472 lines
18 KiB
HLSL
472 lines
18 KiB
HLSL
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#ifndef TEXTURESTACK_include
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#define TEXTURESTACK_include
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#define GRA_HLSL_5 1
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#define GRA_ROW_MAJOR 1
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#define GRA_TEXTURE_ARRAY_SUPPORT 1
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#define GRA_PACK_RESOLVE_OUTPUT 0
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#if SHADER_API_PSSL
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#define GRA_NO_UNORM 1
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#endif
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#include "VirtualTexturing.hlsl"
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#include "Packing.hlsl"
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/*
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Warning: the following guide is subject to change due to VT's experimental status.
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For more information, visit https://docs.unity3d.com/ScriptReference/UnityEngine.VirtualTexturingModule.html.
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This header adds the following pseudo definitions. Actual types etc may vary depending
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on vt- being on or off.
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struct StackInfo { opaque struct ... }
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struct VTProperty { opaque struct ... }
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struct VTPropertyWithTextureType { VTProperty + int layerTextureType[4] }
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StackInfo PrepareVT(VTProperty vtProperty, VtInputParameters vtParams)
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float4 SampleVTLayerWithTextureType(VTPropertyWithTextureType vtPropWithTexType, VtInputParameters vtParams, StackInfo info, [immediate] int layerIndex)
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("int layerIndex" cannot be a variable or expression, must be an immediate constant)
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To use this in your materials add the following to various locations in the shader:
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In shaderlab "Properties" section add:
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[TextureStack.MyFancyStack] DiffuseTexture ("DiffuseTexture", 2D) = "white" {}
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[TextureStack.MyFancyStack] NormalTexture ("NormalTexture", 2D) = "white" {}
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This will declare a texture stack with two textures.
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Then add the following to the PerMaterial constant buffer:
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CBUFFER_START(UnityPerMaterial)
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...
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DECLARE_STACK_CB(MyFancyStack)
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...
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CBUFFER_END
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Then in your shader root add the following:
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...
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DECLARE_STACK(MyFancyStack, DiffuseTexture)
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or
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DECLARE_STACK2(MyFancyStack, DiffuseTexture, NormalTexture)
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or
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DECLARE_STACK3(MyFancyStack, TextureSlot1, TextureSlot2, TextureSlot2)
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etc...
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NOTE: The Stack shaderlab property and DECLARE_STACKn define need to match i.e. the same name and same texture slots.
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Then in the pixel shader function (likely somewhere at the beginning) do:
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VTPropertyWithTextureType vtPropWithTexType = AddTextureType(BuildVTProperties_MyFancyStack(), TEXTURETYPE_DEFAULT, TEXTURETYPE_DEFAULT, ...);
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// or: TEXTURETYPE_NORMALTANGENTSPACE / TEXTURETYPE_NORMALOBJECTSPACE, match with each texture slot's actual texture type.
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VtInputParameters vtParams;
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vtParams.uv = uv;
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vtParams.lodOrOffset = 0.0f;
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...
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StackInfo info = PrepareVT(vtPropWithTexType.vtProperty, vtParams);
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Then later on when you want to sample the actual texture do a call(s):
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// LayerIndex must be an immediate constant, do not use a variable or expression.
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float4 color1 = SampleVTLayerWithTextureType(vtPropWithTexType, vtParams, info, 0);
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float4 color2 = SampleVTLayerWithTextureType(vtPropWithTexType, vtParams, info, 1);
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...
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The above steps can be repeated for multiple stacks. But be sure that when using the SampleVTLayerWithTextureType you always
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pass in the VtInputParameters + the result of the AddTextureType and PrepareVT for the correct stack the texture belongs to.
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Also, for tiles to be automatically loaded, you need to write to the VT Feedback texture
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(SV_Target1) by yourself in the "ForwardOnly" pass. For example:
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#if defined(UNITY_VIRTUAL_TEXTURING) && defined(SHADER_API_PSSL)
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// Prevent loss of precision on some Sony platforms.
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#pragma PSSL_target_output_format(target 1 FMT_32_ABGR)
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#endif
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void Frag(PackedVaryingsToPS packedInput, out float4 outColor : SV_Target0
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#ifdef UNITY_VIRTUAL_TEXTURING
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, out float4 outVTFeedback : SV_Target1
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#endif
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, ...)
