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152 行
10 KiB
152 行
10 KiB
// This file contains various helper declarations for declaring and sampling members of the ShadowContext struct.
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// shadow lookup routines when dynamic array access is possible
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#if SHADOW_SUPPORTS_DYNAMIC_INDEXING != 0
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// Shader model >= 5.1
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# define SHADOW_DEFINE_SAMPLING_FUNC_T2DA_COMP( _Tex2DArraySlots , _SamplerCompSlots ) real4 SampleCompShadow_T2DA( ShadowContext ctxt, uint texIdx, uint sampIdx, real3 tcs, real slice ) { return SAMPLE_TEXTURE2D_ARRAY_SHADOW( ctxt.tex2DArray[texIdx], ctxt.compSamplers[sampIdx], tcs, slice ); }
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# define SHADOW_DEFINE_SAMPLING_FUNC_T2DA_SAMP( _Tex2DArraySlots , _SamplerSlots ) real4 SampleShadow_T2DA( ShadowContext ctxt, uint texIdx, uint sampIdx, real2 tcs, real slice, real lod = 0.0 ) { return SAMPLE_TEXTURE2D_ARRAY_LOD( ctxt.tex2DArray[texIdx], ctxt.samplers[sampIdx], tcs, slice, lod ); }
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# define SHADOW_DEFINE_SAMPLING_FUNC_T2DA_LOAD( _Tex2DArraySlots ) real4 LoadShadow_T2DA( ShadowContext ctxt, uint texIdx, uint2 tcs, uint slice, uint lod = 0 ) { return LOAD_TEXTURE2D_ARRAY_LOD( ctxt.tex2DArray[texIdx], tcs, slice, lod ).x; }
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# define SHADOW_DEFINE_SAMPLING_FUNC_TCA_COMP( _TexCubeArraySlots, _SamplerCompSlots ) real4 SampleCompShadow_TCA( ShadowContext ctxt, uint texIdx, uint sampIdx, real4 tcs, real cubeIdx ) { return SAMPLE_TEXTURECUBE_ARRAY_SHADOW( ctxt.texCubeArray[texIdx], ctxt.compSamplers[sampIdx], tcs, cubeIdx );}
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# define SHADOW_DEFINE_SAMPLING_FUNC_TCA_SAMP( _TexCubeArraySlots, _SamplerSlots ) real4 SampleShadow_TCA( ShadowContext ctxt, uint texIdx, uint sampIdx, real3 tcs, real cubeIdx, real lod = 0.0 ) { return SAMPLE_TEXTURECUBE_ARRAY_LOD( ctxt.texCubeArray[texIdx], ctxt.samplers[sampIdx], tcs, cubeIdx, lod ); }
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#else // helper macros if dynamic indexing does not work
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// Sampler and texture combinations are static. No shadowmap will ever be sampled with two different samplers.
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// Once shadowmaps and samplers are fixed consider writing custom dispatchers directly accessing textures and samplers.
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# define SHADOW_DEFINE_SAMPLING_FUNC_T2DA_COMP( _Tex2DArraySlots, _SamplerCompSlots ) \
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real4 SampleCompShadow_T2DA( ShadowContext ctxt, uint texIdx, uint sampIdx, real3 tcs, real slice ) \
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{ \
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real4 res = 1.0.xxxx; \
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[unroll] for( uint i = 0; i < _Tex2DArraySlots; i++ ) \
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{ \
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[unroll] for( uint j = 0; j < _SamplerCompSlots; j++ ) \
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{ \
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[branch] if( i == texIdx && j == sampIdx ) \
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{ \
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res = SAMPLE_TEXTURE2D_ARRAY_SHADOW( ctxt.tex2DArray[i], ctxt.compSamplers[j], tcs, slice ); \
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break; \
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} \
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} \
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} \
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return res; \
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}
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# define SHADOW_DEFINE_SAMPLING_FUNC_T2DA_SAMP( _Tex2DArraySlots, _SamplerSlots ) \
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real4 SampleShadow_T2DA( ShadowContext ctxt, uint texIdx, uint sampIdx, real2 tcs, real slice, real lod = 0.0 ) \
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{ \
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real4 res = 1.0.xxxx; \
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[unroll] for( uint i = 0; i < _Tex2DArraySlots; i++ ) \
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{ \
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[unroll] for( uint j = 0; j < _SamplerSlots; j++ ) \
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{ \
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[branch] if( i == texIdx && j == sampIdx ) \
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{ \
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res = SAMPLE_TEXTURE2D_ARRAY_LOD( ctxt.tex2DArray[i], ctxt.samplers[j], tcs, slice, lod ); \
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break; \
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} \
