mirror of
https://github.com/ncblakely/GiantsTools
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445 lines
13 KiB
C++
445 lines
13 KiB
C++
//--------------------------------------------------------------------------------------
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// File: AlphaTestEffect.cpp
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//
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// Copyright (c) Microsoft Corporation. All rights reserved.
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// Licensed under the MIT License.
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//
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// http://go.microsoft.com/fwlink/?LinkId=248929
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//--------------------------------------------------------------------------------------
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#include "pch.h"
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#include "EffectCommon.h"
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using namespace DirectX;
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namespace
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{
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// Constant buffer layout. Must match the shader!
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struct AlphaTestEffectConstants
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{
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XMVECTOR diffuseColor;
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XMVECTOR alphaTest;
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XMVECTOR fogColor;
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XMVECTOR fogVector;
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XMMATRIX worldViewProj;
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};
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static_assert((sizeof(AlphaTestEffectConstants) % 16) == 0, "CB size not padded correctly");
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// Traits type describes our characteristics to the EffectBase template.
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struct AlphaTestEffectTraits
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{
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using ConstantBufferType = AlphaTestEffectConstants;
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static constexpr int VertexShaderCount = 4;
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static constexpr int PixelShaderCount = 4;
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static constexpr int ShaderPermutationCount = 8;
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};
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}
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// Internal AlphaTestEffect implementation class.
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class AlphaTestEffect::Impl : public EffectBase<AlphaTestEffectTraits>
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{
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public:
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Impl(_In_ ID3D11Device* device);
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D3D11_COMPARISON_FUNC alphaFunction;
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int referenceAlpha;
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bool vertexColorEnabled;
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EffectColor color;
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int GetCurrentShaderPermutation() const noexcept;
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void Apply(_In_ ID3D11DeviceContext* deviceContext);
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};
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// Include the precompiled shader code.
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namespace
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{
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#if defined(_XBOX_ONE) && defined(_TITLE)
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#include "Shaders/Compiled/XboxOneAlphaTestEffect_VSAlphaTest.inc"
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#include "Shaders/Compiled/XboxOneAlphaTestEffect_VSAlphaTestNoFog.inc"
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#include "Shaders/Compiled/XboxOneAlphaTestEffect_VSAlphaTestVc.inc"
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#include "Shaders/Compiled/XboxOneAlphaTestEffect_VSAlphaTestVcNoFog.inc"
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#include "Shaders/Compiled/XboxOneAlphaTestEffect_PSAlphaTestLtGt.inc"
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#include "Shaders/Compiled/XboxOneAlphaTestEffect_PSAlphaTestLtGtNoFog.inc"
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#include "Shaders/Compiled/XboxOneAlphaTestEffect_PSAlphaTestEqNe.inc"
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#include "Shaders/Compiled/XboxOneAlphaTestEffect_PSAlphaTestEqNeNoFog.inc"
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#else
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#include "Shaders/Compiled/AlphaTestEffect_VSAlphaTest.inc"
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#include "Shaders/Compiled/AlphaTestEffect_VSAlphaTestNoFog.inc"
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#include "Shaders/Compiled/AlphaTestEffect_VSAlphaTestVc.inc"
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#include "Shaders/Compiled/AlphaTestEffect_VSAlphaTestVcNoFog.inc"
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#include "Shaders/Compiled/AlphaTestEffect_PSAlphaTestLtGt.inc"
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#include "Shaders/Compiled/AlphaTestEffect_PSAlphaTestLtGtNoFog.inc"
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#include "Shaders/Compiled/AlphaTestEffect_PSAlphaTestEqNe.inc"
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#include "Shaders/Compiled/AlphaTestEffect_PSAlphaTestEqNeNoFog.inc"
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#endif
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}
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template<>
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const ShaderBytecode EffectBase<AlphaTestEffectTraits>::VertexShaderBytecode[] =
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{
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{ AlphaTestEffect_VSAlphaTest, sizeof(AlphaTestEffect_VSAlphaTest) },
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{ AlphaTestEffect_VSAlphaTestNoFog, sizeof(AlphaTestEffect_VSAlphaTestNoFog) },
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{ AlphaTestEffect_VSAlphaTestVc, sizeof(AlphaTestEffect_VSAlphaTestVc) },
