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Manually unroll rh shader

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Vlj 2014-08-14 23:58:11 +02:00
parent 07bff38427
commit 4829b8ddd8
1 changed files with 40 additions and 35 deletions
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45
data/shaders/rh.frag
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@ -32,26 +32,10 @@ vec4 DirToSh(vec3 dir, float flux)
return SHBasis (dir) * flux;
}
void main(void)
void loop(in int i,
in vec3 RHcenter,in vec3 RHCellSize, in vec2 RHuv, in float RHdepth,
inout vec4 SHr, inout vec4 SHg, inout vec4 SHb)
{
vec3 normalizedRHCenter = 2. * vec3(gl_FragCoord.xy, slice) / resolution - 1.;
vec3 RHcenter = (RHMatrix * vec4(normalizedRHCenter * extents, 1.)).xyz;
vec4 ShadowProjectedRH = RSMMatrix * vec4(RHcenter, 1.);
vec3 RHCellSize = extents / resolution;
vec2 RHuv = .5 * ShadowProjectedRH.xy / ShadowProjectedRH.w + .5;
float RHdepth = .5 * ShadowProjectedRH.z / ShadowProjectedRH.w + .5;
vec4 SHr = vec4(0.);
vec4 SHg = vec4(0.);
vec4 SHb = vec4(0.);
int x = int(gl_FragCoord.x), y = int(gl_FragCoord.y);
float phi = 30. * (x ^ y) + 10. * x * y;
for (int i = 0; i < SAMPLES; i++)
{
// produce a new sample location on the RSM texture
float alpha = (i + .5) / SAMPLES;
float theta = 2. * 3.14 * 7. * alpha;
@ -83,7 +67,28 @@ void main(void)
SHr += DirToSh(RSM_to_RH_dir, color.r);
SHg += DirToSh(RSM_to_RH_dir, color.g);
SHb += DirToSh(RSM_to_RH_dir, color.b);
}
}
void main(void)
{
vec3 normalizedRHCenter = 2. * vec3(gl_FragCoord.xy, slice) / resolution - 1.;
vec3 RHcenter = (RHMatrix * vec4(normalizedRHCenter * extents, 1.)).xyz;
vec4 ShadowProjectedRH = RSMMatrix * vec4(RHcenter, 1.);
vec3 RHCellSize = extents / resolution;
vec2 RHuv = .5 * ShadowProjectedRH.xy / ShadowProjectedRH.w + .5;
float RHdepth = .5 * ShadowProjectedRH.z / ShadowProjectedRH.w + .5;
vec4 SHr = vec4(0.);
vec4 SHg = vec4(0.);
vec4 SHb = vec4(0.);
int x = int(gl_FragCoord.x), y = int(gl_FragCoord.y);
float phi = 30. * (x ^ y) + 10. * x * y;
loop(0, RHcenter, RHCellSize, RHuv, RHdepth, SHr, SHg, SHb);
loop(1, RHcenter, RHCellSize, RHuv, RHdepth, SHr, SHg, SHb);
SHr /= 3.14159 * SAMPLES;
SHg /= 3.14159 * SAMPLES;