mirror of
https://github.com/Ttanasart-pt/Pixel-Composer.git
synced 2024-09-21 21:01:20 +02:00
130 lines
3.0 KiB
GLSL
130 lines
3.0 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 float seed;
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uniform float strength;
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uniform float dist;
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uniform int useMap;
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uniform sampler2D strengthMap;
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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 float alpha_curve[4];
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vec3 rgb2hsv(vec3 c) {
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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 = 0.0000000001;
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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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vec3 hsv2rgb(vec3 c) {
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vec4 K = vec4(1.0, 2.0 / 3.0, 1.0 / 3.0, 3.0);
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vec3 p = abs(fract(c.xxx + K.xyz) * 6.0 - K.www);
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return c.z * mix(K.xxx, clamp(p - K.xxx, 0.0, 1.0), c.y);
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}
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float hueDist(float a0, float a1, float t) {
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float da = fract(a1 - a0);
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float ds = fract(2. * da) - da;
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return a0 + ds * t;
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}
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vec3 hsvMix(vec3 c1, vec3 c2, float t) {
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vec3 h1 = rgb2hsv(c1);
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vec3 h2 = rgb2hsv(c2);
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vec3 h = vec3(0.);
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h.x = h.x + hueDist(h1.x, h2.x, t);
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h.y = mix(h1.y, h2.y, t);
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h.z = mix(h1.z, h2.z, t);
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return hsv2rgb(h);
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}
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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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float t = (prog - gradient_time[i - 1]) / (gradient_time[i] - gradient_time[i - 1]);
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if(gradient_blend == 0)
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col = mix(gradient_color[i - 1], gradient_color[i], t);
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else if(gradient_blend == 1)
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col = gradient_color[i - 1];
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else if(gradient_blend == 2)
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col = vec4(hsvMix(gradient_color[i - 1].rgb, gradient_color[i].rgb, t), 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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float curveEval(in float curve[4], in float prog) {
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return pow(1. - prog, 3.) * curve[0] +
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3. * pow(1. - prog, 2.) * prog * curve[1] +
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3. * (1. - prog) * pow(prog, 2.) * curve[2] +
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pow(prog, 3.) * curve[3];
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}
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float frandom (in vec2 st, in float _seed) {
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float f = fract(sin(dot(st.xy, vec2(12.9898, 78.233)) * mod(15.15 + seed, 32.156 + _seed) * 12.588) * 43758.5453123);
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f = f * 2. - 1.;
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return f;
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}
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vec2 vrandom (in vec2 st) {
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return vec2(frandom(st, 165.874), frandom(st, 98.601));
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}
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void main() {
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vec2 _pos = v_vTexcoord;
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float str = strength;
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vec2 _vec = vrandom(_pos) * str * dist;
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if(useMap == 1) {
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vec4 _map = texture2D( strengthMap, _pos);
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_vec.x *= _map.r;
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_vec.y *= _map.g;
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str *= dot(_map.rg, _map.rg);
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}
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str += frandom(_pos, 12.01) * abs(.1) * str;
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vec2 _new_pos = _pos - _vec;
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vec4 _col;
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if(_new_pos == clamp(_new_pos, 0., 1.)) {
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_col = texture2D( gm_BaseTexture, _pos - _vec );
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_col.rgb *= gradientEval(str).rgb;
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_col.a *= curveEval(alpha_curve, str);
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} else {
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_col = vec4(0.);
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}
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gl_FragColor = _col;
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}
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