54685787ca
Robert Turner
SDL_windowsevents.c contains code to retrieve the x and y coordinate for a requested hit test. It does this as follows:
POINT winpoint = { (int) LOWORD(lParam), (int) HIWORD(lParam) };
LOWORD(lParam) does not correctly mask off high bits that are set if the point is on a second (or third, etc.) monitor. This effectively offsets the x-coordinate by a large value.
MSDN documentation suggests that LOWORD() and HIWORD() are the wrong macros for the task, instead suggesting we should be doing something like the following:
POINT winpoint = { GET_X_LPARAM(lParam), GET_Y_LPARAM(lParam) };
Testing this change on my Windows 10 machine with 2 monitors gives the correct results.
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| VisualC | ||
| VisualC-WinRT | ||
| Xcode | ||
| Xcode-iOS | ||
| acinclude | ||
| android-project | ||
| build-scripts | ||
| cmake | ||
| debian | ||
| docs | ||
| include | ||
| src | ||
| test | ||
| visualtest | ||
| .hgignore | ||
| Android.mk | ||
| BUGS.txt | ||
| CMakeLists.txt | ||
| COPYING.txt | ||
| CREDITS.txt | ||
| INSTALL.txt | ||
| Makefile.in | ||
| Makefile.minimal | ||
| Makefile.pandora | ||
| Makefile.psp | ||
| Makefile.wiz | ||
| README-SDL.txt | ||
| README.txt | ||
| SDL2.spec.in | ||
| SDL2Config.cmake | ||
| TODO.txt | ||
| VisualC.html | ||
| WhatsNew.txt | ||
| autogen.sh | ||
| cmake_uninstall.cmake.in | ||
| configure | ||
| configure.in | ||
| sdl2-config.cmake.in | ||
| sdl2-config.in | ||
| sdl2.m4 | ||
| sdl2.pc.in | ||
README.txt
Simple DirectMedia Layer (SDL) Version 2.0 --- https://www.libsdl.org/ Simple DirectMedia Layer is a cross-platform development library designed to provide low level access to audio, keyboard, mouse, joystick, and graphics hardware via OpenGL and Direct3D. It is used by video playback software, emulators, and popular games including Valve's award winning catalog and many Humble Bundle games. More extensive documentation is available in the docs directory, starting with README.md Enjoy! Sam Lantinga (slouken@libsdl.org)