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170 lines
11 KiB
170 lines
11 KiB
2 years ago
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// Upgrade NOTE: replaced 'mul(UNITY_MATRIX_MVP,*)' with 'UnityObjectToClipPos(*)'
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#ifndef MARMO_CONVOLVE_CGINC
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#define MARMO_CONVOLVE_CGINC
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uniform samplerCUBE _CubeHDR;
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uniform float _SpecularScale;
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uniform float _SpecularExp;
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uniform float _ImportantLog;
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//{ r1, r2, cos( 2*pi*r2 ), sin( 2*pi*r2 ) }
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uniform float4
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_PhongRands0, _PhongRands1, _PhongRands2, _PhongRands3,
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_PhongRands4, _PhongRands5, _PhongRands6, _PhongRands7,
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_PhongRands8, _PhongRands9, _PhongRands10, _PhongRands11,
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_PhongRands12, _PhongRands13, _PhongRands14, _PhongRands15,
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_PhongRands16, _PhongRands17, _PhongRands18, _PhongRands19,
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_PhongRands20, _PhongRands21, _PhongRands22, _PhongRands23,
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_PhongRands24, _PhongRands25, _PhongRands26, _PhongRands27,
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_PhongRands28, _PhongRands29, _PhongRands30, _PhongRands31;
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#if SPECULAR_IMPORTANCE_SAMPLES>32
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uniform float4
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_PhongRands32, _PhongRands33, _PhongRands34, _PhongRands35,
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_PhongRands36, _PhongRands37, _PhongRands38, _PhongRands39,
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_PhongRands40, _PhongRands41, _PhongRands42, _PhongRands43,
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_PhongRands44, _PhongRands45, _PhongRands46, _PhongRands47,
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_PhongRands48, _PhongRands49, _PhongRands50, _PhongRands51,
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_PhongRands52, _PhongRands53, _PhongRands54, _PhongRands55,
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_PhongRands56, _PhongRands57, _PhongRands58, _PhongRands59,
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_PhongRands60, _PhongRands61, _PhongRands62, _PhongRands63;
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#endif
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#if SPECULAR_IMPORTANCE_SAMPLES>64
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uniform float4
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_PhongRands64, _PhongRands65, _PhongRands66, _PhongRands67,
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_PhongRands68, _PhongRands69, _PhongRands70, _PhongRands71,
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_PhongRands72, _PhongRands73, _PhongRands74, _PhongRands75,
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_PhongRands76, _PhongRands77, _PhongRands78, _PhongRands79,
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_PhongRands80, _PhongRands81, _PhongRands82, _PhongRands83,
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_PhongRands84, _PhongRands85, _PhongRands86, _PhongRands87,
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_PhongRands88, _PhongRands89, _PhongRands90, _PhongRands91,
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_PhongRands92, _PhongRands93, _PhongRands94, _PhongRands95,
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_PhongRands96, _PhongRands97, _PhongRands98, _PhongRands99,
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_PhongRands100, _PhongRands101, _PhongRands102, _PhongRands103,
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_PhongRands104, _PhongRands105, _PhongRands106, _PhongRands107,
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_PhongRands108, _PhongRands109, _PhongRands110, _PhongRands111,
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_PhongRands112, _PhongRands113, _PhongRands114, _PhongRands115,
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_PhongRands116, _PhongRands117, _PhongRands118, _PhongRands119,
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_PhongRands120, _PhongRands121, _PhongRands122, _PhongRands123,
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_PhongRands124, _PhongRands125, _PhongRands126, _PhongRands127;
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#endif
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//Forces gamma-space rendering to still return linear values from sRGB textures.
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//Call on textures that do NOT bypass sRGB sampling.
