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ANGLE extensions are only provided by Google's Almost Native Graphics Layer Engine (ANGLE) implementation. Therefore they do not seem too useful for Mutter. The reason to drop GL_ANGLE_framebuffer_blit support is that it has more limitations compared to the glBlitFramebuffer in GL_EXT_framebuffer_blit, GL_NV_framebuffer_bit, OpenGL 3.0 and OpenGL ES 3.0. Most importantly, the ANGLE version cannot flip the image while copying, which limits _cogl_blit_framebuffer to only off-screen <-> off-screen copies. Follow-up work will need off-screen <-> on-screen copies. Instead of adding yet more capability flags to Cogl, dropping ANGLE support seems appropriate. The NV extension is added to the list of glBlitFramebuffer providers because it provides the same support as ANGLE and more. Likewise OpenGL ES 3.0 is added to the list of glBlitFramebuffer providers because e.g. Mesa GLES implementation usually provides it and that makes it widely available, again surpassing the ANGLE supported features. Follow-up patches will lift some of the Cogl assumptions of what glBlitFramebuffer cannot do. https://gitlab.gnome.org/GNOME/mutter/merge_requests/615 |
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| .. | ||
| cogl-all-functions.h | ||
| cogl-core-functions.h | ||
| cogl-fixed-functions.h | ||
| cogl-gles2-functions.h | ||
| cogl-glsl-functions.h | ||
| cogl-in-gles2-core-functions.h | ||
| cogl-in-gles-core-functions.h | ||