Adding upstream version 1:7.0.4.upstream/1%7.0.4upstream

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

23 files changed, 2159 insertions, 0 deletions

diff --git a/vcl/inc/opengl/BufferObject.hxx b/vcl/inc/opengl/BufferObject.hxx
new file mode 100644
index 000000000..396de89de
--- /dev/null
+++ b/vcl/inc/opengl/BufferObject.hxx
@@ -0,0 +1,84 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ */
+
+#ifndef INCLUDED_VCL_INC_OPENGL_BUFFEROBJECT_H
+#define INCLUDED_VCL_INC_OPENGL_BUFFEROBJECT_H
+
+namespace vcl
+{
+
+template<typename TYPE, GLenum BUFFER_TYPE>
+class BufferObject
+{
+private:
+    GLuint mId;
+
+public:
+    BufferObject()
+        : mId(0)
+    {
+        glGenBuffers(1, &mId);
+        CHECK_GL_ERROR();
+    }
+
+    virtual ~BufferObject()
+    {
+        if (mId)
+        {
+            glDeleteBuffers(1, &mId);
+            CHECK_GL_ERROR();
+            mId = 0;
+        }
+    }
+
+    void bind()
+    {
+        if (mId)
+        {
+            glBindBuffer(BUFFER_TYPE, mId);
+            CHECK_GL_ERROR();
+        }
+    }
+
+    void unbind()
+    {
+        if (mId)
+        {
+            glBindBuffer(BUFFER_TYPE, 0);
+            CHECK_GL_ERROR();
+        }
+    }
+
+    void upload(const std::vector<TYPE>& rData)
+    {
+        if (mId)
+        {
+            bind();
+            glBufferData(BUFFER_TYPE, sizeof(TYPE) * rData.size(), rData.data(), GL_STATIC_DRAW);
+            CHECK_GL_ERROR();
+        }
+    }
+
+};
+
+template<typename TYPE>
+class VertexBufferObject final : public BufferObject<TYPE, GL_ARRAY_BUFFER>
+{
+};
+
+class IndexBufferObject final : public BufferObject<GLuint, GL_ELEMENT_ARRAY_BUFFER>
+{
+};
+
+} // end vcl
+
+#endif // INCLUDED_VCL_INC_OPENGL_BUFFEROBJECT_H
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/vcl/inc/opengl/DeviceInfo.hxx b/vcl/inc/opengl/DeviceInfo.hxx
new file mode 100644
index 000000000..b0ad3a6cf
--- /dev/null
+++ b/vcl/inc/opengl/DeviceInfo.hxx
@@ -0,0 +1,23 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+#ifndef INCLUDED_VCL_INC_OPENGL_DEVICEINFO_HXX
+#define INCLUDED_VCL_INC_OPENGL_DEVICEINFO_HXX
+
+class OpenGLDeviceInfo
+{
+public:
+    virtual ~OpenGLDeviceInfo() = 0;
+
+    virtual bool isDeviceBlocked() = 0;
+};
+
+#endif
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/vcl/inc/opengl/FixedTextureAtlas.hxx b/vcl/inc/opengl/FixedTextureAtlas.hxx
new file mode 100644
index 000000000..e576fcb54
--- /dev/null
+++ b/vcl/inc/opengl/FixedTextureAtlas.hxx
@@ -0,0 +1,47 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ */
+
+#ifndef INCLUDED_VCL_INC_OPENGL_FIXEDTEXTUREATLAS_HXX
+#define INCLUDED_VCL_INC_OPENGL_FIXEDTEXTUREATLAS_HXX
+
+#include <memory>
+#include <opengl/texture.hxx>
+
+struct FixedTexture;
+
+class FixedTextureAtlasManager final
+{
+    std::vector<std::unique_ptr<FixedTexture>> maFixedTextures;
+
+    int mWidthFactor;
+    int mHeightFactor;
+    int mSubTextureSize;
+
+    void CreateNewTexture();
+
+    FixedTextureAtlasManager( const FixedTextureAtlasManager& ) = delete;
+    FixedTextureAtlasManager& operator=( const FixedTextureAtlasManager& ) = delete;
+
+public:
+    FixedTextureAtlasManager(int nWidthFactor, int nHeightFactor, int nTextureSize);
+    ~FixedTextureAtlasManager();
+
+    OpenGLTexture InsertBuffer(int nWidth, int nHeight, int nFormat, int nType, sal_uInt8 const * pData);
+    OpenGLTexture Reserve(int nWidth, int nHeight);
+
+    int GetSubtextureSize() const
+    {
+        return mSubTextureSize;
+    }
+};
+
+#endif // INCLUDED_VCL_INC_OPENGL_FIXEDTEXTUREATLAS_HXX
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/vcl/inc/opengl/LineRenderUtils.hxx b/vcl/inc/opengl/LineRenderUtils.hxx
new file mode 100644
index 000000000..8d97fa3ee
--- /dev/null
+++ b/vcl/inc/opengl/LineRenderUtils.hxx
@@ -0,0 +1,55 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ */
+
+#ifndef INCLUDED_VCL_INC_OPENGL_LINERENDERUTILS_H
+#define INCLUDED_VCL_INC_OPENGL_LINERENDERUTILS_H
+
+#include <opengl/RenderList.hxx>
+
+namespace vcl
+{
+class LineBuilder
+{
+private:
+    std::vector<Vertex>& mrVertices;
+    std::vector<GLuint>& mrIndices;
+    GLubyte mR, mG, mB, mA;
+    GLfloat mfLineWidth;
+    GLfloat mfLineWidthAndAA;
+    size_t mnInitialIndexSize;
+    bool mbIncomplete;
+
+public:
+    LineBuilder(std::vector<Vertex>& rVertices, std::vector<GLuint>& rIndices,
+                Color nColor, GLfloat fTransparency,
+                GLfloat fLineWidth, bool bUseAA);
+
+    void appendLineSegment(const glm::vec2& rPoint1, const glm::vec2& rNormal1, GLfloat aExtrusion1,
+                           const glm::vec2& rPoint2, const glm::vec2& rNormal2, GLfloat aExtrusion2);
+
+    void appendLine(const glm::vec2& rPoint1, const glm::vec2& rPoint2);
+
+    void appendAndConnectLinePoint(const glm::vec2& rPoint, const glm::vec2& aNormal, GLfloat aExtrusion);
+
+    void appendMiterJoint(glm::vec2 const& point, const glm::vec2& prevLineVector,
+                          glm::vec2 const& nextLineVector);
+    void appendBevelJoint(glm::vec2 const& point, const glm::vec2& prevLineVector,
+                          const glm::vec2& nextLineVector);
+    void appendRoundJoint(glm::vec2 const& point, const glm::vec2& prevLineVector,
+                          const glm::vec2& nextLineVector);
+    void appendRoundLineCapVertices(const glm::vec2& rPoint1, const glm::vec2& rPoint2);
+    void appendSquareLineCapVertices(const glm::vec2& rPoint1, const glm::vec2& rPoint2);
+};
+
+} // end vcl
+
+#endif // INCLUDED_VCL_INC_OPENGL_LINERENDERUTILS_H
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/vcl/inc/opengl/PackedTextureAtlas.hxx b/vcl/inc/opengl/PackedTextureAtlas.hxx
new file mode 100644
index 000000000..7a283aa45
--- /dev/null
+++ b/vcl/inc/opengl/PackedTextureAtlas.hxx
@@ -0,0 +1,57 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ */
+
+#ifndef INCLUDED_VCL_INC_OPENGL_PACKEDTEXTUREATLAS_HXX
+#define INCLUDED_VCL_INC_OPENGL_PACKEDTEXTUREATLAS_HXX
+
+#include <memory>
+#include <opengl/texture.hxx>
+
+struct PackedTexture;
+
+/**
+ * Pack textures into one texture atlas.
+ *
+ * This is based on algorithm described in [1] and is an
+ * adaptation of "texture atlas generator" from [2].
