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// Copyright (c) 2009 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_CLIENT_GLES2_IMPLEMENTATION_H_
#define GPU_COMMAND_BUFFER_CLIENT_GLES2_IMPLEMENTATION_H_
#include "base/shared_memory.h"
#include "gpu/command_buffer/common/gles2_cmd_utils.h"
#include "gpu/command_buffer/client/gles2_cmd_helper.h"
#include "gpu/command_buffer/client/id_allocator.h"
#include "gpu/command_buffer/client/fenced_allocator.h"
namespace gpu {
namespace gles2 {
// This class emulates GLES2 over command buffers. It can be used by a client
// program so that the program does not need deal with shared memory and command
// buffer management. See gl2_lib.h. Note that there is a performance gain to
// be had by changing your code to use command buffers directly by using the
// GLES2CmdHelper but that entails changing your code to use and deal with
// shared memory and synchronization issues.
class GLES2Implementation {
public:
GLES2Implementation(
GLES2CmdHelper* helper,
size_t transfer_buffer_size,
void* transfer_buffer,
int32 transfer_buffer_id);
// The GLES2CmdHelper being used by this GLES2Implementation. You can use
// this to issue cmds at a lower level for certain kinds of optimization.
GLES2CmdHelper* helper() const {
return helper_;
}
// Include the auto-generated part of this class. We split this because
// it means we can easily edit the non-auto generated parts right here in
// this file instead of having to edit some template or the code generator.
#include "gpu/command_buffer/client/gles2_implementation_autogen.h"
private:
// Makes a set of Ids for glGen___ functions.
void MakeIds(GLsizei n, GLuint* ids);
// Frees a set of Ids for glDelete___ functions.
void FreeIds(GLsizei n, const GLuint* ids);
// Gets the shared memory id for the result buffer.
uint32 result_shm_id() const {
return transfer_buffer_id_;
}
// Gets the shared memory offset for the result buffer.
uint32 result_shm_offset() const {
return result_shm_offset_;
}
// Gets the value of the result.
template <typename T>
T GetResultAs() const {
return *static_cast<T*>(result_buffer_);
}
// Waits for all commands to execute.
void WaitForCmd();
// The maxiumum result size from simple GL get commands.
static const size_t kMaxSizeOfSimpleResult = 4 * sizeof(uint32); // NOLINT.
GLES2Util util_;
GLES2CmdHelper* helper_;
IdAllocator id_allocator_;
FencedAllocatorWrapper transfer_buffer_;
int transfer_buffer_id_;
void* result_buffer_;
uint32 result_shm_offset_;
// pack alignment as last set by glPixelStorei
GLint pack_alignment_;
// unpack alignment as last set by glPixelStorei
GLint unpack_alignment_;
DISALLOW_COPY_AND_ASSIGN(GLES2Implementation);
};
} // namespace gles2
} // namespace gpu
#endif // GPU_COMMAND_BUFFER_CLIENT_GLES2_IMPLEMENTATION_H_
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