Use the normal state changed `HookableEvent` instead of having
`Core::NotifyStateChanged` call `g_perf_metrics.OnEmulationStateChanged`
directly.
The direct call was added in bad78cfed4 to
avoid a crash. At the time state changed callbacks were stored in a
vector, and the crash was caused by `g_perf_metric`'s destructor trying
to remove the callback from the already-destroyed vector.
Later a97627e736 switched state changed
callbacks to use `HookableEvent`, which is specifically designed to
handle the case where a hook outlives its associated event.
Since the workaround is no longer necessary replace it with a standard
`EventHook`.
Add a minimum value for the automatic size of the performance metrics
graph. The graph can still be manually resized smaller than this limit.
This prevents the graph from automatically resizing itself to be too
small to contain the full graph and legend, which happened when using
native resolution with `Auto-Adjust Window Size` enabled.
Fix a bug causing the performance graph to not resize when the render
window changed size:
* When changing the render window size during emulation the performance
graph wouldn't update its size until the next emulation session.
* When changing the render window size with no emulation active (by
changing the Internal Resolution with Auto-Adjust Window Size enabled)
the performance graph wouldn't update its size until the second
emulation session after the change.
Before explaining why the bug happened, here are some details about Dear
ImGui (henceforth ImGui) for context:
* In order to allow programs to specify initial ImGui window sizes while
also allowing the user to resize them, `SetNextWindowSize` takes a
flag from the `ImGuiCond_` enum specifying under what circumstances
that function should actually have any effect.
* ImGuiCond_FirstUseEver causes ImGui to only apply the command when the
window doesn't have any saved size information for that session or in
the ini file specified by `ImGui::GetIO().IniFilename`. Since we set
that filename to `nullptr`, in practice the resize command is applied
on the first frame of each ImGui/emulation session.
* Qt saves the most recent size of the render window across emulation
(and even Dolphin) sessions, which is then used to set the initial
value of `ImGui::GetIO().DisplaySize` in the next emulation session.
* It takes multiple frames for the size of the render window to update
when changed by setting the internal resolution. This means that
`ImGui::GetIO().DisplaySize` will have a stale value in the
intervening frames, and specifically for the first few frames of
emulation if the resolution was changed beforehand.
When changing the resolution during emulation the call to
`SetNextWindowSize` had no effect because of the
`ImGuiCond_FirstUseEver` flag. `DisplaySize` would be updated several
frames later, and then the next emulation session would update the graph
size on its first frame.
When changing the resolution outside emulation and then starting a game,
the call to SetNextWindowSize on the first frame took effect but used
the stale value of `DisplaySize`. `DisplaySize` would be updated a few
frames later, but the graph wouldn't be resized until the first frame of
the second emulation session.
This commit fixes the issue by using the `ImGuiCond_Always` flag in the
performance graph's call to `SetNextWindowSize` when the render window
size changes.
Previously, PerformanceTracker registered a callback to be updated on
emulation state changes. PerformanceTrackers live in a global variable
(g_perf_metrics) within libvideocommon. The callback was stored in a
global variable in libcore. This created a race condition at shutdown
between these libraries, when the PerfTracker's destructor tried to
unregister the callback.
Notify the PerfTracker directly from libcore, without callbacks, since
Core.cpp already references g_perf_metrics explicitly. Also rename
Core::CallOnStateChangedCallbacks to NotifyStateChanged to better
reflect what it's doing.
Fix overlays stacking on top of each other or not moving to the edge of
the screen when enabling or disabling overlays while emulation is
active.
This change only applies when Config::GFX_MOVABLE_PERFORMANCE_METRICS is
False.
Clamp overlays to the render window (with some padding), reset their
positions when the render window changes sizes, and add a setting to
enable moving the overlays (off by default, .ini only for now).
Move ImGui::End() calls out of if(ImGui::Begin()) blocks.
Quoting from ImGui::Begin's function comment in imgui.cpp:
"You always need to call ImGui::End() even if false is returned."
In practice this didn't cause problems because the windows don't have
title bars and thus can't be collapsed, and so the block containing
::End would always run, but let's do it the right way.
