diff options
| author | Michel Dänzer <michel@daenzer.net> | 2006-09-28 14:07:12 +0000 |
|---|---|---|
| committer | Michel Dänzer <michel@daenzer.net> | 2006-09-28 14:07:12 +0000 |
| commit | c2f1a1857e553f4d11fc0715bb586f69ac147df0 (patch) | |
| tree | f5f5df3cba64993e27dba88a48c48021f8d7eb25 /src/mesa/drivers/dri/i915/intel_context.h | |
| parent | 7585fc989de1eabe7b978226b8750f912f06778c (diff) | |
i915: Attempt to schedule buffer swap on target vertical blank when possible.
This has some advantages over the traditional way of first waiting for the
target vertical blank and then emitting the buffer swap, e.g.
* glXSwapBuffers returns immediately, only the next time the driver needs the
hardware lock will it block until the target vertical blank. This should
allow applications that don't intermix rendering and other processing to
start processing for the next frame right away.
* It's less likely to produce tearing.
Diffstat (limited to 'src/mesa/drivers/dri/i915/intel_context.h')
| -rw-r--r-- | src/mesa/drivers/dri/i915/intel_context.h | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/src/mesa/drivers/dri/i915/intel_context.h b/src/mesa/drivers/dri/i915/intel_context.h index 0ca8ff268d..6cd6272053 100644 --- a/src/mesa/drivers/dri/i915/intel_context.h +++ b/src/mesa/drivers/dri/i915/intel_context.h @@ -261,6 +261,8 @@ struct intel_context GLuint swap_count; GLuint swap_missed_count; + + GLuint swap_scheduled; }; @@ -321,6 +323,13 @@ do { \ char __ret=0; \ DEBUG_CHECK_LOCK(); \ assert(!(intel)->locked); \ + if ((intel)->swap_scheduled) { \ + drmVBlank vbl; \ + vbl.request.type = DRM_VBLANK_ABSOLUTE; \ + vbl.request.sequence = (intel)->vbl_seq; \ + drmWaitVBlank((intel)->driFd, &vbl); \ + (intel)->swap_scheduled = 0; \ + } \ DRM_CAS((intel)->driHwLock, (intel)->hHWContext, \ (DRM_LOCK_HELD|(intel)->hHWContext), __ret); \ if (__ret) \ |