+ *
+ * [1]: http://www.blackpawn.com/texts/lightmaps/
+ * [2]: https://github.com/lukaszdk/texture-atlas-generator
+ *
+ */
+class VCL_DLLPUBLIC PackedTextureAtlasManager final
+{
+    std::vector<std::unique_ptr<PackedTexture>> maPackedTextures;
+
+    int mnTextureWidth;
+    int mnTextureHeight;
+
+    void CreateNewTexture();
+
+    PackedTextureAtlasManager( const PackedTextureAtlasManager& ) = delete;
+    PackedTextureAtlasManager& operator=( const PackedTextureAtlasManager& ) = delete;
+
+public:
+
+    /**
+     * nTextureWidth and nTextureHeight are the dimensions of the common texture(s)
+     * nTextureLimit is the maximum limit of that a texture atlas can have (0 or less - unlimited)
+     */
+    PackedTextureAtlasManager(int nTextureWidth, int nTextureHeight);
+    ~PackedTextureAtlasManager();
+
+    OpenGLTexture InsertBuffer(int nWidth, int nHeight, int nFormat, int nType, sal_uInt8 const * pData);
+    OpenGLTexture Reserve(int nWidth, int nHeight);
+    std::vector<GLuint> ReduceTextureNumber(int nMaxNumberOfTextures);
+};
+
+#endif // INCLUDED_VCL_INC_OPENGL_PACKEDTEXTUREATLAS_HXX
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/vcl/inc/opengl/RenderList.hxx b/vcl/inc/opengl/RenderList.hxx
new file mode 100644
index 000000000..213a2f43b
--- /dev/null
+++ b/vcl/inc/opengl/RenderList.hxx
@@ -0,0 +1,173 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ */
+
+#ifndef INCLUDED_VCL_INC_OPENGL_RENDERLIST_H
+#define INCLUDED_VCL_INC_OPENGL_RENDERLIST_H
+
+#include <unordered_map>
+
+#include <glm/glm.hpp>
+
+#include <vcl/salgtype.hxx>
+#include <basegfx/range/b2drange.hxx>
+#include <basegfx/polygon/b2dpolypolygon.hxx>
+
+#include <opengl/texture.hxx>
+
+#include <com/sun/star/drawing/LineCap.hpp>
+
+struct Vertex
+{
+    glm::vec2 position;
+    glm::vec4 color;
+    glm::vec4 lineData;
+};
+
+static_assert(sizeof(Vertex) == (2*4 + 4*4 + 4*4), "Vertex struct has wrong size/alignment");
+
+
+struct RenderParameters
+{
+    std::vector<Vertex> maVertices;
+    std::vector<GLuint> maIndices;
+};
+
+struct RenderTextureParameters
+{
+    std::vector<GLfloat>   maVertices;
+    std::vector<GLfloat>   maTextureCoords;
+    std::vector<GLubyte>   maColors;
+    OpenGLTexture          maTexture;
+};
+
+struct RenderEntry
+{
+    basegfx::B2DRange maOverlapTrackingRectangle;
+
+    RenderParameters maTriangleParameters;
+    RenderParameters maLineParameters;
+
+    std::unordered_map<GLuint, RenderTextureParameters> maTextureParametersMap;
+
+    bool hasTriangles() const
+    {
+        return !maTriangleParameters.maVertices.empty();
+    }
+
+    bool hasLines() const
+    {
+        return !maLineParameters.maVertices.empty();
+    }
+
+    bool hasTextures() const
+    {
+        return !maTextureParametersMap.empty();
+    }
+};
+
+class RenderList
+{
+private:
+    std::vector<RenderEntry> maRenderEntries;
+    std::vector<basegfx::B2DRange> maRectangles;
+
+    bool doesOverlap(const basegfx::B2DRange& rDrawRectangle)
+    {
+        if (!maRenderEntries.back().maOverlapTrackingRectangle.overlaps(rDrawRectangle))
+            return false;
+
+        for (const basegfx::B2DRange& rRectangle : maRectangles)
+        {
+            if (rRectangle.overlaps(rDrawRectangle))
+                return true;
+        }
+        return false;
+    }
+
+    void checkOverlapping(const basegfx::B2DRange& rDrawRectangle)
+    {
+        if (maRenderEntries.empty() || doesOverlap(rDrawRectangle))
+        {
+            maRenderEntries.emplace_back();
+            maRenderEntries.back().maOverlapTrackingRectangle = rDrawRectangle;
+
+            maRectangles.clear();
+            maRectangles.reserve(30);
+            maRectangles.push_back(rDrawRectangle);
+        }
+        else
+        {
+            maRenderEntries.back().maOverlapTrackingRectangle.expand(rDrawRectangle);
+
+            if (maRectangles.size() < 30)
+            {
+                maRectangles.push_back(rDrawRectangle);
+            }
+            else
+            {
+                basegfx::B2DRange aTempRectangle(maRectangles[0]);
+                aTempRectangle.expand(rDrawRectangle);
+                double minArea = aTempRectangle.getWidth() * aTempRectangle.getHeight();
+                size_t index = 0;
+
+                double area;
+                for (size_t i = 1; i < maRectangles.size(); ++i)
+                {
+                    aTempRectangle = maRectangles[i];
+                    aTempRectangle.expand(rDrawRectangle);
+                    area = aTempRectangle.getWidth() * aTempRectangle.getHeight();
+                    if (area < minArea)
+                        index = i;
+                }
+                maRectangles[index].expand(rDrawRectangle);
+            }
+        }
+    }
+
+public:
+
+    RenderList() = default;
+
+    bool empty()
+    {
+        return maRenderEntries.empty();
+    }
+
+    void clear()
+    {
+        maRenderEntries.clear();
+    }
+
+    std::vector<RenderEntry>& getEntries()
+    {
+        return maRenderEntries;
+    }
+
+    VCL_DLLPUBLIC void addDrawTextureWithMaskColor(OpenGLTexture const & rTexture, Color nColor, const SalTwoRect& r2Rect);
+
+    void addDrawPixel(long nX, long nY, Color nColor);
+
+    void addDrawRectangle(long nX, long nY, long nWidth, long nHeight, double fTransparency,
+                          Color nLineColor, Color nFillColor);
+
+    void addDrawLine(long nX1, long nY1, long nX2, long nY2, Color nLineColor, bool bUseAA);
+
+    void addDrawPolyPolygon(const basegfx::B2DPolyPolygon& rPolyPolygon, double fTransparency,
+                            Color nLineColor, Color nFillColor, bool bUseAA);
+
+    void addDrawPolyLine(const basegfx::B2DPolygon& rPolygon, double fTransparency,
+                         double fLineWidth, basegfx::B2DLineJoin eLineJoin,
+                         css::drawing::LineCap eLineCap, double fMiterMinimumAngle,
+                         Color nLineColor, bool bUseAA);
+};
+
+#endif // INCLUDED_VCL_INC_OPENGL_RENDERLIST_H
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/vcl/inc/opengl/RenderState.hxx b/vcl/inc/opengl/RenderState.hxx
new file mode 100644
index 000000000..3a89344e2
--- /dev/null
+++ b/vcl/inc/opengl/RenderState.hxx
@@ -0,0 +1,188 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ */
+
+#ifndef INCLUDED_VCL_INC_OPENGL_RENDER_STATE_H
+#define INCLUDED_VCL_INC_OPENGL_RENDER_STATE_H
+
+#include <opengl/TextureState.hxx>
+
+template<GLenum ENUM_TYPE, typename TYPE>
+class GenericCapabilityState
+{
+protected:
+    bool mbTest;
+
+    GenericCapabilityState()
+        : mbTest(false)
+    {
+    }
+
+    static bool readState()
+    {
+        return glIsEnabled(ENUM_TYPE);
+    }
+
+public:
+    void sync()
+    {
+        mbTest = readState();
+    }
+
+    void enable()
+    {
+        if (!mbTest)
+        {
+            glEnable(ENUM_TYPE);
+            CHECK_GL_ERROR();
+            mbTest = true;
+        }
+        else
+        {
+            VCL_GL_INFO(TYPE::className() << ": enable called but already enabled");
+        }
+#ifdef DBG_UTIL
+        checkState();
+#endif
+    }
+
+    void disable()
+    {
+        if (mbTest)
+        {
+            glDisable(ENUM_TYPE);
+            CHECK_GL_ERROR();
+            mbTest = false;
+        }
+        else
+        {
+            VCL_GL_INFO(TYPE::className() << ": disable called but already disabled");
+        }
+#ifdef DBG_UTIL
+        checkState();
+#endif
+    }
+
+#ifdef DBG_UTIL
+    void checkState()
+    {
+        bool bRealState = readState();
+        if (mbTest != bRealState)
+        {
+            VCL_GL_INFO(TYPE::className() << " mismatch! "
+                            << "Expected: " << (mbTest ? "enabled" : "disabled")
+                            << " but is: "        << (bRealState ? "enabled" : "disabled"));
+        }
+    }
+#endif
+};
+
+class ScissorState : public GenericCapabilityState<GL_SCISSOR_TEST, ScissorState>
+{
+private:
+    int mX;
+    int mY;
+    int mWidth;
+    int mHeight;
+
+public:
+    static std::string className() { return std::string("ScissorState"); }
+
+    ScissorState()
+        : mX(0)
+        , mY(0)
+        , mWidth(0)
+        , mHeight(0)
+    {}
+
+    void set(int x, int y, int width, int height)
+    {
+        if (x != mX || y != mY || width != mWidth || height != mHeight)
+        {
+            glScissor(x, y, width, height);
+            CHECK_GL_ERROR();
+
+            mX = x;
+            mY = y;
+            mWidth = width;
+            mHeight = height;
+        }
+    }
+};
+
+class StencilState : public GenericCapabilityState<GL_STENCIL_TEST, StencilState>
+{
+public:
+    static std::string className() { return std::string("StencilState"); }
+};
+
+class BlendState : public GenericCapabilityState<GL_BLEND, BlendState>
+{
+    GLenum mnSourceMode;
+    GLenum mnDestinationMode;
+public:
+    BlendState()
+        : mnSourceMode(GL_ZERO)
+        , mnDestinationMode(GL_ZERO)
+    {}
+
+    static std::string className() { return std::string("BlendState"); }
+
+    void func(GLenum nSource, GLenum nDestination)
+    {
+        if (mnSourceMode != nSource || mnDestinationMode != nDestination)
+        {
+            glBlendFunc(nSource, nDestination);
+            CHECK_GL_ERROR();
+            mnSourceMode = nSource;
+            mnDestinationMode = nDestination;
+        }
+    }
+};
+
