledTexCoords[Side + 1]/2.0f + glm::vec2(0.5,0.5) , Radius*unScaledTexCoords[Side + 1]/2.0f + glm::vec2(0.5,0.5) );
+        }
+
+        EnteringSlide.pushTriangle(Radius*unScaledTexCoords[nPointsOnCircles - 1]/2.0f + glm::vec2(0.5,0.5) , LastRadius*unScaledTexCoords[nPointsOnCircles - 1]/2.0f + glm::vec2(0.5,0.5) , LastRadius*unScaledTexCoords[0]/2.0f + glm::vec2(0.5,0.5) );
+        EnteringSlide.pushTriangle(Radius*unScaledTexCoords[nPointsOnCircles - 1]/2.0f + glm::vec2(0.5,0.5) , LastRadius*unScaledTexCoords[0]/2.0f + glm::vec2(0.5,0.5) , Radius*unScaledTexCoords[0]/2.0f + glm::vec2(0.5,0.5) );
+
+        LeavingSlide.pushTriangle(Radius*unScaledTexCoords[nPointsOnCircles - 1]/2.0f + glm::vec2(0.5,0.5) , LastRadius*unScaledTexCoords[nPointsOnCircles - 1]/2.0f + glm::vec2(0.5,0.5) , LastRadius*unScaledTexCoords[0]/2.0f + glm::vec2(0.5,0.5) );
+        LeavingSlide.pushTriangle(Radius*unScaledTexCoords[nPointsOnCircles - 1]/2.0f + glm::vec2(0.5,0.5) , LastRadius*unScaledTexCoords[0]/2.0f + glm::vec2(0.5,0.5) , Radius*unScaledTexCoords[0]/2.0f + glm::vec2(0.5,0.5) );
+
+        glm::vec3 axis(randNormVectorInXYPlane());
+        EnteringSlide.Operations.push_back( makeSRotate( axis , glm::vec3(0,0,0) , 180, true, Radius/2.0 , (NextRadius + 1)/2.0 ) );
+        LeavingSlide.Operations.push_back( makeSRotate( axis , glm::vec3(0,0,0) , 180, true, Radius/2.0 , (NextRadius + 1)/2.0 ) );
+        EnteringSlide.Operations.push_back( makeSRotate( axis , glm::vec3(0,0,0) , -180, false,0.0,1.0) );
+
+        aEnteringSlide.push_back(EnteringSlide);
+        aLeavingSlide.push_back(LeavingSlide);
+
+        LastRadius = Radius;
+        Radius = NextRadius;
+        NextRadius += dRadius;
+    }
+    {
+        Radius = sqrt(2.0);
+        Primitive LeavingSlide;
+        Primitive EnteringSlide;
+        for(int Side(0); Side < nPointsOnCircles - 1; ++Side)
+        {
+
+            EnteringSlide.pushTriangle(clamp(Radius*unScaledTexCoords[Side])/2.0f + glm::vec2(0.5,0.5) , LastRadius*unScaledTexCoords[Side]/2.0f + glm::vec2(0.5,0.5) , LastRadius*unScaledTexCoords[Side + 1]/2.0f + glm::vec2(0.5,0.5) );
+            EnteringSlide.pushTriangle(clamp(Radius*unScaledTexCoords[Side])/2.0f + glm::vec2(0.5,0.5) , LastRadius*unScaledTexCoords[Side + 1]/2.0f + glm::vec2(0.5,0.5) , clamp(Radius*unScaledTexCoords[Side + 1])/2.0f + glm::vec2(0.5,0.5) );
+
+            LeavingSlide.pushTriangle(clamp(Radius*unScaledTexCoords[Side])/2.0f + glm::vec2(0.5,0.5) , LastRadius*unScaledTexCoords[Side]/2.0f + glm::vec2(0.5,0.5) , LastRadius*unScaledTexCoords[Side + 1]/2.0f + glm::vec2(0.5,0.5) );
+            LeavingSlide.pushTriangle(clamp(Radius*unScaledTexCoords[Side])/2.0f + glm::vec2(0.5,0.5) , LastRadius*unScaledTexCoords[Side + 1]/2.0f + glm::vec2(0.5,0.5) , clamp(Radius*unScaledTexCoords[Side + 1])/2.0f + glm::vec2(0.5,0.5) );
+        }
+
+        EnteringSlide.pushTriangle(clamp(Radius*unScaledTexCoords[nPointsOnCircles - 1])/2.0f + glm::vec2(0.5,0.5) , LastRadius*unScaledTexCoords[nPointsOnCircles - 1]/2.0f + glm::vec2(0.5,0.5) , LastRadius*unScaledTexCoords[0]/2.0f + glm::vec2(0.5,0.5) );
+        EnteringSlide.pushTriangle(clamp(Radius*unScaledTexCoords[nPointsOnCircles - 1])/2.0f + glm::vec2(0.5,0.5) , LastRadius*unScaledTexCoords[0]/2.0f + glm::vec2(0.5,0.5) , clamp(Radius*unScaledTexCoords[0])/2.0f + glm::vec2(0.5,0.5) );
+
+        LeavingSlide.pushTriangle(clamp(Radius*unScaledTexCoords[nPointsOnCircles - 1])/2.0f + glm::vec2(0.5,0.5) , LastRadius*unScaledTexCoords[nPointsOnCircles - 1]/2.0f + glm::vec2(0.5,0.5) , LastRadius*unScaledTexCoords[0]/2.0f + glm::vec2(0.5,0.5) );
+        LeavingSlide.pushTriangle(clamp(Radius*unScaledTexCoords[nPointsOnCircles - 1])/2.0f + glm::vec2(0.5,0.5) , LastRadius*unScaledTexCoords[0]/2.0f + glm::vec2(0.5,0.5) , clamp(Radius*unScaledTexCoords[0])/2.0f + glm::vec2(0.5,0.5) );
+
+        glm::vec3 axis(randNormVectorInXYPlane());
+        EnteringSlide.Operations.push_back( makeSRotate( axis , glm::vec3(0,0,0) , 180, true, (LastRadius + dRadius)/2.0 , 1.0 ) );
+        LeavingSlide.Operations.push_back( makeSRotate( axis , glm::vec3(0,0,0) , 180, true, (LastRadius + dRadius)/2.0 , 1.0 ) );
+        EnteringSlide.Operations.push_back( makeSRotate( axis , glm::vec3(0,0,0) , -180, false,0.0,1.0) );
+
+        aEnteringSlide.push_back(EnteringSlide);
+        aLeavingSlide.push_back(LeavingSlide);
+    }
+
+    return makeSimpleTransition(std::move(aLeavingSlide), std::move(aEnteringSlide));
+}
+
+std::shared_ptr<OGLTransitionImpl> makeHelix( sal_uInt16 nRows )
+{
+    double invN(1.0/static_cast<double>(nRows));
+    double iDn = 0.0;
+    double iPDn = invN;
+    Primitives_t aLeavingSlide;
+    Primitives_t aEnteringSlide;
+    for(unsigned int i(0); i < nRows; ++i)
+    {
+        Primitive Tile;
+
+        Tile.pushTriangle(glm::vec2( 1.0 , iDn ) , glm::vec2( 0.0 , iDn ) , glm::vec2( 0.0 , iPDn ));
+
+        Tile.pushTriangle(glm::vec2( 1.0 , iPDn ) , glm::vec2( 1.0 , iDn ) , glm::vec2( 0.0 , iPDn ));
+
+        Tile.Operations.push_back( makeSRotate( glm::vec3( 0 , 1 , 0 ) , ( Tile.getVertex(1) + Tile.getVertex(3) )/2.0f , 180 ,
+                                                true, std::min(std::max(static_cast<double>(i - nRows/2.0)*invN/2.0,0.0),1.0),
+                                                std::min(std::max(static_cast<double>(i + nRows/2.0)*invN/2.0,0.0),1.0) ) );
+
+        aLeavingSlide.push_back(Tile);
+
+        Tile.Operations.push_back( makeSRotate( glm::vec3( 0 , 1 , 0 ) , ( Tile.getVertex(1) + Tile.getVertex(3) )/2.0f , -180 , false,0.0,1.0) );
+
+        aEnteringSlide.push_back(Tile);
+
+        iDn += invN;
+        iPDn += invN;
+    }
+
+    return makeSimpleTransition(std::move(aLeavingSlide), std::move(aEnteringSlide));
+}
+
+static float fdiv(int a, int b)
+{
+    return static_cast<float>(a)/b;
+}
+
+static glm::vec2 vec(float x, float y, float nx, float ny)
+{
+    x = x < 0.0 ? 0.0 : x;
+    x = std::min(x, nx);
+    y = y < 0.0 ? 0.0 : y;
+    y = std::min(y, ny);
+    return glm::vec2(fdiv(x, nx), fdiv(y, ny));
+}
+
+std::shared_ptr<OGLTransitionImpl> makeNByMTileFlip( sal_uInt16 n, sal_uInt16 m )
