Revert "Delete CC."

cc/output/shader.cc

+// Copyright 2011 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "cc/output/shader.h"
+
+#include <algorithm>
+
+#include "base/basictypes.h"
+#include "base/logging.h"
+#include "cc/output/gl_renderer.h"  // For the GLC() macro.
+#include "gpu/command_buffer/client/gles2_interface.h"
+
+template <size_t size>
+std::string StripLambda(const char(&shader)[size]) {
+  // Must contain at least "[]() {}" and trailing null (included in size).
+  static_assert(size >= 8,
+                "String passed to StripLambda must be at least 8 characters");
+  DCHECK_EQ(strncmp("[]() {", shader, 6), 0);
+  DCHECK_EQ(shader[size - 2], '}');
+  return std::string(shader + 6, shader + size - 2);
+}
+
+// Shaders are passed in with lambda syntax, which tricks clang-format into
+// handling them correctly. StipLambda removes this.
+#define SHADER0(Src) StripLambda(#Src)
+#define VERTEX_SHADER(Head, Body) SetVertexTexCoordPrecision(Head + Body)
+#define FRAGMENT_SHADER(Head, Body) \
+  SetFragmentTexCoordPrecision(     \
+      precision,                    \
+      SetFragmentSamplerType(sampler, SetBlendModeFunctions(Head + Body)))
+
+using gpu::gles2::GLES2Interface;
+
+namespace cc {
+
+namespace {
+
+static void GetProgramUniformLocations(GLES2Interface* context,
+                                       unsigned program,
+                                       size_t count,
+                                       const char** uniforms,
+                                       int* locations,
+                                       int* base_uniform_index) {
+  for (size_t i = 0; i < count; i++) {
+    locations[i] = (*base_uniform_index)++;
+    context->BindUniformLocationCHROMIUM(program, locations[i], uniforms[i]);
+  }
+}
+
+static std::string SetFragmentTexCoordPrecision(
+    TexCoordPrecision requested_precision,
+    std::string shader_string) {
+  switch (requested_precision) {
+    case TEX_COORD_PRECISION_HIGH:
+      DCHECK_NE(shader_string.find("TexCoordPrecision"), std::string::npos);
+      return "#ifdef GL_FRAGMENT_PRECISION_HIGH\n"
+             "  #define TexCoordPrecision highp\n"
+             "#else\n"
+             "  #define TexCoordPrecision mediump\n"
+             "#endif\n" +
+             shader_string;
+    case TEX_COORD_PRECISION_MEDIUM:
+      DCHECK_NE(shader_string.find("TexCoordPrecision"), std::string::npos);
+      return "#define TexCoordPrecision mediump\n" + shader_string;
+    case TEX_COORD_PRECISION_NA:
+      DCHECK_EQ(shader_string.find("TexCoordPrecision"), std::string::npos);
+      DCHECK_EQ(shader_string.find("texture2D"), std::string::npos);
+      DCHECK_EQ(shader_string.find("texture2DRect"), std::string::npos);
+      return shader_string;
+    default:
+      NOTREACHED();
+      break;
+  }
+  return shader_string;
+}
+
+static std::string SetVertexTexCoordPrecision(
+    const std::string& shader_string) {
+  // We unconditionally use highp in the vertex shader since
+  // we are unlikely to be vertex shader bound when drawing large quads.
+  // Also, some vertex shaders mutate the texture coordinate in such a
+  // way that the effective precision might be lower than expected.
+  return "#define TexCoordPrecision highp\n" + shader_string;
+}
+
+TexCoordPrecision TexCoordPrecisionRequired(GLES2Interface* context,
+                                            int* highp_threshold_cache,
+                                            int highp_threshold_min,
+                                            int x,
+                                            int y) {
+  if (*highp_threshold_cache == 0) {
+    // Initialize range and precision with minimum spec values for when
+    // GetShaderPrecisionFormat is a test stub.
+    // TODO(brianderson): Implement better stubs of GetShaderPrecisionFormat
+    // everywhere.
+    GLint range[2] = {14, 14};
+    GLint precision = 10;
+    GLC(context,
+        context->GetShaderPrecisionFormat(
+            GL_FRAGMENT_SHADER, GL_MEDIUM_FLOAT, range, &precision));
+    *highp_threshold_cache = 1 << precision;
+  }
+
+  int highp_threshold = std::max(*highp_threshold_cache, highp_threshold_min);
+  if (x > highp_threshold || y > highp_threshold)
+    return TEX_COORD_PRECISION_HIGH;
+  return TEX_COORD_PRECISION_MEDIUM;
+}
+
+static std::string SetFragmentSamplerType(SamplerType requested_type,
+                                          std::string shader_string) {
+  switch (requested_type) {
+    case SAMPLER_TYPE_2D:
+      DCHECK_NE(shader_string.find("SamplerType"), std::string::npos);
+      DCHECK_NE(shader_string.find("TextureLookup"), std::string::npos);
+      return "#define SamplerType sampler2D\n"
+             "#define TextureLookup texture2D\n" +
+             shader_string;
+    case SAMPLER_TYPE_2D_RECT:
+      DCHECK_NE(shader_string.find("SamplerType"), std::string::npos);
+      DCHECK_NE(shader_string.find("TextureLookup"), std::string::npos);
+      return "#extension GL_ARB_texture_rectangle : require\n"
+             "#define SamplerType sampler2DRect\n"
+             "#define TextureLookup texture2DRect\n" +
+             shader_string;
+    case SAMPLER_TYPE_EXTERNAL_OES:
+      DCHECK_NE(shader_string.find("SamplerType"), std::string::npos);
+      DCHECK_NE(shader_string.find("TextureLookup"), std::string::npos);
+      return "#extension GL_OES_EGL_image_external : require\n"
+             "#define SamplerType samplerExternalOES\n"
+             "#define TextureLookup texture2D\n" +
+             shader_string;
+    case SAMPLER_TYPE_NA:
+      DCHECK_EQ(shader_string.find("SamplerType"), std::string::npos);
+      DCHECK_EQ(shader_string.find("TextureLookup"), std::string::npos);
+      return shader_string;
+    default:
+      NOTREACHED();
+      break;
+  }
+  return shader_string;
+}
+
+}  // namespace
+
+ShaderLocations::ShaderLocations() {
+}
+
+TexCoordPrecision TexCoordPrecisionRequired(GLES2Interface* context,
+                                            int* highp_threshold_cache,
+                                            int highp_threshold_min,
+                                            const gfx::Point& max_coordinate) {
+  return TexCoordPrecisionRequired(context,
+                                   highp_threshold_cache,
+                                   highp_threshold_min,
+                                   max_coordinate.x(),
+                                   max_coordinate.y());
+}
+
+TexCoordPrecision TexCoordPrecisionRequired(GLES2Interface* context,
+                                            int* highp_threshold_cache,
+                                            int highp_threshold_min,
+                                            const gfx::Size& max_size) {
+  return TexCoordPrecisionRequired(context,
+                                   highp_threshold_cache,
+                                   highp_threshold_min,
+                                   max_size.width(),
+                                   max_size.height());
+}
+
+VertexShaderPosTex::VertexShaderPosTex() : matrix_location_(-1) {
+}
+
+void VertexShaderPosTex::Init(GLES2Interface* context,
+                              unsigned program,
+                              int* base_uniform_index) {
+  static const char* uniforms[] = {
+      "matrix",
+  };
+  int locations[arraysize(uniforms)];
+
+  GetProgramUniformLocations(context,
+                             program,
+                             arraysize(uniforms),
+                             uniforms,
+                             locations,
+                             base_uniform_index);
+  matrix_location_ = locations[0];
+}
+
+std::string VertexShaderPosTex::GetShaderString() const {
+  return VERTEX_SHADER(GetShaderHead(), GetShaderBody());
+}
+
+std::string VertexShaderPosTex::GetShaderHead() {
+  return SHADER0([]() {
+    attribute vec4 a_position;
+    attribute TexCoordPrecision vec2 a_texCoord;
+    uniform mat4 matrix;
+    varying TexCoordPrecision vec2 v_texCoord;
+  });
+}
+
+std::string VertexShaderPosTex::GetShaderBody() {
+  return SHADER0([]() {
+    void main() {
+      gl_Position = matrix * a_position;
+      v_texCoord = a_texCoord;
+    }
+  });
+}
+
+VertexShaderPosTexYUVStretchOffset::VertexShaderPosTexYUVStretchOffset()
+    : matrix_location_(-1), tex_scale_location_(-1), tex_offset_location_(-1) {
+}
+
+void VertexShaderPosTexYUVStretchOffset::Init(GLES2Interface* context,
+                                              unsigned program,
+                                              int* base_uniform_index) {
+  static const char* uniforms[] = {
+      "matrix", "texScale", "texOffset",
+  };
+  int locations[arraysize(uniforms)];
+
+  GetProgramUniformLocations(context,
+                             program,
+                             arraysize(uniforms),
+                             uniforms,
+                             locations,
+                             base_uniform_index);
+  matrix_location_ = locations[0];
+  tex_scale_location_ = locations[1];
+  tex_offset_location_ = locations[2];
+}
+
+std::string VertexShaderPosTexYUVStretchOffset::GetShaderString() const {
+  return VERTEX_SHADER(GetShaderHead(), GetShaderBody());
+}
+
+std::string VertexShaderPosTexYUVStretchOffset::GetShaderHead() {
+  return SHADER0([]() {
+    precision mediump float;
+    attribute vec4 a_position;
+    attribute TexCoordPrecision vec2 a_texCoord;
+    uniform mat4 matrix;
+    varying TexCoordPrecision vec2 v_texCoord;
+    uniform TexCoordPrecision vec2 texScale;
+    uniform TexCoordPrecision vec2 texOffset;
+  });
+}
+
+std::string VertexShaderPosTexYUVStretchOffset::GetShaderBody() {
+  return SHADER0([]() {
+    void main() {
+      gl_Position = matrix * a_position;
+      v_texCoord = a_texCoord * texScale + texOffset;
+    }
+  });
+}
+
+VertexShaderPos::VertexShaderPos() : matrix_location_(-1) {
+}
+
+void VertexShaderPos::Init(GLES2Interface* context,
+                           unsigned program,
+                           int* base_uniform_index) {
+  static const char* uniforms[] = {
+      "matrix",
+  };
+  int locations[arraysize(uniforms)];
+
+  GetProgramUniformLocations(context,
+                             program,
+                             arraysize(uniforms),
+                             uniforms,
+                             locations,
+                             base_uniform_index);
+  matrix_location_ = locations[0];
+}
+
+std::string VertexShaderPos::GetShaderString() const {
+  return VERTEX_SHADER(GetShaderHead(), GetShaderBody());
+}
+
+std::string VertexShaderPos::GetShaderHead() {
+  return SHADER0([]() {
+    attribute vec4 a_position;
+    uniform mat4 matrix;
+  });
+}
+
+std::string VertexShaderPos::GetShaderBody() {
+  return SHADER0([]() {
+    void main() { gl_Position = matrix * a_position; }
+  });
+}
+
+VertexShaderPosTexTransform::VertexShaderPosTexTransform()
+    : matrix_location_(-1),
+      tex_transform_location_(-1),
+      vertex_opacity_location_(-1) {
+}
+
+void VertexShaderPosTexTransform::Init(GLES2Interface* context,
+                                       unsigned program,
+                                       int* base_uniform_index) {
+  static const char* uniforms[] = {
+      "matrix", "texTransform", "opacity",
+  };
+  int locations[arraysize(uniforms)];
+
+  GetProgramUniformLocations(context,
+                             program,
+                             arraysize(uniforms),
+                             uniforms,
+                             locations,
+                             base_uniform_index);
+  matrix_location_ = locations[0];
+  tex_transform_location_ = locations[1];
+  vertex_opacity_location_ = locations[2];
+}
+
