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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/SamplerD3D12.h"
#include "dawn_native/d3d12/DeviceD3D12.h"
#include "dawn_native/d3d12/UtilsD3D12.h"
namespace dawn_native { namespace d3d12 {
namespace {
D3D12_TEXTURE_ADDRESS_MODE AddressMode(wgpu::AddressMode mode) {
switch (mode) {
case wgpu::AddressMode::Repeat:
return D3D12_TEXTURE_ADDRESS_MODE_WRAP;
case wgpu::AddressMode::MirrorRepeat:
return D3D12_TEXTURE_ADDRESS_MODE_MIRROR;
case wgpu::AddressMode::ClampToEdge:
return D3D12_TEXTURE_ADDRESS_MODE_CLAMP;
}
}
} // namespace
// static
Ref<Sampler> Sampler::Create(Device* device, const SamplerDescriptor* descriptor) {
return AcquireRef(new Sampler(device, descriptor));
}
Sampler::Sampler(Device* device, const SamplerDescriptor* descriptor)
: SamplerBase(device, descriptor) {
D3D12_FILTER_TYPE minFilter;
switch (descriptor->minFilter) {
case wgpu::FilterMode::Nearest:
minFilter = D3D12_FILTER_TYPE_POINT;
break;
case wgpu::FilterMode::Linear:
minFilter = D3D12_FILTER_TYPE_LINEAR;
break;
}
D3D12_FILTER_TYPE magFilter;
switch (descriptor->magFilter) {
case wgpu::FilterMode::Nearest:
magFilter = D3D12_FILTER_TYPE_POINT;
break;
case wgpu::FilterMode::Linear:
magFilter = D3D12_FILTER_TYPE_LINEAR;
break;
}
D3D12_FILTER_TYPE mipmapFilter;
switch (descriptor->mipmapFilter) {
case wgpu::FilterMode::Nearest:
mipmapFilter = D3D12_FILTER_TYPE_POINT;
break;
case wgpu::FilterMode::Linear:
mipmapFilter = D3D12_FILTER_TYPE_LINEAR;
break;
}
D3D12_FILTER_REDUCTION_TYPE reduction =
descriptor->compare == wgpu::CompareFunction::Undefined
? D3D12_FILTER_REDUCTION_TYPE_STANDARD
: D3D12_FILTER_REDUCTION_TYPE_COMPARISON;
// https://docs.microsoft.com/en-us/windows/win32/api/d3d12/ns-d3d12-d3d12_sampler_desc
mSamplerDesc.MaxAnisotropy = std::min<uint16_t>(GetMaxAnisotropy(), 16u);
if (mSamplerDesc.MaxAnisotropy > 1) {
mSamplerDesc.Filter = D3D12_ENCODE_ANISOTROPIC_FILTER(reduction);
} else {
mSamplerDesc.Filter =
D3D12_ENCODE_BASIC_FILTER(minFilter, magFilter, mipmapFilter, reduction);
}
mSamplerDesc.AddressU = AddressMode(descriptor->addressModeU);
mSamplerDesc.AddressV = AddressMode(descriptor->addressModeV);
mSamplerDesc.AddressW = AddressMode(descriptor->addressModeW);
mSamplerDesc.MipLODBias = 0.f;
if (descriptor->compare != wgpu::CompareFunction::Undefined) {
mSamplerDesc.ComparisonFunc = ToD3D12ComparisonFunc(descriptor->compare);
} else {
// Still set the function so it's not garbage.
mSamplerDesc.ComparisonFunc = D3D12_COMPARISON_FUNC_NEVER;
}
mSamplerDesc.MinLOD = descriptor->lodMinClamp;
mSamplerDesc.MaxLOD = descriptor->lodMaxClamp;
}
const D3D12_SAMPLER_DESC& Sampler::GetSamplerDescriptor() const {
return mSamplerDesc;
}
}} // namespace dawn_native::d3d12