The great shader refactor: Merge fragment shaders into an uber-shader

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 <stddef.h>
 
 #include <algorithm>
 #include <vector>
@@ skipping 752 matching lines @@
     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];          \
   }
 
 FragmentShaderBase::FragmentShaderBase() {}
 
 std::string FragmentShaderBase::GetShaderString(TexCoordPrecision precision,
                                                 SamplerType sampler) const {
+  // The AA shader values will use TexCoordPrecision.
+  if (has_aa_ && precision == TEX_COORD_PRECISION_NA)
+    precision = TEX_COORD_PRECISION_MEDIUM;
   return SetFragmentTexCoordPrecision(
       precision, SetFragmentSamplerType(
                      sampler, SetBlendModeFunctions(GetShaderSource())));
 }
 
 void FragmentShaderBase::Init(GLES2Interface* context,
                               unsigned program,
                               int* base_uniform_index) {
   std::vector<const char*> uniforms;
   std::vector<int> locations;
   if (has_blend_mode()) {
     uniforms.push_back("s_backdropTexture");
     uniforms.push_back("s_originalBackdropTexture");
     uniforms.push_back("backdropRect");
   }
   if (has_mask_sampler_) {
     uniforms.push_back("s_mask");
     uniforms.push_back("maskTexCoordScale");
     uniforms.push_back("maskTexCoordOffset");
   }
   if (has_color_matrix_) {
     uniforms.push_back("colorMatrix");
     uniforms.push_back("colorOffset");
   }
-  if (has_sampler_)
-    uniforms.push_back("s_texture");
   if (has_uniform_alpha_)
     uniforms.push_back("alpha");
   if (has_background_color_)
     uniforms.push_back("background_color");
-  if (has_fragment_tex_transform_)
-    uniforms.push_back("fragmentTexTransform");
-  if (has_uniform_color_)
-    uniforms.push_back("color");
+  switch (input_color_type_) {
+    case INPUT_COLOR_SOURCE_RGBA_TEXTURE:
+      uniforms.push_back("s_texture");
+      if (has_rgba_fragment_tex_transform_)
+        uniforms.push_back("fragmentTexTransform");
+      break;
+    case INPUT_COLOR_SOURCE_UNIFORM:
+      uniforms.push_back("color");
+      break;
+  }
 
   locations.resize(uniforms.size());
 
   GetProgramUniformLocations(context, program, uniforms.size(), uniforms.data(),
                              locations.data(), base_uniform_index);
 
   size_t index = 0;
   if (has_blend_mode()) {
     backdrop_location_ = locations[index++];
     original_backdrop_location_ = locations[index++];
     backdrop_rect_location_ = locations[index++];
   }
   if (has_mask_sampler_) {
     mask_sampler_location_ = locations[index++];
     mask_tex_coord_scale_location_ = locations[index++];
     mask_tex_coord_offset_location_ = locations[index++];
   }
   if (has_color_matrix_) {
     color_matrix_location_ = locations[index++];
     color_offset_location_ = locations[index++];
   }
-  if (has_sampler_)
-    sampler_location_ = locations[index++];
   if (has_uniform_alpha_)
     alpha_location_ = locations[index++];
   if (has_background_color_)
     background_color_location_ = locations[index++];
-  if (has_fragment_tex_transform_)
-    fragment_tex_transform_location_ = locations[index++];
-  if (has_uniform_color_)
-    color_location_ = locations[index++];
+  switch (input_color_type_) {
+    case INPUT_COLOR_SOURCE_RGBA_TEXTURE:
+      sampler_location_ = locations[index++];
+      if (has_rgba_fragment_tex_transform_)
+        fragment_tex_transform_location_ = locations[index++];
+      break;
+    case INPUT_COLOR_SOURCE_UNIFORM:
+      color_location_ = locations[index++];
+      break;
+  }
   DCHECK_EQ(index, locations.size());
 }
 
 void FragmentShaderBase::FillLocations(ShaderLocations* locations) const {
   if (has_blend_mode()) {
     locations->backdrop = backdrop_location_;
     locations->backdrop_rect = backdrop_rect_location_;
   }
   if (mask_for_background())
     locations->original_backdrop = original_backdrop_location_;
   if (has_mask_sampler_) {
     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_;
   }
   if (has_color_matrix_) {
     locations->color_matrix = color_matrix_location_;
     locations->color_offset = color_offset_location_;
   }
-  if (has_sampler_)
-    locations->sampler = sampler_location_;
   if (has_uniform_alpha_)
     locations->alpha = alpha_location_;
+  switch (input_color_type_) {
+    case INPUT_COLOR_SOURCE_RGBA_TEXTURE:
+      locations->sampler = sampler_location_;
+      break;
+    case INPUT_COLOR_SOURCE_UNIFORM:
+      break;
+  }
 }
 
 std::string FragmentShaderBase::SetBlendModeFunctions(
     const 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;
   }
@@ skipping 277 matching lines @@
              "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);";
 }
 