+class RenderState
+{
+    TextureState maTexture;
+    ScissorState maScissor;
+    StencilState maStencil;
+    BlendState   maBlend;
+
+    tools::Rectangle maCurrentViewport;
+
+public:
+    RenderState()
+    {}
+
+    void viewport(tools::Rectangle aViewPort)
+    {
+        if (aViewPort != maCurrentViewport)
+        {
+            glViewport(aViewPort.Left(), aViewPort.Top(), aViewPort.GetWidth(), aViewPort.GetHeight());
+            CHECK_GL_ERROR();
+            maCurrentViewport = aViewPort;
+        }
+    }
+
+    TextureState& texture() { return maTexture; }
+    ScissorState& scissor() { return maScissor; }
+    StencilState& stencil() { return maStencil; }
+    BlendState&   blend()   { return maBlend; }
+
+    void sync()
+    {
+        VCL_GL_INFO("RenderState::sync");
+        maScissor.sync();
+        maStencil.sync();
+        maBlend.sync();
+    }
+};
+
+#endif // INCLUDED_VCL_INC_OPENGL_RENDER_STATE_H
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/vcl/inc/opengl/TextureState.hxx b/vcl/inc/opengl/TextureState.hxx
new file mode 100644
index 000000000..fbf2b9cee
--- /dev/null
+++ b/vcl/inc/opengl/TextureState.hxx
@@ -0,0 +1,76 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ */
+
+#ifndef INCLUDED_VCL_INC_OPENGL_TEXTURE_STATE_H
+#define INCLUDED_VCL_INC_OPENGL_TEXTURE_STATE_H
+
+#include <vcl/opengl/OpenGLHelper.hxx>
+
+class TextureState
+{
+private:
+    GLuint mnCurrentTextureUnit;
+    std::vector<GLuint> maBoundTextures;
+
+public:
+    TextureState()
+        : mnCurrentTextureUnit(0)
+        , maBoundTextures(4, 0)
+    {}
+
+    static void generate(GLuint& nTexture)
+    {
+        glGenTextures(1, &nTexture);
+        CHECK_GL_ERROR();
+    }
+
+    void active(GLuint nTextureUnit)
+    {
+        if (mnCurrentTextureUnit != nTextureUnit)
+        {
+            glActiveTexture(GL_TEXTURE0 + nTextureUnit);
+            CHECK_GL_ERROR();
+            mnCurrentTextureUnit = nTextureUnit;
+        }
+
+    }
+
+    void bind(GLuint nTexture)
+    {
+        if (maBoundTextures[mnCurrentTextureUnit] != nTexture)
+        {
+            glBindTexture(GL_TEXTURE_2D, nTexture);
+            CHECK_GL_ERROR();
+            maBoundTextures[mnCurrentTextureUnit] = nTexture;
+        }
+    }
+
+    void unbindAndDelete(GLuint nTexture)
+    {
+        unbind(nTexture);
+        glDeleteTextures(1, &nTexture);
+    }
+
+    void unbind(GLuint nTexture)
+    {
+        for (size_t i = 0; i < maBoundTextures.size(); i++)
+        {
+            if (nTexture == maBoundTextures[i])
+                maBoundTextures[i] = 0;
+        }
+    }
+
+};
+
+
+
+#endif // INCLUDED_VCL_INC_OPENGL_TEXTURE_STATE_H
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/vcl/inc/opengl/VertexUtils.hxx b/vcl/inc/opengl/VertexUtils.hxx
new file mode 100644
index 000000000..910b8725a
--- /dev/null
+++ b/vcl/inc/opengl/VertexUtils.hxx
@@ -0,0 +1,120 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ */
+
+#ifndef INCLUDED_VCL_INC_OPENGL_VERTEXUTILS_H
+#define INCLUDED_VCL_INC_OPENGL_VERTEXUTILS_H
+
+#include <basegfx/numeric/ftools.hxx>
+#include <epoxy/gl.h>
+#include <glm/gtx/norm.hpp>
+#include <tools/color.hxx>
+#include <vector>
+
+namespace vcl
+{
+namespace vertex
+{
+
+template<GLenum TYPE>
+inline void addRectangle(std::vector<GLfloat>& rVertices, GLfloat x1, GLfloat y1, GLfloat x2, GLfloat y2);
+
+template<>
+inline void addRectangle<GL_TRIANGLES>(std::vector<GLfloat>& rVertices, GLfloat x1, GLfloat y1, GLfloat x2, GLfloat y2)
+{
+    rVertices.insert(rVertices.end(), {
+        x1, y1, x2, y1, x1, y2,
+        x1, y2, x2, y1, x2, y2
+    });
+}
+
+template<>
+inline void addRectangle<GL_TRIANGLE_FAN>(std::vector<GLfloat>& rVertices, GLfloat x1, GLfloat y1, GLfloat x2, GLfloat y2)
+{
+    rVertices.insert(rVertices.end(), {
+        x1, y2, x1, y1,
+        x2, y1, x2, y2
+    });
+}
+
+inline void createColor(Color nColor, GLfloat fTransparency, GLubyte& nR, GLubyte& nG, GLubyte& nB, GLubyte& nA)
+{
+    nR = nColor.GetRed();
+    nG = nColor.GetGreen();
+    nB = nColor.GetBlue();
+    nA = (1.0f - fTransparency) * 255.0f;
+}
+
+template<GLenum TYPE>
+inline void addQuadColors(std::vector<GLubyte>& rColors, Color nColor, GLfloat fTransparency);
+
+template<>
+inline void addQuadColors<GL_TRIANGLES>(std::vector<GLubyte>& rColors, Color nColor, GLfloat fTransparency)
+{
+    GLubyte nR, nG, nB, nA;
+    createColor(nColor, fTransparency, nR, nG, nB, nA);
+
+    rColors.insert(rColors.end(), {
+        nR, nG, nB, nA,
+        nR, nG, nB, nA,
+        nR, nG, nB, nA,
+        nR, nG, nB, nA,
+        nR, nG, nB, nA,
+        nR, nG, nB, nA,
+    });
+}
+
+inline void addLineSegmentVertices(std::vector<GLfloat>& rVertices, std::vector<GLfloat>& rExtrusionVectors,
+                                   glm::vec2 prevPoint, glm::vec2 prevExtrusionVector, GLfloat prevLength,
+                                   glm::vec2 currPoint, glm::vec2 currExtrusionVector, GLfloat currLength)
+{
+    rVertices.insert(rVertices.end(), {
+        prevPoint.x, prevPoint.y,
+        prevPoint.x, prevPoint.y,
+        currPoint.x, currPoint.y,
+        currPoint.x, currPoint.y,
+        prevPoint.x, prevPoint.y,
+        currPoint.x, currPoint.y,
+    });
+
+    rExtrusionVectors.insert(rExtrusionVectors.end(), {
+        -prevExtrusionVector.x, -prevExtrusionVector.y, -prevLength,
+         prevExtrusionVector.x,  prevExtrusionVector.y,  prevLength,
+        -currExtrusionVector.x, -currExtrusionVector.y, -currLength,
+        -currExtrusionVector.x, -currExtrusionVector.y, -currLength,
+         prevExtrusionVector.x,  prevExtrusionVector.y,  prevLength,
+         currExtrusionVector.x,  currExtrusionVector.y,  currLength,
+    });
+}
+
+inline glm::vec2 normalize(const glm::vec2& vector)
+{
+    if (glm::length(vector) > 0.0)
+        return glm::normalize(vector);
+    return vector;
+}
+
+inline glm::vec2 perpendicular(const glm::vec2& vector)
+{
+    return glm::vec2(-vector.y, vector.x);
+}
+
+inline float lineVectorAngle(const glm::vec2& previous, const glm::vec2& next)
+{
+    float angle = std::atan2(previous.x * next.y - previous.y * next.x,
+                             previous.x * next.x + previous.y * next.y);
+
+    return F_PI - std::fabs(angle);
+}
+
+}} // end vcl::vertex
+
+#endif // INCLUDED_VCL_INC_OPENGL_VERTEXUTILS_H
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/vcl/inc/opengl/framebuffer.hxx b/vcl/inc/opengl/framebuffer.hxx
new file mode 100644
index 000000000..4445e6198
--- /dev/null
+++ b/vcl/inc/opengl/framebuffer.hxx
@@ -0,0 +1,48 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+#ifndef INCLUDED_VCL_INC_OPENGL_FRAMEBUFFER_H
+#define INCLUDED_VCL_INC_OPENGL_FRAMEBUFFER_H
+
+#include <vcl/dllapi.h>
+
+#include <opengl/texture.hxx>
+
+class OpenGLFramebuffer final
+{
+private:
+    GLuint      mnId;
+    int         mnWidth;
+    int         mnHeight;
+    GLuint      mnAttachedTexture;
+
+public:
+    OpenGLFramebuffer();
+    ~OpenGLFramebuffer();
+
+    int     GetWidth() const { return mnWidth; };
+    int     GetHeight() const { return mnHeight; };
+
+    void    Bind(GLenum eTarget = GL_FRAMEBUFFER);
+
+    static void Unbind(GLenum eTarget = GL_FRAMEBUFFER);
+
+    VCL_DLLPUBLIC bool IsFree() const;
+    bool    IsAttached( GLuint nTexture ) const;
+    bool    IsAttached( const OpenGLTexture& rTexture ) const;
+    void    AttachTexture( const OpenGLTexture& rTexture );
+    void    DetachTexture();
+
+public:
+    OpenGLFramebuffer* mpPrevFramebuffer;
+};
+
+#endif // INCLUDED_VCL_INC_OPENGL_FRAMEBUFFER_H
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/vcl/inc/opengl/gdiimpl.hxx b/vcl/inc/opengl/gdiimpl.hxx
new file mode 100644
index 000000000..a6de106a6
--- /dev/null
+++ b/vcl/inc/opengl/gdiimpl.hxx
@@ -0,0 +1,395 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * This file incorporates work covered by the following license notice:
+ *
+ *   Licensed to the Apache Software Foundation (ASF) under one or more
+ *   contributor license agreements. See the NOTICE file distributed
+ *   with this work for additional information regarding copyright
+ *   ownership. The ASF licenses this file to you under the Apache
+ *   License, Version 2.0 (the "License"); you may not use this file
+ *   except in compliance with the License. You may obtain a copy of
+ *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
+ */
+
+#ifndef INCLUDED_VCL_OPENGLGDIIMPL_HXX
+#define INCLUDED_VCL_OPENGLGDIIMPL_HXX
+
+#include <vcl/dllapi.h>
+#include <vcl/opengl/OpenGLContext.hxx>
+
+#include <regionband.hxx>
+#include <salgeom.hxx>
+#include <salgdiimpl.hxx>
+#include <opengl/program.hxx>
+#include <opengl/texture.hxx>
+#include <opengl/RenderList.hxx>
+
+#include <memory>
+
+class SalFrame;
+class SalVirtualDevice;
+class OpenGLTests;
+
+namespace basegfx
+{
+class B2DTrapezoid;
+};
+
+namespace tools
+{
+    class Polygon;
+    class PolyPolygon;
+}
+
+struct TextureCombo
+{
+    std::unique_ptr<OpenGLTexture> mpTexture;
+    std::unique_ptr<OpenGLTexture> mpMask;
+};
+
+class OpenGLFlushIdle;
+
+class VCL_DLLPUBLIC OpenGLSalGraphicsImpl : public SalGraphicsImpl
+{
+    friend class OpenGLTests;
+protected:
+
+    /// This context is solely for blitting maOffscreenTex
+    rtl::Reference<OpenGLContext> mpWindowContext;
+
+    /// This context is whatever is most convenient to render
+    /// to maOffscreenTex with.
