cc: Cleanup vertex shaders used for anti-aliasing.

Splits VertexShaderQuad into VertexShaderQuad and VertexShaderQuadTex.
VertexShaderQuadTex is used for drawing textures and VertexShaderQuad is
used for solid color.

Use array indexing in VertexShaderQuad program.

BUG=238644
TEST=cc_unittests --gtest_filter=GLRendererPixelTest.AntiAliasing
R=enne@chromium.org

Review URL: https://codereview.chromium.org/12720017

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@198898 0039d316-1c4b-4281-b951-d872f2087c98

5 files changed, 112 insertions, 60 deletions

diff --git a/cc/output/gl_renderer.cc b/cc/output/gl_renderer.cc
index c33fa47..72c531e 100644
--- a/cc/output/gl_renderer.cc
+++ b/cc/output/gl_renderer.cc
@@ -794,7 +794,7 @@ void GLRenderer::DrawRenderPassQuad(DrawingFrame* frame,
     GLC(Context(),
         Context()->uniform1i(program->fragment_shader().sampler_location(), 0));
 
-    shader_quad_location = program->vertex_shader().point_location();
+    shader_quad_location = program->vertex_shader().quad_location();
     shader_edge_location = program->fragment_shader().edge_location();
     shader_mask_sampler_location =
         program->fragment_shader().mask_sampler_location();
@@ -829,7 +829,7 @@ void GLRenderer::DrawRenderPassQuad(DrawingFrame* frame,
     GLC(Context(),
         Context()->uniform1i(program->fragment_shader().sampler_location(), 0));
 
-    shader_quad_location = program->vertex_shader().point_location();
+    shader_quad_location = program->vertex_shader().quad_location();
     shader_edge_location = program->fragment_shader().edge_location();
     shader_matrix_location = program->vertex_shader().matrix_location();
     shader_alpha_location = program->fragment_shader().alpha_location();
@@ -842,7 +842,7 @@ void GLRenderer::DrawRenderPassQuad(DrawingFrame* frame,
         Context()->uniform1i(program->fragment_shader().sampler_location(), 0));
 
     shader_matrix_location = program->vertex_shader().matrix_location();
-    shader_quad_location = program->vertex_shader().point_location();
+    shader_quad_location = program->vertex_shader().quad_location();
     shader_tex_scale_location = program->vertex_shader().tex_scale_location();
     shader_edge_location = program->fragment_shader().edge_location();
     shader_alpha_location = program->fragment_shader().alpha_location();
@@ -864,7 +864,7 @@ void GLRenderer::DrawRenderPassQuad(DrawingFrame* frame,
         Context()->uniform1i(program->fragment_shader().sampler_location(), 0));
 
     shader_matrix_location = program->vertex_shader().matrix_location();
-    shader_quad_location = program->vertex_shader().point_location();
+    shader_quad_location = program->vertex_shader().quad_location();
     shader_tex_scale_location = program->vertex_shader().tex_scale_location();
     shader_edge_location = program->fragment_shader().edge_location();
     shader_alpha_location = program->fragment_shader().alpha_location();
@@ -1009,8 +1009,7 @@ struct SolidColorProgramUniforms {
   unsigned program;
   unsigned matrix_location;
   unsigned color_location;
-  unsigned point_location;
-  unsigned tex_scale_location;
+  unsigned quad_location;
   unsigned edge_location;
 };
 
@@ -1020,8 +1019,7 @@ static void SolidColorUniformLocation(T program,
   uniforms->program = program->program();
   uniforms->matrix_location = program->vertex_shader().matrix_location();
   uniforms->color_location = program->fragment_shader().color_location();
-  uniforms->point_location = program->vertex_shader().point_location();
-  uniforms->tex_scale_location = program->vertex_shader().tex_scale_location();
+  uniforms->quad_location = program->vertex_shader().quad_location();
   uniforms->edge_location = program->fragment_shader().edge_location();
 }
 
@@ -1112,7 +1110,6 @@ bool GLRenderer::SetupQuadForAntialiasing(
 
 void GLRenderer::DrawSolidColorQuad(const DrawingFrame* frame,
                                     const SolidColorDrawQuad* quad) {
-  SetBlendEnabled(quad->ShouldDrawWithBlending());
   gfx::Rect tile_rect = quad->visible_rect;
 
   SkColor color = quad->color;
@@ -1159,7 +1156,7 @@ void GLRenderer::DrawSolidColorQuad(const DrawingFrame* frame,
   // Normalize to tile_rect.
   local_quad.Scale(1.0f / tile_rect.width(), 1.0f / tile_rect.height());
 
