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Backends: Win32: dynamically load XInput library
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Kuanlan authored and Kuanlan committed Dec 9, 2020
1 parent 17536f9 commit f3e83b2
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Showing 2 changed files with 75 additions and 38 deletions.
111 changes: 74 additions & 37 deletions backends/imgui_impl_win32.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -19,15 +19,9 @@
#include <windows.h>
#include <tchar.h>

// Using XInput library for gamepad (with recent Windows SDK this may leads to executables which won't run on Windows 7)
// Using XInput library for gamepad
#ifndef IMGUI_IMPL_WIN32_DISABLE_GAMEPAD
#include <XInput.h>
#else
#define IMGUI_IMPL_WIN32_DISABLE_LINKING_XINPUT
#endif
#if defined(_MSC_VER) && !defined(IMGUI_IMPL_WIN32_DISABLE_LINKING_XINPUT)
#pragma comment(lib, "xinput")
//#pragma comment(lib, "Xinput9_1_0")
#endif

// CHANGELOG
Expand Down Expand Up @@ -65,6 +59,11 @@ static ImGuiMouseCursor g_LastMouseCursor = ImGuiMouseCursor_COUNT;
static bool g_HasGamepad = false;
static bool g_WantUpdateHasGamepad = true;

// XInput Data
static HMODULE g_hXInputDLL = NULL;
DWORD (__stdcall *g_fXInputGetCapabilities)(DWORD, DWORD, XINPUT_CAPABILITIES*) = NULL;
DWORD (__stdcall *g_fXInputGetState)(DWORD, XINPUT_STATE*) = NULL;

// Functions
bool ImGui_ImplWin32_Init(void* hwnd)
{
Expand Down Expand Up @@ -104,12 +103,43 @@ bool ImGui_ImplWin32_Init(void* hwnd)
io.KeyMap[ImGuiKey_X] = 'X';
io.KeyMap[ImGuiKey_Y] = 'Y';
io.KeyMap[ImGuiKey_Z] = 'Z';


// Gamepad, dynamically load XInput library
#ifndef IMGUI_IMPL_WIN32_DISABLE_GAMEPAD
const wchar_t* xinput_dll_name[] = {
L"xinput1_4.dll", // Windows 8+
L"xinput1_3.dll", // DirectX SDK
L"xinput9_1_0.dll", // Windows xp, vista, 7...
};
typedef DWORD (__stdcall *f_XInputGetCapabilities)(DWORD, DWORD, XINPUT_CAPABILITIES*);
typedef DWORD (__stdcall *f_XInputGetState)(DWORD, XINPUT_STATE*);
for (size_t idx = 0; idx < 3; idx += 1)
{
HMODULE dll = LoadLibraryW(xinput_dll_name[idx]);
if (dll != NULL)
{
g_hXInputDLL = dll;
g_fXInputGetCapabilities = (f_XInputGetCapabilities)GetProcAddress(dll, "XInputGetCapabilities");
g_fXInputGetState = (f_XInputGetState)GetProcAddress(dll, "XInputGetState");
break;
}
}
#endif // IMGUI_IMPL_WIN32_DISABLE_GAMEPAD

return true;
}

void ImGui_ImplWin32_Shutdown()
{
// Gamepad, unload XInput library
#ifndef IMGUI_IMPL_WIN32_DISABLE_GAMEPAD
g_fXInputGetCapabilities = NULL;
g_fXInputGetState = NULL;
if (g_hXInputDLL)
FreeLibrary(g_hXInputDLL);
g_hXInputDLL = NULL;
#endif // IMGUI_IMPL_WIN32_DISABLE_GAMEPAD

g_hWnd = (HWND)0;
}

Expand Down Expand Up @@ -175,43 +205,50 @@ static void ImGui_ImplWin32_UpdateGamepads()
memset(io.NavInputs, 0, sizeof(io.NavInputs));
if ((io.ConfigFlags & ImGuiConfigFlags_NavEnableGamepad) == 0)
return;

// Calling XInputGetState() every frame on disconnected gamepads is unfortunately too slow.
// Instead we refresh gamepad availability by calling XInputGetCapabilities() _only_ after receiving WM_DEVICECHANGE.
if (g_WantUpdateHasGamepad)
{
XINPUT_CAPABILITIES caps;
g_HasGamepad = (XInputGetCapabilities(0, XINPUT_FLAG_GAMEPAD, &caps) == ERROR_SUCCESS);
g_WantUpdateHasGamepad = false;
XINPUT_CAPABILITIES caps;
if (g_fXInputGetCapabilities)
g_HasGamepad = (g_fXInputGetCapabilities(0, XINPUT_FLAG_GAMEPAD, &caps) == ERROR_SUCCESS);
else
g_HasGamepad = false;
}

