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80 行
1.6 KiB
80 行
1.6 KiB
Shader "Hidden/CubeToPano" {
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Properties {
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_SrcBlend ("", Float) = 1
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_DstBlend ("", Float) = 1
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}
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SubShader {
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Pass
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{
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ZWrite Off
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ZTest Always
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Cull Off
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Blend Off
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CGPROGRAM
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#pragma target 4.5
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#pragma vertex vert
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#pragma fragment frag
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#include "UnityCG.cginc"
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UNITY_DECLARE_TEXCUBE(_srcCubeTexture);
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uniform int _cubeMipLvl;
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struct v2f {
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float4 vertex : SV_POSITION;
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float2 texcoord : TEXCOORD0;
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};
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v2f vert (float4 vertex : POSITION, float2 texcoord : TEXCOORD0)
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{
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v2f o;
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o.vertex = UnityObjectToClipPos(vertex);
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o.texcoord = texcoord.xy;
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return o;
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}
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half2 DirectionToSphericalTexCoordinate(half3 dir) // use this for the lookup
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{
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// coordinate frame is (-Z,X) meaning negative Z is primary axis and X is secondary axis.
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float recipPi = 1.0/3.1415926535897932384626433832795;
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return half2( 1.0-0.5*recipPi*atan2(dir.x, -dir.z), asin(dir.y)*recipPi+0.5 );
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}
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half3 SphericalTexCoordinateToDirection(half2 sphTexCoord)
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{
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float pi = 3.1415926535897932384626433832795;
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float theta = (1-sphTexCoord.x) * (pi*2);
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float phi = (sphTexCoord.y-0.5) * pi;
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float csTh, siTh, csPh, siPh;
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sincos(theta, siTh, csTh);
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sincos(phi, siPh, csPh);
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// theta is 0 at negative Z (backwards). Coordinate frame is (-Z,X) meaning negative Z is primary axis and X is secondary axis.
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return float3(siTh*csPh, siPh, -csTh*csPh);
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}
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half4 frag (v2f i) : SV_Target
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{
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uint2 pixCoord = ((uint2) i.vertex.xy);
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half3 dir = SphericalTexCoordinateToDirection(i.texcoord.xy);
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half3 res = UNITY_SAMPLE_TEXCUBE_LOD(_srcCubeTexture, dir, (float) _cubeMipLvl).xyz;
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return half4(res,1.0);
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}
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ENDCG
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}
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}
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Fallback Off
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}
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