diff options
Diffstat (limited to 'dri2proto.txt')
| -rw-r--r-- | dri2proto.txt | 182 |
1 files changed, 173 insertions, 9 deletions
diff --git a/dri2proto.txt b/dri2proto.txt index 1bad3b9..6430b2a 100644 --- a/dri2proto.txt +++ b/dri2proto.txt @@ -110,6 +110,17 @@ 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. +2.6 Synchronizing rendering + +DRI2 provides several methods for synchronizing drawing with various events. +The protocol for these methods is based on the SGI_video_sync and +OML_sync_control GLX extensions. Using the DRI2WaitMSC request, a client +can wait for a specific frame count or divisor/remainder before continuing +its processing. With the DRI2WaitSBC request, clients can block until a given +swap count is reached (as incremented by DRI2SwapBuffers). Finally, using +DRI2SwapBuffers, clients can limit their frame rate by specifying a swap +interval using the swap interval call (currently only available through GLX) +or by using the OML swap buffers routine. ⚙ ⚙ ⚙ ⚙ ⚙ ⚙ @@ -297,17 +308,22 @@ The name of this extension is "DRI2". DRI2SwapBuffers drawable: DRAWABLE ▶ - buffers: LISTofDRI2BUFFER + count: two CARD32s └─── Errors: Window Schedule a swap of the front and back buffers with the display server. - This request has no reply. The server is expected to either perform - a buffer exchange or queue one before returning. The client should - invalidate its render buffers after sending this request, causing - a subsequent GetBuffers request to get updated buffer info. + Returns the swap count value when the swap will actually occur (e.g. + the last queued swap count + (pending swap count * swap interval)). + + The client should invalidate its render buffers after sending this + request, causing a subsequent GetBuffers request to get updated buffer + info. + + This request is only available with protocol version 1.2 or + later. ┌─── DRI2GetBuffersWithFormat @@ -334,6 +350,68 @@ The name of this extension is "DRI2". This request is only available with protocol version 1.1 or later. +┌─── + DRI2GetMSC + drawable: DRAWABLE + ▶ + ust, msc, sbc: CARD64 +└─── + Errors: Window + + Get the current media stamp counter (MSC) and swap buffer count (SBC) + along with the unadjusted system time (UST) when the MSC was last + incremented. + + This request is only available with protocol version 1.2 or + later. + +┌─── + DRI2WaitMSC + drawable: DRAWABLE + target_msc: two CARD32s + divisor: two CARD32s + remainder: two CARD32s + ▶ + ust, msc, sbc: CARD64 +└─── + Errors: Window + + Blocks the client until either the frame count reaches target_msc or, + if the frame count is already greater than target_msc when the request + is received, until the frame count % divisor = remainder. If divisor + is 0, the client will be unblocked if the frame count is greater than + or equal to the target_msc. + + Returns the current media stamp counter (MSC) and swap buffer count + (SBC) along with the unadjusted system time (UST) when the MSC was last + incremented. + + This request is only available with protocol version 1.2 or + later. + +┌─── + DRI2WaitSBC + drawable: DRAWABLE + target_sbc: two CARD32s + ▶ + ust, msc, sbc: CARD64 +└─── + Errors: Window + + Blocks the client until the swap buffer count reaches target_sbc. If + the swap buffer count is already greater than or equal to target_sbc + when the request is recieved, this request will return immediately. + + If target_sbc is 0, this request will block the client until all + previous DRI2SwapBuffers requests have completed. + + Returns the current media stamp counter (MSC) and swap buffer count + (SBC) along with the unadjusted system time (UST) when the MSC was last + incremented. + + This request is only available with protocol version 1.2 or + later. + ⚙ ⚙ ⚙ ⚙ ⚙ ⚙ @@ -558,10 +636,6 @@ A.2 Protocol Requests 5n LISTofDRI2BUFFER buffers └─── -A.3 Protocol Events - -The DRI2 extension specifies no events. - ┌─── DRI2SwapBuffers 1 CARD8 major opcode @@ -583,6 +657,96 @@ The DRI2 extension specifies no events. 5n LISTofDRI2BUFFER buffers └─── +┌─── + DRI2SwapBuffers + 1 CARD8 major opcode + 1 7 DRI2 opcode + 2 8 length + 4 DRAWABLE drawable + 4 CARD32 target_msc_hi + 4 CARD32 target_msc_lo + 4 CARD32 divisor_hi + 4 CARD32 divisor_lo + 4 CARD32 remainder_hi + 4 CARD32 remainder_lo + ▶ + 1 1 Reply + 1 unused + 2 CARD16 sequence number + 4 0 reply length + 4 CARD32 swap_hi + 4 CARD32 swap_lo + 5n LISTofDRI2BUFFER buffers +└─── + +┌─── + DRI2GetMSC + 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 ust_hi + 4 CARD32 ust_lo + 4 CARD32 msc_hi + 4 CARD32 msc_lo + 4 CARD32 sbc_hi + 4 CARD32 sbc_lo +└─── + +┌─── + DRI2WaitMSC + 1 CARD8 major opcode + 1 7 DRI2 opcode + 2 8 length + 4 DRAWABLE drawable + 4 CARD32 target_msc_hi + 4 CARD32 target_msc_lo + 4 CARD32 divisor_hi + 4 CARD32 divisor_lo + 4 CARD32 remainder_hi + 4 CARD32 remainder_lo + ▶ + 1 1 Reply + 1 unused + 2 CARD16 sequence number + 4 0 reply length + 4 CARD32 ust_hi + 4 CARD32 ust_lo + 4 CARD32 msc_hi + 4 CARD32 msc_lo + 4 CARD32 sbc_hi + 4 CARD32 sbc_lo +└─── + +┌─── + DRI2WaitSBC + 1 CARD8 major opcode + 1 7 DRI2 opcode + 2 8 length + 4 DRAWABLE drawable + 4 CARD32 swap_hi + 4 CARD32 swap_lo + ▶ + 1 1 Reply + 1 unused + 2 CARD16 sequence number + 4 0 reply length + 4 CARD32 ust_hi + 4 CARD32 ust_lo + 4 CARD32 msc_hi + 4 CARD32 msc_lo + 4 CARD32 sbc_hi + 4 CARD32 sbc_lo +└─── + +A.3 Protocol Events + +The DRI2 extension specifies no events. A.4 Protocol Errors |