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cce6b01b6d
It is not supported on many mobile GPUS on Vulkan http://vulkan.gpuinfo.org/listreports.php?feature=dualSrcBlend&option=not and is optional on Metal
97 lines
4.6 KiB
Plaintext
97 lines
4.6 KiB
Plaintext
// Copyright 2017 The NXT Authors
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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#include "backend/metal/BlendStateMTL.h"
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#include "backend/metal/MetalBackend.h"
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namespace backend {
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namespace metal {
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namespace {
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MTLBlendFactor MetalBlendFactor(nxt::BlendFactor factor, bool alpha) {
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switch(factor) {
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case nxt::BlendFactor::Zero:
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return MTLBlendFactorZero;
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case nxt::BlendFactor::One:
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return MTLBlendFactorOne;
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case nxt::BlendFactor::SrcColor:
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return MTLBlendFactorSourceColor;
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case nxt::BlendFactor::OneMinusSrcColor:
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return MTLBlendFactorOneMinusSourceColor;
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case nxt::BlendFactor::SrcAlpha:
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return MTLBlendFactorSourceAlpha;
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case nxt::BlendFactor::OneMinusSrcAlpha:
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return MTLBlendFactorOneMinusSourceAlpha;
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case nxt::BlendFactor::DstColor:
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return MTLBlendFactorDestinationColor;
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case nxt::BlendFactor::OneMinusDstColor:
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return MTLBlendFactorOneMinusDestinationColor;
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case nxt::BlendFactor::DstAlpha:
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return MTLBlendFactorDestinationAlpha;
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case nxt::BlendFactor::OneMinusDstAlpha:
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return MTLBlendFactorOneMinusDestinationAlpha;
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case nxt::BlendFactor::SrcAlphaSaturated:
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return MTLBlendFactorSourceAlphaSaturated;
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case nxt::BlendFactor::BlendColor:
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return alpha ? MTLBlendFactorBlendAlpha : MTLBlendFactorBlendColor;
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case nxt::BlendFactor::OneMinusBlendColor:
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return alpha ? MTLBlendFactorOneMinusBlendAlpha : MTLBlendFactorOneMinusBlendColor;
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}
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}
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MTLBlendOperation MetalBlendOperation(nxt::BlendOperation operation) {
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switch(operation) {
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case nxt::BlendOperation::Add:
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return MTLBlendOperationAdd;
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case nxt::BlendOperation::Subtract:
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return MTLBlendOperationSubtract;
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case nxt::BlendOperation::ReverseSubtract:
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return MTLBlendOperationReverseSubtract;
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case nxt::BlendOperation::Min:
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return MTLBlendOperationMin;
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case nxt::BlendOperation::Max:
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return MTLBlendOperationMax;
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}
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}
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MTLColorWriteMask MetalColorWriteMask(nxt::ColorWriteMask colorWriteMask) {
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return (
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((colorWriteMask & nxt::ColorWriteMask::Red) != nxt::ColorWriteMask::None ? MTLColorWriteMaskRed : MTLColorWriteMaskNone) |
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((colorWriteMask & nxt::ColorWriteMask::Green) != nxt::ColorWriteMask::None ? MTLColorWriteMaskGreen : MTLColorWriteMaskNone) |
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((colorWriteMask & nxt::ColorWriteMask::Blue) != nxt::ColorWriteMask::None ? MTLColorWriteMaskBlue : MTLColorWriteMaskNone) |
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((colorWriteMask & nxt::ColorWriteMask::Alpha) != nxt::ColorWriteMask::None ? MTLColorWriteMaskAlpha : MTLColorWriteMaskNone)
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);
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}
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}
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BlendState::BlendState(BlendStateBuilder* builder) : BlendStateBase(builder) {
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}
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void BlendState::ApplyBlendState(MTLRenderPipelineColorAttachmentDescriptor* descriptor) const {
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auto& info = GetBlendInfo();
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descriptor.blendingEnabled = info.blendEnabled;
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descriptor.sourceRGBBlendFactor = MetalBlendFactor(info.colorBlend.srcFactor, false);
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descriptor.destinationRGBBlendFactor = MetalBlendFactor(info.colorBlend.dstFactor, false);
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descriptor.rgbBlendOperation = MetalBlendOperation(info.colorBlend.operation);
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descriptor.sourceAlphaBlendFactor = MetalBlendFactor(info.alphaBlend.srcFactor, true);
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descriptor.destinationAlphaBlendFactor = MetalBlendFactor(info.alphaBlend.dstFactor, true);
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descriptor.alphaBlendOperation = MetalBlendOperation(info.alphaBlend.operation);
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descriptor.writeMask = MetalColorWriteMask(info.colorWriteMask);
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}
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}
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}
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