d3dx9: Correctly handle D3DUSAGE_AUTOGENMIPMAP in D3DXCheckVolumeTextureRequirements.

dlls/d3dx9_36/tests/texture.c

@@ -517,6 +517,26 @@ static void test_D3DXCheckVolumeTextureRequirements(IDirect3DDevice9 *device)
     hr = D3DXCheckVolumeTextureRequirements(device, NULL, NULL, NULL, &mipmaps, 0, NULL, D3DPOOL_DEFAULT);
     ok(hr == D3D_OK, "D3DXCheckVolumeTextureRequirements returned %#x, expected %#x\n", hr, D3D_OK);
     ok(mipmaps == 9, "Returned mipmaps %d, expected %d\n", mipmaps, 9);
+
+    if (!is_autogenmipmap_supported(device, D3DRTYPE_VOLUMETEXTURE))
+    {
+        skip("No D3DUSAGE_AUTOGENMIPMAP support for volume textures\n");
+        return;
+    }
+
+    /* mipmaps when D3DUSAGE_AUTOGENMIPMAP is set */
+    mipmaps = 0;
+    hr = D3DXCheckVolumeTextureRequirements(device, NULL, NULL,NULL, &mipmaps, D3DUSAGE_AUTOGENMIPMAP, NULL, D3DPOOL_DEFAULT);
+    ok(hr == D3D_OK, "D3DXCheckVolumeTextureRequirements returned %#x, expected %#x\n", hr, D3D_OK);
+    ok(mipmaps == 0, "Returned mipmaps %d, expected %d\n", mipmaps, 0);
+    mipmaps = 1;
+    hr = D3DXCheckVolumeTextureRequirements(device, NULL, NULL,NULL, &mipmaps, D3DUSAGE_AUTOGENMIPMAP, NULL, D3DPOOL_DEFAULT);
+    ok(hr == D3D_OK, "D3DXCheckVolumeTextureRequirements returned %#x, expected %#x\n", hr, D3D_OK);
+    ok(mipmaps == 1, "Returned mipmaps %d, expected %d\n", mipmaps, 1);
+    mipmaps = 3;
+    hr = D3DXCheckVolumeTextureRequirements(device, NULL, NULL,NULL, &mipmaps, D3DUSAGE_AUTOGENMIPMAP, NULL, D3DPOOL_DEFAULT);
+    ok(hr == D3D_OK, "D3DXCheckVolumeTextureRequirements returned %#x, expected %#x\n", hr, D3D_OK);
+    ok(mipmaps == 0, "Returned mipmaps %d, expected %d\n", mipmaps, 0);
 }
 
 static void test_D3DXCreateTexture(IDirect3DDevice9 *device)

dlls/d3dx9_36/texture.c

@@ -436,6 +436,11 @@ HRESULT WINAPI D3DXCheckVolumeTextureRequirements(LPDIRECT3DDEVICE9 device,
     {
         if (!(caps.TextureCaps & D3DPTEXTURECAPS_MIPVOLUMEMAP))
             *miplevels = 1;
+        else if ((usage & D3DUSAGE_AUTOGENMIPMAP))
+        {
+            if (*miplevels > 1)
+                *miplevels = 0;
+        }
         else
         {
             UINT max_mipmaps = 1;