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Fix T43380 modulo operation in GLSL does not return negatives. 

Make it so by checking operand sign.
This commit is contained in:
Antonis Ryakiotakis 2015-02-03 15:08:28 +01:00
parent 8186214c39
commit 3ff9e52dca
Notes: blender-bot 2023-10-12 12:49:04 +02:00 
Referenced by issue #43380, Math function "Modulo" in Cycles presents different result to the "GLSL material".
1 changed files with 4 additions and 0 deletions
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source/blender/gpu/shaders/gpu_shader_material.glsl
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@ -297,6 +297,10 @@ void math_modulo(float val1, float val2, out float outval)
outval = 0.0;
else
outval = mod(val1, val2);
/* change sign to match C convention, mod in GLSL will take absolute for negative numbers,
* see https://www.opengl.org/sdk/docs/man/html/mod.xhtml */
outval = (val1 > 0) ? outval : -outval;
}
void math_abs(float val1, out float outval)