305 lines
6.8 KiB
GLSL
305 lines
6.8 KiB
GLSL
Shader "Hidden/CubeBlur" {
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Properties {
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_MainTex ("Main", CUBE) = "" {}
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_Texel ("Texel", Float) = 0.0078125
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_Level ("Level", Float) = 0.
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_Scale ("Scale", Float) = 1.
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}
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CGINCLUDE
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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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#include "HLSLSupport.cginc"
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struct v2f {
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half4 pos : SV_POSITION;
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half4 uvw : TEXCOORD0;
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};
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v2f vert(appdata_base 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.uvw = v.texcoord;
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return o;
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}
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UNITY_DECLARE_TEXCUBE(_MainTex);
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#define UNITY_SAMPLE_TEXCUBE_LOD_CLAMPED(tex, dir, lod) max(half4(0.0, 0.0, 0.0, 0.0), UNITY_SAMPLE_TEXCUBE_LOD(tex, dir, lod))
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half _Texel;
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half _Radius;
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half _Level;
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half _Scale;
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#define zero half3(0., 0., 0.)
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#define one half3(1., 1., 1.)
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#define two half3(2., 2., 2.)
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half3 fold(half3 st, half3 face)
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{
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half3 c = min(max(st, -one), one);
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half3 f = abs(st - c);
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half m = max(max(f.x, f.y), f.z);
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return c - m*face;
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}
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half3 gauss(half d)
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{
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// compute coefficients for positions .5*d/.5, 1.5*d/.5 and 2.5*d/.5
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// this assumes a sigma of .5 for a density of 1.
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half3 v = half3(d, 3.*d, 5.*d)*_Scale;
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return exp(-v*v);
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}
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half4 frag(v2f i) : SV_Target
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{
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#if (SHADER_TARGET < 30 || SHADER_API_GLES)
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return UNITY_SAMPLE_TEXCUBE_LOD(_MainTex, i.uvw.xyz, _Level);
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#else
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half3 st;
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half3 face = lerp(zero, i.uvw.xyz, abs(i.uvw.xyz)==one);
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half3 u = face.zxy*_Texel;
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half3 v = face.yzx*_Texel;
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half4 s = half4(i.uvw.xyz*(one - abs(face)), 0.);
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// modulate coefficients based on position (texel density on projected sphere)
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half w = 1. / sqrt(1. + dot(s.xyz, s.xyz));
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half3 C = gauss(w*w*w);
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half4 s1, s2, s3;
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half3 c;
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half3 up1 = fold(i.uvw.xyz + 1.5*u, face);
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half3 um1 = fold(i.uvw.xyz - 1.5*u, face);
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half3 up2 = fold(i.uvw.xyz + 2.5*u, face);
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half3 um2 = fold(i.uvw.xyz - 2.5*u, face);
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half3 vp1 = fold(i.uvw.xyz + 1.5*v, face);
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half3 vm1 = fold(i.uvw.xyz - 1.5*v, face);
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half3 vp2 = fold(i.uvw.xyz + 2.5*v, face);
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half3 vm2 = fold(i.uvw.xyz - 2.5*v, face);
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s = 0.;
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w = 0.;
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// first row
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c = C.xyz*C.zzz;
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st = i.uvw.xyz - 2.5*u - 2.5*v;
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st = fold(st, face);
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s3 = UNITY_SAMPLE_TEXCUBE_LOD_CLAMPED(_MainTex, st, _Level);
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st = i.uvw.xyz - 1.5*u - 2.5*v;
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st = fold(st, face);
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s2 = UNITY_SAMPLE_TEXCUBE_LOD_CLAMPED(_MainTex, st, _Level);
