ベアッガイ.glsl

precision mediump float;
uniform float t;       // time
uniform vec2  r;       // resolution

const float PI = 3.1415926;
const vec3 red = vec3(1.0, 0.0, 0.0);
const vec3 yellow = vec3(1.0, 1.0, 0.2);
const vec3 white = vec3(1.0);
const vec3 black = vec3(0.15, 0.15, 0.15);
const vec3 gray = vec3(0.4, 0.4, 0.4);

void circle(vec2 p, vec2 offset, float size, vec3 color, inout vec3 i) {
    float l = length(p - offset);
    if(l < size) {
        i = color;
    }
}

void ellipse(vec2 p, vec2 offset, vec2 prop, float size, vec3 color, inout vec3 i) {
    vec2 q = (p - offset) / prop;
    if(length(q) < size) {
        i = color;
    }
}

void circleLine(vec2 p, vec2 offset, float iSize, float oSize, vec3 color, inout vec3 i) {
    float l = length(p - offset);
    if(l > iSize && l < oSize) {
        i = color;
    }
}

void arcLine(vec2 p, vec2 offset, float iSize, float oSize, float rad, float height, vec3 color, inout vec3 i) {
    float s = sin(rad);
    float c = cos(rad);
    vec2 q = (p - offset) * mat2(c, -s, s, c);
    float l = length(q);
    if(l > iSize && l < oSize && q.y > height) {
        i = color;
    }
}

void main(void) {
	vec2 p = (gl_FragCoord.xy * 2.0 - r) / min(r.x, r.y);
	vec3 destColor = vec3(1.0);
	
	circle(p, vec2(-0.4, 0.35), 0.15, yellow, destColor);
	circleLine(p, vec2(-0.4, 0.35), 0.15, 0.16, gray, destColor);
	circle(p, vec2(-0.4, 0.35), 0.08, white, destColor);
	
	circle(p, vec2(0.4, 0.35), 0.15, yellow, destColor);
	circleLine(p, vec2(0.4, 0.35), 0.15, 0.16, gray, destColor);
	circle(p, vec2(0.4, 0.35), 0.08, white, destColor);
	
	circle(p, vec2(0.0), 0.5, yellow, destColor);
	circleLine(p, vec2(0.0), 0.5, 0.51, gray, destColor);
	
	ellipse(p, vec2(0.15, 0.05), vec2(0.65, 1.0), 0.075, black, destColor);
    ellipse(p, vec2(-0.15, 0.05), vec2(0.75, 1.0), 0.075, black, destColor);
	
	ellipse(p, vec2(0, -0.25), vec2(1.75, 1.0), 0.150, white, destColor);
	ellipse(p, vec2(0, -0.20), vec2(1.75, 1.0), 0.025, black, destColor);
	
	arcLine(p * vec2(0.9, 0.95), vec2(0.0, -0.15), 0.19, 0.20, PI, 0.19, black, destColor);
	gl_FragColor = vec4(destColor, 1.0);
}