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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.
#ifndef GPU_COMMAND_BUFFER_SERVICE_PROGRAM_CACHE_H_
#define GPU_COMMAND_BUFFER_SERVICE_PROGRAM_CACHE_H_
#include <map>
#include <string>
#include "base/containers/hash_tables.h"
#include "base/sha1.h"
#include "gpu/command_buffer/common/gles2_cmd_format.h"
#include "gpu/command_buffer/service/gles2_cmd_decoder.h"
#include "gpu/command_buffer/service/shader_manager.h"
namespace gpu {
namespace gles2 {
class Shader;
// Program cache base class for caching linked gpu programs
class GPU_EXPORT ProgramCache {
public:
static const size_t kHashLength = base::kSHA1Length;
typedef std::map<std::string, GLint> LocationMap;
enum LinkedProgramStatus {
LINK_UNKNOWN,
LINK_SUCCEEDED
};
enum ProgramLoadResult {
PROGRAM_LOAD_FAILURE,
PROGRAM_LOAD_SUCCESS
};
ProgramCache();
virtual ~ProgramCache();
LinkedProgramStatus GetLinkedProgramStatus(
const std::string& shader_signature_a,
const std::string& shader_signature_b,
const LocationMap* bind_attrib_location_map) const;
// Loads the linked program from the cache. If the program is not found or
// there was an error, PROGRAM_LOAD_FAILURE should be returned.
virtual ProgramLoadResult LoadLinkedProgram(
GLuint program,
Shader* shader_a,
Shader* shader_b,
const LocationMap* bind_attrib_location_map,
const ShaderCacheCallback& shader_callback) = 0;
// Saves the program into the cache. If successful, the implementation should
// call LinkedProgramCacheSuccess.
virtual void SaveLinkedProgram(
GLuint program,
const Shader* shader_a,
const Shader* shader_b,
const LocationMap* bind_attrib_location_map,
const ShaderCacheCallback& shader_callback) = 0;
virtual void LoadProgram(const std::string& program) = 0;
// clears the cache
void Clear();
// Only for testing
void LinkedProgramCacheSuccess(const std::string& shader_signature_a,
const std::string& shader_signature_b,
const LocationMap* bind_attrib_location_map);
protected:
// called by implementing class after a shader was successfully cached
void LinkedProgramCacheSuccess(const std::string& program_hash);
// result is not null terminated
void ComputeShaderHash(const std::string& shader,
char* result) const;
// result is not null terminated. hashed shaders are expected to be
// kHashLength in length
void ComputeProgramHash(
const char* hashed_shader_0,
const char* hashed_shader_1,
const LocationMap* bind_attrib_location_map,
char* result) const;
void Evict(const std::string& program_hash);
private:
typedef base::hash_map<std::string,
LinkedProgramStatus> LinkStatusMap;
// called to clear the backend cache
virtual void ClearBackend() = 0;
LinkStatusMap link_status_;
DISALLOW_COPY_AND_ASSIGN(ProgramCache);
};
} // namespace gles2
} // namespace gpu
#endif // GPU_COMMAND_BUFFER_SERVICE_PROGRAM_CACHE_H_
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