- added libdrawtext

[demo_prior] / sdr / vignette.p.glsl

diff --git a/sdr/vignette.p.glsl b/sdr/vignette.p.glsl
new file mode 100644 (file)
index 0000000..ca28cb9
--- /dev/null
+++ b/sdr/vignette.p.glsl
@@ -0,0 +1,11 @@
+uniform vec3 color;
+uniform float offset, sharpness;
+
+void main()
+{
+       vec2 p = gl_TexCoord[0].st * 2.0 - 1.0;
+       float d = max(length(p) - offset, 0.0);
+       float vnt = pow(d, sharpness);
+
+       gl_FragColor = vec4(color, gl_Color.a * vnt);
+}