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vector to raster

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I am developing system to convert vector coordinates to raster (pixel data). My Linux platform is very limited. I can not use X-Server (GLX extension), probably not GL_EXT_framebuffer_object. simply opengl 1.5. I guess I need to render (off screen into memory) from the coordinates (mostly polygons, lines and points) and extract pixel data (may be I can use glReadPixels). How can i go about developing this system. (using C++). Suggestions are appreciated.

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