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// Copyright 2017 The Dawn Authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#include "utils/TerribleCommandBuffer.h"
#include "common/Assert.h"
namespace utils {
TerribleCommandBuffer::TerribleCommandBuffer() {
}
TerribleCommandBuffer::TerribleCommandBuffer(dawn_wire::CommandHandler* handler)
: mHandler(handler) {
}
void TerribleCommandBuffer::SetHandler(dawn_wire::CommandHandler* handler) {
mHandler = handler;
}
size_t TerribleCommandBuffer::GetMaximumAllocationSize() const {
return sizeof(mBuffer);
}
void* TerribleCommandBuffer::GetCmdSpace(size_t size) {
// TODO(kainino@chromium.org): Should we early-out if size is 0?
// (Here and/or in the caller?) It might be good to make the wire receiver get a nullptr
// instead of pointer to zero-sized allocation in mBuffer.
if (size > sizeof(mBuffer)) {
return nullptr;
}
char* result = &mBuffer[mOffset];
if (sizeof(mBuffer) - size < mOffset) {
if (!Flush()) {
return nullptr;
}
return GetCmdSpace(size);
}
mOffset += size;
return result;
}
bool TerribleCommandBuffer::Flush() {
bool success = mHandler->HandleCommands(mBuffer, mOffset) != nullptr;
mOffset = 0;
return success;
}
} // namespace utils