-std::string FragmentShaderRGBATexAlpha::GetShaderSource() const {
-  return SHADER0([]() {
-    precision mediump float;
-    varying TexCoordPrecision vec2 v_texCoord;
-    uniform SamplerType s_texture;
-    uniform float alpha;
-    void main() {
-      vec4 texColor = TextureLookup(s_texture, v_texCoord);
-      gl_FragColor = ApplyBlendMode(texColor * alpha, 0.0);
-    }
-  });
-}
+std::string FragmentShaderBase::GetShaderSource() const {

[enne (OOO), 2017/01/03 21:42:58]

Maybe this should be a followup, but it does seem a bit like some of the other
logic might make more sense here, like SetFragmentSamplerType,
SetFragmentTexCoordPrecision, and SetBlendModeFunctions?  Or, do you think those
should stay separate?

[ccameron, 2017/01/03 22:12:27]

Yeah, they should definitely be handled in a similar way to this. I'll grab them
in a separate patch -- I'm trying to salami-slice this (to help with bisecting
if there are regressions).

+  std::string header = "precision mediump float;\n";
+  std::string source = "void main() {\n";
 
-std::string FragmentShaderRGBATexColorMatrixAlpha::GetShaderSource() const {
-  return SHADER0([]() {
-    precision mediump float;
-    varying TexCoordPrecision vec2 v_texCoord;
-    uniform SamplerType s_texture;
-    uniform float alpha;
-    uniform mat4 colorMatrix;
-    uniform vec4 colorOffset;
-    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);
-    }
-  });
-}
+#define HDR(x) header += x + std::string("\n");

[enne (OOO), 2017/01/03 21:42:58]

Style nit: sure sure, macros are fine, but I like them better when there's no
semicolon in them so that they look like function invocations when used.

[ccameron, 2017/01/03 22:12:27]

Good call. Wrapped them a do{} while(0) to be more-function-like and also
require a semicolon.

+#define SRC(x) source += std::string("  ") + x + std::string("\n");
 
-std::string FragmentShaderRGBATexVaryingAlpha::GetShaderSource() const {
-  return SHADER0([]() {
-    precision mediump float;
-    varying TexCoordPrecision vec2 v_texCoord;
-    varying float v_alpha;
-    uniform SamplerType s_texture;
-    void main() {
-      vec4 texColor = TextureLookup(s_texture, v_texCoord);
-      gl_FragColor = texColor * v_alpha;
-    }
-  });
-}
+  // Read the input into vec4 texColor.
+  switch (input_color_type_) {
+    case INPUT_COLOR_SOURCE_RGBA_TEXTURE:
+      if (has_rgba_as_sampler_2d_)
+        HDR("uniform sampler2D s_texture;")
+      else
+        HDR("uniform SamplerType s_texture;")
+      HDR("varying TexCoordPrecision vec2 v_texCoord;")
+      if (has_rgba_fragment_tex_transform_) {
+        HDR("uniform TexCoordPrecision vec4 fragmentTexTransform;")
+        SRC("// Transformed texture lookup")
+        SRC("TexCoordPrecision vec2 texCoord =")
+        SRC("    clamp(v_texCoord, 0.0, 1.0) * fragmentTexTransform.zw +")
+        SRC("   fragmentTexTransform.xy;")
+        SRC("vec4 texColor = TextureLookup(s_texture, texCoord);")
+        DCHECK(!has_rgba_as_sampler_2d_);
+      } else {
+        SRC("// Texture lookup");
+        if (has_rgba_as_sampler_2d_)
+          SRC("vec4 texColor = texture2D(s_texture, v_texCoord);")
+        else
+          SRC("vec4 texColor = TextureLookup(s_texture, v_texCoord);")
+      }
+      break;
+    case INPUT_COLOR_SOURCE_UNIFORM:
+      DCHECK(!has_rgba_as_sampler_2d_);
+      DCHECK(!has_rgba_fragment_tex_transform_);
+      HDR("uniform vec4 color;")
+      SRC("// Uniform color")
+      SRC("vec4 texColor = color;")
+      break;
+  }
+  // Apply the color matrix to texColor.
+  if (has_color_matrix_) {
+    HDR("uniform mat4 colorMatrix;");
+    HDR("uniform vec4 colorOffset;");
+    SRC("// Apply color matrix")
+    SRC("float nonZeroAlpha = max(texColor.a, 0.00001);")
+    SRC("texColor = vec4(texColor.rgb / nonZeroAlpha, nonZeroAlpha);")
+    SRC("texColor = colorMatrix * texColor + colorOffset;")
+    SRC("texColor.rgb *= texColor.a;")
+    SRC("texColor = clamp(texColor, 0.0, 1.0);")
+  }
 
