On Sat, Mar 28, 2015 at 6:57 AM, x414e54 <<a href="mailto:x414e54@linux.com">x414e54@linux.com</a>> wrote: > I am attempting to pass a GL_TEXTURE_2D directly to a Wayland compositor by > first converting it so an EGLImageKHR and then to a wl_buffer. > > eglCreateImageKHR appears to work fine but when calling > glCreateWaylandBufferFromImageWL I get EGL_BAD_MATCH "unsupported image > format". > > The GL_TEXTURE_2D is in GL_RGBA format. > > Is this going to be possible or should I look for an alternative way? I wouldn't expect this to work at all in general. The glCreateWaylandBufferFromImageWL extension was initially created for nested compositor. The intention was to take buffers recieved by a nested compositor from Wayland client and then hand them directly off to the parent compositor. In other words, the buffers were something that already came from a Wayland client and so handing them off across the Wayland protocol was always safe. This was never intended for passing around arbitrary EGLImages. Why not? There may be all sorts of tiling, stride, and color format restrictions required by the compositor half of the graphics stack that may not be required for a texture. For instance, if you want to be able to scan out from the buffer directly, the restrictions are usually fairly heavy. How can you do this? One way would be to use GBM to allocate your buffer and then import it into egl to render and then talk the wl_drm protocol directly. However, this is far more complicated than you probably want and, while it will work with mesa, it is not a general solution. If you gave a more high-level description of what you are trying to do, I may be able to help better. It's quite possible that there is a fairly simple way to do it. > I was originally blitting the texture to the default framebuffer and then > trying to use eglSwapBuffers. But for some reason eglSwapBuffers was > returning EGL_BAD_SURFACE even though eglMakeCurrent had no errors. Can you render to it? That sounds like something is wrong in the way you're setting up your EGLSurface. Of you can render you should be able to blit. --Jason