Version 2

Changes:
- Fully integrated with thcrap, won't work without it
Sideeffects:
- Game independent (even beyond Touhou)
- Easier to install (just drag th_corner_sensitivity into thcrap's bin
  folder)

src/th_corner_sensitivity.cpp

@@ -0,0 +1,116 @@
+#define PI 3.141592653589793115997963468544185161590576171875
+
+#include <thcrap.h>
+#include <Xinput.h>
+
+const wchar_t *default_ini =
+L"[main]\n"
+L"; corner_sensitivity: 0 through 90 degrees. 0 = no corners, 90 = everything is a corner\n"
+L"corner_sensitivity = 50\n"
+L"; deadzone: 0 = seemingly still joystick inputs still recognized will be considered inputs, 32767 = A full push wouldn't be enough for an input to get through\n"
+L"deadzone = 10000\n"
+;
+
+typedef DWORD(__stdcall XInputGetState_t)(DWORD, XINPUT_STATE*);
+XInputGetState_t *orig_XInputGetState = nullptr;
+
+double deadzone = 0;
+double corner_sensitivity = 0;
+double min_sens = 0;
+double max_sens = 0;
+
+DWORD __stdcall detoured_XInputGetState(DWORD dwUserIndex, XINPUT_STATE *pState) {
+	bool corner_allowed = true;
+	DWORD ret = orig_XInputGetState(dwUserIndex, pState);
+
+
+	if (ret != ERROR_SUCCESS) {
+		return ret;
+	}
+
+	double push = sqrt(pState->Gamepad.sThumbLX*pState->Gamepad.sThumbLX + pState->Gamepad.sThumbLY*pState->Gamepad.sThumbLY);
+
+	if (push < deadzone) {
+		pState->Gamepad.sThumbLX = 0;
+		pState->Gamepad.sThumbLY = 0;
+		return ERROR_SUCCESS;
+	}
+
+	SHORT posX = pState->Gamepad.sThumbLX;
+	SHORT posY = pState->Gamepad.sThumbLY;
+
+	if (0 > posX) {
+		if (posX == -32768) {
+			posX = 32767;
+		}
+		else {
+			posX = -posX;
+		}
+	}
+	if (0 > posY) {
+		if (posY == -32768) {
+			posY = 32767;
+		}
+		else {
+			posY = -posY;
+		}
+	}
+
+	double angle = atan2(posY, posX) * (180/PI);
+
+	if (!((angle - max_sens)*(angle - min_sens) <= 0)) {
+		posX > posY ? pState->Gamepad.sThumbLY = 0 : pState->Gamepad.sThumbLX = 0;
+	}
+
+	return ERROR_SUCCESS;
+}
+
+int __stdcall thcrap_plugin_init() {
+	HMODULE hXInput = GetModuleHandleW(L"xinput1_3.dll");
+	if (!hXInput) {
+		return 1;
+	}
+	orig_XInputGetState = (XInputGetState_t*)GetProcAddress(hXInput, "XInputGetState");
+	int ret = detour_chain("xinput1_3.dll", 1,
+		"XInputGetState", detoured_XInputGetState, &orig_XInputGetState,
+		NULL
+	);
+
+	size_t path_len = (GetCurrentDirectoryW(0, NULL)
+		+ 1  // Backslash
+		+ 6  // wcslen(L"config") = 6
+		+ 25 // wcslen(L"th_corner_sensitivity.ini") = 25
+		+ 1  // NULL terminator
+	);
+
+	VLA(wchar_t, path, path_len);
+	GetCurrentDirectoryW(path_len * sizeof(wchar_t), path);
+
+	wcscpy(PathAddBackslashW(path), L"config");
+	wcscpy(PathAddBackslashW(path), L"th_corner_sensitivity.ini");
+
+	if (!PathFileExistsW(path)) {
+		HANDLE hIni = CreateFileW(path, GENERIC_READ | GENERIC_WRITE, FILE_SHARE_READ, NULL, CREATE_NEW, FILE_ATTRIBUTE_NORMAL, NULL);
+		DWORD nByteW;
+		WriteFile(hIni, (LPCVOID)default_ini, wcslen(default_ini) * sizeof(wchar_t), &nByteW, NULL);
+		CloseHandle(hIni);
+	}
+
+	wchar_t corner_sensitivity_str[3];
+	GetPrivateProfileStringW(L"main", L"corner_sensitivity", L"50", corner_sensitivity_str, 3, path);
+	wchar_t *end;
+	corner_sensitivity = wcstod(corner_sensitivity_str, &end);
+
+	if (corner_sensitivity == 0.0) {
+		log_mbox("th_corner_sensitivity error", MB_ICONERROR | MB_OK, "The corner_sensitivity value in corner_sensitivity.ini is invalid, using default value!");
+		corner_sensitivity = 30.0;
+	}
+
+	min_sens = (90 - corner_sensitivity) / 2;
+	max_sens = min_sens + corner_sensitivity;
+	deadzone = GetPrivateProfileIntW(L"main", L"deadzone", 10000, path);
+
+	VLA_FREE(path);
+
+	return 0;
+}

corner_sensitivity/corner_sensitivity.def → th_corner_sensitivity.def

@@ -1,3 +1,2 @@
 EXPORTS
-	_XInputGetState
 	thcrap_plugin_init

corner_sensitivity.ini → th_corner_sensitivity.ini

@@ -1,5 +1,5 @@
 [main]
 ; corner_sensitivity: 0 through 90 degrees. 0 = no corners, 90 = everything is a corner
-corner_sensitivity = 30
-; deadzone: 0 = seemingly still joystick inputs still recognized will be considered inputs, 32767 = you need to fully push the stick for an input to get recognized
-deadzone = 600
+corner_sensitivity = 20
+; deadzone: 0 = seemingly still joystick inputs still recognized will be considered inputs, 32767 = A full push wouldn't be enough for an input to get through.
+deadzone = 10000