+std::string VertexShaderPosTexTransform::GetShaderString() const {
+  return VERTEX_SHADER(GetShaderHead(), GetShaderBody());
+}
+
+std::string VertexShaderPosTexTransform::GetShaderHead() {
+  return SHADER0([]() {
+    attribute vec4 a_position;
+    attribute TexCoordPrecision vec2 a_texCoord;
+    attribute float a_index;
+    uniform mat4 matrix[8];
+    uniform TexCoordPrecision vec4 texTransform[8];
+    uniform float opacity[32];
+    varying TexCoordPrecision vec2 v_texCoord;
+    varying float v_alpha;
+  });
+}
+
+std::string VertexShaderPosTexTransform::GetShaderBody() {
+  return SHADER0([]() {
+    void main() {
+      int quad_index = int(a_index * 0.25);  // NOLINT
+      gl_Position = matrix[quad_index] * a_position;
+      TexCoordPrecision vec4 texTrans = texTransform[quad_index];
+      v_texCoord = a_texCoord * texTrans.zw + texTrans.xy;
+      v_alpha = opacity[int(a_index)];  // NOLINT
+    }
+  });
+}
+
+void VertexShaderPosTexTransform::FillLocations(
+    ShaderLocations* locations) const {
+  locations->matrix = matrix_location();
+  locations->tex_transform = tex_transform_location();
+}
+
+std::string VertexShaderPosTexIdentity::GetShaderString() const {
+  return VERTEX_SHADER(GetShaderHead(), GetShaderBody());
+}
+
+std::string VertexShaderPosTexIdentity::GetShaderHead() {
+  return SHADER0([]() {
+    attribute vec4 a_position;
+    varying TexCoordPrecision vec2 v_texCoord;
+  });
+}
+
+std::string VertexShaderPosTexIdentity::GetShaderBody() {
+  return SHADER0([]() {
+    void main() {
+      gl_Position = a_position;
+      v_texCoord = (a_position.xy + vec2(1.0)) * 0.5;
+    }
+  });
+}
+
+VertexShaderQuad::VertexShaderQuad()
+    : matrix_location_(-1), quad_location_(-1) {
+}
+
+void VertexShaderQuad::Init(GLES2Interface* context,
+                            unsigned program,
+                            int* base_uniform_index) {
+  static const char* uniforms[] = {
+      "matrix", "quad",
+  };
+  int locations[arraysize(uniforms)];
+
+  GetProgramUniformLocations(context,
+                             program,
+                             arraysize(uniforms),
+                             uniforms,
+                             locations,
+                             base_uniform_index);
+  matrix_location_ = locations[0];
+  quad_location_ = locations[1];
+}
+
+std::string VertexShaderQuad::GetShaderString() const {
+  return VERTEX_SHADER(GetShaderHead(), GetShaderBody());
+}
+
+std::string VertexShaderQuad::GetShaderHead() {
+#if defined(OS_ANDROID)
+  // TODO(epenner): Find the cause of this 'quad' uniform
+  // being missing if we don't add dummy variables.
+  // http://crbug.com/240602
+  return SHADER0([]() {
+    attribute TexCoordPrecision vec4 a_position;
+    attribute float a_index;
+    uniform mat4 matrix;
+    uniform TexCoordPrecision vec2 quad[4];
+    uniform TexCoordPrecision vec2 dummy_uniform;
+    varying TexCoordPrecision vec2 dummy_varying;
+  });
+#else
+  return SHADER0([]() {
+    attribute TexCoordPrecision vec4 a_position;
+    attribute float a_index;
+    uniform mat4 matrix;
+    uniform TexCoordPrecision vec2 quad[4];
+  });
+#endif
+}
+
+std::string VertexShaderQuad::GetShaderBody() {
+#if defined(OS_ANDROID)
+  return SHADER0([]() {
+    void main() {
+      vec2 pos = quad[int(a_index)];  // NOLINT
+      gl_Position = matrix * vec4(pos, a_position.z, a_position.w);
+      dummy_varying = dummy_uniform;
+    }
+  });
+#else
+  return SHADER0([]() {
+    void main() {
+      vec2 pos = quad[int(a_index)];  // NOLINT
+      gl_Position = matrix * vec4(pos, a_position.z, a_position.w);
+    }
+  });
+#endif
+}
+
+VertexShaderQuadAA::VertexShaderQuadAA()
+    : matrix_location_(-1),
+      viewport_location_(-1),
+      quad_location_(-1),
+      edge_location_(-1) {
+}
+
+void VertexShaderQuadAA::Init(GLES2Interface* context,
+                              unsigned program,
+                              int* base_uniform_index) {
+  static const char* uniforms[] = {
+      "matrix", "viewport", "quad", "edge",
+  };
+  int locations[arraysize(uniforms)];
+
+  GetProgramUniformLocations(context,
+                             program,
+                             arraysize(uniforms),
+                             uniforms,
+                             locations,
+                             base_uniform_index);
+  matrix_location_ = locations[0];
+  viewport_location_ = locations[1];
+  quad_location_ = locations[2];
+  edge_location_ = locations[3];
+}
+
+std::string VertexShaderQuadAA::GetShaderString() const {
+  return VERTEX_SHADER(GetShaderHead(), GetShaderBody());
+}
+
+std::string VertexShaderQuadAA::GetShaderHead() {
+  return SHADER0([]() {
+    attribute TexCoordPrecision vec4 a_position;
+    attribute float a_index;
+    uniform mat4 matrix;
+    uniform vec4 viewport;
+    uniform TexCoordPrecision vec2 quad[4];
+    uniform TexCoordPrecision vec3 edge[8];
+    varying TexCoordPrecision vec4 edge_dist[2];  // 8 edge distances.
+  });
+}
+
+std::string VertexShaderQuadAA::GetShaderBody() {
+  return SHADER0([]() {
+    void main() {
+      vec2 pos = quad[int(a_index)];  // NOLINT
+      gl_Position = matrix * vec4(pos, a_position.z, a_position.w);
+      vec2 ndc_pos = 0.5 * (1.0 + gl_Position.xy / gl_Position.w);
+      vec3 screen_pos = vec3(viewport.xy + viewport.zw * ndc_pos, 1.0);
+      edge_dist[0] = vec4(dot(edge[0], screen_pos), dot(edge[1], screen_pos),
+                          dot(edge[2], screen_pos), dot(edge[3], screen_pos)) *
+                     gl_Position.w;
+      edge_dist[1] = vec4(dot(edge[4], screen_pos), dot(edge[5], screen_pos),
+                          dot(edge[6], screen_pos), dot(edge[7], screen_pos)) *
+                     gl_Position.w;
+    }
+  });
+}
+
+VertexShaderQuadTexTransformAA::VertexShaderQuadTexTransformAA()
+    : matrix_location_(-1),
+      viewport_location_(-1),
+      quad_location_(-1),
+      edge_location_(-1),
+      tex_transform_location_(-1) {
+}
+
+void VertexShaderQuadTexTransformAA::Init(GLES2Interface* context,
+                                          unsigned program,
+                                          int* base_uniform_index) {
+  static const char* uniforms[] = {
+      "matrix", "viewport", "quad", "edge", "texTrans",
+  };
+  int locations[arraysize(uniforms)];
+
+  GetProgramUniformLocations(context,
+                             program,
+                             arraysize(uniforms),
+                             uniforms,
+                             locations,
+                             base_uniform_index);
+  matrix_location_ = locations[0];
+  viewport_location_ = locations[1];
+  quad_location_ = locations[2];
+  edge_location_ = locations[3];
+  tex_transform_location_ = locations[4];
+}
+
+std::string VertexShaderQuadTexTransformAA::GetShaderString() const {
+  return VERTEX_SHADER(GetShaderHead(), GetShaderBody());
+}
+
+std::string VertexShaderQuadTexTransformAA::GetShaderHead() {
+  return SHADER0([]() {
+    attribute TexCoordPrecision vec4 a_position;
+    attribute float a_index;
+    uniform mat4 matrix;
+    uniform vec4 viewport;
+    uniform TexCoordPrecision vec2 quad[4];
+    uniform TexCoordPrecision vec3 edge[8];
+    uniform TexCoordPrecision vec4 texTrans;
+    varying TexCoordPrecision vec2 v_texCoord;
+    varying TexCoordPrecision vec4 edge_dist[2];  // 8 edge distances.
+  });
+}
+
+std::string VertexShaderQuadTexTransformAA::GetShaderBody() {
+  return SHADER0([]() {
+    void main() {
+      vec2 pos = quad[int(a_index)];  // NOLINT
+      gl_Position = matrix * vec4(pos, a_position.z, a_position.w);
+      vec2 ndc_pos = 0.5 * (1.0 + gl_Position.xy / gl_Position.w);
+      vec3 screen_pos = vec3(viewport.xy + viewport.zw * ndc_pos, 1.0);
+      edge_dist[0] = vec4(dot(edge[0], screen_pos), dot(edge[1], screen_pos),
+                          dot(edge[2], screen_pos), dot(edge[3], screen_pos)) *
+                     gl_Position.w;
+      edge_dist[1] = vec4(dot(edge[4], screen_pos), dot(edge[5], screen_pos),
+                          dot(edge[6], screen_pos), dot(edge[7], screen_pos)) *
+                     gl_Position.w;
+      v_texCoord = (pos.xy + vec2(0.5)) * texTrans.zw + texTrans.xy;
+    }
+  });
+}
+
+void VertexShaderQuadTexTransformAA::FillLocations(
+    ShaderLocations* locations) const {
+  locations->quad = quad_location();
+  locations->edge = edge_location();
+  locations->viewport = viewport_location();
+  locations->matrix = matrix_location();
+  locations->tex_transform = tex_transform_location();
+}
+
+
+VertexShaderTile::VertexShaderTile()
+    : matrix_location_(-1),
+      quad_location_(-1),
+      vertex_tex_transform_location_(-1) {
+}
+
+void VertexShaderTile::Init(GLES2Interface* context,
+                            unsigned program,
+                            int* base_uniform_index) {
+  static const char* uniforms[] = {
+      "matrix", "quad", "vertexTexTransform",
+  };
+  int locations[arraysize(uniforms)];
+
+  GetProgramUniformLocations(context,
+                             program,
+                             arraysize(uniforms),
+                             uniforms,
+                             locations,
+                             base_uniform_index);
+  matrix_location_ = locations[0];
+  quad_location_ = locations[1];
+  vertex_tex_transform_location_ = locations[2];
+}
+
+std::string VertexShaderTile::GetShaderString() const {
+  return VERTEX_SHADER(GetShaderHead(), GetShaderBody());
+}
+
+std::string VertexShaderTile::GetShaderHead() {
+  return SHADER0([]() {
+    attribute TexCoordPrecision vec4 a_position;
+    attribute TexCoordPrecision vec2 a_texCoord;
+    attribute float a_index;
+    uniform mat4 matrix;
+    uniform TexCoordPrecision vec2 quad[4];
+    uniform TexCoordPrecision vec4 vertexTexTransform;
+    varying TexCoordPrecision vec2 v_texCoord;
+  });
+}
+
+std::string VertexShaderTile::GetShaderBody() {
+  return SHADER0([]() {
+    void main() {
+      vec2 pos = quad[int(a_index)];  // NOLINT
+      gl_Position = matrix * vec4(pos, a_position.z, a_position.w);
+      v_texCoord = a_texCoord * vertexTexTransform.zw + vertexTexTransform.xy;
+    }
+  });
+}
+
+VertexShaderTileAA::VertexShaderTileAA()
+    : matrix_location_(-1),
+      viewport_location_(-1),
+      quad_location_(-1),
+      edge_location_(-1),
+      vertex_tex_transform_location_(-1) {
+}
+
+void VertexShaderTileAA::Init(GLES2Interface* context,
+                              unsigned program,
+                              int* base_uniform_index) {
+  static const char* uniforms[] = {
+      "matrix", "viewport", "quad", "edge", "vertexTexTransform",
+  };
+  int locations[arraysize(uniforms)];
+
+  GetProgramUniformLocations(context,
+                             program,
+                             arraysize(uniforms),
+                             uniforms,
+                             locations,
+                             base_uniform_index);
+  matrix_location_ = locations[0];
+  viewport_location_ = locations[1];
+  quad_location_ = locations[2];
+  edge_location_ = locations[3];
+  vertex_tex_transform_location_ = locations[4];
+}
+
+std::string VertexShaderTileAA::GetShaderString() const {
+  return VERTEX_SHADER(GetShaderHead(), GetShaderBody());
+}
+
+std::string VertexShaderTileAA::GetShaderHead() {
+  return SHADER0([]() {
+    attribute TexCoordPrecision vec4 a_position;
+    attribute float a_index;
+    uniform mat4 matrix;
+    uniform vec4 viewport;
+    uniform TexCoordPrecision vec2 quad[4];
+    uniform TexCoordPrecision vec3 edge[8];
+    uniform TexCoordPrecision vec4 vertexTexTransform;
+    varying TexCoordPrecision vec2 v_texCoord;
+    varying TexCoordPrecision vec4 edge_dist[2];  // 8 edge distances.