XINPUT_STATE xinput_state;

io.BackendFlags &= ~ImGuiBackendFlags_HasGamepad;
if (g_HasGamepad && XInputGetState(0, &xinput_state) == ERROR_SUCCESS)
if (g_HasGamepad && g_fXInputGetState)
{
const XINPUT_GAMEPAD& gamepad = xinput_state.Gamepad;
io.BackendFlags |= ImGuiBackendFlags_HasGamepad;

#define MAP_BUTTON(NAV_NO, BUTTON_ENUM) { io.NavInputs[NAV_NO] = (gamepad.wButtons & BUTTON_ENUM) ? 1.0f : 0.0f; }
#define MAP_ANALOG(NAV_NO, VALUE, V0, V1) { float vn = (float)(VALUE - V0) / (float)(V1 - V0); if (vn > 1.0f) vn = 1.0f; if (vn > 0.0f && io.NavInputs[NAV_NO] < vn) io.NavInputs[NAV_NO] = vn; }
MAP_BUTTON(ImGuiNavInput_Activate, XINPUT_GAMEPAD_A); // Cross / A
MAP_BUTTON(ImGuiNavInput_Cancel, XINPUT_GAMEPAD_B); // Circle / B
MAP_BUTTON(ImGuiNavInput_Menu, XINPUT_GAMEPAD_X); // Square / X
MAP_BUTTON(ImGuiNavInput_Input, XINPUT_GAMEPAD_Y); // Triangle / Y
MAP_BUTTON(ImGuiNavInput_DpadLeft, XINPUT_GAMEPAD_DPAD_LEFT); // D-Pad Left
MAP_BUTTON(ImGuiNavInput_DpadRight, XINPUT_GAMEPAD_DPAD_RIGHT); // D-Pad Right
MAP_BUTTON(ImGuiNavInput_DpadUp, XINPUT_GAMEPAD_DPAD_UP); // D-Pad Up
MAP_BUTTON(ImGuiNavInput_DpadDown, XINPUT_GAMEPAD_DPAD_DOWN); // D-Pad Down
MAP_BUTTON(ImGuiNavInput_FocusPrev, XINPUT_GAMEPAD_LEFT_SHOULDER); // L1 / LB
MAP_BUTTON(ImGuiNavInput_FocusNext, XINPUT_GAMEPAD_RIGHT_SHOULDER); // R1 / RB
MAP_BUTTON(ImGuiNavInput_TweakSlow, XINPUT_GAMEPAD_LEFT_SHOULDER); // L1 / LB
MAP_BUTTON(ImGuiNavInput_TweakFast, XINPUT_GAMEPAD_RIGHT_SHOULDER); // R1 / RB
MAP_ANALOG(ImGuiNavInput_LStickLeft, gamepad.sThumbLX, -XINPUT_GAMEPAD_LEFT_THUMB_DEADZONE, -32768);
MAP_ANALOG(ImGuiNavInput_LStickRight, gamepad.sThumbLX, +XINPUT_GAMEPAD_LEFT_THUMB_DEADZONE, +32767);
MAP_ANALOG(ImGuiNavInput_LStickUp, gamepad.sThumbLY, +XINPUT_GAMEPAD_LEFT_THUMB_DEADZONE, +32767);
MAP_ANALOG(ImGuiNavInput_LStickDown, gamepad.sThumbLY, -XINPUT_GAMEPAD_LEFT_THUMB_DEADZONE, -32767);
#undef MAP_BUTTON
#undef MAP_ANALOG
XINPUT_STATE xinput_state;
if (g_fXInputGetState(0, &xinput_state) == ERROR_SUCCESS)
{
const XINPUT_GAMEPAD& gamepad = xinput_state.Gamepad;
io.BackendFlags |= ImGuiBackendFlags_HasGamepad;
#define MAP_BUTTON(NAV_NO, BUTTON_ENUM) { io.NavInputs[NAV_NO] = (gamepad.wButtons & BUTTON_ENUM) ? 1.0f : 0.0f; }
#define MAP_ANALOG(NAV_NO, VALUE, V0, V1) { float vn = (float)(VALUE - V0) / (float)(V1 - V0);\
if (vn > 1.0f) vn = 1.0f;\
if (vn > 0.0f && io.NavInputs[NAV_NO] < vn) io.NavInputs[NAV_NO] = vn; }
MAP_BUTTON(ImGuiNavInput_Activate, XINPUT_GAMEPAD_A); // Cross / A
