[Bf-blender-cvs] [836fc68] compositor-2016: GLSL: Fix voronoi texture giving different results form rendered

[Sergey Sharybin]

Commit: 836fc68c526bc5a15d628ba282fc401cbe824902
Author: Sergey Sharybin
Date:   Mon May 30 13:07:11 2016 +0200
Branches: compositor-2016
https://developer.blender.org/rB836fc68c526bc5a15d628ba282fc401cbe824902

GLSL: Fix voronoi texture giving different results form rendered

===================================================================

M       source/blender/gpu/shaders/gpu_shader_material.glsl

===================================================================

diff --git a/source/blender/gpu/shaders/gpu_shader_material.glsl 
b/source/blender/gpu/shaders/gpu_shader_material.glsl
index a3b0580..91ca6a5 100644
--- a/source/blender/gpu/shaders/gpu_shader_material.glsl
+++ b/source/blender/gpu/shaders/gpu_shader_material.glsl
@@ -2403,6 +2403,12 @@ int floor_to_int(float x)
 {
        return int(floor(x));
 }
+
+int quick_floor(float x)
+{
+       return int(x) - ((x < 0) ? 1 : 0);
+}
+
 #ifdef BIT_OPERATIONS
 float integer_noise(int n)
 {
@@ -2453,9 +2459,9 @@ float bits_to_01(uint bits)
 
 float cellnoise(vec3 p)
 {
-       int ix = floor_to_int(p.x);
-       int iy = floor_to_int(p.y);
-       int iz = floor_to_int(p.z);
+       int ix = quick_floor(p.x);
+       int iy = quick_floor(p.y);
+       int iz = quick_floor(p.z);
 
        return bits_to_01(hash(uint(ix), uint(iy), uint(iz)));
 }

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