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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.
#include "gpu/command_buffer/service/program_cache.h"
#include <string>
#include "base/memory/scoped_ptr.h"
#include "gpu/command_buffer/service/shader_manager.h"
namespace gpu {
namespace gles2 {
ProgramCache::ProgramCache() {}
ProgramCache::~ProgramCache() {}
void ProgramCache::Clear() {
ClearBackend();
link_status_.clear();
}
ProgramCache::LinkedProgramStatus ProgramCache::GetLinkedProgramStatus(
const std::string& shader_signature_a,
const std::string& shader_signature_b,
const std::map<std::string, GLint>* bind_attrib_location_map) const {
char a_sha[kHashLength];
char b_sha[kHashLength];
ComputeShaderHash(shader_signature_a, a_sha);
ComputeShaderHash(shader_signature_b, b_sha);
char sha[kHashLength];
ComputeProgramHash(a_sha,
b_sha,
bind_attrib_location_map,
sha);
const std::string sha_string(sha, kHashLength);
LinkStatusMap::const_iterator found = link_status_.find(sha_string);
if (found == link_status_.end()) {
return ProgramCache::LINK_UNKNOWN;
} else {
return found->second;
}
}
void ProgramCache::LinkedProgramCacheSuccess(
const std::string& shader_signature_a,
const std::string& shader_signature_b,
const LocationMap* bind_attrib_location_map) {
char a_sha[kHashLength];
char b_sha[kHashLength];
ComputeShaderHash(shader_signature_a, a_sha);
ComputeShaderHash(shader_signature_b, b_sha);
char sha[kHashLength];
ComputeProgramHash(a_sha,
b_sha,
bind_attrib_location_map,
sha);
const std::string sha_string(sha, kHashLength);
LinkedProgramCacheSuccess(sha_string);
}
void ProgramCache::LinkedProgramCacheSuccess(const std::string& program_hash) {
link_status_[program_hash] = LINK_SUCCEEDED;
}
void ProgramCache::ComputeShaderHash(
const std::string& str,
char* result) const {
base::SHA1HashBytes(reinterpret_cast<const unsigned char*>(str.c_str()),
str.length(), reinterpret_cast<unsigned char*>(result));
}
void ProgramCache::Evict(const std::string& program_hash) {
link_status_.erase(program_hash);
}
namespace {
size_t CalculateMapSize(const std::map<std::string, GLint>* map) {
if (!map) {
return 0;
}
std::map<std::string, GLint>::const_iterator it;
size_t total = 0;
for (it = map->begin(); it != map->end(); ++it) {
total += 4 + it->first.length();
}
return total;
}
} // anonymous namespace
void ProgramCache::ComputeProgramHash(
const char* hashed_shader_0,
const char* hashed_shader_1,
const std::map<std::string, GLint>* bind_attrib_location_map,
char* result) const {
const size_t shader0_size = kHashLength;
const size_t shader1_size = kHashLength;
const size_t map_size = CalculateMapSize(bind_attrib_location_map);
const size_t total_size = shader0_size + shader1_size + map_size;
scoped_ptr<unsigned char[]> buffer(new unsigned char[total_size]);
memcpy(buffer.get(), hashed_shader_0, shader0_size);
memcpy(&buffer[shader0_size], hashed_shader_1, shader1_size);
if (map_size != 0) {
// copy our map
size_t current_pos = shader0_size + shader1_size;
std::map<std::string, GLint>::const_iterator it;
for (it = bind_attrib_location_map->begin();
it != bind_attrib_location_map->end();
++it) {
const size_t name_size = it->first.length();
memcpy(&buffer.get()[current_pos], it->first.c_str(), name_size);
current_pos += name_size;
const GLint value = it->second;
buffer[current_pos++] = value >> 24;
buffer[current_pos++] = static_cast<unsigned char>(value >> 16);
buffer[current_pos++] = static_cast<unsigned char>(value >> 8);
buffer[current_pos++] = static_cast<unsigned char>(value);
}
}
base::SHA1HashBytes(buffer.get(),
total_size, reinterpret_cast<unsigned char*>(result));
}
} // namespace gles2
} // namespace gpu
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