+{
+    Primitives_t aLeavingSlide;
+    Primitives_t aEnteringSlide;
+
+    for (int x = 0; x < n; x++)
+    {
+        for (int y = 0; y < n; y++)
+        {
+            Primitive aTile;
+            glm::vec2 x11 = vec(x,   y,   n, m);
+            glm::vec2 x12 = vec(x,   y+1, n, m);
+            glm::vec2 x21 = vec(x+1, y,   n, m);
+            glm::vec2 x22 = vec(x+1, y+1, n, m);
+
+            aTile.pushTriangle(x21, x11, x12);
+            aTile.pushTriangle(x22, x21, x12);
+
+            aTile.Operations.push_back(makeSRotate( glm::vec3(0 , 1, 0), (aTile.getVertex(1) + aTile.getVertex(3)) / 2.0f, 180 , true, x11.x * x11.y / 2.0f , ((x22.x * x22.y) + 1.0f) / 2.0f));
+            aLeavingSlide.push_back(aTile);
+
+            aTile.Operations.push_back(makeSRotate( glm::vec3(0 , 1, 0), (aTile.getVertex(1) + aTile.getVertex(3)) / 2.0f, -180, false, x11.x * x11.y / 2.0f , ((x22.x * x22.y) + 1.0f) / 2.0f));
+            aEnteringSlide.push_back(aTile);
+        }
+    }
+
+    return makeSimpleTransition(std::move(aLeavingSlide), std::move(aEnteringSlide));
+}
+
+Primitive& Primitive::operator=(const Primitive& rvalue)
+{
+    Primitive aTmp(rvalue);
+    swap(aTmp);
+    return *this;
+}
+
+Primitive::Primitive(const Primitive& rvalue)
+    : Operations(rvalue.Operations)
+    , Vertices(rvalue.Vertices)
+{
+}
+
+void Primitive::swap(Primitive& rOther)
+{
+    using std::swap;
+
+    swap(Operations, rOther.Operations);
+    swap(Vertices, rOther.Vertices);
+}
+
+void Primitive::pushTriangle(const glm::vec2& SlideLocation0,const glm::vec2& SlideLocation1,const glm::vec2& SlideLocation2)
+{
+    std::vector<glm::vec3> Verts;
+    std::vector<glm::vec2> Texs;
+    Verts.reserve(3);
+    Texs.reserve(3);
+
+    Verts.emplace_back( 2*SlideLocation0.x - 1, -2*SlideLocation0.y + 1 , 0.0 );
+    Verts.emplace_back( 2*SlideLocation1.x - 1, -2*SlideLocation1.y + 1 , 0.0 );
+    Verts.emplace_back( 2*SlideLocation2.x - 1, -2*SlideLocation2.y + 1 , 0.0 );
+
+    //figure out if they're facing the correct way, and make them face the correct way.
+    glm::vec3 Normal( glm::cross( Verts[0] - Verts[1] , Verts[1] - Verts[2] ) );
+    if(Normal.z >= 0.0)//if the normal is facing us
+    {
+        Texs.push_back(SlideLocation0);
+        Texs.push_back(SlideLocation1);
+        Texs.push_back(SlideLocation2);
+    }
+    else // if the normal is facing away from us, make it face us
+    {
+        Texs.push_back(SlideLocation0);
+        Texs.push_back(SlideLocation2);
+        Texs.push_back(SlideLocation1);
+        Verts.clear();
+        Verts.emplace_back( 2*SlideLocation0.x - 1, -2*SlideLocation0.y + 1 , 0.0 );
+        Verts.emplace_back( 2*SlideLocation2.x - 1, -2*SlideLocation2.y + 1 , 0.0 );
+        Verts.emplace_back( 2*SlideLocation1.x - 1, -2*SlideLocation1.y + 1 , 0.0 );
+    }
+
+    Vertices.push_back({Verts[0], glm::vec3(0, 0, 1), Texs[0]}); //all normals always face the screen when untransformed.
+    Vertices.push_back({Verts[1], glm::vec3(0, 0, 1), Texs[1]}); //all normals always face the screen when untransformed.
+    Vertices.push_back({Verts[2], glm::vec3(0, 0, 1), Texs[2]}); //all normals always face the screen when untransformed.
+}
+
+namespace
+{
+
+class DiamondTransition : public SimpleTransition
+{
+public:
+    DiamondTransition(const TransitionScene& rScene, const TransitionSettings& rSettings)
+        : SimpleTransition(rScene, rSettings)
+        {}
+
+private:
+    virtual void displaySlides_( double nTime, sal_Int32 glLeavingSlideTex, sal_Int32 glEnteringSlideTex, double SlideWidthScale, double SlideHeightScale, OpenGLContext *pContext ) override;
+};
+
+Primitives_t makeLeavingSlide(double nTime)
+{
+    Primitive Slide2;
+    if( nTime >= 0.5 ) {
+        double m = 1 - nTime;
+
+        Slide2.pushTriangle (glm::vec2 (0,0), glm::vec2 (m,0), glm::vec2 (0,m));
+        Slide2.pushTriangle (glm::vec2 (nTime,0), glm::vec2 (1,0), glm::vec2 (1,m));
+        Slide2.pushTriangle (glm::vec2 (1,nTime), glm::vec2 (1,1), glm::vec2 (nTime,1));
+        Slide2.pushTriangle (glm::vec2 (0,nTime), glm::vec2 (m,1), glm::vec2 (0,1));
+    } else {
+        double l = 0.5 - nTime;
+        double h = 0.5 + nTime;
+
+        Slide2.pushTriangle (glm::vec2 (0,0), glm::vec2 (1,0), glm::vec2 (0.5,l));
+        Slide2.pushTriangle (glm::vec2 (0.5,l), glm::vec2 (1,0), glm::vec2 (h,0.5));
+        Slide2.pushTriangle (glm::vec2 (1,0), glm::vec2 (1,1), glm::vec2 (h,0.5));
+        Slide2.pushTriangle (glm::vec2 (h,0.5), glm::vec2 (1,1), glm::vec2 (0.5,h));
+        Slide2.pushTriangle (glm::vec2 (0.5,h), glm::vec2 (1,1), glm::vec2 (0,1));
+        Slide2.pushTriangle (glm::vec2 (l,0.5), glm::vec2 (0.5,h), glm::vec2 (0,1));
+        Slide2.pushTriangle (glm::vec2 (0,0), glm::vec2 (l,0.5), glm::vec2 (0,1));
+        Slide2.pushTriangle (glm::vec2 (0,0), glm::vec2 (0.5,l), glm::vec2 (l,0.5));
+    }
+    Slide2.Operations.push_back (makeSTranslate (glm::vec3 (0, 0, 0.00000001), false, -1, 0));
+    Primitives_t aLeavingSlidePrimitives;
+    aLeavingSlidePrimitives.push_back (Slide2);
+
+    return aLeavingSlidePrimitives;
+}
+
+void DiamondTransition::displaySlides_( double nTime, sal_Int32 glLeavingSlideTex, sal_Int32 glEnteringSlideTex,
+                                        double SlideWidthScale, double SlideHeightScale, OpenGLContext * )
+{
+    CHECK_GL_ERROR();
+    applyOverallOperations( nTime, SlideWidthScale, SlideHeightScale );
+
+    CHECK_GL_ERROR();
+    displayUnbufferedSlide( nTime, glLeavingSlideTex, makeLeavingSlide(nTime), SlideWidthScale, SlideHeightScale );
+    displaySlide( nTime, glEnteringSlideTex, getScene().getEnteringSlide(), SlideWidthScale, SlideHeightScale );
+    CHECK_GL_ERROR();
+}
+
+std::shared_ptr<OGLTransitionImpl>
+makeDiamondTransition(const TransitionSettings& rSettings)
+{
+    Primitive Slide1;
+    Slide1.pushTriangle (glm::vec2 (0,0), glm::vec2 (1,0), glm::vec2 (0,1));
+    Slide1.pushTriangle (glm::vec2 (1,0), glm::vec2 (0,1), glm::vec2 (1,1));
+    Primitives_t aEnteringSlidePrimitives;
+    aEnteringSlidePrimitives.push_back (Slide1);
