9 changed files with 2358 additions and 9 deletions
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@ -36,11 +36,23 @@ elseif(WIN32)
 	set(CMAKE_SHARED_LIBRARY_PREFIX "")
 endif()

+set(BUILD_D3D11 OFF)
+
+if (WIN32)
+	set(BUILD_D3D11 ON)
+endif()
+
 # Defines
 add_definitions(
 	-DREFRESH_DRIVER_VULKAN
 )

+if (BUILD_D3D11)
+	add_definitions(
+		-DREFRESH_DRIVER_D3D11
+	)
+endif()
+
 # Source lists
 add_library(Refresh
 	# Public Headers
@ -49,8 +61,10 @@ add_library(Refresh
 	# Internal Headers
 	src/Refresh_Driver.h
 	src/Refresh_Driver_Vulkan_vkfuncs.h
+	src/Refresh_Driver_D3D11_cdefines.h
 	# Source Files
 	src/Refresh.c
+	src/Refresh_Driver_D3D11.c
 	src/Refresh_Driver_Vulkan.c
 	src/Refresh_Image.c
 )
--- a/src/Refresh.c
+++ b/src/Refresh.c
@ -34,7 +34,12 @@
 /* Drivers */

 static const Refresh_Driver *drivers[] = {
+#if REFRESH_DRIVER_VULKAN
 	&VulkanDriver,
+#endif
+#if REFRESH_DRIVER_D3D11
+	&D3D11Driver,
+#endif
 	NULL
 };

@ -124,22 +129,43 @@ uint32_t Refresh_LinkedVersion(void)

 /* Driver Functions */

-static int32_t selectedDriver = 0;
+static int32_t selectedDriver = -1;

 Refresh_Device* Refresh_CreateDevice(
 	Refresh_PresentationParameters *presentationParameters,
 	uint8_t debugMode
 ) {
-	if (selectedDriver < 0)
+	uint32_t result = 0;
+	uint32_t i;
+	const char *hint = SDL_GetHint("REFRESH_FORCE_DRIVER");
+	for (i = 0; drivers[i] != NULL; i += 1)
 	{
-		return NULL;
+		if (hint != NULL)
+		{
+			if (SDL_strcmp(hint, drivers[i]->Name) != 0)
+			{
+				continue;
+			}
 		}

+		/* FIXME: add fallback driver handling */
+		break;
+	}
+
+	if (drivers[i] == NULL)
+	{
+		Refresh_LogError("No supported Refresh driver found!");
+		return NULL;
+	}
+	else
+	{
+		selectedDriver = i;
 		return drivers[selectedDriver]->CreateDevice(
 			presentationParameters,
 			debugMode
 		);
 	}
+}

 void Refresh_DestroyDevice(Refresh_Device *device)
 {
--- a/src/Refresh_Driver.h
+++ b/src/Refresh_Driver.h
@ -522,6 +522,7 @@ typedef struct Refresh_Driver
 } Refresh_Driver;

 extern Refresh_Driver VulkanDriver;
+extern Refresh_Driver D3D11Driver;