-  SetShaderQuadF(local_quad, uniforms.point_location);
+  SetShaderQuadF(local_quad, uniforms.quad_location);
 
   // The transform and vertex data are used to figure out the extents that the
   // un-antialiased quad should have and which vertex this is and the float
@@ -1180,7 +1177,7 @@ struct TileProgramUniforms {
   unsigned edge_location;
   unsigned matrix_location;
   unsigned alpha_location;
-  unsigned point_location;
+  unsigned quad_location;
 };
 
 template <class T>
@@ -1189,7 +1186,7 @@ static void TileUniformLocation(T program, TileProgramUniforms* uniforms) {
   uniforms->vertex_tex_transform_location =
       program->vertex_shader().vertex_tex_transform_location();
   uniforms->matrix_location = program->vertex_shader().matrix_location();
-  uniforms->point_location = program->vertex_shader().point_location();
+  uniforms->quad_location = program->vertex_shader().quad_location();
 
   uniforms->sampler_location = program->fragment_shader().sampler_location();
   uniforms->alpha_location = program->fragment_shader().alpha_location();
@@ -1353,7 +1350,7 @@ void GLRenderer::DrawContentQuad(const DrawingFrame* frame,
   local_quad.Scale(1.0f / tile_rect.width(), 1.0f / tile_rect.height());
 
   SetShaderOpacity(quad->opacity(), uniforms.alpha_location);
-  SetShaderQuadF(local_quad, uniforms.point_location);
+  SetShaderQuadF(local_quad, uniforms.quad_location);
 
   // The transform and vertex data are used to figure out the extents that the
   // un-antialiased quad should have and which vertex this is and the float
@@ -1818,16 +1815,16 @@ void GLRenderer::SetShaderQuadF(const gfx::QuadF& quad, int quad_location) {
   if (quad_location == -1)
     return;
 
-  float point[8];
-  point[0] = quad.p1().x();
-  point[1] = quad.p1().y();
-  point[2] = quad.p2().x();
-  point[3] = quad.p2().y();
-  point[4] = quad.p3().x();
-  point[5] = quad.p3().y();
-  point[6] = quad.p4().x();
-  point[7] = quad.p4().y();
-  GLC(context_, context_->uniform2fv(quad_location, 4, point));
+  float gl_quad[8];
+  gl_quad[0] = quad.p1().x();
+  gl_quad[1] = quad.p1().y();
+  gl_quad[2] = quad.p2().x();
+  gl_quad[3] = quad.p2().y();
+  gl_quad[4] = quad.p3().x();
+  gl_quad[5] = quad.p3().y();
+  gl_quad[6] = quad.p4().x();
+  gl_quad[7] = quad.p4().y();
+  GLC(context_, context_->uniform2fv(quad_location, 4, gl_quad));
 }
 
 void GLRenderer::SetShaderOpacity(float opacity, int alpha_location) {
diff --git a/cc/output/gl_renderer.h b/cc/output/gl_renderer.h
index 24677d9..17bd8b5 100644
--- a/cc/output/gl_renderer.h
+++ b/cc/output/gl_renderer.h
@@ -253,17 +253,17 @@ class CC_EXPORT GLRenderer
                          FragmentShaderRGBATexAlpha> RenderPassProgram;
   typedef ProgramBinding<VertexShaderPosTexTransform,
                          FragmentShaderRGBATexAlphaMask> RenderPassMaskProgram;
-  typedef ProgramBinding<VertexShaderQuad, FragmentShaderRGBATexAlphaAA>
+  typedef ProgramBinding<VertexShaderQuadTex, FragmentShaderRGBATexAlphaAA>
       RenderPassProgramAA;
-  typedef ProgramBinding<VertexShaderQuad, FragmentShaderRGBATexAlphaMaskAA>
+  typedef ProgramBinding<VertexShaderQuadTex, FragmentShaderRGBATexAlphaMaskAA>
       RenderPassMaskProgramAA;
   typedef ProgramBinding<VertexShaderPosTexTransform,
                          FragmentShaderRGBATexColorMatrixAlpha>
       RenderPassColorMatrixProgram;
-  typedef ProgramBinding<VertexShaderQuad,
+  typedef ProgramBinding<VertexShaderQuadTex,
                          FragmentShaderRGBATexAlphaMaskColorMatrixAA>
       RenderPassMaskColorMatrixProgramAA;
-  typedef ProgramBinding<VertexShaderQuad,
+  typedef ProgramBinding<VertexShaderQuadTex,
                          FragmentShaderRGBATexAlphaColorMatrixAA>
       RenderPassColorMatrixProgramAA;
   typedef ProgramBinding<VertexShaderPosTexTransform,
diff --git a/cc/output/shader.cc b/cc/output/shader.cc
index aaaeefb..c4ffd0e 100644
--- a/cc/output/shader.cc
+++ b/cc/output/shader.cc
@@ -323,8 +323,7 @@ std::string VertexShaderPosTexIdentity::GetShaderString() const {
 
