Initial Commit

Java/Processing/processing-3.3.6/modes/java/examples/Topics/Shaders/Conway/Conway.pde

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+// GLSL version of Conway's game of life, ported from GLSL sandbox:
+// http://glsl.heroku.com/e#207.3
+// Exemplifies the use of the ppixels uniform in the shader, that gives
+// access to the pixels of the previous frame.
+PShader conway;
+PGraphics pg;
+
+void setup() {
+  size(400, 400, P3D);    
+  pg = createGraphics(400, 400, P2D);
+  pg.noSmooth();
+  conway = loadShader("conway.glsl");
+  conway.set("resolution", float(pg.width), float(pg.height));  
+}
+
+void draw() {
+  conway.set("time", millis()/1000.0);
+  float x = map(mouseX, 0, width, 0, 1);
+  float y = map(mouseY, 0, height, 1, 0);
+  conway.set("mouse", x, y);  
+  pg.beginDraw();
+  pg.background(0);
+  pg.shader(conway);
+  pg.rect(0, 0, pg.width, pg.height);
+  pg.endDraw();  
+  image(pg, 0, 0, width, height);
+}

Java/Processing/processing-3.3.6/modes/java/examples/Topics/Shaders/Conway/data/conway.glsl

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