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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 "dawn_native/d3d12/BindGroupLayoutD3D12.h"
#include "common/BitSetIterator.h"
#include "dawn_native/d3d12/BindGroupD3D12.h"
#include "dawn_native/d3d12/DeviceD3D12.h"
namespace dawn_native { namespace d3d12 {
namespace {
BindGroupLayout::DescriptorType WGPUBindingTypeToDescriptorType(
wgpu::BindingType bindingType) {
switch (bindingType) {
case wgpu::BindingType::UniformBuffer:
return BindGroupLayout::DescriptorType::CBV;
case wgpu::BindingType::StorageBuffer:
case wgpu::BindingType::WriteonlyStorageTexture:
return BindGroupLayout::DescriptorType::UAV;
case wgpu::BindingType::SampledTexture:
case wgpu::BindingType::ReadonlyStorageBuffer:
case wgpu::BindingType::ReadonlyStorageTexture:
return BindGroupLayout::DescriptorType::SRV;
case wgpu::BindingType::Sampler:
return BindGroupLayout::DescriptorType::Sampler;
case wgpu::BindingType::StorageTexture:
UNREACHABLE();
return BindGroupLayout::DescriptorType::UAV;
}
}
} // anonymous namespace
BindGroupLayout::BindGroupLayout(Device* device, const BindGroupLayoutDescriptor* descriptor)
: BindGroupLayoutBase(device, descriptor),
mDescriptorCounts{},
mBindGroupAllocator(MakeFrontendBindGroupAllocator<BindGroup>(4096)) {
for (BindingIndex bindingIndex = GetDynamicBufferCount(); bindingIndex < GetBindingCount();
++bindingIndex) {
const BindingInfo& bindingInfo = GetBindingInfo(bindingIndex);
// For dynamic resources, Dawn uses root descriptor in D3D12 backend.
// So there is no need to allocate the descriptor from descriptor heap.
// This loop starts after the dynamic buffer indices to skip counting
// dynamic resources in calculating the size of the descriptor heap.
ASSERT(!bindingInfo.hasDynamicOffset);
DescriptorType descriptorType = WGPUBindingTypeToDescriptorType(bindingInfo.type);
mBindingOffsets[bindingIndex] = mDescriptorCounts[descriptorType]++;
}
auto SetDescriptorRange = [&](uint32_t index, uint32_t count, uint32_t* baseRegister,
D3D12_DESCRIPTOR_RANGE_TYPE type) -> bool {
if (count == 0) {
return false;
}
auto& range = mRanges[index];
range.RangeType = type;
range.NumDescriptors = count;
range.RegisterSpace = 0;
range.OffsetInDescriptorsFromTableStart = D3D12_DESCRIPTOR_RANGE_OFFSET_APPEND;
range.BaseShaderRegister = *baseRegister;
*baseRegister += count;
// These ranges will be copied and range.BaseShaderRegister will be set in
// d3d12::PipelineLayout to account for bind group register offsets
return true;
};
uint32_t rangeIndex = 0;
uint32_t baseRegister = 0;
std::array<uint32_t, DescriptorType::Count> descriptorOffsets;
// Ranges 0-2 contain the CBV, UAV, and SRV ranges, if they exist, tightly packed
// Range 3 contains the Sampler range, if there is one
if (SetDescriptorRange(rangeIndex, mDescriptorCounts[CBV], &baseRegister,
D3D12_DESCRIPTOR_RANGE_TYPE_CBV)) {
descriptorOffsets[CBV] = mRanges[rangeIndex++].BaseShaderRegister;
}
if (SetDescriptorRange(rangeIndex, mDescriptorCounts[UAV], &baseRegister,
D3D12_DESCRIPTOR_RANGE_TYPE_UAV)) {
descriptorOffsets[UAV] = mRanges[rangeIndex++].BaseShaderRegister;
}
if (SetDescriptorRange(rangeIndex, mDescriptorCounts[SRV], &baseRegister,
D3D12_DESCRIPTOR_RANGE_TYPE_SRV)) {
descriptorOffsets[SRV] = mRanges[rangeIndex++].BaseShaderRegister;
}
uint32_t zero = 0;
SetDescriptorRange(Sampler, mDescriptorCounts[Sampler], &zero,
D3D12_DESCRIPTOR_RANGE_TYPE_SAMPLER);
descriptorOffsets[Sampler] = 0;
for (BindingIndex bindingIndex = 0; bindingIndex < GetBindingCount(); ++bindingIndex) {
const BindingInfo& bindingInfo = GetBindingInfo(bindingIndex);
if (bindingInfo.hasDynamicOffset) {
// Dawn is using values in mBindingOffsets to decide register number in HLSL.
// Root descriptor needs to set this value to set correct register number in
// generated HLSL shader.
switch (bindingInfo.type) {
case wgpu::BindingType::UniformBuffer:
case wgpu::BindingType::StorageBuffer:
case wgpu::BindingType::ReadonlyStorageBuffer:
mBindingOffsets[bindingIndex] = baseRegister++;
break;
case wgpu::BindingType::SampledTexture:
case wgpu::BindingType::Sampler:
case wgpu::BindingType::StorageTexture:
case wgpu::BindingType::ReadonlyStorageTexture:
case wgpu::BindingType::WriteonlyStorageTexture:
UNREACHABLE();
break;
}
continue;
}
// TODO(shaobo.yan@intel.com): Implement dynamic buffer offset.
DescriptorType descriptorType = WGPUBindingTypeToDescriptorType(bindingInfo.type);
mBindingOffsets[bindingIndex] += descriptorOffsets[descriptorType];
}
}
BindGroup* BindGroupLayout::AllocateBindGroup(Device* device,
const BindGroupDescriptor* descriptor) {
return mBindGroupAllocator.Allocate(device, descriptor);
}
void BindGroupLayout::DeallocateBindGroup(BindGroup* bindGroup) {
mBindGroupAllocator.Deallocate(bindGroup);
}
const std::array<uint32_t, kMaxBindingsPerGroup>& BindGroupLayout::GetBindingOffsets() const {
return mBindingOffsets;
}
uint32_t BindGroupLayout::GetCbvUavSrvDescriptorTableSize() const {
return (static_cast<uint32_t>(mDescriptorCounts[CBV] > 0) +
static_cast<uint32_t>(mDescriptorCounts[UAV] > 0) +
static_cast<uint32_t>(mDescriptorCounts[SRV] > 0));
}
uint32_t BindGroupLayout::GetSamplerDescriptorTableSize() const {
return mDescriptorCounts[Sampler] > 0;
}
uint32_t BindGroupLayout::GetCbvUavSrvDescriptorCount() const {
return mDescriptorCounts[CBV] + mDescriptorCounts[UAV] + mDescriptorCounts[SRV];
}
uint32_t BindGroupLayout::GetSamplerDescriptorCount() const {
return mDescriptorCounts[Sampler];
}
const D3D12_DESCRIPTOR_RANGE* BindGroupLayout::GetCbvUavSrvDescriptorRanges() const {
return mRanges;
}
const D3D12_DESCRIPTOR_RANGE* BindGroupLayout::GetSamplerDescriptorRanges() const {
return &mRanges[Sampler];
}
}} // namespace dawn_native::d3d12
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