mirror of
https://github.com/Ttanasart-pt/Pixel-Composer.git
synced 2024-11-14 06:23:55 +01:00
73 lines
1.5 KiB
GLSL
73 lines
1.5 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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#define TAU 6.28318
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uniform int gradient_blend;
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uniform vec4 gradient_color[16];
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uniform float gradient_time[16];
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uniform int gradient_keys;
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uniform int gradient_loop;
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uniform vec2 center;
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uniform float angle;
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uniform float radius;
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uniform float shift;
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uniform int type;
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vec4 gradientEval(in float prog) {
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vec4 col = vec4(0.);
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for(int i = 0; i < 16; i++) {
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if(gradient_time[i] == prog) {
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col = gradient_color[i];
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break;
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} else if(gradient_time[i] > prog) {
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if(i == 0)
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col = gradient_color[i];
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else {
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if(gradient_blend == 0)
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col = mix(gradient_color[i - 1], gradient_color[i], (prog - gradient_time[i - 1]) / (gradient_time[i] - gradient_time[i - 1]));
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else if(gradient_blend == 1)
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col = gradient_color[i - 1];
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}
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break;
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}
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if(i >= gradient_keys - 1) {
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col = gradient_color[gradient_keys - 1];
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break;
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}
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}
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return col;
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}
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void main() {
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float prog = 0.;
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if(type == 0) {
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prog = .5 + (v_vTexcoord.x - center.x) * cos(angle) - (v_vTexcoord.y - center.y) * sin(angle);
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} else if(type == 1) {
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prog = distance(v_vTexcoord, center) / radius;
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} else if(type == 2) {
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vec2 _p = v_vTexcoord - center;
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float _a = atan(_p.y, _p.x) + angle;
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prog = (_a - floor(_a / TAU) * TAU) / TAU;
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}
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prog = abs(prog + shift);
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if(gradient_loop == 1) {
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if(prog > 1.) {
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if(prog == floor(prog))
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prog = 1.;
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else
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prog = fract(prog);
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}
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}
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vec4 col = gradientEval(prog);
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gl_FragColor = col;
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}
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