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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.
#ifndef DAWNNATIVE_PERSTAGE_H_
#define DAWNNATIVE_PERSTAGE_H_
#include "common/Assert.h"
#include "common/BitSetIterator.h"
#include "common/Constants.h"
#include "dawn_native/dawn_platform.h"
#include <array>
namespace dawn_native {
enum class SingleShaderStage { Vertex, Fragment, Compute };
static_assert(static_cast<uint32_t>(SingleShaderStage::Vertex) < kNumStages, "");
static_assert(static_cast<uint32_t>(SingleShaderStage::Fragment) < kNumStages, "");
static_assert(static_cast<uint32_t>(SingleShaderStage::Compute) < kNumStages, "");
static_assert(static_cast<uint32_t>(wgpu::ShaderStage::Vertex) ==
(1 << static_cast<uint32_t>(SingleShaderStage::Vertex)),
"");
static_assert(static_cast<uint32_t>(wgpu::ShaderStage::Fragment) ==
(1 << static_cast<uint32_t>(SingleShaderStage::Fragment)),
"");
static_assert(static_cast<uint32_t>(wgpu::ShaderStage::Compute) ==
(1 << static_cast<uint32_t>(SingleShaderStage::Compute)),
"");
BitSetIterator<kNumStages, SingleShaderStage> IterateStages(wgpu::ShaderStage stages);
wgpu::ShaderStage StageBit(SingleShaderStage stage);
static constexpr wgpu::ShaderStage kAllStages =
static_cast<wgpu::ShaderStage>((1 << kNumStages) - 1);
template <typename T>
class PerStage {
public:
PerStage() = default;
PerStage(const T& initialValue) {
mData.fill(initialValue);
}
T& operator[](SingleShaderStage stage) {
DAWN_ASSERT(static_cast<uint32_t>(stage) < kNumStages);
return mData[static_cast<uint32_t>(stage)];
}
const T& operator[](SingleShaderStage stage) const {
DAWN_ASSERT(static_cast<uint32_t>(stage) < kNumStages);
return mData[static_cast<uint32_t>(stage)];
}
T& operator[](wgpu::ShaderStage stageBit) {
uint32_t bit = static_cast<uint32_t>(stageBit);
DAWN_ASSERT(bit != 0 && IsPowerOfTwo(bit) && bit <= (1 << kNumStages));
return mData[Log2(bit)];
}
const T& operator[](wgpu::ShaderStage stageBit) const {
uint32_t bit = static_cast<uint32_t>(stageBit);
DAWN_ASSERT(bit != 0 && IsPowerOfTwo(bit) && bit <= (1 << kNumStages));
return mData[Log2(bit)];
}
private:
std::array<T, kNumStages> mData;
};
} // namespace dawn_native
#endif // DAWNNATIVE_PERSTAGE_H_