src/backend/d3d12/BindGroupD3D12.cpp

// Copyright 2017 The NXT 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 "common/BitSetIterator.h"
#include "backend/d3d12/BindGroupD3D12.h"
#include "backend/d3d12/BindGroupLayoutD3D12.h"
#include "backend/d3d12/BufferD3D12.h"
#include "backend/d3d12/SamplerD3D12.h"
#include "backend/d3d12/TextureD3D12.h"

#include "backend/d3d12/D3D12Backend.h"

namespace backend {
namespace d3d12 {

    BindGroup::BindGroup(Device* device, BindGroupBuilder* builder)
        : BindGroupBase(builder), device(device) {
    }

    void BindGroup::RecordDescriptors(const DescriptorHeapHandle &cbvUavSrvHeapStart, uint32_t* cbvUavSrvHeapOffset, const DescriptorHeapHandle &samplerHeapStart, uint32_t* samplerHeapOffset, uint64_t serial) {
        heapSerial = serial;

        const auto* bgl = ToBackend(GetLayout());
        const auto& layout = bgl->GetBindingInfo();

        // Save the offset to the start of the descriptor table in the heap
        this->cbvUavSrvHeapOffset = *cbvUavSrvHeapOffset;
        this->samplerHeapOffset = *samplerHeapOffset;

        const auto& bindingOffsets = bgl->GetBindingOffsets();

        auto d3d12Device = device->GetD3D12Device();
        for (uint32_t binding : IterateBitSet(layout.mask)) {
            switch (layout.types[binding]) {
                case nxt::BindingType::UniformBuffer:
                    {
                        auto* view = ToBackend(GetBindingAsBufferView(binding));
                        auto& cbv = view->GetCBVDescriptor();
                        d3d12Device->CreateConstantBufferView(&cbv, cbvUavSrvHeapStart.GetCPUHandle(*cbvUavSrvHeapOffset + bindingOffsets[binding]));
                    }
                    break;
                case nxt::BindingType::StorageBuffer:
                    {
                        auto* view = ToBackend(GetBindingAsBufferView(binding));
                        auto& uav = view->GetUAVDescriptor();
                        d3d12Device->CreateUnorderedAccessView(ToBackend(view->GetBuffer())->GetD3D12Resource().Get(), nullptr, &uav, cbvUavSrvHeapStart.GetCPUHandle(*cbvUavSrvHeapOffset + bindingOffsets[binding]));
                    }
                    break;
                case nxt::BindingType::SampledTexture:
                    {
                        auto* view = ToBackend(GetBindingAsTextureView(binding));
                        auto& srv = view->GetSRVDescriptor();
                        d3d12Device->CreateShaderResourceView(ToBackend(view->GetTexture())->GetD3D12Resource().Get(), &srv, cbvUavSrvHeapStart.GetCPUHandle(*cbvUavSrvHeapOffset + bindingOffsets[binding]));
                    }
                    break;
                case nxt::BindingType::Sampler:
                    {
                        auto* sampler = ToBackend(GetBindingAsSampler(binding));
                        auto& samplerDesc = sampler->GetSamplerDescriptor();
                        d3d12Device->CreateSampler(&samplerDesc, samplerHeapStart.GetCPUHandle(*samplerHeapOffset + bindingOffsets[binding]));
                    }
                    break;
            }
        }

        // Offset by the number of descriptors created
        *cbvUavSrvHeapOffset += bgl->GetCbvUavSrvDescriptorCount();
        *samplerHeapOffset += bgl->GetSamplerDescriptorCount();
    }

    uint32_t BindGroup::GetCbvUavSrvHeapOffset() const {
        return cbvUavSrvHeapOffset;
    }

    uint32_t BindGroup::GetSamplerHeapOffset() const {
        return samplerHeapOffset;
    }

    uint64_t BindGroup::GetHeapSerial() const {
        return heapSerial;
    }

}
}