gpu: Implement GL_INTEL_framebuffer_CMAA via shaders in the GPU Service

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"
+
+namespace {
+class CMAAEffect;
+}
+
+namespace gpu {
+namespace gles2 {
+class GLES2Decoder;
+class Framebuffer;
+}
+
+// This class encapsulates the resources required to implement the
+// GL_INTEL_framebuffer_CMAA extension via shaders.
+//
+// The CMAA Conservative Morphological Anti-Aliasing) algorithm is applied to
+// all color attachments of the currently bound draw framebuffer.
+//
+// Reference GL_INTEL_framebuffer_CMAA for details.
+class GPU_EXPORT ApplyFramebufferAttachmentCMAAINTELResourceManager {
+ public:
+  ApplyFramebufferAttachmentCMAAINTELResourceManager();
+  ~ApplyFramebufferAttachmentCMAAINTELResourceManager();
+
+  void Initialize(gles2::GLES2Decoder* decoder);
+  void Destroy();
+
+  // Applies the algorithm to the color attachments of the currently bound draw
+  // framebuffer.
+  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);
+  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_