5e98ee5dbe
Instead of just adding the cogl header boilerplate, we'll redirect the
main function with #define and #undef to cogl_main(). The real main
calls the hooks-generated cogl_hooks() which chains up to the users
main() which is now called cogl_main().
<boilerplate>
#define main cogl_main
<user shader>
<hook functions>
void
cogl_hooks () {
cogl_main ();
<hook code>
}
#undef main
void main () { cogl_hooks(); }
This allows the user shader to continue using shaders which seem like
they define the main function and output to the framebuffer but also
gives the CoglPipeline a chance to add hooks.
This in particular makes our ClutterColorState transform hooks work on
user programs which are used by ClutterShaderEffects.
Closes: https://gitlab.gnome.org/GNOME/gnome-shell/-/issues/7804
Closes: https://gitlab.gnome.org/GNOME/gnome-shell/-/issues/7805
Closes: https://gitlab.gnome.org/GNOME/mutter/-/issues/3662
Part-of: <https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/4037>