 #endif /* REFRESH_DRIVER_H */

--- a/src/Refresh_Driver_D3D11.c
+++ b/src/Refresh_Driver_D3D11.c
--- a/src/Refresh_Driver_D3D11_cdefines.h
+++ b/src/Refresh_Driver_D3D11_cdefines.h
@ -0,0 +1,215 @@
+/* Refresh - XNA-inspired 3D Graphics Library with modern capabilities
+ *
+ * Copyright (c) 2020 Evan Hemsley
+ *
+ * This software is provided 'as-is', without any express or implied warranty.
+ * In no event will the authors be held liable for any damages arising from
+ * the use of this software.
+ *
+ * Permission is granted to anyone to use this software for any purpose,
+ * including commercial applications, and to alter it and redistribute it
+ * freely, subject to the following restrictions:
+ *
+ * 1. The origin of this software must not be misrepresented; you must not
+ * claim that you wrote the original software. If you use this software in a
+ * product, an acknowledgment in the product documentation would be
+ * appreciated but is not required.
+ *
+ * 2. Altered source versions must be plainly marked as such, and must not be
+ * misrepresented as being the original software.
+ *
+ * 3. This notice may not be removed or altered from any source distribution.
+ *
+ * Evan "cosmonaut" Hemsley <evan@moonside.games>
+ *
+ */
+
+/* Function Pointer Signatures */
+typedef HRESULT(WINAPI* PFN_CREATE_DXGI_FACTORY)(const GUID* riid, void** ppFactory);
+
+ /* IIDs (from https://magnumdb.com) */
+
+static const IID D3D_IID_IDXGIFactory1 = { 0x770aae78,0xf26f,0x4dba,{0xa8,0x29,0x25,0x3c,0x83,0xd1,0xb3,0x87} };
+static const IID D3D_IID_IDXGIFactory6 = { 0xc1b6694f,0xff09,0x44a9,{0xb0,0x3c,0x77,0x90,0x0a,0x0a,0x1d,0x17} };
+static const IID D3D_IID_IDXGIAdapter1 = { 0x29038f61,0x3839,0x4626,{0x91,0xfd,0x08,0x68,0x79,0x01,0x1a,0x05} };
+static const IID D3D_IID_ID3D11Texture2D = { 0x6f15aaf2,0xd208,0x4e89,{0x9a,0xb4,0x48,0x95,0x35,0xd3,0x4f,0x9c} };
+
+/* IDXGIFactory6 (taken from dxgi1_6.h, cleaned up a bit) */
+typedef enum
+{
+	DXGI_FEATURE_PRESENT_ALLOW_TEARING = 0
+} DXGI_FEATURE;
+
+typedef enum
+{
+	DXGI_GPU_PREFERENCE_UNSPECIFIED = 0,
+	DXGI_GPU_PREFERENCE_MINIMUM_POWER = (DXGI_GPU_PREFERENCE_UNSPECIFIED + 1),
+	DXGI_GPU_PREFERENCE_HIGH_PERFORMANCE = (DXGI_GPU_PREFERENCE_MINIMUM_POWER + 1)
+} DXGI_GPU_PREFERENCE;
+
+typedef struct IDXGIFactory6 IDXGIFactory6;
+typedef struct IDXGIFactory6Vtbl
+{
+	HRESULT(STDMETHODCALLTYPE* QueryInterface)(
+		IDXGIFactory6* This,
+		REFIID riid,
+		void** ppvObject);
+
+	ULONG(STDMETHODCALLTYPE* AddRef)(
+		IDXGIFactory6* This);
+
+	ULONG(STDMETHODCALLTYPE* Release)(
+		IDXGIFactory6* This);
+
+	HRESULT(STDMETHODCALLTYPE* SetPrivateData)(
+		IDXGIFactory6* This,
+		REFGUID Name,
+		UINT DataSize,
+		const void* pData);
+
+	HRESULT(STDMETHODCALLTYPE* SetPrivateDataInterface)(
+		IDXGIFactory6* This,
+		REFGUID Name,
+		const IUnknown* pUnknown);
+
+	HRESULT(STDMETHODCALLTYPE* GetPrivateData)(
+		IDXGIFactory6* This,
+		REFGUID Name,
+		UINT* pDataSize,
+		void* pData);
+
+	HRESULT(STDMETHODCALLTYPE* GetParent)(
+		IDXGIFactory6* This,
+		REFIID riid,
+		void** ppParent);
+
+	HRESULT(STDMETHODCALLTYPE* EnumAdapters)(
+		IDXGIFactory6* This,
+		UINT Adapter,
+		IDXGIAdapter** ppAdapter);
+
+	HRESULT(STDMETHODCALLTYPE* MakeWindowAssociation)(
