The biggest disadvantage of OpenVG is that it is a whole new surface of contact with drivers. We're only just now digesting the surface of OpenGL and gralloc drivers, in terms of driver bugs and other device-dependent behavior. So the prospect of throwing OpenVG into the mix is scary and unexciting, and so the bar has to be very high. In addition to performance comparisons I would have to hear a good reason to believe that OpenGL+software can't be as fast as OpenVG -- is it because OpenGL doesn't efficiently expose the hardware features, or is it because there is OpenVG-specific hardware?
Benoit 2013/2/23 Andreas Gal <g...@mozilla.com> > > OpenVG is a Khronos standard API for GPU accelerated 2D rendering. Its > very similar to OpenGL in design. In fact, its an alternative API to OpenGL > ES on top of EGL. It looks like that OpenVG is supported on most Android > devices and is used there by Flash (or well used to be used). B2G devices > have OpenVG support as well. There are also a number of open source > implementations of OpenVG that use OpenGL to accelerate 2D operations that > might be interesting for the desktop. OpenVG is pretty similar to Cairo and > Skia when it comes to the actual operations offered. The biggest drawback > of OpenVG is that it doesn't mix well with OpenGL. Its possible to render > with OpenVG to a texture and then composite that with OpenGL, but its not > possible to do mixed rendering with VG and GL to the same surface. That > having said, I still think we should consider adding an OpenVG backend. It > would potentially significantly speed up rendering on mobile hardware. > OpenVG is quite a bit more seasoned t > han Skia/SkiaGL, and explicitly targets mobile, whereas SkiaGL seems to > be mostly optimized for the desktop (at least so far). A particular > advantage of OpenVG is that it can take advantage of dedicated 2D > acceleration hardware (Mali and Adreno both have special 2D hardware OpenVG > uses). SkiaGL on the other hand is limited to using GLES to accelerate 2D > drawing operations. What do people think. Should we add a OpenVG backed? > > Andreas > _______________________________________________ > dev-platform mailing list > dev-platform@lists.mozilla.org > https://lists.mozilla.org/listinfo/dev-platform > _______________________________________________ dev-platform mailing list dev-platform@lists.mozilla.org https://lists.mozilla.org/listinfo/dev-platform