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{
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... (PrepareVT and SampleVTLayerWithTextureType called at some point)
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#ifdef UNITY_VIRTUAL_TEXTURING
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float4 resolveOutput = GetResolveOutput(info);
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float4 vtPackedFeedback = GetPackedVTFeedback(resolveOutput);
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outVTFeedback = PackVTFeedbackWithAlpha(vtPackedFeedback, screenSpacePos.xy, color1.a);
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// Include "Packages/com.unity.render-pipelines.high-definition/Runtime/ShaderLibrary/ShaderVariables.hlsl"
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// for "PackVTFeedbackWithAlpha".
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#endif
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...
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}
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If multiple stacks are present on the same pixel, alternate between resolve outputs in the following manner
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and pass the result to "GetPackedVTFeedback", etc... to ensure that all relevant tiles get loaded properly:
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...
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float4 resolveOutput = GetResolveOutput(info);
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float4 resolveOutput2 = GetResolveOutput(info2);
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float4 resolveOutputs[2] = { resolveOutput, resolveOutput2 };
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uint pixelColumn = screenSpacePos.x;
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float4 actualResolveOutput = resolveOutputs[(pixelColumn + _FrameCount) % 2];
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float4 vtPackedFeedback = GetPackedVTFeedback(actualResolveOutput);
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outVTFeedback = PackVTFeedbackWithAlpha(vtPackedFeedback, ...
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...
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*/
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#if defined(UNITY_VIRTUAL_TEXTURING) && !defined(FORCE_VIRTUAL_TEXTURING_OFF)
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struct StackInfo
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{
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GraniteLookupData lookupData;
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GraniteLODLookupData lookupDataLod;
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float4 resolveOutput;
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};
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struct VTProperty
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{
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GraniteConstantBuffers grCB;
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GraniteTranslationTexture translationTable;
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GraniteCacheTexture cacheLayer[4];
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int layerCount;
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int layerIndex[4];
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};
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#ifdef TEXTURESTACK_CLAMP
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#define GR_LOOKUP Granite_Lookup_Clamp_Linear
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#define GR_LOOKUP_LOD Granite_Lookup_Clamp
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#else
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#define GR_LOOKUP Granite_Lookup_Anisotropic
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#define GR_LOOKUP_LOD Granite_Lookup
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#endif
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// This can be used by certain resolver implementations to override screen space derivatives
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#ifndef RESOLVE_SCALE_OVERRIDE
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#define RESOLVE_SCALE_OVERRIDE float2(1,1)
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#endif
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#ifndef VT_CACHE_SAMPLER
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#define VT_CACHE_SAMPLER sampler_clamp_trilinear_aniso4
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SAMPLER(VT_CACHE_SAMPLER);
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#endif
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StructuredBuffer<GraniteTilesetConstantBuffer> _VTTilesetBuffer;
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#define DECLARE_STACK_CB(stackName) \
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float4 stackName##_atlasparams[2]
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#define DECLARE_STACK_BASE(stackName) \
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TEXTURE2D(stackName##_transtab);\
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SAMPLER(sampler##stackName##_transtab);\
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\
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GraniteTilesetConstantBuffer GetConstantBuffer_##stackName() \
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{ \
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int idx = (int)stackName##_atlasparams[1].w; \
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GraniteTilesetConstantBuffer graniteParamBlock; \
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graniteParamBlock = _VTTilesetBuffer[idx]; \
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\
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graniteParamBlock.data[0][2][0] *= RESOLVE_SCALE_OVERRIDE.x; \
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graniteParamBlock.data[0][3][0] *= RESOLVE_SCALE_OVERRIDE.y; \
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\
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return graniteParamBlock; \
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} \
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StackInfo PrepareVT_##stackName(VtInputParameters par)\
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{\
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GraniteStreamingTextureConstantBuffer textureParamBlock;\
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textureParamBlock.data[0] = stackName##_atlasparams[0];\
