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/*
** Copyright (c) 2012 The Khronos Group Inc.
**
** Permission is hereby granted, free of charge, to any person obtaining a
** copy of this software and/or associated documentation files (the
** "Materials"), to deal in the Materials without restriction, including
** without limitation the rights to use, copy, modify, merge, publish,
** distribute, sublicense, and/or sell copies of the Materials, and to
** permit persons to whom the Materials are furnished to do so, subject to
** the following conditions:
**
** The above copyright notice and this permission notice shall be included
** in all copies or substantial portions of the Materials.
**
** THE MATERIALS ARE PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
** EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
** MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
** IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
** CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
** TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
** MATERIALS OR THE USE OR OTHER DEALINGS IN THE MATERIALS.
*/
#ifdef GL_ES
precision mediump float;
#endif
uniform float mortarThickness;
uniform vec3 brickColor;
uniform vec3 mortarColor;
uniform float brickMortarWidth;
uniform float brickMortarHeight;
uniform float mwf;
uniform float mhf;
varying vec3 Position;
varying float lightIntensity;
void main (void)
{
vec3 ct;
float ss, tt, w, h;
vec3 pos = Position;
ss = pos.x / brickMortarWidth;
tt = pos.z / brickMortarHeight;
if (fract (tt * 0.5) > 0.5)
ss += 0.5;
ss = fract (ss);
tt = fract (tt);
w = step (mwf, ss) - step (1.0 - mwf, ss);
h = step (mhf, tt) - step (1.0 - mhf, tt);
ct = clamp(mix (mortarColor, brickColor, w * h) * lightIntensity, 0.0, 1.0);
gl_FragColor = vec4 (ct, 1.0);
}
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