28 lines
603 B
Text
28 lines
603 B
Text
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#ifdef GL_ES
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precision mediump float;
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#endif
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uniform int u_circle_count;
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uniform float u_time;
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uniform vec2 u_mouse;
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uniform vec4 u_viewbox; // [x, y, width, height]
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uniform vec2 u_resolution;
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uniform vec3 u_circles[$MAX_CIRCLES];
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uniform vec4 u_color;
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varying vec2 v_pos;
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void main() {
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vec2 uv = v_pos;
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float alpha = 0.0;
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for (int i = 0; i < $MAX_CIRCLES; i++ ){
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if (i >= u_circle_count) { break; }
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float d = distance(uv.xy, u_circles[i].xy);
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alpha = max(1.0 - d/u_circles[i].z, alpha);
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}
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gl_FragColor = u_color;
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gl_FragColor.w *= alpha;
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}
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