bool Engine::shouldRender()
{
if (nv_app_status_interactable(mApp))
{
if (!mEGL->isReadyToRender(true))
return false;
bool redraw = mRedraw;
if (mForceRender > 0)
{
mForceRender--;
redraw = true;
}
mRedraw = false;
return redraw;
}
else
{
mRedraw = false;
// Even if we are not interactible, we may be visible, so we
// HAVE to do any forced renderings if we can. We must also
// check for resize, since that may have been the point of the
// forced render request in the first place!
if ((mForceRender > 0) && mEGL->isReadyToRender(false))
{
mForceRender--;
return true;
}
}
return false;
}
/**
* This is the main entry point of a native application that is using
* android_native_app_glue. It runs in its own thread, with its own
* event loop for receiving input events and doing other things.
*/
void android_main(struct android_app* app)
{
// Make sure glue isn't stripped.
app_dummy();
NvEGLUtil* egl = NvEGLUtil::create();
if (!egl)
{
// if we have a basic EGL failure, we need to exit immediately; nothing else we can do
nv_app_force_quit_no_cleanup(app);
return;
}
Engine* engine = new Engine(*egl, app);
long lastTime = egl->getSystemTime();
// loop waiting for stuff to do.
while (nv_app_status_running(app))
{
// Read all pending events.
int ident;
int events;
struct android_poll_source* source;
// If not rendering, we will block forever waiting for events.
// If animating, we loop until all events are read, then continue
// to draw the next frame of animation.
while ((ident = ALooper_pollAll(((nv_app_status_focused(app) &&
engine->isGameplayMode()) ? 1 : 250),
NULL,
&events,
(void**)&source)) >= 0)
{
// If we timed out, then there are no pending messages
if (ident == ALOOPER_POLL_TIMEOUT)
break;
// Process this event.
if (source != NULL)
source->process(app, source);
// Check if we are exiting. If so, dump out
if (!nv_app_status_running(app))
break;
engine->looperIteration(ident);
}
long currentTime = egl->getSystemTime();
// clamp time - it must not go backwards, and we don't
// want it to be more than a half second to avoid huge
// delays causing issues. Note that we do not clamp to above
// zero because some tools will give us zero delta
long deltaTime = currentTime - lastTime;
if (deltaTime < 0)
deltaTime = 0;
else if (deltaTime > 500)
deltaTime = 500;
lastTime = currentTime;
// Update the frame, which optionally updates time and animations
// and renders
engine->updateFrame(nv_app_status_interactable(app), deltaTime);
}
delete engine;
delete egl;
}
