Instead of getting a a verbatim copy of the frame-buffer by way of a
copy using glReadPixels(), I would like rather, a scaled down version
of frame-buffer image.
But! I would all my scaling handled by my GPU. Sound simple enough
right?
I'm using the capture method exactly as it is in the old glGrab project
Sample Code example. (was on the apple developer web-site... not there
anymore?)
any ideas?
-----------
I've got something like this currently:
CGLSetCurrentContext( glContextObj ) ;
glReadBuffer(GL_FRONT);
glGetIntegerv(GL_VIEWPORT, viewport);
glFinish(); /* Finish all OpenGL commands */
glPixelStorei(GL_PACK_ALIGNMENT, 4); /* Force 4-byte alignment */
glPixelStorei(GL_PACK_ROW_LENGTH, 0);
glPixelStorei(GL_PACK_SKIP_ROWS, 0);
glPixelStorei(GL_PACK_SKIP_PIXELS, 0);
/*
* By matching the framebuffer format, we can get the
* data transferred to our buffer using DMA.
*/
glReadPixels(0, 0, width, height,
GL_BGRA,
GL_UNSIGNED_INT_8_8_8_8_REV,
[bitmap bitmapData]);
Thanks!
Simon.
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