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i965/vec4: Port Gen8 SET_VERTEX_COUNT handling to vec4_generator.

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Broadwell requires the number of vertices written by the geometry shader
to be specified in a separate register, as part of the terminating
message's payload.

This also means GS_OPCODE_THREAD_END needs to increment mlen.

Signed-off-by: Kenneth Graunke <kenneth@whitecape.org>
Reviewed-by: Chris Forbes <chrisf@ijw.co.nz>
Reviewed-by: Matt Turner <mattst88@gmail.com>
This commit is contained in:
Kenneth Graunke
2014-08-11 15:53:54 -07:00
parent 17c17b87f9
commit 849046b842
1 changed files with 25 additions and 18 deletions
Download Patch File Download Diff File Expand all files Collapse all files
src/mesa/drivers/dri/i965/brw_vec4_generator.cpp
+25 -18
View File
@@ -437,7 +437,7 @@ vec4_generator::generate_gs_thread_end(vec4_instruction *inst)
inst->base_mrf, /* starting mrf reg nr */
src,
BRW_URB_WRITE_EOT,
1, /* message len */
brw->gen >= 8 ? 2 : 1,/* message len */
0, /* response len */
0, /* urb destination offset */
BRW_URB_SWIZZLE_INTERLEAVE);
@@ -480,25 +480,32 @@ vec4_generator::generate_gs_set_vertex_count(struct brw_reg dst,
struct brw_reg src)
{
brw_push_insn_state(p);
brw_set_default_access_mode(p, BRW_ALIGN_1);
brw_set_default_mask_control(p, BRW_MASK_DISABLE);
/* If we think of the src and dst registers as composed of 8 DWORDs each,
* we want to pick up the contents of DWORDs 0 and 4 from src, truncate
* them to WORDs, and then pack them into DWORD 2 of dst.
*
* It's easier to get the EU to do this if we think of the src and dst
* registers as composed of 16 WORDS each; then, we want to pick up the
* contents of WORDs 0 and 8 from src, and pack them into WORDs 4 and 5 of
* dst.
*
* We can do that by the following EU instruction:
*
* mov (2) dst.4<1>:uw src<8;1,0>:uw { Align1, Q1, NoMask }
*/
brw_MOV(p, suboffset(stride(retype(dst, BRW_REGISTER_TYPE_UW), 2, 2, 1), 4),
stride(retype(src, BRW_REGISTER_TYPE_UW), 8, 1, 0));
brw_set_default_access_mode(p, BRW_ALIGN_16);
if (brw->gen >= 8) {
/* Move the vertex count into the second MRF for the EOT write. */
brw_MOV(p, retype(brw_message_reg(dst.nr + 1), BRW_REGISTER_TYPE_UD),
src);
} else {
/* If we think of the src and dst registers as composed of 8 DWORDs each,
* we want to pick up the contents of DWORDs 0 and 4 from src, truncate
* them to WORDs, and then pack them into DWORD 2 of dst.
*
* It's easier to get the EU to do this if we think of the src and dst
* registers as composed of 16 WORDS each; then, we want to pick up the
* contents of WORDs 0 and 8 from src, and pack them into WORDs 4 and 5
* of dst.
*
* We can do that by the following EU instruction:
*
* mov (2) dst.4<1>:uw src<8;1,0>:uw { Align1, Q1, NoMask }
*/
brw_set_default_access_mode(p, BRW_ALIGN_1);
brw_MOV(p,
suboffset(stride(retype(dst, BRW_REGISTER_TYPE_UW), 2, 2, 1), 4),
stride(retype(src, BRW_REGISTER_TYPE_UW), 8, 1, 0));
brw_set_default_access_mode(p, BRW_ALIGN_16);
}
brw_pop_insn_state(p);
}