112 lines
4.3 KiB
HLSL
112 lines
4.3 KiB
HLSL
#ifndef GPU_INSTANCER_INCLUDED
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#define GPU_INSTANCER_INCLUDED
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#ifdef UNITY_PROCEDURAL_INSTANCING_ENABLED
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uniform uint gpui_InstanceID;
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uniform float4x4 gpuiTransformOffset;
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uniform float LODLevel; // -1 if crossFade disabled, 0-7 if cross fade enabled
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uniform float fadeLevelMultiplier; // 1 no animation
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#if GPUI_MHT_COPY_TEXTURE
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uniform sampler2D gpuiTransformationMatrixTexture;
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uniform sampler2D gpuiInstanceLODDataTexture;
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uniform float bufferSize;
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uniform float maxTextureSize;
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#elif GPUI_MHT_MATRIX_APPEND
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uniform StructuredBuffer<float4x4> gpuiTransformationMatrix;
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#else
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uniform StructuredBuffer<uint> gpuiTransformationMatrix;
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uniform StructuredBuffer<float4x4> gpuiInstanceData;
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uniform StructuredBuffer<uint4> gpuiInstanceLODData;
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#endif
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#ifdef unity_ObjectToWorld
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#undef unity_ObjectToWorld
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#endif
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#ifdef unity_WorldToObject
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#undef unity_WorldToObject
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#endif
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#endif // UNITY_PROCEDURAL_INSTANCING_ENABLED
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void setupGPUI()
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{
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#ifdef UNITY_PROCEDURAL_INSTANCING_ENABLED
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#if GPUI_MHT_COPY_TEXTURE
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uint textureWidth = min(bufferSize, maxTextureSize);
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float indexX = ((unity_InstanceID % maxTextureSize) + 0.5f) / textureWidth;
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float rowCount = ceil(bufferSize / maxTextureSize) * 4.0f;
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float rowIndex = floor(unity_InstanceID / maxTextureSize) * 4.0f + 0.5f;
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float4x4 transformData = float4x4(
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tex2Dlod(gpuiTransformationMatrixTexture, float4(indexX, (0.0f + rowIndex) / rowCount, 0.0f, 0.0f)), // row0
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tex2Dlod(gpuiTransformationMatrixTexture, float4(indexX, (1.0f + rowIndex) / rowCount, 0.0f, 0.0f)), // row1
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tex2Dlod(gpuiTransformationMatrixTexture, float4(indexX, (2.0f + rowIndex) / rowCount, 0.0f, 0.0f)), // row2
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tex2Dlod(gpuiTransformationMatrixTexture, float4(indexX, (3.0f + rowIndex) / rowCount, 0.0f, 0.0f)) // row3
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);
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gpui_InstanceID = uint(transformData._44);
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transformData._44 = 1.0f;
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unity_ObjectToWorld = mul(transformData, gpuiTransformOffset);
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#elif GPUI_MHT_MATRIX_APPEND
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unity_ObjectToWorld = mul(gpuiTransformationMatrix[unity_InstanceID], gpuiTransformOffset);
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#else
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gpui_InstanceID = gpuiTransformationMatrix[unity_InstanceID];
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unity_ObjectToWorld = mul(gpuiInstanceData[gpui_InstanceID], gpuiTransformOffset);
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#endif // SHADER_API
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#ifdef LOD_FADE_CROSSFADE
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unity_LODFade.x = 1;
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unity_LODFade.y = 16;
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if (LODLevel >= 0)
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{
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#ifdef GPUI_MHT_COPY_TEXTURE
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rowCount = ceil(bufferSize / maxTextureSize);
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rowIndex = floor(gpui_InstanceID / maxTextureSize) + 0.5f;
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uint4 lodData = uint4(tex2Dlod(gpuiInstanceLODDataTexture, float4(indexX, rowIndex / rowCount, 0.0f, 0.0f)));
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#else
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uint4 lodData = gpuiInstanceLODData[gpui_InstanceID];
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#endif
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if (lodData.w > 0)
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{
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float fadeLevel = floor(lodData.w * fadeLevelMultiplier);
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if (lodData.z == uint(LODLevel))
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fadeLevel = - fadeLevel;
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unity_LODFade.x = fadeLevel / 16.0;
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unity_LODFade.y = fadeLevel;
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}
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}
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#endif
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// inverse transform matrix
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// taken from richardkettlewell's post on
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// https://forum.unity3d.com/threads/drawmeshinstancedindirect-example-comments-and-questions.446080/
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float3x3 w2oRotation;
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w2oRotation[0] = unity_ObjectToWorld[1].yzx * unity_ObjectToWorld[2].zxy - unity_ObjectToWorld[1].zxy * unity_ObjectToWorld[2].yzx;
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w2oRotation[1] = unity_ObjectToWorld[0].zxy * unity_ObjectToWorld[2].yzx - unity_ObjectToWorld[0].yzx * unity_ObjectToWorld[2].zxy;
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w2oRotation[2] = unity_ObjectToWorld[0].yzx * unity_ObjectToWorld[1].zxy - unity_ObjectToWorld[0].zxy * unity_ObjectToWorld[1].yzx;
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float det = dot(unity_ObjectToWorld[0].xyz, w2oRotation[0]);
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w2oRotation = transpose(w2oRotation);
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w2oRotation *= rcp(det);
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float3 w2oPosition = mul(w2oRotation, -unity_ObjectToWorld._14_24_34);
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unity_WorldToObject._11_21_31_41 = float4(w2oRotation._11_21_31, 0.0f);
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unity_WorldToObject._12_22_32_42 = float4(w2oRotation._12_22_32, 0.0f);
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unity_WorldToObject._13_23_33_43 = float4(w2oRotation._13_23_33, 0.0f);
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unity_WorldToObject._14_24_34_44 = float4(w2oPosition, 1.0f);
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#if defined(UNITY_PREV_MATRIX_M) && !defined(BUILTIN_TARGET_API)
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unity_MatrixPreviousM = unity_ObjectToWorld;
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#endif
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#endif // UNITY_PROCEDURAL_INSTANCING_ENABLED
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}
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#endif // GPU_INSTANCER_INCLUDED
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// GPUInstancerInclude.cginc [do not delete needed for IsShaderInstanced check] |