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} \
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} \
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return res; \
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}
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# define SHADOW_DEFINE_SAMPLING_FUNC_T2DA_LOAD( _Tex2DArraySlots ) \
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real LoadShadow_T2DA( ShadowContext ctxt, uint texIdx, uint2 tcs, uint slice, uint lod = 0 ) \
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{ \
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real res = 1.0; \
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[unroll] for( uint i = 0; i < _Tex2DArraySlots; i++ ) \
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{ \
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[branch] if( i == texIdx ) \
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{ \
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res = LOAD_TEXTURE2D_ARRAY_LOD( ctxt.tex2DArray[i], tcs, slice, lod ).x; \
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break; \
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} \
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} \
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return res; \
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}
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# define SHADOW_DEFINE_SAMPLING_FUNC_TCA_COMP( _TexCubeArraySlots, _SamplerCompSlots ) \
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real4 SampleCompShadow_TCA( ShadowContext ctxt, uint texIdx, uint sampIdx, real4 tcs, real cubeIdx ) \
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{ \
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real4 res = 1.0.xxxx; \
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[unroll] for( uint i = 0; i < _TexCubeArraySlots; i++ ) \
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{ \
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[unroll] for( uint j = 0; j < _SamplerCompSlots; j++ ) \
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{ \
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[branch] if( i == texIdx && j == sampIdx ) \
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{ \
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res = SAMPLE_TEXTURECUBE_ARRAY_SHADOW( ctxt.texCubeArray[i], ctxt.compSamplers[j], tcs, cubeIdx ); \
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break; \
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} \
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} \
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} \
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return res; \
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}
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# define SHADOW_DEFINE_SAMPLING_FUNC_TCA_SAMP( _TexCubeArraySlots, _SamplerSlots ) \
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real4 SampleShadow_TCA( ShadowContext ctxt, uint texIdx, uint sampIdx, real3 tcs, real cubeIdx, real lod = 0.0 ) \
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{ \
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real4 res = 1.0.xxxx; \
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[unroll] for( uint i = 0; i < _TexCubeArraySlots; i++ ) \
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{ \
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[unroll] for( uint j = 0; j < _SamplerSlots; j++ ) \
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{ \
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[branch] if( i == texIdx && j == sampIdx ) \
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{ \
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res = SAMPLE_TEXTURECUBE_ARRAY_LOD( ctxt.texCubeArray[i], ctxt.samplers[j], tcs, cubeIdx, lod ); \
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break; \
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} \
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} \
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} \
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return res; \
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}
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#endif // SHADOW_SUPPORTS_DYNAMIC_INDEXING != 0
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// helper macro to suppress code generation if _cnt is 0
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#define SHADOW_DECLARE_SAMPLING_FUNC_T2DA_COMP( _Tex2DArraySlots , _SamplerCompSlots ) real4 SampleCompShadow_T2DA( ShadowContext ctxt, uint texIdx, uint sampIdx, real3 tcs, real slice );
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#define SHADOW_DECLARE_SAMPLING_FUNC_T2DA_SAMP( _Tex2DArraySlots , _SamplerSlots ) real4 SampleShadow_T2DA( ShadowContext ctxt, uint texIdx, uint sampIdx, real2 tcs, real slice, real lod = 0.0 );
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#define SHADOW_DECLARE_SAMPLING_FUNC_T2DA_LOAD( _Tex2DArraySlots ) real4 LoadShadow_T2DA( ShadowContext ctxt, uint texIdx, uint2 tcs, uint slice, uint lod = 0 );