+    rtl::Reference<OpenGLContext> mpContext;
+
+    SalGraphics& mrParent;
+    /// Pointer to the SalFrame or SalVirtualDevice
+    SalGeometryProvider* mpProvider;
+    OpenGLProgram* mpProgram;
+
+    /// This idle handler is used to swap buffers after rendering.
+    std::unique_ptr<OpenGLFlushIdle> mpFlush;
+
+    // clipping
+    vcl::Region maClipRegion;
+    bool mbUseScissor;
+    bool mbUseStencil;
+
+    bool mbXORMode;
+
+    bool mbAcquiringOpenGLContext;
+
+    /**
+     * All rendering happens to this off-screen texture. For
+     * non-virtual devices, ie. windows - we will blit it and
+     * swapBuffers later.
+     */
+    OpenGLTexture maOffscreenTex;
+
+    Color mnLineColor;
+    Color mnFillColor;
+#ifdef DBG_UTIL
+    bool mProgramIsSolidColor;
+#endif
+    sal_uInt32 mnDrawCount;
+    sal_uInt32 mnDrawCountAtFlush;
+    Color mProgramSolidColor;
+    double mProgramSolidTransparency;
+
+    std::unique_ptr<RenderList> mpRenderList;
+
+    void ImplInitClipRegion();
+    void ImplSetClipBit( const vcl::Region& rClip, GLuint nMask );
+    void ImplDrawLineAA( double nX1, double nY1, double nX2, double nY2, bool edge );
+    void CheckOffscreenTexture();
+
+    void ApplyProgramMatrices(float fPixelOffset = 0.0);
+
+public:
+    bool UseProgram( const OUString& rVertexShader, const OUString& rFragmentShader, const OString& preamble = "" );
+    bool UseSolid( Color nColor, sal_uInt8 nTransparency );
+    bool UseSolid( Color nColor, double fTransparency );
+    bool UseSolid( Color nColor );
+    void UseSolid();
+    bool UseLine(Color nColor, double fTransparency, GLfloat fLineWidth, bool bUseAA);
+    void UseLine(GLfloat fLineWidth, bool bUseAA);
+    bool UseInvert50();
+    bool UseInvert(SalInvert nFlags);
+
+    void DrawConvexPolygon( sal_uInt32 nPoints, const SalPoint* pPtAry, bool blockAA = false );
+    void DrawConvexPolygon( const tools::Polygon& rPolygon, bool blockAA );
+    void DrawTrapezoid( const basegfx::B2DTrapezoid& trapezoid, bool blockAA );
+    void DrawRect( long nX, long nY, long nWidth, long nHeight );
+    void DrawRect( const tools::Rectangle& rRect );
+    void DrawPolygon( sal_uInt32 nPoints, const SalPoint* pPtAry );
+    void DrawLineSegment(float x1, float y1, float x2, float y2);
+    void DrawPolyPolygon( const basegfx::B2DPolyPolygon& rPolyPolygon, bool blockAA = false );
+    void DrawRegionBand( const RegionBand& rRegion );
+    void DrawTextureRect( const SalTwoRect& rPosAry );
+    void DrawTexture( OpenGLTexture& rTexture, const SalTwoRect& rPosAry, bool bInverted = false );
+    void DrawTransformedTexture( OpenGLTexture& rTexture, OpenGLTexture& rMask, const basegfx::B2DPoint& rNull, const basegfx::B2DPoint& rX, const basegfx::B2DPoint& rY );
+    void DrawAlphaTexture( OpenGLTexture& rTexture, const SalTwoRect& rPosAry, bool bInverted, bool pPremultiplied );
+    void DrawTextureDiff( OpenGLTexture& rTexture, OpenGLTexture& rMask, const SalTwoRect& rPosAry, bool bInverted );
+    void DrawTextureWithMask( OpenGLTexture& rTexture, OpenGLTexture& rMask, const SalTwoRect& rPosAry );
+    void DrawBlendedTexture( OpenGLTexture& rTexture, OpenGLTexture& rMask, OpenGLTexture& rAlpha, const SalTwoRect& rPosAry );
+    void DrawMask( OpenGLTexture& rTexture, Color nMaskColor, const SalTwoRect& rPosAry );
+    void DrawLinearGradient( const Gradient& rGradient, const tools::Rectangle& rRect );
+    void DrawAxialGradient( const Gradient& rGradient, const tools::Rectangle& rRect );
+    void DrawRadialGradient( const Gradient& rGradient, const tools::Rectangle& rRect );
+
+    void FlushDeferredDrawing();
+    void FlushLinesOrTriangles(DrawShaderType eType, RenderParameters const & rParameters);
+
+public:
+    // get the width of the device
+    GLfloat GetWidth() const { return mpProvider ? mpProvider->GetWidth() : 1; }
+
+    // get the height of the device
+    GLfloat GetHeight() const { return mpProvider ? mpProvider->GetHeight() : 1; }
+
+    /**
+     * check whether this instance is used for offscreen (Virtual Device)
+     * rendering ie. does it need its own context.
+     */
+    bool IsOffscreen() const { return mpProvider == nullptr || mpProvider->IsOffScreen(); }
+
+    /// Oddly not all operations obey the XOR option.
+    enum XOROption { IGNORE_XOR, IMPLEMENT_XOR };
+
+    // initialize pre-draw state
+    void InitializePreDrawState(XOROption eOpt);
+
+    // operations to do before painting
+    void PreDraw(XOROption eOpt = IGNORE_XOR);
+
+    // operations to do after painting
+    void PostDraw();
+
+    void PostBatchDraw();
+
+protected:
+    bool AcquireContext(bool bForceCreate = false);
+    void ReleaseContext();
+
+    /// create a new context for rendering to the underlying window
+    virtual rtl::Reference<OpenGLContext> CreateWinContext() = 0;
+
+    /// check whether the given context can be used for off-screen rendering
+    static bool UseContext( const rtl::Reference<OpenGLContext> &pContext )
+    {
+        return pContext->isInitialized() &&  // not released by the OS etc.
