1 files changed, 178 insertions, 0 deletions
diff --git a/xbmc/rendering/gles/GLESShader.cpp b/xbmc/rendering/gles/GLESShader.cpp
new file mode 100644
index 0000000..3964f4b
--- /dev/null
+++ b/xbmc/rendering/gles/GLESShader.cpp
@@ -0,0 +1,178 @@
+/*
+ *  Copyright (C) 2005-2018 Team Kodi
+ *  This file is part of Kodi - https://kodi.tv
+ *
+ *  SPDX-License-Identifier: GPL-2.0-or-later
+ *  See LICENSES/README.md for more information.
+ */
+
+#include "GLESShader.h"
+
+#include "ServiceBroker.h"
+#include "rendering/MatrixGL.h"
+#include "rendering/RenderSystem.h"
+#include "utils/log.h"
+#include "windowing/GraphicContext.h"
+
+using namespace Shaders;
+
+CGLESShader::CGLESShader(const char* shader, const std::string& prefix)
+{
+  m_proj = nullptr;
+  m_model = nullptr;
+  m_clipPossible = false;
+
+  VertexShader()->LoadSource("gles_shader.vert");
+  PixelShader()->LoadSource(shader, prefix);
+}
+
+CGLESShader::CGLESShader(const char* vshader, const char* fshader, const std::string& prefix)
+{
+  m_proj = nullptr;
+  m_model  = nullptr;
+  m_clipPossible = false;
+
+  VertexShader()->LoadSource(vshader, prefix);
+  PixelShader()->LoadSource(fshader, prefix);
+}
+
+void CGLESShader::OnCompiledAndLinked()
+{
+  // This is called after CompileAndLink()
+
+  // Variables passed directly to the Fragment shader
+  m_hTex0   = glGetUniformLocation(ProgramHandle(), "m_samp0");
+  m_hTex1   = glGetUniformLocation(ProgramHandle(), "m_samp1");
+  m_hUniCol = glGetUniformLocation(ProgramHandle(), "m_unicol");
+  m_hField  = glGetUniformLocation(ProgramHandle(), "m_field");
+  m_hStep   = glGetUniformLocation(ProgramHandle(), "m_step");
+  m_hContrast   = glGetUniformLocation(ProgramHandle(), "m_contrast");
+  m_hBrightness = glGetUniformLocation(ProgramHandle(), "m_brightness");
+
+  // Variables passed directly to the Vertex shader
+  m_hProj  = glGetUniformLocation(ProgramHandle(), "m_proj");
+  m_hModel = glGetUniformLocation(ProgramHandle(), "m_model");
+  m_hCoord0Matrix = glGetUniformLocation(ProgramHandle(), "m_coord0Matrix");
+
+  // Vertex attributes
+  m_hPos    = glGetAttribLocation(ProgramHandle(),  "m_attrpos");
+  m_hCol    = glGetAttribLocation(ProgramHandle(),  "m_attrcol");
+  m_hCord0  = glGetAttribLocation(ProgramHandle(),  "m_attrcord0");
+  m_hCord1  = glGetAttribLocation(ProgramHandle(),  "m_attrcord1");
+
+  // It's okay to do this only one time. Textures units never change.
+  glUseProgram( ProgramHandle() );
+  glUniform1i(m_hTex0, 0);
+  glUniform1i(m_hTex1, 1);
+  glUniform4f(m_hUniCol, 1.0, 1.0, 1.0, 1.0);
+
+  const float identity[16] = {
+    1.0f, 0.0f, 0.0f, 0.0f,
+    0.0f, 1.0f, 0.0f, 0.0f,
+    0.0f, 0.0f, 1.0f, 0.0f,
+    0.0f, 0.0f, 0.0f, 1.0f
+  };
+  glUniformMatrix4fv(m_hCoord0Matrix,  1, GL_FALSE, identity);
+
+  glUseProgram( 0 );
+}
+
+bool CGLESShader::OnEnabled()
+{
+  // This is called after glUseProgram()
+
+  const GLfloat *projMatrix = glMatrixProject.Get();
+  const GLfloat *modelMatrix = glMatrixModview.Get();
+  glUniformMatrix4fv(m_hProj,  1, GL_FALSE, projMatrix);
+  glUniformMatrix4fv(m_hModel, 1, GL_FALSE, modelMatrix);
+
+  const TransformMatrix &guiMatrix = CServiceBroker::GetWinSystem()->GetGfxContext().GetGUIMatrix();
+  CRect viewPort; // absolute positions of corners
+  CServiceBroker::GetRenderSystem()->GetViewPort(viewPort);
+
+  /* glScissor operates in window coordinates. In order that we can use it to
+   * perform clipping, we must ensure that there is an independent linear
+   * transformation from the coordinate system used by CGraphicContext::ClipRect
+   * to window coordinates, separately for X and Y (in other words, no
+   * rotation or shear is introduced at any stage). To do, this, we need to
+   * check that zeros are present in the following locations:
+   *
+   * GUI matrix:
+   * / * 0 * * \
+   * | 0 * * * |
+   * \ 0 0 * * /
+   *       ^ TransformMatrix::TransformX/Y/ZCoord are only ever called with
+   *         input z = 0, so this column doesn't matter
+   * Model-view matrix:
+   * / * 0 0 * \
+   * | 0 * 0 * |
+   * | 0 0 * * |
+   * \ * * * * /  <- eye w has no influence on window x/y (last column below
+   *                                                       is either 0 or ignored)
+   * Projection matrix:
+   * / * 0 0 0 \
+   * | 0 * 0 0 |
+   * | * * * * |  <- normalised device coordinate z has no influence on window x/y
+   * \ 0 0 * 0 /
+   *
+   * Some of these zeros are not strictly required to ensure this, but they tend
+   * to be zeroed in the common case, so by checking for zeros here, we simplify
+   * the calculation of the window x/y coordinates further down the line.
