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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_BINDGROUP_H_
#define DAWNNATIVE_BINDGROUP_H_
#include "common/Constants.h"
#include "common/Math.h"
#include "dawn_native/BindGroupLayout.h"
#include "dawn_native/Error.h"
#include "dawn_native/Forward.h"
#include "dawn_native/ObjectBase.h"
#include "dawn_native/dawn_platform.h"
#include <array>
namespace dawn_native {
class DeviceBase;
MaybeError ValidateBindGroupDescriptor(DeviceBase* device,
const BindGroupDescriptor* descriptor);
struct BufferBinding {
BufferBase* buffer;
uint64_t offset;
uint64_t size;
};
class BindGroupBase : public ObjectBase {
public:
~BindGroupBase() override;
static BindGroupBase* MakeError(DeviceBase* device);
BindGroupLayoutBase* GetLayout();
BufferBinding GetBindingAsBufferBinding(BindingIndex bindingIndex);
SamplerBase* GetBindingAsSampler(BindingIndex bindingIndex);
TextureViewBase* GetBindingAsTextureView(BindingIndex bindingIndex);
protected:
// To save memory, the size of a bind group is dynamically determined and the bind group is
// placement-allocated into memory big enough to hold the bind group with its
// dynamically-sized bindings after it. The pointer of the memory of the beginning of the
// binding data should be passed as |bindingDataStart|.
BindGroupBase(DeviceBase* device,
const BindGroupDescriptor* descriptor,
void* bindingDataStart);
// Helper to instantiate BindGroupBase. We pass in |derived| because BindGroupBase may not
// be first in the allocation. The binding data is stored after the Derived class.
template <typename Derived>
BindGroupBase(Derived* derived, DeviceBase* device, const BindGroupDescriptor* descriptor)
: BindGroupBase(device,
descriptor,
AlignPtr(reinterpret_cast<char*>(derived) + sizeof(Derived),
descriptor->layout->GetBindingDataAlignment())) {
static_assert(std::is_base_of<BindGroupBase, Derived>::value, "");
}
private:
BindGroupBase(DeviceBase* device, ObjectBase::ErrorTag tag);
Ref<BindGroupLayoutBase> mLayout;
BindGroupLayoutBase::BindingDataPointers mBindingData;
};
} // namespace dawn_native
#endif // DAWNNATIVE_BINDGROUP_H_
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