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i965/gen6/gs: Add an additional parameter to the FF_SYNC opcode.

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We will use this parameter in later patches to provide information relevant
to transform feedback that needs to be set as part of the FF_SYNC message.

Signed-off-by: Samuel Iglesias Gonsalvez <siglesias@igalia.com>
Acked-by: Kenneth Graunke <kenneth@whitecape.org>
Reviewed-by: Jordan Justen <jordan.l.justen@intel.com>
This commit is contained in:
Samuel Iglesias Gonsalvez 2014-07-23 10:51:35 +02:00 • committed by Iago Toral Quiroga
parent 3ea410972a
commit 1f77bfce7d
4 changed files with 19 additions and 8 deletions
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4
src/mesa/drivers/dri/i965/brw_defines.h
View file

@ -1028,6 +1028,10 @@ enum opcode {
*
* - src0 is the number of primitives written.
*
* - src1 is the value to hold in M0.0: number of SO vertices to write
* and number of SO primitives needed. Its value will be overwritten
* with the SVBI values if transform feedback is enabled.
*
* Note: This opcode uses an implicit MRF register for the ff_sync message
* header, so the caller is expected to set inst->base_mrf and initialize
* that MRF register to r0. This opcode will also write to this MRF register

3
src/mesa/drivers/dri/i965/brw_vec4.h
View file

@ -675,7 +675,8 @@ private:
struct brw_reg src2);
void generate_gs_ff_sync(vec4_instruction *inst,
struct brw_reg dst,
struct brw_reg src0);
struct brw_reg src0,
struct brw_reg src1);
void generate_gs_set_primitive_id(struct brw_reg dst);
void generate_oword_dual_block_offsets(struct brw_reg m1,
struct brw_reg index);

17
src/mesa/drivers/dri/i965/brw_vec4_generator.cpp
View file

@ -756,7 +756,8 @@ vec4_generator::generate_gs_ff_sync_set_primitives(struct brw_reg dst,
void
vec4_generator::generate_gs_ff_sync(vec4_instruction *inst,
struct brw_reg dst,
struct brw_reg src0)
struct brw_reg src0,
struct brw_reg src1)
{
/* This opcode uses an implied MRF register for:
* - the header of the ff_sync message. And as such it is expected to be
@ -766,14 +767,13 @@ vec4_generator::generate_gs_ff_sync(vec4_instruction *inst,
struct brw_reg header =
retype(brw_message_reg(inst->base_mrf), BRW_REGISTER_TYPE_UD);
/* Overwrite dword 0 of the header (cleared for now since we are not doing
* transform feedback) and dword 1 (to hold the number of primitives
* written).
/* Overwrite dword 0 of the header (SO vertices to write) and
* dword 1 (number of primitives written).
*/
brw_push_insn_state(p);
brw_set_default_mask_control(p, BRW_MASK_DISABLE);
brw_set_default_access_mode(p, BRW_ALIGN_1);
brw_MOV(p, get_element_ud(header, 0), brw_imm_ud(0));
brw_MOV(p, get_element_ud(header, 0), get_element_ud(src1, 0));
brw_MOV(p, get_element_ud(header, 1), get_element_ud(src0, 0));
brw_pop_insn_state(p);
@ -791,6 +791,11 @@ vec4_generator::generate_gs_ff_sync(vec4_instruction *inst,
brw_set_default_access_mode(p, BRW_ALIGN_1);
brw_set_default_mask_control(p, BRW_MASK_DISABLE);
brw_MOV(p, get_element_ud(header, 0), get_element_ud(dst, 0));
/* src1 is not an immediate when we use transform feedback */
if (src1.file != BRW_IMMEDIATE_VALUE)
brw_MOV(p, brw_vec4_grf(src1.nr, 0), brw_vec4_grf(dst.nr, 1));
brw_pop_insn_state(p);
}
@ -1441,7 +1446,7 @@ vec4_generator::generate_code(const cfg_t *cfg)
break;
case GS_OPCODE_FF_SYNC:
generate_gs_ff_sync(inst, dst, src[0]);
generate_gs_ff_sync(inst, dst, src[0], src[1]);
break;
case GS_OPCODE_FF_SYNC_SET_PRIMITIVES:

3
src/mesa/drivers/dri/i965/gen6_gs_visitor.cpp
View file

@ -331,7 +331,8 @@ gen6_gs_visitor::emit_thread_end()
{
this->current_annotation = "gen6 thread end: ff_sync";
vec4_instruction *inst =
emit(GS_OPCODE_FF_SYNC, dst_reg(this->temp), this->prim_count);
emit(GS_OPCODE_FF_SYNC, dst_reg(this->temp), this->prim_count,
brw_imm_ud(0u));
inst->base_mrf = base_mrf;
/* Loop over all buffered vertices and emit URB write messages */