X-Git-Url: http://git.tdb.fi/?p=libs%2Fdemoscene.git;a=blobdiff_plain;f=data%2Fvignette.glsl;fp=data%2Fvignette.glsl;h=58822c482b92c0c2a97e84b886d1e8a26a9d6527;hp=0000000000000000000000000000000000000000;hb=1e3954a988c6d6d946260019f25a4ad3262e01c4;hpb=b8e89ca72ec17461c6d91bf107a7e4b08cf9eff1

diff --git a/data/vignette.glsl b/data/vignette.glsl
new file mode 100644
index 0000000..58822c4
--- /dev/null
+++ b/data/vignette.glsl
@@ -0,0 +1,32 @@
+import postprocess;
+
+uniform Vignette
+{
+	vec2 coord_scale;
+	vec4 optical;
+	vec2 optical_range;
+	float natural;
+};
+
+#pragma MSP stage(fragment)
+void main()
+{
+	vec4 incoming = texture(source, texcoord);
+	vec2 r = vertex.xy*coord_scale;
+	float r_sq = dot(r, r);
+
+	float vignette = 1.0;
+	if(r_sq>=optical_range.y)
+		vignette = 0.0;
+	else if(r_sq>=optical_range.x)
+	{
+		float r = sqrt(r_sq)-optical.x;
+		float v = (optical.z*acos(r/optical.y)-sqrt(optical.z-r*r)*r);
+		vignette = v/optical.w;
+	}
+
+	float c_sq = 1/(1+r_sq*natural);
+	vignette *= c_sq*c_sq;
+
+	frag_color = vec4(incoming.rgb*vignette, incoming.a);
+}