Revert of Extend CopyTextureCHROMIUM to more ES 3.0 texture formats.

gpu/command_buffer/service/gles2_cmd_copy_texture_chromium.cc

 // Copyright (c) 2012 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 "gpu/command_buffer/service/gles2_cmd_copy_texture_chromium.h"
 
 #include <stddef.h>
 
 #include <algorithm>
 
 #include "gpu/command_buffer/service/gl_utils.h"
 #include "gpu/command_buffer/service/gles2_cmd_decoder.h"
-#include "gpu/command_buffer/service/texture_manager.h"
 #include "ui/gl/gl_version_info.h"
 
 namespace {
 
 const GLfloat kIdentityMatrix[16] = {1.0f, 0.0f, 0.0f, 0.0f,
                                      0.0f, 1.0f, 0.0f, 0.0f,
                                      0.0f, 0.0f, 1.0f, 0.0f,
                                      0.0f, 0.0f, 0.0f, 1.0f};
 
-enum {
-  SAMPLER_2D,
-  SAMPLER_RECTANGLE_ARB,
-  SAMPLER_EXTERNAL_OES,
-  NUM_SAMPLERS
+enum FragmentShaderId {
+  FRAGMENT_SHADER_COPY_TEXTURE_2D,
+  FRAGMENT_SHADER_COPY_TEXTURE_RECTANGLE_ARB,
+  FRAGMENT_SHADER_COPY_TEXTURE_EXTERNAL_OES,
+  FRAGMENT_SHADER_COPY_TEXTURE_PREMULTIPLY_ALPHA_2D,
+  FRAGMENT_SHADER_COPY_TEXTURE_PREMULTIPLY_ALPHA_RECTANGLE_ARB,
+  FRAGMENT_SHADER_COPY_TEXTURE_PREMULTIPLY_ALPHA_EXTERNAL_OES,
+  FRAGMENT_SHADER_COPY_TEXTURE_UNPREMULTIPLY_ALPHA_2D,
+  FRAGMENT_SHADER_COPY_TEXTURE_UNPREMULTIPLY_ALPHA_RECTANGLE_ARB,
+  FRAGMENT_SHADER_COPY_TEXTURE_UNPREMULTIPLY_ALPHA_EXTERNAL_OES,
+  NUM_FRAGMENT_SHADERS,
 };
 
-enum {
-  S_FORMAT_ALPHA,
-  S_FORMAT_LUMINANCE,
-  S_FORMAT_LUMINANCE_ALPHA,
-  S_FORMAT_RED,
-  S_FORMAT_RGB,
-  S_FORMAT_RGBA,
-  S_FORMAT_RGB8,
-  S_FORMAT_RGBA8,
-  S_FORMAT_BGRA_EXT,
-  S_FORMAT_BGRA8_EXT,
-  S_FORMAT_RGB_YCBCR_420V_CHROMIUM,
-  S_FORMAT_RGB_YCBCR_422_CHROMIUM,
-  S_FORMAT_COMPRESSED,
-  NUM_S_FORMAT
-};
-
-enum {
-  D_FORMAT_RGB,
-  D_FORMAT_RGBA,
-  D_FORMAT_RGB8,
-  D_FORMAT_RGBA8,
-  D_FORMAT_BGRA_EXT,
-  D_FORMAT_BGRA8_EXT,
-  D_FORMAT_SRGB_EXT,
-  D_FORMAT_SRGB_ALPHA_EXT,
-  D_FORMAT_R8,
-  D_FORMAT_R8UI,
-  D_FORMAT_RG8,
-  D_FORMAT_RG8UI,
-  D_FORMAT_SRGB8,
-  D_FORMAT_RGB565,
-  D_FORMAT_RGB8UI,
-  D_FORMAT_SRGB8_ALPHA8,
-  D_FORMAT_RGB5_A1,
-  D_FORMAT_RGBA4,
-  D_FORMAT_RGBA8UI,
-  D_FORMAT_RGB9_E5,
-  D_FORMAT_R16F,
-  D_FORMAT_R32F,
-  D_FORMAT_RG16F,
-  D_FORMAT_RG32F,
-  D_FORMAT_RGB16F,
-  D_FORMAT_RGB32F,
-  D_FORMAT_RGBA16F,
-  D_FORMAT_RGBA32F,
-  D_FORMAT_R11F_G11F_B10F,
-  NUM_D_FORMAT
-};
-
-const unsigned kNumVertexShaders = NUM_SAMPLERS;
-const unsigned kNumFragmentShaders =
-    4 * NUM_SAMPLERS * NUM_S_FORMAT * NUM_D_FORMAT;
-
-typedef unsigned ShaderId;
-
-ShaderId GetVertexShaderId(GLenum target) {
-  ShaderId id = 0;
-  switch (target) {
-    case GL_TEXTURE_2D:
-      id = SAMPLER_2D;
-      break;
-    case GL_TEXTURE_RECTANGLE_ARB:
-      id = SAMPLER_RECTANGLE_ARB;
-      break;
-    case GL_TEXTURE_EXTERNAL_OES:
-      id = SAMPLER_EXTERNAL_OES;
-      break;
-    default:
-      NOTREACHED();
-      break;
-  }
-  return id;
-}
-
 // Returns the correct fragment shader id to evaluate the copy operation for
 // the premultiply alpha pixel store settings and target.
-ShaderId GetFragmentShaderId(bool premultiply_alpha,
+FragmentShaderId GetFragmentShaderId(bool premultiply_alpha,
                                      bool unpremultiply_alpha,
-                                     GLenum target,
-                                     GLenum source_format,
-                                     GLenum dest_format) {
-  unsigned alphaIndex = 0;
-  unsigned targetIndex = 0;
-  unsigned sourceFormatIndex = 0;
-  unsigned destFormatIndex = 0;
+                                     GLenum target) {
+  enum {
+    SAMPLER_2D,
+    SAMPLER_RECTANGLE_ARB,
+    SAMPLER_EXTERNAL_OES,
+    NUM_SAMPLERS
+  };
 