+   *
+   * (Minor detail: we don't quite deal in window coordinates as defined by
+   * OpenGL, because CRenderSystemGLES::SetScissors flips the Y axis. But all
+   * that's needed to handle that is an effective negation at the stage where
+   * Y is in normalised device coordinates.)
+   */
+  m_clipPossible = guiMatrix.m[0][1] == 0 &&
+      guiMatrix.m[1][0] == 0 &&
+      guiMatrix.m[2][0] == 0 &&
+      guiMatrix.m[2][1] == 0 &&
+      modelMatrix[0+1*4] == 0 &&
+      modelMatrix[0+2*4] == 0 &&
+      modelMatrix[1+0*4] == 0 &&
+      modelMatrix[1+2*4] == 0 &&
+      modelMatrix[2+0*4] == 0 &&
+      modelMatrix[2+1*4] == 0 &&
+      projMatrix[0+1*4] == 0 &&
+      projMatrix[0+2*4] == 0 &&
+      projMatrix[0+3*4] == 0 &&
+      projMatrix[1+0*4] == 0 &&
+      projMatrix[1+2*4] == 0 &&
+      projMatrix[1+3*4] == 0 &&
+      projMatrix[3+0*4] == 0 &&
+      projMatrix[3+1*4] == 0 &&
+      projMatrix[3+3*4] == 0;
+
+  m_clipXFactor = 0.0;
+  m_clipXOffset = 0.0;
+  m_clipYFactor = 0.0;
+  m_clipYOffset = 0.0;
+
+  if (m_clipPossible)
+  {
+    m_clipXFactor = guiMatrix.m[0][0] * modelMatrix[0+0*4] * projMatrix[0+0*4];
+    m_clipXOffset = (guiMatrix.m[0][3] * modelMatrix[0+0*4] + modelMatrix[0+3*4]) * projMatrix[0+0*4];
+    m_clipYFactor = guiMatrix.m[1][1] * modelMatrix[1+1*4] * projMatrix[1+1*4];
+    m_clipYOffset = (guiMatrix.m[1][3] * modelMatrix[1+1*4] + modelMatrix[1+3*4]) * projMatrix[1+1*4];
+    float clipW = (guiMatrix.m[2][3] * modelMatrix[2+2*4] + modelMatrix[2+3*4]) * projMatrix[3+2*4];
+    float xMult = (viewPort.x2 - viewPort.x1) / (2 * clipW);
+    float yMult = (viewPort.y1 - viewPort.y2) / (2 * clipW); // correct for inverted window coordinate scheme
+    m_clipXFactor = m_clipXFactor * xMult;
+    m_clipXOffset = m_clipXOffset * xMult + (viewPort.x2 + viewPort.x1) / 2;
+    m_clipYFactor = m_clipYFactor * yMult;
+    m_clipYOffset = m_clipYOffset * yMult + (viewPort.y2 + viewPort.y1) / 2;
+  }
+
+  glUniform1f(m_hBrightness, 0.0f);
+  glUniform1f(m_hContrast, 1.0f);
+
+  return true;
+}
+
+void CGLESShader::Free()
+{
+  // Do Cleanup here
+  CGLSLShaderProgram::Free();
+}
+