Thanks for the responses.
Using a PixelBufferObject did not appear to make any difference in performance
for me. My video hardware only supports OpenGL 1.5, so that is probably the
reason.
I suspect the power of two issue is the cause of my performance problem. When
I create a 640x480 image I get a console message that it is being scaled to
512x512. However, when I try to create a 512x512 image instead, I get an error
message "Detected OpenGL error 'invalid enumerant' at After Renderer::compile".
This is before I even attempt to load any video data into the image. What
does this error mean?
Here is the code:
int pixelsX = 640;
int pixelsY = 480;
int bytesPerPixel = 4;
rawData = new unsigned char[pixelsX * pixelsY * bytesPerPixel];
memset(rawData, 0xFF, (pixelsX * pixelsY * bytesPerPixel));
setImage(
pixelsX, // width
pixelsY, // height
1, // depth
GL_RGB8, // internal texture format
GL_BGRA, // pixel format
GL_UNSIGNED_INT_8_8_8_8, // data type
rawData, // raw data
osg::Image::NO_DELETE); // memory allocation mode
Using 640x480 (which gets scaled to 512x512) I get a white quad, as I expect.
However, if I use 512x512 image, I see distorted green lines with a black
background on the quad, along with the error. If I try to load any video data
at this point, the program crashes.
I also have the option of using a video frame of 8 bits per pixel (for a
greyscale image) but I have not been able to see the image at all in that case.
I tried using the GL_LUMINANCE pixel format and GL_UNSIGNED_BYTE data type,
along with a few other combinations, but nothing has worked so far.
------------------
Read this topic online here:
http://forum.openscenegraph.org/viewtopic.php?p=45956#45956
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