URP shader库中的一些常用宏

com.unity.render-pipelines.core/ShaderLibrary/Macros.hlsl

宏	定义
TRANSFORM_TEX(tex, name)	((tex.xy) * name##_ST.xy + name##_ST.zw)
GET_TEXELSIZE_NAME(name)	(name##_TexelSize)
PI	3.14159265358979323846
TWO_PI	6.28318530717958647693
FOUR_PI	12.5663706143591729538
INV_PI	0.31830988618379067154
INV_TWO_PI	0.15915494309189533577
INV_FOUR_PI	0.07957747154594766788
HALF_PI	1.57079632679489661923
INV_HALF_PI	0.63661977236758134308
LOG2_E	1.44269504088896340736
INV_SQRT2	0.70710678118654752440
PI_DIV_FOUR	0.78539816339744830961
FLT_INF	asfloat(0x7F800000)
FLT_EPS	5.960464478e-8 // 2^-24, machine epsilon: 1 + EPS = 1 (half of the ULP for 1.0f)
FLT_MIN	1.175494351e-38 // Minimum normalized positive floating-point number
FLT_MAX	3.402823466e+38 // Maximum representable floating-point number
HALF_EPS	4.8828125e-4 // 2^-11, machine epsilon: 1 + EPS = 1 (half of the ULP for 1.0f)
HALF_MIN	6.103515625e-5 /* 2^-14, the same value for 10, 11 and 16-bit: https://www.khronos.org/opengl/wiki/Small_Float_Formats */
HALF_MIN_SQRT	0.0078125 // 2^-7 == sqrt(HALF_MIN), useful for ensuring HALF_MIN after x^2
HALF_MAX	65504.0
UINT_MAX	0xFFFFFFFFu
INT_MAX	0x7FFFFFFF

com.unity.render-pipelines.core/ShaderLibrary/API/GLES2.hlsl

// GLES2 might not have shadow hardware comparison support
#if defined(UNITY_ENABLE_NATIVE_SHADOWS_LOOKUPS)
  #define SHADOW2D_TEXTURE_AND_SAMPLER sampler2DShadow
  #define SHADOWCUBE_TEXTURE_AND_SAMPLER samplerCUBEShadow
  #define SHADOW2D_SAMPLE(textureName, samplerName, coord3) shadow2D(textureName, coord3)
  #define SHADOWCUBE_SAMPLE(textureName, samplerName, coord4) ((texCUBE(textureName,(coord4).xyz) < (coord4).w) ? 0.0 : 1.0)
#else
  // emulate hardware comparison
  #define SHADOW2D_TEXTURE_AND_SAMPLER sampler2D_float
  #define SHADOWCUBE_TEXTURE_AND_SAMPLER samplerCUBE_float
  #define SHADOW2D_SAMPLE(textureName, samplerName, coord3) ((SAMPLE_DEPTH_TEXTURE(textureName, samplerName, (coord3).xy) < (coord3).z) ? 0.0 : 1.0)
  #define SHADOWCUBE_SAMPLE(textureName, samplerName, coord4) ((texCUBE(textureName,(coord4).xyz).r < (coord4).w) ? 0.0 : 1.0)
#endif

纹理相关的宏

纹理类型的宏
宏	D3D11.hlsl	GLCore.hlsl	GLES2.hlsl	GLES3.hlsl	Metal.hlsl	Switch.hlsl	Vulkan.hlsl
TEXTURE2D(textureName)	Texture2D textureName	Texture2D textureName	sampler2D textureName	Texture2D textureName	Texture2D textureName	Texture2D textureName	Texture2D textureName
TEXTURE2D_ARRAY(textureName)	Texture2D Array textureName	Texture2D Array textureName	samplerCUBE textureName /* No support to texture2DArray*/	Texture2D Array textureName	Texture2D Array textureName	Texture2D Array textureName	Texture2D Array textureName
TEXTURECUBE(textureName)	TextureCube textureName	TextureCube textureName	samplerCUBE textureName	TextureCube textureName	TextureCube textureName	TextureCube textureName	TextureCube textureName
TEXTURECUBE_ARRAY(textureName)	TextureCubeArray textureName	TextureCubeArray textureName	samplerCUBE textureName /* No supoport to textureCubeArray and can't emulate with texture2DArray*/	TextureCubeArray textureName	TextureCubeArray textureName	TextureCubeArray textureName	TextureCubeArray textureName