+               pContext->isVCLOnly();
+    }
+
+public:
+    OpenGLSalGraphicsImpl(SalGraphics& pParent, SalGeometryProvider *pProvider);
+    virtual ~OpenGLSalGraphicsImpl () override;
+
+    rtl::Reference<OpenGLContext> GetOpenGLContext();
+
+    virtual void Init() override;
+
+    virtual void DeInit() override;
+
+    virtual void freeResources() override;
+
+    virtual OUString getRenderBackendName() const override { return "opengl"; }
+
+    const vcl::Region& getClipRegion() const;
+    virtual bool setClipRegion( const vcl::Region& ) override;
+
+    //
+    // get the depth of the device
+    virtual sal_uInt16 GetBitCount() const override;
+
+    // get the width of the device
+    virtual long GetGraphicsWidth() const override;
+
+    // set the clip region to empty
+    virtual void ResetClipRegion() override;
+
+    // set the line color to transparent (= don't draw lines)
+
+    virtual void SetLineColor() override;
+
+    // set the line color to a specific color
+    virtual void SetLineColor( Color nColor ) override;
+
+    // set the fill color to transparent (= don't fill)
+    virtual void SetFillColor() override;
+
+    // set the fill color to a specific color, shapes will be
+    // filled accordingly
+    virtual void SetFillColor( Color nColor ) override;
+
+    // enable/disable XOR drawing
+    virtual void SetXORMode( bool bSet, bool bInvertOnly ) override;
+
+    // set line color for raster operations
+    virtual void SetROPLineColor( SalROPColor nROPColor ) override;
+
+    // set fill color for raster operations
+    virtual void SetROPFillColor( SalROPColor nROPColor ) override;
+
+    // draw --> LineColor and FillColor and RasterOp and ClipRegion
+    virtual void drawPixel( long nX, long nY ) override;
+    virtual void drawPixel( long nX, long nY, Color nColor ) override;
+
+    virtual void drawLine( long nX1, long nY1, long nX2, long nY2 ) override;
+
+    virtual void drawRect( long nX, long nY, long nWidth, long nHeight ) override;
+
+    virtual void drawPolyLine( sal_uInt32 nPoints, const SalPoint* pPtAry ) override;
+
+    virtual void drawPolygon( sal_uInt32 nPoints, const SalPoint* pPtAry ) override;
+
+    virtual void drawPolyPolygon( sal_uInt32 nPoly, const sal_uInt32* pPoints, PCONSTSALPOINT* pPtAry ) override;
+
+    virtual bool drawPolyPolygon(
+                const basegfx::B2DHomMatrix& rObjectToDevice,
+                const basegfx::B2DPolyPolygon&,
+                double fTransparency) override;
+
+    virtual bool drawPolyLine(
+                const basegfx::B2DHomMatrix& rObjectToDevice,
+                const basegfx::B2DPolygon&,
+                double fTransparency,
+                double fLineWidth,
+                const std::vector< double >* pStroke, // MM01
+                basegfx::B2DLineJoin,
+                css::drawing::LineCap,
+                double fMiterMinimumAngle,
+                bool bPixelSnapHairline) override;
+
+    virtual bool drawPolyLineBezier(
+                sal_uInt32 nPoints,
+                const SalPoint* pPtAry,
+                const PolyFlags* pFlgAry ) override;
+
+    virtual bool drawPolygonBezier(
+                sal_uInt32 nPoints,
+                const SalPoint* pPtAry,
+                const PolyFlags* pFlgAry ) override;
+
+    virtual bool drawPolyPolygonBezier(
+                sal_uInt32 nPoly,
+                const sal_uInt32* pPoints,
+                const SalPoint* const* pPtAry,
+                const PolyFlags* const* pFlgAry ) override;
+
+    // CopyArea --> No RasterOp, but ClipRegion
+    virtual void copyArea(
+                long nDestX, long nDestY,
+                long nSrcX, long nSrcY,
+                long nSrcWidth, long nSrcHeight,
+                bool bWindowInvalidate ) override;
+
+    // CopyBits and DrawBitmap --> RasterOp and ClipRegion
+    // CopyBits() --> pSrcGraphics == NULL, then CopyBits on same Graphics
+    void DoCopyBits(const SalTwoRect& rPosAry, OpenGLSalGraphicsImpl &rSrcImpl);
+
+    virtual bool blendBitmap(
+                const SalTwoRect&,
+                const SalBitmap& rBitmap ) override;
+
+    virtual bool blendAlphaBitmap(
+                const SalTwoRect&,
+                const SalBitmap& rSrcBitmap,
+                const SalBitmap& rMaskBitmap,
+                const SalBitmap& rAlphaBitmap ) override;
+
+    virtual void drawBitmap( const SalTwoRect& rPosAry, const SalBitmap& rSalBitmap ) override;
+
+    virtual void drawBitmap(
+                const SalTwoRect& rPosAry,
+                const SalBitmap& rSalBitmap,
+                const SalBitmap& rMaskBitmap ) override;
+
+    virtual void drawMask(
+                const SalTwoRect& rPosAry,
+                const SalBitmap& rSalBitmap,
+                Color nMaskColor ) override;
+
+    virtual std::shared_ptr<SalBitmap> getBitmap( long nX, long nY, long nWidth, long nHeight ) override;
+
+    virtual Color getPixel( long nX, long nY ) override;
+
+    // invert --> ClipRegion (only Windows or VirDevs)
+    virtual void invert(
+                long nX, long nY,
+                long nWidth, long nHeight,
+                SalInvert nFlags) override;
+
+    virtual void invert( sal_uInt32 nPoints, const SalPoint* pPtAry, SalInvert nFlags ) override;
+
+    virtual bool drawEPS(
+                long nX, long nY,
+                long nWidth, long nHeight,
+                void* pPtr,
+                sal_uInt32 nSize ) override;
+
+    /** Render bitmap with alpha channel
+
+        @param rSourceBitmap
+        Source bitmap to blit
+
+        @param rAlphaBitmap
+        Alpha channel to use for blitting
+
+        @return true, if the operation succeeded, and false
+        otherwise. In this case, clients should try to emulate alpha
+        compositing themselves
+     */
+    virtual bool drawAlphaBitmap(
+                const SalTwoRect&,
+                const SalBitmap& rSourceBitmap,
+                const SalBitmap& rAlphaBitmap ) override;
+
+    /** draw transformed bitmap (maybe with alpha) where Null, X, Y define the coordinate system */
+    virtual bool drawTransformedBitmap(
+                const basegfx::B2DPoint& rNull,
+                const basegfx::B2DPoint& rX,
+                const basegfx::B2DPoint& rY,
+                const SalBitmap& rSourceBitmap,
+                const SalBitmap* pAlphaBitmap) override;
+
+    /** Render solid rectangle with given transparency
+
+      @param nX             Top left coordinate of rectangle
+
+      @param nY             Bottom right coordinate of rectangle
+
+      @param nWidth         Width of rectangle
+
+      @param nHeight        Height of rectangle
+
+      @param nTransparency  Transparency value (0-255) to use. 0 blits and opaque, 255 a
+                            fully transparent rectangle
+
+      @returns true if successfully drawn, false if not able to draw rectangle
+     */
+    virtual bool drawAlphaRect(
+                    long nX, long nY,
+                    long nWidth, long nHeight,
+                    sal_uInt8 nTransparency ) override;
+
+    virtual bool drawGradient(const tools::PolyPolygon& rPolygon, const Gradient& rGradient) override;
+
+    virtual bool supportsOperation(OutDevSupportType eType) const override;
+
+    /// queue an idle flush of contents of the back-buffer to the screen
+    void flush();
+
+public:
+    /// do flush of contents of the back-buffer to the screen & swap.
+    void doFlush();
+};
+
+#endif
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/vcl/inc/opengl/program.hxx b/vcl/inc/opengl/program.hxx
new file mode 100644
index 000000000..bff248d9b
--- /dev/null
+++ b/vcl/inc/opengl/program.hxx
@@ -0,0 +1,122 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+#ifndef INCLUDED_VCL_INC_OPENGL_PROGRAM_H
+#define INCLUDED_VCL_INC_OPENGL_PROGRAM_H
+
+#include <sal/config.h>
+
+#include <vector>
+
+#include <vcl/dllapi.h>
+
+#include <basegfx/point/b2dpoint.hxx>
+#include <rtl/ustring.hxx>
+#include <opengl/texture.hxx>
+
+#include <unordered_map>
+
+class Color;
+
+enum class TextureShaderType
+{
+    Normal = 0,
+    Blend,
+    Masked,
+    Diff,
+    MaskedColor
+};
+
+enum class DrawShaderType
+{
+    Normal = 0,
+    Line
+};
+
+class OpenGLProgram
+{
+private:
+    GLuint          mnId;
+    std::unordered_map< OString, GLuint >
+                    maUniformLocations;
+    sal_uInt32      mnEnabledAttribs;
+    GLuint          mnPositionAttrib;
+    GLuint          mnTexCoordAttrib;
+    GLuint          mnAlphaCoordAttrib;
+    GLuint          mnMaskCoordAttrib;
+    GLuint          mnExtrusionVectorsAttrib;
+    GLuint          mnVertexColorsAttrib;
+
+    std::vector< OpenGLTexture >     maTextures;
+    bool            mbBlending;
+
+    float mfLastWidth;
+    float mfLastHeight;
+    float mfLastPixelOffset;
+
+
+    OpenGLProgram(const OpenGLProgram &) = delete;
+public:
+    OpenGLProgram();
+    ~OpenGLProgram();
+
+    GLuint Id() { return mnId; }
+
+    bool Load( const OUString& rVertexShader, const OUString& rFragmentShader,
+               const OString& preamble, const OString& rDigest );
+    void Use();
+    void Reuse();
+    void Clean();
+
+    void SetVertices( const GLvoid* pData );
+    void SetTextureCoord( const GLvoid* pData );
