The great shader refactor: Use ProgramKey to initialize shaders

cc/output/program_binding.h

Index: cc/output/program_binding.h
diff --git a/cc/output/program_binding.h b/cc/output/program_binding.h
index 2c414aed3b0218f6ef9db1395226916d54bc636d..357642db26f1b3cda17ca72953d76e3a7a703224 100644
--- a/cc/output/program_binding.h
+++ b/cc/output/program_binding.h
@@ -54,22 +54,106 @@ class ProgramBindingBase {
   DISALLOW_COPY_AND_ASSIGN(ProgramBindingBase);
 };
 
+enum ProgramType {
+  PROGRAM_TYPE_DEBUG_BORDER,
+  PROGRAM_TYPE_SOLID_COLOR,
+  PROGRAM_TYPE_TILE,
+  PROGRAM_TYPE_TEXTURE,
+  PROGRAM_TYPE_RENDER_PASS,
+  PROGRAM_TYPE_VIDEO_STREAM,
+};
+
+class CC_EXPORT ProgramKey {
+ public:
+  ProgramKey(const ProgramKey& other);
+  ~ProgramKey();
+
+  static ProgramKey DebugBorder();
+  static ProgramKey SolidColor(AAMode aa_mode);
+  static ProgramKey Tile(TexCoordPrecision precision,
+                         SamplerType sampler,
+                         AAMode aa_mode,
+                         SwizzleMode swizzle_mode,
+                         bool is_opaque);
+  static ProgramKey Texture(TexCoordPrecision precision,
+                            SamplerType sampler,
+                            PremultipliedAlphaMode premultiplied_alpha,
+                            bool has_background_color);
+
+  // TODO(ccameron): Merge |mask_for_background| into MaskMode.
+  static ProgramKey RenderPass(TexCoordPrecision precision,
+                               SamplerType sampler,
+                               BlendMode blend_mode,
+                               AAMode aa_mode,
+                               MaskMode mask_mode,
+                               bool mask_for_background,
+                               bool has_color_matrix);
+  static ProgramKey VideoStream(TexCoordPrecision precision);
+
+  bool operator==(const ProgramKey& other) const;
+
+ private:
+  ProgramKey();
+  friend struct ProgramKeyHash;
+  template <class VertexShader, class FragmentShader>
+  friend class ProgramBinding;
+
+  ProgramType type_ = PROGRAM_TYPE_DEBUG_BORDER;
+  TexCoordPrecision precision_ = TEX_COORD_PRECISION_NA;
+  SamplerType sampler_ = SAMPLER_TYPE_NA;
+  BlendMode blend_mode_ = BLEND_MODE_NONE;
+  AAMode aa_mode_ = NO_AA;
+  SwizzleMode swizzle_mode_ = NO_SWIZZLE;
+  bool is_opaque_ = false;
+
+  PremultipliedAlphaMode premultiplied_alpha_ = PREMULTIPLIED_ALPHA;
+  bool has_background_color_ = false;
+
+  MaskMode mask_mode_ = NO_MASK;
+  bool mask_for_background_ = false;
+  bool has_color_matrix_ = false;
+};
+
 template <class VertexShader, class FragmentShader>
 class ProgramBinding : public ProgramBindingBase {
  public:
   ProgramBinding() {}
 
-  void Initialize(ContextProvider* context_provider,
-                  TexCoordPrecision precision,
-                  SamplerType sampler) {
-    Initialize(context_provider, precision, sampler, BLEND_MODE_NONE, false);
-  }
+  void Initialize(ContextProvider* context_provider, const ProgramKey& key) {
+    // Set parameters that are common to all sub-classes.
+    vertex_shader_.aa_mode_ = key.aa_mode_;
+    fragment_shader_.aa_mode_ = key.aa_mode_;
+    fragment_shader_.blend_mode_ = key.blend_mode_;
+    fragment_shader_.tex_coord_precision_ = key.precision_;
+    fragment_shader_.sampler_type_ = key.sampler_;
+    fragment_shader_.swizzle_mode_ = key.swizzle_mode_;
+    fragment_shader_.premultiply_alpha_mode_ = key.premultiplied_alpha_;
+    fragment_shader_.mask_mode_ = key.mask_mode_;
+    fragment_shader_.mask_for_background_ = key.mask_for_background_;
 