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textureParamBlock.data[1] = stackName##_atlasparams[1];\
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\
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GraniteTilesetConstantBuffer graniteParamBlock = GetConstantBuffer_##stackName(); \
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\
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GraniteConstantBuffers grCB;\
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grCB.tilesetBuffer = graniteParamBlock;\
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grCB.streamingTextureBuffer = textureParamBlock;\
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\
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GraniteTranslationTexture translationTable;\
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translationTable.Texture = stackName##_transtab;\
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translationTable.Sampler = sampler##stackName##_transtab;\
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\
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StackInfo info;\
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VirtualTexturingLookup(grCB, translationTable, par, info.lookupData, info.resolveOutput);\
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return info;\
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}
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// TODO: we could replace all uses of GetConstantBuffer_*() with this one:
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GraniteTilesetConstantBuffer GetConstantBuffer(GraniteStreamingTextureConstantBuffer textureParamBlock)
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{
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int idx = (int)textureParamBlock.data[1].w;
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GraniteTilesetConstantBuffer graniteParamBlock;
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graniteParamBlock = _VTTilesetBuffer[idx];
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graniteParamBlock.data[0][2][0] *= RESOLVE_SCALE_OVERRIDE.x;
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graniteParamBlock.data[0][3][0] *= RESOLVE_SCALE_OVERRIDE.y;
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return graniteParamBlock;
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}
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#define jj2(a, b) a##b
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#define jj(a, b) jj2(a, b)
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#define DECLARE_STACK_LAYER(stackName, layerSamplerName, layerIndex) \
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TEXTURE2D_ARRAY(stackName##_c##layerIndex);
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#define DECLARE_BUILD_PROPERTIES(stackName, layers, layer0Index, layer1Index, layer2Index, layer3Index)\
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VTProperty BuildVTProperties_##stackName()\
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{\
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VTProperty vtProperty; \
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\
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GraniteStreamingTextureConstantBuffer textureParamBlock; \
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textureParamBlock.data[0] = stackName##_atlasparams[0]; \
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textureParamBlock.data[1] = stackName##_atlasparams[1]; \
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\
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vtProperty.grCB.tilesetBuffer = GetConstantBuffer(textureParamBlock); \
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vtProperty.grCB.streamingTextureBuffer = textureParamBlock; \
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\
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vtProperty.translationTable.Texture = stackName##_transtab; \
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vtProperty.translationTable.Sampler = sampler##stackName##_transtab; \
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\
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vtProperty.layerCount = layers; \
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vtProperty.layerIndex[0] = layer0Index; \
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vtProperty.layerIndex[1] = layer1Index; \
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vtProperty.layerIndex[2] = layer2Index; \
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vtProperty.layerIndex[3] = layer3Index; \
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\
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vtProperty.cacheLayer[0].TextureArray = stackName##_c##layer0Index; \
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ASSIGN_SAMPLER(vtProperty.cacheLayer[0].Sampler, VT_CACHE_SAMPLER);\
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vtProperty.cacheLayer[1].TextureArray = stackName##_c##layer1Index; \
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ASSIGN_SAMPLER(vtProperty.cacheLayer[1].Sampler, VT_CACHE_SAMPLER);\
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vtProperty.cacheLayer[2].TextureArray = stackName##_c##layer2Index; \
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ASSIGN_SAMPLER(vtProperty.cacheLayer[2].Sampler, VT_CACHE_SAMPLER);\
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vtProperty.cacheLayer[3].TextureArray = stackName##_c##layer3Index; \
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ASSIGN_SAMPLER(vtProperty.cacheLayer[3].Sampler, VT_CACHE_SAMPLER);\
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\
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return vtProperty; \
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}
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#define DECLARE_STACK(stackName, layer0SamplerName)\
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DECLARE_STACK_BASE(stackName)\
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DECLARE_STACK_LAYER(stackName, layer0SamplerName, 0)\
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DECLARE_BUILD_PROPERTIES(stackName, 1, 0, 0, 0, 0)
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#define DECLARE_STACK2(stackName, layer0SamplerName, layer1SamplerName)\
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DECLARE_STACK_BASE(stackName)\
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DECLARE_STACK_LAYER(stackName, layer0SamplerName, 0)\
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DECLARE_STACK_LAYER(stackName, layer1SamplerName, 1)\
