Changeset 913 for trunk/src/ddraw/OS2DDRAW.H

Timestamp:

Sep 12, 1999, 11:37:37 PM (26 years ago)

Author:

hugh

Message:

Changess in basic implementation of the IDrectDraw class
MS does assume 2 Vtables at the end and MS tools seam to use internal
knownledge of the implmentation. DDCAPS is one butn thsi does work/start now.

File:

• trunk/src/ddraw/OS2DDRAW.H (modified) (1 diff)

trunk/src/ddraw/OS2DDRAW.H

@@ -19 +19 @@
     //this one has to go first!
     IDirectDraw4Vtbl *lpVtbl;
+    IDirectDraw4Vtbl *lpVtbl2;         // 2nd Vtable pointer An other MS assumtion see below
+    DWORD            *pdwUnknownData;  // MS DDCAPS (DX6 SDK bin\tools )program makes an assumtion that after the
+                                       // VTable comes a pointer to some data
+                                       // to avoid crashes we do it a favor and alloc a buffer
+                                       // with 255 DWORDS
+                                       // Known data in the buffer Height(offset 235),
+                                       // Height (236),  Bits (241)
+                                       // ToDO :
+                                       // debug into DirectDrawCreate and se what MS is doing !
     IDirectDraw2Vtbl  Vtbl;
     // MS did it again with direct/X 6 they changed the behavior of the directdraw component