kwin/effects/cube/data/1.10/cube-cap.glsl

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uniform sampler2D sampler;
uniform vec4 geometryColor;
uniform float u_opacity;
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uniform int u_mirror;
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uniform int u_untextured;
varying vec2 texcoord0;
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vec2 mirrorTex(vec2 coords) {
vec2 mirrored = coords;
if (u_mirror != 0) {
mirrored.t = mirrored.t * (-1.0) + 1.0;
}
return mirrored;
}
void main() {
vec4 color = geometryColor;
vec2 texCoord = mirrorTex(texcoord0);
vec4 tex = texture2D(sampler, texCoord);
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if (texCoord.s < 0.0 || texCoord.s > 1.0 ||
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texCoord.t < 0.0 || texCoord.t > 1.0 || u_untextured != 0) {
tex = geometryColor;
}
color.rgb = tex.rgb*tex.a + color.rgb*(1.0-tex.a);
color.a = u_opacity;
gl_FragColor = color;
}