From 728b8c930130c928cd48161604cef7a407884842 Mon Sep 17 00:00:00 2001
From: Robert Osfield <robert@openscenegraph.com>
Date: Sun, 9 Jan 2005 19:30:56 +0000
Subject: [PATCH] Added setImageReadFormat and setImageReadDataType methods to
 RenderToTextureStage to allow customization of what format/data type to read
 such as reading from the depth buffer etc.

---
 include/osgUtil/RenderToTextureStage | 8 ++++++++
 src/osgUtil/RenderToTextureStage.cpp | 4 +++-
 2 files changed, 11 insertions(+), 1 deletion(-)

diff --git a/include/osgUtil/RenderToTextureStage b/include/osgUtil/RenderToTextureStage
index afeb8a6c9..50bcd89f4 100644
--- a/include/osgUtil/RenderToTextureStage
+++ b/include/osgUtil/RenderToTextureStage
@@ -45,6 +45,12 @@ class OSGUTIL_EXPORT RenderToTextureStage : public RenderStage
         
         void setImage(osg::Image* image) { _image = image; }
         osg::Image* getImage() { return _image.get(); }
+        
+        void setImageReadPixelFormat(GLenum format) { _imageReadPixelFormat = format; }
+        GLenum getImageReadPixelFormat() const { return _imageReadPixelFormat; }
+
+        void setImageReadPixelDataType(GLenum type) { _imageReadPixelDataType = type; }
+        GLenum getImageReadPixelDataType() const { return _imageReadPixelDataType; }
 
         virtual void draw(osg::State& state,RenderLeaf*& previous);
 
@@ -57,6 +63,8 @@ class OSGUTIL_EXPORT RenderToTextureStage : public RenderStage
         
         osg::ref_ptr<osg::Texture2D> _texture;
         osg::ref_ptr<osg::Image> _image;
+        GLenum                   _imageReadPixelFormat;
+        GLenum                   _imageReadPixelDataType;
 
 };
 
diff --git a/src/osgUtil/RenderToTextureStage.cpp b/src/osgUtil/RenderToTextureStage.cpp
index 733307d02..d802a633d 100644
--- a/src/osgUtil/RenderToTextureStage.cpp
+++ b/src/osgUtil/RenderToTextureStage.cpp
@@ -20,6 +20,8 @@ using namespace osgUtil;
 
 RenderToTextureStage::RenderToTextureStage()
 {
+    _imageReadPixelFormat = GL_RGBA;
+    _imageReadPixelDataType = GL_UNSIGNED_BYTE;
 }
 
 RenderToTextureStage::~RenderToTextureStage()
@@ -49,6 +51,6 @@ void RenderToTextureStage::draw(osg::State& state,RenderLeaf*& previous)
     }
     
     if (_image.valid())
-        _image->readPixels(_viewport->x(),_viewport->y(),_viewport->width(),_viewport->height(),GL_RGBA,GL_UNSIGNED_BYTE);
+        _image->readPixels(_viewport->x(),_viewport->y(),_viewport->width(),_viewport->height(),_imageReadPixelFormat,_imageReadPixelDataType);
 
 }