1 files changed, 15 insertions, 5 deletions
diff --git a/shaders/circle_mask.glsl b/shaders/circle_mask.glsl
index 9f82591..0266d2c 100644
--- a/shaders/circle_mask.glsl
+++ b/shaders/circle_mask.glsl
@@ -1,9 +1,19 @@
 uniform sampler2D texture;
+uniform vec2 resolution;
+
+vec4 circle(vec2 uv, vec2 pos, float rad, vec4 color) {
+	float d = length(pos - uv) - rad;
+	float t = clamp(d, 0.0, 1.0);
+	return vec4(color.rgb, color.a * (1.0 - t));
+}
 
 void main() {
-    vec4 pixel = texture2D(texture, gl_TexCoord[0].xy);
-    vec2 pixelOffset = gl_TexCoord[0].xy - vec2(0.5, 0.5);
-    float dist = sqrt(dot(pixelOffset, pixelOffset));
-    dist = smoothstep(0.47, 0.5, dist);
-    gl_FragColor = gl_Color * pixel * vec4(1.0, 1.0, 1.0, 1.0 - dist);
+    vec2 uv = gl_TexCoord[0].xy * resolution;
+	vec2 center = resolution * 0.5;
+	float radius = 0.49 * resolution.y;
+
+    vec4 texture_color = texture2D(texture, gl_TexCoord[0].xy);
+	vec4 layer1 = vec4(0.0, 0.0, 0.0, 0.0);
+	vec4 layer2 = circle(uv, center, radius, texture_color);
+	gl_FragColor = mix(layer1, layer2, layer2.a);
 }