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// Copyright 2018 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifdef UNSAFE_BUFFERS_BUILD
// TODO(crbug.com/40285824): Remove this and convert code to safer constructs.
#pragma allow_unsafe_buffers
#endif
#include "gpu/command_buffer/client/readback_buffer_shadow_tracker.h"
#include "base/memory/ptr_util.h"
#include "build/build_config.h"
#include "gpu/command_buffer/client/gles2_cmd_helper.h"
#include "gpu/command_buffer/client/mapped_memory.h"
namespace gpu {
namespace gles2 {
// ReadbackBufferShadowTracker::Buffer
ReadbackBufferShadowTracker::Buffer::Buffer(GLuint buffer_id,
MappedMemoryManager* mapped_memory,
GLES2CmdHelper* helper)
: buffer_id_(buffer_id), mapped_memory_(mapped_memory), helper_(helper) {}
ReadbackBufferShadowTracker::Buffer::~Buffer() {
Free();
}
uint32_t ReadbackBufferShadowTracker::Buffer::Alloc(int32_t* shm_id,
uint32_t* shm_offset,
bool* already_allocated) {
*already_allocated = readback_shm_address_ != nullptr;
if (!readback_shm_address_) {
readback_shm_address_ =
mapped_memory_->Alloc(size_, &shm_id_, &shm_offset_);
}
*shm_id = shm_id_;
*shm_offset = shm_offset_;
return size_;
}
void ReadbackBufferShadowTracker::Buffer::Free() {
if (readback_shm_address_) {
mapped_memory_->FreePendingToken(readback_shm_address_,
helper_->InsertToken());
}
readback_shm_address_ = nullptr;
}
void* ReadbackBufferShadowTracker::Buffer::MapReadbackShm(uint32_t offset,
uint32_t map_size) {
DCHECK(!is_mapped_);
if (serial_of_readback_data_ != serial_of_last_write_) {
return nullptr;
}
if (!readback_shm_address_) {
return nullptr;
}
if (map_size > size_) {
return nullptr;
}
DCHECK_GE(size_, map_size);
if (offset > size_ - map_size) {
return nullptr;
}
is_mapped_ = true;
return &static_cast<uint8_t*>(readback_shm_address_)[offset];
}
bool ReadbackBufferShadowTracker::Buffer::UnmapReadbackShm() {
Free();
bool was_mapped = is_mapped_;
is_mapped_ = false;
return was_mapped;
}
void ReadbackBufferShadowTracker::Buffer::UpdateSerialTo(uint64_t serial) {
DCHECK_LT(serial_of_readback_data_, serial);
serial_of_readback_data_ = serial;
}
// ReadbackBufferShadowTracker
ReadbackBufferShadowTracker::ReadbackBufferShadowTracker(
MappedMemoryManager* mapped_memory,
GLES2CmdHelper* helper)
: mapped_memory_(mapped_memory), helper_(helper) {}
ReadbackBufferShadowTracker::~ReadbackBufferShadowTracker() {}
ReadbackBufferShadowTracker::Buffer*
ReadbackBufferShadowTracker::GetOrCreateBuffer(GLuint id, GLuint size) {
Buffer* buffer = GetBuffer(id);
if (buffer) {
buffer->Free();
} else {
buffer = new Buffer(id, mapped_memory_, helper_);
buffers_.emplace(id, base::WrapUnique(buffer));
}
buffer->size_ = size;
OnBufferWrite(id);
return buffer;
}
void ReadbackBufferShadowTracker::OnBufferWrite(GLuint id) {
Buffer* buffer = GetBuffer(id);
if (!buffer) {
// Buffer is not tracked by the ReadbackBufferShadowTracker.
return;
}
DCHECK(buffer->serial_of_last_write_ <= buffer_shadow_serial_);
buffer->serial_of_last_write_ = buffer_shadow_serial_;
for (const auto& b : buffers_written_but_not_fenced_) {
if (b.get() == buffer) {
return;
}
}
buffers_written_but_not_fenced_.push_back(buffer->AsWeakPtr());
}
ReadbackBufferShadowTracker::BufferList
ReadbackBufferShadowTracker::TakeUnfencedBufferList() {
BufferList buffers;
std::swap(buffers, buffers_written_but_not_fenced_);
return buffers;
}
} // namespace gles2
} // namespace gpu
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