pass1.frag


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#version 460 core

#include "consts.h"

out vec4 color;
in vec4 gl_FragCoord;

uniform float time;
uniform sampler2D buf;

ivec2 window = ivec2(RES_H, RES_V);

void main() {
	vec2 point = vec2(sin(time), cos(time)) * 0.7;
	point.x *= float(window.y) / float(window.x); // adjust for aspect ratio
	point = ((point + 1.0) / 2.0) * window.xy; // convert to screen coords
	float r = 20.0; // circle radius

	color = vec4(0.0);
	if (length(gl_FragCoord.xy - point) < r)
		color = vec4(1.0);

	color += texture(buf, gl_FragCoord.xy / window.xy) * 0.95;
}