DRI2 Event BufferSwapComplete too long for core protocol?
Ian Romanick
idr at freedesktop.org
Thu Dec 16 12:19:29 PST 2010
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On 11/28/2010 09:57 PM, Mikko Markus Torni wrote:
> I was updating my local dri2.xml based on the latest dri2proto.h [1]
> and I noticed that the DRI2 event BufferSwapComplete is too long to fit
> core protocol events.
>
> The best I can calculate is
> sizeof(xDRI2BufferSwapComplete) == 34
> which disagrees with
> #define sz_xDRI2BufferSwapComplete 32
>
> I suppose if event_type would be a CARD8, it could fit where the padding
> is now and the length discrepancy would be fixed.
>
> Any comments?
>
> ---
>
> /* Excerpt from dri2proto.h */
> typedef struct {
> CARD8 type;
> CARD8 pad;
> CARD16 sequenceNumber B16;
> CARD16 event_type B16;
> CARD32 drawable B32;
> CARD32 ust_hi B32;
> CARD32 ust_lo B32;
> CARD32 msc_hi B32;
> CARD32 msc_lo B32;
> CARD32 sbc_hi B32;
> CARD32 sbc_lo B32;
> } xDRI2BufferSwapComplete;
> #define sz_xDRI2BufferSwapComplete 32
There was a similar issue in the protocol for the GLX_INTEL_swap_event
spec. It got fixed there, and I thought Jesse fixed it in the DRI2
extension as well.
> /* Excerpt from dri2tokens.h */
> /* Event sub-types for the swap complete event */
> #define DRI2_EXCHANGE_COMPLETE 0x1
> #define DRI2_BLIT_COMPLETE 0x2
> #define DRI2_FLIP_COMPLETE 0x3
>
> [1] http://cgit.freedesktop.org/xorg/proto/dri2proto/tree/dri2proto.h
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