+  });
+}
+
+std::string VertexShaderTileAA::GetShaderBody() {
+  return SHADER0([]() {
+    void main() {
+      vec2 pos = quad[int(a_index)];  // NOLINT
+      gl_Position = matrix * vec4(pos, a_position.z, a_position.w);
+      vec2 ndc_pos = 0.5 * (1.0 + gl_Position.xy / gl_Position.w);
+      vec3 screen_pos = vec3(viewport.xy + viewport.zw * ndc_pos, 1.0);
+      edge_dist[0] = vec4(dot(edge[0], screen_pos), dot(edge[1], screen_pos),
+                          dot(edge[2], screen_pos), dot(edge[3], screen_pos)) *
+                     gl_Position.w;
+      edge_dist[1] = vec4(dot(edge[4], screen_pos), dot(edge[5], screen_pos),
+                          dot(edge[6], screen_pos), dot(edge[7], screen_pos)) *
+                     gl_Position.w;
+      v_texCoord = pos.xy * vertexTexTransform.zw + vertexTexTransform.xy;
+    }
+  });
+}
+
+VertexShaderVideoTransform::VertexShaderVideoTransform()
+    : matrix_location_(-1), tex_matrix_location_(-1) {
+}
+
+void VertexShaderVideoTransform::Init(GLES2Interface* context,
+                                      unsigned program,
+                                      int* base_uniform_index) {
+  static const char* uniforms[] = {
+      "matrix", "texMatrix",
+  };
+  int locations[arraysize(uniforms)];
+
+  GetProgramUniformLocations(context,
+                             program,
+                             arraysize(uniforms),
+                             uniforms,
+                             locations,
+                             base_uniform_index);
+  matrix_location_ = locations[0];
+  tex_matrix_location_ = locations[1];
+}
+
+std::string VertexShaderVideoTransform::GetShaderString() const {
+  return VERTEX_SHADER(GetShaderHead(), GetShaderBody());
+}
+
+std::string VertexShaderVideoTransform::GetShaderHead() {
+  return SHADER0([]() {
+    attribute vec4 a_position;
+    attribute TexCoordPrecision vec2 a_texCoord;
+    uniform mat4 matrix;
+    uniform TexCoordPrecision mat4 texMatrix;
+    varying TexCoordPrecision vec2 v_texCoord;
+  });
+}
+
+std::string VertexShaderVideoTransform::GetShaderBody() {
+  return SHADER0([]() {
+    void main() {
+      gl_Position = matrix * a_position;
+      v_texCoord =
+          vec2(texMatrix * vec4(a_texCoord.x, 1.0 - a_texCoord.y, 0.0, 1.0));
+    }
+  });
+}
+
+#define BLEND_MODE_UNIFORMS "s_backdropTexture", \
+                            "s_originalBackdropTexture", \
+                            "backdropRect"
+#define UNUSED_BLEND_MODE_UNIFORMS (!has_blend_mode() ? 3 : 0)
+#define BLEND_MODE_SET_LOCATIONS(X, POS)                   \
+  if (has_blend_mode()) {                                  \
+    DCHECK_LT(static_cast<size_t>(POS) + 2, arraysize(X)); \
+    backdrop_location_ = locations[POS];                   \
+    original_backdrop_location_ = locations[POS + 1];      \
+    backdrop_rect_location_ = locations[POS + 2];          \
+  }
+
+FragmentTexBlendMode::FragmentTexBlendMode()
+    : backdrop_location_(-1),
+      original_backdrop_location_(-1),
+      backdrop_rect_location_(-1),
+      blend_mode_(BLEND_MODE_NONE),
+      mask_for_background_(false) {
+}
+
+std::string FragmentTexBlendMode::SetBlendModeFunctions(
+    std::string shader_string) const {
+  if (shader_string.find("ApplyBlendMode") == std::string::npos)
+    return shader_string;
+
+  if (!has_blend_mode()) {
+    return "#define ApplyBlendMode(X, Y) (X)\n" + shader_string;
+  }
+
+  static const std::string kUniforms = SHADER0([]() {
+    uniform sampler2D s_backdropTexture;
+    uniform sampler2D s_originalBackdropTexture;
+    uniform TexCoordPrecision vec4 backdropRect;
+  });
+
+  std::string mixFunction;
+  if (mask_for_background()) {
+    mixFunction = SHADER0([]() {
+      vec4 MixBackdrop(TexCoordPrecision vec2 bgTexCoord, float mask) {
+        vec4 backdrop = texture2D(s_backdropTexture, bgTexCoord);
+        vec4 original_backdrop =
+            texture2D(s_originalBackdropTexture, bgTexCoord);
+        return mix(original_backdrop, backdrop, mask);
+      }
+    });
+  } else {
+    mixFunction = SHADER0([]() {
+      vec4 MixBackdrop(TexCoordPrecision vec2 bgTexCoord, float mask) {
+        return texture2D(s_backdropTexture, bgTexCoord);
+      }
+    });
+  }
+
+  static const std::string kFunctionApplyBlendMode = SHADER0([]() {
+    vec4 GetBackdropColor(float mask) {
+      TexCoordPrecision vec2 bgTexCoord = gl_FragCoord.xy - backdropRect.xy;
+      bgTexCoord.x /= backdropRect.z;
+      bgTexCoord.y /= backdropRect.w;
+      return MixBackdrop(bgTexCoord, mask);
+    }
+
+    vec4 ApplyBlendMode(vec4 src, float mask) {
+      vec4 dst = GetBackdropColor(mask);
+      return Blend(src, dst);
+    }
+  });
+
+  return "precision mediump float;" + GetHelperFunctions() +
+         GetBlendFunction() + kUniforms + mixFunction +
+         kFunctionApplyBlendMode + shader_string;
+}
+
+std::string FragmentTexBlendMode::GetHelperFunctions() const {
+  static const std::string kFunctionHardLight = SHADER0([]() {
+    vec3 hardLight(vec4 src, vec4 dst) {
+      vec3 result;
+      result.r =
+          (2.0 * src.r <= src.a)
+              ? (2.0 * src.r * dst.r)
+              : (src.a * dst.a - 2.0 * (dst.a - dst.r) * (src.a - src.r));
+      result.g =
+          (2.0 * src.g <= src.a)
+              ? (2.0 * src.g * dst.g)
+              : (src.a * dst.a - 2.0 * (dst.a - dst.g) * (src.a - src.g));
+      result.b =
+          (2.0 * src.b <= src.a)
+              ? (2.0 * src.b * dst.b)
+              : (src.a * dst.a - 2.0 * (dst.a - dst.b) * (src.a - src.b));
+      result.rgb += src.rgb * (1.0 - dst.a) + dst.rgb * (1.0 - src.a);
+      return result;
+    }
+  });
+
+  static const std::string kFunctionColorDodgeComponent = SHADER0([]() {
+    float getColorDodgeComponent(float srcc, float srca, float dstc,
+                                 float dsta) {
+      if (0.0 == dstc)
+        return srcc * (1.0 - dsta);
+      float d = srca - srcc;
+      if (0.0 == d)
+        return srca * dsta + srcc * (1.0 - dsta) + dstc * (1.0 - srca);
+      d = min(dsta, dstc * srca / d);
+      return d * srca + srcc * (1.0 - dsta) + dstc * (1.0 - srca);
+    }
+  });
+
+  static const std::string kFunctionColorBurnComponent = SHADER0([]() {
+    float getColorBurnComponent(float srcc, float srca, float dstc,
+                                float dsta) {
+      if (dsta == dstc)
+        return srca * dsta + srcc * (1.0 - dsta) + dstc * (1.0 - srca);
+      if (0.0 == srcc)
+        return dstc * (1.0 - srca);
+      float d = max(0.0, dsta - (dsta - dstc) * srca / srcc);
+      return srca * d + srcc * (1.0 - dsta) + dstc * (1.0 - srca);
+    }
+  });
+
+  static const std::string kFunctionSoftLightComponentPosDstAlpha =
+      SHADER0([]() {
+        float getSoftLightComponent(float srcc, float srca, float dstc,
+                                    float dsta) {
+          if (2.0 * srcc <= srca) {
+            return (dstc * dstc * (srca - 2.0 * srcc)) / dsta +
+                   (1.0 - dsta) * srcc + dstc * (-srca + 2.0 * srcc + 1.0);
+          } else if (4.0 * dstc <= dsta) {
+            float DSqd = dstc * dstc;
+            float DCub = DSqd * dstc;
+            float DaSqd = dsta * dsta;
+            float DaCub = DaSqd * dsta;
+            return (-DaCub * srcc +
+                    DaSqd * (srcc - dstc * (3.0 * srca - 6.0 * srcc - 1.0)) +
+                    12.0 * dsta * DSqd * (srca - 2.0 * srcc) -
+                    16.0 * DCub * (srca - 2.0 * srcc)) /
+                   DaSqd;
+          } else {
+            return -sqrt(dsta * dstc) * (srca - 2.0 * srcc) - dsta * srcc +
+                   dstc * (srca - 2.0 * srcc + 1.0) + srcc;
+          }
+        }
+      });
+
+  static const std::string kFunctionLum = SHADER0([]() {
+    float luminance(vec3 color) { return dot(vec3(0.3, 0.59, 0.11), color); }
+
+    vec3 set_luminance(vec3 hueSat, float alpha, vec3 lumColor) {
+      float diff = luminance(lumColor - hueSat);
+      vec3 outColor = hueSat + diff;
+      float outLum = luminance(outColor);
+      float minComp = min(min(outColor.r, outColor.g), outColor.b);
+      float maxComp = max(max(outColor.r, outColor.g), outColor.b);
+      if (minComp < 0.0 && outLum != minComp) {
+        outColor = outLum +
+                   ((outColor - vec3(outLum, outLum, outLum)) * outLum) /
+                       (outLum - minComp);
+      }
+      if (maxComp > alpha && maxComp != outLum) {
+        outColor =
+            outLum +
+            ((outColor - vec3(outLum, outLum, outLum)) * (alpha - outLum)) /
+                (maxComp - outLum);
+      }
+      return outColor;
+    }
+  });
+
+  static const std::string kFunctionSat = SHADER0([]() {
+    float saturation(vec3 color) {
+      return max(max(color.r, color.g), color.b) -
+             min(min(color.r, color.g), color.b);
+    }
+
+    vec3 set_saturation_helper(float minComp, float midComp, float maxComp,
+                               float sat) {
+      if (minComp < maxComp) {
+        vec3 result;
+        result.r = 0.0;
+        result.g = sat * (midComp - minComp) / (maxComp - minComp);
+        result.b = sat;
+        return result;
+      } else {
+        return vec3(0, 0, 0);
+      }
+    }
+
+    vec3 set_saturation(vec3 hueLumColor, vec3 satColor) {
+      float sat = saturation(satColor);
