392cfb493a
This extension is the GLES equivalent of the GL_EXT_framebuffer_blit extension except that it has some extra restrictions. We need to check for some extension that provides glBlitFramebuffer so that we can unconditionally use ctx->drv.pf_glBlitFramebuffer in both GL and GLES code. Even with the restrictions, the extension provides enough features for what Cogl needs.