 VertexShaderQuad::VertexShaderQuad()
     : matrix_location_(-1),
-      point_location_(-1),
-      tex_scale_location_(-1) {}
+      quad_location_(-1) {}
 
 void VertexShaderQuad::Init(WebGraphicsContext3D* context,
                             unsigned program,
@@ -332,7 +331,51 @@ void VertexShaderQuad::Init(WebGraphicsContext3D* context,
                             int* base_uniform_index) {
   static const char* shader_uniforms[] = {
     "matrix",
-    "point",
+    "quad",
+  };
+  int locations[2];
+
+  GetProgramUniformLocations(context,
+                             program,
+                             shader_uniforms,
+                             arraysize(shader_uniforms),
+                             arraysize(locations),
+                             locations,
+                             using_bind_uniform,
+                             base_uniform_index);
+
+  matrix_location_ = locations[0];
+  quad_location_ = locations[1];
+  DCHECK_NE(matrix_location_, -1);
+  DCHECK_NE(quad_location_, -1);
+}
+
+std::string VertexShaderQuad::GetShaderString() const {
+  return VERTEX_SHADER(
+    attribute TexCoordPrecision vec4 a_position;
+    attribute float a_index;
+    uniform mat4 matrix;
+    uniform TexCoordPrecision vec2 quad[4];
+    void main() {
+      vec2 pos = quad[int(a_index)];  // NOLINT
+      gl_Position = matrix * vec4(
+          pos.x, pos.y, a_position.z, a_position.w);
+    }
+  );  // NOLINT(whitespace/parens)
+}
+
+VertexShaderQuadTex::VertexShaderQuadTex()
+    : matrix_location_(-1),
+      quad_location_(-1),
+      tex_scale_location_(-1) {}
+
+void VertexShaderQuadTex::Init(WebGraphicsContext3D* context,
+                               unsigned program,
+                               bool using_bind_uniform,
+                               int* base_uniform_index) {
+  static const char* shader_uniforms[] = {
+    "matrix",
+    "quad",
     "texScale",
   };
   int locations[3];
@@ -347,29 +390,25 @@ void VertexShaderQuad::Init(WebGraphicsContext3D* context,
                              base_uniform_index);
 
   matrix_location_ = locations[0];
-  point_location_ = locations[1];
+  quad_location_ = locations[1];
   tex_scale_location_ = locations[2];
   DCHECK_NE(matrix_location_, -1);
-  DCHECK_NE(point_location_, -1);
+  DCHECK_NE(quad_location_, -1);
   DCHECK_NE(tex_scale_location_, -1);
 }
 
-std::string VertexShaderQuad::GetShaderString() const {
+std::string VertexShaderQuadTex::GetShaderString() const {
   return VERTEX_SHADER(
     attribute TexCoordPrecision vec4 a_position;
-    attribute TexCoordPrecision vec2 a_texCoord;
+    attribute float a_index;
     uniform mat4 matrix;
-    uniform TexCoordPrecision vec2 point[4];
+    uniform TexCoordPrecision vec2 quad[4];
     uniform TexCoordPrecision vec2 texScale;
     varying TexCoordPrecision vec2 v_texCoord;
     void main() {
-      TexCoordPrecision vec2 complement = abs(a_texCoord - 1.0);
-      TexCoordPrecision vec4 pos = vec4(0.0, 0.0, a_position.z, a_position.w);
-      pos.xy += (complement.x * complement.y) * point[0];
-      pos.xy += (a_texCoord.x * complement.y) * point[1];
-      pos.xy += (a_texCoord.x * a_texCoord.y) * point[2];
-      pos.xy += (complement.x * a_texCoord.y) * point[3];
-      gl_Position = matrix * pos;
+      vec2 pos = quad[int(a_index)];  // NOLINT
+      gl_Position = matrix * vec4(
+          pos.x, pos.y, a_position.z, a_position.w);
       v_texCoord = (pos.xy + vec2(0.5)) * texScale;
     }
   );  // NOLINT(whitespace/parens)
@@ -377,7 +416,7 @@ std::string VertexShaderQuad::GetShaderString() const {
 