+    Primitives_t aLeavingSlidePrimitives;
+    aLeavingSlidePrimitives.push_back (Slide1);
+    return std::make_shared<DiamondTransition>(TransitionScene(std::move(aLeavingSlidePrimitives), std::move(aEnteringSlidePrimitives)), rSettings);
+}
+
+}
+
+std::shared_ptr<OGLTransitionImpl> makeDiamond()
+{
+    TransitionSettings aSettings;
+    aSettings.mbUseMipMapLeaving = aSettings.mbUseMipMapEntering = false;
+
+    return makeDiamondTransition(aSettings);
+}
+
+std::shared_ptr<OGLTransitionImpl> makeVenetianBlinds( bool vertical, int parts )
+{
+    static double t30 = tan( M_PI/6.0 );
+    double ln = 0;
+    double p = 1.0/parts;
+
+    Primitives_t aLeavingSlide;
+    Primitives_t aEnteringSlide;
+    for( int i=0; i<parts; i++ ) {
+        Primitive Slide;
+        double n = (i + 1)/static_cast<double>(parts);
+        if( vertical ) {
+            Slide.pushTriangle (glm::vec2 (ln,0), glm::vec2 (n,0), glm::vec2 (ln,1));
+            Slide.pushTriangle (glm::vec2 (n,0), glm::vec2 (ln,1), glm::vec2 (n,1));
+            Slide.Operations.push_back(makeRotateAndScaleDepthByWidth(glm::vec3(0, 1, 0), glm::vec3(n + ln - 1, 0, -t30*p), -120, true, true, 0.0, 1.0));
+        } else {
+            Slide.pushTriangle (glm::vec2 (0,ln), glm::vec2 (1,ln), glm::vec2 (0,n));
+            Slide.pushTriangle (glm::vec2 (1,ln), glm::vec2 (0,n), glm::vec2 (1,n));
+            Slide.Operations.push_back(makeRotateAndScaleDepthByHeight(glm::vec3(1, 0, 0), glm::vec3(0, 1 - n - ln, -t30*p), -120, true, true, 0.0, 1.0));
+        }
+        aLeavingSlide.push_back (Slide);
+
+        if( vertical ) {
+            Slide.Operations.push_back(makeSRotate(glm::vec3(0, 1, 0), glm::vec3(2*n - 1, 0, 0), -60, false, -1, 0));
+            Slide.Operations.push_back(makeSRotate(glm::vec3(0, 1, 0), glm::vec3(n + ln - 1, 0, 0), 180, false, -1, 0));
+        } else {
+            Slide.Operations.push_back(makeSRotate(glm::vec3(1, 0, 0), glm::vec3(0, 1 - 2*n, 0), -60, false, -1, 0));
+            Slide.Operations.push_back(makeSRotate(glm::vec3(1, 0, 0), glm::vec3(0, 1 - n - ln, 0), 180, false, -1, 0));
+        }
+        aEnteringSlide.push_back (Slide);
+        ln = n;
+    }
+
+    return makeSimpleTransition(std::move(aLeavingSlide), std::move(aEnteringSlide));
+}
+
+namespace
+{
+
+class FadeSmoothlyTransition : public OGLTransitionImpl
+{
+public:
+    FadeSmoothlyTransition(const TransitionScene& rScene, const TransitionSettings& rSettings)
+        : OGLTransitionImpl(rScene, rSettings)
+    {}
+
+private:
+    virtual GLuint makeShader() const override;
+};
+
+GLuint FadeSmoothlyTransition::makeShader() const
+{
+    return OpenGLHelper::LoadShaders( "basicVertexShader", "fadeFragmentShader" );
+}
+
+std::shared_ptr<OGLTransitionImpl>
+makeFadeSmoothlyTransition(
+        Primitives_t&& rLeavingSlidePrimitives,
+        Primitives_t&& rEnteringSlidePrimitives,
+        const TransitionSettings& rSettings)
+{
+    return std::make_shared<FadeSmoothlyTransition>(
+            TransitionScene(std::move(rLeavingSlidePrimitives), std::move(rEnteringSlidePrimitives)),
+            rSettings)
+        ;
+}
+
+}
+
+std::shared_ptr<OGLTransitionImpl> makeFadeSmoothly()
+{
+    Primitive Slide;
+
+    Slide.pushTriangle (glm::vec2 (0,0), glm::vec2 (1,0), glm::vec2 (0,1));
+    Slide.pushTriangle (glm::vec2 (1,0), glm::vec2 (0,1), glm::vec2 (1,1));
+    Primitives_t aLeavingSlide;
+    aLeavingSlide.push_back (Slide);
+    Primitives_t aEnteringSlide;
+    aEnteringSlide.push_back (Slide);
+
+    TransitionSettings aSettings;
+    aSettings.mbUseMipMapLeaving = aSettings.mbUseMipMapEntering = false;
+
+    return makeFadeSmoothlyTransition(std::move(aLeavingSlide), std::move(aEnteringSlide), aSettings);
+}
+
+namespace
+{
+
+class FadeThroughColorTransition : public OGLTransitionImpl
+{
+public:
+    FadeThroughColorTransition(const TransitionScene& rScene, const TransitionSettings& rSettings, bool white)
+        : OGLTransitionImpl(rScene, rSettings), useWhite( white )
+    {}
+
+private:
+    virtual GLuint makeShader() const override;
+    bool useWhite;
+};
+
+GLuint FadeThroughColorTransition::makeShader() const
+{
+    return OpenGLHelper::LoadShaders( "basicVertexShader", "fadeBlackFragmentShader",
+        useWhite ? "#define use_white" : "", "" );
+}
+
+std::shared_ptr<OGLTransitionImpl>
+makeFadeThroughColorTransition(
+        Primitives_t&& rLeavingSlidePrimitives,
+        Primitives_t&& rEnteringSlidePrimitives,
+        const TransitionSettings& rSettings,
+        bool white)
+{
+    return std::make_shared<FadeThroughColorTransition>(
+            TransitionScene(std::move(rLeavingSlidePrimitives), std::move(rEnteringSlidePrimitives)),
+            rSettings, white)
+        ;
+}
+
+}
+
+std::shared_ptr<OGLTransitionImpl> makeFadeThroughColor( bool white )
+{
+    Primitive Slide;
+
+    Slide.pushTriangle (glm::vec2 (0,0), glm::vec2 (1,0), glm::vec2 (0,1));
+    Slide.pushTriangle (glm::vec2 (1,0), glm::vec2 (0,1), glm::vec2 (1,1));
+    Primitives_t aLeavingSlide;
+    aLeavingSlide.push_back (Slide);
+    Primitives_t aEnteringSlide;
+    aEnteringSlide.push_back (Slide);
+
+    TransitionSettings aSettings;
+    aSettings.mbUseMipMapLeaving = aSettings.mbUseMipMapEntering = false;
+
+    return makeFadeThroughColorTransition(std::move(aLeavingSlide), std::move(aEnteringSlide), aSettings, white);
+}
+
+namespace
+{
+
+class PermTextureTransition : public OGLTransitionImpl
+{
+protected:
+    PermTextureTransition(const TransitionScene& rScene, const TransitionSettings& rSettings)
+        : OGLTransitionImpl(rScene, rSettings)
+        , m_nHelperTexture(0)
+    {}
+
+    virtual void finishTransition() override;
+    virtual void prepareTransition( sal_Int32 glLeavingSlideTex, sal_Int32 glEnteringSlideTex, OpenGLContext *pContext ) override;
+
+private:
+    /** various data */
+    GLuint m_nHelperTexture;
+};
+
+void PermTextureTransition::finishTransition()
+{
+    CHECK_GL_ERROR();
+    if ( m_nHelperTexture )
+    {
+        glDeleteTextures( 1, &m_nHelperTexture );
+        m_nHelperTexture = 0;
+    }
+    CHECK_GL_ERROR();
+}
+