+      if (hueLumColor.r <= hueLumColor.g) {
+        if (hueLumColor.g <= hueLumColor.b) {
+          hueLumColor.rgb = set_saturation_helper(hueLumColor.r, hueLumColor.g,
+                                                  hueLumColor.b, sat);
+        } else if (hueLumColor.r <= hueLumColor.b) {
+          hueLumColor.rbg = set_saturation_helper(hueLumColor.r, hueLumColor.b,
+                                                  hueLumColor.g, sat);
+        } else {
+          hueLumColor.brg = set_saturation_helper(hueLumColor.b, hueLumColor.r,
+                                                  hueLumColor.g, sat);
+        }
+      } else if (hueLumColor.r <= hueLumColor.b) {
+        hueLumColor.grb = set_saturation_helper(hueLumColor.g, hueLumColor.r,
+                                                hueLumColor.b, sat);
+      } else if (hueLumColor.g <= hueLumColor.b) {
+        hueLumColor.gbr = set_saturation_helper(hueLumColor.g, hueLumColor.b,
+                                                hueLumColor.r, sat);
+      } else {
+        hueLumColor.bgr = set_saturation_helper(hueLumColor.b, hueLumColor.g,
+                                                hueLumColor.r, sat);
+      }
+      return hueLumColor;
+    }
+  });
+
+  switch (blend_mode_) {
+    case BLEND_MODE_OVERLAY:
+    case BLEND_MODE_HARD_LIGHT:
+      return kFunctionHardLight;
+    case BLEND_MODE_COLOR_DODGE:
+      return kFunctionColorDodgeComponent;
+    case BLEND_MODE_COLOR_BURN:
+      return kFunctionColorBurnComponent;
+    case BLEND_MODE_SOFT_LIGHT:
+      return kFunctionSoftLightComponentPosDstAlpha;
+    case BLEND_MODE_HUE:
+    case BLEND_MODE_SATURATION:
+      return kFunctionLum + kFunctionSat;
+    case BLEND_MODE_COLOR:
+    case BLEND_MODE_LUMINOSITY:
+      return kFunctionLum;
+    default:
+      return std::string();
+  }
+}
+
+std::string FragmentTexBlendMode::GetBlendFunction() const {
+  return "vec4 Blend(vec4 src, vec4 dst) {"
+         "    vec4 result;"
+         "    result.a = src.a + (1.0 - src.a) * dst.a;" +
+         GetBlendFunctionBodyForRGB() +
+         "    return result;"
+         "}";
+}
+
+std::string FragmentTexBlendMode::GetBlendFunctionBodyForRGB() const {
+  switch (blend_mode_) {
+    case BLEND_MODE_NORMAL:
+      return "result.rgb = src.rgb + dst.rgb * (1.0 - src.a);";
+    case BLEND_MODE_SCREEN:
+      return "result.rgb = src.rgb + (1.0 - src.rgb) * dst.rgb;";
+    case BLEND_MODE_LIGHTEN:
+      return "result.rgb = max((1.0 - src.a) * dst.rgb + src.rgb,"
+             "                 (1.0 - dst.a) * src.rgb + dst.rgb);";
+    case BLEND_MODE_OVERLAY:
+      return "result.rgb = hardLight(dst, src);";
+    case BLEND_MODE_DARKEN:
+      return "result.rgb = min((1.0 - src.a) * dst.rgb + src.rgb,"
+             "                 (1.0 - dst.a) * src.rgb + dst.rgb);";
+    case BLEND_MODE_COLOR_DODGE:
+      return "result.r = getColorDodgeComponent(src.r, src.a, dst.r, dst.a);"
+             "result.g = getColorDodgeComponent(src.g, src.a, dst.g, dst.a);"
+             "result.b = getColorDodgeComponent(src.b, src.a, dst.b, dst.a);";
+    case BLEND_MODE_COLOR_BURN:
+      return "result.r = getColorBurnComponent(src.r, src.a, dst.r, dst.a);"
+             "result.g = getColorBurnComponent(src.g, src.a, dst.g, dst.a);"
+             "result.b = getColorBurnComponent(src.b, src.a, dst.b, dst.a);";
+    case BLEND_MODE_HARD_LIGHT:
+      return "result.rgb = hardLight(src, dst);";
+    case BLEND_MODE_SOFT_LIGHT:
+      return "if (0.0 == dst.a) {"
+             "  result.rgb = src.rgb;"
+             "} else {"
+             "  result.r = getSoftLightComponent(src.r, src.a, dst.r, dst.a);"
+             "  result.g = getSoftLightComponent(src.g, src.a, dst.g, dst.a);"
+             "  result.b = getSoftLightComponent(src.b, src.a, dst.b, dst.a);"
+             "}";
+    case BLEND_MODE_DIFFERENCE:
+      return "result.rgb = src.rgb + dst.rgb -"
+             "    2.0 * min(src.rgb * dst.a, dst.rgb * src.a);";
+    case BLEND_MODE_EXCLUSION:
+      return "result.rgb = dst.rgb + src.rgb - 2.0 * dst.rgb * src.rgb;";
+    case BLEND_MODE_MULTIPLY:
+      return "result.rgb = (1.0 - src.a) * dst.rgb +"
+             "    (1.0 - dst.a) * src.rgb + src.rgb * dst.rgb;";
+    case BLEND_MODE_HUE:
+      return "vec4 dstSrcAlpha = dst * src.a;"
+             "result.rgb ="
+             "    set_luminance(set_saturation(src.rgb * dst.a,"
+             "                                 dstSrcAlpha.rgb),"
+             "                  dstSrcAlpha.a,"
+             "                  dstSrcAlpha.rgb);"
+             "result.rgb += (1.0 - src.a) * dst.rgb + (1.0 - dst.a) * src.rgb;";
+    case BLEND_MODE_SATURATION:
+      return "vec4 dstSrcAlpha = dst * src.a;"
+             "result.rgb = set_luminance(set_saturation(dstSrcAlpha.rgb,"
+             "                                          src.rgb * dst.a),"
+             "                           dstSrcAlpha.a,"
+             "                           dstSrcAlpha.rgb);"
+             "result.rgb += (1.0 - src.a) * dst.rgb + (1.0 - dst.a) * src.rgb;";
+    case BLEND_MODE_COLOR:
+      return "vec4 srcDstAlpha = src * dst.a;"
+             "result.rgb = set_luminance(srcDstAlpha.rgb,"
+             "                           srcDstAlpha.a,"
+             "                           dst.rgb * src.a);"
+             "result.rgb += (1.0 - src.a) * dst.rgb + (1.0 - dst.a) * src.rgb;";
+    case BLEND_MODE_LUMINOSITY:
+      return "vec4 srcDstAlpha = src * dst.a;"
+             "result.rgb = set_luminance(dst.rgb * src.a,"
+             "                           srcDstAlpha.a,"
+             "                           srcDstAlpha.rgb);"
+             "result.rgb += (1.0 - src.a) * dst.rgb + (1.0 - dst.a) * src.rgb;";
+    case BLEND_MODE_NONE:
+      NOTREACHED();
+  }
+  return "result = vec4(1.0, 0.0, 0.0, 1.0);";
+}
+
+FragmentTexAlphaBinding::FragmentTexAlphaBinding()
+    : sampler_location_(-1), alpha_location_(-1) {
+}
+
+void FragmentTexAlphaBinding::Init(GLES2Interface* context,
+                                   unsigned program,
+                                   int* base_uniform_index) {
+  static const char* uniforms[] = {
+      "s_texture", "alpha", BLEND_MODE_UNIFORMS,
+  };
+  int locations[arraysize(uniforms)];
+
+  GetProgramUniformLocations(context,
+                             program,
+                             arraysize(uniforms) - UNUSED_BLEND_MODE_UNIFORMS,
+                             uniforms,
+                             locations,
+                             base_uniform_index);
+  sampler_location_ = locations[0];
+  alpha_location_ = locations[1];
+  BLEND_MODE_SET_LOCATIONS(locations, 2);
+}
+
+FragmentTexColorMatrixAlphaBinding::FragmentTexColorMatrixAlphaBinding()
+    : sampler_location_(-1),
+      alpha_location_(-1),
+      color_matrix_location_(-1),
+      color_offset_location_(-1) {
+}
+
+void FragmentTexColorMatrixAlphaBinding::Init(GLES2Interface* context,
+                                              unsigned program,
+                                              int* base_uniform_index) {
+  static const char* uniforms[] = {
+      "s_texture", "alpha", "colorMatrix", "colorOffset", BLEND_MODE_UNIFORMS,
+  };
+  int locations[arraysize(uniforms)];
+
+  GetProgramUniformLocations(context,
+                             program,
+                             arraysize(uniforms) - UNUSED_BLEND_MODE_UNIFORMS,
+                             uniforms,
+                             locations,
+                             base_uniform_index);
+  sampler_location_ = locations[0];
+  alpha_location_ = locations[1];
+  color_matrix_location_ = locations[2];
+  color_offset_location_ = locations[3];
+  BLEND_MODE_SET_LOCATIONS(locations, 4);
+}
+
+FragmentTexOpaqueBinding::FragmentTexOpaqueBinding() : sampler_location_(-1) {
+}
+
+void FragmentTexOpaqueBinding::Init(GLES2Interface* context,
+                                    unsigned program,
+                                    int* base_uniform_index) {
+  static const char* uniforms[] = {
+      "s_texture",
+  };
+  int locations[arraysize(uniforms)];
+
+  GetProgramUniformLocations(context,
+                             program,
+                             arraysize(uniforms),
+                             uniforms,
+                             locations,
+                             base_uniform_index);
+  sampler_location_ = locations[0];
+}
+
+std::string FragmentShaderRGBATexAlpha::GetShaderString(
+    TexCoordPrecision precision,
+    SamplerType sampler) const {
+  return FRAGMENT_SHADER(GetShaderHead(), GetShaderBody());
+}
+
+std::string FragmentShaderRGBATexAlpha::GetShaderHead() {
+  return SHADER0([]() {
+    precision mediump float;
+    varying TexCoordPrecision vec2 v_texCoord;
+    uniform SamplerType s_texture;
+    uniform float alpha;
+  });
+}
+
+std::string FragmentShaderRGBATexAlpha::GetShaderBody() {
+  return SHADER0([]() {
+    void main() {
+      vec4 texColor = TextureLookup(s_texture, v_texCoord);
+      gl_FragColor = ApplyBlendMode(texColor * alpha, 0.0);
+    }
+  });
+}
+
+void FragmentShaderRGBATexAlpha::FillLocations(
+    ShaderLocations* locations) const {
+  locations->sampler = sampler_location();
+  locations->alpha = alpha_location();
+  locations->backdrop = backdrop_location();