TEXTURE3D(textureName)	Texture3D textureName	Texture3D textureName	sampler3D textureName	Texture3D textureName	Texture3D textureName	Texture3D textureName	Texture3D textureName
TEXTURE2D_FLOAT(textureName)	Texture2D textureName	Texture2D textureName	sampler2D_float textureName	Texture2D textureName	Texture2D textureName	Texture2D textureName	Texture2D textureName
TEXTURE2D_ARRAY_FLOAT(textureName)	Texture2DArray textureName	Texture2DArray textureName	TEXTURECUBE_FLOAT(textureName) /* No support to texture2DArray*/	Texture2DArray textureName	Texture2DArray textureName	Texture2DArray textureName	Texture2DArray textureName
TEXTURECUBE_FLOAT(textureName)	TextureCube textureName	TextureCube textureName	samplerCUBE_float textureName	TextureCube textureName	TextureCube textureName	TextureCube textureName	TextureCube textureName
TEXTURECUBE_ARRAY_FLOAT(textureName)	TextureCubeArray textureName	TextureCubeArray textureName	TEXTURECUBE_FLOAT(textureName) /* No support to texture2DArray*/	TextureCubeArray textureName	TextureCubeArray textureName	TextureCubeArray textureName	TextureCubeArray textureName
TEXTURE3D_FLOAT(textureName)	Texture3D textureName	Texture3D textureName	sampler3D_float textureName	Texture3D textureName	Texture3D textureName	Texture3D textureName	Texture3D textureName
TEXTURE2D_HALF(textureName)	Texture2D textureName	Texture2D textureName	sampler2D_half textureName	Texture2D textureName	Texture2D textureName	Texture2D textureName	Texture2D textureName
TEXTURE2D_ARRAY_HALF(textureName)	Texture2DArray textureName	Texture2DArray textureName	TEXTURECUBE_HALF(textureName) /* No support to texture2DArray*/	Texture2D Array textureName	Texture2DArray textureName	Texture2D Array textureName	Texture2DArray textureName
TEXTURECUBE_HALF(textureName)	TextureCube textureName	TextureCube textureName	samplerCUBE_half textureName	TextureCube textureName	TextureCube textureName	TextureCube textureName	TextureCube textureName
TEXTURECUBE_ARRAY_HALF(textureName)	TextureCubeArray textureName	TextureCubeArray textureName	TEXTURECUBE_HALF(textureName) /* No support to texture2DArray*/	TextureCubeArray textureName	TextureCubeArray textureName	TextureCubeArray textureName	TextureCubeArray textureName
TEXTURE3D_HALF(textureName)	Texture3D textureName	Texture3D textureName	sampler3D_half textureName	Texture3D textureName	Texture3D textureName	Texture3D textureName	Texture3D textureName
SAMPLER(samplerName)	SamplerState samplerName	SamplerState samplerName		SamplerState samplerName	SamplerState samplerName	SamplerState samplerName	SamplerState samplerName
TEXTURE2D_PARAM(textureName, samplerName)	TEXTURE2D(textureName), SAMPLER(samplerName)	TEXTURE2D(textureName), SAMPLER(samplerName)	sampler2D textureName	TEXTURE2D(textureName), SAMPLER(samplerName)	TEXTURE2D(textureName), SAMPLER(samplerName)	TEXTURE2D(textureName), SAMPLER(samplerName)	TEXTURE2D(textureName), SAMPLER(samplerName)
