Some small fixes with Windows/DX usage (#2797)

* Correct case of windows.h includes

* Use Slang::SharedLibrary to load directx dlls

* s/max/std::max/

* Factor common OS code in calcHasApi

* Add DXIL test for compute/simple

* s/false/FALSE for calls to WinAPI functions

* Factor common OS code in gfxGetAdapters

* 2 missing headers

d3d12sdklayers for ID3DDebug

climits for UINT_MAX

* Define out unused function on Linux

* Only try to load Vulkan and CUDA on Windows or Linux

* simplify D3DUtil::getDxgiModule

* Remove WIN32_LEAN_AND_MEAN &co from source files

Add a global define

* Set WIN32_LEAN_AND_MEAN &friends in headers

Restore previous state also

* regenerate vs projects

1 files changed, 18 insertions, 31 deletions

diff --git a/source/core/slang-render-api-util.cpp b/source/core/slang-render-api-util.cpp
index bc15a8164..fa39f46ee 100644
--- a/source/core/slang-render-api-util.cpp
+++ b/source/core/slang-render-api-util.cpp
@@ -261,41 +261,28 @@ static bool _canLoadSharedLibrary(const char* libName)
 
 /* static */bool RenderApiUtil::calcHasApi(RenderApiType type)
 {
-#if SLANG_WINDOWS_FAMILY
     switch (type)
     {
-        case RenderApiType::OpenGl:    return _canLoadSharedLibrary("opengl32");
-        case RenderApiType::Vulkan:    return _canLoadSharedLibrary("vulkan-1") || _canLoadSharedLibrary("vk_swiftshader");
-        case RenderApiType::D3D11:     return _canLoadSharedLibrary("d3d11"); 
-        case RenderApiType::D3D12:     return _canLoadSharedLibrary("d3d12");
-        case RenderApiType::CPU:       return true;
-        case RenderApiType::CUDA:
-        {
-            // We'll assume it's available, and if not trying to create it will detect it
-            return true;
-        }
-        default: break; 
-    }
+#if SLANG_WINDOWS_FAMILY
+        case RenderApiType::OpenGl: return _canLoadSharedLibrary("opengl32");
+        case RenderApiType::Vulkan: return _canLoadSharedLibrary("vulkan-1") || _canLoadSharedLibrary("vk_swiftshader");
+        case RenderApiType::D3D11:  return _canLoadSharedLibrary("d3d11");
+        case RenderApiType::D3D12:  return _canLoadSharedLibrary("d3d12");
 #elif SLANG_UNIX_FAMILY
-    // Assume on unix target we never have D3D
-    switch (type)
-    {
-        case RenderApiType::OpenGl:
-        case RenderApiType::Vulkan:
-        {
-            return true;
-        }
-        case RenderApiType::CPU:
-        {
-            return true;
-        }
-        case RenderApiType::CUDA:
-        {
-            return true;
-        }
-        default: break; 
-    }
+        case RenderApiType::D3D11:  return false;
+        case RenderApiType::D3D12:  return false;
+        // The below can be used once they're confirmed working with gfx
+        // case RenderApiType::D3D11:  return _canLoadSharedLibrary("dxvk_d3d11");
+        // case RenderApiType::D3D12:  return _canLoadSharedLibrary("vkd3d-proton-d3d12");
+
+        case RenderApiType::OpenGl: return true;
+        case RenderApiType::Vulkan: return true;
 #endif
+        case RenderApiType::CPU:    return true;
+        // We'll assume CUDA is available, and if not, trying to create it will detect it
+        case RenderApiType::CUDA:   return true;
+        default: break;
+    }
     return false;
 }