gpu: Add D3D12_ALLOW_FEWER_RESOURCE_SLOTS_BOOLEAN property

include/SDL3/SDL_gpu.h

@@ -2259,6 +2259,11 @@ extern SDL_DECLSPEC SDL_GPUDevice * SDLCALL SDL_CreateGPUDevice(
  *
  * - `SDL_PROP_GPU_DEVICE_CREATE_D3D12_SEMANTIC_NAME_STRING`: the prefix to
  *   use for all vertex semantics, default is "TEXCOORD".
+ * - `SDL_PROP_GPU_DEVICE_CREATE_D3D12_ALLOW_FEWER_RESOURCE_SLOTS_BOOLEAN`:
+ *   By default, Resourcing Binding Tier 2 is required for D3D12 support.
+ *   However, an application can enable this property to enable Tier 1 support,
+ *   if (and only if) the application uses 8 or fewer storage resources across
+ *   all shader stages.
  *
  * With the Vulkan renderer:
  *
@@ -2293,21 +2298,22 @@ extern SDL_DECLSPEC SDL_GPUDevice * SDLCALL SDL_CreateGPUDevice(
 extern SDL_DECLSPEC SDL_GPUDevice * SDLCALL SDL_CreateGPUDeviceWithProperties(
     SDL_PropertiesID props);
 