TEXTURE2D_ARRAY_PARAM(textureName, samplerName)	TEXTURE2D_ARRAY(textureName), SAMPLER(samplerName)	TEXTURE2D_ARRAY(textureName), SAMPLER(samplerName)	samplerCUBE textureName	TEXTURE2D_ARRAY(textureName), SAMPLER(samplerName)	TEXTURE2D_ARRAY(textureName), SAMPLER(samplerName)	TEXTURE2D_ARRAY(textureName), SAMPLER(samplerName)	TEXTURE2D_ARRAY(textureName), SAMPLER(samplerName)
PLATFORM_SAMPLE_TEXTURE2D(textureName, samplerName, coord2)	textureName.Sample(samplerName, coord2)	textureName.Sample(samplerName, coord2)	tex2D(textureName, coord2)	textureName.Sample(samplerName, coord2)	textureName.Sample(samplerName, coord2)	textureName.Sample(samplerName, coord2)	textureName.Sample(samplerName, coord2)
PLATFORM_SAMPLE_TEXTURE2D_LOD(textureName, samplerName, coord2, lod)	textureName.SampleLevel(samplerName, coord2, lod)	textureName.SampleLevel(samplerName, coord2, lod)	tex2Dlod(textureName, float4(coord2, 0, lod))	textureName.SampleLevel(samplerName, coord2, lod)	textureName.SampleLevel(samplerName, coord2, lod)	textureName.SampleLevel(samplerName, coord2, lod)	textureName.SampleLevel(samplerName, coord2, lod)
PLATFORM_SAMPLE_TEXTURE2D_BIAS(textureName, samplerName, coord2, bias)	textureName.SampleBias(samplerName, coord2, bias)	textureName.SampleBias(samplerName, coord2, bias)	tex2Dbias(textureName, float4(coord2, 0, bias))	textureName.SampleBias(samplerName, coord2, bias)	textureName.SampleBias(samplerName, coord2, bias)	textureName.SampleBias(samplerName, coord2, bias)	textureName.SampleBias(samplerName, coord2, bias)
PLATFORM_SAMPLE_TEXTURE2D_GRAD(textureName, samplerName, coord2, dpdx, dpdy)	textureName.SampleGrad(samplerName, coord2, dpdx, dpdy)	textureName.SampleGrad(samplerName, coord2, dpdx, dpdy)	PLATFORM_SAMPLE_TEXTURE2D(textureName, samplerName, coord2)	textureName.SampleGrad(samplerName, coord2, dpdx, dpdy)	textureName.SampleGrad(samplerName, coord2, dpdx, dpdy)	textureName.SampleGrad(samplerName, coord2, dpdx, dpdy)	textureName.SampleGrad(samplerName, coord2, dpdx, dpdy)
SAMPLE_TEXTURE2D(textureName, samplerName, coord2)	PLATFORM_SAMPLE_TEXTURE2D(textureName, samplerName, coord2)	PLATFORM_SAMPLE_TEXTURE2D(textureName, samplerName, coord2)	PLATFORM_SAMPLE_TEXTURE2D(textureName, samplerName, coord2)	PLATFORM_SAMPLE_TEXTURE2D(textureName, samplerName, coord2)	PLATFORM_SAMPLE_TEXTURE2D(textureName, samplerName, coord2)	PLATFORM_SAMPLE_TEXTURE2D(textureName, samplerName, coord2)	PLATFORM_SAMPLE_TEXTURE2D(textureName, samplerName, coord2)
SAMPLE_TEXTURE2D_LOD(textureName, samplerName, coord2, lod)	PLATFORM_SAMPLE_TEXTURE2D_LOD(textureName, samplerName, coord2, lod)	PLATFORM_SAMPLE_TEXTURE2D_LOD(textureName, samplerName, coord2, lod)	PLATFORM_SAMPLE_TEXTURE2D_LOD(textureName, samplerName, coord2, lod)	PLATFORM_SAMPLE_TEXTURE2D_LOD(textureName, samplerName, coord2, lod)	PLATFORM_SAMPLE_TEXTURE2D_LOD(textureName, samplerName, coord2, lod)	PLATFORM_SAMPLE_TEXTURE2D_LOD(textureName, samplerName, coord2, lod)	PLATFORM_SAMPLE_TEXTURE2D_LOD(textureName, samplerName, coord2, lod)
