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// Copyright 2019 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.
#ifndef DAWNNATIVE_ENCODINGCONTEXT_H_
#define DAWNNATIVE_ENCODINGCONTEXT_H_
#include "dawn_native/CommandAllocator.h"
#include "dawn_native/Error.h"
#include "dawn_native/ErrorData.h"
#include <string>
namespace dawn_native {
class ObjectBase;
class DeviceBase;
// Base class for allocating/iterating commands.
// It performs error tracking as well as encoding state for render/compute passes.
class EncodingContext {
public:
EncodingContext(DeviceBase* device, const ObjectBase* initialEncoder);
~EncodingContext();
CommandIterator AcquireCommands();
CommandIterator* GetIterator();
// Functions to handle encoder errors
void HandleError(const char* message);
inline void ConsumeError(ErrorData* error) {
HandleError(error->GetMessage().c_str());
delete error;
}
inline bool ConsumedError(MaybeError maybeError) {
if (DAWN_UNLIKELY(maybeError.IsError())) {
ConsumeError(maybeError.AcquireError());
return true;
}
return false;
}
template <typename EncodeFunction>
inline bool TryEncode(const void* encoder, EncodeFunction&& encodeFunction) {
if (DAWN_UNLIKELY(encoder != mCurrentEncoder)) {
if (mCurrentEncoder != mTopLevelEncoder) {
// The top level encoder was used when a pass encoder was current.
HandleError("Command cannot be recorded inside a pass");
} else {
HandleError("Recording in an error or already ended pass encoder");
}
return false;
}
ASSERT(!mWasMovedToIterator);
return !ConsumedError(encodeFunction(&mAllocator));
}
// Functions to set current encoder state
void EnterPass(const ObjectBase* passEncoder);
void ExitPass(const ObjectBase* passEncoder);
MaybeError Finish();
private:
bool IsFinished() const;
DeviceBase* mDevice;
// There can only be two levels of encoders. Top-level and render/compute pass.
// The top level encoder is the encoder the EncodingContext is created with.
// It doubles as flag to check if encoding has been Finished.
const ObjectBase* mTopLevelEncoder;
// The current encoder must be the same as the encoder provided to TryEncode,
// otherwise an error is produced. It may be nullptr if the EncodingContext is an error.
// The current encoder changes with Enter/ExitPass which should be called by
// CommandEncoder::Begin/EndPass.
const ObjectBase* mCurrentEncoder;
CommandAllocator mAllocator;
CommandIterator mIterator;
bool mWasMovedToIterator = false;
bool mWereCommandsAcquired = false;
bool mGotError = false;
std::string mErrorMessage;
};
} // namespace dawn_native
#endif // DAWNNATIVE_ENCODINGCONTEXT_H_
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