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// Copyright (c) 2010 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/buffer_manager.h"
#include "base/logging.h"
#include "gpu/command_buffer/common/gles2_cmd_utils.h"
#include "gpu/command_buffer/service/gles2_cmd_decoder.h"
namespace gpu {
namespace gles2 {
BufferManager::BufferManager()
: allow_buffers_on_multiple_targets_(false) {
}
BufferManager::~BufferManager() {
DCHECK(buffer_infos_.empty());
}
void BufferManager::Destroy(bool have_context) {
while (!buffer_infos_.empty()) {
if (have_context) {
BufferInfo* info = buffer_infos_.begin()->second;
if (!info->IsDeleted()) {
GLuint service_id = info->service_id();
glDeleteBuffersARB(1, &service_id);
info->MarkAsDeleted();
}
}
buffer_infos_.erase(buffer_infos_.begin());
}
}
void BufferManager::CreateBufferInfo(GLuint client_id, GLuint service_id) {
std::pair<BufferInfoMap::iterator, bool> result =
buffer_infos_.insert(
std::make_pair(client_id,
BufferInfo::Ref(new BufferInfo(service_id))));
DCHECK(result.second);
}
BufferManager::BufferInfo* BufferManager::GetBufferInfo(
GLuint client_id) {
BufferInfoMap::iterator it = buffer_infos_.find(client_id);
return it != buffer_infos_.end() ? it->second : NULL;
}
void BufferManager::RemoveBufferInfo(GLuint client_id) {
BufferInfoMap::iterator it = buffer_infos_.find(client_id);
if (it != buffer_infos_.end()) {
it->second->MarkAsDeleted();
buffer_infos_.erase(it);
}
}
BufferManager::BufferInfo::BufferInfo(GLuint service_id)
: service_id_(service_id),
target_(0),
size_(0),
shadowed_(false) {
}
BufferManager::BufferInfo::~BufferInfo() { }
void BufferManager::BufferInfo::SetSize(GLsizeiptr size, bool shadow) {
DCHECK(!IsDeleted());
if (size != size_ || shadow != shadowed_) {
shadowed_ = shadow;
size_ = size;
ClearCache();
if (shadowed_) {
shadow_.reset(new int8[size]);
memset(shadow_.get(), 0, size);
}
}
}
bool BufferManager::BufferInfo::SetRange(
GLintptr offset, GLsizeiptr size, const GLvoid * data) {
DCHECK(!IsDeleted());
if (offset + size < offset ||
offset + size > size_) {
return false;
}
if (shadowed_) {
memcpy(shadow_.get() + offset, data, size);
ClearCache();
}
return true;
}
void BufferManager::BufferInfo::ClearCache() {
range_set_.clear();
}
template <typename T>
GLuint GetMaxValue(const void* data, GLuint offset, GLsizei count) {
GLuint max_value = 0;
const T* element = reinterpret_cast<const T*>(
static_cast<const int8*>(data) + offset);
const T* end = element + count;
for (; element < end; ++element) {
if (*element > max_value) {
max_value = *element;
}
}
return max_value;
}
bool BufferManager::BufferInfo::GetMaxValueForRange(
GLuint offset, GLsizei count, GLenum type, GLuint* max_value) {
DCHECK(!IsDeleted());
Range range(offset, count, type);
RangeToMaxValueMap::iterator it = range_set_.find(range);
if (it != range_set_.end()) {
*max_value = it->second;
return true;
}
uint32 size;
if (!SafeMultiplyUint32(
count, GLES2Util::GetGLTypeSizeForTexturesAndBuffers(type), &size)) {
return false;
}
if (!SafeAddUint32(offset, size, &size)) {
return false;
}
if (size > static_cast<uint32>(size_)) {
return false;
}
if (!shadowed_) {
return false;
}
// Scan the range for the max value and store
GLuint max_v = 0;
switch (type) {
case GL_UNSIGNED_BYTE:
max_v = GetMaxValue<uint8>(shadow_.get(), offset, count);
break;
case GL_UNSIGNED_SHORT:
// Check we are not accessing an odd byte for a 2 byte value.
if ((offset & 1) != 0) {
return false;
}
max_v = GetMaxValue<uint16>(shadow_.get(), offset, count);
break;
case GL_UNSIGNED_INT:
// Check we are not accessing a non aligned address for a 4 byte value.
if ((offset & 3) != 0) {
return false;
}
max_v = GetMaxValue<uint32>(shadow_.get(), offset, count);
break;
default:
NOTREACHED(); // should never get here by validation.
break;
}
std::pair<RangeToMaxValueMap::iterator, bool> result =
range_set_.insert(std::make_pair(range, max_v));
*max_value = max_v;
return true;
}
bool BufferManager::GetClientId(GLuint service_id, GLuint* client_id) const {
// This doesn't need to be fast. It's only used during slow queries.
for (BufferInfoMap::const_iterator it = buffer_infos_.begin();
it != buffer_infos_.end(); ++it) {
if (it->second->service_id() == service_id) {
*client_id = it->first;
return true;
}
}
return false;
}
void BufferManager::SetSize(BufferManager::BufferInfo* info, GLsizeiptr size) {
DCHECK(info);
info->SetSize(size,
info->target() == GL_ELEMENT_ARRAY_BUFFER ||
allow_buffers_on_multiple_targets_);
}
bool BufferManager::SetTarget(BufferManager::BufferInfo* info, GLenum target) {
// Check that we are not trying to bind it to a different target.
if (info->target() != 0 && info->target() != target &&
!allow_buffers_on_multiple_targets_) {
return false;
}
if (info->target() == 0) {
info->set_target(target);
}
return true;
}
} // namespace gles2
} // namespace gpu
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