-  void Initialize(ContextProvider* context_provider,
-                  TexCoordPrecision precision,
-                  SamplerType sampler,
-                  BlendMode blend_mode) {
-    Initialize(context_provider, precision, sampler, blend_mode, false);
+    switch (key.type_) {
+      case PROGRAM_TYPE_DEBUG_BORDER:
+        InitializeDebugBorderProgram();
+        break;
+      case PROGRAM_TYPE_SOLID_COLOR:
+        InitializeSolidColorProgram(key);
+        break;
+      case PROGRAM_TYPE_TILE:
+        InitializeTileProgram(key);
+        break;
+      case PROGRAM_TYPE_TEXTURE:
+        InitializeTextureProgram(key);
+        break;
+      case PROGRAM_TYPE_RENDER_PASS:
+        InitializeRenderPassProgram(key);
+        break;
+      case PROGRAM_TYPE_VIDEO_STREAM:
+        InitializeVideoStreamProgram(key);
+        break;
+    }
+    fragment_shader_.CheckSubclassProperties();
+    vertex_shader_.CheckSubclassProperties();
+    InitializeInternal(context_provider);
   }
 
   void InitializeVideoYUV(ContextProvider* context_provider,
@@ -78,23 +162,18 @@ class ProgramBinding : public ProgramBindingBase {
                           bool use_alpha_plane,
                           bool use_nv12,
                           bool use_color_lut) {
+    vertex_shader_.tex_coord_source_ = TEX_COORD_SOURCE_ATTRIBUTE;
+    vertex_shader_.has_matrix_ = true;
+    vertex_shader_.is_ya_uv_ = true;
+
     fragment_shader_.use_alpha_texture_ = use_alpha_plane;
     fragment_shader_.use_nv12_ = use_nv12;
     fragment_shader_.use_color_lut_ = use_color_lut;
-    Initialize(context_provider, precision, sampler);
-  }
-
-  void Initialize(ContextProvider* context_provider,
-                  TexCoordPrecision precision,
-                  SamplerType sampler,
-                  BlendMode blend_mode,
-                  bool mask_for_background) {
-    vertex_shader_.SetSubclassProperties();
-    fragment_shader_.SetSubclassProperties();
-    fragment_shader_.blend_mode_ = blend_mode;
-    fragment_shader_.mask_for_background_ = mask_for_background;
     fragment_shader_.tex_coord_precision_ = precision;
     fragment_shader_.sampler_type_ = sampler;
+
+    fragment_shader_.CheckSubclassProperties();
+    vertex_shader_.CheckSubclassProperties();
     InitializeInternal(context_provider);
   }
 
@@ -102,6 +181,105 @@ class ProgramBinding : public ProgramBindingBase {
   const FragmentShader& fragment_shader() const { return fragment_shader_; }
 
