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// Copyright (c) 2006-2008 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 "o3d/gpu_plugin/command_buffer.h"
namespace o3d {
namespace gpu_plugin {
CommandBuffer::CommandBuffer(NPP npp)
: npp_(npp),
size_(0),
get_offset_(0),
put_offset_(0),
token_(0),
parse_error_(0),
error_status_(false) {
// Element zero is always NULL.
registered_objects_.push_back(NPObjectPointer<NPObject>());
}
CommandBuffer::~CommandBuffer() {
}
bool CommandBuffer::Initialize(NPObjectPointer<NPObject> ring_buffer) {
// Fail if already initialized.
if (ring_buffer_.Get())
return false;
if (!ring_buffer.Get())
return false;
int32 size_in_bytes;
if (!NPInvoke(npp_, ring_buffer, "getSize", &size_in_bytes))
return false;
if (size_in_bytes < 0)
return false;
size_ = size_in_bytes / sizeof(int32);
ring_buffer_ = ring_buffer;
return true;
}
NPObjectPointer<NPObject> CommandBuffer::GetRingBuffer() {
return ring_buffer_;
}
int32 CommandBuffer::GetSize() {
return size_;
}
int32 CommandBuffer::SyncOffsets(int32 put_offset) {
if (put_offset < 0 || put_offset >= size_)
return -1;
put_offset_ = put_offset;
if (put_offset_change_callback_.get()) {
put_offset_change_callback_->Run();
}
return get_offset_;
}
int32 CommandBuffer::GetGetOffset() {
return get_offset_;
}
void CommandBuffer::SetGetOffset(int32 get_offset) {
DCHECK(get_offset >= 0 && get_offset < size_);
get_offset_ = get_offset;
}
int32 CommandBuffer::GetPutOffset() {
return put_offset_;
}
void CommandBuffer::SetPutOffsetChangeCallback(Callback0::Type* callback) {
put_offset_change_callback_.reset(callback);
}
int32 CommandBuffer::RegisterObject(NPObjectPointer<NPObject> object) {
if (!object.Get())
return 0;
if (unused_registered_object_elements_.empty()) {
// Check we haven't exceeded the range that fits in a 32-bit integer.
int32 handle = static_cast<int32>(registered_objects_.size());
if (handle != registered_objects_.size())
return -1;
registered_objects_.push_back(object);
return handle;
}
int32 handle = *unused_registered_object_elements_.begin();
unused_registered_object_elements_.erase(
unused_registered_object_elements_.begin());
DCHECK(!registered_objects_[handle].Get());
registered_objects_[handle] = object;
return handle;
}
void CommandBuffer::UnregisterObject(NPObjectPointer<NPObject> object,
int32 handle) {
if (handle <= 0)
return;
if (static_cast<size_t>(handle) >= registered_objects_.size())
return;
if (registered_objects_[handle] != object)
return;
registered_objects_[handle] = NPObjectPointer<NPObject>();
unused_registered_object_elements_.insert(handle);
// Remove all null objects from the end of the vector. This allows the vector
// to shrink when, for example, all objects are unregistered. Note that this
// loop never removes element zero, which is always NULL.
while (registered_objects_.size() > 1 && !registered_objects_.back().Get()) {
registered_objects_.pop_back();
unused_registered_object_elements_.erase(
static_cast<int32>(registered_objects_.size()));
}
}
NPObjectPointer<NPObject> CommandBuffer::GetRegisteredObject(int32 handle) {
if (handle < 0)
return NPObjectPointer<NPObject>();
if (static_cast<size_t>(handle) >= registered_objects_.size())
return NPObjectPointer<NPObject>();
return registered_objects_[handle];
}
int32 CommandBuffer::ResetParseError() {
int32 last_error = parse_error_;
parse_error_ = 0;
return last_error;
}
void CommandBuffer::SetParseError(int32 parse_error) {
if (parse_error_ == 0) {
parse_error_ = parse_error;
}
}
} // namespace gpu_plugin
} // namespace o3d
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