Hi Antonio On Thu, Jun 8, 2023 at 1:33 PM Antonio Caggiano <quic_acagg...@quicinc.com> wrote:
> Hi Marc-André, > > On 07/06/2023 12:21, Marc-André Lureau wrote: > > Hi Antonio > > > > On Wed, Jun 7, 2023 at 1:05 PM Antonio Caggiano < > quic_acagg...@quicinc.com> > > wrote: > > > >> Add the SDL_WINDOW_ALLOW_HIGHDPI flag when creating a window and get the > >> drawable size instead of the window size when setting up the framebuffer > >> and the viewport. > >> > >> > > What does this actually change? > > The sdl2-gl backend does not work properly on high-DPI windows. [0] > My understanding is that by allowing high-DPI, SDL creates a framebuffer > with the right size in pixels which might be different than the size of > the window. [1] > I believe we just need to use the framebuffer size for GL viewport and > texture, by retrieving it with SDL_GL_GetDrawableSize. > > > What about non-gl display, Mouse motion, and display resize? > > From what I can see by testing the SDL2 renderer, it seems to handle > all of this transparently, so there is nothing we need to do in sdl2-2d. > > Same for mouse motion, which I believe is using window "screen > coordinates". > > Display resize is a bit weird for a bunch of frames, but then it fixes > itself. > > [0] > > https://user-images.githubusercontent.com/6058008/244368628-329241dc-267d-452f-b8ce-816ae1623131.png I am using SDL2-2.26.3-1.fc38.x86_64 on wayland, and it doesn't have this issue. Your patch doesn't seem to change the behaviour. Maybe there is something to investigate at SDL level instead. btw, "allow hi-dpi" isn't a good description imho, since the guest still doesn't receive real physical hi-dpi details of the client, and remains scaled-up. > > [1] https://wiki.libsdl.org/SDL2/SDL_GetWindowSize#remarks > > > > > thanks > > > > Signed-off-by: Antonio Caggiano <quic_acagg...@quicinc.com> > >> --- > >> ui/sdl2-gl.c | 4 ++-- > >> ui/sdl2.c | 2 +- > >> 2 files changed, 3 insertions(+), 3 deletions(-) > >> > >> diff --git a/ui/sdl2-gl.c b/ui/sdl2-gl.c > >> index bbfa70eac3..251b7d56d6 100644 > >> --- a/ui/sdl2-gl.c > >> +++ b/ui/sdl2-gl.c > >> @@ -53,7 +53,7 @@ static void sdl2_gl_render_surface(struct sdl2_console > >> *scon) > >> SDL_GL_MakeCurrent(scon->real_window, scon->winctx); > >> sdl2_set_scanout_mode(scon, false); > >> > >> - SDL_GetWindowSize(scon->real_window, &ww, &wh); > >> + SDL_GL_GetDrawableSize(scon->real_window, &ww, &wh); > >> surface_gl_setup_viewport(scon->gls, scon->surface, ww, wh); > >> > >> surface_gl_render_texture(scon->gls, scon->surface); > >> @@ -239,7 +239,7 @@ void sdl2_gl_scanout_flush(DisplayChangeListener > *dcl, > >> > >> SDL_GL_MakeCurrent(scon->real_window, scon->winctx); > >> > >> - SDL_GetWindowSize(scon->real_window, &ww, &wh); > >> + SDL_GL_GetDrawableSize(scon->real_window, &ww, &wh); > >> egl_fb_setup_default(&scon->win_fb, ww, wh); > >> egl_fb_blit(&scon->win_fb, &scon->guest_fb, !scon->y0_top); > >> > >> diff --git a/ui/sdl2.c b/ui/sdl2.c > >> index 9d703200bf..c9c83815ca 100644 > >> --- a/ui/sdl2.c > >> +++ b/ui/sdl2.c > >> @@ -95,7 +95,7 @@ void sdl2_window_create(struct sdl2_console *scon) > >> } > >> #ifdef CONFIG_OPENGL > >> if (scon->opengl) { > >> - flags |= SDL_WINDOW_OPENGL; > >> + flags |= SDL_WINDOW_OPENGL | SDL_WINDOW_ALLOW_HIGHDPI; > >> } > >> #endif > >> > >> -- > >> 2.40.0 > >> > >> > > > > Cheers, > Antonio > > -- Marc-André Lureau