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half4 forceLinear3(half4 c) {
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c.rgb = lerp(sRGBToLinear3(c.rgb), c.rgb, IS_LINEAR);
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return c;
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}
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//returns a random hemisphere vector, with probabilty weighted to a pow() lobe of 'specExp'
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float3 phongImportanceSample( float4 r, float specExp )
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{
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float cos_theta = pow( r.x, 1.0 / (specExp + 1.0) );
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float sin_theta = sqrt( 1.0 - cos_theta*cos_theta );
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float cos_phi = r.z;
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float sin_phi = r.w;
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return float3( cos_phi*sin_theta, sin_phi*sin_theta, cos_theta );
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}
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float3 importanceLookup( float3 r, float3 x, float3 y, float3 z, float4 rand ){
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float3 dir = phongImportanceSample(rand, _SpecularExp);
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float3 localDir = dir.x*x + dir.y*y + dir.z*z;
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float pdf = (_SpecularExp + 1.0)/(2.0 * 3.14159) * pow( saturate( dot(localDir,r) ), _SpecularExp );
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float lod = _ImportantLog - 0.5*log2( pdf );
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float4 lookup;
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lookup.xyz = localDir;//reflect( -s.vertexEye, localDir );
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lookup.w = lod;
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float4 result = texCUBElod(_CubeHDR, lookup);
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//importance sampling always happens in linear space
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#if MARMO_RGBM_INPUT_ON
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result = forceLinear3(result);
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result.rgb *= pow(result.a*6.0, 2.2);
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#endif
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return (1.0/float(SPECULAR_IMPORTANCE_SAMPLES)) * result.rgb;
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}
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struct appdata_t {
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float4 vertex : POSITION;
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float3 texcoord : TEXCOORD0;
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};
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struct v2f {
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float4 vertex : POSITION;
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float3 texcoord : TEXCOORD0;
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};
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v2f convolveVert (appdata_t v) {
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v2f o;
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o.vertex = UnityObjectToClipPos(v.vertex);
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o.texcoord = v.texcoord;
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return o;
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}
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half4 convolveFrag (v2f i) : COLOR {
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float3 n = normalize(mulVec3(_SkyMatrix, normalize(i.texcoord)));
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//sample the reflection map repeatedly, with an importance-based sample distribution
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float3 bx = normalize(cross(n,float3(0.0, 1.0, saturate(n.y*10000.0 - 9999.0))));
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float3 by = normalize(cross(bx,n));
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float3 bz = normalize(n);
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float3 spec = float3(0.0,0.0,0.0);
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spec =
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importanceLookup(n, bx, by, bz, _PhongRands0) + importanceLookup(n, bx, by, bz, _PhongRands1) + importanceLookup(n, bx, by, bz, _PhongRands2) + importanceLookup(n, bx, by, bz, _PhongRands3) +
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importanceLookup(n, bx, by, bz, _PhongRands4) + importanceLookup(n, bx, by, bz, _PhongRands5) + importanceLookup(n, bx, by, bz, _PhongRands6) + importanceLookup(n, bx, by, bz, _PhongRands7) +
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importanceLookup(n, bx, by, bz, _PhongRands8) + importanceLookup(n, bx, by, bz, _PhongRands9) + importanceLookup(n, bx, by, bz, _PhongRands10) + importanceLookup(n, bx, by, bz, _PhongRands11) +
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importanceLookup(n, bx, by, bz, _PhongRands12) + importanceLookup(n, bx, by, bz, _PhongRands13) + importanceLookup(n, bx, by, bz, _PhongRands14) + importanceLookup(n, bx, by, bz, _PhongRands15) +
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importanceLookup(n, bx, by, bz, _PhongRands16) + importanceLookup(n, bx, by, bz, _PhongRands17) + importanceLookup(n, bx, by, bz, _PhongRands18) + importanceLookup(n, bx, by, bz, _PhongRands19) +
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importanceLookup(n, bx, by, bz, _PhongRands20) + importanceLookup(n, bx, by, bz, _PhongRands21) + importanceLookup(n, bx, by, bz, _PhongRands22) + importanceLookup(n, bx, by, bz, _PhongRands23) +
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importanceLookup(n, bx, by, bz, _PhongRands24) + importanceLookup(n, bx, by, bz, _PhongRands25) + importanceLookup(n, bx, by, bz, _PhongRands26) + importanceLookup(n, bx, by, bz, _PhongRands27) +
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importanceLookup(n, bx, by, bz, _PhongRands28) + importanceLookup(n, bx, by, bz, _PhongRands29) + importanceLookup(n, bx, by, bz, _PhongRands30) + importanceLookup(n, bx, by, bz, _PhongRands31);
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#if SPECULAR_IMPORTANCE_SAMPLES>32
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spec +=
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importanceLookup(n, bx, by, bz, _PhongRands32) + importanceLookup(n, bx, by, bz, _PhongRands33) + importanceLookup(n, bx, by, bz, _PhongRands34) + importanceLookup(n, bx, by, bz, _PhongRands35) +
