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Backends: Win32: minor optimization not submitting gamepad input if packet number has not changed. (#8556)

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To be honest I don't believe this is valuable as an optimization, but it makes debug stepping a little nicer.
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ocornut
2025-09-23 16:29:30 +02:00
parent d701ffb478
commit 5f6eaa5278
2 changed files with 7 additions and 0 deletions
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5
backends/imgui_impl_win32.cpp
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@@ -21,6 +21,7 @@
// CHANGELOG
// (minor and older changes stripped away, please see git history for details)
// 2025-09-23: Inputs: Minor optimization not submitting gamepad input if packet number has not changed.
// 2025-09-18: Call platform_io.ClearPlatformHandlers() on shutdown.
// 2025-04-30: Inputs: Fixed an issue where externally losing mouse capture (due to e.g. focus loss) would fail to claim it again the next subsequent click. (#8594)
// 2025-03-10: When dealing with OEM keys, use scancodes instead of translated keycodes to choose ImGuiKey values. (#7136, #7201, #7206, #7306, #7670, #7672, #8468)
@@ -124,6 +125,7 @@ struct ImGui_ImplWin32_Data
HMODULE XInputDLL;
PFN_XInputGetCapabilities XInputGetCapabilities;
PFN_XInputGetState XInputGetState;
DWORD XInputPacketNumber;
#endif
ImGui_ImplWin32_Data() { memset((void*)this, 0, sizeof(*this)); }
@@ -355,6 +357,9 @@ static void ImGui_ImplWin32_UpdateGamepads(ImGuiIO& io)
if (!bd->HasGamepad || bd->XInputGetState == nullptr || bd->XInputGetState(0, &xinput_state) != ERROR_SUCCESS)
return;
io.BackendFlags |= ImGuiBackendFlags_HasGamepad;
if (bd->XInputPacketNumber != 0 && bd->XInputPacketNumber == xinput_state.dwPacketNumber)
return;
bd->XInputPacketNumber = xinput_state.dwPacketNumber;
#define IM_SATURATE(V) (V < 0.0f ? 0.0f : V > 1.0f ? 1.0f : V)
#define MAP_BUTTON(KEY_NO, BUTTON_ENUM) { io.AddKeyEvent(KEY_NO, (gamepad.wButtons & BUTTON_ENUM) != 0); }