027-draw-two-circles.glsl

#ifdef GL_ES
precision mediump float;
#endif

uniform vec2 u_resolution;

#include "./libs/2dshapes.glsl"
#include "./libs/boolean-ops.glsl"

void main(){
    vec2 coord = 2.0 * gl_FragCoord.xy / u_resolution.xy - 1.0;
    coord.x *= u_resolution.x / u_resolution.y;

    //
    vec4 colorA = vec4(1.0, 1.0, 1.0, 1.0);
    vec4 colorB = vec4(1.0, 0.0, 0.0, 1.0);

    float circleA = circle(coord - vec2(0.4, 0.4), 0.1);
    float circleB = circle(coord + vec2(0.4, 0.4), 0.1);

    float twoCircles = merge(circleA, circleB);



    vec4 color = mix(colorA, colorB, twoCircles);


    gl_FragColor=color;
    
}