mirror of
https://github.com/Ttanasart-pt/Pixel-Composer.git
synced 2024-09-21 21:01:20 +02:00
41 lines
1.0 KiB
GLSL
41 lines
1.0 KiB
GLSL
//
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// Simple passthrough fragment shader
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//
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varying vec2 v_vTexcoord;
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varying vec4 v_vColour;
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uniform vec2 dimension;
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uniform int mode;
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void main() {
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float minx = dimension.x;
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float miny = dimension.y;
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float maxx = 0.;
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float maxy = 0.;
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for(float i = 0.; i <= dimension.x; i++)
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for(float j = 0.; j <= dimension.y; j++) {
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vec4 col = texture2D( gm_BaseTexture, vec2(i, j) / (dimension + 1.) );
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if(col.a == 0.) continue;
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minx = min(minx, i);
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miny = min(miny, j);
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maxx = max(maxx, i);
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maxy = max(maxy, j);
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}
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if(mode == 0) {
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float minx_h = floor(minx / 256.) / 255.;
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float minx_l = mod(minx, 256.) / 255.;
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float miny_h = floor(miny / 256.) / 255.;
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float miny_l = mod(miny, 256.) / 255.;
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gl_FragColor = vec4(minx_h, minx_l, miny_h, miny_l);
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} else {
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float maxx_h = floor(maxx / 256.) / 255.;
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float maxx_l = mod(maxx, 256.) / 255.;
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float maxy_h = floor(maxy / 256.) / 255.;
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float maxy_l = mod(maxy, 256.) / 255.;
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gl_FragColor = vec4(maxx_h, maxx_l, maxy_h, maxy_l);
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}
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}
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