From a9baf19f32d4fd00d8102af76431d8afa53f8784 Mon Sep 17 00:00:00 2001
From: Robert Osfield <robert@openscenegraph.com>
Date: Tue, 7 Feb 2012 12:37:48 +0000
Subject: [PATCH] From Alexander Irion, "Added missing format GL_ALPHA to
 Image::computeFormatDataType()."

---
 src/osg/Image.cpp | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/src/osg/Image.cpp b/src/osg/Image.cpp
index 57f8fb207..3683de8a3 100644
--- a/src/osg/Image.cpp
+++ b/src/osg/Image.cpp
@@ -443,7 +443,8 @@ GLenum Image::computeFormatDataType(GLenum pixelFormat)
         case GL_RGBA:
         case GL_RGB:
         case GL_LUMINANCE:
-        case GL_LUMINANCE_ALPHA: return GL_UNSIGNED_BYTE;
+        case GL_LUMINANCE_ALPHA:
+        case GL_ALPHA: return GL_UNSIGNED_BYTE;
 
         default: 
         {