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56 lines
1.3 KiB
GLSL
56 lines
1.3 KiB
GLSL
// Author: @patriciogv - 2015
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// Title: Metaballs
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#ifdef GL_ES
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precision mediump float;
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#endif
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uniform vec2 u_resolution;
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uniform vec2 u_mouse;
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uniform float u_time;
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vec2 random2( vec2 p ) {
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return fract(sin(vec2(dot(p,vec2(127.1,311.7)),dot(p,vec2(269.5,183.3))))*43758.5453);
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}
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void main() {
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vec2 st = gl_FragCoord.xy/u_resolution.xy;
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st.x *= u_resolution.x/u_resolution.y;
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vec3 color = vec3(.0);
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// Scale
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st *= 5.;
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// Tile the space
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vec2 i_st = floor(st);
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vec2 f_st = fract(st);
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float m_dist = 1.; // minimum distance
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for (int j= -1; j <= 1; j++ ) {
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for (int i= -1; i <= 1; i++ ) {
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// Neighbor place in the grid
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vec2 neighbor = vec2(float(i),float(j));
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// Random position from current + neighbor place in the grid
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vec2 offset = random2(i_st + neighbor);
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// Animate the offset
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offset = 0.5 + 0.5*sin(u_time + 6.2831*offset);
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// Position of the cell
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vec2 pos = neighbor + offset - f_st;
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// Cell distance
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float dist = length(pos);
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// Metaball it!
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m_dist = min(m_dist, m_dist*dist);
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}
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}
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// Draw cells
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color += step(0.060, m_dist);
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gl_FragColor = vec4(color,1.0);
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}
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