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{ AlphaTestEffect_VSAlphaTestVcNoFog, sizeof(AlphaTestEffect_VSAlphaTestVcNoFog) },
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};
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template<>
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const int EffectBase<AlphaTestEffectTraits>::VertexShaderIndices[] =
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{
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0, // lt/gt
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1, // lt/gt, no fog
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2, // lt/gt, vertex color
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3, // lt/gt, vertex color, no fog
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0, // eq/ne
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1, // eq/ne, no fog
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2, // eq/ne, vertex color
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3, // eq/ne, vertex color, no fog
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};
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template<>
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const ShaderBytecode EffectBase<AlphaTestEffectTraits>::PixelShaderBytecode[] =
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{
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{ AlphaTestEffect_PSAlphaTestLtGt, sizeof(AlphaTestEffect_PSAlphaTestLtGt) },
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{ AlphaTestEffect_PSAlphaTestLtGtNoFog, sizeof(AlphaTestEffect_PSAlphaTestLtGtNoFog) },
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{ AlphaTestEffect_PSAlphaTestEqNe, sizeof(AlphaTestEffect_PSAlphaTestEqNe) },
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{ AlphaTestEffect_PSAlphaTestEqNeNoFog, sizeof(AlphaTestEffect_PSAlphaTestEqNeNoFog) },
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};
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template<>
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const int EffectBase<AlphaTestEffectTraits>::PixelShaderIndices[] =
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{
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0, // lt/gt
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1, // lt/gt, no fog
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0, // lt/gt, vertex color
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1, // lt/gt, vertex color, no fog
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2, // eq/ne
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3, // eq/ne, no fog
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2, // eq/ne, vertex color
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3, // eq/ne, vertex color, no fog
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};
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// Global pool of per-device AlphaTestEffect resources.
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template<>
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SharedResourcePool<ID3D11Device*, EffectBase<AlphaTestEffectTraits>::DeviceResources> EffectBase<AlphaTestEffectTraits>::deviceResourcesPool = {};
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// Constructor.
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AlphaTestEffect::Impl::Impl(_In_ ID3D11Device* device)
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: EffectBase(device),
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alphaFunction(D3D11_COMPARISON_GREATER),
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referenceAlpha(0),
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vertexColorEnabled(false)
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{
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static_assert(_countof(EffectBase<AlphaTestEffectTraits>::VertexShaderIndices) == AlphaTestEffectTraits::ShaderPermutationCount, "array/max mismatch");
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static_assert(_countof(EffectBase<AlphaTestEffectTraits>::VertexShaderBytecode) == AlphaTestEffectTraits::VertexShaderCount, "array/max mismatch");
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static_assert(_countof(EffectBase<AlphaTestEffectTraits>::PixelShaderBytecode) == AlphaTestEffectTraits::PixelShaderCount, "array/max mismatch");
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static_assert(_countof(EffectBase<AlphaTestEffectTraits>::PixelShaderIndices) == AlphaTestEffectTraits::ShaderPermutationCount, "array/max mismatch");
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}
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int AlphaTestEffect::Impl::GetCurrentShaderPermutation() const noexcept
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{
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int permutation = 0;
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// Use optimized shaders if fog is disabled.
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if (!fog.enabled)
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{
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permutation += 1;
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}
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// Support vertex coloring?
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if (vertexColorEnabled)
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{
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permutation += 2;
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}
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// Which alpha compare mode?
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if (alphaFunction == D3D11_COMPARISON_EQUAL ||
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alphaFunction == D3D11_COMPARISON_NOT_EQUAL)
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{
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permutation += 4;
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}
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return permutation;
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}
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// Sets our state onto the D3D device.
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void AlphaTestEffect::Impl::Apply(_In_ ID3D11DeviceContext* deviceContext)
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{
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// Compute derived parameter values.
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matrices.SetConstants(dirtyFlags, constants.worldViewProj);
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fog.SetConstants(dirtyFlags, matrices.worldView, constants.fogVector);
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color.SetConstants(dirtyFlags, constants.diffuseColor);
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// Recompute the alpha test settings?