+		IDXGIFactory6* This,
+		HWND WindowHandle,
+		UINT Flags);
+
+	HRESULT(STDMETHODCALLTYPE* GetWindowAssociation)(
+		IDXGIFactory6* This,
+		HWND* pWindowHandle);
+
+	HRESULT(STDMETHODCALLTYPE* CreateSwapChain)(
+		IDXGIFactory6* This,
+		IUnknown* pDevice,
+		DXGI_SWAP_CHAIN_DESC* pDesc,
+		IDXGISwapChain** ppSwapChain);
+
+	HRESULT(STDMETHODCALLTYPE* CreateSoftwareAdapter)(
+		IDXGIFactory6* This,
+		HMODULE Module,
+		IDXGIAdapter** ppAdapter);
+
+	HRESULT(STDMETHODCALLTYPE* EnumAdapters1)(
+		IDXGIFactory6* This,
+		UINT Adapter,
+		IDXGIAdapter1** ppAdapter);
+
+	BOOL(STDMETHODCALLTYPE* IsCurrent)(
+		IDXGIFactory6* This);
+
+	BOOL(STDMETHODCALLTYPE* IsWindowedStereoEnabled)(
+		IDXGIFactory6* This);
+
+	HRESULT(STDMETHODCALLTYPE* CreateSwapChainForHwnd)(
+		IDXGIFactory6* This,
+		IUnknown* pDevice,
+		HWND hWnd,
+		void* pDesc,
+		void* pFullscreenDesc,
+		void* pRestrictToOutput,
+		void** ppSwapChain);
+
+	HRESULT(STDMETHODCALLTYPE* CreateSwapChainForCoreWindow)(
+		IDXGIFactory6* This,
+		IUnknown* pDevice,
+		IUnknown* pWindow,
+		void* pDesc,
+		void* pRestrictToOutput,
+		void** ppSwapChain);
+
+	HRESULT(STDMETHODCALLTYPE* GetSharedResourceAdapterLuid)(
+		IDXGIFactory6* This,
+		HANDLE hResource,
+		LUID* pLuid);
+
+	HRESULT(STDMETHODCALLTYPE* RegisterStereoStatusWindow)(
+		IDXGIFactory6* This,
+		HWND WindowHandle,
+		UINT wMsg,
+		DWORD* pdwCookie);
+
+	HRESULT(STDMETHODCALLTYPE* RegisterStereoStatusEvent)(
+		IDXGIFactory6* This,
+		HANDLE hEvent,
+		DWORD* pdwCookie);
+
+	void (STDMETHODCALLTYPE* UnregisterStereoStatus)(
+		IDXGIFactory6* This,
+		DWORD dwCookie);
+
+	HRESULT(STDMETHODCALLTYPE* RegisterOcclusionStatusWindow)(
+		IDXGIFactory6* This,
+		HWND WindowHandle,
+		UINT wMsg,
+		DWORD* pdwCookie);
+
+	HRESULT(STDMETHODCALLTYPE* RegisterOcclusionStatusEvent)(
+		IDXGIFactory6* This,
+		HANDLE hEvent,
+		DWORD* pdwCookie);
+
+	void (STDMETHODCALLTYPE* UnregisterOcclusionStatus)(
+		IDXGIFactory6* This,
+		DWORD dwCookie);
+
+	HRESULT(STDMETHODCALLTYPE* CreateSwapChainForComposition)(
+		IDXGIFactory6* This,
+		IUnknown* pDevice,
+		void* pDesc,
+		void* pRestrictToOutput,
+		void** ppSwapChain);
+
+	UINT(STDMETHODCALLTYPE* GetCreationFlags)(
+		IDXGIFactory6* This);
+
+	HRESULT(STDMETHODCALLTYPE* EnumAdapterByLuid)(
+		IDXGIFactory6* This,
+		LUID AdapterLuid,
+		REFIID riid,
+		void** ppvAdapter);
+
+	HRESULT(STDMETHODCALLTYPE* EnumWarpAdapter)(
+		IDXGIFactory6* This,
+		REFIID riid,
+		void** ppvAdapter);
+
+	HRESULT(STDMETHODCALLTYPE* CheckFeatureSupport)(
+		IDXGIFactory6* This,
+		DXGI_FEATURE Feature,
+		void* pFeatureSupportData,
+		UINT FeatureSupportDataSize);
+
+	HRESULT(STDMETHODCALLTYPE* EnumAdapterByGpuPreference)(
+		IDXGIFactory6* This,
+		UINT Adapter,
+		DXGI_GPU_PREFERENCE GpuPreference,
+		REFIID riid,
+		void** ppvAdapter);
+} IDXGIFactory6Vtbl;
+
+struct IDXGIFactory6
+{
+	struct IDXGIFactory6Vtbl* lpVtbl;
+};
+
+#define IDXGIFactory6_EnumAdapterByGpuPreference(This,Adapter,GpuPreference,riid,ppvAdapter)	\
+	( (This)->lpVtbl -> EnumAdapterByGpuPreference(This,Adapter,GpuPreference,riid,ppvAdapter) ) 
--- a/src/Refresh_Driver_Vulkan.c
+++ b/src/Refresh_Driver_Vulkan.c
@ -10642,4 +10642,8 @@ Refresh_Driver VulkanDriver = {
 	VULKAN_CreateDevice
 };