+constexpr auto permutation2D = []() constexpr {
+    int permutation256 [256]= {
+    215, 100, 200, 204, 233,  50,  85, 196,
+     71, 141, 122, 160,  93, 131, 243, 234,
+    162, 183,  36, 155,   4,  62,  35, 205,
+     40, 102,  33,  27, 255,  55, 214, 156,
+     75, 163, 134, 126, 249,  74, 197, 228,
+     72,  90, 206, 235,  17,  22,  49, 169,
+    227,  89,  16,   5, 117,  60, 248, 230,
+    217,  68, 138,  96, 194, 170, 136,  10,
+    112, 238, 184, 189, 176,  42, 225, 212,
+     84,  58, 175, 244, 150, 168, 219, 236,
+    101, 208, 123,  37, 164, 110, 158, 201,
+     78, 114,  57,  48,  70, 142, 106,  43,
+    232,  26,  32, 252, 239,  98, 191,  94,
+     59, 149,  39, 187, 203, 190,  19,  13,
+    133,  45,  61, 247,  23,  34,  20,  52,
+    118, 209, 146, 193, 222,  18,   1, 152,
+     46,  41,  91, 148, 115,  25, 135,  77,
+    254, 147, 224, 161,   9, 213, 223, 250,
+    231, 251, 127, 166,  63, 179,  81, 130,
+    139,  28, 120, 151, 241,  86, 111,   0,
+     88, 153, 172, 182, 159, 105, 178,  47,
+     51, 167,  65,  66,  92,  73, 198, 211,
+    245, 195,  31, 220, 140,  76, 221, 186,
+    154, 185,  56,  83,  38, 165, 109,  67,
+    124, 226, 132,  53, 229,  29,  12, 181,
+    121,  24, 207, 199, 177, 113,  30,  80,
+      3,  97, 188,  79, 216, 173,   8, 145,
+     87, 128, 180, 237, 240, 137, 125, 104,
+     15, 242, 119, 246, 103, 143,  95, 144,
+      2,  44,  69, 157, 192, 174,  14,  54,
+    218,  82,  64, 210,  11,   6, 129,  21,
+    116, 171,  99, 202,   7, 107, 253, 108
+    };
+    std::array<unsigned char, 256 * 256> a{};
+    for (int y = 0; y < 256; y++)
+        for (int x = 0; x < 256; x++)
+            a[x + y * 256] = permutation256[(y + permutation256[x]) & 0xff];
+    return a;
+}();
+
+void initPermTexture(GLuint *texID)
+{
+    CHECK_GL_ERROR();
+    glGenTextures(1, texID);
+    glBindTexture(GL_TEXTURE_2D, *texID);
+    glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, 256, 256, 0, GL_RED, GL_UNSIGNED_BYTE,
+                 permutation2D.data());
+    glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST );
+    glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST );
+    CHECK_GL_ERROR();
+}
+
+void PermTextureTransition::prepareTransition( sal_Int32, sal_Int32, OpenGLContext* )
+{
+    CHECK_GL_ERROR();
+    GLint location = glGetUniformLocation( m_nProgramObject, "permTexture" );
+    if( location != -1 ) {
+        glActiveTexture(GL_TEXTURE1);
+        CHECK_GL_ERROR();
+        if( !m_nHelperTexture )
+            initPermTexture( &m_nHelperTexture );
+
+        glActiveTexture(GL_TEXTURE0);
+        CHECK_GL_ERROR();
+
+        glUniform1i( location, 1 );  // texture unit 1
+        CHECK_GL_ERROR();
+    }
+    CHECK_GL_ERROR();
+}
+
+}
+
+namespace
+{
+
+class StaticNoiseTransition : public PermTextureTransition
+{
+public:
+    StaticNoiseTransition(const TransitionScene& rScene, const TransitionSettings& rSettings)
+        : PermTextureTransition(rScene, rSettings)
+    {}
+
+private:
+    virtual GLuint makeShader() const override;
+};
+
+GLuint StaticNoiseTransition::makeShader() const
+{
+    return OpenGLHelper::LoadShaders( "basicVertexShader", "staticFragmentShader" );
+}
+
+std::shared_ptr<OGLTransitionImpl>
+makeStaticNoiseTransition(
+        Primitives_t&& rLeavingSlidePrimitives,
+        Primitives_t&& rEnteringSlidePrimitives,
+        const TransitionSettings& rSettings)
+{
+    return std::make_shared<StaticNoiseTransition>(
+            TransitionScene(std::move(rLeavingSlidePrimitives), std::move(rEnteringSlidePrimitives)),
+            rSettings)
+        ;
+}
+
+}
+
+std::shared_ptr<OGLTransitionImpl> makeStatic()
+{
+    Primitive Slide;
+
+    Slide.pushTriangle (glm::vec2 (0,0), glm::vec2 (1,0), glm::vec2 (0,1));
+    Slide.pushTriangle (glm::vec2 (1,0), glm::vec2 (0,1), glm::vec2 (1,1));
+    Primitives_t aLeavingSlide;
+    aLeavingSlide.push_back (Slide);
+    Primitives_t aEnteringSlide;
+    aEnteringSlide.push_back (Slide);
+
+    TransitionSettings aSettings;
+    aSettings.mbUseMipMapLeaving = aSettings.mbUseMipMapEntering = false;
+
+    return makeStaticNoiseTransition(std::move(aLeavingSlide), std::move(aEnteringSlide), aSettings);
+}
+
+namespace
+{
+
+class DissolveTransition : public PermTextureTransition
+{
+public:
+    DissolveTransition(const TransitionScene& rScene, const TransitionSettings& rSettings)
+        : PermTextureTransition(rScene, rSettings)
+    {}
+
+private:
+    virtual GLuint makeShader() const override;
+};
+
+GLuint DissolveTransition::makeShader() const
+{
+    return OpenGLHelper::LoadShaders( "basicVertexShader", "dissolveFragmentShader" );
+}
+
+std::shared_ptr<OGLTransitionImpl>
+makeDissolveTransition(
+        Primitives_t&& rLeavingSlidePrimitives,
+        Primitives_t&& rEnteringSlidePrimitives,
+        const TransitionSettings& rSettings)
+{
+    return std::make_shared<DissolveTransition>(
+            TransitionScene(std::move(rLeavingSlidePrimitives), std::move(rEnteringSlidePrimitives)),
+            rSettings)
+        ;
+}
+
+}
+
+std::shared_ptr<OGLTransitionImpl> makeDissolve()
+{
+    Primitive Slide;
+
+    Slide.pushTriangle (glm::vec2 (0,0), glm::vec2 (1,0), glm::vec2 (0,1));
+    Slide.pushTriangle (glm::vec2 (1,0), glm::vec2 (0,1), glm::vec2 (1,1));
+    Primitives_t aLeavingSlide;
+    aLeavingSlide.push_back (Slide);
+    Primitives_t aEnteringSlide;
+    aEnteringSlide.push_back (Slide);
+
+    TransitionSettings aSettings;
+    aSettings.mbUseMipMapLeaving = aSettings.mbUseMipMapEntering = false;
+
+    return makeDissolveTransition(std::move(aLeavingSlide), std::move(aEnteringSlide), aSettings);
+}
+
+namespace
+{
+
+class VortexTransition : public PermTextureTransition
+{
+public:
+    VortexTransition(const TransitionScene& rScene, const TransitionSettings& rSettings, int nNX, int nNY)
+        : PermTextureTransition(rScene, rSettings)
+        , maNumTiles(nNX,nNY)
+    {
+        mvTileInfo.resize(6*maNumTiles.x*maNumTiles.y);
+        mnFramebuffers[0] = 0;
+        mnFramebuffers[1] = 0;
+        mnDepthTextures[0] = 0;
+        mnDepthTextures[1] = 0;
+    }
+
+private:
+    virtual void finishTransition() override;
+    virtual GLuint makeShader() const override;
+    virtual void prepareTransition( sal_Int32 glLeavingSlideTex, sal_Int32 glEnteringSlideTex, OpenGLContext *pContext ) override;
+    virtual void displaySlides_( double nTime, sal_Int32 glLeavingSlideTex, sal_Int32 glEnteringSlideTex, double SlideWidthScale, double SlideHeightScale, OpenGLContext *pContext ) override;
+
+    GLint mnSlideLocation = -1;
+    GLint mnTileInfoLocation = -1;
+    GLuint mnTileInfoBuffer = 0u;
+    GLint mnShadowLocation = -1;
+    std::array<GLuint, 2> mnFramebuffers;
+    std::array<GLuint, 2> mnDepthTextures;
+
+    glm::ivec2 maNumTiles;
+
+    std::vector<GLfloat> mvTileInfo;
+};
+
+void VortexTransition::finishTransition()
+{
+    PermTextureTransition::finishTransition();
+
+    CHECK_GL_ERROR();
+    glDeleteTextures(2, mnDepthTextures.data());
+    mnDepthTextures = {0u, 0u};
+    CHECK_GL_ERROR();
+    glDeleteFramebuffers(2, mnFramebuffers.data());
+    mnFramebuffers = {0u, 0u};
+    glDeleteBuffers(1, &mnTileInfoBuffer);
+    mnTileInfoBuffer = 0u;
+    mnSlideLocation = -1;
+    mnTileInfoLocation = -1;
+    mnShadowLocation = -1;
+    CHECK_GL_ERROR();
+}
+
+GLuint VortexTransition::makeShader() const
+{
+    return OpenGLHelper::LoadShaders( "vortexVertexShader", "vortexFragmentShader", "vortexGeometryShader" );
+}
+
+glm::mat4 lookAt(const glm::vec3& eye, const glm::vec3& center, const glm::vec3& up) {
+    glm::vec3 f = glm::normalize(center - eye);
+    glm::vec3 u = glm::normalize(up);
+    glm::vec3 s = glm::normalize(glm::cross(f, u));
+    u = glm::cross(s, f);
+
+    return glm::mat4(s.x, u.x, -f.x, 0,
+                     s.y, u.y, -f.y, 0,
+                     s.z, u.z, -f.z, 0,
+                     -glm::dot(s, eye), -glm::dot(u, eye), glm::dot(f, eye), 1);
+}
+
+void VortexTransition::prepareTransition( sal_Int32 glLeavingSlideTex, sal_Int32 glEnteringSlideTex, OpenGLContext *pContext )
+{
+    CHECK_GL_ERROR();
+    PermTextureTransition::prepareTransition( glLeavingSlideTex, glEnteringSlideTex, pContext );
+    CHECK_GL_ERROR();
+
+    mnSlideLocation = glGetUniformLocation(m_nProgramObject, "slide");
+    mnTileInfoLocation = glGetAttribLocation(m_nProgramObject, "tileInfo");
+    GLint nNumTilesLocation = glGetUniformLocation(m_nProgramObject, "numTiles");
+    mnShadowLocation = glGetUniformLocation(m_nProgramObject, "shadow");
+    GLint nOrthoProjectionMatrix = glGetUniformLocation(m_nProgramObject, "orthoProjectionMatrix");
+    GLint nOrthoViewMatrix = glGetUniformLocation(m_nProgramObject, "orthoViewMatrix");
+    GLint location = glGetUniformLocation(m_nProgramObject, "leavingShadowTexture");
+    glUniform1i(location, 2);
+    location = glGetUniformLocation(m_nProgramObject, "enteringShadowTexture");
+    glUniform1i(location, 3);
+    CHECK_GL_ERROR();
+
+    glUniform2iv(nNumTilesLocation, 1, glm::value_ptr(maNumTiles));
+    CHECK_GL_ERROR();
+
+    glGenBuffers(1, &mnTileInfoBuffer);
+    CHECK_GL_ERROR();
+
+    // We store the (x,y) indexes of the tile each vertex belongs to in a float, so they must fit.
+    assert(maNumTiles.x < 256);
+    assert(maNumTiles.y < 256);
+
+    // Two triangles, i.e. six vertices, per tile
+    {
+        int n = 0;
+        for (int x = 0; x < maNumTiles.x; x++)
+        {
+            for (int y = 0; y < maNumTiles.y; y++)
+            {
+                for (int v = 0; v < 6; v++)
+                {
+                    mvTileInfo[n] = x + (y << 8) + (v << 16);
+                    n++;
+                }
+            }
+        }
+    }
+
+    glBindBuffer(GL_ARRAY_BUFFER, mnTileInfoBuffer);
+    CHECK_GL_ERROR();
+    glEnableVertexAttribArray(mnTileInfoLocation);
+    CHECK_GL_ERROR();
+    glVertexAttribPointer(mnTileInfoLocation, 1, GL_FLOAT, GL_FALSE, 0, nullptr);
+    CHECK_GL_ERROR();
+    glBufferData(GL_ARRAY_BUFFER, mvTileInfo.size()*sizeof(GLfloat), mvTileInfo.data(), GL_STATIC_DRAW);
+    CHECK_GL_ERROR();
+
+    glBindBuffer(GL_ARRAY_BUFFER, 0);
+    CHECK_GL_ERROR();
+
+    double EyePos(10.0);
+    double const RealF(1.0);
+    double const RealN(-1.0);
+    double const RealL(-2.0);
+    double RealR(2.0);
+    double const RealB(-2.0);
+    double RealT(2.0);
+    double ClipN(EyePos+5.0*RealN);
+    double ClipF(EyePos+15.0*RealF);
+    double ClipL(RealL*8.0);
+    double ClipR(RealR*8.0);
+    double ClipB(RealB*8.0);
+    double ClipT(RealT*8.0);
+
+    glm::mat4 projection = glm::ortho<float>(ClipL, ClipR, ClipB, ClipT, ClipN, ClipF);
+    //This scaling is to take the plane with BottomLeftCorner(-1,-1,0) and TopRightCorner(1,1,0) and map it to the screen after the perspective division.
+    glm::vec3 scale(1.0 / (((RealR * 2.0 * ClipN) / (EyePos * (ClipR - ClipL))) - ((ClipR + ClipL) / (ClipR - ClipL))),
+                    1.0 / (((RealT * 2.0 * ClipN) / (EyePos * (ClipT - ClipB))) - ((ClipT + ClipB) / (ClipT - ClipB))),
+                    1.0);
+    projection = glm::scale(projection, scale);
+    glUniformMatrix4fv(nOrthoProjectionMatrix, 1, false, glm::value_ptr(projection));
+
+    glm::mat4 view = lookAt(glm::vec3(-1, 1, EyePos), glm::vec3(-0.5, 0.5, 0), glm::vec3(0, 1, 0));
+    glUniformMatrix4fv(nOrthoViewMatrix, 1, false, glm::value_ptr(view));
+
+    // Generate the framebuffers and textures for the shadows.
+    glGenTextures(2, mnDepthTextures.data());
+    glGenFramebuffers(2, mnFramebuffers.data());
+
+    for (int i : {0, 1}) {
+        glBindTexture(GL_TEXTURE_2D, mnDepthTextures[i]);
+        glTexImage2D(GL_TEXTURE_2D, 0, GL_DEPTH_COMPONENT16, 2048, 2048, 0, GL_DEPTH_COMPONENT, GL_FLOAT, nullptr);
+        glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
+        glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
+        glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
+        glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
+
+        glBindFramebuffer(GL_FRAMEBUFFER, mnFramebuffers[i]);
+        glFramebufferTexture(GL_FRAMEBUFFER, GL_DEPTH_ATTACHMENT, mnDepthTextures[i], 0);
+        glDrawBuffer(GL_NONE); // No color buffer is drawn to.
