diff options
| author | Chris Wilson <chris@chris-wilson.co.uk> | 2011-02-10 20:25:51 +0000 |
|---|---|---|
| committer | Chris Wilson <chris@chris-wilson.co.uk> | 2011-02-21 12:59:35 +0000 |
| commit | 8d68a90e225d831a395ba788e425cb717eec1f9a (patch) | |
| tree | 1c46eb19125ebbb205625783dd184e0489231d01 /src/mesa/drivers/dri/i965/brw_draw_upload.c | |
| parent | 3f55683927278e57f3ef8a151d15f4cffdc060dc (diff) | |
intel: use pwrite for batch
It's faster. Not only is the memcpy more efficiently performed in the
kernel (making up for the system call overhead), but by not using mmap
we remove the greater overhead of tracking the vma of every batch.
And it means we can read back from the batch buffer without incurring
the cost of a uncached read through the GTT.
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Diffstat (limited to 'src/mesa/drivers/dri/i965/brw_draw_upload.c')
| -rw-r--r-- | src/mesa/drivers/dri/i965/brw_draw_upload.c | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/src/mesa/drivers/dri/i965/brw_draw_upload.c b/src/mesa/drivers/dri/i965/brw_draw_upload.c index fb31b2c2d4..c257b9c517 100644 --- a/src/mesa/drivers/dri/i965/brw_draw_upload.c +++ b/src/mesa/drivers/dri/i965/brw_draw_upload.c @@ -25,6 +25,7 @@ * **************************************************************************/ +#undef NDEBUG #include "main/glheader.h" #include "main/bufferobj.h" @@ -298,6 +299,9 @@ static void brw_prepare_vertices(struct brw_context *brw) brw->vb.enabled[brw->vb.nr_enabled++] = input; } + if (brw->vb.nr_enabled == 0) + return; + /* XXX: In the rare cases where this happens we fallback all * the way to software rasterization, although a tnl fallback * would be sufficient. I don't know of *any* real world @@ -481,6 +485,7 @@ static void brw_emit_vertices(struct brw_context *brw) } ADVANCE_BATCH(); + BEGIN_BATCH(1 + brw->vb.nr_enabled * 2); OUT_BATCH((CMD_VERTEX_ELEMENT << 16) | ((1 + brw->vb.nr_enabled * 2) - 2)); for (i = 0; i < brw->vb.nr_enabled; i++) { |