  private:
+  void InitializeDebugBorderProgram() {
+    // Initialize vertex program.
+    vertex_shader_.has_matrix_ = true;
+
+    // Initialize fragment program.
+    fragment_shader_.input_color_type_ = INPUT_COLOR_SOURCE_UNIFORM;
+    fragment_shader_.frag_color_mode_ = FRAG_COLOR_MODE_DEFAULT;
+  }
+
+  void InitializeSolidColorProgram(const ProgramKey& key) {
+    // Initialize vertex program.
+    vertex_shader_.position_source_ = POSITION_SOURCE_ATTRIBUTE_INDEXED_UNIFORM;
+    vertex_shader_.has_matrix_ = true;
+#if defined(OS_ANDROID)
+    if (key.aa_mode_ == NO_AA)
+      vertex_shader_.has_dummy_variables_ = true;
+#endif
+
+    // Initialize fragment program.
+    fragment_shader_.input_color_type_ = INPUT_COLOR_SOURCE_UNIFORM;
+    fragment_shader_.frag_color_mode_ = FRAG_COLOR_MODE_DEFAULT;
+  }
+
+  void InitializeTileProgram(const ProgramKey& key) {
+    // Initialize vertex program.
+    vertex_shader_.position_source_ = POSITION_SOURCE_ATTRIBUTE_INDEXED_UNIFORM;
+    vertex_shader_.tex_coord_transform_ = TEX_COORD_TRANSFORM_VEC4;
+    vertex_shader_.tex_coord_source_ = TEX_COORD_SOURCE_ATTRIBUTE;
+    vertex_shader_.has_matrix_ = true;
+
+    // Initialize fragment program.
+    if (key.is_opaque_) {
+      DCHECK_EQ(key.aa_mode_, NO_AA);
+      fragment_shader_.frag_color_mode_ = FRAG_COLOR_MODE_OPAQUE;
+    } else {
+      // TODO(ccameron): This branch shouldn't be needed (this is always
+      // BLEND_MODE_NONE).
+      if (key.aa_mode_ == NO_AA && key.swizzle_mode_ == NO_SWIZZLE)
+        fragment_shader_.frag_color_mode_ = FRAG_COLOR_MODE_APPLY_BLEND_MODE;
+      fragment_shader_.has_uniform_alpha_ = true;
+    }
+
+    // AA changes the texture coordinate mode (affecting both shaders).
+    if (key.aa_mode_ == USE_AA) {
+      vertex_shader_.tex_coord_source_ = TEX_COORD_SOURCE_POSITION;
+      vertex_shader_.aa_mode_ = USE_AA;
+      fragment_shader_.has_rgba_fragment_tex_transform_ = true;
+    }
+  }
+
+  void InitializeTextureProgram(const ProgramKey& key) {
+    // Initialize vertex program.
+    vertex_shader_.tex_coord_source_ = TEX_COORD_SOURCE_ATTRIBUTE;
+    vertex_shader_.tex_coord_transform_ = TEX_COORD_TRANSFORM_VEC4;
+    vertex_shader_.has_matrix_ = true;
+    vertex_shader_.has_vertex_opacity_ = true;
+    vertex_shader_.use_uniform_arrays_ = true;
+
+    // Initialize fragment program.
+    fragment_shader_.has_varying_alpha_ = true;
+    fragment_shader_.has_background_color_ = key.has_background_color_;
+  }
+
+  void InitializeRenderPassProgram(const ProgramKey& key) {
+    // Initialize vertex program.
+    vertex_shader_.has_matrix_ = true;
+    if (key.aa_mode_ == NO_AA) {
+      vertex_shader_.tex_coord_source_ = TEX_COORD_SOURCE_ATTRIBUTE;
+      vertex_shader_.tex_coord_transform_ = TEX_COORD_TRANSFORM_VEC4;
+      vertex_shader_.has_vertex_opacity_ = true;
+      vertex_shader_.use_uniform_arrays_ = true;
+    } else {
+      vertex_shader_.position_source_ =
+          POSITION_SOURCE_ATTRIBUTE_INDEXED_UNIFORM;
+      vertex_shader_.tex_coord_source_ = TEX_COORD_SOURCE_POSITION;
+      vertex_shader_.tex_coord_transform_ = TEX_COORD_TRANSFORM_TRANSLATED_VEC4;
+    }
+
+    // Initialize fragment program.
+    fragment_shader_.frag_color_mode_ = FRAG_COLOR_MODE_APPLY_BLEND_MODE;
+    fragment_shader_.has_uniform_alpha_ = true;
+    fragment_shader_.has_color_matrix_ = key.has_color_matrix_;
+    if (key.mask_mode_ == HAS_MASK) {
+      fragment_shader_.ignore_sampler_type_ = true;
+    } else {
+      DCHECK(!key.mask_for_background_);
+    }
+  }
+
+  void InitializeVideoStreamProgram(const ProgramKey& key) {
+    vertex_shader_.tex_coord_source_ = TEX_COORD_SOURCE_ATTRIBUTE;
+    vertex_shader_.tex_coord_transform_ = TEX_COORD_TRANSFORM_MATRIX;
+    vertex_shader_.has_matrix_ = true;
+
+    fragment_shader_.tex_coord_precision_ = key.precision_;
+    fragment_shader_.sampler_type_ = SAMPLER_TYPE_EXTERNAL_OES;
+    fragment_shader_.frag_color_mode_ = FRAG_COLOR_MODE_DEFAULT;
+  }
+
   void InitializeInternal(ContextProvider* context_provider) {
     DCHECK(context_provider);
     DCHECK(!initialized_);