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Use spiral mapping for SSAO - it reduces banding a lot, especially in 

higher sample counts. Probably a blurring pass might be a good addition
here as well.
This commit is contained in:
Antonis Ryakiotakis 2015-02-25 23:10:01 +01:00
parent 442664e02c
commit 22ab4e6e13
1 changed files with 23 additions and 1 deletions
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24
source/blender/gpu/intern/gpu_compositing.c
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@ -113,6 +113,7 @@ struct GPUFX {
bool restore_stencil;
};
#if 0
/* concentric mapping, see "A Low Distortion Map Between Disk and Square" and
* http://psgraphics.blogspot.nl/2011/01/improved-code-for-concentric-map.html */
static GPUTexture * create_concentric_sample_texture(int side)
@ -145,6 +146,27 @@ static GPUTexture * create_concentric_sample_texture(int side)
MEM_freeN(texels);
return tex;
}
#endif
static GPUTexture * create_spiral_sample_texture(int side)
{
GPUTexture *tex;
int numsaples = side * side;
float *texels = (float *)MEM_mallocN(sizeof(float) * 2 * numsaples, "concentric_tex");
int i;
const int spirals = 8;
for (i = 0; i < numsaples; i++) {
float r = (i + 0.5f) / (float) numsaples;
float phi = 2.0f * M_PI * r * spirals;
texels[i * 2] = r * cos(phi);
texels[i * 2 + 1] = r * sin(phi);
}
tex = GPU_texture_create_1D_procedural(side * side, texels, NULL);
MEM_freeN(texels);
return tex;
}
/* generate a new FX compositor */
GPUFX *GPU_fx_compositor_create(void)
@ -343,7 +365,7 @@ bool GPU_fx_compositor_initialize_passes(
GPU_texture_free(fx->ssao_concentric_samples_tex);
}
fx->ssao_concentric_samples_tex = create_concentric_sample_texture(fx_settings->ssao->samples);
fx->ssao_concentric_samples_tex = create_spiral_sample_texture(fx_settings->ssao->samples);
}
}
else {