Previously there were a few sinks based on OpenGL (osxvideosink for Mac OS X and eglglessink for Android and iOS), but they all only allowed rendering to a window. They did not allow rendering of a video into a custom texture that is then composited inside the application into an OpenGL scene. And then there was gst-plugins-gl, which allowed more flexible handling of OpenGL inside GStreamer pipelines, including uploading and downloading of video frames to the GPU, provided various filters and base classes to easily implement shader-based filters, provided infrastructure for sharing OpenGL contexts between different elements (even if they run in different threads) and also provided a video sink. The latter was now improved a lot, ported to all the new features for hardware integration and finally merged into gst-plugins-bad. Starting with GStreamer 1.4 in a few weeks, OpenGL will be a first-class citizen in GStreamer pipelines.
After yesterday’s addition of EAGL support for iOS (EAGL is Apple’s iOS API for handling GLES contexts), there is nothing missing to use this new set of library and plugins on all platforms supported by GStreamer. And finally we can get rid of eglglessink, which was only meant as an intermediate solution until we have all the infrastructure for real OpenGL support.