vulkan tip

[bruhmoment21]

hey i am the guy that helped you get vulkan to work. so i had nothing else on my mind at this time and wanted to make vulkan hook work even without steam overlay(for performance reasons or idk). i dropped steps in real language (english) and in code so basically.

1. we want to hook this func because this method has the important things u need specifically m_device. this is m_device class
2. after we got m_device we need to get our 3 functions vkAcquireImageKHR, vkQueuePresentKHR, vkCreateSwapchain addressess.
3. hook them

New Vulkan::Hook (not c+p ready btw). GetHandle and GetProcAddress are crossplatform wrappers they are dlopen and dlsym.

void Hook( ) {
        const Module::CachedModule* hDXVKLib = Module::GetHandle("libdxvk_d3d9.so");
        if (!hDXVKLib)
            return;

        void* fnPresentImage = Module::GetProcAddress(hDXVKLib->hHandle, "_ZN4dxvk2vk9Presenter12presentImageEv");
        if (fnPresentImage) {
            HOOK(PresentImage);
        }
    }

Presenter::presentImage Hook (old Vulkan::Hook)

static CHook<VkResult VKAPI_CALL(uintptr_t)> oPresentImage;
static VkResult VKAPI_CALL hkPresentImage(uintptr_t ecx) {
    // just check things so u dont hook twice or sum
    if (ecx && !oAcquireNextImageKHR.originalFn) {
        // offsets are easy to find in ida everything is exported.
        uintptr_t m_device = *reinterpret_cast<uintptr_t*>(ecx + 0x10);
        if (m_device) {
            if (!CreateDeviceVK( )) {
                LOG("[katehook] CreateDeviceVK() failed\n");
                return oPresentImage.originalFn(ecx);
            }

            void* fnAcquireNextImageKHR = *reinterpret_cast<void**>(m_device + 0x458);
            void* fnQueuePresentKHR = *reinterpret_cast<void**>(m_device + 0x460);
            void* fnCreateSwapchainKHR = *reinterpret_cast<void**>(m_device + 0x440);

            if (g_FakeDevice) {
                vkDestroyDevice(g_FakeDevice, g_Allocator);
                g_FakeDevice = NULL;
            }

            if (fnAcquireNextImageKHR) {
                HOOK(AcquireNextImageKHR);
                HOOK(QueuePresentKHR);
                HOOK(CreateSwapchainKHR);
            }
        }
    }

    return oPresentImage.originalFn(ecx);
}

edit: this should work for every game that uses dxvk most probably (on linux tho).

[Sumandora]

Alright, will keep this for the future.
I have more important work on this project right now, so I will be sticking to that first.
If the master branch gets more stable, I might merge the vulkan support into master and then I'm going to try to implement this.
The master branch just crashes from time to time right now and this is a issue that has to be addressed first.