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Fix Cycles denoising NaNs with a 1 sample renders. 

This was causing different render results with different compilers. We
can't do much useful with 1 sample, but better for debugging.
This commit is contained in:
Brecht Van Lommel 2017-07-21 21:43:49 +02:00
parent b4528d8897
commit ec831ee7d1
1 changed files with 11 additions and 5 deletions
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16
intern/cycles/kernel/filter/filter_prefilter.h
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@ -61,8 +61,8 @@ ccl_device void kernel_filter_divide_shadow(int sample,
varA = max(0.0f, varA - unfilteredA[idx]*unfilteredA[idx]*odd_sample);
varB = max(0.0f, varB - unfilteredB[idx]*unfilteredB[idx]*even_sample);
}
varA /= (odd_sample - 1);
varB /= (even_sample - 1);
varA /= max(odd_sample - 1, 1);
varB /= max(even_sample - 1, 1);
sampleVariance[idx] = 0.5f*(varA + varB) / sample;
sampleVarianceV[idx] = 0.5f * (varA - varB) * (varA - varB) / (sample*sample);
@ -96,11 +96,17 @@ ccl_device void kernel_filter_get_feature(int sample,
int idx = (y-rect.y)*buffer_w + (x - rect.x);
mean[idx] = center_buffer[m_offset] / sample;
if(use_split_variance) {
variance[idx] = max(0.0f, (center_buffer[v_offset] - mean[idx]*mean[idx]*sample) / (sample * (sample-1)));
if (sample > 1) {
if(use_split_variance) {
variance[idx] = max(0.0f, (center_buffer[v_offset] - mean[idx]*mean[idx]*sample) / (sample * (sample-1)));
}
else {
variance[idx] = center_buffer[v_offset] / (sample * (sample-1));
}
}
else {
variance[idx] = center_buffer[v_offset] / (sample * (sample-1));
/* Can't compute variance with single sample, just set it very high. */
variance[idx] = 1e10f;
}
}