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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.
#include "gpu/command_buffer/service/program_cache.h"
#include <stddef.h>
#include <memory>
#include <string>
#include "base/containers/contains.h"
#include "base/containers/heap_array.h"
#include "base/containers/span_writer.h"
#include "base/hash/hash.h"
#include "base/metrics/histogram_macros.h"
#include "gpu/command_buffer/service/shader_manager.h"
#include "third_party/angle/src/common/angle_version_info.h"
namespace gpu {
namespace gles2 {
ProgramCache::ScopedCacheUse::ScopedCacheUse(ProgramCache* cache,
CacheProgramCallback callback)
: cache_(cache) {
base::AutoLock auto_lock(cache_->lock_);
// The existing callback should be null, otherwise we'll overwrite it.
DCHECK(!cache_->cache_program_callback_);
cache_->cache_program_callback_ = std::move(callback);
}
ProgramCache::ScopedCacheUse::~ScopedCacheUse() {
base::AutoLock auto_lock(cache_->lock_);
// The callback should be the one installed by the constructor. The DCHECK
// doesn't exactly check that, but checking for non-null is a cheap second.
DCHECK(cache_->cache_program_callback_);
cache_->cache_program_callback_.Reset();
}
ProgramCache::ProgramCache(size_t max_cache_size_bytes)
: max_size_bytes_(max_cache_size_bytes) {}
ProgramCache::~ProgramCache() = default;
void ProgramCache::Clear() {
ClearBackend();
link_status_.clear();
compiled_shaders_.clear();
}
bool ProgramCache::HasSuccessfullyCompiledShader(
const std::string& shader_signature) const {
Hash sha;
ComputeShaderHash(shader_signature, sha);
return base::Contains(compiled_shaders_, sha);
}
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 std::vector<std::string>& transform_feedback_varyings,
GLenum transform_feedback_buffer_mode) const {
Hash a_sha;
Hash b_sha;
ComputeShaderHash(shader_signature_a, a_sha);
ComputeShaderHash(shader_signature_b, b_sha);
Hash program_sha;
ComputeProgramHash(a_sha, b_sha, bind_attrib_location_map,
transform_feedback_varyings,
transform_feedback_buffer_mode, program_sha);
auto found_it = link_status_.find(program_sha);
if (found_it == link_status_.end()) {
return ProgramCache::LINK_UNKNOWN;
} else {
return found_it->second;
}
}
void ProgramCache::LinkedProgramCacheSuccess(
const std::string& shader_signature_a,
const std::string& shader_signature_b,
const LocationMap* bind_attrib_location_map,
const std::vector<std::string>& transform_feedback_varyings,
GLenum transform_feedback_buffer_mode) {
Hash a_sha;
Hash b_sha;
ComputeShaderHash(shader_signature_a, a_sha);
ComputeShaderHash(shader_signature_b, b_sha);
Hash program_sha;
ComputeProgramHash(a_sha, b_sha, bind_attrib_location_map,
transform_feedback_varyings,
transform_feedback_buffer_mode, program_sha);
CompiledShaderCacheSuccess(a_sha);
CompiledShaderCacheSuccess(b_sha);
LinkedProgramCacheSuccess(program_sha);
}
void ProgramCache::LinkedProgramCacheSuccess(const Hash& program_hash) {
link_status_[program_hash] = LINK_SUCCEEDED;
}
void ProgramCache::CompiledShaderCacheSuccess(const Hash& shader_hash) {
compiled_shaders_.insert(shader_hash);
}
void ProgramCache::ComputeShaderHash(std::string_view str, Hash& result) const {
result = base::SHA1Hash(base::as_byte_span(str));
}
void ProgramCache::Evict(const Hash& program_hash,
const Hash& shader_0_hash,
const Hash& shader_1_hash) {
link_status_.erase(program_hash);
compiled_shaders_.erase(shader_0_hash);
compiled_shaders_.erase(shader_1_hash);
}
namespace {
size_t CalculateMapSize(const std::map<std::string, GLint>* map) {
if (!map) {
return 0;
}
size_t total = 0;
for (auto it = map->begin(); it != map->end(); ++it) {
total += 4 + it->first.length();
}
return total;
}
size_t CalculateVaryingsSize(const std::vector<std::string>& varyings) {
size_t total = 0;
for (auto& varying : varyings) {
total += 1 + varying.length();
}
return total;
}
} // anonymous namespace
void ProgramCache::ComputeProgramHash(
HashView hashed_shader_0,
HashView hashed_shader_1,
const std::map<std::string, GLint>* bind_attrib_location_map,
const std::vector<std::string>& transform_feedback_varyings,
GLenum transform_feedback_buffer_mode,
Hash& result) const {
const size_t shader0_size = hashed_shader_0.size();
const size_t shader1_size = hashed_shader_1.size();
const size_t angle_commit_size = angle::GetANGLECommitHashSize();
const size_t map_size = CalculateMapSize(bind_attrib_location_map);
const size_t var_size = CalculateVaryingsSize(transform_feedback_varyings);
const size_t total_size = shader0_size + shader1_size + angle_commit_size
+ map_size + var_size + sizeof(transform_feedback_buffer_mode);
auto buffer_storage = base::HeapArray<uint8_t>::Uninit(total_size);
auto buffer = base::SpanWriter(base::span(buffer_storage));
CHECK(buffer.Write(hashed_shader_0));
CHECK(buffer.Write(hashed_shader_1));
CHECK(buffer.Write(base::as_byte_span(
// SAFETY: angle::GetANGLECommitHashSize() gives the number of bytes
// pointed to by angle::GetANGLECommitHash().
UNSAFE_BUFFERS(
base::span(angle::GetANGLECommitHash(), angle_commit_size)))));
if (map_size != 0) {
// copy our map
for (auto it = bind_attrib_location_map->begin();
it != bind_attrib_location_map->end();
++it) {
CHECK(buffer.Write(base::as_byte_span(it->first)));
CHECK(buffer.WriteI32BigEndian(it->second));
}
}
if (var_size != 0) {
// copy transform feedback varyings
for (auto& varying : transform_feedback_varyings) {
CHECK(buffer.Write(base::as_byte_span(varying)));
CHECK(buffer.WriteU8LittleEndian(uint8_t{' '}));
}
}
CHECK(buffer.Write(base::byte_span_from_ref(transform_feedback_buffer_mode)));
CHECK_EQ(buffer.remaining(), 0u); // Verify the size was computed correctly.
result = base::SHA1Hash(buffer_storage);
}
void ProgramCache::HandleMemoryPressure(
base::MemoryPressureListener::MemoryPressureLevel memory_pressure_level) {
if (memory_pressure_level ==
base::MemoryPressureListener::MEMORY_PRESSURE_LEVEL_NONE) {
return;
}
// Set a low limit on cache size for MEMORY_PRESSURE_LEVEL_MODERATE.
size_t limit = max_size_bytes_ / 4;
if (memory_pressure_level ==
base::MemoryPressureListener::MEMORY_PRESSURE_LEVEL_CRITICAL) {
limit = 0;
}
Trim(limit);
}
size_t ProgramCache::HashHasher::operator()(const Hash& hash) const {
return base::FastHash(hash);
}
} // namespace gles2
} // namespace gpu
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