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i965: Reserve space for "Vertex Count" in GS outputs.

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v2: Also increment ir->offset in the GS visitor, rather than at the
    final assembly generation stage (requested by Paul).

Signed-off-by: Kenneth Graunke <kenneth@whitecape.org>
Reviewed-by: Paul Berry <stereotype441@gmail.com>
This commit is contained in:
Kenneth Graunke 2013-11-05 16:55:06 -08:00
parent 94c0a11b19
commit ad04e396fa
2 changed files with 13 additions and 0 deletions
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6
src/mesa/drivers/dri/i965/brw_vec4_gs.c
View file

@ -194,6 +194,12 @@ do_gs_prog(struct brw_context *brw,
c.prog_data.output_vertex_size_hwords * 32 * gp->program.VerticesOut;
output_size_bytes += 32 * c.prog_data.control_data_header_size_hwords;
/* Broadwell stores "Vertex Count" as a full 8 DWord (32 byte) URB output,
* which comes before the control header.
*/
if (brw->gen >= 8)
output_size_bytes += 32;
assert(output_size_bytes >= 1);
if (output_size_bytes > GEN7_MAX_GS_URB_ENTRY_SIZE_BYTES)
return false;

7
src/mesa/drivers/dri/i965/brw_vec4_gs_visitor.cpp
View file

@ -267,6 +267,13 @@ vec4_gs_visitor::emit_urb_write_opcode(bool complete)
vec4_instruction *inst = emit(GS_OPCODE_URB_WRITE);
inst->offset = c->prog_data.control_data_header_size_hwords;
/* We need to increment Global Offset by 1 to make room for Broadwell's
* extra "Vertex Count" payload at the beginning of the URB entry.
*/
if (brw->gen >= 8)
inst->offset++;
inst->urb_write_flags = BRW_URB_WRITE_PER_SLOT_OFFSET;
return inst;
}