+  locations->backdrop_rect = backdrop_rect_location();
+}
+
+std::string FragmentShaderRGBATexColorMatrixAlpha::GetShaderString(
+    TexCoordPrecision precision,
+    SamplerType sampler) const {
+  return FRAGMENT_SHADER(GetShaderHead(), GetShaderBody());
+}
+
+std::string FragmentShaderRGBATexColorMatrixAlpha::GetShaderHead() {
+  return SHADER0([]() {
+    precision mediump float;
+    varying TexCoordPrecision vec2 v_texCoord;
+    uniform SamplerType s_texture;
+    uniform float alpha;
+    uniform mat4 colorMatrix;
+    uniform vec4 colorOffset;
+  });
+}
+
+std::string FragmentShaderRGBATexColorMatrixAlpha::GetShaderBody() {
+  return SHADER0([]() {
+    void main() {
+      vec4 texColor = TextureLookup(s_texture, v_texCoord);
+      float nonZeroAlpha = max(texColor.a, 0.00001);
+      texColor = vec4(texColor.rgb / nonZeroAlpha, nonZeroAlpha);
+      texColor = colorMatrix * texColor + colorOffset;
+      texColor.rgb *= texColor.a;
+      texColor = clamp(texColor, 0.0, 1.0);
+      gl_FragColor = ApplyBlendMode(texColor * alpha, 0.0);
+    }
+  });
+}
+
+void FragmentShaderRGBATexColorMatrixAlpha::FillLocations(
+    ShaderLocations* locations) const {
+  locations->sampler = sampler_location();
+  locations->alpha = alpha_location();
+  locations->color_matrix = color_matrix_location();
+  locations->color_offset = color_offset_location();
+  locations->backdrop = backdrop_location();
+  locations->backdrop_rect = backdrop_rect_location();
+}
+
+std::string FragmentShaderRGBATexVaryingAlpha::GetShaderString(
+    TexCoordPrecision precision,
+    SamplerType sampler) const {
+  return FRAGMENT_SHADER(GetShaderHead(), GetShaderBody());
+}
+
+std::string FragmentShaderRGBATexVaryingAlpha::GetShaderHead() {
+  return SHADER0([]() {
+    precision mediump float;
+    varying TexCoordPrecision vec2 v_texCoord;
+    varying float v_alpha;
+    uniform SamplerType s_texture;
+  });
+}
+
+std::string FragmentShaderRGBATexVaryingAlpha::GetShaderBody() {
+  return SHADER0([]() {
+    void main() {
+      vec4 texColor = TextureLookup(s_texture, v_texCoord);
+      gl_FragColor = texColor * v_alpha;
+    }
+  });
+}
+
+std::string FragmentShaderRGBATexPremultiplyAlpha::GetShaderString(
+    TexCoordPrecision precision,
+    SamplerType sampler) const {
+  return FRAGMENT_SHADER(GetShaderHead(), GetShaderBody());
+}
+
+std::string FragmentShaderRGBATexPremultiplyAlpha::GetShaderHead() {
+  return SHADER0([]() {
+    precision mediump float;
+    varying TexCoordPrecision vec2 v_texCoord;
+    varying float v_alpha;
+    uniform SamplerType s_texture;
+  });
+}
+
+std::string FragmentShaderRGBATexPremultiplyAlpha::GetShaderBody() {
+  return SHADER0([]() {
+    void main() {
+      vec4 texColor = TextureLookup(s_texture, v_texCoord);
+      texColor.rgb *= texColor.a;
+      gl_FragColor = texColor * v_alpha;
+    }
+  });
+}
+
+FragmentTexBackgroundBinding::FragmentTexBackgroundBinding()
+    : background_color_location_(-1), sampler_location_(-1) {
+}
+
+void FragmentTexBackgroundBinding::Init(GLES2Interface* context,
+                                        unsigned program,
+                                        int* base_uniform_index) {
+  static const char* uniforms[] = {
+      "s_texture", "background_color",
+  };
+  int locations[arraysize(uniforms)];
+
+  GetProgramUniformLocations(context,
+                             program,
+                             arraysize(uniforms),
+                             uniforms,
+                             locations,
+                             base_uniform_index);
+
+  sampler_location_ = locations[0];
+  DCHECK_NE(sampler_location_, -1);
+
+  background_color_location_ = locations[1];
+  DCHECK_NE(background_color_location_, -1);
+}
+
+std::string FragmentShaderTexBackgroundVaryingAlpha::GetShaderString(
+    TexCoordPrecision precision,
+    SamplerType sampler) const {
+  return FRAGMENT_SHADER(GetShaderHead(), GetShaderBody());
+}
+
+std::string FragmentShaderTexBackgroundVaryingAlpha::GetShaderHead() {
+  return SHADER0([]() {
+    precision mediump float;
+    varying TexCoordPrecision vec2 v_texCoord;
+    varying float v_alpha;
+    uniform vec4 background_color;
+    uniform SamplerType s_texture;
+  });
+}
+
+std::string FragmentShaderTexBackgroundVaryingAlpha::GetShaderBody() {
+  return SHADER0([]() {
+    void main() {
+      vec4 texColor = TextureLookup(s_texture, v_texCoord);
+      texColor += background_color * (1.0 - texColor.a);
+      gl_FragColor = texColor * v_alpha;
+    }
+  });
+}
+
+std::string FragmentShaderTexBackgroundPremultiplyAlpha::GetShaderString(
+    TexCoordPrecision precision,
+    SamplerType sampler) const {
+  return FRAGMENT_SHADER(GetShaderHead(), GetShaderBody());
+}
+
+std::string FragmentShaderTexBackgroundPremultiplyAlpha::GetShaderHead() {
+  return SHADER0([]() {
+    precision mediump float;
+    varying TexCoordPrecision vec2 v_texCoord;
+    varying float v_alpha;
+    uniform vec4 background_color;
+    uniform SamplerType s_texture;
+  });
+}
+
+std::string FragmentShaderTexBackgroundPremultiplyAlpha::GetShaderBody() {
+  return SHADER0([]() {
+    void main() {
+      vec4 texColor = TextureLookup(s_texture, v_texCoord);
+      texColor.rgb *= texColor.a;
+      texColor += background_color * (1.0 - texColor.a);
+      gl_FragColor = texColor * v_alpha;
+    }
+  });
+}
+
+std::string FragmentShaderRGBATexOpaque::GetShaderString(
+    TexCoordPrecision precision,
+    SamplerType sampler) const {
+  return FRAGMENT_SHADER(GetShaderHead(), GetShaderBody());
+}
+
+std::string FragmentShaderRGBATexOpaque::GetShaderHead() {
+  return SHADER0([]() {
+    precision mediump float;
+    varying TexCoordPrecision vec2 v_texCoord;
+    uniform SamplerType s_texture;
+  });
+}
+
+std::string FragmentShaderRGBATexOpaque::GetShaderBody() {
+  return SHADER0([]() {
+    void main() {
+      vec4 texColor = TextureLookup(s_texture, v_texCoord);
+      gl_FragColor = vec4(texColor.rgb, 1.0);
+    }
+  });
+}
+
+std::string FragmentShaderRGBATex::GetShaderString(TexCoordPrecision precision,
+                                                   SamplerType sampler) const {
+  return FRAGMENT_SHADER(GetShaderHead(), GetShaderBody());
+}
+
+std::string FragmentShaderRGBATex::GetShaderHead() {
+  return SHADER0([]() {
+    precision mediump float;
+    varying TexCoordPrecision vec2 v_texCoord;
+    uniform SamplerType s_texture;
+  });
+}
+
+std::string FragmentShaderRGBATex::GetShaderBody() {
+  return SHADER0([]() {
+    void main() { gl_FragColor = TextureLookup(s_texture, v_texCoord); }
+  });
+}
+
+std::string FragmentShaderRGBATexSwizzleAlpha::GetShaderString(
+    TexCoordPrecision precision,
+    SamplerType sampler) const {
+  return FRAGMENT_SHADER(GetShaderHead(), GetShaderBody());
+}
+
+std::string FragmentShaderRGBATexSwizzleAlpha::GetShaderHead() {
+  return SHADER0([]() {
+    precision mediump float;
+    varying TexCoordPrecision vec2 v_texCoord;
+    uniform SamplerType s_texture;
+    uniform float alpha;
+  });
+}
+
+std::string FragmentShaderRGBATexSwizzleAlpha::GetShaderBody() {
+  return SHADER0([]() {
+    void main() {
+      vec4 texColor = TextureLookup(s_texture, v_texCoord);
+      gl_FragColor =
+          vec4(texColor.z, texColor.y, texColor.x, texColor.w) * alpha;
+    }
+  });
+}
+
+std::string FragmentShaderRGBATexSwizzleOpaque::GetShaderString(
+    TexCoordPrecision precision,
+    SamplerType sampler) const {
+  return FRAGMENT_SHADER(GetShaderHead(), GetShaderBody());
+}
+
+std::string FragmentShaderRGBATexSwizzleOpaque::GetShaderHead() {
+  return SHADER0([]() {
+    precision mediump float;
+    varying TexCoordPrecision vec2 v_texCoord;
+    uniform SamplerType s_texture;
+  });
+}
+
+std::string FragmentShaderRGBATexSwizzleOpaque::GetShaderBody() {
+  return SHADER0([]() {
+    void main() {
+      vec4 texColor = TextureLookup(s_texture, v_texCoord);
+      gl_FragColor = vec4(texColor.z, texColor.y, texColor.x, 1.0);
+    }
+  });
+}
+
+FragmentShaderRGBATexAlphaAA::FragmentShaderRGBATexAlphaAA()
+    : sampler_location_(-1), alpha_location_(-1) {
+}
+
+void FragmentShaderRGBATexAlphaAA::Init(GLES2Interface* context,
+                                        unsigned program,
+                                        int* base_uniform_index) {
+  static const char* uniforms[] = {
+      "s_texture", "alpha", BLEND_MODE_UNIFORMS,
+  };
+  int locations[arraysize(uniforms)];
+
+  GetProgramUniformLocations(context,
+                             program,
+                             arraysize(uniforms) - UNUSED_BLEND_MODE_UNIFORMS,
+                             uniforms,
+                             locations,
+                             base_uniform_index);
+  sampler_location_ = locations[0];
+  alpha_location_ = locations[1];
+  BLEND_MODE_SET_LOCATIONS(locations, 2);
+}
+
+std::string FragmentShaderRGBATexAlphaAA::GetShaderString(
+    TexCoordPrecision precision,
+    SamplerType sampler) const {
+  return FRAGMENT_SHADER(GetShaderHead(), GetShaderBody());
+}
+
+std::string FragmentShaderRGBATexAlphaAA::GetShaderHead() {
+  return SHADER0([]() {
+    precision mediump float;
+    uniform SamplerType s_texture;
+    uniform float alpha;
+    varying TexCoordPrecision vec2 v_texCoord;
+    varying TexCoordPrecision vec4 edge_dist[2];  // 8 edge distances.
