Support glCopyTex[Sub]Image to LUMA formats on the core profile.

gpu/command_buffer/service/gles2_cmd_copy_tex_image.h

+// Copyright (c) 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_COPY_TEX_IMAGE_H_
+#define GPU_COMMAND_BUFFER_SERVICE_GLES2_CMD_COPY_TEX_IMAGE_H_
+
+#include <array>
+
+#include "base/containers/hash_tables.h"
+#include "base/macros.h"
+#include "gpu/command_buffer/service/feature_info.h"
+#include "gpu/command_buffer/service/gl_utils.h"
+#include "gpu/gpu_export.h"
+
+namespace gpu {
+namespace gles2 {
+
+class GLES2Decoder;
+
+}  // namespace gles2.
+
+// This class encapsulates the resources required to implement the
+// glCopyTexImage and glCopyTexSubImage commands.  These commands somtimes
+// require a blit.
+class GPU_EXPORT CopyTexImageResourceManager {
+ public:
+  CopyTexImageResourceManager(const gles2::FeatureInfo* feature_info);

[Zhenyao Mo, 2016/06/01 18:24:18]

explicit

[Geoff Lang, 2016/06/01 20:12:18]

Done.

+  ~CopyTexImageResourceManager();
+
+  void Initialize(const gles2::GLES2Decoder* decoder);
+  void Destroy();
+
+  void DoCopyTexImage2DToLUMAComatabilityTexture(
+      const gles2::GLES2Decoder* decoder,
+      GLuint dest_texture,
+      GLenum dest_texture_target,
+      GLenum dest_target,
+      GLenum luma_format,
+      GLenum luma_type,
+      GLint level,
+      GLenum internal_format,
+      GLint x,
+      GLint y,
+      GLsizei width,
+      GLsizei height,
+      GLuint source_framebuffer,
+      GLenum source_framebuffer_internal_format);
+
+  void DoCopyTexSubImage2DToLUMAComatabilityTexture(
+      const gles2::GLES2Decoder* decoder,
+      GLuint dest_texture,
+      GLenum dest_texture_target,
+      GLenum dest_target,
+      GLenum luma_format,
+      GLenum luma_type,
+      GLint level,
+      GLint xoffset,
+      GLint yoffset,
+      GLint x,
+      GLint y,
+      GLsizei width,
+      GLsizei height,
+      GLuint source_framebuffer,
+      GLenum source_framebuffer_internal_format);
+
+  static bool CopyTexImageRequiresBlit(const gles2::FeatureInfo* feature_info,
+                                       GLenum dest_texture_format);
+
+ private:
+  scoped_refptr<const gles2::FeatureInfo> feature_info_;
+
+  bool initialized_ = false;
+
+  GLuint blit_program_ = 0;
+
+  std::array<GLuint, 2> scratch_textures_ = {{0, 0}};
+  GLuint scratch_fbo_ = 0;
+
+  GLuint vao_ = 0;
+
+  DISALLOW_COPY_AND_ASSIGN(CopyTexImageResourceManager);
+};
+
+}  // namespace gpu.
+
+#endif  // GPU_COMMAND_BUFFER_SERVICE_GLES2_CMD_COPY_TEX_IMAGE_H_