brick.frag - mozsearch

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/*

Copyright (c) 2019 The Khronos Group Inc.

Use of this source code is governed by an MIT-style license that can be

found in the LICENSE.txt file.

*/

#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);