+    void SetAlphaCoord( const GLvoid* pData );
+    void SetMaskCoord(const GLvoid* pData);
+    void SetExtrusionVectors(const GLvoid* pData);
+    void SetVertexColors(std::vector<GLubyte>& rColorVector);
+
+    void SetUniform1f( const OString& rName, GLfloat v1 );
+    void SetUniform2f( const OString& rName, GLfloat v1, GLfloat v2 );
+    void SetUniform1fv( const OString& rName, GLsizei nCount, GLfloat const * aValues );
+    void SetUniform2fv( const OString& rName, GLsizei nCount, GLfloat const * aValues );
+    void SetUniform1i( const OString& rName, GLint v1 );
+    void SetColor( const OString& rName, const Color& rColor );
+    void SetColor( const OString& rName, Color nColor, sal_uInt8 nTransparency );
+    void SetColorf( const OString& rName, Color nColor, double fTransparency );
+    void SetColorWithIntensity( const OString& rName, const Color& rColor, long nFactor );
+    void SetTexture( const OString& rName, OpenGLTexture& rTexture );
+    void SetTransform( const OString& rName, const OpenGLTexture& rTexture,
+                       const basegfx::B2DPoint& rNull, const basegfx::B2DPoint& rX,
+                       const basegfx::B2DPoint& rY );
+    void SetIdentityTransform(const OString& rName);
+    void SetShaderType(TextureShaderType eTextureShaderType);
+    void SetShaderType(DrawShaderType eDrawShaderType);
+
+    void SetBlendMode( GLenum nSFactor, GLenum nDFactor );
+
+    void ApplyMatrix(float fWidth, float fHeight, float fPixelOffset = 0.0f);
+
+    void DrawTexture( const OpenGLTexture& rTexture );
+
+    void DrawArrays(GLenum aMode, std::vector<GLfloat>& aVertices);
+    void DrawElements(GLenum aMode, GLuint nNumberOfVertices);
+
+    bool EnableVertexAttrib(GLuint& rAttrib, const OString& rName);
+
+    void SetVertexAttrib(GLuint& rAttrib, const OString& rName, GLint nSize,
+                         GLenum eType, GLboolean bNormalized, GLsizei aStride,
+                         const GLvoid* pPointer);
+
+private:
+    GLuint GetUniformLocation( const OString& rName );
+};
+
+#endif // INCLUDED_VCL_INC_OPENGL_PROGRAM_H
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/vcl/inc/opengl/salbmp.hxx b/vcl/inc/opengl/salbmp.hxx
new file mode 100644
index 000000000..a01eca89f
--- /dev/null
+++ b/vcl/inc/opengl/salbmp.hxx
@@ -0,0 +1,113 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * This file incorporates work covered by the following license notice:
+ *
+ *   Licensed to the Apache Software Foundation (ASF) under one or more
+ *   contributor license agreements. See the NOTICE file distributed
+ *   with this work for additional information regarding copyright
+ *   ownership. The ASF licenses this file to you under the Apache
+ *   License, Version 2.0 (the "License"); you may not use this file
+ *   except in compliance with the License. You may obtain a copy of
+ *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
+ */
+
+#ifndef INCLUDED_VCL_INC_OPENGL_SALBMP_H
+#define INCLUDED_VCL_INC_OPENGL_SALBMP_H
+
+#include <vcl/opengl/OpenGLContext.hxx>
+
+#include <opengl/texture.hxx>
+
+#include <salbmp.hxx>
+
+#include <memory>
+
+struct  BitmapBuffer;
+class   BitmapPalette;
+namespace vcl
+{
+    class Kernel;
+}
+
+class VCL_PLUGIN_PUBLIC OpenGLSalBitmap final : public SalBitmap
+{
+private:
+    OpenGLTexture                       maTexture;
+    bool                                mbDirtyTexture;
+    BitmapPalette                       maPalette;
+    std::shared_ptr<sal_uInt8>          mpUserBuffer;
+    sal_uInt16                          mnBits;
+    sal_uInt32                          mnBytesPerRow;
+    int                                 mnWidth;
+    int                                 mnHeight;
+
+    virtual void updateChecksum() const override;
+
+    bool calcChecksumGL(OpenGLTexture& rInputTexture, BitmapChecksum& rChecksum) const;
+
+public:
+    OpenGLSalBitmap();
+    virtual ~OpenGLSalBitmap() override;
+
+public:
+
+    // SalBitmap methods
+    bool            Create( const Size& rSize, sal_uInt16 nBitCount, const BitmapPalette& rPal ) override;
+    bool            Create( const SalBitmap& rSalBmp ) override;
+    bool            Create( const SalBitmap& rSalBmp, SalGraphics* pGraphics ) override;
+    bool            Create( const SalBitmap& rSalBmp, sal_uInt16 nNewBitCount ) override;
+    virtual bool    Create( const css::uno::Reference< css::rendering::XBitmapCanvas >& rBitmapCanvas,
+                            Size& rSize,
+                            bool bMask = false ) override;
+
+    void            Destroy() final override;
+
+    Size            GetSize() const override;
+    sal_uInt16      GetBitCount() const override;
+
+    BitmapBuffer*   AcquireBuffer( BitmapAccessMode nMode ) override;
+    void            ReleaseBuffer( BitmapBuffer* pBuffer, BitmapAccessMode nMode ) override;
+
+    bool            GetSystemData( BitmapSystemData& rData ) override;
+
+    bool            ScalingSupported() const override;
+    bool            Scale( const double& rScaleX, const double& rScaleY, BmpScaleFlag nScaleFlag ) override;
+    bool            Replace( const Color& rSearchColor, const Color& rReplaceColor, sal_uInt8 nTol ) override;
+    bool            ConvertToGreyscale() override;
+    bool            InterpretAs8Bit() override;
+
+public:
+
+    void            Create( const OpenGLTexture& rTex, long nX, long nY, long nWidth, long nHeight );
+    OpenGLTexture&  GetTexture() const;
+    const BitmapPalette& GetBitmapPalette() const { return maPalette; }
+
+private:
+
+    GLuint          CreateTexture();
+    bool            AllocateUserData();
+    void            DeallocateUserData();
+    bool            ReadTexture();
+
+private:
+
+    bool ImplScaleFilter( const rtl::Reference< OpenGLContext > &xContext, const double& rScaleX, const double& rScaleY, GLenum nFilter );
+    static void ImplCreateKernel( const double& fScale, const vcl::Kernel& rKernel, GLfloat*& pWeights, sal_uInt32& aKernelSize );
+    bool ImplScaleConvolution(const rtl::Reference< OpenGLContext > &xContext, const double& rScaleX, const double& rScaleY, const vcl::Kernel& rKernel);
+    bool ImplScaleArea( const rtl::Reference< OpenGLContext > &xContext,
+                        double rScaleX, double rScaleY );
+
+public:
+
+    void ImplScale( const double& rScaleX, const double& rScaleY, BmpScaleFlag nScaleFlag );
+};
+
+#endif // INCLUDED_VCL_INC_OPENGL_SALBMP_H
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/vcl/inc/opengl/texture.hxx b/vcl/inc/opengl/texture.hxx
new file mode 100644
index 000000000..0438b9af1
--- /dev/null
+++ b/vcl/inc/opengl/texture.hxx
@@ -0,0 +1,139 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * This file incorporates work covered by the following license notice:
+ *
+ *   Licensed to the Apache Software Foundation (ASF) under one or more
+ *   contributor license agreements. See the NOTICE file distributed
+ *   with this work for additional information regarding copyright
+ *   ownership. The ASF licenses this file to you under the Apache
+ *   License, Version 2.0 (the "License"); you may not use this file
+ *   except in compliance with the License. You may obtain a copy of
+ *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
+ */
+
+#ifndef INCLUDED_VCL_INC_OPENGL_TEXTURE_H
+#define INCLUDED_VCL_INC_OPENGL_TEXTURE_H
+
+#include <epoxy/gl.h>
+#include <vcl/dllapi.h>
+#include <vcl/salgtype.hxx>
+#include <rtl/ustring.hxx>
+#include <tools/gen.hxx>
+
+#include <functional>
+#include <memory>
+#include <vector>
+
+class ImplOpenGLTexture
+{
+public:
+    GLuint mnTexture;
+    int    mnWidth;
+    int    mnHeight;
+    GLenum mnFilter;
+    GLuint mnOptStencil;
+
+    std::unique_ptr<std::vector<int>> mpSlotReferences;
+    std::function<void(int)> mFunctSlotDeallocateCallback;
+
+    ImplOpenGLTexture( int nWidth, int nHeight, bool bAllocate );
+    ImplOpenGLTexture( int nWidth, int nHeight, int nFormat, int nType, void const * pData );
+    ImplOpenGLTexture( int nX, int nY, int nWidth, int nHeight );
+    ~ImplOpenGLTexture();
+
+    bool InsertBuffer(int nX, int nY, int nWidth, int nHeight, int nFormat, int nType, sal_uInt8 const * pData);
+
+    void IncreaseRefCount(int nSlotNumber);
+    void DecreaseRefCount(int nSlotNumber);
+
+    void InitializeSlotMechanism(int nInitialSlotSize);
+
+    void SetSlotDeallocateCallback(std::function<void(int)> aCallback)
+    {
+        mFunctSlotDeallocateCallback = aCallback;
+    }
+
+    void ResetSlotDeallocateCallback()
+    {
+        mFunctSlotDeallocateCallback = std::function<void(int)>();
+    }
+
+    GLuint AddStencil();
+};
+
+class VCL_DLLPUBLIC OpenGLTexture final
+{
+private:
+    // if the rect size doesn't match the mpImpl one, this instance
+    // is a sub-area from the real OpenGL texture
+    tools::Rectangle maRect;
+    std::shared_ptr<ImplOpenGLTexture> mpImpl;
+    int mnSlotNumber;
+
+    inline void GetTextureRect(const SalTwoRect& rPosAry, GLfloat& x1, GLfloat& x2, GLfloat& y1, GLfloat& y2) const;
+
+    bool IsValid() const
+    {
+        return (mpImpl && mpImpl->mnTexture != 0);
+    }
+
+public:
+                    OpenGLTexture();
+                    OpenGLTexture(const std::shared_ptr<ImplOpenGLTexture>& pImpl, tools::Rectangle aRectangle, int nSlotNumber);