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if (dirtyFlags & EffectDirtyFlags::AlphaTest)
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{
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// Convert reference alpha from 8 bit integer to 0-1 float format.
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auto reference = static_cast<float>(referenceAlpha) / 255.0f;
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// Comparison tolerance of half the 8 bit integer precision.
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const float threshold = 0.5f / 255.0f;
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// What to do if the alpha comparison passes or fails. Positive accepts the pixel, negative clips it.
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static const XMVECTORF32 selectIfTrue = { { { 1, -1 } } };
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static const XMVECTORF32 selectIfFalse = { { { -1, 1 } } };
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static const XMVECTORF32 selectNever = { { { -1, -1 } } };
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static const XMVECTORF32 selectAlways = { { { 1, 1 } } };
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float compareTo;
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XMVECTOR resultSelector;
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switch (alphaFunction)
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{
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case D3D11_COMPARISON_LESS:
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// Shader will evaluate: clip((a < x) ? z : w)
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compareTo = reference - threshold;
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resultSelector = selectIfTrue;
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break;
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case D3D11_COMPARISON_LESS_EQUAL:
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// Shader will evaluate: clip((a < x) ? z : w)
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compareTo = reference + threshold;
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resultSelector = selectIfTrue;
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break;
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case D3D11_COMPARISON_GREATER_EQUAL:
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// Shader will evaluate: clip((a < x) ? z : w)
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compareTo = reference - threshold;
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resultSelector = selectIfFalse;
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break;
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case D3D11_COMPARISON_GREATER:
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// Shader will evaluate: clip((a < x) ? z : w)
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compareTo = reference + threshold;
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resultSelector = selectIfFalse;
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break;
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case D3D11_COMPARISON_EQUAL:
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// Shader will evaluate: clip((abs(a - x) < y) ? z : w)
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compareTo = reference;
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resultSelector = selectIfTrue;
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break;
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case D3D11_COMPARISON_NOT_EQUAL:
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// Shader will evaluate: clip((abs(a - x) < y) ? z : w)
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compareTo = reference;
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resultSelector = selectIfFalse;
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break;
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case D3D11_COMPARISON_NEVER:
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// Shader will evaluate: clip((a < x) ? z : w)
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compareTo = 0;
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resultSelector = selectNever;
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break;
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case D3D11_COMPARISON_ALWAYS:
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// Shader will evaluate: clip((a < x) ? z : w)
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compareTo = 0;
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resultSelector = selectAlways;
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break;
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default:
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throw std::exception("Unknown alpha test function");
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}
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// x = compareTo, y = threshold, zw = resultSelector.
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constants.alphaTest = XMVectorPermute<0, 1, 4, 5>(XMVectorSet(compareTo, threshold, 0, 0), resultSelector);
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dirtyFlags &= ~EffectDirtyFlags::AlphaTest;
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dirtyFlags |= EffectDirtyFlags::ConstantBuffer;
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}
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// Set the texture.
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ID3D11ShaderResourceView* textures[1] = { texture.Get() };
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deviceContext->PSSetShaderResources(0, 1, textures);
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// Set shaders and constant buffers.
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ApplyShaders(deviceContext, GetCurrentShaderPermutation());
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}
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// Public constructor.
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AlphaTestEffect::AlphaTestEffect(_In_ ID3D11Device* device)
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: pImpl(std::make_unique<Impl>(device))
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{
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}
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// Move constructor.
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AlphaTestEffect::AlphaTestEffect(AlphaTestEffect&& moveFrom) noexcept
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: pImpl(std::move(moveFrom.pImpl))
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{
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}
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// Move assignment.
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AlphaTestEffect& AlphaTestEffect::operator= (AlphaTestEffect&& moveFrom) noexcept
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{
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pImpl = std::move(moveFrom.pImpl);
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return *this;
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}
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// Public destructor.
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AlphaTestEffect::~AlphaTestEffect()
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{
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}
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// IEffect methods.