-  alphaIndex = (premultiply_alpha   ? (1 << 0) : 0) |
-               (unpremultiply_alpha ? (1 << 1) : 0);
+  // bit 0: premultiply alpha
+  // bit 1: unpremultiply alpha
+  static FragmentShaderId shader_ids[][NUM_SAMPLERS] = {
+      {
+       FRAGMENT_SHADER_COPY_TEXTURE_2D,
+       FRAGMENT_SHADER_COPY_TEXTURE_RECTANGLE_ARB,
+       FRAGMENT_SHADER_COPY_TEXTURE_EXTERNAL_OES,
+      },
+      {
+       FRAGMENT_SHADER_COPY_TEXTURE_PREMULTIPLY_ALPHA_2D,
+       FRAGMENT_SHADER_COPY_TEXTURE_PREMULTIPLY_ALPHA_RECTANGLE_ARB,
+       FRAGMENT_SHADER_COPY_TEXTURE_PREMULTIPLY_ALPHA_EXTERNAL_OES,
+      },
+      {
+       FRAGMENT_SHADER_COPY_TEXTURE_UNPREMULTIPLY_ALPHA_2D,
+       FRAGMENT_SHADER_COPY_TEXTURE_UNPREMULTIPLY_ALPHA_RECTANGLE_ARB,
+       FRAGMENT_SHADER_COPY_TEXTURE_UNPREMULTIPLY_ALPHA_EXTERNAL_OES,
+      },
+      {
+       FRAGMENT_SHADER_COPY_TEXTURE_2D,
+       FRAGMENT_SHADER_COPY_TEXTURE_RECTANGLE_ARB,
+       FRAGMENT_SHADER_COPY_TEXTURE_EXTERNAL_OES,
+      }};
+
+  unsigned index = (premultiply_alpha   ? (1 << 0) : 0) |
+                   (unpremultiply_alpha ? (1 << 1) : 0);
 
   switch (target) {
     case GL_TEXTURE_2D:
-      targetIndex = SAMPLER_2D;
-      break;
+      return shader_ids[index][SAMPLER_2D];
     case GL_TEXTURE_RECTANGLE_ARB:
-      targetIndex = SAMPLER_RECTANGLE_ARB;
-      break;
+      return shader_ids[index][SAMPLER_RECTANGLE_ARB];
     case GL_TEXTURE_EXTERNAL_OES:
-      targetIndex = SAMPLER_EXTERNAL_OES;
-      break;
+      return shader_ids[index][SAMPLER_EXTERNAL_OES];
     default:
-      NOTREACHED();
       break;
   }
 
