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101 lines
2.9 KiB
101 lines
2.9 KiB
2 years ago
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#ifndef UNITY_STANDARD_SHADOW_INCLUDED
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#define UNITY_STANDARD_SHADOW_INCLUDED
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// NOTE: had to split shadow functions into separate file,
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// otherwise compiler gives trouble with LIGHTING_COORDS macro (in UnityStandardCore.cginc)
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#include "UnityCG.cginc"
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#include "UnityShaderVariables.cginc"
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#include "UnityStandardConfig.cginc"
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// Do dithering for alpha blended shadows on SM3+/desktop;
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// on lesser systems do simple alpha-tested shadows
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#if defined(_ALPHABLEND_ON) && !((SHADER_TARGET < 30) || defined (SHADER_API_MOBILE) || defined(SHADER_API_D3D11_9X) || defined (SHADER_API_PSP2) || defined (SHADER_API_PSM))
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#define UNITY_STANDARD_USE_DITHER_MASK 1
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#endif
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// Need to output UVs in shadow caster, since we need to sample texture and do clip/dithering based on it
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#if defined(_ALPHATEST_ON) || defined(_ALPHABLEND_ON)
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#define UNITY_STANDARD_USE_SHADOW_UVS 1
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#endif
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// Has a non-empty shadow caster output struct (it's an error to have empty structs on some platforms...)
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#if !defined(V2F_SHADOW_CASTER_NOPOS_IS_EMPTY) || defined(UNITY_STANDARD_USE_SHADOW_UVS)
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#define UNITY_STANDARD_USE_SHADOW_OUTPUT_STRUCT 1
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#endif
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half4 _Color;
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half _Cutoff2;
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sampler2D _MainTex;
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float4 _MainTex_ST;
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#ifdef UNITY_STANDARD_USE_DITHER_MASK
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sampler3D _DitherMaskLOD;
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#endif
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struct VertexInput
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{
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float4 vertex : POSITION;
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float3 normal : NORMAL;
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float2 uv0 : TEXCOORD0;
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};
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#ifdef UNITY_STANDARD_USE_SHADOW_OUTPUT_STRUCT
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struct VertexOutputShadowCaster
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{
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V2F_SHADOW_CASTER_NOPOS
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#if defined(UNITY_STANDARD_USE_SHADOW_UVS)
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float2 tex : TEXCOORD1;
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#endif
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};
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#endif
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// We have to do these dances of outputting SV_POSITION separately from the vertex shader,
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// and inputting VPOS in the pixel shader, since they both map to "POSITION" semantic on
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// some platforms, and then things don't go well.
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void vertShadowCaster (VertexInput v,
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#ifdef UNITY_STANDARD_USE_SHADOW_OUTPUT_STRUCT
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out VertexOutputShadowCaster o,
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#endif
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out float4 opos : SV_POSITION)
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{
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TRANSFER_SHADOW_CASTER_NOPOS(o, opos)
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#if defined(UNITY_STANDARD_USE_SHADOW_UVS)
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o.tex = TRANSFORM_TEX(v.uv0, _MainTex);
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#endif
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}
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half4 fragShadowCaster (
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#ifdef UNITY_STANDARD_USE_SHADOW_OUTPUT_STRUCT
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VertexOutputShadowCaster i
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#endif
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#ifdef UNITY_STANDARD_USE_DITHER_MASK
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, UNITY_VPOS_TYPE vpos : VPOS
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#endif
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) : SV_Target
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{
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#if defined(UNITY_STANDARD_USE_SHADOW_UVS)
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half alpha = tex2D(_MainTex, i.tex).a;
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half alphaTest = _Cutoff2 * 0.5;
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clip (alpha - alphaTest);
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#if defined(_ALPHABLEND_ON)
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#ifdef UNITY_STANDARD_USE_DITHER_MASK
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// Use dither mask for alpha blended shadows, based on pixel position xy
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// and alpha level. Our dither texture is 4x4x16.
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half alphaRef = tex3D(_DitherMaskLOD, float3(vpos.xy*0.25,alpha*_Color.a*0.9375)).a;
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clip (alphaRef - alphaTest);
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#endif // #ifdef UNITY_STANDARD_USE_DITHER_MASK
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#endif // #if defined(_ALPHABLEND_ON)
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#endif // #if defined(UNITY_STANDARD_USE_SHADOW_UVS)
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SHADOW_CASTER_FRAGMENT(i)
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}
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#endif // UNITY_STANDARD_SHADOW_INCLUDED
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