feat: add FidelityFX-SDK-DX11 submodule

.gitmodules

@@ -4,3 +4,6 @@
 [submodule "extern/NVAPI"]
 	path = extern/NVAPI
 	url = https://github.com/NVIDIA/nvapi.git
+[submodule "extern/FidelityFX-SDK-DX11"]
+	path = extern/FidelityFX-SDK-DX11
+	url = https://github.com/metarutaiga/FidelityFX-SDK-DX11

CMakeLists.txt

@@ -43,6 +43,7 @@ find_package(cppwinrt CONFIG REQUIRED)
 find_package(unordered_dense CONFIG REQUIRED)
 find_package(efsw CONFIG REQUIRED)
 find_package(Tracy CONFIG REQUIRED)
+add_subdirectory(${CMAKE_SOURCE_DIR}/cmake/FidelityFX)
 
 set(NVAPI_INCLUDE_DIR "${CMAKE_SOURCE_DIR}/extern/nvapi/" CACHE STRING "Path to NVAPI include headers/shaders" )
 set(NVAPI_LIBRARY "${CMAKE_SOURCE_DIR}/extern/nvapi/amd64/nvapi64.lib" CACHE STRING "Path to NVAPI .lib file")
@@ -78,7 +79,8 @@ target_link_libraries(
 	unordered_dense::unordered_dense
 	efsw::efsw
 	Tracy::TracyClient
-	${NVAPI_LIBRARY} 
+	FidelityFX
+	${NVAPI_LIBRARY}
 )
 
 # https://gitlab.kitware.com/cmake/cmake/-/issues/24922#note_1371990

cmake/FidelityFX/CMakeLists.txt

@@ -0,0 +1,47 @@
+cmake_minimum_required(VERSION 3.15)
+
+set(FidelityFXPath "../../extern/FidelityFX-SDK-DX11")
+project(FidelityFX)
+
+set(SOURCES
+    ${FidelityFXPath}/DXBC/md5.h
+    ${FidelityFXPath}/FidelityFX/gpu/ffx_common_types.h
+    ${FidelityFXPath}/FidelityFX/gpu/ffx_core.h
+    ${FidelityFXPath}/FidelityFX/gpu/ffx_core_gpu_common.h
+    ${FidelityFXPath}/FidelityFX/gpu/ffx_core_gpu_common_half.h
+    ${FidelityFXPath}/FidelityFX/gpu/ffx_core_hlsl.h
+    ${FidelityFXPath}/FidelityFX/gpu/ffx_core_portability.h
+    ${FidelityFXPath}/FidelityFX/host/ffx_assert.h
+    ${FidelityFXPath}/FidelityFX/host/ffx_error.h
+    ${FidelityFXPath}/FidelityFX/host/ffx_interface.h
+    ${FidelityFXPath}/FidelityFX/host/ffx_types.h
+    ${FidelityFXPath}/FidelityFX/host/ffx_util.h
+    ${FidelityFXPath}/FidelityFX/host/shared/ffx_object_management.h
+    ${FidelityFXPath}/DXBC/DXBCChecksum.c
+    ${FidelityFXPath}/DXBC/md5.c
+    ${FidelityFXPath}/FidelityFX/host/shared/ffx_assert.cpp
+    ${FidelityFXPath}/FidelityFX/host/shared/ffx_object_management.cpp
+    ${FidelityFXPath}/FidelityFX/host/backends/dx11/ffx_dx11.cpp
+    ${FidelityFXPath}/FidelityFX/host/components/frameinterpolation/ffx_frameinterpolation.cpp
+    ${FidelityFXPath}/FidelityFX/host/backends/ffx_shader_blobs.cpp)
+
+add_library(${PROJECT_NAME} STATIC ${SOURCES})
+
+target_compile_features(${PROJECT_NAME} PUBLIC cxx_std_23)
+
+if(MSVC)
+  target_compile_options(
+    ${PROJECT_NAME}
+    PUBLIC # disable warnings
+           /wd4065
+           /wd4100
+           /wd4189
+           /wd4324
+           /wd4456
+           /wd4505
+           /wd4996)
+endif()
+
+target_include_directories(
+  ${PROJECT_NAME} PUBLIC ${FidelityFXPath} ${FidelityFXPath}/FidelityFX
+                         ${FidelityFXPath}/FidelityFX/host/shared)

src/State.cpp

@@ -16,6 +16,9 @@
 
 #include "VariableRateShading.h"
 
+#include "FidelityFX/host/backends/dx11/ffx_dx11.h"
+#include "FidelityFX/host/ffx_fsr3.h"
+
 enum class PermutationFlags : uint32_t
 {
 	InWorld = 1 << 24,
@@ -385,6 +388,27 @@ void State::SetupResources()
 	context->QueryInterface(__uuidof(pPerf), reinterpret_cast<void**>(&pPerf));
 
 	tracyCtx = TracyD3D11Context(device, context);
+
+	FfxDevice fsrDevice = ffxGetDeviceDX11(State::GetSingleton()->device);
+
+	size_t scratchBufferSize = ffxGetScratchMemorySizeDX11(1);
+	void* scratchBuffer = malloc(scratchBufferSize);
+	memset(scratchBuffer, 0, scratchBufferSize);
+
+	FfxInterface backendInterface;
+	ffxGetInterfaceDX11(&backendInterface, fsrDevice, scratchBuffer, scratchBufferSize, 1);
+
+	FfxFrameInterpolationContext* fgContext = nullptr;
+	FfxFrameInterpolationContextDescription fgDescription;
+	fgDescription.flags = 0;
+	fgDescription.maxRenderSize = { (uint)State::GetSingleton()->screenSize.x, (uint)State::GetSingleton()->screenSize.y };
+	fgDescription.displaySize = fgDescription.maxRenderSize;
+	fgDescription.backBufferFormat = FFX_SURFACE_FORMAT_R8G8B8A8_UNORM;
+	fgDescription.backendInterface = backendInterface;
+
+	auto result = ffxFrameInterpolationContextCreate(fgContext, &fgDescription);
+
+	logger::info("{}", result == FFX_OK ? "ok" : "not ok");
 }
 
 void State::ModifyShaderLookup(const RE::BSShader& a_shader, uint& a_vertexDescriptor, uint& a_pixelDescriptor, bool a_forceDeferred)