-  switch (source_format) {
-    case GL_ALPHA:
-      sourceFormatIndex = S_FORMAT_ALPHA;
-      break;
-    case GL_LUMINANCE:
-      sourceFormatIndex = S_FORMAT_LUMINANCE;
-      break;
-    case GL_LUMINANCE_ALPHA:
-      sourceFormatIndex = S_FORMAT_LUMINANCE_ALPHA;
-      break;
-    case GL_RED:
-      sourceFormatIndex = S_FORMAT_RED;
-      break;
-    case GL_RGB:
-      sourceFormatIndex = S_FORMAT_RGB;
-      break;
-    case GL_RGBA:
-      sourceFormatIndex = S_FORMAT_RGBA;
-      break;
-    case GL_RGB8:
-      sourceFormatIndex = S_FORMAT_RGB8;
-      break;
-    case GL_RGBA8:
-      sourceFormatIndex = S_FORMAT_RGBA8;
-      break;
-    case GL_BGRA_EXT:
-      sourceFormatIndex = S_FORMAT_BGRA_EXT;
-      break;
-    case GL_BGRA8_EXT:
-      sourceFormatIndex = S_FORMAT_BGRA8_EXT;
-      break;
-    case GL_RGB_YCBCR_420V_CHROMIUM:
-      sourceFormatIndex = S_FORMAT_RGB_YCBCR_420V_CHROMIUM;
-      break;
-    case GL_RGB_YCBCR_422_CHROMIUM:
-      sourceFormatIndex = S_FORMAT_RGB_YCBCR_422_CHROMIUM;
-      break;
-    case GL_ATC_RGB_AMD:
-    case GL_ATC_RGBA_INTERPOLATED_ALPHA_AMD:
-    case GL_COMPRESSED_RGB_S3TC_DXT1_EXT:
-    case GL_COMPRESSED_RGBA_S3TC_DXT5_EXT:
-    case GL_ETC1_RGB8_OES:
-      sourceFormatIndex = S_FORMAT_COMPRESSED;
-      break;
-    default:
-      NOTREACHED();
-      break;
-  }
-
-  switch (dest_format) {
-    case GL_RGB:
-      destFormatIndex = D_FORMAT_RGB;
-      break;
-    case GL_RGBA:
-      destFormatIndex = D_FORMAT_RGBA;
-      break;
-    case GL_RGB8:
-      destFormatIndex = D_FORMAT_RGB8;
-      break;
-    case GL_RGBA8:
-      destFormatIndex = D_FORMAT_RGBA8;
-      break;
-    case GL_BGRA_EXT:
-      destFormatIndex = D_FORMAT_BGRA_EXT;
-      break;
-    case GL_BGRA8_EXT:
-      destFormatIndex = D_FORMAT_BGRA8_EXT;
-      break;
-    case GL_SRGB_EXT:
-      destFormatIndex = D_FORMAT_SRGB_EXT;
-      break;
-    case GL_SRGB_ALPHA_EXT:
-      destFormatIndex = D_FORMAT_SRGB_ALPHA_EXT;
-      break;
-    case GL_R8:
-      destFormatIndex = D_FORMAT_R8;
-      break;
-    case GL_R8UI:
-      destFormatIndex = D_FORMAT_R8UI;
-      break;
-    case GL_RG8:
-      destFormatIndex = D_FORMAT_RG8;
-      break;
-    case GL_RG8UI:
-      destFormatIndex = D_FORMAT_RG8UI;
-      break;
-    case GL_SRGB8:
-      destFormatIndex = D_FORMAT_SRGB8;
-      break;
-    case GL_RGB565:
-      destFormatIndex = D_FORMAT_RGB565;
-      break;
-    case GL_RGB8UI:
-      destFormatIndex = D_FORMAT_RGB8UI;
-      break;
-    case GL_SRGB8_ALPHA8:
-      destFormatIndex = D_FORMAT_SRGB8_ALPHA8;
-      break;
-    case GL_RGB5_A1:
-      destFormatIndex = D_FORMAT_RGB5_A1;
-      break;
-    case GL_RGBA4:
-      destFormatIndex = D_FORMAT_RGBA4;
-      break;
-    case GL_RGBA8UI:
-      destFormatIndex = D_FORMAT_RGBA8UI;
-      break;
-    case GL_RGB9_E5:
-      destFormatIndex = D_FORMAT_RGB9_E5;
-      break;
-    case GL_R16F:
-      destFormatIndex = D_FORMAT_R16F;
-      break;
-    case GL_R32F:
-      destFormatIndex = D_FORMAT_R32F;
-      break;
-    case GL_RG16F:
-      destFormatIndex = D_FORMAT_RG16F;
-      break;
-    case GL_RG32F:
-      destFormatIndex = D_FORMAT_RG32F;
-      break;
-    case GL_RGB16F:
-      destFormatIndex = D_FORMAT_RGB16F;
-      break;
-    case GL_RGB32F:
-      destFormatIndex = D_FORMAT_RGB32F;
-      break;
-    case GL_RGBA16F:
-      destFormatIndex = D_FORMAT_RGBA16F;
-      break;
-    case GL_RGBA32F:
-      destFormatIndex = D_FORMAT_RGBA32F;
-      break;
-    case GL_R11F_G11F_B10F:
-      destFormatIndex = D_FORMAT_R11F_G11F_B10F;
-      break;
-    default:
-      NOTREACHED();
-      break;
-  }
-
-  return alphaIndex + targetIndex * 4 + sourceFormatIndex * 4 * NUM_SAMPLERS +
-         destFormatIndex * 4 * NUM_SAMPLERS * NUM_S_FORMAT;
+  NOTREACHED();
+  return shader_ids[0][SAMPLER_2D];
 }
 
-const char* kShaderPrecisionPreamble =
-    "#ifdef GL_ES\n"
-    "precision mediump float;\n"
-    "#define TexCoordPrecision mediump\n"
-    "#else\n"
-    "#define TexCoordPrecision\n"
-    "#endif\n";
+const char* kShaderPrecisionPreamble = "\
+    #ifdef GL_ES\n\
+    precision mediump float;\n\
+    #define TexCoordPrecision mediump\n\
+    #else\n\
+    #define TexCoordPrecision\n\
+    #endif\n";
 
-std::string GetVertexShaderSource(const gl::GLVersionInfo& gl_version_info,
-                                  GLenum target) {
+std::string GetVertexShaderSource(const gl::GLVersionInfo& gl_version_info) {
   std::string source;
 
-  if (gl_version_info.is_es) {
-    if (gl_version_info.is_es3 && target != GL_TEXTURE_EXTERNAL_OES) {
-      source += "#version 300 es\n";
-      source +=
-          "#define ATTRIBUTE in\n"
-          "#define VARYING out\n";
-    } else {
-      source +=
-          "#define ATTRIBUTE attribute\n"
-          "#define VARYING varying\n";
-    }
+  // Preamble for core and compatibility mode.
+  if (gl_version_info.is_desktop_core_profile) {
+    source += std::string("\
+        #version 150\n\
+        #define ATTRIBUTE in\n\
+        #define VARYING out\n");
   } else {
-    source += "#version 150\n";
-    source +=
-        "#define ATTRIBUTE in\n"
-        "#define VARYING out\n";
+    source += std::string("\
+        #define ATTRIBUTE attribute\n\
+        #define VARYING varying\n");
   }
 
   // Preamble for texture precision.
-  source += kShaderPrecisionPreamble;
+  source += std::string(kShaderPrecisionPreamble);
 
