Add shader

1 files changed, 17 insertions, 0 deletions

diff --git a/tests/circle_mask.glsl b/tests/circle_mask.glsl
new file mode 100644
index 0000000..0564cf3
--- /dev/null
+++ b/tests/circle_mask.glsl
@@ -0,0 +1,17 @@
+uniform sampler2D texture;
+uniform vec2 resolution;
+
+vec4 circle(vec2 uv, vec2 pos, float rad, vec4 color) {
+    float d = smoothstep(0.0, 2.0, length(pos - uv) - rad);
+    float t = clamp(d, 0.0, 1.0);
+    return vec4(color.rgb, color.a * (1.0 - t));
+}
+
+void main() {
+    vec2 uv = gl_TexCoord[0].xy * resolution;
+    vec2 center = resolution * 0.5;
+    float radius = 0.5 * resolution.y - 1.0;
+
+    vec4 texture_color = texture2D(texture, gl_TexCoord[0].xy);
+    gl_FragColor = circle(uv, center, radius, texture_color);
+}
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