sdl2: add shared context by implementing sdl_ctx_bind_hw_render

[cscd98]

Description

When using RETRO_ENVIRONMENT_SET_HW_SHARED_CONTEXT with sdl2 GL RetroArch will segfault. This is because bind_hw_render is NULL and is unimplemented.

Shared context is required for webOS for the dolphin emulator.

Tested on webOS 10 on a LG G4 TV running the in development dolphin port.

Also tested trying to use Play! emulator which also requires RETRO_ENVIRONMENT_SET_HW_SHARED_CONTEXT which also crashes.

Thread 1 received signal SIGSEGV, Segmentation fault.
0x00000000 in ?? ()
(gdb) bt
#0  0x00000000 in ?? ()
#1  0x0044a37c in gl2_renderchain_init_hw_render (gl=0x1019018, chain=0x17accb0 <EfbInterface::efb+769160>, width=1024, height=1024) at gfx/drivers/gl2.c:2013
#2  0x0044f508 in gl2_init (video=0xfffeebf8, input=0xd70594 <input_driver_st+644>, input_data=0xd70598 <input_driver_st+648>) at gfx/drivers/gl2.c:4575
#3  0x001b5dfc in video_driver_init_internal (video_is_threaded=0xfffeecda, verbosity_enabled=true) at gfx/video_driver.c:3620
#4  0x00022f40 in drivers_init (settings=0xe7ee78, flags=4095, lifetime_flags=0, verbosity_enabled=true) at retroarch.c:1561
#5  0x0002e97c in retroarch_main_init (argc=6, argv=0xfffef394) at retroarch.c:8055
#6  0x00177c20 in content_load (info=0xfffef1d0, p_content=0xd37c3c <runloop_state+1108>) at tasks/task_content.c:1442
#7  0x00179f58 in task_load_content_internal (content_info=0xfffef1d0, loading_from_menu=true, loading_from_cli=true, loading_from_companion_ui=false) at tasks/task_content.c:2608
#8  0x0017a0e8 in task_push_load_content_from_cli (core_path=0x0, fullpath=0x0, content_info=0xfffef1d0, type=CORE_TYPE_PLAIN, cb=0x0, user_data=0x0) at tasks/task_content.c:2704
#9  0x0002b40c in rarch_main (argc=6, argv=0xfffef394, data=0x0) at retroarch.c:6017
#10 0x0002b4bc in main (argc=6, argv=0xfffef394) at retroarch.c:618

Related Issues

webosbrew/retroarch-cores#13