   // Main shader source.
-  source +=
-      "uniform vec2 u_vertex_dest_mult;\n"
-      "uniform vec2 u_vertex_dest_add;\n"
-      "uniform vec2 u_vertex_source_mult;\n"
-      "uniform vec2 u_vertex_source_add;\n"
-      "ATTRIBUTE vec2 a_position;\n"
-      "VARYING TexCoordPrecision vec2 v_uv;\n"
-      "void main(void) {\n"
-      "  gl_Position = vec4(0, 0, 0, 1);\n"
-      "  gl_Position.xy =\n"
-      "      a_position.xy * u_vertex_dest_mult + u_vertex_dest_add;\n"
-      "  v_uv = a_position.xy * u_vertex_source_mult + u_vertex_source_add;\n"
-      "}\n";
+  source += std::string("\
+      uniform vec2 u_vertex_dest_mult;\n\
+      uniform vec2 u_vertex_dest_add;\n\
+      uniform vec2 u_vertex_source_mult;\n\
+      uniform vec2 u_vertex_source_add;\n\
+      ATTRIBUTE vec2 a_position;\n\
+      VARYING TexCoordPrecision vec2 v_uv;\n\
+      void main(void) {\n\
+        gl_Position = vec4(0, 0, 0, 1);\n\
+        gl_Position.xy = a_position.xy * u_vertex_dest_mult + \
+                         u_vertex_dest_add;\n\
+        v_uv = a_position.xy * u_vertex_source_mult + u_vertex_source_add;\n\
+      }\n");
 
   return source;
 }
 
 std::string GetFragmentShaderSource(const gl::GLVersionInfo& gl_version_info,
                                     bool premultiply_alpha,
                                     bool unpremultiply_alpha,
                                     bool nv_egl_stream_consumer_external,
-                                    GLenum target,
-                                    GLenum source_format,
-                                    GLenum dest_format) {
+                                    GLenum target) {
   std::string source;
 
   // Preamble for core and compatibility mode.
-  if (gl_version_info.is_es) {
-    if (gl_version_info.is_es3 && target != GL_TEXTURE_EXTERNAL_OES) {
-      source += "#version 300 es\n";
-    }
-    if (target == GL_TEXTURE_EXTERNAL_OES) {
-      source += "#extension GL_OES_EGL_image_external : enable\n";
-
-      if (nv_egl_stream_consumer_external) {
-        source += "#extension GL_NV_EGL_stream_consumer_external : enable\n";
-      }
-    }
+  if (gl_version_info.is_desktop_core_profile) {
+    source += std::string("\
+        #version 150\n\
+        out vec4 frag_color;\n\
+        #define VARYING in\n\
+        #define FRAGCOLOR frag_color\n\
+        #define TextureLookup texture\n");
   } else {
-    source += "#version 150\n";
-  }
-
-  // Preamble for texture precision.
-  source += kShaderPrecisionPreamble;
-
-  if (gpu::gles2::GLES2Util::IsSignedIntegerFormat(dest_format)) {
-    source += "#define TextureType ivec4\n";
-    source += "#define ZERO 0\n";
-    source += "#define MAX_COLOR 255\n";
-    if (gpu::gles2::GLES2Util::IsSignedIntegerFormat(source_format))
-      source += "#define InnerScaleValue 1\n";
-    else if (gpu::gles2::GLES2Util::IsUnsignedIntegerFormat(source_format))
-      source += "#define InnerScaleValue 1u\n";
-    else
-      source += "#define InnerScaleValue 255.0\n";
-    source += "#define OuterScaleValue 1\n";
-  } else if (gpu::gles2::GLES2Util::IsUnsignedIntegerFormat(dest_format)) {
-    source += "#define TextureType uvec4\n";
-    source += "#define ZERO 0u\n";
-    source += "#define MAX_COLOR 255u\n";
-    if (gpu::gles2::GLES2Util::IsSignedIntegerFormat(source_format))
-      source += "#define InnerScaleValue 1\n";
-    else if (gpu::gles2::GLES2Util::IsUnsignedIntegerFormat(source_format))
-      source += "#define InnerScaleValue 1u\n";
-    else
-      source += "#define InnerScaleValue 255.0\n";
-    source += "#define OuterScaleValue 1u\n";
-  } else {
-    source += "#define TextureType vec4\n";
-    source += "#define ZERO 0.0\n";
-    source += "#define MAX_COLOR 1.0\n";
-    if (gpu::gles2::GLES2Util::IsSignedIntegerFormat(source_format)) {
-      source += "#define InnerScaleValue 1\n";
-      source += "#define OuterScaleValue (1.0 / 255.0)\n";
-    } else if (gpu::gles2::GLES2Util::IsUnsignedIntegerFormat(source_format)) {
-      source += "#define InnerScaleValue 1u\n";
-      source += "#define OuterScaleValue (1.0 / 255.0)\n";
-    } else {
-      source += "#define InnerScaleValue 1.0\n";
-      source += "#define OuterScaleValue 1.0\n";
-    }
-  }
-  if (gl_version_info.is_es2 || target == GL_TEXTURE_EXTERNAL_OES) {
     switch (target) {
       case GL_TEXTURE_2D:
+        source += std::string("#define TextureLookup texture2D\n");
+        break;
+      case GL_TEXTURE_RECTANGLE_ARB:
+        source += std::string("#define TextureLookup texture2DRect\n");
+        break;
       case GL_TEXTURE_EXTERNAL_OES:
-        source += "#define TextureLookup texture2D\n";
+        source +=
+            std::string("#extension GL_OES_EGL_image_external : enable\n");
+
+        if (nv_egl_stream_consumer_external) {
+          source += std::string(
+              "#extension GL_NV_EGL_stream_consumer_external : enable\n");
+        }
+
+        source += std::string("#define TextureLookup texture2D\n");
         break;
       default:
         NOTREACHED();
         break;
     }
-
-    source +=
-        "#define VARYING varying\n"
-        "#define FRAGCOLOR gl_FragColor\n";
-  } else {
-    source +=
-        "#define VARYING in\n"
-        "out TextureType frag_color;\n"
-        "#define FRAGCOLOR frag_color\n"
-        "#define TextureLookup texture\n";
+    source += std::string("\
+        #define VARYING varying\n\
+        #define FRAGCOLOR gl_FragColor\n");
   }
 
