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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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73
data/shaders/rh.frag
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@ -32,6 +32,43 @@ vec4 DirToSh(vec3 dir, float flux)
return SHBasis (dir) * flux;
}
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)
{
// produce a new sample location on the RSM texture
float alpha = (i + .5) / SAMPLES;
float theta = 2. * 3.14 * 7. * alpha;
float h = alpha;
vec2 offset = h * vec2(cos(theta), sin(theta));
vec2 uv = RHuv + offset * 0.01;
// Get world position and normal from the RSM sample
float depth = texture(dtex, uv).x;
vec4 RSMPos = inverse(RSMMatrix) * (2. * vec4(uv, depth, 1.) - 1.);
RSMPos /= RSMPos.w;
vec3 RSMAlbedo = texture(ctex, uv).xyz;
vec3 normal = normalize(2. * texture(ntex, uv).xyz - 1.);
// Sampled location inside the RH cell
vec3 offset3d = vec3(uv, 0);
vec3 SamplePos = RHcenter + .5 * offset3d.xzy * RHCellSize;
// Normalize distance to RSM sample
float dist = distance(SamplePos, RSMPos.xyz) / R_wcs;
// Determine the incident direction.
// Avoid very close samples (and numerical instability problems)
vec3 RSM_to_RH_dir = (dist <= 0.1) ? vec3(0.) : normalize(SamplePos - RSMPos.xyz);
float dotprod = max(dot(RSM_to_RH_dir, normal.xyz), 0.);
float factor = dotprod / (0.1 + dist * dist);
vec3 color = RSMAlbedo.rgb * factor;
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.;
@ -50,40 +87,8 @@ void main(void)
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;
float h = alpha;
vec2 offset = h * vec2(cos(theta), sin(theta));
vec2 uv = RHuv + offset * 0.01;
// Get world position and normal from the RSM sample
float depth = texture(dtex, uv).x;
vec4 RSMPos = inverse(RSMMatrix) * (2. * vec4(uv, depth, 1.) - 1.);
RSMPos /= RSMPos.w;
vec3 RSMAlbedo = texture(ctex, uv).xyz;
vec3 normal = normalize(2. * texture(ntex, uv).xyz - 1.);
// Sampled location inside the RH cell
vec3 offset3d = vec3(uv, 0);
vec3 SamplePos = RHcenter + .5 * offset3d.xzy * RHCellSize;
// Normalize distance to RSM sample
float dist = distance(SamplePos, RSMPos.xyz) / R_wcs;
// Determine the incident direction.
// Avoid very close samples (and numerical instability problems)
vec3 RSM_to_RH_dir = (dist <= 0.1) ? vec3(0.) : normalize(SamplePos - RSMPos.xyz);
float dotprod = max(dot(RSM_to_RH_dir, normal.xyz), 0.);
float factor = dotprod / (0.1 + dist * dist);
vec3 color = RSMAlbedo.rgb * factor;
SHr += DirToSh(RSM_to_RH_dir, color.r);
SHg += DirToSh(RSM_to_RH_dir, color.g);
SHb += DirToSh(RSM_to_RH_dir, color.b);
}
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;