+
+        // Always check that our framebuffer is ok
+        if(glCheckFramebufferStatus(GL_FRAMEBUFFER) != GL_FRAMEBUFFER_COMPLETE) {
+            SAL_WARN("slideshow.opengl", "Wrong framebuffer!");
+            return;
+        }
+    }
+
+    pContext->restoreDefaultFramebuffer();
+    glBindTexture(GL_TEXTURE_2D, 0);
+
+    glActiveTexture( GL_TEXTURE2 );
+    glBindTexture( GL_TEXTURE_2D, mnDepthTextures[0] );
+    glActiveTexture( GL_TEXTURE3 );
+    glBindTexture( GL_TEXTURE_2D, mnDepthTextures[1] );
+    glActiveTexture( GL_TEXTURE0 );
+}
+
+void VortexTransition::displaySlides_( double nTime, sal_Int32 glLeavingSlideTex, sal_Int32 glEnteringSlideTex, double SlideWidthScale, double SlideHeightScale, OpenGLContext * pContext )
+{
+    CHECK_GL_ERROR();
+    applyOverallOperations( nTime, SlideWidthScale, SlideHeightScale );
+    glUniform1f( m_nTimeLocation, nTime );
+    glUniform1f( mnShadowLocation, 1.0 );
+
+    std::array<GLint, 4> viewport;
+    glGetIntegerv(GL_VIEWPORT, viewport.data());
+    glViewport(0, 0, 2048, 2048);
+
+    glBindFramebuffer(GL_FRAMEBUFFER, mnFramebuffers[0]);
+    glClear(GL_DEPTH_BUFFER_BIT);
+    glUniform1f( mnSlideLocation, 0.0 );
+    displaySlide( nTime, glLeavingSlideTex, getScene().getLeavingSlide(), SlideWidthScale, SlideHeightScale );
+
+    glBindFramebuffer(GL_FRAMEBUFFER, mnFramebuffers[1]);
+    glClear(GL_DEPTH_BUFFER_BIT);
+    glUniform1f( mnSlideLocation, 1.0 );
+    displaySlide( nTime, glEnteringSlideTex, getScene().getEnteringSlide(), SlideWidthScale, SlideHeightScale );
+
+    glViewport(viewport[0], viewport[1], viewport[2], viewport[3]);
+    pContext->restoreDefaultFramebuffer();
+    glUniform1f( mnShadowLocation, 0.0 );
+    glUniform1f( mnSlideLocation, 0.0 );
+    displaySlide( nTime, glLeavingSlideTex, getScene().getLeavingSlide(), SlideWidthScale, SlideHeightScale );
+    glUniform1f( mnSlideLocation, 1.0 );
+    displaySlide( nTime, glEnteringSlideTex, getScene().getEnteringSlide(), SlideWidthScale, SlideHeightScale );
+    CHECK_GL_ERROR();
+}
+
+std::shared_ptr<OGLTransitionImpl>
+makeVortexTransition(Primitives_t&& rLeavingSlidePrimitives,
+                     Primitives_t&& rEnteringSlidePrimitives,
+                     const TransitionSettings& rSettings,
+                     int NX,
+                     int NY)
+{
+    return std::make_shared<VortexTransition>(TransitionScene(std::move(rLeavingSlidePrimitives), std::move(rEnteringSlidePrimitives)),
+                                              rSettings,
+                                              NX, NY);
+}
+
+}
+
+std::shared_ptr<OGLTransitionImpl> makeVortex()
+{
+    const int NX = 96, NY = 96;
+    Primitive Slide;
+
+    for (int x = 0; x < NX; x++)
+    {
+        for (int y = 0; y < NY; y++)
+        {
+            Slide.pushTriangle (glm::vec2 (fdiv(x,NX),fdiv(y,NY)), glm::vec2 (fdiv(x+1,NX),fdiv(y,NY)), glm::vec2 (fdiv(x,NX),fdiv(y+1,NY)));
+            Slide.pushTriangle (glm::vec2 (fdiv(x+1,NX),fdiv(y,NY)), glm::vec2 (fdiv(x,NX),fdiv(y+1,NY)), glm::vec2 (fdiv(x+1,NX),fdiv(y+1,NY)));
+        }
+    }
+    Primitives_t aLeavingSlide;
+    aLeavingSlide.push_back (Slide);
+    Primitives_t aEnteringSlide;
+    aEnteringSlide.push_back (Slide);
+
+    TransitionSettings aSettings;
+    aSettings.mbUseMipMapLeaving = aSettings.mbUseMipMapEntering = false;
+    aSettings.mnRequiredGLVersion = 3.2f;
+
+    return makeVortexTransition(std::move(aLeavingSlide), std::move(aEnteringSlide), aSettings, NX, NY);
+}
+
+namespace
+{
+
+class RippleTransition : public OGLTransitionImpl
+{
+public:
+    RippleTransition(const TransitionScene& rScene, const TransitionSettings& rSettings, const glm::vec2& rCenter)
+        : OGLTransitionImpl(rScene, rSettings),
+          maCenter(rCenter)
+    {
+    }
+
+private:
+    virtual GLuint makeShader() const override;
+    virtual void prepareTransition( sal_Int32 glLeavingSlideTex, sal_Int32 glEnteringSlideTex, OpenGLContext *pContext ) override;
+    virtual void prepare( double SlideWidth, double SlideHeight ) override;
+
+    glm::vec2 maCenter;
+    GLint maSlideRatioLocation = -1;
+};
+
+GLuint RippleTransition::makeShader() const
+{
+    return OpenGLHelper::LoadShaders( "basicVertexShader", "rippleFragmentShader" );
+}
+
+void RippleTransition::prepareTransition( sal_Int32, sal_Int32, OpenGLContext* )
+{
+    GLint nCenterLocation = glGetUniformLocation(m_nProgramObject, "center");
+    CHECK_GL_ERROR();
+
+    glUniform2fv(nCenterLocation, 1, glm::value_ptr(maCenter));
+    CHECK_GL_ERROR();
+
+    maSlideRatioLocation = glGetUniformLocation(m_nProgramObject, "slideRatio");
+    CHECK_GL_ERROR();
+}
+
+void RippleTransition::prepare( double SlideWidth, double SlideHeight )
+{
+    if( maSlideRatioLocation != -1 )
+        glUniform1f( maSlideRatioLocation, SlideWidth / SlideHeight );
+}
+
+std::shared_ptr<OGLTransitionImpl>
+makeRippleTransition(Primitives_t&& rLeavingSlidePrimitives,
+                     Primitives_t&& rEnteringSlidePrimitives,
+                     const TransitionSettings& rSettings)
+{
+    // The center point should be adjustable by the user, but we have no way to do that in the UI
+    return std::make_shared<RippleTransition>(TransitionScene(std::move(rLeavingSlidePrimitives), std::move(rEnteringSlidePrimitives)),
+                                              rSettings,
+                                              glm::vec2(0.5, 0.5));
+}
+
+}
+
+std::shared_ptr<OGLTransitionImpl> makeRipple()
+{
+    Primitive Slide;
+
+    Slide.pushTriangle (glm::vec2 (0,0), glm::vec2 (1,0), glm::vec2 (0,1));
+    Slide.pushTriangle (glm::vec2 (1,0), glm::vec2 (0,1), glm::vec2 (1,1));
+
+    Primitives_t aLeavingSlide;
+    aLeavingSlide.push_back (Slide);
+
+    Primitives_t aEnteringSlide;
+    aEnteringSlide.push_back (Slide);
+
+    TransitionSettings aSettings;
+    aSettings.mbUseMipMapLeaving = aSettings.mbUseMipMapEntering = false;
+
+    return makeRippleTransition(std::move(aLeavingSlide), std::move(aEnteringSlide), aSettings);
+}
+
+static void createHexagon(Primitive& aHexagon, const int x, const int y, const int NX, const int NY)
+{
+    if (y % 4 == 0)
+    {
+        aHexagon.pushTriangle(vec(x-1, y-1, NX, NY), vec(x,   y-2, NX, NY), vec(x, y+0.5, NX, NY));
+        aHexagon.pushTriangle(vec(x,   y-2, NX, NY), vec(x+1, y-1, NX, NY), vec(x, y+0.5, NX, NY));
+        aHexagon.pushTriangle(vec(x+1, y-1, NX, NY), vec(x+1, y,   NX, NY), vec(x, y+0.5, NX, NY));
+        aHexagon.pushTriangle(vec(x+1, y,   NX, NY), vec(x,   y+1, NX, NY), vec(x, y+0.5, NX, NY));
+        aHexagon.pushTriangle(vec(x,   y+1, NX, NY), vec(x-1, y,   NX, NY), vec(x, y+0.5, NX, NY));
+        aHexagon.pushTriangle(vec(x-1, y,   NX, NY), vec(x-1, y-1, NX, NY), vec(x, y+0.5, NX, NY));
+    }
+    else
+    {
+        aHexagon.pushTriangle(vec(x-2, y-1, NX, NY), vec(x-1, y-2, NX, NY), vec(x, y+0.5, NX, NY));
+        aHexagon.pushTriangle(vec(x-1, y-2, NX, NY), vec(x,   y-1, NX, NY), vec(x, y+0.5, NX, NY));
+        aHexagon.pushTriangle(vec(x,   y-1, NX, NY), vec(x,   y,   NX, NY), vec(x, y+0.5, NX, NY));
+        aHexagon.pushTriangle(vec(x,   y,   NX, NY), vec(x-1, y+1, NX, NY), vec(x, y+0.5, NX, NY));
+        aHexagon.pushTriangle(vec(x-1, y+1, NX, NY), vec(x-2, y,   NX, NY), vec(x, y+0.5, NX, NY));
+        aHexagon.pushTriangle(vec(x-2, y,   NX, NY), vec(x-2, y-1, NX, NY), vec(x, y+0.5, NX, NY));
+    }
+}
+
+namespace
+{
+
+class GlitterTransition : public PermTextureTransition
+{
+public:
+    GlitterTransition(const TransitionScene& rScene, const TransitionSettings& rSettings)
+        : PermTextureTransition(rScene, rSettings)
+    {
+    }
+
+private:
+    virtual GLuint makeShader() const override;
+    virtual void prepareTransition( sal_Int32 glLeavingSlideTex, sal_Int32 glEnteringSlideTex, OpenGLContext *pContext ) override;
+    virtual void cleanup() override;
+
+    GLuint maBuffer = 0;
+};
+
+GLuint GlitterTransition::makeShader() const
+{
+    return OpenGLHelper::LoadShaders( "glitterVertexShader", "glitterFragmentShader" );
+}
+
+struct ThreeFloats
+{
+    GLfloat x, y, z;
+};
+
+void GlitterTransition::prepareTransition( sal_Int32 glLeavingSlideTex, sal_Int32 glEnteringSlideTex, OpenGLContext *pContext )
+{
+    CHECK_GL_ERROR();
+    PermTextureTransition::prepareTransition( glLeavingSlideTex, glEnteringSlideTex, pContext );
+    CHECK_GL_ERROR();
+
+    GLint nNumTilesLocation = glGetUniformLocation(m_nProgramObject, "numTiles");
+    if (nNumTilesLocation != -1) {
+        glUniform2iv(nNumTilesLocation, 1, glm::value_ptr(glm::ivec2(41, 41 * 4 / 3)));
+        CHECK_GL_ERROR();
+    }
+
+    glGenBuffers(1, &maBuffer);
+    glBindBuffer(GL_ARRAY_BUFFER, maBuffer);
+
+    // Upload the center of each hexagon.
