gpu, cmaa: copy RGBA8 texture via glCopyTexSubImage2D() instead of imageStore().

gpu/command_buffer/service/gles2_cmd_apply_framebuffer_attachment_cmaa_intel.h

 // Copyright 2016 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 GPU_COMMAND_BUFFER_SERVICE_GLES2_CMD_APPLY_FRAMEBUFFER_ATTACHMENT_CMAA_INTEL_H_
 #define GPU_COMMAND_BUFFER_SERVICE_GLES2_CMD_APPLY_FRAMEBUFFER_ATTACHMENT_CMAA_INTEL_H_
 
 #include "gpu/command_buffer/service/gl_utils.h"
 #include "gpu/gpu_export.h"
 
@@ skipping 27 matching lines @@
   void ApplyFramebufferAttachmentCMAAINTEL(gles2::GLES2Decoder* decoder,
                                            gles2::Framebuffer* framebuffer);
 
  private:
   // Applies the CMAA algorithm to a texture.
   void ApplyCMAAEffectTexture(GLuint source_texture, GLuint dest_texture);
 
   void OnSize(GLint width, GLint height);
   void ReleaseTextures();
 
-  void CopyTexture(GLint source, GLint dest, bool via_fbo);
+  void CopyTexture(GLint dest);
   GLuint CreateProgram(const char* defines,
                        const char* vs_source,
                        const char* fs_source);
   GLuint CreateShader(GLenum type, const char* defines, const char* source);
 
   bool initialized_;
   bool textures_initialized_;
   bool is_in_gamma_correct_mode_;
   bool supports_usampler_;
   bool supports_r8_image_;
   bool supports_r8_read_format_;
   bool is_gles31_compatible_;
 
   int frame_id_;
 
   GLint width_;
   GLint height_;
 
-  GLuint copy_to_framebuffer_shader_;
-  GLuint copy_to_image_shader_;
   GLuint edges0_shader_;
   GLuint edges1_shader_;
   GLuint edges_combine_shader_;
   GLuint process_and_apply_shader_;
   GLuint debug_display_edges_shader_;
 
   GLuint cmaa_framebuffer_;
   GLuint copy_framebuffer_;
 
   GLuint rgba8_texture_;
   GLuint working_color_texture_;
   GLuint edges0_texture_;
   GLuint edges1_texture_;
   GLuint mini4_edge_texture_;
   GLuint mini4_edge_depth_texture_;
 
   GLuint edges1_shader_result_texture_float4_slot1_;
   GLuint edges1_shader_result_texture_;
   GLuint edges_combine_shader_result_texture_float4_slot1_;
   GLuint process_and_apply_shader_result_texture_float4_slot1_;
   GLuint edges_combine_shader_result_texture_slot2_;
-  GLuint copy_to_image_shader_outTexture_;
 
   static const char vert_str_[];
   static const char cmaa_frag_s1_[];
   static const char cmaa_frag_s2_[];
-  static const char copy_frag_str_[];
 
   DISALLOW_COPY_AND_ASSIGN(ApplyFramebufferAttachmentCMAAINTELResourceManager);
 };
 
 }  // namespace gpu
 
 #endif  // GPU_COMMAND_BUFFER_SERVICE_GLES2_CMD_APPLY_FRAMEBUFFER_ATTACHMENT_CMAA_INTEL_H_