The great shader refactor: Add YUV support to the uber shader

cc/output/shader.h

 // 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.
 
 #ifndef CC_OUTPUT_SHADER_H_
 #define CC_OUTPUT_SHADER_H_
 
 #include <string>
 
 #include "base/logging.h"
@@ skipping 96 matching lines @@
 
 enum InputColorSource {
   // This includes RGB and RGBA textures.
   INPUT_COLOR_SOURCE_RGBA_TEXTURE,
   // This includes Y and either UV or U-and-V textures.
   INPUT_COLOR_SOURCE_YUV_TEXTURES,
   // A solid color specified as a uniform value.
   INPUT_COLOR_SOURCE_UNIFORM,
 };
 
+enum UVTextureMode {
+  // Shader does not use YUV textures.
+  UV_TEXTURE_MODE_NA,
+  // UV plane is a single texture.
+  UV_TEXTURE_MODE_UV,
+  // U and V planes have separate textures.
+  UV_TEXTURE_MODE_U_V,
+};
+
+enum YUVAlphaTextureMode {
+  YUV_ALPHA_TEXTURE_MODE_NA,
+  YUV_NO_ALPHA_TEXTURE,
+  YUV_HAS_ALPHA_TEXTURE,
+};
+
+enum ColorConversionMode {
+  // No color conversion is performed.
+  COLOR_CONVERSION_MODE_NONE,
+  // Conversion is done directly from YUV to output RGB space, via a 3D texture
+  // represented as a 2D texture.
+  COLOR_CONVERSION_MODE_2D_LUT_AS_3D_FROM_YUV,
+};
+
 // TODO(ccameron): Merge this with BlendMode.
 enum FragColorMode {
   FRAG_COLOR_MODE_DEFAULT,
   FRAG_COLOR_MODE_OPAQUE,
   FRAG_COLOR_MODE_APPLY_BLEND_MODE,
 };
 
 enum MaskMode {
   NO_MASK = 0,
   HAS_MASK = 1,
@@ skipping 122 matching lines @@
   bool has_background_color_ = false;
   int background_color_location_ = -1;
 
   TexCoordPrecision tex_coord_precision_ = TEX_COORD_PRECISION_NA;
   SamplerType sampler_type_ = SAMPLER_TYPE_NA;
 
   BlendMode blend_mode_ = BLEND_MODE_NONE;
   bool mask_for_background_ = false;
 
   // YUV-only parameters.
-  bool use_alpha_texture_ = false;
-  bool use_nv12_ = false;
-  bool use_color_lut_ = false;
+  YUVAlphaTextureMode yuv_alpha_texture_mode_ = YUV_ALPHA_TEXTURE_MODE_NA;
+  UVTextureMode uv_texture_mode_ = UV_TEXTURE_MODE_UV;
+
+  ColorConversionMode color_conversion_mode_ = COLOR_CONVERSION_MODE_NONE;
 
   // YUV uniform locations.
   int y_texture_location_ = -1;
   int u_texture_location_ = -1;
   int v_texture_location_ = -1;
   int uv_texture_location_ = -1;
   int a_texture_location_ = -1;
   int lut_texture_location_ = -1;
   int yuv_matrix_location_ = -1;
   int yuv_adj_location_ = -1;
@@ skipping 14 matching lines @@
   std::string GetHelperFunctions() const;
   std::string GetBlendFunction() const;
   std::string GetBlendFunctionBodyForRGB() const;
 
   DISALLOW_COPY_AND_ASSIGN(FragmentShader);
 };
 
 }  // namespace cc
 
 #endif  // CC_OUTPUT_SHADER_H_