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void AlphaTestEffect::Apply(_In_ ID3D11DeviceContext* deviceContext)
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{
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pImpl->Apply(deviceContext);
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}
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void AlphaTestEffect::GetVertexShaderBytecode(_Out_ void const** pShaderByteCode, _Out_ size_t* pByteCodeLength)
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{
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pImpl->GetVertexShaderBytecode(pImpl->GetCurrentShaderPermutation(), pShaderByteCode, pByteCodeLength);
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}
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// Camera settings.
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void XM_CALLCONV AlphaTestEffect::SetWorld(FXMMATRIX value)
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{
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pImpl->matrices.world = value;
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pImpl->dirtyFlags |= EffectDirtyFlags::WorldViewProj | EffectDirtyFlags::WorldInverseTranspose | EffectDirtyFlags::FogVector;
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}
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void XM_CALLCONV AlphaTestEffect::SetView(FXMMATRIX value)
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{
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pImpl->matrices.view = value;
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pImpl->dirtyFlags |= EffectDirtyFlags::WorldViewProj | EffectDirtyFlags::EyePosition | EffectDirtyFlags::FogVector;
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}
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void XM_CALLCONV AlphaTestEffect::SetProjection(FXMMATRIX value)
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{
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pImpl->matrices.projection = value;
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pImpl->dirtyFlags |= EffectDirtyFlags::WorldViewProj;
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}
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void XM_CALLCONV AlphaTestEffect::SetMatrices(FXMMATRIX world, CXMMATRIX view, CXMMATRIX projection)
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{
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pImpl->matrices.world = world;
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pImpl->matrices.view = view;
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pImpl->matrices.projection = projection;
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pImpl->dirtyFlags |= EffectDirtyFlags::WorldViewProj | EffectDirtyFlags::WorldInverseTranspose | EffectDirtyFlags::EyePosition | EffectDirtyFlags::FogVector;
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}
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// Material settings
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void XM_CALLCONV AlphaTestEffect::SetDiffuseColor(FXMVECTOR value)
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{
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pImpl->color.diffuseColor = value;
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pImpl->dirtyFlags |= EffectDirtyFlags::MaterialColor;
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}
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void AlphaTestEffect::SetAlpha(float value)
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{
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pImpl->color.alpha = value;
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pImpl->dirtyFlags |= EffectDirtyFlags::MaterialColor;
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}
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void XM_CALLCONV AlphaTestEffect::SetColorAndAlpha(FXMVECTOR value)
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{
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pImpl->color.diffuseColor = value;
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pImpl->color.alpha = XMVectorGetW(value);
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pImpl->dirtyFlags |= EffectDirtyFlags::MaterialColor;
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}
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// Fog settings.
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void AlphaTestEffect::SetFogEnabled(bool value)
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{
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pImpl->fog.enabled = value;
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pImpl->dirtyFlags |= EffectDirtyFlags::FogEnable;
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}
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void AlphaTestEffect::SetFogStart(float value)
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{
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pImpl->fog.start = value;
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pImpl->dirtyFlags |= EffectDirtyFlags::FogVector;
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}
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void AlphaTestEffect::SetFogEnd(float value)
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{
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pImpl->fog.end = value;
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pImpl->dirtyFlags |= EffectDirtyFlags::FogVector;
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}
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void XM_CALLCONV AlphaTestEffect::SetFogColor(FXMVECTOR value)
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{
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pImpl->constants.fogColor = value;
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pImpl->dirtyFlags |= EffectDirtyFlags::ConstantBuffer;
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}
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// Vertex color setting.
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void AlphaTestEffect::SetVertexColorEnabled(bool value)
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{
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pImpl->vertexColorEnabled = value;
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}
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// Texture settings.
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void AlphaTestEffect::SetTexture(_In_opt_ ID3D11ShaderResourceView* value)
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{
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pImpl->texture = value;
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}
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void AlphaTestEffect::SetAlphaFunction(D3D11_COMPARISON_FUNC value)
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{
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pImpl->alphaFunction = value;
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pImpl->dirtyFlags |= EffectDirtyFlags::AlphaTest;
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}
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void AlphaTestEffect::SetReferenceAlpha(int value)
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{
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pImpl->referenceAlpha = value;
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pImpl->dirtyFlags |= EffectDirtyFlags::AlphaTest;
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}
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