Created
August 31, 2020 14:37
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reaction diffusion
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| // REACCCION DIFUSION | |
| // adaptacion a The Force | |
| // shader creado por Keijiro | |
| // https://github.com/keijiro/ShaderSketches/blob/master/Fragment/ReactDiffuse.glsl | |
| float rand2(vec2 p) | |
| { | |
| return fract(sin(dot(p, vec2(12.9898, 78.233))) * 43758.5453); | |
| } | |
| vec2 ReactDiffuse(vec2 p) | |
| { | |
| vec4 duv = vec4(1, 1, -1, 0) / resolution.xyxy; | |
| vec2 s = texture2D(backbuffer, p).xy; | |
| vec2 lpc = | |
| texture2D(backbuffer, p - duv.xy).xy * 0.05 + | |
| texture2D(backbuffer, p - duv.wy).xy * 0.20 + | |
| texture2D(backbuffer, p - duv.zy).xy * 0.05 + | |
| texture2D(backbuffer, p - duv.xw).xy * 0.2 + | |
| s * -1. + | |
| texture2D(backbuffer, p + duv.xw).xy * 0.20 + | |
| texture2D(backbuffer, p + duv.zy).xy * 0.05 + | |
| texture2D(backbuffer, p + duv.wy).xy * 0.20 + | |
| texture2D(backbuffer, p + duv.xy).xy * 0.05; | |
| const float f = 0.0545; | |
| const float k = 0.0650; | |
| s += vec2( | |
| lpc.x * 1.00 - s.x * s.y * s.y + f * (1. - s.x), | |
| lpc.y * 0.3 + s.x * s.y * s.y - (k + f) * s.y | |
| ); | |
| return s; | |
| } | |
| void main(void) | |
| { | |
| bool initiate = false; | |
| // *** TO INITIATE THE STATE, ENABLE THE LINE BELOW. *** | |
| //initiate = true; | |
| vec2 uv = gl_FragCoord.xy / resolution; | |
| if (initiate) | |
| { | |
| gl_FragColor = vec4(1, step(0.9, rand(uv + time * 0.01)), 0, 0); | |
| } | |
| else if (uv.x < 0.5) | |
| { | |
| gl_FragColor = vec4(ReactDiffuse(uv), 0, 0); | |
| } | |
| else | |
| { | |
| vec2 s = texture2D(backbuffer, uv - vec2(0.5, 0)).xy; | |
| float c = smoothstep(-0.2, 0.2, s.y - s.x); | |
| gl_FragColor = vec4(c, c, c, 1); | |
| } | |
| } |
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