GPU (Windows): restores Win8.1 support

Author: CarterLi

src/detection/gpu/d3dkmthk.h

@@ -43,7 +43,7 @@ typedef int32_t NTSTATUS; // 0 for success, -1 for failure
 #endif
 
 #define D3DKMT_ALIGN64 __attribute__((aligned(8)))
-#define MAX_ENUM_ADAPTERS 16
+#define _In_range_(a, b)
 
 typedef struct D3DKMT_HANDLE {
     union {
@@ -68,6 +68,13 @@ typedef struct _D3DKMT_ADAPTERINFO {
     BOOL bPrecisePresentRegionsPreferred;
 } D3DKMT_ADAPTERINFO;
 
+#define MAX_ENUM_ADAPTERS 16
+typedef struct _D3DKMT_ENUMADAPTERS
+{
+    _In_range_(0, MAX_ENUM_ADAPTERS) ULONG  NumAdapters;
+    D3DKMT_ADAPTERINFO                      Adapters[MAX_ENUM_ADAPTERS];
+} D3DKMT_ENUMADAPTERS;
+
 typedef struct _D3DKMT_ENUMADAPTERS2 {
     ULONG NumAdapters;             // in/out: On input, the count of the pAdapters array buffer.  On output, the number of adapters enumerated.
     D3DKMT_ADAPTERINFO* pAdapters; // out: Array of enumerated adapters containing NumAdapters elements
@@ -319,7 +326,8 @@ static_assert(sizeof(D3DKMT_NODEMETADATA) == 0x4E, "D3DKMT_NODEMETADATA structur
 EXTERN_C _Check_return_ NTSTATUS APIENTRY D3DKMTOpenAdapterFromLuid(_Inout_ CONST D3DKMT_OPENADAPTERFROMLUID*);
 EXTERN_C _Check_return_ NTSTATUS APIENTRY D3DKMTQueryAdapterInfo(_Inout_ CONST D3DKMT_QUERYADAPTERINFO*);
 EXTERN_C _Check_return_ NTSTATUS APIENTRY D3DKMTCloseAdapter(_In_ CONST D3DKMT_CLOSEADAPTER*);
-EXTERN_C _Check_return_ NTSTATUS APIENTRY D3DKMTEnumAdapters2(_Inout_ D3DKMT_ENUMADAPTERS2*);
+EXTERN_C _Check_return_ NTSTATUS APIENTRY D3DKMTEnumAdapters(_Inout_ CONST D3DKMT_ENUMADAPTERS*);
+EXTERN_C _Check_return_ NTSTATUS APIENTRY D3DKMTEnumAdapters2(_Inout_ CONST D3DKMT_ENUMADAPTERS2*);
 EXTERN_C _Check_return_ NTSTATUS APIENTRY D3DKMTQueryStatistics(_In_ CONST D3DKMT_QUERYSTATISTICS*);
 
 #else

src/detection/gpu/gpu_windows.c

@@ -74,18 +74,24 @@ ffGPUDetectWsl2
     }
 #endif
 
+#if FF_WIN81_COMPAT
+    D3DKMT_ENUMADAPTERS enumAdapters = {};
+    D3DKMT_ADAPTERINFO* const adapters = enumAdapters.Adapters;
+    NTSTATUS status = D3DKMTEnumAdapters(&enumAdapters);
+#else
     D3DKMT_ADAPTERINFO adapters[64];
     D3DKMT_ENUMADAPTERS2 enumAdapters = {
         .NumAdapters = ARRAY_SIZE(adapters),
         .pAdapters = adapters,
     };
     NTSTATUS status = D3DKMTEnumAdapters2(&enumAdapters);
+#endif
     if (!NT_SUCCESS(status)) {
-        FF_DEBUG("D3DKMTEnumAdapters2 failed: %s", ffDebugNtStatus(status));
+        FF_DEBUG("D3DKMTEnumAdapters(2) failed: %s", ffDebugNtStatus(status));
         return "Failed to enumerate adapters with D3DKMTEnumAdapters2";
     }
 
-    FF_DEBUG("D3DKMTEnumAdapters2 succeeded, adapter count: %" PRIu32, (uint32_t) enumAdapters.NumAdapters);
+    FF_DEBUG("D3DKMTEnumAdapters(2) succeeded, adapter count: %" PRIu32, (uint32_t) enumAdapters.NumAdapters);
 
     for (uint32_t i = 0; i < enumAdapters.NumAdapters; i++) {
         const D3DKMT_ADAPTERINFO* adapter = &adapters[i];