28 lines
653 B
GLSL
28 lines
653 B
GLSL
// Inputs
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uniform sampler2D tex_in;
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uniform sampler2D opacity_in;
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// Input texture coordinate
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in vec2 ove_texcoord;
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out vec4 frag_color;
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vec3 rgb2hsv(vec3 c)
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{
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vec4 K = vec4(0.0, -1.0 / 3.0, 2.0 / 3.0, -1.0);
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vec4 p = mix(vec4(c.bg, K.wz), vec4(c.gb, K.xy), step(c.b, c.g));
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vec4 q = mix(vec4(p.xyw, c.r), vec4(c.r, p.yzx), step(p.x, c.r));
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float d = q.x - min(q.w, q.y);
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float e = 1.0e-10;
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return vec3(abs(q.z + (q.w - q.y) / (6.0 * d + e)), d / (q.x + e), q.x);
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}
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void main() {
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vec4 value = texture(opacity_in, ove_texcoord);
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float v = rgb2hsv(value.rgb).b;
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vec4 c = texture(tex_in, ove_texcoord);
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c *= v;
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frag_color = c;
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}
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