Re: [forum] xfree will be the best....
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Around 12 o'clock on Apr 6, Marco Bubke wrote: > How difficult would it be to layer Render over OpenGL? I really don't > know render but it looks to me a little bit like the classic OpenGL > raster stage. That shouldn't be surprising; the intent was to make hardware that supports OpenGL able to accelerate most of the Render extension. However, there are a few operations which OpenGL doesn't efficiently accelerate in some implementations, most notably the text operations which dominate most 2D interfaces and rendering to off-screen images (pbuffers). In addition, Render includes per-component (RGBA) compositing to improve image quality on LCD screens and a few new compositing modes needed for interactive applications. The compositing modes should be largely compatible with OpenGL, but the component-level compositing has no equivalent in the OpenGL world that I'm aware of. Hence, any Render implementation is likely to include at least some software component that touches the raw pixels for the forseeable future which is difficult to do through OpenGL. -keith
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