precision highp float; uniform vec2 resolution; uniform float time; uniform vec2 mouse; uniform sampler2D backbuffer; float t; #define PI 3.141592653589793 vec2 getScreenSpace() { vec2 uv = (gl_FragCoord.xy - 0.5 * resolution.xy) / min(resolution.y, resolution.x); return uv; } // Gaussian blur courtesy of https://www.shadertoy.com/view/XdfGDH float normpdf(in float x, in float sigma) { return 0.39894*exp(-0.5*x*x/(sigma*sigma))/sigma; } vec4 blurBuffer(vec2 uv) { //declare stuff const int mSize = 11; const int kSize = (mSize-1)/2; float kernel[mSize]; vec3 final_colour = vec3(0.0); //create the 1-D kernel float sigma = 7.0; float Z = 0.0; for (int j = 0; j <= kSize; ++j) { kernel[kSize+j] = kernel[kSize-j] = normpdf(float(j), sigma); } //get the normalization factor (as the gaussian has been clamped) for (int j = 0; j < mSize; ++j) { Z += kernel[j]; } //read out the texels for (int i=-kSize; i <= kSize; ++i) { for (int j=-kSize; j <= kSize; ++j) { final_colour += kernel[kSize+j]*kernel[kSize+i]*texture2D(backbuffer, (gl_FragCoord.xy+vec2(float(i),float(j))) / resolution.xy).rgb; } } return vec4(final_colour/(Z*Z), 1.0); } vec2 diagonalhash2(vec2 p) { return fract(vec2(sin((p.x + p.y) * 15.543) * 73964.686, sin((p.x + p.y) * 55.8543)*28560.986)); } vec3 getColour(float d) { vec3 c = vec3(0.15); if( d <= .25 ) { c = vec3(1.); } else if( d <= .5 ) { c = vec3(0.5); } else if( d <= .75 ) { c = vec3(0.); } return c; } vec3 pattern(vec2 uv, vec2 m) { vec2 grid = floor(uv); vec2 subuv = fract(uv); vec2 rand = diagonalhash2(grid); vec2 rand2 = diagonalhash2(grid + 100.); float shade = 0.; float df; // if(rand2.x < .5) { // float s = sin(time*rand2.y*.5); // float c = cos(time*rand2.y*.5); // subuv *= mat2(c, -s, s, c); // } if( rand.x <= .25 ) { df = subuv.x - subuv.y; // tl } else if( rand.x <= .5 ) { df = 1. - subuv.y - subuv.x; } else if( rand.x <= .75 ) { df = subuv.y - subuv.x; } else if( rand.x <= 1. ) { df = subuv.y - 1. + subuv.x; } shade = sin(df * floor(20. * rand.x * rand.y)); shade += sin(df * rand.x * rand.y); float aa = rand.x * rand.y * .001; shade = smoothstep(.0, aa, shade); float mouseMask = smoothstep(.1, .8, length(m)); vec3 c1 = mix(getColour(rand.x), getColour(rand2.x), mouseMask); vec3 c2 = mix(getColour(rand.y), getColour(rand2.y), mouseMask); return mix(c1, c2, shade ); } vec3 mainb() { vec2 uv = gl_FragCoord.xy+gl_FragCoord.xy-floor(resolution.xy); float fade = length(getScreenSpace()); uv = vec2(log(length(uv)/resolution.y)+t*.2+mouse.y*10., atan(uv.y,uv.x)+t*.1+mouse.x );; uv = 1.911*uv*mat2(1.,-1,.9,1); vec2 m = vec2(0); float innerFade = (smoothstep(0., 1., fade) * .5 + .4); innerFade *= innerFade; return pattern(uv, m) * innerFade * (smoothstep(1.5, 0., fade*fade)); } void main(void) { t = time * .3; vec4 tex = blurBuffer(gl_FragCoord.xy/resolution.xy); gl_FragColor = vec4(tex.rgb*.98 + mainb()*.1, 1.); }

Light 2