[util] Add helpers for shared resource metadata access.

src/util/meson.build

@@ -6,6 +6,7 @@ util_src = files([
   'util_luid.cpp',
   'util_matrix.cpp',
   'util_monitor.cpp',
+  'util_shared_res.cpp',
   
   'com/com_guid.cpp',
   'com/com_private_data.cpp',

src/util/util_shared_res.cpp

@@ -0,0 +1,46 @@
+#include "util_shared_res.h"
+
+#include "winioctl.h"
+
+namespace dxvk {
+
+  #define IOCTL_SHARED_GPU_RESOURCE_OPEN             CTL_CODE(FILE_DEVICE_VIDEO, 1, METHOD_BUFFERED, FILE_WRITE_ACCESS)
+
+  HANDLE openKmtHandle(HANDLE kmt_handle) {
+    HANDLE handle = ::CreateFileA("\\\\.\\SharedGpuResource", GENERIC_READ | GENERIC_WRITE, 0, NULL, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL);
+    if (handle == INVALID_HANDLE_VALUE)
+      return handle;
+
+    struct
+    {
+        unsigned int kmt_handle;
+        WCHAR name[1];
+    } shared_resource_open = {0};
+    shared_resource_open.kmt_handle = reinterpret_cast<uintptr_t>(kmt_handle);
+
+    bool succeed = ::DeviceIoControl(handle, IOCTL_SHARED_GPU_RESOURCE_OPEN, &shared_resource_open, sizeof(shared_resource_open), NULL, 0, NULL, NULL);
+    if (!succeed) {
+      ::CloseHandle(handle);
+      return INVALID_HANDLE_VALUE;
+    }
+    return handle; 
+  }
+
+  #define IOCTL_SHARED_GPU_RESOURCE_SET_METADATA           CTL_CODE(FILE_DEVICE_VIDEO, 4, METHOD_BUFFERED, FILE_WRITE_ACCESS)
+
+  bool setSharedMetadata(HANDLE handle, void *buf, uint32_t bufSize) {
+    DWORD retSize;
+    return ::DeviceIoControl(handle, IOCTL_SHARED_GPU_RESOURCE_SET_METADATA, buf, bufSize, NULL, 0, &retSize, NULL);
+  }
+
+  #define IOCTL_SHARED_GPU_RESOURCE_GET_METADATA           CTL_CODE(FILE_DEVICE_VIDEO, 5, METHOD_BUFFERED, FILE_READ_ACCESS)
+
+  bool getSharedMetadata(HANDLE handle, void *buf, uint32_t bufSize, uint32_t *metadataSize) {
+    DWORD retSize;
+    bool ret = ::DeviceIoControl(handle, IOCTL_SHARED_GPU_RESOURCE_GET_METADATA, NULL, 0, buf, bufSize, &retSize, NULL);
+    if (metadataSize)
+      *metadataSize = retSize;
+    return ret;
+  }
+
+}

src/util/util_shared_res.h

@@ -0,0 +1,30 @@
+#pragma once
+
+#include <cstdint>
+
+#include "./com/com_include.h"
+
+#include <d3d11_4.h>
+
+namespace dxvk {
+
+    HANDLE openKmtHandle(HANDLE kmt_handle);
+
+    bool setSharedMetadata(HANDLE handle, void *buf, uint32_t bufSize);
+    bool getSharedMetadata(HANDLE handle, void *buf, uint32_t bufSize, uint32_t *metadataSize);
+
+    struct DxvkSharedTextureMetadata {
+      UINT             Width;
+      UINT             Height;
+      UINT             MipLevels;
+      UINT             ArraySize;
+      DXGI_FORMAT      Format;
+      DXGI_SAMPLE_DESC SampleDesc;
+      D3D11_USAGE      Usage;
+      UINT             BindFlags;
+      UINT             CPUAccessFlags;
+      UINT             MiscFlags;
+      D3D11_TEXTURE_LAYOUT TextureLayout;
+    };
+
+}