+  });
+}
+
+std::string FragmentShaderRGBATexAlphaAA::GetShaderBody() {
+  return SHADER0([]() {
+    void main() {
+      vec4 texColor = TextureLookup(s_texture, v_texCoord);
+      vec4 d4 = min(edge_dist[0], edge_dist[1]);
+      vec2 d2 = min(d4.xz, d4.yw);
+      float aa = clamp(gl_FragCoord.w * min(d2.x, d2.y), 0.0, 1.0);
+      gl_FragColor = ApplyBlendMode(texColor * alpha * aa, 0.0);
+    }
+  });
+}
+
+void FragmentShaderRGBATexAlphaAA::FillLocations(
+    ShaderLocations* locations) const {
+  locations->sampler = sampler_location();
+  locations->alpha = alpha_location();
+  locations->backdrop = backdrop_location();
+  locations->backdrop_rect = backdrop_rect_location();
+}
+
+FragmentTexClampAlphaAABinding::FragmentTexClampAlphaAABinding()
+    : sampler_location_(-1),
+      alpha_location_(-1),
+      fragment_tex_transform_location_(-1) {
+}
+
+void FragmentTexClampAlphaAABinding::Init(GLES2Interface* context,
+                                          unsigned program,
+                                          int* base_uniform_index) {
+  static const char* uniforms[] = {
+      "s_texture", "alpha", "fragmentTexTransform",
+  };
+  int locations[arraysize(uniforms)];
+
+  GetProgramUniformLocations(context,
+                             program,
+                             arraysize(uniforms),
+                             uniforms,
+                             locations,
+                             base_uniform_index);
+  sampler_location_ = locations[0];
+  alpha_location_ = locations[1];
+  fragment_tex_transform_location_ = locations[2];
+}
+
+std::string FragmentShaderRGBATexClampAlphaAA::GetShaderString(
+    TexCoordPrecision precision,
+    SamplerType sampler) const {
+  return FRAGMENT_SHADER(GetShaderHead(), GetShaderBody());
+}
+
+std::string FragmentShaderRGBATexClampAlphaAA::GetShaderHead() {
+  return SHADER0([]() {
+    precision mediump float;
+    uniform SamplerType s_texture;
+    uniform float alpha;
+    uniform TexCoordPrecision vec4 fragmentTexTransform;
+    varying TexCoordPrecision vec2 v_texCoord;
+    varying TexCoordPrecision vec4 edge_dist[2];  // 8 edge distances.
+  });
+}
+
+std::string FragmentShaderRGBATexClampAlphaAA::GetShaderBody() {
+  return SHADER0([]() {
+    void main() {
+      TexCoordPrecision vec2 texCoord =
+          clamp(v_texCoord, 0.0, 1.0) * fragmentTexTransform.zw +
+          fragmentTexTransform.xy;
+      vec4 texColor = TextureLookup(s_texture, texCoord);
+      vec4 d4 = min(edge_dist[0], edge_dist[1]);
+      vec2 d2 = min(d4.xz, d4.yw);
+      float aa = clamp(gl_FragCoord.w * min(d2.x, d2.y), 0.0, 1.0);
+      gl_FragColor = texColor * alpha * aa;
+    }
+  });
+}
+
+std::string FragmentShaderRGBATexClampSwizzleAlphaAA::GetShaderString(
+    TexCoordPrecision precision,
+    SamplerType sampler) const {
+  return FRAGMENT_SHADER(GetShaderHead(), GetShaderBody());
+}
+
+std::string FragmentShaderRGBATexClampSwizzleAlphaAA::GetShaderHead() {
+  return SHADER0([]() {
+    precision mediump float;
+    uniform SamplerType s_texture;
+    uniform float alpha;
+    uniform TexCoordPrecision vec4 fragmentTexTransform;
+    varying TexCoordPrecision vec2 v_texCoord;
+    varying TexCoordPrecision vec4 edge_dist[2];  // 8 edge distances.
+  });
+}
+
+std::string FragmentShaderRGBATexClampSwizzleAlphaAA::GetShaderBody() {
+  return SHADER0([]() {
+    void main() {
+      TexCoordPrecision vec2 texCoord =
+          clamp(v_texCoord, 0.0, 1.0) * fragmentTexTransform.zw +
+          fragmentTexTransform.xy;
+      vec4 texColor = TextureLookup(s_texture, texCoord);
+      vec4 d4 = min(edge_dist[0], edge_dist[1]);
+      vec2 d2 = min(d4.xz, d4.yw);
+      float aa = clamp(gl_FragCoord.w * min(d2.x, d2.y), 0.0, 1.0);
+      gl_FragColor =
+          vec4(texColor.z, texColor.y, texColor.x, texColor.w) * alpha * aa;
+    }
+  });
+}
+
+FragmentShaderRGBATexAlphaMask::FragmentShaderRGBATexAlphaMask()
+    : sampler_location_(-1),
+      mask_sampler_location_(-1),
+      alpha_location_(-1),
+      mask_tex_coord_scale_location_(-1) {
+}
+
+void FragmentShaderRGBATexAlphaMask::Init(GLES2Interface* context,
+                                          unsigned program,
+                                          int* base_uniform_index) {
+  static const char* uniforms[] = {
+      "s_texture",
+      "s_mask",
+      "alpha",
+      "maskTexCoordScale",
+      "maskTexCoordOffset",
+      BLEND_MODE_UNIFORMS,
+  };
+  int locations[arraysize(uniforms)];
+
+  GetProgramUniformLocations(context,
+                             program,
+                             arraysize(uniforms) - UNUSED_BLEND_MODE_UNIFORMS,
+                             uniforms,
+                             locations,
+                             base_uniform_index);
+  sampler_location_ = locations[0];
+  mask_sampler_location_ = locations[1];
+  alpha_location_ = locations[2];
+  mask_tex_coord_scale_location_ = locations[3];
+  mask_tex_coord_offset_location_ = locations[4];
+  BLEND_MODE_SET_LOCATIONS(locations, 5);
+}
+
+std::string FragmentShaderRGBATexAlphaMask::GetShaderString(
+    TexCoordPrecision precision,
+    SamplerType sampler) const {
+  return FRAGMENT_SHADER(GetShaderHead(), GetShaderBody());
+}
+
+std::string FragmentShaderRGBATexAlphaMask::GetShaderHead() {
+  return SHADER0([]() {
+    precision mediump float;
+    varying TexCoordPrecision vec2 v_texCoord;
+    uniform sampler2D s_texture;
+    uniform SamplerType s_mask;
+    uniform TexCoordPrecision vec2 maskTexCoordScale;
+    uniform TexCoordPrecision vec2 maskTexCoordOffset;
+    uniform float alpha;
+  });
+}
+
+std::string FragmentShaderRGBATexAlphaMask::GetShaderBody() {
+  return SHADER0([]() {
+    void main() {
+      vec4 texColor = texture2D(s_texture, v_texCoord);
+      TexCoordPrecision vec2 maskTexCoord =
+          vec2(maskTexCoordOffset.x + v_texCoord.x * maskTexCoordScale.x,
+               maskTexCoordOffset.y + v_texCoord.y * maskTexCoordScale.y);
+      vec4 maskColor = TextureLookup(s_mask, maskTexCoord);
+      gl_FragColor = ApplyBlendMode(
+          texColor * alpha * maskColor.w, maskColor.w);
+    }
+  });
+}
+
+void FragmentShaderRGBATexAlphaMask::FillLocations(
+    ShaderLocations* locations) const {
+  locations->sampler = sampler_location();
+  locations->mask_sampler = mask_sampler_location();
+  locations->mask_tex_coord_scale = mask_tex_coord_scale_location();
+  locations->mask_tex_coord_offset = mask_tex_coord_offset_location();
+  locations->alpha = alpha_location();
+  locations->backdrop = backdrop_location();
+  locations->backdrop_rect = backdrop_rect_location();
+  if (mask_for_background())
+    locations->original_backdrop = original_backdrop_location();
+}
+
+FragmentShaderRGBATexAlphaMaskAA::FragmentShaderRGBATexAlphaMaskAA()
+    : sampler_location_(-1),
+      mask_sampler_location_(-1),
+      alpha_location_(-1),
+      mask_tex_coord_scale_location_(-1),
+      mask_tex_coord_offset_location_(-1) {
+}
+
+void FragmentShaderRGBATexAlphaMaskAA::Init(GLES2Interface* context,
+                                            unsigned program,
+                                            int* base_uniform_index) {
+  static const char* uniforms[] = {
+      "s_texture",
+      "s_mask",
+      "alpha",
+      "maskTexCoordScale",
+      "maskTexCoordOffset",
+      BLEND_MODE_UNIFORMS,
+  };
+  int locations[arraysize(uniforms)];
+
+  GetProgramUniformLocations(context,
+                             program,
+                             arraysize(uniforms) - UNUSED_BLEND_MODE_UNIFORMS,
+                             uniforms,
+                             locations,
+                             base_uniform_index);
+  sampler_location_ = locations[0];
+  mask_sampler_location_ = locations[1];
+  alpha_location_ = locations[2];
+  mask_tex_coord_scale_location_ = locations[3];
+  mask_tex_coord_offset_location_ = locations[4];
+  BLEND_MODE_SET_LOCATIONS(locations, 5);
+}
+
+std::string FragmentShaderRGBATexAlphaMaskAA::GetShaderString(
+    TexCoordPrecision precision,
+    SamplerType sampler) const {
+  return FRAGMENT_SHADER(GetShaderHead(), GetShaderBody());
+}
+
+std::string FragmentShaderRGBATexAlphaMaskAA::GetShaderHead() {
+  return SHADER0([]() {
+    precision mediump float;
+    uniform sampler2D s_texture;
+    uniform SamplerType s_mask;
+    uniform TexCoordPrecision vec2 maskTexCoordScale;
+    uniform TexCoordPrecision vec2 maskTexCoordOffset;
+    uniform float alpha;
+    varying TexCoordPrecision vec2 v_texCoord;
+    varying TexCoordPrecision vec4 edge_dist[2];  // 8 edge distances.