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#define SHADOW_DECLARE_SAMPLING_FUNC_TCA_COMP( _TexCubeArraySlots, _SamplerCompSlots ) real4 SampleCompShadow_TCA( ShadowContext ctxt, uint texIdx, uint sampIdx, real4 tcs, real cubeIdx );
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#define SHADOW_DECLARE_SAMPLING_FUNC_TCA_SAMP( _TexCubeArraySlots, _SamplerSlots ) real4 SampleShadow_TCA( ShadowContext ctxt, uint texIdx, uint sampIdx, real3 tcs, real cubeIdx, real lod = 0.0 );
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#define SHADOW_CAT( _left, _right ) _left ## _right
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#define SHADOW_CHECK_0( _macro )
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#define SHADOW_CHECK_1( _macro ) _macro
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#define SHADOW_CHECK_2( _macro ) _macro
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#define SHADOW_CHECK_3( _macro ) _macro
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#define SHADOW_CHECK_4( _macro ) _macro
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#define SHADOW_CHECK_5( _macro ) _macro
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#define SHADOW_CHECK_6( _macro ) _macro
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#define SHADOW_CHECK_7( _macro ) _macro
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#define SHADOW_CHECK_8( _macro ) _macro
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#define SHADOW_CHECK_9( _macro ) _macro
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#define SHADOW_CHECK( _cnt, _macro ) SHADOW_CAT( SHADOW_CHECK_ , _cnt ) ( _macro )
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#define SHADOW_CHECK_ALT_0( _macro, _alt ) _alt
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#define SHADOW_CHECK_ALT_1( _macro, _alt ) _macro
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#define SHADOW_CHECK_ALT_2( _macro, _alt ) _macro
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#define SHADOW_CHECK_ALT_3( _macro, _alt ) _macro
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#define SHADOW_CHECK_ALT_4( _macro, _alt ) _macro
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#define SHADOW_CHECK_ALT_5( _macro, _alt ) _macro
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#define SHADOW_CHECK_ALT_6( _macro, _alt ) _macro
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#define SHADOW_CHECK_ALT_7( _macro, _alt ) _macro
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#define SHADOW_CHECK_ALT_8( _macro, _alt ) _macro
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#define SHADOW_CHECK_ALT_9( _macro, _alt ) _macro
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#define SHADOW_CHECK_ALT( _cnt, _macro, _alt ) SHADOW_CAT( SHADOW_CHECK_ALT_ , _cnt ) ( _macro, _alt )
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// helper macro to declare texture members for the shadow context.
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#define SHADOWCONTEXT_DECLARE_TEXTURES( _Tex2DArraySlots, _TexCubeArraySlots, _SamplerCompSlots, _SamplerSlots ) \
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SHADOW_CHECK( _Tex2DArraySlots , Texture2DArray tex2DArray[_Tex2DArraySlots]; ) \
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SHADOW_CHECK( _TexCubeArraySlots, TextureCubeArray texCubeArray[_TexCubeArraySlots]; ) \
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SHADOW_CHECK( _SamplerCompSlots , SamplerComparisonState compSamplers[_Tex2DArraySlots]; ) \
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SHADOW_CHECK( _SamplerSlots , SamplerState samplers[_Tex2DArraySlots]; )
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// helper macro to declare texture sampling functions for the shadow context.
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#define SHADOW_DEFINE_SAMPLING_FUNCS( _Tex2DArraySlots, _TexCubeArraySlots, _SamplerCompSlots, _SamplerSlots ) \
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SHADOW_CHECK( _Tex2DArraySlots , SHADOW_CHECK_ALT( _SamplerCompSlots, SHADOW_DEFINE_SAMPLING_FUNC_T2DA_COMP( _Tex2DArraySlots, _SamplerCompSlots ), SHADOW_DECLARE_SAMPLING_FUNC_T2DA_COMP( _Tex2DArraySlots, _SamplerCompSlots ) ) ) \
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SHADOW_CHECK( _Tex2DArraySlots , SHADOW_CHECK_ALT( _SamplerSlots , SHADOW_DEFINE_SAMPLING_FUNC_T2DA_SAMP( _Tex2DArraySlots, _SamplerSlots ), SHADOW_DECLARE_SAMPLING_FUNC_T2DA_SAMP( _Tex2DArraySlots, _SamplerSlots ) ) ) \
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SHADOW_CHECK_ALT( _Tex2DArraySlots , SHADOW_DEFINE_SAMPLING_FUNC_T2DA_LOAD( _Tex2DArraySlots ), SHADOW_DECLARE_SAMPLING_FUNC_T2DA_LOAD( _Tex2DArraySlots ) ) \
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SHADOW_CHECK( _TexCubeArraySlots, SHADOW_CHECK_ALT( _SamplerCompSlots, SHADOW_DEFINE_SAMPLING_FUNC_TCA_COMP(_TexCubeArraySlots, _SamplerCompSlots ), SHADOW_DECLARE_SAMPLING_FUNC_TCA_COMP(_TexCubeArraySlots, _SamplerCompSlots ) ) ) \
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SHADOW_CHECK( _TexCubeArraySlots, SHADOW_CHECK_ALT( _SamplerSlots , SHADOW_DEFINE_SAMPLING_FUNC_TCA_SAMP(_TexCubeArraySlots, _SamplerSlots ), SHADOW_DECLARE_SAMPLING_FUNC_TCA_SAMP(_TexCubeArraySlots, _SamplerSlots ) ) )
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