+
+                    OpenGLTexture( int nWidth, int nHeight, bool bAllocate = true );
+                    OpenGLTexture( int nWidth, int nHeight, int nFormat, int nType, void const * pData );
+                    OpenGLTexture( int nX, int nY, int nWidth, int nHeight );
+                    OpenGLTexture( const OpenGLTexture& rTexture );
+                    OpenGLTexture( OpenGLTexture&& rTexture ) noexcept;
+                    OpenGLTexture( const OpenGLTexture& rTexture, int nX, int nY, int nWidth, int nHeight );
+                    ~OpenGLTexture();
+
+    bool            IsUnique() const;
+
+    GLuint          Id() const;
+    int             GetWidth() const;
+    int             GetHeight() const;
+
+    void            GetCoord( GLfloat* pCoord, const SalTwoRect& rPosAry, bool bInverted=false ) const;
+    void            GetWholeCoord( GLfloat* pCoord ) const;
+    void            Bind();
+    void            Unbind();
+    void            Read( GLenum nFormat, GLenum nType, sal_uInt8* pData );
+    GLuint          AddStencil();
+    GLuint          StencilId() const;
+
+    bool            CopyData(int nWidth, int nHeight, int nFormat, int nType, sal_uInt8 const * pData);
+
+    void            SaveToFile(const OUString& rFileName);
+
+    GLenum          GetFilter() const;
+    void            SetFilter( GLenum nFilter );
+
+                    operator bool() const;
+    OpenGLTexture&  operator=( const OpenGLTexture& rTexture );
+    OpenGLTexture&  operator=( OpenGLTexture&& rTexture );
+    bool            operator==( const OpenGLTexture& rTexture ) const;
+    bool            operator!=( const OpenGLTexture& rTexture ) const;
+
+    template<GLenum type>
+    void FillCoords(std::vector<GLfloat>& aCoordVector, const SalTwoRect& rPosAry) const;
+};
+
+template<> void OpenGLTexture::FillCoords<GL_TRIANGLES>(
+    std::vector<GLfloat>& aCoord, const SalTwoRect& rPosAry)
+    const;
+
+template<> void OpenGLTexture::FillCoords<GL_TRIANGLE_FAN>(
+    std::vector<GLfloat>& aCoord, const SalTwoRect& rPosAry)
+    const;
+
+#endif // INCLUDED_VCL_INC_OPENGL_TEXTURE_H
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/vcl/inc/opengl/win/WinDeviceInfo.hxx b/vcl/inc/opengl/win/WinDeviceInfo.hxx
new file mode 100644
index 000000000..04d97406b
--- /dev/null
+++ b/vcl/inc/opengl/win/WinDeviceInfo.hxx
@@ -0,0 +1,103 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+#ifndef INCLUDED_VCL_OPENGL_WIN_WINDEVICEINFO_HXX
+#define INCLUDED_VCL_OPENGL_WIN_WINDEVICEINFO_HXX
+
+#include <vcl/dllapi.h>
+
+#include <opengl/DeviceInfo.hxx>
+#include <driverblocklist.hxx>
+
+#include <rtl/ustring.hxx>
+#include <vector>
+#include <cstdint>
+
+class VCL_DLLPUBLIC WinOpenGLDeviceInfo : public OpenGLDeviceInfo
+{
+private:
+    OUString maDriverVersion;
+    OUString maDriverVersion2;
+
+    OUString maDriverDate;
+    OUString maDriverDate2;
+
+    OUString maDeviceID;
+    OUString maDeviceID2;
+
+    OUString maAdapterVendorID;
+    OUString maAdapterDeviceID;
+    OUString maAdapterSubsysID;
+
+    OUString maAdapterVendorID2;
+    OUString maAdapterDeviceID2;
+    OUString maAdapterSubsysID2;
+
+    OUString maDeviceKey;
+    OUString maDeviceKey2;
+
+    OUString maDeviceString;
+    OUString maDeviceString2;
+
+    bool mbHasDualGPU;
+    bool mbRDP;
+
+    void GetData();
+    bool FindBlocklistedDeviceInList();
+
+public:
+    WinOpenGLDeviceInfo();
+
+    virtual ~WinOpenGLDeviceInfo() override;
+
+    virtual bool isDeviceBlocked() override;
+
+    const OUString& GetDriverVersion() const
+    {
+        return maDriverVersion;
+    }
+
+    const OUString& GetDriverDate() const
+    {
+        return maDriverDate;
+    }
+
+    const OUString& GetDeviceID() const
+    {
+        return maDeviceID;
+    }
+
+    const OUString& GetAdapterVendorID() const
+    {
+        return maAdapterVendorID;
+    }
+
+    const OUString& GetAdapterDeviceID() const
+    {
+        return maAdapterDeviceID;
+    }
+
+    const OUString& GetAdapterSubsysID() const
+    {
+        return maAdapterSubsysID;
+    }
+    const OUString& GetDeviceKey() const
+    {
+        return maDeviceKey;
+    }
+
+    const OUString& GetDeviceString() const
+    {
+        return maDeviceString;
+    }
+};
+
+#endif
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/vcl/inc/opengl/win/gdiimpl.hxx b/vcl/inc/opengl/win/gdiimpl.hxx
new file mode 100644
index 000000000..dff47ef7e
--- /dev/null
+++ b/vcl/inc/opengl/win/gdiimpl.hxx
@@ -0,0 +1,97 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+#ifndef INCLUDED_VCL_INC_OPENGL_WIN_GDIIMPL_HXX
+#define INCLUDED_VCL_INC_OPENGL_WIN_GDIIMPL_HXX
+
+#include <memory>
+#include <vcl/dllapi.h>
+
+#include <opengl/gdiimpl.hxx>
+#include <svdata.hxx>
+#include <win/salgdi.h>
+#include <win/wingdiimpl.hxx>
+#include <o3tl/lru_map.hxx>
+#include <vcl/opengl/OpenGLContext.hxx>
+#include <ControlCacheKey.hxx>
+
+class OpenGLCompatibleDC : public CompatibleDC
+{
+public:
+    OpenGLCompatibleDC(SalGraphics &rGraphics, int x, int y, int width, int height);
+
+    virtual std::unique_ptr<Texture> getAsMaskTexture() const override;
+    // caller must delete
+    OpenGLTexture* getOpenGLTexture() const;
+
+    /// Copy bitmap data to the texture. Texture must be initialized and the correct size to hold the bitmap.
+    bool copyToTexture(Texture& aTexture) const;
+
+    struct Texture;
+};
+
+struct OpenGLCompatibleDC::Texture : public CompatibleDC::Texture
+{
+    OpenGLTexture texture;
+    virtual bool isValid() const { return !!texture; }
+    virtual int GetWidth() const { return texture.GetWidth(); }
+    virtual int GetHeight() const { return texture.GetHeight(); }
+};
+
+class WinOpenGLSalGraphicsImpl : public OpenGLSalGraphicsImpl, public WinSalGraphicsImplBase
+{
+    friend class WinLayout;
+private:
+    WinSalGraphics& mrWinParent;
+
+    bool RenderCompatibleDC(OpenGLCompatibleDC& rWhite, OpenGLCompatibleDC& rBlack,
+                            int nX, int nY, TextureCombo& rCombo);
+
+public:
+    WinOpenGLSalGraphicsImpl(WinSalGraphics& rGraphics,
+                             SalGeometryProvider *mpProvider);
+
+protected:
+    virtual rtl::Reference<OpenGLContext> CreateWinContext() override;
+
+    bool RenderTextureCombo(TextureCombo const & rCombo, int nX, int nY);
+
+public:
+    virtual void Init() override;
+    virtual void copyBits( const SalTwoRect& rPosAry, SalGraphics* pSrcGraphics ) override;
+
+    virtual bool UseTextDraw() const override { return true; }
+    virtual void PreDrawText() override;
+    virtual void PostDrawText() override;
+    virtual void DrawTextMask( CompatibleDC::Texture* rTexture, Color nMaskColor, const SalTwoRect& rPosAry ) override;
+    using OpenGLSalGraphicsImpl::DrawMask;
+    virtual void DeferredTextDraw(const CompatibleDC::Texture* pTexture, Color nMaskColor, const SalTwoRect& rPosAry) override;
+
+    virtual bool UseRenderNativeControl() const override { return true; }
+    virtual bool TryRenderCachedNativeControl(ControlCacheKey const & rControlCacheKey, int nX, int nY) override;
+    virtual bool RenderAndCacheNativeControl(CompatibleDC& rWhite, CompatibleDC& rBlack,
+                                     int nX, int nY , ControlCacheKey& aControlCacheKey) override;
+
+};
+
+typedef std::pair<ControlCacheKey, std::unique_ptr<TextureCombo>> OpenGLControlCachePair;
+typedef o3tl::lru_map<ControlCacheKey, std::unique_ptr<TextureCombo>, ControlCacheHashFunction> OpenGLControlCacheType;
+
+class OpenGLControlsCache {
+    OpenGLControlCacheType cache;
+
+    OpenGLControlsCache();
+
+public:
+    static OpenGLControlCacheType & get();
+};
+
+#endif
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/vcl/inc/opengl/win/winlayout.hxx b/vcl/inc/opengl/win/winlayout.hxx
new file mode 100644
index 000000000..d017bc250
--- /dev/null
+++ b/vcl/inc/opengl/win/winlayout.hxx
@@ -0,0 +1,51 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * This file incorporates work covered by the following license notice:
+ *
+ *   Licensed to the Apache Software Foundation (ASF) under one or more
+ *   contributor license agreements. See the NOTICE file distributed
+ *   with this work for additional information regarding copyright
+ *   ownership. The ASF licenses this file to you under the Apache
+ *   License, Version 2.0 (the "License"); you may not use this file
+ *   except in compliance with the License. You may obtain a copy of
+ *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
+ */
+
+#ifndef INCLUDED_VCL_INC_OPENGL_WIN_WINLAYOUT_HXX
+#define INCLUDED_VCL_INC_OPENGL_WIN_WINLAYOUT_HXX
+
+#include <win/winlayout.hxx>
+#include <opengl/PackedTextureAtlas.hxx>
+
+struct OpenGLGlobalWinGlyphCache : public GlobalWinGlyphCache
+{
+    OpenGLGlobalWinGlyphCache()
+        : maPackedTextureAtlas(2048, 2048)
+    {
+    }
+
+    PackedTextureAtlasManager maPackedTextureAtlas;
+
+    virtual bool AllocateTexture(WinGlyphDrawElement& rElement, CompatibleDC* dc) override;
+    virtual void Prune() override;
+};
+
+class OpenGLWinGlyphCache : public WinGlyphCache
+{
+public:
+    void RemoveTextures(std::vector<GLuint>& rTextureIDs);
+
+private:
+    // This class just "adds" RemoveTextures() to the base class, it's never instantiated.
