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Cycles: initialize LCG for sss and hair sampling without using the sobol sampler,

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slightly faster but also fixes the u/v sampling dimensions not longer being at even
values which is needed for best results.
This commit is contained in:
Brecht Van Lommel
2013-04-17 14:48:01 +00:00
parent cf0e457e52
commit 45552a4595
3 changed files with 8 additions and 11 deletions
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12
intern/cycles/kernel/kernel_path.h
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@@ -258,8 +258,7 @@ __device float4 kernel_path_progressive(KernelGlobals *kg, RNG *rng, int sample,
difl = kernel_data.curve_kernel_data.minimum_width * len(pixdiff) * 0.5f;
}
float extmax = kernel_data.curve_kernel_data.maximum_width;
float rng_hair_seed = path_rng(kg, rng, sample, rng_offset + PRNG_HAIR);
uint lcg_state = lcg_init(rng_hair_seed);
uint lcg_state = lcg_init(*rng + rng_offset + sample);
bool hit = scene_intersect(kg, &ray, visibility, &isect, &lcg_state, difl, extmax);
#else
@@ -377,7 +376,7 @@ __device float4 kernel_path_progressive(KernelGlobals *kg, RNG *rng, int sample,
/* do bssrdf scatter step if we picked a bssrdf closure */
if(sc) {
uint lcg_state = lcg_init(rbsdf);
uint lcg_state = lcg_init(*rng + rng_offset + sample);
subsurface_scatter_step(kg, &sd, state.flag, sc, &lcg_state, false);
}
}
@@ -601,7 +600,7 @@ __device void kernel_path_indirect(KernelGlobals *kg, RNG *rng, int sample, Ray
/* do bssrdf scatter step if we picked a bssrdf closure */
if(sc) {
uint lcg_state = lcg_init(rbsdf);
uint lcg_state = lcg_init(*rng + rng_offset + sample);
subsurface_scatter_step(kg, &sd, state.flag, sc, &lcg_state, false);
}
}
@@ -930,8 +929,7 @@ __device float4 kernel_path_non_progressive(KernelGlobals *kg, RNG *rng, int sam
difl = kernel_data.curve_kernel_data.minimum_width * len(pixdiff) * 0.5f;
}
float extmax = kernel_data.curve_kernel_data.maximum_width;
float rng_hair_seed = path_rng(kg, rng, sample, rng_offset + PRNG_HAIR);
uint lcg_state = lcg_init(rng_hair_seed);
uint lcg_state = lcg_init(*rng + rng_offset + sample);
if(!scene_intersect(kg, &ray, visibility, &isect, &lcg_state, difl, extmax)) {
#else
@@ -1017,7 +1015,7 @@ __device float4 kernel_path_non_progressive(KernelGlobals *kg, RNG *rng, int sam
continue;
/* set up random number generator */
uint lcg_state = lcg_init(rbsdf);
uint lcg_state = lcg_init(*rng + rng_offset + sample);
int num_samples = kernel_data.integrator.subsurface_samples;
float num_samples_inv = 1.0f/num_samples;