42 lines
728 B
Plaintext
42 lines
728 B
Plaintext
@vs vert
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in vec3 a_pos;
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uniform float radius;
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uniform vec2 coord;
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uniform mat4 vp;
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out vec2 coords;
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out float rad;
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void main() {
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vec3 pos = a_pos;
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pos.xy -= 0.5;
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pos.xy *= 2;
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coords = pos.xy;
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pos *= radius;
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pos.xy += coord;
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rad = radius;
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gl_Position = vp * vec4(pos,1);
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}
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@end
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@fs frag
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in vec2 coords;
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in float rad;
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uniform vec4 shade;
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uniform float inner_r;
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out vec4 color;
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void main() {
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float px = 1/rad;
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float blur = 1.0+px;
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float R = 1;
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float R2 = 1-inner_r;
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float dist = distance(vec2(0,0),coords);
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float sm = 1 - smoothstep(R-px,R*blur,dist);
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float sm2 = smoothstep(R2-px,R2*blur,dist);
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float alpha = sm*sm2;
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color = vec4(shade.xyz, alpha*shade.a);
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}
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@end
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@program circle vert frag
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