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Add SwapBuffers request

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Add a SwapBuffers request for requesting a front<->back swap.  Returns a
whole new set of buffers to the client to allow for triple buffering
etc.
This commit is contained in:
Jesse Barnes 2009-05-01 14:41:55 -07:00
parent 66c56ab10d
commit 9b5ef83c0b
2 changed files with 65 additions and 1 deletions
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25
dri2proto.h
View file

@ -35,7 +35,7 @@
#define DRI2_NAME "DRI2"
#define DRI2_MAJOR 1
#define DRI2_MINOR 1
#define DRI2_MINOR 2
#define DRI2NumberErrors 0
#define DRI2NumberEvents 0
@ -49,6 +49,7 @@
#define X_DRI2GetBuffers 5
#define X_DRI2CopyRegion 6
#define X_DRI2GetBuffersWithFormat 7
#define X_DRI2SwapBuffers 8
typedef struct {
CARD32 attachment B32;
@ -191,4 +192,26 @@ typedef struct {
} xDRI2CopyRegionReply;
#define sz_xDRI2CopyRegionReply 32
typedef struct {
CARD8 reqType;
CARD8 dri2ReqType;
CARD16 length B16;
CARD32 drawable B32;
} xDRI2SwapBuffersReq;
#define sz_xDRI2SwapBuffersReq 8
typedef struct {
BYTE type; /* X_Reply */
BYTE pad1;
CARD16 sequenceNumber B16;
CARD32 length B32;
CARD32 count B32;
CARD32 pad3 B32;
CARD32 pad4 B32;
CARD32 pad5 B32;
CARD32 pad6 B32;
CARD32 pad7 B32;
} xDRI2SwapBuffersReply;
#define sz_xDRI2SwapBuffersReply 32
#endif

41
dri2proto.txt
View file

@ -105,6 +105,11 @@ DRI2 implementation of direct rendering GLX, should use these enty
points to copy contents back and forth to as necessary to ensure
consistent rendering.
The client may also use the DRI2SwapBuffers function to request a swap
of the front and back buffers. If the display server supports it, this
operation may be preferred, since it may be easier and/or more performant
for the server to perform a simple buffer swap rather than a blit.
⚙ ⚙ ⚙ ⚙ ⚙ ⚙
@ -288,6 +293,21 @@ The name of this extension is "DRI2".
the server has seen the request before proceeding with
rendering the next frame.
┌───
DRI2SwapBuffers
drawable: DRAWABLE
▶
buffers: LISTofDRI2BUFFER
└───
Errors: Window
Schedule a swap of the front and back buffers with the display
server.
In reply, the display server is expected to provide new front
and back buffers to the client following this request. The
display server should process this request asynchronously
if possible, to prevent the client from blocking.
┌───
DRI2GetBuffersWithFormat
@ -542,6 +562,27 @@ A.3 Protocol Events
The DRI2 extension specifies no events.
┌───
DRI2SwapBuffers
1 CARD8 major opcode
1 7 DRI2 opcode
2 8 length
4 DRAWABLE drawable
▶
1 1 Reply
1 unused
2 CARD16 sequence number
4 0 reply length
4 CARD32 buffer count
4 CARD32 unused
4 CARD32 unused
4 CARD32 unused
4 CARD32 unused
4 CARD32 unused
4 CARD32 unused
5n LISTofDRI2BUFFER buffers
└───
A.4 Protocol Errors