Add fallback for creating other video backends. (#254)

* Add fallback for creating other video backends.

* Update video.cpp

UnleashedRecomp/gpu/video.cpp

@@ -95,6 +95,14 @@ namespace plume
 #else
     extern std::unique_ptr<RenderInterface> CreateVulkanInterface();
 #endif
+
+    static std::unique_ptr<RenderInterface> CreateVulkanInterfaceWrapper() {
+#ifdef SDL_VULKAN_ENABLED
+        return CreateVulkanInterface(GameWindow::s_renderWindow);
+#else
+        return CreateVulkanInterface();
+#endif
+    }
 }
 
 #pragma pack(push, 1)
@@ -1472,7 +1480,7 @@ static void BeginCommandList()
     commandList->setGraphicsDescriptorSet(g_samplerDescriptorSet.get(), 3);
 }
 
-void Video::CreateHostDevice(const char *sdlVideoDriver)
+bool Video::CreateHostDevice(const char *sdlVideoDriver)
 {
     for (uint32_t i = 0; i < 16; i++)
         g_inputSlots[i].index = i;
@@ -1487,20 +1495,39 @@ void Video::CreateHostDevice(const char *sdlVideoDriver)
     g_vulkan = DetectWine() || Config::GraphicsAPI == EGraphicsAPI::Vulkan;
 #endif
 
-    LoadEmbeddedResources();
+    // Attempt to create the possible backends using a vector of function pointers. Whichever succeeds first will be the chosen API.
+    using RenderInterfaceFunction = std::unique_ptr<RenderInterface>(void);
+    std::vector<RenderInterfaceFunction *> interfaceFunctions;
 
-    if (g_vulkan)
-#ifdef SDL_VULKAN_ENABLED
-        g_interface = CreateVulkanInterface(GameWindow::s_renderWindow);
-#else
-        g_interface = CreateVulkanInterface();
-#endif
 #ifdef UNLEASHED_RECOMP_D3D12
-    else
+    interfaceFunctions.push_back(g_vulkan ? CreateVulkanInterfaceWrapper : CreateD3D12Interface);
-        g_interface = CreateD3D12Interface();
+    interfaceFunctions.push_back(g_vulkan ? CreateD3D12Interface : CreateVulkanInterfaceWrapper);
+#else
+    interfaceFunctions.push_back(CreateVulkanInterfaceWrapper);
 #endif
 
-    g_device = g_interface->createDevice();
+    for (RenderInterfaceFunction *interfaceFunction : interfaceFunctions)
+    {
+        g_interface = interfaceFunction();
+        if (g_interface != nullptr)
+        {
+            g_device = g_interface->createDevice();
+            if (g_device != nullptr)
+            {
+#ifdef UNLEASHED_RECOMP_D3D12
+                g_vulkan = (interfaceFunction == CreateVulkanInterfaceWrapper);
+#endif
+                break;
+            }
+        }
+    }
+
+    if (g_device == nullptr)
+    {
+        return false;
+    }
+
+    LoadEmbeddedResources();
 
     g_capabilities = g_device->getCapabilities();
 
@@ -1712,6 +1739,8 @@ void Video::CreateHostDevice(const char *sdlVideoDriver)
         blankTextureBarriers[i] = RenderTextureBarrier(g_blankTextures[i].get(), RenderTextureLayout::SHADER_READ);
 
     g_commandLists[g_frame]->barriers(RenderBarrierStage::NONE, blankTextureBarriers, std::size(blankTextureBarriers));
+
+    return true;
 }
 
 void Video::WaitForGPU()
@@ -2068,6 +2097,10 @@ static void DrawProfiler()
         ImGui::Text("Triangle Fan: %s", g_capabilities.triangleFan ? "Supported" : "Unsupported");
         ImGui::NewLine();
 
+        ImGui::Text("API: %s", g_vulkan ? "Vulkan" : "D3D12");
+        ImGui::Text("Device: %s", g_device->getDescription().name.c_str());
+        ImGui::Text("VRAM: %.2f MiB", (double)(g_device->getDescription().dedicatedVideoMemory) / (1024.0 * 1024.0));
+
         const char* sdlVideoDriver = SDL_GetCurrentVideoDriver();
         if (sdlVideoDriver != nullptr)
             ImGui::Text("SDL Video Driver: %s", sdlVideoDriver);

UnleashedRecomp/gpu/video.h

@@ -18,7 +18,7 @@ struct Video
     static inline uint32_t s_viewportWidth;
     static inline uint32_t s_viewportHeight;
 
-    static void CreateHostDevice(const char *sdlVideoDriver);
+    static bool CreateHostDevice(const char *sdlVideoDriver);
     static void WaitOnSwapChain();
     static void Present();
     static void StartPipelinePrecompilation();

UnleashedRecomp/locale/locale.cpp

@@ -377,6 +377,12 @@ std::unordered_map<std::string, std::unordered_map<ELanguage, std::string>> g_lo
             { ELanguage::English, "The achievement data could not be loaded.\nYour achievements will not be saved." }
         }
     },
+    {
+        "Video_BackendError",
+        {
+            { ELanguage::English, "Unable to create a D3D12 (Windows) or Vulkan backend.\n\nPlease make sure that:\n\n- Your system meets the minimum requirements.\n- Your GPU drivers are up to date.\n- Your operating system is on the latest version available." },
+        }
+    },
     {
         "Common_On",
         {

UnleashedRecomp/main.cpp

@@ -18,6 +18,7 @@
 #include <os/logger.h>
 #include <os/process.h>
 #include <os/registry.h>
+#include <ui/game_window.h>
 #include <ui/installer_wizard.h>
 #include <mod/mod_loader.h>
 
@@ -182,7 +183,11 @@ int main(int argc, char *argv[])
     bool runInstallerWizard = forceInstaller || forceDLCInstaller || !isGameInstalled;
     if (runInstallerWizard)
     {
-        Video::CreateHostDevice(sdlVideoDriver);
+        if (!Video::CreateHostDevice(sdlVideoDriver))
+        {
+            SDL_ShowSimpleMessageBox(SDL_MESSAGEBOX_ERROR, GameWindow::GetTitle(), Localise("Video_BackendError").c_str(), GameWindow::s_pWindow);
+            return 1;
+        }
 
         if (!InstallerWizard::Run(GAME_INSTALL_DIRECTORY, isGameInstalled && forceDLCInstaller))
         {
@@ -197,7 +202,13 @@ int main(int argc, char *argv[])
     uint32_t entry = LdrLoadModule(modulePath);
 
     if (!runInstallerWizard)
-        Video::CreateHostDevice(sdlVideoDriver);
+    {
+        if (!Video::CreateHostDevice(sdlVideoDriver))
+        {
+            SDL_ShowSimpleMessageBox(SDL_MESSAGEBOX_ERROR, GameWindow::GetTitle(), Localise("Video_BackendError").c_str(), GameWindow::s_pWindow);
+            return 1;
+        }
+    }
 
     Video::StartPipelinePrecompilation();
 

UnleashedRecomp/ui/game_window.h

@@ -12,7 +12,7 @@
 class GameWindow
 {
 public:
-    static inline SDL_Window* s_pWindow;
+    static inline SDL_Window* s_pWindow = nullptr;
     static inline plume::RenderWindow s_renderWindow;
 
     static inline int s_x;