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[SDL] Minimize number of system calls when handling WM_INPUT raw input messages. 

Details:
Currently doing 4 system calls per WM_INPUT message, which can cause the thread handling the message loop to be swapped out several times:
* GetProp - to get window data from the window handle
* GetRawInputData - to retrieve the raw input data
* 2 calls to GetMessageExtraInfo - to ignore synthetic mouse events generated for touchscreens

In this change:
* Replaced GetProp by iterating the list of windows maintained by SDL (with a fallback to GetProp). Note that this will affect all messages and not just WM_INPUT
* only calling GetMessageExtraInfo if a touchscreen has been detected

Fix for https://jira.valve.org/browse/CSGO-4855
@saml
This commit is contained in:
Sam Lantinga 2021-05-21 09:45:08 -07:00
parent dbbc725f5e
commit 157c3f8097
3 changed files with 24 additions and 3 deletions
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0
build-scripts/config.guess vendored Executable file → Normal file
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0
build-scripts/config.sub vendored Executable file → Normal file
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25
src/video/windows/SDL_windowsevents.c
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@ -428,6 +428,23 @@ static SDL_MOUSE_EVENT_SOURCE GetMouseMessageSource()
return SDL_MOUSE_EVENT_SOURCE_MOUSE;
}
static SDL_WindowData *
WIN_GetWindowDataFromHWND(HWND hwnd)
{
SDL_VideoDevice *_this = SDL_GetVideoDevice();
SDL_Window *window;
if (_this) {
for (window = _this->windows; window; window = window->next) {
SDL_WindowData *data = (SDL_WindowData *)window->driverdata;
if (data && data->hwnd == hwnd) {
return data;
}
}
}
return NULL;
}
LRESULT CALLBACK
WIN_KeyboardHookProc(int nCode, WPARAM wParam, LPARAM lParam)
{
@ -510,7 +527,11 @@ WIN_WindowProc(HWND hwnd, UINT msg, WPARAM wParam, LPARAM lParam)
}
/* Get the window data for the window */
data = WIN_GetWindowDataFromHWND(hwnd);
if (!data) {
/* Fallback */
data = (SDL_WindowData *) GetProp(hwnd, TEXT("SDL_WindowData"));
}
if (!data) {
return CallWindowProc(DefWindowProc, hwnd, msg, wParam, lParam);
}
@ -693,8 +714,8 @@ WIN_WindowProc(HWND hwnd, UINT msg, WPARAM wParam, LPARAM lParam)
/* Mouse data (ignoring synthetic mouse events generated for touchscreens) */
if (inp.header.dwType == RIM_TYPEMOUSE) {
if (GetMouseMessageSource() == SDL_MOUSE_EVENT_SOURCE_TOUCH ||
(GetMessageExtraInfo() & 0x82) == 0x82) {
if (SDL_GetNumTouchDevices() > 0 &&
(GetMouseMessageSource() == SDL_MOUSE_EVENT_SOURCE_TOUCH || (GetMessageExtraInfo() & 0x82) == 0x82)) {
break;
}
if (isRelative) {