+    const Primitive& primitive = getScene().getLeavingSlide()[0];
+    std::vector<ThreeFloats> vertices;
+    for (int i = 2; i < primitive.getVerticesCount(); i += 18) {
+        const glm::vec3& center = primitive.getVertex(i);
+        for (int j = 0; j < 18; ++j)
+            vertices.push_back({center.x, center.y, center.z});
+    }
+    glBufferData(GL_ARRAY_BUFFER, vertices.size() * 3 * sizeof(GLfloat), vertices.data(), GL_STATIC_DRAW);
+
+    GLint location = glGetAttribLocation(m_nProgramObject, "center");
+    if (location != -1) {
+        glEnableVertexAttribArray(location);
+        glVertexAttribPointer( location, 3, GL_FLOAT, false, 0, nullptr );
+        CHECK_GL_ERROR();
+    }
+
+    glBindBuffer(GL_ARRAY_BUFFER, 0);
+}
+
+void GlitterTransition::cleanup()
+{
+    CHECK_GL_ERROR();
+    glDeleteBuffers(1, &maBuffer);
+    CHECK_GL_ERROR();
+}
+
+std::shared_ptr<OGLTransitionImpl>
+makeGlitterTransition(Primitives_t&& rLeavingSlidePrimitives,
+                      Primitives_t&& rEnteringSlidePrimitives,
+                      const TransitionSettings& rSettings)
+{
+    return std::make_shared<GlitterTransition>(TransitionScene(std::move(rLeavingSlidePrimitives), std::move(rEnteringSlidePrimitives)),
+                                               rSettings);
+}
+
+}
+
+std::shared_ptr<OGLTransitionImpl> makeGlitter()
+{
+    const int NX = 80;
+    const int NY = NX * 4 / 3;
+
+    Primitives_t aSlide;
+    Primitives_t aEmptySlide;
+    Primitive aHexagon;
+
+    for (int y = 0; y < NY+2; y+=2)
+        for (int x = 0; x < NX+2; x+=2)
+            createHexagon(aHexagon, x, y, NX, NY);
+
+    aSlide.push_back(aHexagon);
+
+    return makeGlitterTransition(std::move(aSlide), std::move(aEmptySlide), TransitionSettings());
+}
+
+namespace
+{
+
+class HoneycombTransition : public PermTextureTransition
+{
+public:
+    HoneycombTransition(const TransitionScene& rScene, const TransitionSettings& rSettings)
+        : PermTextureTransition(rScene, rSettings)
+    {
+        mnDepthTextures[0] = 0;
+        mnDepthTextures[1] = 0;
+    }
+
+private:
+    virtual void finishTransition() override;
+    virtual GLuint makeShader() const override;
+    virtual void prepareTransition( sal_Int32 glLeavingSlideTex, sal_Int32 glEnteringSlideTex, OpenGLContext *pContext ) override;
+    virtual void displaySlides_( double nTime, sal_Int32 glLeavingSlideTex, sal_Int32 glEnteringSlideTex, double SlideWidthScale, double SlideHeightScale, OpenGLContext *pContext ) override;
+
+    GLint maHexagonSizeLocation = -1;
+    GLint maSelectedTextureLocation = -1;
+    GLint mnShadowLocation = -1;
+    GLuint mnFramebuffer = 0u;
+    std::array<GLuint, 2> mnDepthTextures;
+};
+
+void HoneycombTransition::finishTransition()
+{
+    PermTextureTransition::finishTransition();
+
+    CHECK_GL_ERROR();
+    glActiveTexture( GL_TEXTURE2 );
+    glBindTexture( GL_TEXTURE_2D, 0 );
+    glActiveTexture( GL_TEXTURE3 );
+    glBindTexture( GL_TEXTURE_2D, 0 );
+    glActiveTexture( GL_TEXTURE0 );
+    CHECK_GL_ERROR();
+    glDeleteTextures(2, mnDepthTextures.data());
+    mnDepthTextures = {0u, 0u};
+    CHECK_GL_ERROR();
+    glDeleteFramebuffers(1, &mnFramebuffer);
+    mnFramebuffer = 0u;
+    CHECK_GL_ERROR();
+}
+
+GLuint HoneycombTransition::makeShader() const
+{
+    return OpenGLHelper::LoadShaders( "honeycombVertexShader", "honeycombFragmentShader", "honeycombGeometryShader" );
+}
+
+void HoneycombTransition::prepareTransition( sal_Int32 glLeavingSlideTex, sal_Int32 glEnteringSlideTex, OpenGLContext *pContext )
+{
+    CHECK_GL_ERROR();
+    PermTextureTransition::prepareTransition( glLeavingSlideTex, glEnteringSlideTex, pContext );
+
+    CHECK_GL_ERROR();
+    maHexagonSizeLocation = glGetUniformLocation(m_nProgramObject, "hexagonSize");
+    maSelectedTextureLocation = glGetUniformLocation( m_nProgramObject, "selectedTexture" );
+    mnShadowLocation = glGetUniformLocation(m_nProgramObject, "shadow");
+    GLint nOrthoProjectionMatrix = glGetUniformLocation(m_nProgramObject, "orthoProjectionMatrix");
+    GLint nOrthoViewMatrix = glGetUniformLocation(m_nProgramObject, "orthoViewMatrix");
+    GLint location = glGetUniformLocation(m_nProgramObject, "colorShadowTexture");
+    glUniform1i(location, 2);
+    location = glGetUniformLocation(m_nProgramObject, "depthShadowTexture");
+    glUniform1i(location, 3);
+    CHECK_GL_ERROR();
+
+    // We want to see the entering slide behind the leaving one.
+    glEnable(GL_BLEND);
+    glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
+    CHECK_GL_ERROR();
+
+    double EyePos(10.0);
+    double const RealF(1.0);
+    double const RealN(-1.0);
+    double const RealL(-4.0);
+    double RealR(4.0);
+    double const RealB(-4.0);
+    double RealT(4.0);
+    double ClipN(EyePos+5.0*RealN);
+    double ClipF(EyePos+15.0*RealF);
+    double ClipL(RealL*8.0);
+    double ClipR(RealR*8.0);
+    double ClipB(RealB*8.0);
+    double ClipT(RealT*8.0);
+
+    glm::mat4 projection = glm::ortho<float>(ClipL, ClipR, ClipB, ClipT, ClipN, ClipF);
+    //This scaling is to take the plane with BottomLeftCorner(-1,-1,0) and TopRightCorner(1,1,0) and map it to the screen after the perspective division.