   // Preamble for sampler type.
   switch (target) {
     case GL_TEXTURE_2D:
-      source += "#define SamplerType sampler2D\n";
+      source += std::string("#define SamplerType sampler2D\n");
       break;
     case GL_TEXTURE_RECTANGLE_ARB:
-      source += "#define SamplerType sampler2DRect\n";
+      source += std::string("#define SamplerType sampler2DRect\n");
       break;
     case GL_TEXTURE_EXTERNAL_OES:
-      source += "#define SamplerType samplerExternalOES\n";
+      source += std::string("#define SamplerType samplerExternalOES\n");
       break;
     default:
       NOTREACHED();
       break;
   }
 
+  // Preamble for texture precision.
+  source += std::string(kShaderPrecisionPreamble);
+
   // Main shader source.
-  source +=
-      "uniform mediump SamplerType u_sampler;\n"
-      "uniform mat4 u_tex_coord_transform;\n"
-      "VARYING TexCoordPrecision vec2 v_uv;\n"
-      "void main(void) {\n"
-      "  TexCoordPrecision vec4 uv =\n"
-      "      u_tex_coord_transform * vec4(v_uv, 0, 1);\n"
-      "  vec4 color = TextureLookup(u_sampler, uv.st);\n"
-      "  FRAGCOLOR = TextureType(color * InnerScaleValue) * OuterScaleValue;\n";
+  source += std::string("\
+      uniform SamplerType u_sampler;\n\
+      uniform mat4 u_tex_coord_transform;\n\
+      VARYING TexCoordPrecision vec2 v_uv;\n\
+      void main(void) {\n\
+        TexCoordPrecision vec4 uv = u_tex_coord_transform * vec4(v_uv, 0, 1);\n\
+        FRAGCOLOR = TextureLookup(u_sampler, uv.st);\n");
 
   // Post-processing to premultiply or un-premultiply alpha.
-  // Check dest format has alpha channel first.
-  if ((gpu::gles2::GLES2Util::GetChannelsForFormat(dest_format) & 0x0008) !=
-      0) {
-    if (premultiply_alpha) {
-      source += "  FRAGCOLOR.rgb *= FRAGCOLOR.a;\n";
-      source += "  FRAGCOLOR.rgb /= MAX_COLOR;\n";
-    }
-    if (unpremultiply_alpha) {
-      source +=
-          "  if (FRAGCOLOR.a > ZERO) {\n"
-          "    FRAGCOLOR.rgb /= FRAGCOLOR.a;\n"
-          "    FRAGCOLOR.rgb *= MAX_COLOR;\n"
-          "  }\n";
-    }
+  if (premultiply_alpha) {
+    source += std::string("        FRAGCOLOR.rgb *= FRAGCOLOR.a;\n");
+  }
+  if (unpremultiply_alpha) {
+    source += std::string("\
+        if (FRAGCOLOR.a > 0.0)\n\
+          FRAGCOLOR.rgb /= FRAGCOLOR.a;\n");
   }
 
   // Main function end.
-  source += "}\n";
+  source += std::string("      }\n");
 
   return source;
 }
 
-GLenum getIntermediateFormat(GLenum format) {
-  switch (format) {
-    case GL_LUMINANCE_ALPHA:
-    case GL_LUMINANCE:
-    case GL_ALPHA:
-      return GL_RGBA;
-    case GL_SRGB_EXT:
-      return GL_SRGB_ALPHA_EXT;
-    case GL_RGB16F:
-      return GL_RGBA16F;
-    case GL_RGB9_E5:
-    case GL_RGB32F:
-      return GL_RGBA32F;
-    case GL_SRGB8:
-      return GL_SRGB8_ALPHA8;
-    case GL_RGB8UI:
-      return GL_RGBA8UI;
-    default:
-      return format;
-  }
-}
-
 void CompileShader(GLuint shader, const char* shader_source) {
   glShaderSource(shader, 1, &shader_source, 0);
   glCompileShader(shader);
-#if DCHECK_IS_ON()
+#ifndef NDEBUG
   GLint compile_status;
   glGetShaderiv(shader, GL_COMPILE_STATUS, &compile_status);
-  if (GL_TRUE != compile_status) {
-    char buffer[1024];
-    GLsizei length = 0;
-    glGetShaderInfoLog(shader, sizeof(buffer), &length, buffer);
-    std::string log(buffer, length);
-    DLOG(ERROR) << "CopyTextureCHROMIUM: shader compilation failure: " << log;
-  }
+  if (GL_TRUE != compile_status)
+    DLOG(ERROR) << "CopyTextureCHROMIUM: shader compilation failure.";
 #endif
 }
 
 void DeleteShader(GLuint shader) {
   if (shader)
     glDeleteShader(shader);
 }
 
 bool BindFramebufferTexture2D(GLenum target,
                               GLuint texture_id,
@@ skipping 82 matching lines @@
 }
 