-std::string FragmentShaderRGBATexPremultiplyAlpha::GetShaderSource() const {
-  return SHADER0([]() {
-    precision mediump float;
-    varying TexCoordPrecision vec2 v_texCoord;
-    varying float v_alpha;
-    uniform SamplerType s_texture;
-    void main() {
-      vec4 texColor = TextureLookup(s_texture, v_texCoord);
-      texColor.rgb *= texColor.a;
-      gl_FragColor = texColor * v_alpha;
-    }
-  });
-}
+  // Read the mask texture.
+  if (has_mask_sampler_) {
+    HDR("uniform SamplerType s_mask;")
+    HDR("uniform vec2 maskTexCoordScale;")
+    HDR("uniform vec2 maskTexCoordOffset;")
+    SRC("// Read the mask")
+    SRC("TexCoordPrecision vec2 maskTexCoord =")
+    SRC("    vec2(maskTexCoordOffset.x + v_texCoord.x * maskTexCoordScale.x,")
+    SRC("         maskTexCoordOffset.y + v_texCoord.y * maskTexCoordScale.y);")
+    SRC("vec4 maskColor = TextureLookup(s_mask, maskTexCoord);")
+  }
 
-std::string FragmentShaderTexBackgroundVaryingAlpha::GetShaderSource() const {
-  return SHADER0([]() {
-    precision mediump float;
-    varying TexCoordPrecision vec2 v_texCoord;
-    varying float v_alpha;
-    uniform vec4 background_color;
-    uniform SamplerType s_texture;
-    void main() {
-      vec4 texColor = TextureLookup(s_texture, v_texCoord);
-      texColor += background_color * (1.0 - texColor.a);
-      gl_FragColor = texColor * v_alpha;
-    }
-  });
-}
+  // Compute AA.
+  if (has_aa_) {
+    HDR("varying TexCoordPrecision vec4 edge_dist[2];  // 8 edge distances.");
+    SRC("// Compute AA")
+    SRC("vec4 d4 = min(edge_dist[0], edge_dist[1]);")
+    SRC("vec2 d2 = min(d4.xz, d4.yw);")
+    SRC("float aa = clamp(gl_FragCoord.w * min(d2.x, d2.y), 0.0, 1.0);")
+  }
 
-std::string FragmentShaderTexBackgroundPremultiplyAlpha::GetShaderSource()
-    const {
-  return SHADER0([]() {
-    precision mediump float;
-    varying TexCoordPrecision vec2 v_texCoord;
-    varying float v_alpha;
-    uniform vec4 background_color;
-    uniform SamplerType s_texture;
-    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;
-    }
-  });
-}
+  // Premultiply by alpha.
+  if (has_premultiply_alpha_) {
+    SRC("// Premultiply alpha")
+    SRC("texColor.rgb *= texColor.a;")
+  }
 
-std::string FragmentShaderRGBATexOpaque::GetShaderSource() const {
-  return SHADER0([]() {
-    precision mediump float;
-    varying TexCoordPrecision vec2 v_texCoord;
-    uniform SamplerType s_texture;
-    void main() {
-      vec4 texColor = TextureLookup(s_texture, v_texCoord);
-      gl_FragColor = vec4(texColor.rgb, 1.0);
-    }
-  });
-}
+  // Apply background texture.
+  if (has_background_color_) {
+    HDR("uniform vec4 background_color;")
+    SRC("// Apply uniform background color blending")
+    SRC("texColor += background_color * (1.0 - texColor.a);")
+  }
 
-std::string FragmentShaderRGBATex::GetShaderSource() const {
-  return SHADER0([]() {
-    precision mediump float;
-    varying TexCoordPrecision vec2 v_texCoord;
-    uniform SamplerType s_texture;
-    void main() { gl_FragColor = TextureLookup(s_texture, v_texCoord); }
-  });
-}
+  // Apply swizzle.
+  if (has_swizzle_) {
+    SRC("// Apply swizzle")
+    SRC("texColor = texColor.bgra;\n")
+  }
 
-std::string FragmentShaderRGBATexSwizzleAlpha::GetShaderSource() const {
-  return SHADER0([]() {
-    precision mediump float;
-    varying TexCoordPrecision vec2 v_texCoord;
-    uniform SamplerType s_texture;
-    uniform float alpha;
-    void main() {
-      vec4 texColor = TextureLookup(s_texture, v_texCoord);
-      gl_FragColor =
-          vec4(texColor.z, texColor.y, texColor.x, texColor.w) * alpha;
-    }
-  });
-}
+  // Include header text for alpha.
+  if (has_uniform_alpha_) {
+    HDR("uniform float alpha;")
+  }
+  if (has_varying_alpha_) {
+    HDR("varying float v_alpha;")
+  }
 