+    glm::vec3 scale(1.0 / (((RealR * 2.0 * ClipN) / (EyePos * (ClipR - ClipL))) - ((ClipR + ClipL) / (ClipR - ClipL))),
+                    1.0 / (((RealT * 2.0 * ClipN) / (EyePos * (ClipT - ClipB))) - ((ClipT + ClipB) / (ClipT - ClipB))),
+                    1.0);
+    projection = glm::scale(projection, scale);
+    glUniformMatrix4fv(nOrthoProjectionMatrix, 1, false, glm::value_ptr(projection));
+
+    glm::mat4 view = lookAt(glm::vec3(0, 0, EyePos), glm::vec3(0, 0, 0), glm::vec3(0, 1, 0));
+    glUniformMatrix4fv(nOrthoViewMatrix, 1, false, glm::value_ptr(view));
+
+    // Generate the framebuffer and textures for the shadows.
+    glGenTextures(2, mnDepthTextures.data());
+    glActiveTexture(GL_TEXTURE2);
+    glBindTexture(GL_TEXTURE_2D, mnDepthTextures[0]);
+    glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, 2048, 2048, 0, GL_RGBA, GL_FLOAT, nullptr);
+    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
+    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
+    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
+    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
+
+    glActiveTexture(GL_TEXTURE3);
+    glBindTexture(GL_TEXTURE_2D, mnDepthTextures[1]);
+    glTexImage2D(GL_TEXTURE_2D, 0, GL_DEPTH_COMPONENT16, 2048, 2048, 0, GL_DEPTH_COMPONENT, GL_FLOAT, nullptr);
+    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
+    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
+    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
+    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
+
+    glActiveTexture(GL_TEXTURE0);
+    glGenFramebuffers(1, &mnFramebuffer);
+    glBindFramebuffer(GL_FRAMEBUFFER, mnFramebuffer);
+    glFramebufferTexture(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, mnDepthTextures[0], 0);
+    glFramebufferTexture(GL_FRAMEBUFFER, GL_DEPTH_ATTACHMENT, mnDepthTextures[1], 0);
+
+    // Always check that our framebuffer is ok
+    if(glCheckFramebufferStatus(GL_FRAMEBUFFER) != GL_FRAMEBUFFER_COMPLETE) {
+        SAL_WARN("slideshow.opengl", "Wrong framebuffer!");
+        return;
+    }
+
+    pContext->restoreDefaultFramebuffer();
+}
+
+void HoneycombTransition::displaySlides_( double nTime, sal_Int32 glLeavingSlideTex, sal_Int32 glEnteringSlideTex,
+                                          double SlideWidthScale, double SlideHeightScale, OpenGLContext *pContext )
+{
+    CHECK_GL_ERROR();
+    applyOverallOperations(nTime, SlideWidthScale, SlideHeightScale);
+    glUniform1f(m_nTimeLocation, nTime);
+    glUniform1f(mnShadowLocation, 1.0);
+    CHECK_GL_ERROR();
+
+    const float borderSize = 0.15f;
+
+    std::array<GLint, 4> viewport;
+    glGetIntegerv(GL_VIEWPORT, viewport.data());
+    glViewport(0, 0, 2048, 2048);
+    glBindFramebuffer(GL_FRAMEBUFFER, mnFramebuffer);
+    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
+    glUniform1f(mnShadowLocation, 1.0);
+    glUniform1f(maSelectedTextureLocation, 1.0);
+    glUniform1f(maHexagonSizeLocation, 1.0f - borderSize);
+    displaySlide(nTime, glLeavingSlideTex, getScene().getLeavingSlide(), SlideWidthScale, SlideHeightScale);
+    glUniform1f(maHexagonSizeLocation, 1.0f + borderSize);
+    displaySlide(nTime, glLeavingSlideTex, getScene().getLeavingSlide(), SlideWidthScale, SlideHeightScale);
+
+    // The back (entering) slide needs to be drawn before the front (leaving) one in order for blending to work.
+    glViewport(viewport[0], viewport[1], viewport[2], viewport[3]);
+    pContext->restoreDefaultFramebuffer();
+    glUniform1f(mnShadowLocation, 0.0);
+    glUniform1f(maSelectedTextureLocation, 0.0);
+    glUniform1f(maHexagonSizeLocation, 1.0f - borderSize);
+    displaySlide(nTime, glEnteringSlideTex, getScene().getEnteringSlide(), SlideWidthScale, SlideHeightScale);
+    glUniform1f(maHexagonSizeLocation, 1.0f + borderSize);
+    displaySlide(nTime, glEnteringSlideTex, getScene().getEnteringSlide(), SlideWidthScale, SlideHeightScale);
+    glUniform1f(maSelectedTextureLocation, 1.0);
+    glUniform1f(maHexagonSizeLocation, 1.0f - borderSize);
+    displaySlide(nTime, glLeavingSlideTex, getScene().getLeavingSlide(), SlideWidthScale, SlideHeightScale);
+    glUniform1f(maHexagonSizeLocation, 1.0f + borderSize);
+    displaySlide(nTime, glLeavingSlideTex, getScene().getLeavingSlide(), SlideWidthScale, SlideHeightScale);
+    CHECK_GL_ERROR();
+}
+
+std::shared_ptr<OGLTransitionImpl>
+makeHoneycombTransition(Primitives_t&& rLeavingSlidePrimitives,
+                        Primitives_t&& rEnteringSlidePrimitives,
+                        const TransitionSettings& rSettings)
+{
+    // The center point should be adjustable by the user, but we have no way to do that in the UI
+    return std::make_shared<HoneycombTransition>(TransitionScene(std::move(rLeavingSlidePrimitives), std::move(rEnteringSlidePrimitives)),
+                                                 rSettings);
+}
+
+}
+
+std::shared_ptr<OGLTransitionImpl> makeHoneycomb()
+{
+    const int NX = 21;
+    const int NY = 21;
+
+    TransitionSettings aSettings;
+    aSettings.mnRequiredGLVersion = 3.2f;
+
+    Primitives_t aSlide;
+    Primitive aHexagon;
+    for (int y = 0; y < NY+2; y+=2)
+        for (int x = 0; x < NX+2; x+=2)
+            aHexagon.pushTriangle(glm::vec2((y % 4) ? fdiv(x, NX) : fdiv(x + 1, NX), fdiv(y, NY)), glm::vec2(1, 0), glm::vec2(0, 0));
+    aSlide.push_back(aHexagon);
+
+    return makeHoneycombTransition(std::vector(aSlide), std::vector(aSlide), aSettings);
+}
+
+std::shared_ptr<OGLTransitionImpl> makeNewsflash()
+{
+    Primitive Slide;
+
+    Slide.pushTriangle(glm::vec2(0,0),glm::vec2(1,0),glm::vec2(0,1));
+    Slide.pushTriangle(glm::vec2(1,0),glm::vec2(0,1),glm::vec2(1,1));
+    Slide.Operations.push_back(makeSRotate(glm::vec3(0,0,1),glm::vec3(0,0,0),3000,true,0,0.5));
+    Slide.Operations.push_back(makeSScale(glm::vec3(0.01,0.01,0.01),glm::vec3(0,0,0),true,0,0.5));
+    Slide.Operations.push_back(makeSTranslate(glm::vec3(-10000, 0, 0),false, 0.5, 2));
+    Primitives_t aLeavingSlide;
+    aLeavingSlide.push_back(Slide);
+
+    Slide.Operations.clear();
+    Slide.Operations.push_back(makeSRotate(glm::vec3(0,0,1),glm::vec3(0,0,0),-3000,true,0.5,1));
+    Slide.Operations.push_back(makeSTranslate(glm::vec3(-100, 0, 0),false, -1, 1));
+    Slide.Operations.push_back(makeSTranslate(glm::vec3(100, 0, 0),false, 0.5, 1));
+    Slide.Operations.push_back(makeSScale(glm::vec3(0.01,0.01,0.01),glm::vec3(0,0,0),false,-1,1));
+    Slide.Operations.push_back(makeSScale(glm::vec3(100,100,100),glm::vec3(0,0,0),true,0.5,1));
+    Primitives_t aEnteringSlide;
+    aEnteringSlide.push_back(Slide);
+
+    Operations_t aOverallOperations;
+    aOverallOperations.push_back(makeSRotate(glm::vec3(0,0,1),glm::vec3(0.2,0.2,0),1080,true,0,1));
+
+    return makeSimpleTransition(std::move(aLeavingSlide), std::move(aEnteringSlide), std::move(aOverallOperations));
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */