I want to capture video-stream from my isight-cam and render some
OpenGL polygons on the video-stream, so that I actualy see both
video-stream and the rendered object. The difference is that I don't
use GLUT but AGL and a carbon-window to draw on. So far I have done the
following steps being inspired by ARToolKit implementation:
- creating new GWorldPtr using QTNewGWorld with k32ARGBPixelFormat
- calling the usual SG routines (SGInitialize, SGSetDataRef,
SGSetGWolrd, SGNewChannel, SGSetChannelBounds, SGSetChannelUsage,
SGSetDataProc , SGStartRecord)
- creating an AGLPixelFormat with the attributes: { AGL_RGBA,
AGL_DOUBLEBUFFER, AGL_STENCIL_SIZE, 8, AGL_SAMPLE_BUFFERS_ARB, 1,
AGL_SAMPLES_ARB, 4, AGL_NO_RECOVERY, AGL_NONE }
- creating AGLContext on that pixFmt
- saving current graphics-port to carbon-window port
- aglSetDrawable and aglSetCurrentContext
- initializing GL by aglSetCurrentContext, glMatrixMode(GL_MODELVIEW),
glLoadIdentity(), glMatrixMode(GL_PROJECTION), glLoadIdentity(),
glOrtho(...), glViewPort(...), glDisable(GL_STENCIL_TEST),
glStencilFunc(GL_ALWAYS, 0, 0), glStencilOp(GL_KEEP, GL_KEEP, GL_KEEP)
- GetPixBaseAddress from the created GWorldPtr and drawing it by using
glDrawPixels periodicaly in an EventLoopTimer
- aglSwapBuffers
At this point I see the video-stream on the carbon-window but I have
problems rendering a simple 2d quad on the window simultaneously.
What I tried after the swapBuffers call was:
- glMatrixMode(GL_MODELVIEW)
- glLoadIdentity();
- glCallList(simpleQuad) (I have created a list with 4 vertices)
- aglSwapBuffers
But the I just see the Quad and no video-stream anymore.
I'm not that experienced with OpenGL (so please don't destroy me
completely;)), especially not in using different bufffers like stencil
and depthbuffer. I was so happy if you could give me any hints.
Thanks a lot!!
Milo
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