38 lines
946 B
GLSL
38 lines
946 B
GLSL
uniform sampler2D sample;
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uniform float textureWidth;
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uniform float textureHeight;
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uniform float opacity;
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uniform float brightness;
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uniform float saturation;
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uniform int debug;
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uniform int u_forceAlpha;
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varying vec2 varyingTexCoords;
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//varying vec4 color;
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// Converts pixel coordinates to texture coordinates
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vec2 pix2tex( vec2 pix )
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{
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return vec2( pix.s / textureWidth, pix.t / textureHeight );
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}
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void main() {
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vec4 tex = texture2D(sample, pix2tex(varyingTexCoords));
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if( saturation != 1.0 ) {
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vec3 desaturated = tex.rgb * vec3( 0.30, 0.59, 0.11 );
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desaturated = vec3( dot( desaturated, tex.rgb ));
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tex.rgb = tex.rgb * vec3( saturation ) + desaturated * vec3( 1.0 - saturation );
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}
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tex.rgb = tex.rgb * opacity * brightness;
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tex.a = tex.a * opacity;
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if (u_forceAlpha > 0) {
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tex.a = 1.0;
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}
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/*if (debug != 0) {
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tex.g += 0.5;
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}*/
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gl_FragColor = tex;
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}
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