+  });
+}
+
+std::string FragmentShaderRGBATexAlphaMaskAA::GetShaderBody() {
+  return SHADER0([]() {
+    void main() {
+      vec4 texColor = texture2D(s_texture, v_texCoord);
+      TexCoordPrecision vec2 maskTexCoord =
+          vec2(maskTexCoordOffset.x + v_texCoord.x * maskTexCoordScale.x,
+               maskTexCoordOffset.y + v_texCoord.y * maskTexCoordScale.y);
+      vec4 maskColor = TextureLookup(s_mask, maskTexCoord);
+      vec4 d4 = min(edge_dist[0], edge_dist[1]);
+      vec2 d2 = min(d4.xz, d4.yw);
+      float aa = clamp(gl_FragCoord.w * min(d2.x, d2.y), 0.0, 1.0);
+      gl_FragColor = ApplyBlendMode(
+          texColor * alpha * maskColor.w * aa, maskColor.w);
+    }
+  });
+}
+
+void FragmentShaderRGBATexAlphaMaskAA::FillLocations(
+    ShaderLocations* locations) const {
+  locations->sampler = sampler_location();
+  locations->mask_sampler = mask_sampler_location();
+  locations->mask_tex_coord_scale = mask_tex_coord_scale_location();
+  locations->mask_tex_coord_offset = mask_tex_coord_offset_location();
+  locations->alpha = alpha_location();
+  locations->backdrop = backdrop_location();
+  locations->backdrop_rect = backdrop_rect_location();
+  if (mask_for_background())
+    locations->original_backdrop = original_backdrop_location();
+}
+
+FragmentShaderRGBATexAlphaMaskColorMatrixAA::
+    FragmentShaderRGBATexAlphaMaskColorMatrixAA()
+    : sampler_location_(-1),
+      mask_sampler_location_(-1),
+      alpha_location_(-1),
+      mask_tex_coord_scale_location_(-1),
+      color_matrix_location_(-1),
+      color_offset_location_(-1) {
+}
+
+void FragmentShaderRGBATexAlphaMaskColorMatrixAA::Init(
+    GLES2Interface* context,
+    unsigned program,
+    int* base_uniform_index) {
+  static const char* uniforms[] = {
+      "s_texture",
+      "s_mask",
+      "alpha",
+      "maskTexCoordScale",
+      "maskTexCoordOffset",
+      "colorMatrix",
+      "colorOffset",
+      BLEND_MODE_UNIFORMS,
+  };
+  int locations[arraysize(uniforms)];
+
+  GetProgramUniformLocations(context,
+                             program,
+                             arraysize(uniforms) - UNUSED_BLEND_MODE_UNIFORMS,
+                             uniforms,
+                             locations,
+                             base_uniform_index);
+  sampler_location_ = locations[0];
+  mask_sampler_location_ = locations[1];
+  alpha_location_ = locations[2];
+  mask_tex_coord_scale_location_ = locations[3];
+  mask_tex_coord_offset_location_ = locations[4];
+  color_matrix_location_ = locations[5];
+  color_offset_location_ = locations[6];
+  BLEND_MODE_SET_LOCATIONS(locations, 7);
+}
+
+std::string FragmentShaderRGBATexAlphaMaskColorMatrixAA::GetShaderString(
+    TexCoordPrecision precision,
+    SamplerType sampler) const {
+  return FRAGMENT_SHADER(GetShaderHead(), GetShaderBody());
+}
+
+std::string FragmentShaderRGBATexAlphaMaskColorMatrixAA::GetShaderHead() {
+  return SHADER0([]() {
+    precision mediump float;
+    uniform sampler2D s_texture;
+    uniform SamplerType s_mask;
+    uniform vec2 maskTexCoordScale;
+    uniform vec2 maskTexCoordOffset;
+    uniform mat4 colorMatrix;
+    uniform vec4 colorOffset;
+    uniform float alpha;
+    varying TexCoordPrecision vec2 v_texCoord;
+    varying TexCoordPrecision vec4 edge_dist[2];  // 8 edge distances.
+  });
+}
+
+std::string FragmentShaderRGBATexAlphaMaskColorMatrixAA::GetShaderBody() {
+  return SHADER0([]() {
+    void main() {
+      vec4 texColor = texture2D(s_texture, v_texCoord);
+      float nonZeroAlpha = max(texColor.a, 0.00001);
+      texColor = vec4(texColor.rgb / nonZeroAlpha, nonZeroAlpha);
+      texColor = colorMatrix * texColor + colorOffset;
+      texColor.rgb *= texColor.a;
+      texColor = clamp(texColor, 0.0, 1.0);
+      TexCoordPrecision vec2 maskTexCoord =
+          vec2(maskTexCoordOffset.x + v_texCoord.x * maskTexCoordScale.x,
+               maskTexCoordOffset.y + v_texCoord.y * maskTexCoordScale.y);
+      vec4 maskColor = TextureLookup(s_mask, maskTexCoord);
+      vec4 d4 = min(edge_dist[0], edge_dist[1]);
+      vec2 d2 = min(d4.xz, d4.yw);
+      float aa = clamp(gl_FragCoord.w * min(d2.x, d2.y), 0.0, 1.0);
+      gl_FragColor = ApplyBlendMode(
+          texColor * alpha * maskColor.w * aa, maskColor.w);
+    }
+  });
+}
+
+void FragmentShaderRGBATexAlphaMaskColorMatrixAA::FillLocations(
+    ShaderLocations* locations) const {
+  locations->sampler = sampler_location();
+  locations->alpha = alpha_location();
+  locations->mask_sampler = mask_sampler_location();
+  locations->mask_tex_coord_scale = mask_tex_coord_scale_location();
+  locations->mask_tex_coord_offset = mask_tex_coord_offset_location();
+  locations->color_matrix = color_matrix_location();
+  locations->color_offset = color_offset_location();
+  locations->backdrop = backdrop_location();
+  locations->backdrop_rect = backdrop_rect_location();
+  if (mask_for_background())
+    locations->original_backdrop = original_backdrop_location();
+}
+
+FragmentShaderRGBATexAlphaColorMatrixAA::
+    FragmentShaderRGBATexAlphaColorMatrixAA()
+    : sampler_location_(-1),
+      alpha_location_(-1),
+      color_matrix_location_(-1),
+      color_offset_location_(-1) {
+}
+
+void FragmentShaderRGBATexAlphaColorMatrixAA::Init(GLES2Interface* context,
+                                                   unsigned program,
+                                                   int* base_uniform_index) {
+  static const char* uniforms[] = {
+      "s_texture", "alpha", "colorMatrix", "colorOffset", BLEND_MODE_UNIFORMS,
+  };
+  int locations[arraysize(uniforms)];
+
+  GetProgramUniformLocations(context,
+                             program,
+                             arraysize(uniforms) - UNUSED_BLEND_MODE_UNIFORMS,
+                             uniforms,
+                             locations,
+                             base_uniform_index);
+  sampler_location_ = locations[0];
+  alpha_location_ = locations[1];
+  color_matrix_location_ = locations[2];
+  color_offset_location_ = locations[3];
+  BLEND_MODE_SET_LOCATIONS(locations, 4);
+}
+
+std::string FragmentShaderRGBATexAlphaColorMatrixAA::GetShaderString(
+    TexCoordPrecision precision,
+    SamplerType sampler) const {
+  return FRAGMENT_SHADER(GetShaderHead(), GetShaderBody());
+}
+
+std::string FragmentShaderRGBATexAlphaColorMatrixAA::GetShaderHead() {
+  return SHADER0([]() {
+    precision mediump float;
+    uniform SamplerType s_texture;
+    uniform float alpha;
+    uniform mat4 colorMatrix;
+    uniform vec4 colorOffset;
+    varying TexCoordPrecision vec2 v_texCoord;
+    varying TexCoordPrecision vec4 edge_dist[2];  // 8 edge distances.
+  });
+}
+
+std::string FragmentShaderRGBATexAlphaColorMatrixAA::GetShaderBody() {
+  return SHADER0([]() {
+    void main() {
+      vec4 texColor = TextureLookup(s_texture, v_texCoord);
+      float nonZeroAlpha = max(texColor.a, 0.00001);
+      texColor = vec4(texColor.rgb / nonZeroAlpha, nonZeroAlpha);
+      texColor = colorMatrix * texColor + colorOffset;
+      texColor.rgb *= texColor.a;
+      texColor = clamp(texColor, 0.0, 1.0);
+      vec4 d4 = min(edge_dist[0], edge_dist[1]);
+      vec2 d2 = min(d4.xz, d4.yw);
+      float aa = clamp(gl_FragCoord.w * min(d2.x, d2.y), 0.0, 1.0);
+      gl_FragColor = ApplyBlendMode(texColor * alpha * aa, 0.0);
+    }
+  });
+}
+
+void FragmentShaderRGBATexAlphaColorMatrixAA::FillLocations(
+    ShaderLocations* locations) const {
+  locations->sampler = sampler_location();
+  locations->alpha = alpha_location();
+  locations->color_matrix = color_matrix_location();
+  locations->color_offset = color_offset_location();
+  locations->backdrop = backdrop_location();
+  locations->backdrop_rect = backdrop_rect_location();
+}
+
+FragmentShaderRGBATexAlphaMaskColorMatrix::
+    FragmentShaderRGBATexAlphaMaskColorMatrix()
+    : sampler_location_(-1),
+      mask_sampler_location_(-1),
+      alpha_location_(-1),
+      mask_tex_coord_scale_location_(-1) {
+}
+
+void FragmentShaderRGBATexAlphaMaskColorMatrix::Init(GLES2Interface* context,
+                                                     unsigned program,
+                                                     int* base_uniform_index) {
+  static const char* uniforms[] = {
+      "s_texture",
+      "s_mask",
+      "alpha",
+      "maskTexCoordScale",
+      "maskTexCoordOffset",
+      "colorMatrix",
+      "colorOffset",
+      BLEND_MODE_UNIFORMS,
+  };
+  int locations[arraysize(uniforms)];
+
+  GetProgramUniformLocations(context,
+                             program,
+                             arraysize(uniforms) - UNUSED_BLEND_MODE_UNIFORMS,
+                             uniforms,
+                             locations,
+                             base_uniform_index);
+  sampler_location_ = locations[0];
+  mask_sampler_location_ = locations[1];
+  alpha_location_ = locations[2];
+  mask_tex_coord_scale_location_ = locations[3];
+  mask_tex_coord_offset_location_ = locations[4];
+  color_matrix_location_ = locations[5];
+  color_offset_location_ = locations[6];
+  BLEND_MODE_SET_LOCATIONS(locations, 7);
+}
+
+std::string FragmentShaderRGBATexAlphaMaskColorMatrix::GetShaderString(
+    TexCoordPrecision precision,
+    SamplerType sampler) const {
+  return FRAGMENT_SHADER(GetShaderHead(), GetShaderBody());
+}
+
+std::string FragmentShaderRGBATexAlphaMaskColorMatrix::GetShaderHead() {
+  return SHADER0([]() {
+    precision mediump float;
+    varying TexCoordPrecision vec2 v_texCoord;
+    uniform sampler2D s_texture;
+    uniform SamplerType s_mask;
+    uniform vec2 maskTexCoordScale;
+    uniform vec2 maskTexCoordOffset;
+    uniform mat4 colorMatrix;
+    uniform vec4 colorOffset;
+    uniform float alpha;
+  });
+}
+
+std::string FragmentShaderRGBATexAlphaMaskColorMatrix::GetShaderBody() {
+  return SHADER0([]() {
+    void main() {
+      vec4 texColor = texture2D(s_texture, v_texCoord);
+      float nonZeroAlpha = max(texColor.a, 0.00001);
+      texColor = vec4(texColor.rgb / nonZeroAlpha, nonZeroAlpha);
+      texColor = colorMatrix * texColor + colorOffset;
+      texColor.rgb *= texColor.a;
+      texColor = clamp(texColor, 0.0, 1.0);
+      TexCoordPrecision vec2 maskTexCoord =
+          vec2(maskTexCoordOffset.x + v_texCoord.x * maskTexCoordScale.x,
+               maskTexCoordOffset.y + v_texCoord.y * maskTexCoordScale.y);