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DECLARE_BUILD_PROPERTIES(stackName, 2, 0, 1, 1, 1)
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#define DECLARE_STACK3(stackName, layer0SamplerName, layer1SamplerName, layer2SamplerName)\
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DECLARE_STACK_BASE(stackName)\
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DECLARE_STACK_LAYER(stackName, layer0SamplerName, 0)\
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DECLARE_STACK_LAYER(stackName, layer1SamplerName, 1)\
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DECLARE_STACK_LAYER(stackName, layer2SamplerName, 2)\
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DECLARE_BUILD_PROPERTIES(stackName, 3, 0, 1, 2, 2)
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#define DECLARE_STACK4(stackName, layer0SamplerName, layer1SamplerName, layer2SamplerName, layer3SamplerName)\
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DECLARE_STACK_BASE(stackName)\
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DECLARE_STACK_LAYER(stackName, layer0SamplerName, 0)\
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DECLARE_STACK_LAYER(stackName, layer1SamplerName, 1)\
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DECLARE_STACK_LAYER(stackName, layer2SamplerName, 2)\
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DECLARE_STACK_LAYER(stackName, layer3SamplerName, 3)\
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DECLARE_BUILD_PROPERTIES(stackName, 4, 0, 1, 2, 3)
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#define PrepareStack(inputParams, stackName) PrepareVT_##stackName(inputParams)
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#define SampleStack(info, lodMode, quality, textureName) SampleVT_##textureName(info, lodMode, quality)
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#define GetResolveOutput(info) info.resolveOutput
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#define PackResolveOutput(output) Granite_PackTileId(output)
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StackInfo PrepareVT(VTProperty vtProperty, VtInputParameters vtParams)
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{
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StackInfo info;
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VirtualTexturingLookup(vtProperty.grCB, vtProperty.translationTable, vtParams, info.lookupData, info.resolveOutput);
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return info;
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}
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// NOTE: layerIndex here can only be an immediate constant (i.e. 0,1,2, or 3) -- it CANNOT be a variable or expression
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// this is because we use macro concatentation on it when VT is disabled
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float4 SampleVTLayer(VTProperty vtProperty, VtInputParameters vtParams, StackInfo info, int layerIndex)
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{
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float4 result;
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VirtualTexturingSample(vtProperty.grCB.tilesetBuffer, info.lookupData, vtProperty.cacheLayer[layerIndex], vtProperty.layerIndex[layerIndex], vtParams.levelMode, vtParams.sampleQuality, result);
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return result;
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}
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float4 GetPackedVTFeedback(float4 feedback)
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{
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return Granite_PackTileId(feedback);
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}
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#define VIRTUAL_TEXTURING_SHADER_ENABLED
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#else
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// Virtual Texturing Disabled -- fallback to regular texture sampling
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#define DECLARE_BUILD_PROPERTIES(stackName, layers, layer0, layer1, layer2, layer3)\
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VTProperty BuildVTProperties_##stackName()\
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{\
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VTProperty vtProperty; \
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\
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vtProperty.layerCount = layers; \
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vtProperty.Layer0 = layer0; \
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vtProperty.Layer1 = layer1; \
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vtProperty.Layer2 = layer2; \
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vtProperty.Layer3 = layer3; \
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\
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ASSIGN_SAMPLER(vtProperty.samplerLayer0, sampler##layer0); \
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ASSIGN_SAMPLER(vtProperty.samplerLayer1, sampler##layer1); \
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ASSIGN_SAMPLER(vtProperty.samplerLayer2, sampler##layer2); \
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ASSIGN_SAMPLER(vtProperty.samplerLayer3, sampler##layer3); \
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\
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return vtProperty; \
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}
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// Stacks amount to nothing when VT is off
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#define DECLARE_STACK(stackName, layer0) \
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DECLARE_BUILD_PROPERTIES(stackName, 1, layer0, layer0, layer0, layer0)
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#define DECLARE_STACK2(stackName, layer0, layer1) \
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DECLARE_BUILD_PROPERTIES(stackName, 2, layer0, layer1, layer1, layer1)
|
||
|
|
|
||
|
|
#define DECLARE_STACK3(stackName, layer0, layer1, layer2) \
|
||
|
|
DECLARE_BUILD_PROPERTIES(stackName, 3, layer0, layer1, layer2, layer2)
|
||
|
|
|
||
|
|
#define DECLARE_STACK4(stackName, layer0, layer1, layer2, layer3) \
|
||
|
|
DECLARE_BUILD_PROPERTIES(stackName, 4, layer0, layer1, layer2, layer3)
|
||
|
|
|
||
|
|
#define DECLARE_STACK_CB(stackName)
|
||
|
|
|
||
|
|
// Info is just the uv's
|
||
|
|
// We could do a straight #define StackInfo float2 but this makes it a bit more type safe
|
||
|
|
// and allows us to do things like function overloads,...
