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93 行
4.0 KiB
93 行
4.0 KiB
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// These functions are use to hide the handling of triplanar mapping
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// Normal need a specific treatment as they use special encoding for both base and detail map
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// Also we use multiple inclusion to handle the various variation for lod and bias
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// param can be unused, lod or bias
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float4 ADD_FUNC_SUFFIX(SampleLayer)(TEXTURE2D_ARGS(layerTex, layerSampler), LayerUV layerUV, float3 triplanarWeights, float param)
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{
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if (layerUV.isTriplanar)
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{
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float4 val = float4(0.0, 0.0, 0.0, 0.0);
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if (triplanarWeights.x > 0.0)
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val += triplanarWeights.x * SAMPLE_TEXTURE_FUNC(layerTex, layerSampler, layerUV.uvYZ, param);
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if (triplanarWeights.y > 0.0)
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val += triplanarWeights.y * SAMPLE_TEXTURE_FUNC(layerTex, layerSampler, layerUV.uvZX, param);
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if (triplanarWeights.z > 0.0)
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val += triplanarWeights.z * SAMPLE_TEXTURE_FUNC(layerTex, layerSampler, layerUV.uvXY, param);
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return val;
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}
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else
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{
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return SAMPLE_TEXTURE_FUNC(layerTex, layerSampler, layerUV.uv, param);
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}
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}
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// TODO: Handle BC5 format, currently this code is for DXT5nm - After the change, rename this function UnpackNormalmapRGorAG
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// This version is use for the base normal map
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float3 ADD_FUNC_SUFFIX(SampleLayerNormal)(TEXTURE2D_ARGS(layerTex, layerSampler), LayerUV layerUV, float3 triplanarWeights, float scale, float param)
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{
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if (layerUV.isTriplanar)
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{
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float3 val = float3(0.0, 0.0, 0.0);
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if (triplanarWeights.x > 0.0)
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val += triplanarWeights.x * UnpackNormalAG(SAMPLE_TEXTURE_FUNC(layerTex, layerSampler, layerUV.uvYZ, param), scale);
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if (triplanarWeights.y > 0.0)
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val += triplanarWeights.y * UnpackNormalAG(SAMPLE_TEXTURE_FUNC(layerTex, layerSampler, layerUV.uvZX, param), scale);
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if (triplanarWeights.z > 0.0)
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val += triplanarWeights.z * UnpackNormalAG(SAMPLE_TEXTURE_FUNC(layerTex, layerSampler, layerUV.uvXY, param), scale);
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return normalize(val);
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}
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else
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{
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return UnpackNormalAG(SAMPLE_TEXTURE_FUNC(layerTex, layerSampler, layerUV.uv, param), scale);
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}
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}
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// This version is for normalmap with AG encoding only. Mainly use with details map.
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float3 ADD_FUNC_SUFFIX(SampleLayerNormalAG)(TEXTURE2D_ARGS(layerTex, layerSampler), LayerUV layerUV, float3 triplanarWeights, float scale, float param)
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{
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if (layerUV.isTriplanar)
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{
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float3 val = float3(0.0, 0.0, 0.0);
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if (triplanarWeights.x > 0.0)
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val += triplanarWeights.x * UnpackNormalAG(SAMPLE_TEXTURE_FUNC(layerTex, layerSampler, layerUV.uvYZ, param), scale);
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if (triplanarWeights.y > 0.0)
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val += triplanarWeights.y * UnpackNormalAG(SAMPLE_TEXTURE_FUNC(layerTex, layerSampler, layerUV.uvZX, param), scale);
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if (triplanarWeights.z > 0.0)
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val += triplanarWeights.z * UnpackNormalAG(SAMPLE_TEXTURE_FUNC(layerTex, layerSampler, layerUV.uvXY, param), scale);
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return normalize(val);
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}
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else
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{
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return UnpackNormalAG(SAMPLE_TEXTURE_FUNC(layerTex, layerSampler, layerUV.uv, param), scale);
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}
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}
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// This version is for normalmap with RGB encoding only, i.e uncompress or BC7. Mainly used for object space normal.
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float3 ADD_FUNC_SUFFIX(SampleLayerNormalRGB)(TEXTURE2D_ARGS(layerTex, layerSampler), LayerUV layerUV, float3 triplanarWeights, float scale, float param)
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{
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if (layerUV.isTriplanar)
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{
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float3 val = float3(0.0, 0.0, 0.0);
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if (triplanarWeights.x > 0.0)
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val += triplanarWeights.x * UnpackNormalRGB(SAMPLE_TEXTURE_FUNC(layerTex, layerSampler, layerUV.uvYZ, param), scale);
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if (triplanarWeights.y > 0.0)
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val += triplanarWeights.y * UnpackNormalRGB(SAMPLE_TEXTURE_FUNC(layerTex, layerSampler, layerUV.uvZX, param), scale);
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if (triplanarWeights.z > 0.0)
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val += triplanarWeights.z * UnpackNormalRGB(SAMPLE_TEXTURE_FUNC(layerTex, layerSampler, layerUV.uvXY, param), scale);
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return normalize(val);
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}
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else
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{
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return UnpackNormalRGB(SAMPLE_TEXTURE_FUNC(layerTex, layerSampler, layerUV.uv, param), scale);
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}
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}
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