Revert 132934 - this change seems to break many webgl related layout tests

gpu/command_buffer/service/gles2_cmd_copy_texture_chromium.cc

Index: gpu/command_buffer/service/gles2_cmd_copy_texture_chromium.cc
===================================================================
--- gpu/command_buffer/service/gles2_cmd_copy_texture_chromium.cc	(revision 132957)
+++ gpu/command_buffer/service/gles2_cmd_copy_texture_chromium.cc	(working copy)
@@ -1,250 +0,0 @@
-// 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 "base/basictypes.h"
-#include "gpu/command_buffer/common/types.h"
-#include "gpu/command_buffer/service/gl_utils.h"
-
-#define SHADER0(Src) #Src
-#define SHADER(Src) SHADER0(Src)
-
-namespace {
-
-const GLfloat kQuadVertices[] = { -1.0f, -1.0f, 0.0f, 1.0f,
-                                   1.0f, -1.0f, 0.0f, 1.0f,
-                                   1.0f,  1.0f, 0.0f, 1.0f,
-                                  -1.0f,  1.0f, 0.0f, 1.0f };
-
-const GLfloat kTextureCoords[] = { 0.0f, 0.0f,
-                                   1.0f, 0.0f,
-                                   1.0f, 1.0f,
-                                   0.0f, 1.0f };
-
-const int kNumShaders = 5;
-enum ShaderId {
-  VERTEX_SHADER_POS_TEX,
-  FRAGMENT_SHADER_TEX,
-  FRAGMENT_SHADER_TEX_FLIP_Y,
-  FRAGMENT_SHADER_TEX_PREMULTIPLY_ALPHA,
-  FRAGMENT_SHADER_TEX_PREMULTIPLY_ALPHA_FLIP_Y
-};
-
-enum ProgramId {
-  PROGRAM_COPY_TEXTURE,
-  PROGRAM_COPY_TEXTURE_FLIP_Y,
-  PROGRAM_COPY_TEXTURE_PREMULTIPLY_ALPHA,
-  PROGRAM_COPY_TEXTURE_PREMULTIPLY_ALPHA_FLIPY
-};
-
-// Returns the correct program to evaluate the copy operation for
-// the CHROMIUM_flipy and premultiply alpha pixel store settings.
-ProgramId GetProgram(bool flip_y, bool premultiply_alpha) {
-  if (flip_y && premultiply_alpha)
-    return PROGRAM_COPY_TEXTURE_PREMULTIPLY_ALPHA_FLIPY;
-
-  if (flip_y)
-    return PROGRAM_COPY_TEXTURE_FLIP_Y;
-
-  if (premultiply_alpha)
-    return PROGRAM_COPY_TEXTURE_PREMULTIPLY_ALPHA;
-
-  return PROGRAM_COPY_TEXTURE;
-}
-
-const char* GetShaderSource(ShaderId shader) {
-  switch (shader) {
-    case VERTEX_SHADER_POS_TEX:
-      return SHADER(
-        precision mediump float;
-        attribute vec4 a_position;
-        attribute vec2 a_texCoord;
-        varying vec2 v_uv;
-        void main(void) {
-          gl_Position = a_position;
-          v_uv = a_texCoord;
-        });
-    case FRAGMENT_SHADER_TEX:
-      return SHADER(
-        precision mediump float;
-        uniform sampler2D u_texSampler;
-        varying vec2 v_uv;
-        void main(void) {
-          gl_FragColor = texture2D(u_texSampler, v_uv.st);
-        });
-    case FRAGMENT_SHADER_TEX_FLIP_Y:
-      return SHADER(
-        precision mediump float;
-        uniform sampler2D u_texSampler;
-        varying vec2 v_uv;
-        void main(void) {
-          gl_FragColor = texture2D(u_texSampler, vec2(v_uv.s, 1.0 - v_uv.t));
-        });
-    case FRAGMENT_SHADER_TEX_PREMULTIPLY_ALPHA:
-      return SHADER(
-        precision mediump float;
-        uniform sampler2D u_texSampler;
-        varying vec2 v_uv;
-        void main(void) {
-          gl_FragColor = texture2D(u_texSampler, v_uv.st);
-          gl_FragColor.rgb *= gl_FragColor.a;
-        });
-    case FRAGMENT_SHADER_TEX_PREMULTIPLY_ALPHA_FLIP_Y:
-      return SHADER(
-        precision mediump float;
-        uniform sampler2D u_texSampler;
-        varying vec2 v_uv;
-        void main(void) {
-          gl_FragColor = texture2D(u_texSampler, vec2(v_uv.s, 1.0 - v_uv.t));
-          gl_FragColor.rgb *= gl_FragColor.a;
-        });
-    default:
-      return 0;
-  }
-}
-
-}  // namespace
-
-void CopyTextureCHROMIUMResourceManager::Initialize() {
-  COMPILE_ASSERT(
-      kVertexPositionAttrib == 0u || kVertexTextureAttrib == 0u,
-      CopyTexture_One_of_these_attribs_must_be_0);
-
-  // Initialize all of the GPU resources required to perform the copy.