MAP_BUTTON(ImGuiNavInput_Cancel, XINPUT_GAMEPAD_B); // Circle / B
MAP_BUTTON(ImGuiNavInput_Menu, XINPUT_GAMEPAD_X); // Square / X
MAP_BUTTON(ImGuiNavInput_Input, XINPUT_GAMEPAD_Y); // Triangle / Y
MAP_BUTTON(ImGuiNavInput_DpadLeft, XINPUT_GAMEPAD_DPAD_LEFT); // D-Pad Left
MAP_BUTTON(ImGuiNavInput_DpadRight, XINPUT_GAMEPAD_DPAD_RIGHT); // D-Pad Right
MAP_BUTTON(ImGuiNavInput_DpadUp, XINPUT_GAMEPAD_DPAD_UP); // D-Pad Up
MAP_BUTTON(ImGuiNavInput_DpadDown, XINPUT_GAMEPAD_DPAD_DOWN); // D-Pad Down
MAP_BUTTON(ImGuiNavInput_FocusPrev, XINPUT_GAMEPAD_LEFT_SHOULDER); // L1 / LB
MAP_BUTTON(ImGuiNavInput_FocusNext, XINPUT_GAMEPAD_RIGHT_SHOULDER); // R1 / RB
MAP_BUTTON(ImGuiNavInput_TweakSlow, XINPUT_GAMEPAD_LEFT_SHOULDER); // L1 / LB
MAP_BUTTON(ImGuiNavInput_TweakFast, XINPUT_GAMEPAD_RIGHT_SHOULDER); // R1 / RB
MAP_ANALOG(ImGuiNavInput_LStickLeft, gamepad.sThumbLX, -XINPUT_GAMEPAD_LEFT_THUMB_DEADZONE, -32768);
MAP_ANALOG(ImGuiNavInput_LStickRight, gamepad.sThumbLX, +XINPUT_GAMEPAD_LEFT_THUMB_DEADZONE, +32767);
MAP_ANALOG(ImGuiNavInput_LStickUp, gamepad.sThumbLY, +XINPUT_GAMEPAD_LEFT_THUMB_DEADZONE, +32767);
MAP_ANALOG(ImGuiNavInput_LStickDown, gamepad.sThumbLY, -XINPUT_GAMEPAD_LEFT_THUMB_DEADZONE, -32767);
#undef MAP_BUTTON
#undef MAP_ANALOG
}
}
#endif // #ifndef IMGUI_IMPL_WIN32_DISABLE_GAMEPAD
}
Expand Down
2 changes: 1 addition & 1 deletion examples/example_win32_directx11/build_win32.bat
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Original file line number Diff line number Diff line change
@@ -1,4 +1,4 @@
@REM Build for Visual Studio compiler. Run your copy of vcvars32.bat or vcvarsall.bat to setup command-line compiler.
mkdir Debug
cl /nologo /Zi /MD /I .. /I ..\.. /I "%WindowsSdkDir%Include\um" /I "%WindowsSdkDir%Include\shared" /I "%DXSDK_DIR%Include" /D UNICODE /D _UNICODE *.cpp ..\..\backends\imgui_impl_dx11.cpp ..\..\backends\imgui_impl_win32.cpp ..\..\imgui*.cpp /FeDebug/example_win32_directx11.exe /FoDebug/ /link /LIBPATH:"%DXSDK_DIR%/Lib/x86" d3d11.lib d3dcompiler.lib
cl /nologo /Zi /MD /I ..\.. /I ..\..\backends /I "%WindowsSdkDir%Include\um" /I "%WindowsSdkDir%Include\shared" /I "%DXSDK_DIR%Include" /D UNICODE /D _UNICODE *.cpp ..\..\backends\imgui_impl_dx11.cpp ..\..\backends\imgui_impl_win32.cpp ..\..\imgui*.cpp /FeDebug/example_win32_directx11.exe /FoDebug/ /link /LIBPATH:"%DXSDK_DIR%/Lib/x86" d3d11.lib d3dcompiler.lib

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