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sdl2: add shared context by implementing sdl_ctx_bind_hw_render #18330

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sdl2: add shared context by implementing sdl_ctx_bind_hw_render #18330

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36 changes: 35 additions & 1 deletion gfx/drivers_context/sdl_gl_ctx.c
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Original file line number Diff line number Diff line change
Expand Up @@ -42,6 +42,7 @@ typedef struct gfx_ctx_sdl_data
#ifdef HAVE_SDL2
SDL_Window *win;
SDL_GLContext ctx;
SDL_GLContext shared_ctx;
#else
SDL_Surface *win;
#endif
Expand All @@ -67,10 +68,14 @@ static void sdl_ctx_destroy_resources(gfx_ctx_sdl_data_t *sdl)
if (sdl->ctx)
SDL_GL_DeleteContext(sdl->ctx);

if (sdl->shared_ctx)
SDL_GL_DeleteContext(sdl->shared_ctx);

if (sdl->win)
SDL_DestroyWindow(sdl->win);

sdl->ctx = NULL;
sdl->shared_ctx = NULL;
#else
if (sdl->win)
SDL_FreeSurface(sdl->win);
Expand Down Expand Up @@ -423,6 +428,35 @@ static uint32_t sdl_ctx_get_flags(void *data)
static bool sdl_ctx_suppress_screensaver(void *data, bool enable) { return false; }
static void sdl_ctx_set_flags(void *data, uint32_t flags) { }

static void sdl_ctx_bind_hw_render(void *data, bool enable)
{
#ifdef HAVE_SDL2
gfx_ctx_sdl_data_t *sdl = (gfx_ctx_sdl_data_t*)data;
if (!sdl || !sdl->win || !sdl->ctx)
return;

if (enable)
{
if (!sdl->shared_ctx)
{
SDL_GL_SetAttribute(SDL_GL_SHARE_WITH_CURRENT_CONTEXT, 1);
SDL_GL_MakeCurrent(sdl->win, sdl->ctx);
sdl->shared_ctx = SDL_GL_CreateContext(sdl->win);
if (!sdl->shared_ctx)
{
RARCH_ERR("[SDL_GL]: Failed to create shared GL context: %s\n", SDL_GetError());
return;
}
}
SDL_GL_MakeCurrent(sdl->win, sdl->shared_ctx);
}
else
{
SDL_GL_MakeCurrent(sdl->win, sdl->ctx);
}
#endif
}

const gfx_ctx_driver_t gfx_ctx_sdl_gl =
{
sdl_ctx_init,
Expand Down Expand Up @@ -453,7 +487,7 @@ const gfx_ctx_driver_t gfx_ctx_sdl_gl =
"gl_sdl",
sdl_ctx_get_flags,
sdl_ctx_set_flags,
NULL, /* bind_hw_render */
sdl_ctx_bind_hw_render,
NULL,
NULL
};
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