|
||
|
|
struct StackInfo
|
||
|
|
{
|
||
|
|
VtInputParameters vt;
|
||
|
|
};
|
||
|
|
|
||
|
|
struct VTProperty
|
||
|
|
{
|
||
|
|
int layerCount;
|
||
|
|
TEXTURE2D(Layer0);
|
||
|
|
TEXTURE2D(Layer1);
|
||
|
|
TEXTURE2D(Layer2);
|
||
|
|
TEXTURE2D(Layer3);
|
||
|
|
SAMPLER(samplerLayer0);
|
||
|
|
SAMPLER(samplerLayer1);
|
||
|
|
SAMPLER(samplerLayer2);
|
||
|
|
SAMPLER(samplerLayer3);
|
||
|
|
};
|
||
|
|
|
||
|
|
StackInfo MakeStackInfo(VtInputParameters vt)
|
||
|
|
{
|
||
|
|
StackInfo result;
|
||
|
|
result.vt = vt;
|
||
|
|
return result;
|
||
|
|
}
|
||
|
|
|
||
|
|
// Prepare just passes the texture coord around
|
||
|
|
#define PrepareStack(inputParams, stackName) MakeStackInfo(inputParams)
|
||
|
|
|
||
|
|
// Sample just samples the texture
|
||
|
|
#define SampleStack(info, vtLevelMode, quality, texture) \
|
||
|
|
SampleVTFallbackToTexture(info, vtLevelMode, TEXTURE2D_ARGS(texture, sampler##texture))
|
||
|
|
|
||
|
|
|
||
|
|
float4 SampleVTFallbackToTexture(StackInfo info, int vtLevelMode, TEXTURE2D_PARAM(layerTexture, layerSampler))
|
||
|
|
{
|
||
|
|
if (info.vt.enableGlobalMipBias)
|
||
|
|
{
|
||
|
|
if (vtLevelMode == VtLevel_Automatic)
|
||
|
|
return SAMPLE_TEXTURE2D(layerTexture, layerSampler, info.vt.uv);
|
||
|
|
else if (vtLevelMode == VtLevel_Lod)
|
||
|
|
return SAMPLE_TEXTURE2D_LOD(layerTexture, layerSampler, info.vt.uv, info.vt.lodOrOffset);
|
||
|
|
else if (vtLevelMode == VtLevel_Bias)
|
||
|
|
return SAMPLE_TEXTURE2D_BIAS(layerTexture, layerSampler, info.vt.uv, info.vt.lodOrOffset);
|
||
|
|
else // vtLevelMode == VtLevel_Derivatives
|
||
|
|
return SAMPLE_TEXTURE2D_GRAD(layerTexture, layerSampler, info.vt.uv, info.vt.dx, info.vt.dy);
|
||
|
|
}
|
||
|
|
else
|
||
|
|
{
|
||
|
|
if (vtLevelMode == VtLevel_Automatic)
|
||
|
|
return PLATFORM_SAMPLE_TEXTURE2D(layerTexture, layerSampler, info.vt.uv);
|
||
|
|
else if (vtLevelMode == VtLevel_Lod)
|
||
|
|
return PLATFORM_SAMPLE_TEXTURE2D_LOD(layerTexture, layerSampler, info.vt.uv, info.vt.lodOrOffset);
|
||
|
|
else if (vtLevelMode == VtLevel_Bias)
|
||
|
|
return PLATFORM_SAMPLE_TEXTURE2D_BIAS(layerTexture, layerSampler, info.vt.uv, info.vt.lodOrOffset);
|
||
|
|
else // vtLevelMode == VtLevel_Derivatives
|
||
|
|
return PLATFORM_SAMPLE_TEXTURE2D_GRAD(layerTexture, layerSampler, info.vt.uv, info.vt.dx, info.vt.dy);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
StackInfo PrepareVT(VTProperty vtProperty, VtInputParameters vtParams)
|
||
|
|
{
|
||
|
|
StackInfo result;
|
||
|
|
result.vt = vtParams;
|
||
|
|
return result;
|
||
|
|
}
|
||
|
|
|
||
|
|
// NOTE: layerIndex here can only be an immediate constant (i.e. 0,1,2, or 3) -- it CANNOT be a variable or expression
|
||
|
|
// this is because we use macro concatentation on it when VT is disabled
|
||
|
|
#define SampleVTLayer(vtProperty, vtParams, info, layerIndex) \