+#else
+
+extern int this_tu_is_empty;
+
 #endif //REFRESH_DRIVER_VULKAN
--- a/visualc/Refresh.sln
+++ b/visualc/Refresh.sln
@ -8,19 +8,29 @@ EndProject
 Global
 	GlobalSection(SolutionConfigurationPlatforms) = preSolution
 		Debug|x64 = Debug|x64
+		Debug|x86 = Debug|x86
 		MinSizeRel|x64 = MinSizeRel|x64
+		MinSizeRel|x86 = MinSizeRel|x86
 		Release|x64 = Release|x64
+		Release|x86 = Release|x86
 		RelWithDebInfo|x64 = RelWithDebInfo|x64
+		RelWithDebInfo|x86 = RelWithDebInfo|x86
 	EndGlobalSection
 	GlobalSection(ProjectConfigurationPlatforms) = postSolution
 		{6DB15344-E000-45CB-A48A-1D72F7D6E945}.Debug|x64.ActiveCfg = Debug|x64
 		{6DB15344-E000-45CB-A48A-1D72F7D6E945}.Debug|x64.Build.0 = Debug|x64
+		{6DB15344-E000-45CB-A48A-1D72F7D6E945}.Debug|x86.ActiveCfg = Debug|Win32
+		{6DB15344-E000-45CB-A48A-1D72F7D6E945}.Debug|x86.Build.0 = Debug|Win32
 		{6DB15344-E000-45CB-A48A-1D72F7D6E945}.MinSizeRel|x64.ActiveCfg = MinSizeRel|x64
 		{6DB15344-E000-45CB-A48A-1D72F7D6E945}.MinSizeRel|x64.Build.0 = MinSizeRel|x64
+		{6DB15344-E000-45CB-A48A-1D72F7D6E945}.MinSizeRel|x86.ActiveCfg = MinSizeRel|x64
 		{6DB15344-E000-45CB-A48A-1D72F7D6E945}.Release|x64.ActiveCfg = Release|x64
 		{6DB15344-E000-45CB-A48A-1D72F7D6E945}.Release|x64.Build.0 = Release|x64
+		{6DB15344-E000-45CB-A48A-1D72F7D6E945}.Release|x86.ActiveCfg = Release|Win32
+		{6DB15344-E000-45CB-A48A-1D72F7D6E945}.Release|x86.Build.0 = Release|Win32
 		{6DB15344-E000-45CB-A48A-1D72F7D6E945}.RelWithDebInfo|x64.ActiveCfg = RelWithDebInfo|x64
 		{6DB15344-E000-45CB-A48A-1D72F7D6E945}.RelWithDebInfo|x64.Build.0 = RelWithDebInfo|x64
+		{6DB15344-E000-45CB-A48A-1D72F7D6E945}.RelWithDebInfo|x86.ActiveCfg = RelWithDebInfo|x64
 	EndGlobalSection
 	GlobalSection(SolutionProperties) = preSolution
 		HideSolutionNode = FALSE
--- a/visualc/Refresh.vcxproj
+++ b/visualc/Refresh.vcxproj
@ -61,7 +61,9 @@
    <ClCompile>
      <WarningLevel>Level3</WarningLevel>
      <Optimization>Disabled</Optimization>
-      <PreprocessorDefinitions>REFRESH_DRIVER_VULKAN;%(PreprocessorDefinitions)</PreprocessorDefinitions>
+      <PreprocessorDefinitions>REFRESH_DRIVER_D3D11;REFRESH_DRIVER_VULKAN;%(PreprocessorDefinitions)</PreprocessorDefinitions>
