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i965/gen6: Align interleaved URB writes for overflow outputs as well.

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Fixes glsl-max-varyings.

Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=35614
Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>
This commit is contained in:
Eric Anholt
2011-04-29 15:59:30 -07:00
parent eb0a9e9a5a
commit 484b51d484
1 changed files with 27 additions and 8 deletions
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35
src/mesa/drivers/dri/i965/brw_vs_emit.c
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@@ -1553,6 +1553,26 @@ static void emit_swz( struct brw_vs_compile *c,
}
}
static int
align_interleaved_urb_mlen(struct brw_context *brw, int mlen)
{
struct intel_context *intel = &brw->intel;
if (intel->gen >= 6) {
/* URB data written (does not include the message header reg) must
* be a multiple of 256 bits, or 2 VS registers. See vol5c.5,
* section 5.4.3.2.2: URB_INTERLEAVED.
*
* URB entries are allocated on a multiple of 1024 bits, so an
* extra 128 bits written here to make the end align to 256 is
* no problem.
*/
if ((mlen % 2) != 1)
mlen++;
}
return mlen;
}
/**
* Post-vertex-program processing. Send the results to the URB.
@@ -1734,12 +1754,11 @@ static void emit_vertex_write( struct brw_vs_compile *c)
eot = (c->first_overflow_output == 0);
msg_len = c->nr_outputs + 2 + len_vertex_header;
if (intel->gen >= 6) {
/* interleaved urb write message length for gen6 should be multiple of 2 */
if ((msg_len % 2) != 0)
msg_len++;
}
/* Message header, plus VUE header, plus the (first set of) outputs. */
msg_len = 1 + len_vertex_header + c->nr_outputs;
msg_len = align_interleaved_urb_mlen(brw, msg_len);
/* Any outputs beyond BRW_MAX_MRF should be past first_overflow_output */
msg_len = MIN2(msg_len, (BRW_MAX_MRF - 1)),
brw_urb_WRITE(p,
brw_null_reg(), /* dest */
@@ -1747,7 +1766,7 @@ static void emit_vertex_write( struct brw_vs_compile *c)
c->r0, /* src */
0, /* allocate */
1, /* used */
MIN2(msg_len - 1, (BRW_MAX_MRF - 1)), /* msg len */
msg_len,
0, /* response len */
eot, /* eot */
eot, /* writes complete */
@@ -1774,7 +1793,7 @@ static void emit_vertex_write( struct brw_vs_compile *c)
c->r0, /* src */
0, /* allocate */
1, /* used */
mrf, /* msg len */
align_interleaved_urb_mlen(brw, mrf),
0, /* response len */
1, /* eot */
1, /* writes complete */