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// 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.
// This file contains the GLES2Decoder class.
#include <stdint.h>
#include <string>
#include <vector>
#include "base/callback_forward.h"
#include "base/macros.h"
#include "base/memory/ref_counted.h"
#include "base/memory/weak_ptr.h"
#include "base/time/time.h"
#include "build/build_config.h"
#include "gpu/command_buffer/common/capabilities.h"
#include "gpu/command_buffer/common/command_buffer_id.h"
#include "gpu/command_buffer/common/constants.h"
#include "gpu/command_buffer/common/context_result.h"
#include "gpu/command_buffer/service/common_decoder.h"
#include "gpu/command_buffer/service/decoder_context.h"
#include "gpu/gpu_gles2_export.h"
namespace gl {
class GLSurface;
namespace gfx {
class Size;
namespace gpu {
class DecoderClient;
struct Mailbox;
namespace gles2 {
class ContextGroup;
class CopyTexImageResourceManager;
class CopyTextureCHROMIUMResourceManager;
class FramebufferManager;
class GLES2Util;
class ImageManager;
class Logger;
class Outputter;
class ShaderTranslatorInterface;
class TransformFeedbackManager;
class VertexArrayManager;
struct DisallowedFeatures {
DisallowedFeatures() = default;
void AllowExtensions() {
chromium_color_buffer_float_rgba = false;
chromium_color_buffer_float_rgb = false;
ext_color_buffer_float = false;
ext_color_buffer_half_float = false;
oes_texture_float_linear = false;
oes_texture_half_float_linear = false;
ext_float_blend = false;
bool operator==(const DisallowedFeatures& other) const {
return !std::memcmp(this, &other, sizeof(*this));
bool npot_support = false;
bool chromium_color_buffer_float_rgba = false;
bool chromium_color_buffer_float_rgb = false;
bool ext_color_buffer_float = false;
bool ext_color_buffer_half_float = false;
bool oes_texture_float_linear = false;
bool oes_texture_half_float_linear = false;
bool ext_float_blend = false;
// This class implements the DecoderContext interface, decoding GLES2
// commands and calling GL.
class GPU_GLES2_EXPORT GLES2Decoder : public CommonDecoder,
public DecoderContext {
typedef error::Error Error;
// The default stencil mask, which has all bits set. This really should be a
// GLuint, but we can't #include gl_bindings.h in this file without causing
// macro redefinitions.
static const unsigned int kDefaultStencilMask;
// Creates a decoder.
static GLES2Decoder* Create(DecoderClient* client,
CommandBufferServiceBase* command_buffer_service,
Outputter* outputter,
ContextGroup* group);
~GLES2Decoder() override;
// DecoderContext implementation.
bool initialized() const override;
TextureBase* GetTextureBase(uint32_t client_id) override;
void SetLevelInfo(uint32_t client_id,
int level,
unsigned internal_format,
unsigned width,
unsigned height,
unsigned depth,
unsigned format,
unsigned type,
const gfx::Rect& cleared_rect) override;
void BeginDecoding() override;
void EndDecoding() override;
base::StringPiece GetLogPrefix() override;
void set_initialized() {
initialized_ = true;
bool debug() const {
return debug_;
// Set to true to call glGetError after every command.
void set_debug(bool debug) {
debug_ = debug;
bool log_commands() const {
return log_commands_;
// Set to true to LOG every command.
void SetLogCommands(bool log_commands) override;
Outputter* outputter() const override;
int GetRasterDecoderId() const override;
// Set the surface associated with the default FBO.
virtual void SetSurface(const scoped_refptr<gl::GLSurface>& surface) = 0;
// Releases the surface associated with the GL context.
// The decoder should not be used until a new surface is set.
virtual void ReleaseSurface() = 0;
virtual void TakeFrontBuffer(const Mailbox& mailbox) = 0;
virtual void ReturnFrontBuffer(const Mailbox& mailbox, bool is_lost) = 0;
// Resize an offscreen frame buffer.
virtual bool ResizeOffscreenFramebuffer(const gfx::Size& size) = 0;
// Gets the GLES2 Util which holds info.
virtual GLES2Util* GetGLES2Util() = 0;
// Restore States.
virtual void RestoreDeviceWindowRectangles() const = 0;
virtual void SetIgnoreCachedStateForTest(bool ignore) = 0;
virtual void SetForceShaderNameHashingForTest(bool force) = 0;
virtual uint32_t GetAndClearBackbufferClearBitsForTest();
virtual size_t GetSavedBackTextureCountForTest() = 0;
virtual size_t GetCreatedBackTextureCountForTest() = 0;
// Gets the FramebufferManager for this context.
virtual FramebufferManager* GetFramebufferManager() = 0;
// Gets the TransformFeedbackManager for this context.
virtual TransformFeedbackManager* GetTransformFeedbackManager() = 0;
// Gets the VertexArrayManager for this context.
virtual VertexArrayManager* GetVertexArrayManager() = 0;
// Gets the ImageManager for this context.
virtual ImageManager* GetImageManagerForTest() = 0;
// Get the service texture ID corresponding to a client texture ID.
// If no such record is found then return false.
virtual bool GetServiceTextureId(uint32_t client_texture_id,
uint32_t* service_texture_id);
virtual void WaitForReadPixels(base::OnceClosure callback) = 0;
virtual Logger* GetLogger() = 0;
virtual scoped_refptr<ShaderTranslatorInterface> GetTranslator(
unsigned int type) = 0;
virtual void SetCopyTextureResourceManagerForTest(
CopyTextureCHROMIUMResourceManager* copy_texture_resource_manager) = 0;
virtual void SetCopyTexImageBlitterForTest(
CopyTexImageResourceManager* copy_tex_image_blit) = 0;
GLES2Decoder(CommandBufferServiceBase* command_buffer_service,
Outputter* outputter);
bool initialized_ = false;
bool debug_ = false;
bool log_commands_ = false;
Outputter* outputter_ = nullptr;
} // namespace gles2
} // namespace gpu