 }  // namespace
 
 namespace gpu {
 namespace gles2 {
 
 CopyTextureCHROMIUMResourceManager::CopyTextureCHROMIUMResourceManager()
     : initialized_(false),
       nv_egl_stream_consumer_external_(false),
-      vertex_shaders_(kNumVertexShaders, 0u),
-      fragment_shaders_(kNumFragmentShaders, 0u),
+      vertex_shader_(0u),
+      fragment_shaders_(NUM_FRAGMENT_SHADERS, 0u),
       vertex_array_object_id_(0u),
       buffer_id_(0u),
       framebuffer_(0u) {}
 
 CopyTextureCHROMIUMResourceManager::~CopyTextureCHROMIUMResourceManager() {
   // |buffer_id_| and |framebuffer_| can be not-null because when GPU context is
   // lost, this class can be deleted without releasing resources like
   // GLES2DecoderImpl.
 }
 
@@ skipping 44 matching lines @@
     return;
 
   if (vertex_array_object_id_) {
     glDeleteVertexArraysOES(1, &vertex_array_object_id_);
     vertex_array_object_id_ = 0;
   }
 
   glDeleteFramebuffersEXT(1, &framebuffer_);
   framebuffer_ = 0;
 
-  std::for_each(
-      vertex_shaders_.begin(), vertex_shaders_.end(), DeleteShader);
+  DeleteShader(vertex_shader_);
   std::for_each(
       fragment_shaders_.begin(), fragment_shaders_.end(), DeleteShader);
 
   for (ProgramMap::const_iterator it = programs_.begin(); it != programs_.end();
        ++it) {
     const ProgramInfo& info = it->second;
     glDeleteProgram(info.program);
   }
 
   glDeleteBuffersARB(1, &buffer_id_);
   buffer_id_ = 0;
 }
 
 void CopyTextureCHROMIUMResourceManager::DoCopyTexture(
     const gles2::GLES2Decoder* decoder,
     GLenum source_target,
     GLuint source_id,
     GLenum source_internal_format,
     GLenum dest_target,
     GLuint dest_id,
     GLenum dest_internal_format,
     GLsizei width,
     GLsizei height,
     bool flip_y,
     bool premultiply_alpha,
-    bool unpremultiply_alpha,
-    CopyTextureMethod method) {
+    bool unpremultiply_alpha) {
   bool premultiply_alpha_change = premultiply_alpha ^ unpremultiply_alpha;
-
+  // GL_INVALID_OPERATION is generated if the currently bound framebuffer's
+  // format does not contain a superset of the components required by the base
+  // format of internalformat.
+  // https://www.khronos.org/opengles/sdk/docs/man/xhtml/glCopyTexImage2D.xml
+  bool source_format_contain_superset_of_dest_format =
+      (source_internal_format == dest_internal_format &&
+       source_internal_format != GL_BGRA_EXT) ||
+      (source_internal_format == GL_RGBA && dest_internal_format == GL_RGB);
   // GL_TEXTURE_RECTANGLE_ARB on FBO is supported by OpenGL, not GLES2,
   // so restrict this to GL_TEXTURE_2D.
   if (source_target == GL_TEXTURE_2D && dest_target == GL_TEXTURE_2D &&
-      !flip_y && !premultiply_alpha_change && method == DIRECT_COPY) {
+      !flip_y && !premultiply_alpha_change &&
+      source_format_contain_superset_of_dest_format) {
     DoCopyTexImage2D(decoder,
                      source_target,
                      source_id,
                      dest_target,
                      dest_id,
                      dest_internal_format,
                      width,
                      height,
                      framebuffer_);
     return;
   }
 
-  GLuint dest_texture = dest_id;
-  GLuint intermediate_texture = 0;
-  if (method == DRAW_AND_COPY) {
-    GLenum adjusted_internal_format =
-        getIntermediateFormat(dest_internal_format);
-    glGenTextures(1, &intermediate_texture);
-    glBindTexture(dest_target, intermediate_texture);
-    GLenum format = TextureManager::ExtractFormatFromStorageFormat(
-        adjusted_internal_format);
-    GLenum type =
-        TextureManager::ExtractTypeFromStorageFormat(adjusted_internal_format);
-
-    glTexImage2D(dest_target, 0, adjusted_internal_format, width, height, 0,
-                 format, type, nullptr);
-    dest_texture = intermediate_texture;
-    dest_internal_format = adjusted_internal_format;
-  }
   // Use kIdentityMatrix if no transform passed in.
-  DoCopyTextureWithTransform(
-      decoder, source_target, source_id, source_internal_format, dest_target,
-      dest_texture, dest_internal_format, width, height, flip_y,
-      premultiply_alpha, unpremultiply_alpha, kIdentityMatrix);
-
-  if (method == DRAW_AND_COPY) {
-    DoCopyTexImage2D(decoder, dest_target, intermediate_texture, dest_target,
-                     dest_id, dest_internal_format, width, height,
-                     framebuffer_);
-    glDeleteTextures(1, &intermediate_texture);
-  }
+  DoCopyTextureWithTransform(decoder, source_target, source_id, dest_target,
+                             dest_id, width, height, flip_y, premultiply_alpha,
+                             unpremultiply_alpha, kIdentityMatrix);
 }
 
