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// Gather all kind of mapping in one struct, allow to improve code readability
struct LayerUV
{
float2 uv;
// triplanar
bool isTriplanar;
float2 uvYZ;
float2 uvZX;
float2 uvXY;
};
// Multiple includes of the file to handle all variations of textures sampling for regular, lod and bias
// Regular sampling functions
#define ADD_FUNC_SUFFIX(Name) Name
#define SAMPLE_TEXTURE_FUNC(layerTex, layerSampler, layerUV, unused) SAMPLE_TEXTURE2D(layerTex, layerSampler, layerUV)
#include "SampleLayerInternal.hlsl"
#undef ADD_FUNC_SUFFIX
#undef SAMPLE_TEXTURE_FUNC
// Lod sampling functions
#define ADD_FUNC_SUFFIX(Name) Name##Lod
#define SAMPLE_TEXTURE_FUNC(layerTex, layerSampler, layerUV, lod) SAMPLE_TEXTURE2D_LOD(layerTex, layerSampler, layerUV, lod)
#include "SampleLayerInternal.hlsl"
#undef ADD_FUNC_SUFFIX
#undef SAMPLE_TEXTURE_FUNC
// Bias sampling functions
#define ADD_FUNC_SUFFIX(Name) Name##Bias
#define SAMPLE_TEXTURE_FUNC(layerTex, layerSampler, layerUV, bias) SAMPLE_TEXTURE2D_BIAS(layerTex, layerSampler, layerUV, bias)
#include "SampleLayerInternal.hlsl"
#undef ADD_FUNC_SUFFIX
#undef SAMPLE_TEXTURE_FUNC
// Macro to improve readibility of surface data
#define SAMPLE_LAYER_TEXTURE2D(textureName, samplerName, coord) SampleLayer(TEXTURE2D_PARAM(textureName, samplerName), coord, layerTexCoord.weights, 0.0) // Last 0.0 is unused
#define SAMPLE_LAYER_TEXTURE2D_LOD(textureName, samplerName, coord, lod) SampleLayerLod(TEXTURE2D_PARAM(textureName, samplerName), coord, layerTexCoord.weights, lod)
#define SAMPLE_LAYER_TEXTURE2D_BIAS(textureName, samplerName, coord, bias) SampleLayerBias(TEXTURE2D_PARAM(textureName, samplerName), coord, layerTexCoord.weights, bias)
#define SAMPLE_LAYER_NORMALMAP(textureName, samplerName, coord, scale) SampleLayerNormal(TEXTURE2D_PARAM(textureName, samplerName), coord, layerTexCoord.weights, scale, 0.0)
#define SAMPLE_LAYER_NORMALMAP_LOD(textureName, samplerName, coord, scale, lod) SampleLayerNormalLod(TEXTURE2D_PARAM(textureName, samplerName), coord, layerTexCoord.weights, scale, lod)
#define SAMPLE_LAYER_NORMALMAP_BIAS(textureName, samplerName, coord, scale, bias) SampleLayerNormalBias(TEXTURE2D_PARAM(textureName, samplerName), coord, layerTexCoord.weights, scale, bias)
#define SAMPLE_LAYER_NORMALMAP_AG(textureName, samplerName, coord, scale) SampleLayerNormalAG(TEXTURE2D_PARAM(textureName, samplerName), coord, layerTexCoord.weights, scale, 0.0)
#define SAMPLE_LAYER_NORMALMAP_AG_LOD(textureName, samplerName, coord, scale, lod) SampleLayerNormalAGLod(TEXTURE2D_PARAM(textureName, samplerName), coord, layerTexCoord.weights, scale, lod)
#define SAMPLE_LAYER_NORMALMAP_AG_BIAS(textureName, samplerName, coord, scale, bias) SampleLayerNormalAGBias(TEXTURE2D_PARAM(textureName, samplerName), coord, layerTexCoord.weights, scale, bias)
#define SAMPLE_LAYER_NORMALMAP_RGB(textureName, samplerName, coord, scale) SampleLayerNormalRGB(TEXTURE2D_PARAM(textureName, samplerName), coord, layerTexCoord.weights, scale, 0.0)
#define SAMPLE_LAYER_NORMALMAP_RGB_LOD(textureName, samplerName, coord, scale, lod) SampleLayerNormalRGBLod(TEXTURE2D_PARAM(textureName, samplerName), coord, layerTexCoord.weights, scale, lod)
#define SAMPLE_LAYER_NORMALMAP_RGB_BIAS(textureName, samplerName, coord, scale, bias) SampleLayerNormalRGBBias(TEXTURE2D_PARAM(textureName, samplerName), coord, layerTexCoord.weights, scale, bias)