A little bit of postprocess shader tinkering.

indra/newview/app_settings/shaders/class1/effects/VignetteF.glsl

@@ -0,0 +1,54 @@
+/**
+ * @file colorFilterF.glsl
+ *
+ * Copyright (c) 2007-$CurrentYear$, Linden Research, Inc.
+ * $License$
+ */
+ 
+#extension GL_ARB_texture_rectangle : enable
+ 
+#ifdef DEFINE_GL_FRAGCOLOR
+out vec4 frag_color;
+#else
+#define frag_color gl_FragColor
+#endif
+
+uniform sampler2DRect tex0;
+uniform float vignette_strength;				//0 - 1
+uniform float vignette_radius;					//0 - 8
+uniform float vignette_darkness;				//0 - 1
+uniform float vignette_desaturation;			//0 - 10
+uniform float vignette_chromatic_aberration;	//0 - .1
+uniform vec2 screen_res;
+
+VARYING vec2 vary_texcoord0;
+
+float luminance(vec3 color)
+{
+	/// CALCULATING LUMINANCE (Using NTSC lum weights)
+	/// http://en.wikipedia.org/wiki/Luma_%28video%29
+	return dot(color, vec3(0.299, 0.587, 0.114));
+}
+
+void main(void) 
+{
+	vec3 color = texture2DRect(tex0, vary_texcoord0).rgb;
+	vec2 norm_texcood = (vary_texcoord0/screen_res);
+	vec2 offset = norm_texcood-vec2(.5);
+	float vignette = clamp(pow(1 - dot(offset,offset),vignette_radius) + 1-vignette_strength, 0.0, 1.0);
+	float inv_vignette = 1-vignette;
+	
+	//vignette chromatic aberration (g
+	vec2 shift = screen_res * offset * vignette_chromatic_aberration * inv_vignette;
+	float g = texture2DRect(tex0,vary_texcoord0-shift).g;
+	float b = texture2DRect(tex0,vary_texcoord0-2*shift).b;
+	color.gb = vec2(g,b);
+
+	//vignette 'black' overlay.
+	color = mix(color * vignette, color, 1-vignette_darkness);
+	
+	//vignette desaturation
+	color = mix(vec3(luminance(color)), color, clamp(1-inv_vignette*vignette_desaturation,0,1));
+	
+	frag_color = vec4(color,1.0);
+}

indra/newview/app_settings/shaders/class1/effects/colorFilterF.glsl

@@ -25,6 +25,13 @@ uniform float gamma;
 
 VARYING vec2 vary_texcoord0;
 
+float luminance(vec3 color)
+{
+	/// CALCULATING LUMINANCE (Using NTSC lum weights)
+	/// http://en.wikipedia.org/wiki/Luma_%28video%29
+	return dot(color, vec3(0.299, 0.587, 0.114));
+}
+
 void main(void) 
 {
 	vec3 color = vec3(texture2DRect(tex0, vary_texcoord0.st));
@@ -39,7 +46,7 @@ void main(void)
 	color = mix(contrastBase, color, contrast);
 
 	/// Modulate saturation
-	color = mix(vec3(dot(color, lumWeights)), color, saturation);
+	color = mix(vec3(luminance(color)), color, saturation);
 
 	frag_color = vec4(color, 1.0);
 }