 void CopyTextureCHROMIUMResourceManager::DoCopySubTexture(
     const gles2::GLES2Decoder* decoder,
     GLenum source_target,
     GLuint source_id,
     GLenum source_internal_format,
     GLenum dest_target,
     GLuint dest_id,
     GLenum dest_internal_format,
     GLint xoffset,
     GLint yoffset,
     GLint x,
     GLint y,
     GLsizei width,
     GLsizei height,
     GLsizei dest_width,
     GLsizei dest_height,
     GLsizei source_width,
     GLsizei source_height,
     bool flip_y,
     bool premultiply_alpha,
-    bool unpremultiply_alpha,
-    CopyTextureMethod method) {
+    bool unpremultiply_alpha) {
   bool use_gl_copy_tex_sub_image_2d = true;
 #if defined(OS_CHROMEOS) && defined(ARCH_CPU_X86_FAMILY)
   // glDrawArrays is faster than glCopyTexSubImage2D on IA Mesa driver,
   // although opposite in Android.
   // TODO(dshwang): After Mesa fixes this issue, remove this hack.
   // https://bugs.freedesktop.org/show_bug.cgi?id=98478 crbug.com/535198
   use_gl_copy_tex_sub_image_2d = false;
 #endif
   bool premultiply_alpha_change = premultiply_alpha ^ unpremultiply_alpha;
-
+  // GL_INVALID_OPERATION is generated if the currently bound framebuffer's
+  // format does not contain a superset of the components required by the base
+  // format of internalformat.
+  // https://www.khronos.org/opengles/sdk/docs/man/xhtml/glCopyTexImage2D.xml
+  bool source_format_contain_superset_of_dest_format =
+      (source_internal_format == dest_internal_format &&
+       source_internal_format != GL_BGRA_EXT) ||
+      (source_internal_format == GL_RGBA && dest_internal_format == GL_RGB);
   // GL_TEXTURE_RECTANGLE_ARB on FBO is supported by OpenGL, not GLES2,
   // so restrict this to GL_TEXTURE_2D.
   if (use_gl_copy_tex_sub_image_2d && source_target == GL_TEXTURE_2D &&
       dest_target == GL_TEXTURE_2D && !flip_y && !premultiply_alpha_change &&
-      method == DIRECT_COPY) {
+      source_format_contain_superset_of_dest_format) {
     DoCopyTexSubImage2D(decoder, source_target, source_id, dest_target, dest_id,
                         xoffset, yoffset, x, y, width, height, framebuffer_);
     return;
   }
 
-  GLint dest_xoffset = xoffset;
-  GLint dest_yoffset = yoffset;
-  GLuint dest_texture = dest_id;
-  GLuint intermediate_texture = 0;
-  if (method == DRAW_AND_COPY) {
-    GLenum adjusted_internal_format =
-        getIntermediateFormat(dest_internal_format);
-    glGenTextures(1, &intermediate_texture);
-    glBindTexture(dest_target, intermediate_texture);
-    GLenum format = TextureManager::ExtractFormatFromStorageFormat(
-        adjusted_internal_format);
-    GLenum type =
-        TextureManager::ExtractTypeFromStorageFormat(adjusted_internal_format);
-
-    glTexImage2D(dest_target, 0, adjusted_internal_format, width, height, 0,
-                 format, type, nullptr);
-    dest_texture = intermediate_texture;
-    dest_internal_format = adjusted_internal_format;
-    dest_xoffset = 0;
-    dest_yoffset = 0;
-    dest_width = width;
-    dest_height = height;
-  }
-
   DoCopySubTextureWithTransform(
       decoder, source_target, source_id, source_internal_format, dest_target,
-      dest_texture, dest_internal_format, dest_xoffset, dest_yoffset, x, y,
-      width, height, dest_width, dest_height, source_width, source_height,
-      flip_y, premultiply_alpha, unpremultiply_alpha, kIdentityMatrix);
-
-  if (method == DRAW_AND_COPY) {
-    DoCopyTexSubImage2D(decoder, dest_target, intermediate_texture, dest_target,
-                        dest_id, xoffset, yoffset, 0, 0, width, height,
-                        framebuffer_);
-    glDeleteTextures(1, &intermediate_texture);
-  }
+      dest_id, dest_internal_format, xoffset, yoffset, x, y, width, height,
+      dest_width, dest_height, source_width, source_height, flip_y,
+      premultiply_alpha, unpremultiply_alpha, kIdentityMatrix);
 }
 
 void CopyTextureCHROMIUMResourceManager::DoCopySubTextureWithTransform(
     const gles2::GLES2Decoder* decoder,
     GLenum source_target,
     GLuint source_id,
     GLenum source_internal_format,
     GLenum dest_target,
     GLuint dest_id,
     GLenum dest_internal_format,
     GLint xoffset,
     GLint yoffset,
     GLint x,
     GLint y,
     GLsizei width,
     GLsizei height,
     GLsizei dest_width,
     GLsizei dest_height,
     GLsizei source_width,
     GLsizei source_height,
     bool flip_y,
     bool premultiply_alpha,
     bool unpremultiply_alpha,
     const GLfloat transform_matrix[16]) {
-  DoCopyTextureInternal(
-      decoder, source_target, source_id, source_internal_format, dest_target,
-      dest_id, dest_internal_format, xoffset, yoffset, x, y, width, height,
-      dest_width, dest_height, source_width, source_height, flip_y,
-      premultiply_alpha, unpremultiply_alpha, transform_matrix);
+  DoCopyTextureInternal(decoder, source_target, source_id, dest_target, dest_id,
+      xoffset, yoffset, x, y, width, height, dest_width, dest_height,
+      source_width, source_height, flip_y, premultiply_alpha,
+      unpremultiply_alpha, transform_matrix);
 }
 
