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[client] update viewport size after window is created

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Make sure glViewport gets called as soon as we know the window
dimensions, otherwise nothing gets rendered until KVMFR communication is
established (mostly the splash).

Without the fix, './looking-glass-client -s' behaves differently than
'./looking-glass-client -s -F' in that the latter triggers a
SDL_WINDOWEVENT_SIZE_CHANGED and updates the viewport immediately after
window creation while the former doesn't and all rendering is delayed
until the frameThread successfully decodes the first frame.

As all the possible ways of updating the viewport (window creation,
window size change, frame size change) are covered with
updatePositionInfo(), the 'started' state becomes redundant and is
removed.

Note: this might be the wrong way to fix it (possible driver bug?),
glViewport's specification mentions that the default viewport size
matches the window size when the GL context is first attached.

Tested on:

Debian Buster with GNOME 3.30.2 on X.Org 1.20.3
Looking Glass (a12-21-g07e4c1c20f)
Locking Method: Atomic
Using: EGL
Vendor  : Intel Open Source Technology Center
Renderer: Mesa DRI Intel(R) Haswell Desktop
Version : OpenGL ES 3.1 Mesa 18.3.2

Signed-off-by: Marius Barbu <msb@avengis.com>
This commit is contained in:
Marius Barbu 2019-02-20 20:58:07 +02:00 committed by Geoffrey McRae
parent 07e4c1c20f
commit e09ff31c09
1 changed files with 3 additions and 6 deletions
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9
client/main.c
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@ -46,7 +46,6 @@ Place, Suite 330, Boston, MA 02111-1307 USA
struct AppState
{
bool running;
bool started;
bool keyDown[SDL_NUM_SCANCODES];
bool haveSrcSize;
@ -453,11 +452,6 @@ int frameThread(void * unused)
}
++state.frameCount;
if (!state.started)
{
state.started = true;
updatePositionInfo();
}
}
state.running = false;
@ -885,6 +879,9 @@ int run()
// ensure the initial window size is stored in the state
SDL_GetWindowSize(state.window, &state.windowW, &state.windowH);
// ensure renderer viewport is aware of the current window size
updatePositionInfo();
// set the compositor hint to bypass for low latency
SDL_SysWMinfo wminfo;
SDL_VERSION(&wminfo.version);