-  glGenBuffersARB(2, buffer_ids_);
-  glBindBuffer(GL_ARRAY_BUFFER, buffer_ids_[0]);
-  glBufferData(GL_ARRAY_BUFFER, sizeof(kQuadVertices), kQuadVertices,
-               GL_STATIC_DRAW);
-
-  glBindBuffer(GL_ARRAY_BUFFER, buffer_ids_[1]);
-  glBufferData(GL_ARRAY_BUFFER, sizeof(kTextureCoords), kTextureCoords,
-               GL_STATIC_DRAW);
-
-  glGenFramebuffersEXT(1, &framebuffer_);
-
-  GLuint shaders[kNumShaders];
-  for (int shader = 0; shader < kNumShaders; ++shader) {
-    shaders[shader] = glCreateShader(
-        shader == 0 ? GL_VERTEX_SHADER : GL_FRAGMENT_SHADER);
-    const char* shader_source = GetShaderSource(static_cast<ShaderId>(shader));
-    glShaderSource(shaders[shader], 1, &shader_source, 0);
-    glCompileShader(shaders[shader]);
-#ifndef NDEBUG
-    GLint compile_status;
-    glGetShaderiv(shaders[shader], GL_COMPILE_STATUS, &compile_status);
-    if (GL_TRUE != compile_status)
-      DLOG(ERROR) << "CopyTextureCHROMIUM: shader compilation failure.";
-#endif
-  }
-
-  for (int program = 0; program < kNumPrograms; ++program) {
-    programs_[program] = glCreateProgram();
-    glAttachShader(programs_[program], shaders[0]);
-    glAttachShader(programs_[program], shaders[program + 1]);
-
-    glBindAttribLocation(programs_[program], kVertexPositionAttrib,
-                         "a_position");
-    glBindAttribLocation(programs_[program], kVertexTextureAttrib,
-                         "a_texCoord");
-
-    glLinkProgram(programs_[program]);
-#ifndef NDEBUG
-    GLint linked;
-    glGetProgramiv(programs_[program], GL_LINK_STATUS, &linked);
-    if (!linked)
-      DLOG(ERROR) << "CopyTextureCHROMIUM: program link failure.";
-#endif
-
-    sampler_locations_[program] = glGetUniformLocation(programs_[program],
-                                                      "u_texSampler");
-
-  }
-
-  for (int shader = 0; shader < kNumShaders; ++shader)
-    glDeleteShader(shaders[shader]);
-
-  initialized_ = true;
-}
-
-void CopyTextureCHROMIUMResourceManager::Destroy() {
-  if (!initialized_)
-    return;
-
-  glDeleteFramebuffersEXT(1, &framebuffer_);
-
-  for (int program = 0; program < kNumPrograms; ++program)
-    glDeleteProgram(programs_[program]);
-
-  glDeleteBuffersARB(2, buffer_ids_);
-}
-
-void CopyTextureCHROMIUMResourceManager::DoCopyTexture(
-    GLenum target,
-    GLuint source_id,
-    GLuint dest_id,
-    GLint level,
-    bool flip_y,
-    bool premultiply_alpha) {
-  if (!initialized_) {
-    DLOG(ERROR) << "CopyTextureCHROMIUM: Uninitialized manager.";
-    return;
-  }
-
-  GLuint program = GetProgram(flip_y, premultiply_alpha);
-  glUseProgram(programs_[program]);
-
-#ifndef NDEBUG
-  glValidateProgram(programs_[program]);
-  GLint validation_status;
-  glGetProgramiv(programs_[program], GL_VALIDATE_STATUS, &validation_status);
-  if (GL_TRUE != validation_status) {
-    DLOG(ERROR) << "CopyTextureCHROMIUM: Invalid shader.";
-    return;
-  }
-#endif
-
-  glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, framebuffer_);
-  glFramebufferTexture2DEXT(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, target,
-                            dest_id, level);
-
-#ifndef NDEBUG
-  GLenum fb_status = glCheckFramebufferStatusEXT(GL_FRAMEBUFFER);
-  if (GL_FRAMEBUFFER_COMPLETE != fb_status) {
-    DLOG(ERROR) << "CopyTextureCHROMIUM: Incomplete framebuffer.";
-    return;
-  }
-#endif
-
-  glEnableVertexAttribArray(kVertexPositionAttrib);
-  glEnableVertexAttribArray(kVertexTextureAttrib);
-
-  glBindBuffer(GL_ARRAY_BUFFER, buffer_ids_[0]);
-  glVertexAttribPointer(kVertexPositionAttrib, 4, GL_FLOAT, GL_FALSE,
-                        4 * sizeof(GLfloat), 0);
-
-  glBindBuffer(GL_ARRAY_BUFFER, buffer_ids_[1]);
-  glVertexAttribPointer(kVertexTextureAttrib,  2, GL_FLOAT, GL_FALSE,
-                        2 * sizeof(GLfloat), 0);
-
-  glActiveTexture(GL_TEXTURE0);
-  glUniform1i(sampler_locations_[program], 0);
-
-  glBindTexture(GL_TEXTURE_2D, source_id);
-  glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
-  glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
-  glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
-  glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
-
-  glDisable(GL_DEPTH_TEST);
-  glDisable(GL_SCISSOR_TEST);
-  glDisable(GL_STENCIL_TEST);
-  glDisable(GL_CULL_FACE);
-  glColorMask(GL_TRUE, GL_TRUE, GL_TRUE, GL_TRUE);
-  glDepthMask(GL_FALSE);
-  glDisable(GL_BLEND);
-
-  glDrawArrays(GL_TRIANGLE_FAN, 0, 4);
-}
-