detectdx5.cpp

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#include "detectdx5.h"
 
#include <ddraw.h>
#include <dinput.h>
 
typedef HRESULT WINAPI DirectDrawCreate_fn(GUID FAR* lpGUID, LPDIRECTDRAW FAR* lplpDD, IUnknown FAR* pUnkOuter);
typedef HRESULT WINAPI
DirectInputCreateA_fn(HINSTANCE hinst, DWORD dwVersion, LPDIRECTINPUTA* ppDI, LPUNKNOWN punkOuter);
 
// FUNCTION: CONFIG 0x004048f0
BOOL DetectDirectX5()
{
    unsigned int version;
    BOOL found;
    DetectDirectX(&version, &found);
    return version >= 0x500;
}
 
// FUNCTION: CONFIG 0x00404920
void DetectDirectX(unsigned int* p_version, BOOL* p_found)
{
    OSVERSIONINFOA os_version;
 
    os_version.dwOSVersionInfoSize = sizeof(os_version);
    if (!GetVersionExA(&os_version)) {
        *p_version = 0;
        *p_found = 0;
        return;
    }
    if (os_version.dwPlatformId == 2) {
        *p_found = 2;
        if (os_version.dwMajorVersion < 4) {
            *p_found = 0;
            return;
        }
        if (os_version.dwMajorVersion != 4) {
            *p_version = 0x501;
            return;
        }
        *p_version = 0x200;
        HMODULE dinput_module = LoadLibraryA("DINPUT.DLL");
        if (!dinput_module) {
            OutputDebugStringA("Couldn't LoadLibrary DInput\r\n");
            return;
        }
        DirectInputCreateA_fn* func_DirectInputCreateA =
            (DirectInputCreateA_fn*) GetProcAddress(dinput_module, "DirectInputCreateA");
        FreeLibrary(dinput_module);
        if (!func_DirectInputCreateA) {
            OutputDebugStringA("Couldn't GetProcAddress DInputCreate\r\n");
            return;
        }
        *p_version = 0x300;
        return;
    }
    *p_found = 1;
    if (LOWORD(os_version.dwBuildNumber) >= 0x550) {
        *p_version = 0x501;
        return;
    }
    HMODULE ddraw_module = LoadLibraryA("DDRAW.DLL");
    if (!ddraw_module) {
        *p_version = 0;
        *p_found = 0;
        FreeLibrary(ddraw_module);
        return;
    }
    DirectDrawCreate_fn* func_DirectDrawCreate =
        (DirectDrawCreate_fn*) GetProcAddress(ddraw_module, "DirectDrawCreate");
    if (!func_DirectDrawCreate) {
        *p_version = 0;
        *p_found = 0;
        FreeLibrary(ddraw_module);
        OutputDebugStringA("Couldn't LoadLibrary DDraw\r\n");
        return;
    }
    LPDIRECTDRAW ddraw;
    if (FAILED(func_DirectDrawCreate(NULL, &ddraw, NULL))) {
        *p_version = 0;
        *p_found = 0;
        FreeLibrary(ddraw_module);
        OutputDebugStringA("Couldn't create DDraw\r\n");
        return;
    }
    *p_version = 0x100;
    LPDIRECTDRAW2 ddraw2;
    if (FAILED(ddraw->QueryInterface(IID_IDirectDraw2, (LPVOID*) &ddraw2))) {
        ddraw->Release();
        FreeLibrary(ddraw_module);
        OutputDebugStringA("Couldn't QI DDraw2\r\n");
        return;
    }
    ddraw->Release();
    *p_version = 0x200;
    HMODULE dinput_module = LoadLibraryA("DINPUT.DLL");
    if (!dinput_module) {
        OutputDebugStringA("Couldn't LoadLibrary DInput\r\n");
        ddraw2->Release();
        FreeLibrary(ddraw_module);
        return;
    }
    DirectInputCreateA_fn* func_DirectInputCreateA =
        (DirectInputCreateA_fn*) GetProcAddress(dinput_module, "DirectInputCreateA");
    FreeLibrary(dinput_module);
    if (!func_DirectInputCreateA) {
        FreeLibrary(ddraw_module);
        ddraw2->Release();
        OutputDebugStringA("Couldn't GetProcAddress DInputCreate\r\n");
        return;
    }
    *p_version = 0x300;
    DDSURFACEDESC surface_desc;
    memset(&surface_desc, 0, sizeof(surface_desc));
    surface_desc.dwSize = sizeof(surface_desc);
    surface_desc.dwFlags = DDSD_CAPS;
    surface_desc.ddsCaps.dwCaps = DDCAPS2_NONLOCALVIDMEM;
    if (FAILED(ddraw2->SetCooperativeLevel(NULL, DISCL_BACKGROUND))) {
        ddraw2->Release();
        FreeLibrary(ddraw_module);
        *p_version = 0;
        OutputDebugStringA("Couldn't Set coop level\r\n");
        return;
    }
    LPDIRECTDRAWSURFACE surface;
    if (FAILED(ddraw2->CreateSurface(&surface_desc, &surface, NULL))) {
        ddraw2->Release();
        FreeLibrary(ddraw_module);
        *p_version = 0;
        OutputDebugStringA("Couldn't CreateSurface\r\n");
        return;
    }
    LPDIRECTDRAWSURFACE3 surface3;
    if (FAILED(surface->QueryInterface(IID_IDirectDrawSurface3, (LPVOID*) &surface3))) {
        ddraw2->Release();
        FreeLibrary(ddraw_module);
        return;
    }
    *p_version = 0x500;
    surface3->Release();
    ddraw2->Release();
    FreeLibrary(ddraw_module);
}