-#define SDL_PROP_GPU_DEVICE_CREATE_DEBUGMODE_BOOLEAN                 "SDL.gpu.device.create.debugmode"
-#define SDL_PROP_GPU_DEVICE_CREATE_PREFERLOWPOWER_BOOLEAN            "SDL.gpu.device.create.preferlowpower"
-#define SDL_PROP_GPU_DEVICE_CREATE_VERBOSE_BOOLEAN                   "SDL.gpu.device.create.verbose"
-#define SDL_PROP_GPU_DEVICE_CREATE_NAME_STRING                       "SDL.gpu.device.create.name"
-#define SDL_PROP_GPU_DEVICE_CREATE_SHADERS_PRIVATE_BOOLEAN           "SDL.gpu.device.create.shaders.private"
-#define SDL_PROP_GPU_DEVICE_CREATE_SHADERS_SPIRV_BOOLEAN             "SDL.gpu.device.create.shaders.spirv"
-#define SDL_PROP_GPU_DEVICE_CREATE_SHADERS_DXBC_BOOLEAN              "SDL.gpu.device.create.shaders.dxbc"
-#define SDL_PROP_GPU_DEVICE_CREATE_SHADERS_DXIL_BOOLEAN              "SDL.gpu.device.create.shaders.dxil"
-#define SDL_PROP_GPU_DEVICE_CREATE_SHADERS_MSL_BOOLEAN               "SDL.gpu.device.create.shaders.msl"
-#define SDL_PROP_GPU_DEVICE_CREATE_SHADERS_METALLIB_BOOLEAN          "SDL.gpu.device.create.shaders.metallib"
-#define SDL_PROP_GPU_DEVICE_CREATE_D3D12_SEMANTIC_NAME_STRING        "SDL.gpu.device.create.d3d12.semantic"
-#define SDL_PROP_GPU_DEVICE_CREATE_VULKAN_SHADERCLIPDISTANCE_BOOLEAN "SDL.gpu.device.create.vulkan.shaderclipdistance"
-#define SDL_PROP_GPU_DEVICE_CREATE_VULKAN_DEPTHCLAMP_BOOLEAN         "SDL.gpu.device.create.vulkan.depthclamp"
-#define SDL_PROP_GPU_DEVICE_CREATE_VULKAN_DRAWINDIRECTFIRST_BOOLEAN  "SDL.gpu.device.create.vulkan.drawindirectfirstinstance"
-#define SDL_PROP_GPU_DEVICE_CREATE_VULKAN_SAMPLERANISOTROPY_BOOLEAN  "SDL.gpu.device.create.vulkan.sampleranisotropy"
+#define SDL_PROP_GPU_DEVICE_CREATE_DEBUGMODE_BOOLEAN                        "SDL.gpu.device.create.debugmode"
+#define SDL_PROP_GPU_DEVICE_CREATE_PREFERLOWPOWER_BOOLEAN                   "SDL.gpu.device.create.preferlowpower"
+#define SDL_PROP_GPU_DEVICE_CREATE_VERBOSE_BOOLEAN                          "SDL.gpu.device.create.verbose"
+#define SDL_PROP_GPU_DEVICE_CREATE_NAME_STRING                              "SDL.gpu.device.create.name"
+#define SDL_PROP_GPU_DEVICE_CREATE_SHADERS_PRIVATE_BOOLEAN                  "SDL.gpu.device.create.shaders.private"
+#define SDL_PROP_GPU_DEVICE_CREATE_SHADERS_SPIRV_BOOLEAN                    "SDL.gpu.device.create.shaders.spirv"
+#define SDL_PROP_GPU_DEVICE_CREATE_SHADERS_DXBC_BOOLEAN                     "SDL.gpu.device.create.shaders.dxbc"
+#define SDL_PROP_GPU_DEVICE_CREATE_SHADERS_DXIL_BOOLEAN                     "SDL.gpu.device.create.shaders.dxil"
+#define SDL_PROP_GPU_DEVICE_CREATE_SHADERS_MSL_BOOLEAN                      "SDL.gpu.device.create.shaders.msl"
+#define SDL_PROP_GPU_DEVICE_CREATE_SHADERS_METALLIB_BOOLEAN                 "SDL.gpu.device.create.shaders.metallib"
+#define SDL_PROP_GPU_DEVICE_CREATE_D3D12_ALLOW_FEWER_RESOURCE_SLOTS_BOOLEAN "SDL.gpu.device.create.d3d12.allowtier1resourcebinding"
+#define SDL_PROP_GPU_DEVICE_CREATE_D3D12_SEMANTIC_NAME_STRING               "SDL.gpu.device.create.d3d12.semantic"
+#define SDL_PROP_GPU_DEVICE_CREATE_VULKAN_SHADERCLIPDISTANCE_BOOLEAN        "SDL.gpu.device.create.vulkan.shaderclipdistance"
+#define SDL_PROP_GPU_DEVICE_CREATE_VULKAN_DEPTHCLAMP_BOOLEAN                "SDL.gpu.device.create.vulkan.depthclamp"
+#define SDL_PROP_GPU_DEVICE_CREATE_VULKAN_DRAWINDIRECTFIRST_BOOLEAN         "SDL.gpu.device.create.vulkan.drawindirectfirstinstance"
+#define SDL_PROP_GPU_DEVICE_CREATE_VULKAN_SAMPLERANISOTROPY_BOOLEAN         "SDL.gpu.device.create.vulkan.sampleranisotropy"
 
 /**
  * Destroys a GPU context previously returned by SDL_CreateGPUDevice.

src/gpu/d3d12/SDL_gpu_d3d12.c

@@ -8501,8 +8501,8 @@ static bool D3D12_PrepareDriver(SDL_VideoDevice *_this, SDL_PropertiesID props)
     SDL_UnloadObject(d3d12Dll);
     SDL_UnloadObject(dxgiDll);
 
-    if (!supports_64UAVs) {
-        SDL_LogWarn(SDL_LOG_CATEGORY_GPU, "D3D12: Tier 2 Resource binding is not supported");
+    if (!supports_64UAVs && !SDL_GetBooleanProperty(props, SDL_PROP_GPU_DEVICE_CREATE_D3D12_ALLOW_FEWER_RESOURCE_SLOTS_BOOLEAN, false)) {
+        SDL_LogWarn(SDL_LOG_CATEGORY_GPU, "D3D12: Tier 2 Resource Binding is not supported");
         return false;
     }