30 lines
720 B
GLSL
30 lines
720 B
GLSL
uniform float opacity;
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uniform sampler2D tMatcap;
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uniform vec3 color;
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varying vec2 vNormal;
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// color blending from https://www.w3.org/TR/compositing-1/#blendingcolor
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float lum(vec3 c) {
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return c.r * .3 + c.g * .59 + c.b * .11;
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}
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vec3 clipColor(vec3 c) {
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float l = lum(c);
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float n = min(min(c.r, c.g), c.b);
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float x = max(max(c.r, c.g), c.b);
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if (n < 0.) c = l + (((c - l) * l) / (l - n));
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if (x > 1.) c = l + (((c - l) * (1. - l)) / (x - l));
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return c;
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}
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vec3 setLum(vec3 c, float l) {
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float d = l - lum(c);
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return clipColor(c + d);
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}
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void main() {
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vec4 matcap = texture2D(tMatcap, vNormal);
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vec3 coloredMatcap = setLum(color, lum(matcap.rgb));
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gl_FragColor = vec4(coloredMatcap, opacity);
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}
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