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st = vm2 - .5*u;
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s1 = UNITY_SAMPLE_TEXCUBE_LOD_CLAMPED(_MainTex, st, _Level);
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st = vm2 + .5*u;
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s1 += UNITY_SAMPLE_TEXCUBE_LOD_CLAMPED(_MainTex, st, _Level);
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st = i.uvw.xyz + 1.5*u - 2.5*v;
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st = fold(st, face);
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s2 += UNITY_SAMPLE_TEXCUBE_LOD_CLAMPED(_MainTex, st, _Level);
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st = i.uvw.xyz + 2.5*u - 2.5*v;
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st = fold(st, face);
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s3 += UNITY_SAMPLE_TEXCUBE_LOD_CLAMPED(_MainTex, st, _Level);
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w += dot(c, two);
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s1 = c.x*s1 + c.y*s2;
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s += c.z*s3;
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s += s1;
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// second row
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c = C.xyz*C.yyy;
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st = i.uvw.xyz + 2.5*u - 1.5*v;
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st = fold(st, face);
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s3 = UNITY_SAMPLE_TEXCUBE_LOD_CLAMPED(_MainTex, st, _Level);
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st = i.uvw.xyz + 1.5*u - 1.5*v;
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st = fold(st, face);
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s2 = UNITY_SAMPLE_TEXCUBE_LOD_CLAMPED(_MainTex, st, _Level);
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st = vm1 + .5*u;
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s1 = UNITY_SAMPLE_TEXCUBE_LOD_CLAMPED(_MainTex, st, _Level);
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st = vm1 - .5*u;
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s1 += UNITY_SAMPLE_TEXCUBE_LOD_CLAMPED(_MainTex, st, _Level);
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st = i.uvw.xyz - 1.5*u - 1.5*v;
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st = fold(st, face);
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s2 += UNITY_SAMPLE_TEXCUBE_LOD_CLAMPED(_MainTex, st, _Level);
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st = i.uvw.xyz - 2.5*u - 1.5*v;
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st = fold(st, face);
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s3 += UNITY_SAMPLE_TEXCUBE_LOD_CLAMPED(_MainTex, st, _Level);
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w += dot(c, two);
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s1 = c.x*s1 + c.y*s2;
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s += c.z*s3;
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s += s1;
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// third row
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c = C.xyz*C.xxx;
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st = um2 - .5*v;
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s3 = UNITY_SAMPLE_TEXCUBE_LOD_CLAMPED(_MainTex, st, _Level);
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st = um1 - .5*v;
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s2 = UNITY_SAMPLE_TEXCUBE_LOD_CLAMPED(_MainTex, st, _Level);
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st = i.uvw.xyz - .5*u - .5*v;
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s1 = UNITY_SAMPLE_TEXCUBE_LOD_CLAMPED(_MainTex, st, _Level);
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st = i.uvw.xyz + .5*u - .5*v;
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s1 += UNITY_SAMPLE_TEXCUBE_LOD_CLAMPED(_MainTex, st, _Level);
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st = up1 - .5*v;
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s2 += UNITY_SAMPLE_TEXCUBE_LOD_CLAMPED(_MainTex, st, _Level);
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st = up2 - .5*v;
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s3 += UNITY_SAMPLE_TEXCUBE_LOD_CLAMPED(_MainTex, st, _Level);
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w += dot(c, two);
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s1 = c.x*s1 + c.y*s2;
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s += c.z*s3;
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s += s1;
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// fourth row
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c = C.xyz*C.xxx;
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st = up2 + .5*v;
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s3 = UNITY_SAMPLE_TEXCUBE_LOD_CLAMPED(_MainTex, st, _Level);
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st = up1 + .5*v;
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s2 = UNITY_SAMPLE_TEXCUBE_LOD_CLAMPED(_MainTex, st, _Level);
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st = i.uvw.xyz + .5*u + .5*v;
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s1 = UNITY_SAMPLE_TEXCUBE_LOD_CLAMPED(_MainTex, st, _Level);
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st = i.uvw.xyz - .5*u + .5*v;
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s1 += UNITY_SAMPLE_TEXCUBE_LOD_CLAMPED(_MainTex, st, _Level);
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st = um1 + .5*v;
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s2 += UNITY_SAMPLE_TEXCUBE_LOD_CLAMPED(_MainTex, st, _Level);
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st = um2 + .5*v;
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s3 += UNITY_SAMPLE_TEXCUBE_LOD_CLAMPED(_MainTex, st, _Level);
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w += dot(c, two);
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s1 = c.x*s1 + c.y*s2;
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s += c.z*s3;
