WIP add framebuffer

1 files changed, 15 insertions, 11 deletions

diff --git a/visuals.frag b/visuals.frag
index d680834..35f9a6a 100644
--- a/visuals.frag
+++ b/visuals.frag
@@ -1,18 +1,22 @@
-#version 330 core
+#version 460 core
+
+out vec4 color;
+in vec4 gl_FragCoord;
 
 uniform float time;
 uniform ivec2 window;
-
-// adapted from <https://www.shadertoy.com/view/4djSRW>
-float hash12(vec2 p) {
-	vec3 p3 = fract(vec3(p.xyx) * .1031);
-	p3 += dot(p3, p3.yzx + 33.33);
-	return fract((p3.x + p3.y) * p3.z);
-}
+uniform sampler2D buf;
 
 void main() {
-	vec2 uv = gl_FragCoord.xy / window;
-	vec2 pos = gl_FragCoord.xy + time;
-	gl_FragColor = vec4(hash12(pos), uv.xy, 1.0);
+	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) * 0.90;
 }