55 lines
1.5 KiB
GLSL
55 lines
1.5 KiB
GLSL
// Conway's game of life
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#ifdef GL_ES
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precision highp float;
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#endif
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uniform float time;
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uniform vec2 mouse;
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uniform vec2 resolution;
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uniform sampler2D backbuffer;
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vec4 live = vec4(0.5,1.0,0.7,1.);
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vec4 dead = vec4(0.,0.,0.,1.);
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vec4 blue = vec4(0.,0.,1.,1.);
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void main( void ) {
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vec2 position = ( gl_FragCoord.xy / resolution.xy );
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vec2 pixel = 1./resolution;
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if (length(position-mouse) < 0.01) {
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float rnd1 = mod(fract(sin(dot(position + time * 0.001, vec2(14.9898,78.233))) * 43758.5453), 1.0);
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if (rnd1 > 0.5) {
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gl_FragColor = live;
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} else {
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gl_FragColor = blue;
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}
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} else {
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float sum = 0.;
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sum += texture2D(backbuffer, position + pixel * vec2(-1., -1.)).g;
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sum += texture2D(backbuffer, position + pixel * vec2(-1., 0.)).g;
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sum += texture2D(backbuffer, position + pixel * vec2(-1., 1.)).g;
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sum += texture2D(backbuffer, position + pixel * vec2(1., -1.)).g;
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sum += texture2D(backbuffer, position + pixel * vec2(1., 0.)).g;
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sum += texture2D(backbuffer, position + pixel * vec2(1., 1.)).g;
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sum += texture2D(backbuffer, position + pixel * vec2(0., -1.)).g;
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sum += texture2D(backbuffer, position + pixel * vec2(0., 1.)).g;
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vec4 me = texture2D(backbuffer, position);
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if (me.g <= 0.1) {
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if ((sum >= 2.9) && (sum <= 3.1)) {
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gl_FragColor = live;
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} else if (me.b > 0.004) {
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gl_FragColor = vec4(0., 0., max(me.b - 0.004, 0.25), 0.);
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} else {
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gl_FragColor = dead;
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}
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} else {
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if ((sum >= 1.9) && (sum <= 3.1)) {
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gl_FragColor = live;
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} else {
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gl_FragColor = blue;
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}
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}
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}
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}
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