+    OpenGLWinGlyphCache() = delete;
+};
+
+#endif // INCLUDED_VCL_INC_OPENGL_WIN_WINLAYOUT_HXX
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/vcl/inc/opengl/x11/X11DeviceInfo.hxx b/vcl/inc/opengl/x11/X11DeviceInfo.hxx
new file mode 100644
index 000000000..d51de3a69
--- /dev/null
+++ b/vcl/inc/opengl/x11/X11DeviceInfo.hxx
@@ -0,0 +1,75 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+#ifndef INCLUDED_VCL_INC_OPENGL_X11_X11DEVICEINFO_HXX
+#define INCLUDED_VCL_INC_OPENGL_X11_X11DEVICEINFO_HXX
+
+#include <opengl/DeviceInfo.hxx>
+
+#include <rtl/string.hxx>
+
+class X11OpenGLDeviceInfo final : public OpenGLDeviceInfo
+{
+private:
+    bool mbIsMesa;
+    bool mbIsNVIDIA;
+    bool mbIsFGLRX;
+    bool mbIsNouveau;
+    bool mbIsIntel;
+    bool mbIsOldSwrast;
+    bool mbIsLlvmpipe;
+
+    OString maVendor;
+    OString maRenderer;
+    OString maVersion;
+    OString maOS;
+    OString maOSRelease;
+
+    size_t mnGLMajorVersion;
+    size_t mnMajorVersion;
+    size_t mnMinorVersion;
+    size_t mnRevisionVersion;
+
+    void GetData();
+
+public:
+    X11OpenGLDeviceInfo();
+
+    virtual bool isDeviceBlocked() override;
+
+    const OString& GetVendor() const
+    {
+        return maVendor;
+    }
+
+    const OString& GetRenderer() const
+    {
+        return maRenderer;
+    }
+
+    const OString& GetVersion() const
+    {
+        return maVersion;
+    }
+
+    const OString& GetOS() const
+    {
+        return maOS;
+    }
+
+    const OString& GetOSRelease() const
+    {
+        return maOSRelease;
+    }
+
+};
+
+#endif
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/vcl/inc/opengl/x11/cairotextrender.hxx b/vcl/inc/opengl/x11/cairotextrender.hxx
new file mode 100644
index 000000000..137022fa8
--- /dev/null
+++ b/vcl/inc/opengl/x11/cairotextrender.hxx
@@ -0,0 +1,27 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+#ifndef INCLUDED_VCL_UNX_GENERIC_GDI_OPENGLX11CAIROTEXTRENDER_HXX
+#define INCLUDED_VCL_UNX_GENERIC_GDI_OPENGLX11CAIROTEXTRENDER_HXX
+
+#include <unx/x11/x11cairotextrender.hxx>
+
+class OpenGLX11CairoTextRender final : public X11CairoTextRender
+{
+public:
+    explicit OpenGLX11CairoTextRender(X11SalGraphics& rParent);
+
+    virtual cairo_t* getCairoContext() override;
+    virtual void getSurfaceOffset(double& nDX, double& nDY) override;
+    virtual void releaseCairoContext(cairo_t* cr) override;
+};
+
+#endif
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/vcl/inc/opengl/x11/gdiimpl.hxx b/vcl/inc/opengl/x11/gdiimpl.hxx
new file mode 100644
index 000000000..d86af9223
--- /dev/null
+++ b/vcl/inc/opengl/x11/gdiimpl.hxx
@@ -0,0 +1,42 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+#ifndef INCLUDED_VCL_INC_OPENGL_X11_GDIIMPL_HXX
+#define INCLUDED_VCL_INC_OPENGL_X11_GDIIMPL_HXX
+
+#include <vcl/dllapi.h>
+
+#include <unx/salgdi.h>
+#include <unx/x11/x11gdiimpl.h>
+#include <opengl/gdiimpl.hxx>
+#include <ControlCacheKey.hxx>
+
+struct TextureCombo;
+
+class X11OpenGLSalGraphicsImpl : public OpenGLSalGraphicsImpl, public X11GraphicsImpl
+{
+private:
+    X11SalGraphics&     mrX11Parent;
+
+public:
+    X11OpenGLSalGraphicsImpl( X11SalGraphics& rParent );
+    virtual ~X11OpenGLSalGraphicsImpl() override;
+
+protected:
+    virtual rtl::Reference<OpenGLContext> CreateWinContext() override;
+
+public:
+    virtual void copyBits( const SalTwoRect& rPosAry, SalGraphics* pSrcGraphics ) override;
+
+    virtual void Init() override;
+};
+
+#endif // INCLUDED_VCL_INC_OPENGL_X11_GDIIMPL_HXX
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/vcl/inc/opengl/x11/glxtest.hxx b/vcl/inc/opengl/x11/glxtest.hxx
new file mode 100644
index 000000000..5715a6d9f
--- /dev/null
+++ b/vcl/inc/opengl/x11/glxtest.hxx
@@ -0,0 +1,21 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+#ifndef INCLUDED_VCL_INC_OPENGL_X11_GLXTEST_HXX
+#define INCLUDED_VCL_INC_OPENGL_X11_GLXTEST_HXX
+
+#include <vcl/dllapi.h>
+
+VCL_DLLPUBLIC int* getGlxPipe();
+
+VCL_DLLPUBLIC pid_t* getGlxPid();
+
+#endif
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/vcl/inc/opengl/x11/salvd.hxx b/vcl/inc/opengl/x11/salvd.hxx
new file mode 100644
index 000000000..a77b9874e
--- /dev/null
+++ b/vcl/inc/opengl/x11/salvd.hxx
@@ -0,0 +1,57 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+#ifndef INCLUDED_VCL_INC_OPENGL_X11_SALVD_H
+#define INCLUDED_VCL_INC_OPENGL_X11_SALVD_H
+
+#include <memory>
+#include <X11/Xlib.h>
+#include <X11/Xutil.h>
+
+#include <unx/saltype.h>
+#include <salvd.hxx>
+
+class SalDisplay;
+class X11OpenGLSalGraphics;
+class X11SalGraphics;
+
+class X11OpenGLSalVirtualDevice : public SalVirtualDevice
+{
+    SalDisplay       *mpDisplay;
+    std::unique_ptr<X11SalGraphics>
+                      mpGraphics;
+    bool              mbGraphics;         // is Graphics used
+    SalX11Screen      mnXScreen;
+    int               mnWidth;
+    int               mnHeight;
+
+public:
+    X11OpenGLSalVirtualDevice( SalGraphics const *pGraphics,
+                               long nDX, long nDY,
+                               const SystemGraphicsData *pData,
+                               std::unique_ptr<X11SalGraphics> pNewGraphics);
+    virtual ~X11OpenGLSalVirtualDevice() override;
+
+    // SalGeometryProvider
+    virtual long GetWidth() const override { return mnWidth; }
+    virtual long GetHeight() const override { return mnHeight; }
+
+    SalDisplay *            GetDisplay() const { return mpDisplay; }
+    const SalX11Screen&     GetXScreenNumber() const { return mnXScreen; }
+
+    virtual SalGraphics*    AcquireGraphics() override;
+    virtual void            ReleaseGraphics( SalGraphics* pGraphics ) override;
+
+                            // Set new size, without saving the old contents
+    virtual bool            SetSize( long nNewDX, long nNewDY ) override;
+};
+
+#endif // INCLUDED_VCL_INC_OPENGL_X11_SALVD_H
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/vcl/inc/opengl/zone.hxx b/vcl/inc/opengl/zone.hxx
new file mode 100644
index 000000000..4bcdf15dc
--- /dev/null
+++ b/vcl/inc/opengl/zone.hxx
@@ -0,0 +1,46 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+#ifndef INCLUDED_VCL_INC_OPENGL_ZONE_H
+#define INCLUDED_VCL_INC_OPENGL_ZONE_H
+
+#include <sal/config.h>
+#include <sal/types.h>
+#include <vcl/dllapi.h>
+#include <comphelper/crashzone.hxx>
+
+/**
+ * We want to be able to detect if a given crash came
+ * from the OpenGL code, so use this helper to track that.
+ */
+class VCL_DLLPUBLIC OpenGLZone : public CrashZone< OpenGLZone > {
+public:
+    static void hardDisable();
+    static void relaxWatchdogTimings();
+    static const CrashWatchdogTimingsValues& getCrashWatchdogTimingsValues();
+    static void checkDebug( int nUnchanged, const CrashWatchdogTimingsValues& aTimingValues );
+    static const char* name() { return "OpenGL"; }
+};
+
+/// Create this to not only enter the zone, but set VCL context.
+class OpenGLVCLContextZone {
+    OpenGLZone aZone;
+public:
+    OpenGLVCLContextZone();
+};
+
+class VCL_DLLPUBLIC PreDefaultWinNoOpenGLZone {
+public:
+    PreDefaultWinNoOpenGLZone();
+    ~PreDefaultWinNoOpenGLZone();
+};
+
+#endif // INCLUDED_VCL_INC_OPENGL_ZONE_H
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */