diff options
| author | Alexander Gavrilov <angavrilov@gmail.com> | 2016-09-29 00:35:53 +0300 |
|---|---|---|
| committer | Alexander Gavrilov <angavrilov@gmail.com> | 2016-10-01 14:37:03 +0300 |
| commit | 40eedd5df9083ce54c38c6307946488a1fa8aae0 (patch) | |
| tree | e3060fcab4e8ead3d6ec6c9254fddf5cf0b35aec /intern/cycles/kernel/svm/svm_math_util.h | |
| parent | 95fa303efd0b6e2963af423e601bb2869ac82520 (diff) | |
Cycles: implement partial constant folding for exponentiation.
This is also an important mathematical operation that can be folded
if it is known that one argument is a certain constant. For colors
the operation is provided as a Gamma node.
The SVM Gamma node needs a small fix to make it follow the 0 ^ 0 == 1
rule, same as the Power node, or the Gamma node itself in OSL mode.
Reviewers: #cycles
Differential Revision: https://developer.blender.org/D2263
Diffstat (limited to 'intern/cycles/kernel/svm/svm_math_util.h')
| -rw-r--r-- | intern/cycles/kernel/svm/svm_math_util.h | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/intern/cycles/kernel/svm/svm_math_util.h b/intern/cycles/kernel/svm/svm_math_util.h index 6d13a0d8e02..01547b60014 100644 --- a/intern/cycles/kernel/svm/svm_math_util.h +++ b/intern/cycles/kernel/svm/svm_math_util.h @@ -164,6 +164,9 @@ ccl_device float3 svm_math_blackbody_color(float t) { ccl_device_inline float3 svm_math_gamma_color(float3 color, float gamma) { + if(gamma == 0.0f) + return make_float3(1.0f, 1.0f, 1.0f); + if(color.x > 0.0f) color.x = powf(color.x, gamma); if(color.y > 0.0f) |