-std::string FragmentShaderRGBATexSwizzleOpaque::GetShaderSource() const {
-  return SHADER0([]() {
-    precision mediump float;
-    varying TexCoordPrecision vec2 v_texCoord;
-    uniform SamplerType s_texture;
-    void main() {
-      vec4 texColor = TextureLookup(s_texture, v_texCoord);
-      gl_FragColor = vec4(texColor.z, texColor.y, texColor.x, 1.0);
-    }
-  });
-}
+  // Apply uniform alpha, aa, varying alpha, and the mask.
+  if (has_varying_alpha_ || has_aa_ || has_uniform_alpha_ ||
+      has_mask_sampler_) {
+    SRC("// Apply alpha from uniform, varying, aa, and mask.")
+    std::string line = "  texColor = texColor";
+    if (has_varying_alpha_)
+      line += " * v_alpha";
+    if (has_uniform_alpha_)
+      line += " * alpha";
+    if (has_aa_)
+      line += " * aa";
+    if (has_mask_sampler_)
+      line += " * maskColor.a";
+    line += ";\n";
+    source += line;
+  }
 
-std::string FragmentShaderRGBATexAlphaAA::GetShaderSource() const {
-  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.
-    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);
-    }
-  });
-}
+  // Write the fragment color.
+  SRC("// Write the fragment color")
+  switch (frag_color_mode_) {
+    case FRAG_COLOR_MODE_DEFAULT:
+      DCHECK_EQ(blend_mode_, BLEND_MODE_NONE);
+      SRC("gl_FragColor = texColor;")
+      break;
+    case FRAG_COLOR_MODE_OPAQUE:
+      DCHECK_EQ(blend_mode_, BLEND_MODE_NONE);
+      SRC("gl_FragColor = vec4(texColor.rgb, 1.0);")
+      break;
+    case FRAG_COLOR_MODE_APPLY_BLEND_MODE:
+      if (has_mask_sampler_)
+        SRC("gl_FragColor = ApplyBlendMode(texColor, maskColor.w);")
+      else
+        SRC("gl_FragColor = ApplyBlendMode(texColor, 0.0);")
+      break;
+  }
+  source += "}\n";
 
-std::string FragmentShaderRGBATexClampAlphaAA::GetShaderSource() const {
-  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.
-    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;
-    }
-  });
-}
+#undef HDR
+#undef SRC
 
-std::string FragmentShaderRGBATexClampSwizzleAlphaAA::GetShaderSource() const {
-  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.
-    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;
-    }
-  });
-}
-
-std::string FragmentShaderRGBATexAlphaMask::GetShaderSource() const {
-  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;
-    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);
-    }
-  });
-}
-
-std::string FragmentShaderRGBATexAlphaMaskAA::GetShaderSource() const {
-  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.
-    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);
-    }
-  });
-}
-
-std::string FragmentShaderRGBATexAlphaMaskColorMatrixAA::GetShaderSource()
-    const {
-  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.
-    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);
-    }
-  });
-}
-
-std::string FragmentShaderRGBATexAlphaColorMatrixAA::GetShaderSource() const {
-  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.
-    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);
-    }
-  });
-}
-
-std::string FragmentShaderRGBATexAlphaMaskColorMatrix::GetShaderSource() const {
-  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;
-    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);
-    }
-  });
+  return header + source;
 }
 
 FragmentShaderYUVVideo::FragmentShaderYUVVideo()
     : y_texture_location_(-1),
       u_texture_location_(-1),
       v_texture_location_(-1),
       uv_texture_location_(-1),
       a_texture_location_(-1),
       lut_texture_location_(-1),
       alpha_location_(-1),
@@ skipping 144 matching lines @@
       vec2 uv_clamped =
           max(uv_clamp_rect.xy, min(uv_clamp_rect.zw, v_uvTexCoord));
       vec3 yuv = vec3(y_raw, GetUV(uv_clamped));
       gl_FragColor = vec4(yuv2rgb(yuv), 1.0) * GetAlpha(ya_clamped);
     }
   });
 
   return head + functions;
 }
 
-std::string FragmentShaderColor::GetShaderSource() const {
-  return SHADER0([]() {
-    precision mediump float;
-    uniform vec4 color;
-    void main() { gl_FragColor = color; }
-  });
-}
-
-std::string FragmentShaderColorAA::GetShaderSource() const {
-  return SHADER0([]() {
-    precision mediump float;
-    uniform vec4 color;
-    varying vec4 edge_dist[2];  // 8 edge distances.
-    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;
-    }
-  });
-}
-
 }  // namespace cc