fdo-mirrors/mesa
1
0
Fork 0
mirror of https://gitlab.freedesktop.org/mesa/mesa.git synced 2026-05-05 22:38:05 +02:00
Code Issues Projects Releases Packages Wiki Activity Actions 1

i965/vec4: Generate URB writes using a loop.

Browse source 
Previously we only ever did 1 or 2 URB writes, since the maximum
number of varyings we support is small enough to fit in 2 URB writes.
But GL 3.2 requires the geometry shader to support 128 output varying
components, and this could require up to 3 URB writes.

Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>
This commit is contained in:
Paul Berry 2013-09-03 12:30:06 -07:00
parent 875972029e
commit 784044c206
1 changed files with 21 additions and 31 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

52
src/mesa/drivers/dri/i965/brw_vec4_visitor.cpp
View file

@ -2694,47 +2694,37 @@ vec4_visitor::emit_vertex()
emit_clip_distances(output_reg[VARYING_SLOT_CLIP_DIST1], 4);
}
/* Set up the VUE data for the first URB write */
int slot;
for (slot = 0; slot < prog_data->vue_map.num_slots; ++slot) {
emit_urb_slot(mrf++, prog_data->vue_map.slot_to_varying[slot]);
/* If this was max_usable_mrf, we can't fit anything more into this URB
* WRITE.
/* We may need to split this up into several URB writes, so do them in a
* loop.
*/
int slot = 0;
bool complete = false;
do {
/* URB offset is in URB row increments, and each of our MRFs is half of
* one of those, since we're doing interleaved writes.
*/
if (mrf > max_usable_mrf) {
slot++;
break;
}
}
int offset = slot / 2;
bool complete = slot >= prog_data->vue_map.num_slots;
current_annotation = "URB write";
vec4_instruction *inst = emit_urb_write_opcode(complete);
inst->base_mrf = base_mrf;
inst->mlen = align_interleaved_urb_mlen(brw, mrf - base_mrf);
/* Optional second URB write */
if (!complete) {
mrf = base_mrf + 1;
for (; slot < prog_data->vue_map.num_slots; ++slot) {
assert(mrf < max_usable_mrf);
emit_urb_slot(mrf++, prog_data->vue_map.slot_to_varying[slot]);
/* If this was max_usable_mrf, we can't fit anything more into this
* URB WRITE.
*/
if (mrf > max_usable_mrf) {
slot++;
break;
}
}
complete = slot >= prog_data->vue_map.num_slots;
current_annotation = "URB write";
inst = emit_urb_write_opcode(true /* complete */);
vec4_instruction *inst = emit_urb_write_opcode(complete);
inst->base_mrf = base_mrf;
inst->mlen = align_interleaved_urb_mlen(brw, mrf - base_mrf);
/* URB destination offset. In the previous write, we got MRFs
* 2-13 minus the one header MRF, so 12 regs. URB offset is in
* URB row increments, and each of our MRFs is half of one of
* those, since we're doing interleaved writes.
*/
inst->offset += (max_usable_mrf - base_mrf) / 2;
}
inst->offset += offset;
} while(!complete);
}