 VertexShaderTile::VertexShaderTile()
     : matrix_location_(-1),
-      point_location_(-1),
+      quad_location_(-1),
       vertex_tex_transform_location_(-1) {}
 
 void VertexShaderTile::Init(WebGraphicsContext3D* context,
@@ -386,7 +425,7 @@ void VertexShaderTile::Init(WebGraphicsContext3D* context,
                             int* base_uniform_index) {
   static const char* shader_uniforms[] = {
     "matrix",
-    "point",
+    "quad",
     "vertexTexTransform",
   };
   int locations[3];
@@ -401,28 +440,24 @@ void VertexShaderTile::Init(WebGraphicsContext3D* context,
                              base_uniform_index);
 
   matrix_location_ = locations[0];
-  point_location_ = locations[1];
+  quad_location_ = locations[1];
   vertex_tex_transform_location_ = locations[2];
-  DCHECK(matrix_location_ != -1 && point_location_ != -1 &&
+  DCHECK(matrix_location_ != -1 && quad_location_ != -1 &&
          vertex_tex_transform_location_ != -1);
 }
 
 std::string VertexShaderTile::GetShaderString() const {
   return VERTEX_SHADER(
     attribute TexCoordPrecision vec4 a_position;
-    attribute TexCoordPrecision vec2 a_texCoord;
+    attribute float a_index;
     uniform mat4 matrix;
-    uniform TexCoordPrecision vec2 point[4];
+    uniform TexCoordPrecision vec2 quad[4];
     uniform TexCoordPrecision vec4 vertexTexTransform;
     varying TexCoordPrecision vec2 v_texCoord;
     void main() {
-      TexCoordPrecision vec2 complement = abs(a_texCoord - 1.0);
-      TexCoordPrecision vec4 pos = vec4(0.0, 0.0, a_position.z, a_position.w);
-      pos.xy += (complement.x * complement.y) * point[0];
-      pos.xy += (a_texCoord.x * complement.y) * point[1];
-      pos.xy += (a_texCoord.x * a_texCoord.y) * point[2];
-      pos.xy += (complement.x * a_texCoord.y) * point[3];
-      gl_Position = matrix * pos;
+      vec2 pos = quad[int(a_index)];  // NOLINT
+      gl_Position = matrix * vec4(
+          pos.x, pos.y, a_position.z, a_position.w);
       v_texCoord = pos.xy * vertexTexTransform.zw + vertexTexTransform.xy;
     }
   );  // NOLINT(whitespace/parens)
diff --git a/cc/output/shader.h b/cc/output/shader.h
index 155efce..9b76ca2c 100644
--- a/cc/output/shader.h
+++ b/cc/output/shader.h
@@ -147,15 +147,35 @@ class VertexShaderQuad {
   std::string GetShaderString() const;
 
   int matrix_location() const { return matrix_location_; }
-  int point_location() const { return point_location_; }
+  int quad_location() const { return quad_location_; }
+
+ private:
+  int matrix_location_;
+  int quad_location_;
+
+  DISALLOW_COPY_AND_ASSIGN(VertexShaderQuad);
+};
+
+class VertexShaderQuadTex {
+ public:
+  VertexShaderQuadTex();
+
+  void Init(WebKit::WebGraphicsContext3D* context,
+           unsigned program,
+           bool using_bind_uniform,
+           int* base_uniform_index);
+  std::string GetShaderString() const;
+
+  int matrix_location() const { return matrix_location_; }
+  int quad_location() const { return quad_location_; }
   int tex_scale_location() const { return tex_scale_location_; }
 
  private:
   int matrix_location_;
-  int point_location_;
+  int quad_location_;
   int tex_scale_location_;
 
-  DISALLOW_COPY_AND_ASSIGN(VertexShaderQuad);
+  DISALLOW_COPY_AND_ASSIGN(VertexShaderQuadTex);
 };
 
 class VertexShaderTile {
@@ -169,14 +189,14 @@ class VertexShaderTile {
   std::string GetShaderString() const;
 
   int matrix_location() const { return matrix_location_; }
-  int point_location() const { return point_location_; }
+  int quad_location() const { return quad_location_; }
   int vertex_tex_transform_location() const {
     return vertex_tex_transform_location_;
   }
 
  private:
   int matrix_location_;
-  int point_location_;
+  int quad_location_;
   int vertex_tex_transform_location_;
 
   DISALLOW_COPY_AND_ASSIGN(VertexShaderTile);
diff --git a/cc/test/data/background_filter_blur_off_axis.png b/cc/test/data/background_filter_blur_off_axis.png
index 8d3f9ad..b2bfef4 100644
--- a/cc/test/data/background_filter_blur_off_axis.png
+++ b/cc/test/data/background_filter_blur_off_axis.png