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, 10 deletions

diff --git a/tools/gfx/d3d/d3d-util.cpp b/tools/gfx/d3d/d3d-util.cpp
index 05a948773..eece71c16 100644
--- a/tools/gfx/d3d/d3d-util.cpp
+++ b/tools/gfx/d3d/d3d-util.cpp
@@ -10,6 +10,7 @@
 #include <stdio.h>
 
 #include "core/slang-basic.h"
+#include "core/slang-platform.h"
 
 namespace gfx {
 using namespace Slang;
@@ -498,15 +499,22 @@ bool D3DUtil::isTypeless(DXGI_FORMAT format)
     }
 }
 
-/* static */HMODULE D3DUtil::getDxgiModule()
+/* static */SharedLibrary::Handle D3DUtil::getDxgiModule()
 {
-    static HMODULE s_dxgiModule = LoadLibraryA("dxgi.dll");
-    if (!s_dxgiModule)
-    {
-        fprintf(stderr, "error: failed load 'dxgi.dll'\n");
-        return nullptr;
-    }
-
+#if SLANG_WINDOWS_FAMILY
+    const char* const libPath = "dxgi";
+#else
+    const char* const libPath = "dxvk_dxgi";
+#endif
+    static SharedLibrary::Handle s_dxgiModule = [&](){
+        SharedLibrary::Handle h = nullptr;
+        SharedLibrary::load(libPath, h);
+        if (!h)
+        {
+            fprintf(stderr, "error: failed to load dll '%s'\n", libPath);
+        }
+        return h;
+    }();
     return s_dxgiModule;
 }
 
@@ -522,7 +530,7 @@ bool D3DUtil::isTypeless(DXGI_FORMAT format)
     typedef HRESULT(WINAPI *PFN_DXGI_CREATE_FACTORY_2)(UINT Flags, REFIID riid, _COM_Outptr_ void **ppFactory);
 
     {
-        auto createFactory2 = (PFN_DXGI_CREATE_FACTORY_2)::GetProcAddress(dxgiModule, "CreateDXGIFactory2");
+        auto createFactory2 = (PFN_DXGI_CREATE_FACTORY_2)SharedLibrary::findSymbolAddressByName(dxgiModule, "CreateDXGIFactory2");
         if (createFactory2)
         {
             UINT dxgiFlags = 0;
@@ -541,7 +549,7 @@ bool D3DUtil::isTypeless(DXGI_FORMAT format)
     }
 
     {
-        auto createFactory = (PFN_DXGI_CREATE_FACTORY)::GetProcAddress(dxgiModule, "CreateDXGIFactory");
+        auto createFactory = (PFN_DXGI_CREATE_FACTORY)SharedLibrary::findSymbolAddressByName(dxgiModule, "CreateDXGIFactory");
         if (!createFactory)
         {
             fprintf(stderr, "error: failed load symbol '%s'\n", "CreateDXGIFactory");