Docmuent the GLEW requirement.

[movit] / README

diff --git a/README b/README
index a6bbcfe55398dddf0ce271aa8c844b56f466dcad..485fd341b1bcb2fc00a23d8d94dbe438094ecead 100644 (file)
--- a/README
+++ b/README
@@ -27,6 +27,8 @@ OK, you need
   you're home free.
 * The [Eigen 3] and [Google Test] libraries. (The library itself
   depends only on the former, but you probably want to run the unit tests.)
+* The [GLEW] library, for dealing with OpenGL extensions on various
+  platforms.
 
 Movit has been tested with Intel GPUs with the Mesa drivers
 (you'll probably need at least Mesa 8.0), Radeon 3850 and GeForce GTX 550
@@ -39,9 +41,9 @@ Still TL;DR, please give me the list of filters
 ===============================================
 
 Blur, diffusion, glow, lift/gamma/gain (color correction), mirror,
-mix (add two inputs), scale (bilinear and Lanczos), sharpen
-(both by unsharp mask and by Wiener filters), saturation (or desaturation),
-vignette, and white balance.
+mix (add two inputs), overlay (the Porter-Duff “atop” operation),
+scale (bilinear and Lanczos), sharpen (both by unsharp mask and by
+Wiener filters), saturation (or desaturation), vignette, and white balance.
 
 Yes, that's a short list. But they all look great, are fast and don't give
 you any nasty surprises. (I'd love to include denoise, deinterlace and