+      <AdditionalIncludeDirectories Condition="'$(Configuration)|$(Platform)'=='Debug|x64'">
+      </AdditionalIncludeDirectories>
    </ClCompile>
    <Link>
      <GenerateDebugInformation>DebugFull</GenerateDebugInformation>
@ -72,9 +74,11 @@
    <ClCompile>
      <WarningLevel>Level3</WarningLevel>
      <Optimization>MaxSpeed</Optimization>
-      <PreprocessorDefinitions>REFRESH_DRIVER_VULKAN;%(PreprocessorDefinitions)</PreprocessorDefinitions>
+      <PreprocessorDefinitions>REFRESH_DRIVER_D3D11;REFRESH_DRIVER_VULKAN;%(PreprocessorDefinitions)</PreprocessorDefinitions>
      <FunctionLevelLinking>true</FunctionLevelLinking>
      <IntrinsicFunctions>true</IntrinsicFunctions>
+      <AdditionalIncludeDirectories Condition="'$(Configuration)|$(Platform)'=='Release|x64'">
+      </AdditionalIncludeDirectories>
    </ClCompile>
    <Link>
      <GenerateDebugInformation>true</GenerateDebugInformation>
@ -84,6 +88,7 @@
  </ItemDefinitionGroup>
  <ItemGroup>
    <ClCompile Include="..\src\Refresh.c" />
+    <ClCompile Include="..\src\Refresh_Driver_D3D11.c" />
    <ClCompile Include="..\src\Refresh_Driver_Vulkan.c" />
    <ClCompile Include="..\src\Refresh_Image.c" />
  </ItemGroup>
@ -91,6 +96,7 @@
    <ClInclude Include="..\include\Refresh.h" />
    <ClInclude Include="..\include\Refresh_Image.h" />
    <ClInclude Include="..\src\Refresh_Driver.h" />
+    <ClInclude Include="..\src\Refresh_Driver_D3D11_cdefines.h" />
    <ClInclude Include="..\src\Refresh_Driver_Vulkan_vkfuncs.h" />
  </ItemGroup>
  <Import Project="$(VCTargetsPath)\Microsoft.Cpp.targets" />
--- a/visualc/Refresh.vcxproj.filters
+++ b/visualc/Refresh.vcxproj.filters
@ -10,6 +10,9 @@
    <ClCompile Include="..\src\Refresh_Image.c">
      <Filter>Source Files</Filter>
    </ClCompile>
+    <ClCompile Include="..\src\Refresh_Driver_D3D11.c">
+      <Filter>Source Files</Filter>
+    </ClCompile>
  </ItemGroup>
  <ItemGroup>
    <ClInclude Include="..\include\Refresh.h">
@ -24,6 +27,9 @@
    <ClInclude Include="..\include\Refresh_Image.h">
      <Filter>Header Files</Filter>
    </ClInclude>
+    <ClInclude Include="..\src\Refresh_Driver_D3D11_cdefines.h">
+      <Filter>Header Files</Filter>
+    </ClInclude>
  </ItemGroup>
  <ItemGroup>
    <Filter Include="Header Files">