30 lines
797 B
GLSL
30 lines
797 B
GLSL
/* Luma key simple program
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Based on Edward Cannon's Simple Chroma Key (adaptation by Olive Team)
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Feel free to modify and use at will */
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uniform sampler2D tex;
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varying vec2 vTexCoord;
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uniform float loc;
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uniform float hic;
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uniform bool invert;
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void main(void) {
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vec4 texture_color = texture2D(tex,vTexCoord);
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float luma = max(max(texture_color.r,texture_color.g), texture_color.b) + min(min(texture_color.r,texture_color.g), texture_color.b);
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luma /= 2.0;
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if (luma > hic/100.0) {
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texture_color.a = (invert ? 0.0 : 1.0);
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} else if (luma < loc/100.0) {
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texture_color.a = (invert ? 1.0 : 0.0);
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} else {
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texture_color.a = (invert ? 1.0-luma : luma);
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}
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texture_color.rgb *= texture_color.a;
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gl_FragColor = texture_color;
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}
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