 void CopyTextureCHROMIUMResourceManager::DoCopyTextureWithTransform(
     const gles2::GLES2Decoder* decoder,
     GLenum source_target,
     GLuint source_id,
-    GLenum source_format,
     GLenum dest_target,
     GLuint dest_id,
-    GLenum dest_format,
     GLsizei width,
     GLsizei height,
     bool flip_y,
     bool premultiply_alpha,
     bool unpremultiply_alpha,
     const GLfloat transform_matrix[16]) {
   GLsizei dest_width = width;
   GLsizei dest_height = height;
-  DoCopyTextureInternal(
-      decoder, source_target, source_id, source_format, dest_target, dest_id,
-      dest_format, 0, 0, 0, 0, width, height, dest_width, dest_height, width,
-      height, flip_y, premultiply_alpha, unpremultiply_alpha, transform_matrix);
+  DoCopyTextureInternal(decoder, source_target, source_id, dest_target, dest_id,
+                        0, 0, 0, 0, width, height, dest_width, dest_height,
+                        width, height, flip_y, premultiply_alpha,
+                        unpremultiply_alpha, transform_matrix);
 }
 
 void CopyTextureCHROMIUMResourceManager::DoCopyTextureInternal(
     const gles2::GLES2Decoder* decoder,
     GLenum source_target,
     GLuint source_id,
-    GLenum source_format,
     GLenum dest_target,
     GLuint dest_id,
-    GLenum dest_format,
     GLint xoffset,
     GLint yoffset,
     GLint x,
     GLint y,
     GLsizei width,
     GLsizei height,
     GLsizei dest_width,
     GLsizei dest_height,
     GLsizei source_width,
     GLsizei source_height,
@@ skipping 26 matching lines @@
     glBindVertexArrayOES(vertex_array_object_id_);
   } else {
     if (!gl_version_info.is_desktop_core_profile) {
       decoder->ClearAllAttributes();
     }
     glEnableVertexAttribArray(kVertexPositionAttrib);
     glBindBuffer(GL_ARRAY_BUFFER, buffer_id_);
     glVertexAttribPointer(kVertexPositionAttrib, 2, GL_FLOAT, GL_FALSE, 0, 0);
   }
 
-  ShaderId vertex_shader_id = GetVertexShaderId(source_target);
-  DCHECK_LT(static_cast<size_t>(vertex_shader_id), vertex_shaders_.size());
-  ShaderId fragment_shader_id = GetFragmentShaderId(
-      premultiply_alpha, unpremultiply_alpha, source_target,
-      source_format, dest_format);
+  FragmentShaderId fragment_shader_id = GetFragmentShaderId(
+      premultiply_alpha, unpremultiply_alpha, source_target);
   DCHECK_LT(static_cast<size_t>(fragment_shader_id), fragment_shaders_.size());
 
   ProgramMapKey key(fragment_shader_id);
   ProgramInfo* info = &programs_[key];
   // Create program if necessary.
   if (!info->program) {
     info->program = glCreateProgram();
-    GLuint* vertex_shader = &vertex_shaders_[vertex_shader_id];
-    if (!*vertex_shader) {
-      *vertex_shader = glCreateShader(GL_VERTEX_SHADER);
-      std::string source =
-          GetVertexShaderSource(gl_version_info, source_target);
-      CompileShader(*vertex_shader, source.c_str());
+    if (!vertex_shader_) {
+      vertex_shader_ = glCreateShader(GL_VERTEX_SHADER);
+      std::string source = GetVertexShaderSource(gl_version_info);
+      CompileShader(vertex_shader_, source.c_str());
     }
-    glAttachShader(info->program, *vertex_shader);
+    glAttachShader(info->program, vertex_shader_);
     GLuint* fragment_shader = &fragment_shaders_[fragment_shader_id];
     if (!*fragment_shader) {
       *fragment_shader = glCreateShader(GL_FRAGMENT_SHADER);
       std::string source = GetFragmentShaderSource(
           gl_version_info, premultiply_alpha, unpremultiply_alpha,
-          nv_egl_stream_consumer_external_, source_target, source_format,
-          dest_format);
+          nv_egl_stream_consumer_external_, source_target);
       CompileShader(*fragment_shader, source.c_str());
     }
     glAttachShader(info->program, *fragment_shader);
     glBindAttribLocation(info->program, kVertexPositionAttrib, "a_position");
     glLinkProgram(info->program);
 #ifndef NDEBUG
     GLint linked;
     glGetProgramiv(info->program, GL_LINK_STATUS, &linked);
     if (!linked)
       DLOG(ERROR) << "CopyTextureCHROMIUM: program link failure.";
@@ skipping 130 matching lines @@
   decoder->RestoreTextureUnitBindings(0);
   decoder->RestoreActiveTexture();
   decoder->RestoreProgramBindings();
   decoder->RestoreBufferBindings();
   decoder->RestoreFramebufferBindings();
   decoder->RestoreGlobalState();
 }
 
 }  // namespace gles2
 }  // namespace gpu