[Qemu-devel] [RfC PATCH 0/3] sdl2: add opengl rendering support

[Gerd Hoffmann <kraxel@redhat.com>]

  Hi,

This series add support for screen rendering using opengl.  This only
blits classic DisplaySurfaces to the screen using opengl, it does not
(yet) enable gfx emulation use opengl for rendering.

It depends on the "sdl2: fixes, cleanups and opengl preparation"
series just posted.

The big question mark (and the reason this is RfC) is how we are going
to enable/disable opengl at runtime.  The options I see are:

 (1) make that a ui option, i.e. '-display sdl,opengl={on,off}'.
 (2) make that a global option, i.e. -opengl={on,off}

I'd tend to go for (2).

First, because we have a initialization order issue once gfx emulation
starts using opengl:  ui code is initialized after device code (and this
can't be changed easily because devices need register displays before we
init the ui).  Therefore with (1) the device emulation doesn't know at
init time time whenever opengl is available or not.

Second for the long term there will be 3d support in a number of UIs:
I expect sdl2, gtk, egl (using render nodes, for headless) and spice.
Having a global switch for them all looks easier.

Comments?
Other suggestions?

cheers,
  Gerd

Gerd Hoffmann (3):
  configure: opengl overhaul
  sdl2: add support for display rendering using opengl.
  sdl2: move SDL_* includes to sdl2.h

 configure                        |  39 +++++------
 default-configs/lm32-softmmu.mak |   2 +-
 hw/display/Makefile.objs         |   2 +-
 hw/lm32/milkymist-hw.h           |   4 +-
 include/ui/sdl2.h                |  17 +++++
 ui/Makefile.objs                 |   4 ++
 ui/sdl2-2d.c                     |  12 ++--
 ui/sdl2-gl.c                     | 136 +++++++++++++++++++++++++++++++++++++++
 ui/sdl2-input.c                  |   6 --
 ui/sdl2.c                        |  56 ++++++++++++----
 10 files changed, 227 insertions(+), 51 deletions(-)
 create mode 100644 ui/sdl2-gl.c

-- 
1.8.3.1