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s += s1;
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// fifth row
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c = C.xyz*C.yyy;
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st = i.uvw.xyz - 2.5*u + 1.5*v;
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st = fold(st, face);
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s3 = UNITY_SAMPLE_TEXCUBE_LOD_CLAMPED(_MainTex, st, _Level);
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st = i.uvw.xyz - 1.5*u + 1.5*v;
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st = fold(st, face);
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s2 = UNITY_SAMPLE_TEXCUBE_LOD_CLAMPED(_MainTex, st, _Level);
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st = vp1 - .5*u;
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s1 = UNITY_SAMPLE_TEXCUBE_LOD_CLAMPED(_MainTex, st, _Level);
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st = vp1 + .5*u;
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s1 += UNITY_SAMPLE_TEXCUBE_LOD_CLAMPED(_MainTex, st, _Level);
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st = i.uvw.xyz + 1.5*u + 1.5*v;
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st = fold(st, face);
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s2 += UNITY_SAMPLE_TEXCUBE_LOD_CLAMPED(_MainTex, st, _Level);
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st = i.uvw.xyz + 2.5*u + 1.5*v;
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st = fold(st, face);
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s3 += UNITY_SAMPLE_TEXCUBE_LOD_CLAMPED(_MainTex, st, _Level);
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w += dot(c, two);
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s1 = c.x*s1 + c.y*s2;
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s += c.z*s3;
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s += s1;
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// sixth row
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c = C.xyz*C.zzz;
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st = i.uvw.xyz + 2.5*u + 2.5*v;
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st = fold(st, face);
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s3 = UNITY_SAMPLE_TEXCUBE_LOD_CLAMPED(_MainTex, st, _Level);
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st = i.uvw.xyz + 1.5*u + 2.5*v;
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st = fold(st, face);
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s2 = UNITY_SAMPLE_TEXCUBE_LOD_CLAMPED(_MainTex, st, _Level);
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st = vp2 + .5*u;
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s1 = UNITY_SAMPLE_TEXCUBE_LOD_CLAMPED(_MainTex, st, _Level);
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st = vp2 - .5*u;
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s1 += UNITY_SAMPLE_TEXCUBE_LOD_CLAMPED(_MainTex, st, _Level);
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st = i.uvw.xyz - 1.5*u + 2.5*v;
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st = fold(st, face);
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s2 += UNITY_SAMPLE_TEXCUBE_LOD_CLAMPED(_MainTex, st, _Level);
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st = i.uvw.xyz - 2.5*u + 2.5*v;
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st = fold(st, face);
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s3 += UNITY_SAMPLE_TEXCUBE_LOD_CLAMPED(_MainTex, st, _Level);
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w += dot(c, two);
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s1 = c.x*s1 + c.y*s2;
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s += c.z*s3;
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s += s1;
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return s/w;
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#endif
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}
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ENDCG
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SubShader {
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Tags { "RenderType"="Opaque" }
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LOD 200
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Pass {
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ZTest Always
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Blend Off
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AlphaTest off
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Cull Off
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ZWrite Off
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Fog { Mode off }
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CGPROGRAM
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#pragma target 3.0
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ENDCG
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}
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}
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SubShader {
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Tags { "RenderType"="Opaque" }
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LOD 200
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Pass {
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ZTest Always
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Blend Off
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AlphaTest off
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Cull Off
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ZWrite Off
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Fog { Mode off }
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CGPROGRAM
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#pragma target 2.0
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ENDCG
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}
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}
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}
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