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// Copyright 2012 The Chromium Authors
// 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_TEXTURE_CHROMIUM_H_
#define GPU_COMMAND_BUFFER_SERVICE_GLES2_CMD_COPY_TEXTURE_CHROMIUM_H_
#include "gpu/command_buffer/common/gles2_cmd_utils.h"
#include "gpu/command_buffer/service/feature_info.h"
#include "gpu/gpu_gles2_export.h"
namespace gpu {
class DecoderContext;
namespace gles2 {
class CopyTexImageResourceManager;
enum class CopyTextureMethod {
// Use CopyTex{Sub}Image2D to copy from the source to the destination.
DIRECT_COPY,
// Draw from the source to the destination texture.
DIRECT_DRAW,
// Draw to an intermediate texture, and then copy to the destination texture.
DRAW_AND_COPY,
// Draw to an intermediate texture in RGBA format, read back pixels in the
// intermediate texture from GPU to CPU, and then upload to the destination
// texture.
DRAW_AND_READBACK,
// CopyTexture isn't available.
NOT_COPYABLE
};
// TODOs(qiankun.miao@intel.com):
// 1. Add readback path for RGB9_E5 and float formats (if extension isn't
// available and they are not color-renderable).
// 2. Support GL_TEXTURE_3D as valid dest_target.
// 3. Support ALPHA, LUMINANCE and LUMINANCE_ALPHA formats on core profile.
// This class encapsulates the resources required to implement the
// GL_CHROMIUM_copy_texture extension. The copy operation is performed
// via glCopyTexImage2D() or a blit to a framebuffer object.
// The target of |dest_id| texture must be GL_TEXTURE_2D.
class GPU_GLES2_EXPORT CopyTextureCHROMIUMResourceManager {
public:
CopyTextureCHROMIUMResourceManager(
const CopyTextureCHROMIUMResourceManager&) = delete;
CopyTextureCHROMIUMResourceManager& operator=(
const CopyTextureCHROMIUMResourceManager&) = delete;
virtual ~CopyTextureCHROMIUMResourceManager();
// Factory generating a real implementation.
static CopyTextureCHROMIUMResourceManager* Create();
virtual void Initialize(
const DecoderContext* decoder,
const gles2::FeatureInfo::FeatureFlags& feature_flags) = 0;
virtual void Destroy() = 0;
virtual void DoCopyTexture(
DecoderContext* decoder,
GLenum source_target,
GLuint source_id,
GLint source_level,
GLenum source_internal_format,
GLenum dest_target,
GLuint dest_id,
GLint dest_level,
GLenum dest_internal_format,
GLsizei width,
GLsizei height,
bool flip_y,
bool premultiply_alpha,
bool unpremultiply_alpha,
CopyTextureMethod method,
CopyTexImageResourceManager* luma_emulation_blitter) = 0;
virtual void DoCopySubTexture(
DecoderContext* decoder,
GLenum source_target,
GLuint source_id,
GLint source_level,
GLenum source_internal_format,
GLenum dest_target,
GLuint dest_id,
GLint dest_level,
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,
CopyTexImageResourceManager* luma_emulation_blitter) = 0;
// The attributes used during invocation of the extension.
static const GLuint kVertexPositionAttrib = 0;
protected:
CopyTextureCHROMIUMResourceManager();
};
} // namespace gles2
} // namespace gpu
#endif // GPU_COMMAND_BUFFER_SERVICE_GLES2_CMD_COPY_TEXTURE_CHROMIUM_H_
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