Spazer/src/psychadelic-graphics/psychadelicColors.frag.glsl

#version 300 es
precision highp float;

uniform float u_time;

uniform float u_canvasWidth;
uniform float u_canvasHeight;


out vec4 fragColor;

void main() {
    vec2 uv = gl_FragCoord.xy/vec2(u_canvasWidth, u_canvasHeight);

    vec3 red = vec3(1.0, 0.0, 0.0);
    vec3 green = vec3(0.0, 1.0, 0.0);
    vec3 blue = vec3(0.0, 0.0, 1.0);

    if (uv.x < 0.33) {
        fragColor = vec4(red, 1.0);
    } else if (uv.x < 0.66) {
        fragColor = vec4(green, 1.0);
    } else {
        fragColor = vec4(blue, 1.0);
    }
 
}