+      vec4 maskColor = TextureLookup(s_mask, maskTexCoord);
+      gl_FragColor = ApplyBlendMode(
+          texColor * alpha * maskColor.w, maskColor.w);
+    }
+  });
+}
+
+void FragmentShaderRGBATexAlphaMaskColorMatrix::FillLocations(
+    ShaderLocations* locations) const {
+  locations->sampler = sampler_location();
+  locations->mask_sampler = mask_sampler_location();
+  locations->mask_tex_coord_scale = mask_tex_coord_scale_location();
+  locations->mask_tex_coord_offset = mask_tex_coord_offset_location();
+  locations->alpha = alpha_location();
+  locations->color_matrix = color_matrix_location();
+  locations->color_offset = color_offset_location();
+  locations->backdrop = backdrop_location();
+  locations->backdrop_rect = backdrop_rect_location();
+  if (mask_for_background())
+    locations->original_backdrop = original_backdrop_location();
+}
+
+FragmentShaderYUVVideo::FragmentShaderYUVVideo()
+    : y_texture_location_(-1),
+      u_texture_location_(-1),
+      v_texture_location_(-1),
+      alpha_location_(-1),
+      yuv_matrix_location_(-1),
+      yuv_adj_location_(-1),
+      clamp_rect_location_(-1) {
+}
+
+void FragmentShaderYUVVideo::Init(GLES2Interface* context,
+                                  unsigned program,
+                                  int* base_uniform_index) {
+  static const char* uniforms[] = {"y_texture",
+                                   "u_texture",
+                                   "v_texture",
+                                   "alpha",
+                                   "yuv_matrix",
+                                   "yuv_adj",
+                                   "clamp_rect"};
+  int locations[arraysize(uniforms)];
+
+  GetProgramUniformLocations(context,
+                             program,
+                             arraysize(uniforms),
+                             uniforms,
+                             locations,
+                             base_uniform_index);
+  y_texture_location_ = locations[0];
+  u_texture_location_ = locations[1];
+  v_texture_location_ = locations[2];
+  alpha_location_ = locations[3];
+  yuv_matrix_location_ = locations[4];
+  yuv_adj_location_ = locations[5];
+  clamp_rect_location_ = locations[6];
+}
+
+std::string FragmentShaderYUVVideo::GetShaderString(TexCoordPrecision precision,
+                                                    SamplerType sampler) const {
+  return FRAGMENT_SHADER(GetShaderHead(), GetShaderBody());
+}
+
+std::string FragmentShaderYUVVideo::GetShaderHead() {
+  return SHADER0([]() {
+    precision mediump float;
+    precision mediump int;
+    varying TexCoordPrecision vec2 v_texCoord;
+    uniform SamplerType y_texture;
+    uniform SamplerType u_texture;
+    uniform SamplerType v_texture;
+    uniform float alpha;
+    uniform vec3 yuv_adj;
+    uniform mat3 yuv_matrix;
+    uniform vec4 clamp_rect;
+  });
+}
+
+std::string FragmentShaderYUVVideo::GetShaderBody() {
+  return SHADER0([]() {
+    void main() {
+      vec2 clamped = max(clamp_rect.xy, min(clamp_rect.zw, v_texCoord));
+      float y_raw = TextureLookup(y_texture, clamped).x;
+      float u_unsigned = TextureLookup(u_texture, clamped).x;
+      float v_unsigned = TextureLookup(v_texture, clamped).x;
+      vec3 yuv = vec3(y_raw, u_unsigned, v_unsigned) + yuv_adj;
+      vec3 rgb = yuv_matrix * yuv;
+      gl_FragColor = vec4(rgb, 1.0) * alpha;
+    }
+  });
+}
+
+FragmentShaderYUVAVideo::FragmentShaderYUVAVideo()
+    : y_texture_location_(-1),
+      u_texture_location_(-1),
+      v_texture_location_(-1),
+      a_texture_location_(-1),
+      alpha_location_(-1),
+      yuv_matrix_location_(-1),
+      yuv_adj_location_(-1) {
+}
+
+void FragmentShaderYUVAVideo::Init(GLES2Interface* context,
+                                   unsigned program,
+                                   int* base_uniform_index) {
+  static const char* uniforms[] = {
+      "y_texture",
+      "u_texture",
+      "v_texture",
+      "a_texture",
+      "alpha",
+      "cc_matrix",
+      "yuv_adj",
+      "clamp_rect",
+  };
+  int locations[arraysize(uniforms)];
+
+  GetProgramUniformLocations(context,
+                             program,
+                             arraysize(uniforms),
+                             uniforms,
+                             locations,
+                             base_uniform_index);
+  y_texture_location_ = locations[0];
+  u_texture_location_ = locations[1];
+  v_texture_location_ = locations[2];
+  a_texture_location_ = locations[3];
+  alpha_location_ = locations[4];
+  yuv_matrix_location_ = locations[5];
+  yuv_adj_location_ = locations[6];
+  clamp_rect_location_ = locations[7];
+}
+
+std::string FragmentShaderYUVAVideo::GetShaderString(
+    TexCoordPrecision precision,
+    SamplerType sampler) const {
+  return FRAGMENT_SHADER(GetShaderHead(), GetShaderBody());
+}
+
+std::string FragmentShaderYUVAVideo::GetShaderHead() {
+  return SHADER0([]() {
+    precision mediump float;
+    precision mediump int;
+    varying TexCoordPrecision vec2 v_texCoord;
+    uniform SamplerType y_texture;
+    uniform SamplerType u_texture;
+    uniform SamplerType v_texture;
+    uniform SamplerType a_texture;
+    uniform float alpha;
+    uniform vec3 yuv_adj;
+    uniform mat3 yuv_matrix;
+    uniform vec4 clamp_rect;
+  });
+}
+
+std::string FragmentShaderYUVAVideo::GetShaderBody() {
+  return SHADER0([]() {
+    void main() {
+      vec2 clamped = max(clamp_rect.xy, min(clamp_rect.zw, v_texCoord));
+      float y_raw = TextureLookup(y_texture, clamped).x;
+      float u_unsigned = TextureLookup(u_texture, clamped).x;
+      float v_unsigned = TextureLookup(v_texture, clamped).x;
+      float a_raw = TextureLookup(a_texture, clamped).x;
+      vec3 yuv = vec3(y_raw, u_unsigned, v_unsigned) + yuv_adj;
+      vec3 rgb = yuv_matrix * yuv;
+      gl_FragColor = vec4(rgb, 1.0) * (alpha * a_raw);
+    }
+  });
+}
+
+FragmentShaderColor::FragmentShaderColor() : color_location_(-1) {
+}
+
+void FragmentShaderColor::Init(GLES2Interface* context,
+                               unsigned program,
+                               int* base_uniform_index) {
+  static const char* uniforms[] = {
+      "color",
+  };
+  int locations[arraysize(uniforms)];
+
+  GetProgramUniformLocations(context,
+                             program,
+                             arraysize(uniforms),
+                             uniforms,
+                             locations,
+                             base_uniform_index);
+  color_location_ = locations[0];
+}
+
+std::string FragmentShaderColor::GetShaderString(TexCoordPrecision precision,
+                                                 SamplerType sampler) const {
+  return FRAGMENT_SHADER(GetShaderHead(), GetShaderBody());
+}
+
+std::string FragmentShaderColor::GetShaderHead() {
+  return SHADER0([]() {
+    precision mediump float;
+    uniform vec4 color;
+  });
+}
+
+std::string FragmentShaderColor::GetShaderBody() {
+  return SHADER0([]() {
+    void main() { gl_FragColor = color; }
+  });
+}
+
+FragmentShaderColorAA::FragmentShaderColorAA() : color_location_(-1) {
+}
+
+void FragmentShaderColorAA::Init(GLES2Interface* context,
+                                 unsigned program,
+                                 int* base_uniform_index) {
+  static const char* uniforms[] = {
+      "color",
+  };
+  int locations[arraysize(uniforms)];
+
+  GetProgramUniformLocations(context,
+                             program,
+                             arraysize(uniforms),
+                             uniforms,
+                             locations,
+                             base_uniform_index);
+  color_location_ = locations[0];
+}
+
+std::string FragmentShaderColorAA::GetShaderString(TexCoordPrecision precision,
+                                                   SamplerType sampler) const {
+  return FRAGMENT_SHADER(GetShaderHead(), GetShaderBody());
+}
+
+std::string FragmentShaderColorAA::GetShaderHead() {
+  return SHADER0([]() {
+    precision mediump float;
+    uniform vec4 color;
+    varying vec4 edge_dist[2];  // 8 edge distances.
+  });
+}
+
+std::string FragmentShaderColorAA::GetShaderBody() {
+  return SHADER0([]() {
+    void main() {
+      vec4 d4 = min(edge_dist[0], edge_dist[1]);
+      vec2 d2 = min(d4.xz, d4.yw);
+      float aa = clamp(gl_FragCoord.w * min(d2.x, d2.y), 0.0, 1.0);
+      gl_FragColor = color * aa;
+    }
+  });
+}
+
+FragmentShaderCheckerboard::FragmentShaderCheckerboard()
+    : alpha_location_(-1),
+      tex_transform_location_(-1),
+      frequency_location_(-1) {
+}
+
+void FragmentShaderCheckerboard::Init(GLES2Interface* context,
+                                      unsigned program,
+                                      int* base_uniform_index) {
+  static const char* uniforms[] = {
+      "alpha", "texTransform", "frequency", "color",
+  };
+  int locations[arraysize(uniforms)];
+
+  GetProgramUniformLocations(context,
+                             program,
+                             arraysize(uniforms),
+                             uniforms,
+                             locations,
+                             base_uniform_index);
+  alpha_location_ = locations[0];
+  tex_transform_location_ = locations[1];
+  frequency_location_ = locations[2];
+  color_location_ = locations[3];
+}
+
+std::string FragmentShaderCheckerboard::GetShaderString(
+    TexCoordPrecision precision,
+    SamplerType sampler) const {
+  return FRAGMENT_SHADER(GetShaderHead(), GetShaderBody());
+}
+
+std::string FragmentShaderCheckerboard::GetShaderHead() {
+  return SHADER0([]() {
+    precision mediump float;
+    precision mediump int;
+    varying vec2 v_texCoord;
+    uniform float alpha;
+    uniform float frequency;
+    uniform vec4 texTransform;
+    uniform vec4 color;
+  });
+}
+
+std::string FragmentShaderCheckerboard::GetShaderBody() {
+  // Shader based on Example 13-17 of "OpenGL ES 2.0 Programming Guide"
+  // by Munshi, Ginsburg, Shreiner.
+  return SHADER0([]() {
+    void main() {
+      vec4 color1 = vec4(1.0, 1.0, 1.0, 1.0);
+      vec4 color2 = color;
+      vec2 texCoord =
+          clamp(v_texCoord, 0.0, 1.0) * texTransform.zw + texTransform.xy;
+      vec2 coord = mod(floor(texCoord * frequency * 2.0), 2.0);
+      float picker = abs(coord.x - coord.y);  // NOLINT
+      gl_FragColor = mix(color1, color2, picker) * alpha;
+    }
+  });
+}
+
+}  // namespace cc