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Timestamp:
11/21/09 17:41:02 (5 years ago)
Author:
robert
Message:

From Colin MacDonald?, "In my application I have a custom graphics context class, derived from
osg::GraphicsContext?, in order to give good integration with the
application's GUI toolkit. This works really well.

However, I need to share OpenGL texture resources with the standard
osgViewer GraphicsContext? implementations, in particular the
PixelBuffers?. This is essential for my application to conserve graphics
memory on low-end hardware. Currently the standard osg implementations
will not share resources with another derived osg::GraphicsContext?,
other than the pre-defined osgViewer classes e.g. PixelBufferX11 is
hardcoded to only share resources with GraphicsWindowX11 and
PixelBufferX11 objects, and no other osg::GraphicsContext? object.

To address this in the cleanest way I could think of, I have moved the
OpenGL handle variables for each platform into a small utility class,
e.g. GraphicsHandleX11 for unix. Then GraphicsWindowX11, PixelBufferX11
and any other derived osg::GraphicsContext? class can inherit from
GraphicsHandleX11 to share OpenGL resources.

I have updated the X11, Win32 and Carbon implementations to use this.
The changes are minor. I haven't touched the Cocoa implmentation as
I'm not familiar with it at all and couldn't test it - it will work
unchanged.

Without this I had some horrible hacks in my application, this greatly
simplifies things for me. It also simplifies the osgViewer
implementations slightly. Perhaps it may help with other users'
desires to share resources with external graphics contexts, as was
discussed on the user list recently."

Notes from Robert Osfield, adapted Colin's submission to work with the new EGL related changes.

Files:
1 modified

Legend:

Unmodified
Added
Removed
  • OpenSceneGraph/trunk/src/osgViewer/CMakeLists.txt

    r10703 r10813  
    5454 
    5555    SET(LIB_PUBLIC_HEADERS ${LIB_PUBLIC_HEADERS} 
     56        ${HEADER_PATH}/api/Win32/GraphicsHandleWin32 
    5657        ${HEADER_PATH}/api/Win32/GraphicsWindowWin32 
    5758        ${HEADER_PATH}/api/Win32/PixelBufferWin32 
     
    8586        ADD_DEFINITIONS(-DUSE_DARWIN_CARBON_IMPLEMENTATION) 
    8687        SET(LIB_PUBLIC_HEADERS ${LIB_PUBLIC_HEADERS}  
     88            ${HEADER_PATH}/api/Carbon/GraphicsHandleCarbon 
    8789            ${HEADER_PATH}/api/Carbon/GraphicsWindowCarbon 
    8890            ${HEADER_PATH}/api/Carbon/PixelBufferCarbon 
     
    110112 
    111113        SET(LIB_PUBLIC_HEADERS ${LIB_PUBLIC_HEADERS} 
     114            ${HEADER_PATH}/api/X11/GraphicsHandleX11 
    112115            ${HEADER_PATH}/api/X11/GraphicsWindowX11 
    113116            ${HEADER_PATH}/api/X11/PixelBufferX11 
     
    118121            PixelBufferX11.cpp 
    119122        ) 
    120  
     123         
    121124        IF(OSGVIEWER_USE_XRANDR) 
    122125            ADD_DEFINITIONS(-DOSGVIEWER_USE_XRANDR)