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94 lines
2.1 KiB
94 lines
2.1 KiB
//Upgrade NOTE: replaced 'mul(UNITY_MATRIX_MVP,*)' with 'UnityObjectToClipPos(*)'
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Shader "Conversion/CubemapToEquirectangularGnomic" {
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Properties{
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_MainTex("Cubemap (RGB)", CUBE) = "" {}
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_EquiRotation("Rotation X", Float) = 1.0
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_EquiRotationY("Rotation Y", Float) = 1.0
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_FOVScale_X("FOV X", Float) = 0.45
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_FOVScale_Y("FOV Y", Float) = 0.1
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}
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Subshader{
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Pass {
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ZTest Always Cull Off ZWrite Off
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Fog { Mode off }
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CGPROGRAM
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#pragma vertex vert
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#pragma fragment frag
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#pragma fragmentoption ARB_precision_hint_fastest
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#include "UnityCG.cginc"
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#define PI 3.141592653589793
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#define TWOPI 6.283185307179587
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#define PI_2 1.570796326794897
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struct v2f {
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float4 pos : POSITION;
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float2 uv : TEXCOORD0;
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};
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samplerCUBE _MainTex;
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float _EquiRotation;
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float _EquiRotationY;
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float _FOVScale_X;
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float _FOVScale_Y;
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v2f vert(appdata_img v)
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{
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v2f o;
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o.pos = UnityObjectToClipPos(v.vertex);
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o.uv = v.texcoord.xy;
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return o;
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}
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fixed4 frag(v2f i) : COLOR
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{
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float2 q = i.uv;
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float2 cp = (float2(PI + _EquiRotation,PI_2) * 2.0 - 1.0) * float2(PI, PI_2); // [-PI, PI], [-PI_2, PI_2]
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// Convert screen coord in gnomonic mapping to spherical coord in [PI/2, PI]
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float2 convertedScreenCoord = (q.xy * 2.0 - 1.0) * float2(_FOVScale_X, _FOVScale_Y) * float2(PI, PI_2);
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float x = convertedScreenCoord.x;
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float y = convertedScreenCoord.y;
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float rou = sqrt(x * x + y * y);
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float c = atan(rou);
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float sin_c = sin( c );
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float cos_c = cos( c );
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float lat = asin(cos_c * sin(cp.y) + (y * sin_c * cos(cp.y)) / rou);
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float lon = cp.x + atan2(x * sin_c, rou * cos(cp.y) * cos_c - y * sin(cp.y) * sin_c);
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lat = (lat / PI_2 + 1.0) * 1.0;
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lon = (lon / PI + 1.0) * 0.5; //[0, 1]
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float2 final = float2(lon, lat) * float2(TWOPI, PI);
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final.x = final.x;
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final.y = final.y + _EquiRotationY;
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float3 unit = float3(0,0,0);
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unit.x = sin(final.y) * sin(final.x) * -1;
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unit.y = cos(final.y * -1);
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unit.z = sin(final.y) * cos(final.x) * -1;
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return texCUBE(_MainTex, unit);
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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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