mirror of https://github.com/axmolengine/axmol.git
64 lines
1.7 KiB
GLSL
64 lines
1.7 KiB
GLSL
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uniform vec2 center;
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uniform vec2 resolution;
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uniform vec2 u_screenSize;
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vec2 iCenter = center;
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//uniform float iChannelTime[4]; // channel playback time (in seconds)
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//uniform vec3 iChannelResolution[4]; // channel resolution (in pixels)
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vec4 iMouse = vec4(0,0,0,0); // mouse pixel coords. xy: current (if MLB down),
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uniform vec4 u_Time;
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float snoise(vec3 uv, float res)
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{
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const vec3 s = vec3(1e0, 1e2, 1e4);
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uv *= res;
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vec3 uv0 = floor(mod(uv, res))*s;
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vec3 uv1 = floor(mod(uv+vec3(1.), res))*s;
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vec3 f = fract(uv); f = f*f*(3.0-2.0*f);
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vec4 v = vec4(uv0.x+uv0.y+uv0.z, uv1.x+uv0.y+uv0.z,
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uv0.x+uv1.y+uv0.z, uv1.x+uv1.y+uv0.z);
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vec4 r = fract(sin(v*1e-3)*1e5);
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float r0 = mix(mix(r.x, r.y, f.x), mix(r.z, r.w, f.x), f.y);
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r = fract(sin((v + uv1.z - uv0.z)*1e-3)*1e5);
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float r1 = mix(mix(r.x, r.y, f.x), mix(r.z, r.w, f.x), f.y);
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return mix(r0, r1, f.z)*2.-1.;
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}
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void main(void)
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{
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#ifdef METAL
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vec2 fragCoord = vec2(gl_FragCoord.x, u_screenSize.y - gl_FragCoord.y);
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#else
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vec2 fragCoord = gl_FragCoord.xy;
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#endif
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vec2 iResolution = resolution; // viewport resolution (in pixels)
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float iGlobalTime = u_Time[1]; // shader playback time (in seconds)
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//vec2 p = -.5 + fragCoord.xy / iResolution.xy;
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vec2 p = (fragCoord.xy - center.xy) / iResolution.xy;
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p.x *= iResolution.x/iResolution.y;
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float color = 3.0 - (3.*length(2.*p));
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vec3 coord = vec3(atan(p.x,p.y)/6.2832+.5, length(p)*.4, .5);
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for(int i = 1; i <= 3; i++)
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{
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float power = pow(2.0, float(i));
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color += (1.5 / power) * snoise(coord + vec3(0.,-iGlobalTime*.05, iGlobalTime*.01), power*16.);
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}
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gl_FragColor = vec4( color, pow(max(color,0.),2.)*0.4, pow(max(color,0.),3.)*0.15 , 1.0);
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}
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