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importanceLookup(n, bx, by, bz, _PhongRands36) + importanceLookup(n, bx, by, bz, _PhongRands37) + importanceLookup(n, bx, by, bz, _PhongRands38) + importanceLookup(n, bx, by, bz, _PhongRands39) +
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importanceLookup(n, bx, by, bz, _PhongRands40) + importanceLookup(n, bx, by, bz, _PhongRands41) + importanceLookup(n, bx, by, bz, _PhongRands42) + importanceLookup(n, bx, by, bz, _PhongRands43) +
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importanceLookup(n, bx, by, bz, _PhongRands44) + importanceLookup(n, bx, by, bz, _PhongRands45) + importanceLookup(n, bx, by, bz, _PhongRands46) + importanceLookup(n, bx, by, bz, _PhongRands47) +
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importanceLookup(n, bx, by, bz, _PhongRands48) + importanceLookup(n, bx, by, bz, _PhongRands49) + importanceLookup(n, bx, by, bz, _PhongRands50) + importanceLookup(n, bx, by, bz, _PhongRands51) +
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importanceLookup(n, bx, by, bz, _PhongRands52) + importanceLookup(n, bx, by, bz, _PhongRands53) + importanceLookup(n, bx, by, bz, _PhongRands54) + importanceLookup(n, bx, by, bz, _PhongRands55) +
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importanceLookup(n, bx, by, bz, _PhongRands56) + importanceLookup(n, bx, by, bz, _PhongRands57) + importanceLookup(n, bx, by, bz, _PhongRands58) + importanceLookup(n, bx, by, bz, _PhongRands59) +
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importanceLookup(n, bx, by, bz, _PhongRands60) + importanceLookup(n, bx, by, bz, _PhongRands61) + importanceLookup(n, bx, by, bz, _PhongRands62) + importanceLookup(n, bx, by, bz, _PhongRands63);
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#endif
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#if SPECULAR_IMPORTANCE_SAMPLES>64
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spec +=
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importanceLookup(n, bx, by, bz, _PhongRands64) + importanceLookup(n, bx, by, bz, _PhongRands65) + importanceLookup(n, bx, by, bz, _PhongRands66) + importanceLookup(n, bx, by, bz, _PhongRands67) +
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importanceLookup(n, bx, by, bz, _PhongRands68) + importanceLookup(n, bx, by, bz, _PhongRands69) + importanceLookup(n, bx, by, bz, _PhongRands70) + importanceLookup(n, bx, by, bz, _PhongRands71) +
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importanceLookup(n, bx, by, bz, _PhongRands72) + importanceLookup(n, bx, by, bz, _PhongRands73) + importanceLookup(n, bx, by, bz, _PhongRands74) + importanceLookup(n, bx, by, bz, _PhongRands75) +
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importanceLookup(n, bx, by, bz, _PhongRands76) + importanceLookup(n, bx, by, bz, _PhongRands77) + importanceLookup(n, bx, by, bz, _PhongRands78) + importanceLookup(n, bx, by, bz, _PhongRands79) +
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importanceLookup(n, bx, by, bz, _PhongRands80) + importanceLookup(n, bx, by, bz, _PhongRands81) + importanceLookup(n, bx, by, bz, _PhongRands82) + importanceLookup(n, bx, by, bz, _PhongRands83) +
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importanceLookup(n, bx, by, bz, _PhongRands84) + importanceLookup(n, bx, by, bz, _PhongRands85) + importanceLookup(n, bx, by, bz, _PhongRands86) + importanceLookup(n, bx, by, bz, _PhongRands87) +
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importanceLookup(n, bx, by, bz, _PhongRands88) + importanceLookup(n, bx, by, bz, _PhongRands89) + importanceLookup(n, bx, by, bz, _PhongRands90) + importanceLookup(n, bx, by, bz, _PhongRands91) +
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importanceLookup(n, bx, by, bz, _PhongRands92) + importanceLookup(n, bx, by, bz, _PhongRands93) + importanceLookup(n, bx, by, bz, _PhongRands94) + importanceLookup(n, bx, by, bz, _PhongRands95) +
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importanceLookup(n, bx, by, bz, _PhongRands96) + importanceLookup(n, bx, by, bz, _PhongRands97) + importanceLookup(n, bx, by, bz, _PhongRands98) + importanceLookup(n, bx, by, bz, _PhongRands99) +
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importanceLookup(n, bx, by, bz, _PhongRands100) + importanceLookup(n, bx, by, bz, _PhongRands101) + importanceLookup(n, bx, by, bz, _PhongRands102) + importanceLookup(n, bx, by, bz, _PhongRands103) +
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importanceLookup(n, bx, by, bz, _PhongRands104) + importanceLookup(n, bx, by, bz, _PhongRands105) + importanceLookup(n, bx, by, bz, _PhongRands106) + importanceLookup(n, bx, by, bz, _PhongRands107) +
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importanceLookup(n, bx, by, bz, _PhongRands108) + importanceLookup(n, bx, by, bz, _PhongRands109) + importanceLookup(n, bx, by, bz, _PhongRands110) + importanceLookup(n, bx, by, bz, _PhongRands111) +
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importanceLookup(n, bx, by, bz, _PhongRands112) + importanceLookup(n, bx, by, bz, _PhongRands113) + importanceLookup(n, bx, by, bz, _PhongRands114) + importanceLookup(n, bx, by, bz, _PhongRands115) +
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importanceLookup(n, bx, by, bz, _PhongRands116) + importanceLookup(n, bx, by, bz, _PhongRands117) + importanceLookup(n, bx, by, bz, _PhongRands118) + importanceLookup(n, bx, by, bz, _PhongRands119) +
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importanceLookup(n, bx, by, bz, _PhongRands120) + importanceLookup(n, bx, by, bz, _PhongRands121) + importanceLookup(n, bx, by, bz, _PhongRands122) + importanceLookup(n, bx, by, bz, _PhongRands123) +
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importanceLookup(n, bx, by, bz, _PhongRands124) + importanceLookup(n, bx, by, bz, _PhongRands125) + importanceLookup(n, bx, by, bz, _PhongRands126) + importanceLookup(n, bx, by, bz, _PhongRands127);
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#endif
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float4 result = float4(0.0,0.0,0.0,1.0);
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result.rgb = spec * _SpecularScale;
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#if MARMO_RGBM_OUTPUT_ON
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result = HDRtoRGBM(result);
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//output gets converted to sRGB by gamma correction, premptively undo it
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result.rgb = lerp(result.rgb, sRGBToLinear3(result.rgb), IS_LINEAR);
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return result;
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#else
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result.a = 1.0;
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#endif
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return result;
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}
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#endif
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