|
||
|
|
SampleVTFallbackToTexture(info, vtParams.levelMode, TEXTURE2D_ARGS(vtProperty.Layer##layerIndex, vtProperty.samplerLayer##layerIndex))
|
||
|
|
|
||
|
|
// Resolve does nothing
|
||
|
|
#define GetResolveOutput(info) float4(1,1,1,1)
|
||
|
|
#define PackResolveOutput(output) output
|
||
|
|
#define GetPackedVTFeedback(feedback) feedback
|
||
|
|
|
||
|
|
#endif
|
||
|
|
|
||
|
|
|
||
|
|
|
||
|
|
// Shared code between VT enabled and VT disabled, adding TextureType handling
|
||
|
|
|
||
|
|
// these texture types should be kept in sync with LayerTextureType in C# code
|
||
|
|
#define TEXTURETYPE_DEFAULT 0 // LayerTextureType.Default
|
||
|
|
#define TEXTURETYPE_NORMALTANGENTSPACE 1 // LayerTextureType.NormalTangentSpace
|
||
|
|
#define TEXTURETYPE_NORMALOBJECTSPACE 2 // LayerTextureType.NormalObjectSpace
|
||
|
|
|
||
|
|
struct VTPropertyWithTextureType
|
||
|
|
{
|
||
|
|
VTProperty vtProperty;
|
||
|
|
int layerTextureType[4];
|
||
|
|
};
|
||
|
|
|
||
|
|
VTPropertyWithTextureType AddTextureType(VTProperty vtProperty, int layer0TextureType, int layer1TextureType = TEXTURETYPE_DEFAULT, int layer2TextureType = TEXTURETYPE_DEFAULT, int layer3TextureType = TEXTURETYPE_DEFAULT)
|
||
|
|
{
|
||
|
|
VTPropertyWithTextureType result;
|
||
|
|
result.vtProperty = vtProperty;
|
||
|
|
result.layerTextureType[0] = layer0TextureType;
|
||
|
|
result.layerTextureType[1] = layer1TextureType;
|
||
|
|
result.layerTextureType[2] = layer2TextureType;
|
||
|
|
result.layerTextureType[3] = layer3TextureType;
|
||
|
|
return result;
|
||
|
|
}
|
||
|
|
|
||
|
|
float4 ApplyTextureType(float4 value, int textureType)
|
||
|
|
{
|
||
|
|
// NOTE: when textureType is a compile-time constant, the branches compile out
|
||
|
|
if (textureType == TEXTURETYPE_NORMALTANGENTSPACE)
|
||
|
|
{
|
||
|
|
value.rgb = UnpackNormalmapRGorAG(value);
|
||
|
|
}
|
||
|
|
else if (textureType == TEXTURETYPE_NORMALOBJECTSPACE)
|
||
|
|
{
|
||
|
|
value.rgb = UnpackNormalRGB(value);
|
||
|
|
}
|
||
|
|
return value;
|
||
|
|
}
|
||
|
|
|
||
|
|
// if we _could_ express it as a function, the function signature would be:
|
||
|
|
// float4 SampleVTLayerWithTextureType(VTPropertyWithTextureType vtPropWithTexType, VtInputParameters vtParams, StackInfo info, [immediate] int layerIndex)
|
||
|
|
// NOTE: layerIndex here can only be an immediate constant (i.e. 0,1,2, or 3) -- it CANNOT be a variable or expression
|
||
|
|
// this is because we use macro concatentation on it when VT is disabled
|
||
|
|
|
||
|
|
#define SampleVTLayerWithTextureType(vtPropWithTexType, vtParams, info, layerIndex) \
|
||
|
|
ApplyTextureType(SampleVTLayer(vtPropWithTexType.vtProperty, vtParams, info, layerIndex), vtPropWithTexType.layerTextureType[layerIndex])
|
||
|
|
|
||
|
|
#endif //TEXTURESTACK_include
|