diff options
author | Campbell Barton <ideasman42@gmail.com> | 2012-02-09 05:53:14 +0400 |
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committer | Campbell Barton <ideasman42@gmail.com> | 2012-02-09 05:53:14 +0400 |
commit | ac4484b2392e4b306b81f97041494ffcbea17520 (patch) | |
tree | c647deb8c9709361d1166d9a1bfe23ab0c367362 /intern/cycles | |
parent | acc6aead5cd47f3e207459cae1c450a12e7e544c (diff) | |
parent | 33bca3075f2cc8201b13a6f08b22d7a1288aab4d (diff) |
svn merge ^/trunk/blender -r43976:43995
Diffstat (limited to 'intern/cycles')
-rw-r--r-- | intern/cycles/kernel/svm/svm_brightness.h | 26 |
1 files changed, 5 insertions, 21 deletions
diff --git a/intern/cycles/kernel/svm/svm_brightness.h b/intern/cycles/kernel/svm/svm_brightness.h index 698899ffd60..7514fc2f2fe 100644 --- a/intern/cycles/kernel/svm/svm_brightness.h +++ b/intern/cycles/kernel/svm/svm_brightness.h @@ -27,28 +27,12 @@ __device void svm_node_brightness(ShaderData *sd, float *stack, uint in_color, u float brightness = stack_load_float(stack, bright_offset); float contrast = stack_load_float(stack, contrast_offset); - brightness *= 1.0f/100.0f; - float delta = contrast * (1.0f/200.0f); - float a = 1.0f - delta * 2.0f; - float b; + float a = 1.0f + contrast; + float b = brightness - contrast*0.5f; - /* - * The algorithm is by Werner D. Streidt - * (http://visca.com/ffactory/archives/5-99/msg00021.html) - * Extracted of OpenCV demhist.c - */ - if (contrast > 0.0f) { - a = (a > 0.0f? (1.0f / a): 0.0f); - b = a * (brightness - delta); - } - else { - delta *= -1.0f; - b = a * (brightness + delta); - } - - color.x = a*color.x + b; - color.y = a*color.y + b; - color.z = a*color.z + b; + color.x = max(a*color.x + b, 0.0f); + color.y = max(a*color.y + b, 0.0f); + color.z = max(a*color.z + b, 0.0f); if (stack_valid(out_color)) stack_store_float3(stack, out_color, color); |