SAMPLE_TEXTURE2D_BIAS(textureName, samplerName, coord2, bias)	PLATFORM_SAMPLE_TEXTURE2D_BIAS(textureName, samplerName, coord2, bias)	PLATFORM_SAMPLE_TEXTURE2D_BIAS(textureName, samplerName, coord2, bias)	PLATFORM_SAMPLE_TEXTURE2D_BIAS(textureName, samplerName, coord2, bias)	PLATFORM_SAMPLE_TEXTURE2D_BIAS(textureName, samplerName, coord2, bias)	PLATFORM_SAMPLE_TEXTURE2D_BIAS(textureName, samplerName, coord2, bias)	PLATFORM_SAMPLE_TEXTURE2D_BIAS(textureName, samplerName, coord2, bias)	PLATFORM_SAMPLE_TEXTURE2D_BIAS(textureName, samplerName, coord2, bias)
SAMPLE_TEXTURE2D_GRAD(textureName, samplerName, coord2, dpdx, dpdy)	PLATFORM_SAMPLE_TEXTURE2D_GRAD(textureName, samplerName, coord2, dpdx, dpdy)	PLATFORM_SAMPLE_TEXTURE2D_GRAD(textureName, samplerName, coord2, dpdx, dpdy)	PLATFORM_SAMPLE_TEXTURE2D_GRAD(textureName, samplerName, coord2, dpdx, dpdy)	PLATFORM_SAMPLE_TEXTURE2D_GRAD(textureName, samplerName, coord2, dpdx, dpdy)	PLATFORM_SAMPLE_TEXTURE2D_GRAD(textureName, samplerName, coord2, dpdx, dpdy)	PLATFORM_SAMPLE_TEXTURE2D_GRAD(textureName, samplerName, coord2, dpdx, dpdy)	PLATFORM_SAMPLE_TEXTURE2D_GRAD(textureName, samplerName, coord2, dpdx, dpdy)
SAMPLE_TEXTURE2D_SHADOW(textureName, samplerName, coord3)	textureName.SampleCmpLevelZero(samplerName, (coord3).xy, (coord3).z)	textureName.SampleCmpLevelZero(samplerName, (coord3).xy, (coord3).z)	SHADOW2D_SAMPLE(textureName, samplerName, coord3)	textureName.SampleCmpLevelZero(samplerName, (coord3).xy, (coord3).z)	textureName.SampleCmpLevelZero(samplerName, (coord3).xy, (coord3).z)	textureName.SampleCmpLevelZero(samplerName, (coord3).xy, (coord3).z)	textureName.SampleCmpLevelZero(samplerName, (coord3).xy, (coord3).z)
SAMPLE_DEPTH_TEXTURE(textureName, samplerName, coord2)	SAMPLE_TEXTURE2D(textureName, samplerName, coord2).r	SAMPLE_TEXTURE2D(textureName, samplerName, coord2).r	SAMPLE_TEXTURE2D(textureName, samplerName, coord2).r	SAMPLE_TEXTURE2D(textureName, samplerName, coord2).r	SAMPLE_TEXTURE2D(textureName, samplerName, coord2).r	SAMPLE_TEXTURE2D(textureName, samplerName, coord2).r	SAMPLE_TEXTURE2D(textureName, samplerName, coord2).r
SAMPLE_DEPTH_TEXTURE_LOD(textureName, samplerName, coord2, lod	SAMPLE_TEXTURE2D_LOD(textureName, samplerName, coord2, lod).r	SAMPLE_TEXTURE2D_LOD(textureName, samplerName, coord2, lod).r	SAMPLE_TEXTURE2D_LOD(textureName, samplerName, coord2, lod).r	SAMPLE_TEXTURE2D_LOD(textureName, samplerName, coord2, lod).r	SAMPLE_TEXTURE2D_LOD(textureName, samplerName, coord2, lod).r	SAMPLE_TEXTURE2D_LOD(textureName, samplerName, coord2, lod).r	SAMPLE_TEXTURE2D_LOD(textureName, samplerName, coord2, lod).r
LOAD_TEXTURE2D(textureName, unCoord2	textureName.Load(int3(unCoord2, 0))	textureName.Load(int3(unCoord2, 0))	half4(0, 0, 0, 0)	textureName.Load(int3(unCoord2, 0))	textureName.Load(int3(unCoord2, 0))	textureName.Load(int3(unCoord2, 0))	textureName.Load(int3(unCoord2, 0))