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i965/gen6/gs: implement GS_OPCODE_SVB_WRITE opcode

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This opcode will be used when sending SVB WRITE messages to save
transform feedback outputs into Streamed Vertex Buffers.

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 2014-07-18 10:36:10 +02:00 • committed by Iago Toral Quiroga
parent 66ec61c49f
commit e86ae1b0a3
4 changed files with 63 additions and 0 deletions
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12
src/mesa/drivers/dri/i965/brw_defines.h
View file

@ -1043,6 +1043,18 @@ enum opcode {
* - dst is the GRF where PrimitiveID information will be moved.
*/
GS_OPCODE_SET_PRIMITIVE_ID,
/**
* Write transform feedback data to the SVB by sending a SVB WRITE message.
* Used in gen6.
*
* - dst is the MRF register containing the message header.
*
* - src0 is the register where the vertex data is going to be copied from.
*
* - src1 is the destination register when write commit occurs.
*/
GS_OPCODE_SVB_WRITE,
};
enum brw_derivative_quality {

2
src/mesa/drivers/dri/i965/brw_shader.cpp
View file

@ -528,6 +528,8 @@ brw_instruction_name(enum opcode op)
return "ff_sync";
case GS_OPCODE_SET_PRIMITIVE_ID:
return "set_primitive_id";
case GS_OPCODE_SVB_WRITE:
return "gs_svb_write";
default:
/* Yes, this leaks. It's in debug code, it should never occur, and if

7
src/mesa/drivers/dri/i965/brw_vec4.h
View file

@ -220,6 +220,9 @@ public:
enum brw_urb_write_flags urb_write_flags;
bool header_present;
unsigned sol_binding; /**< gen6: SOL binding table index */
bool sol_final_write; /**< gen6: send commit message */
bool is_send_from_grf();
bool can_reswizzle(int dst_writemask, int swizzle, int swizzle_mask);
void reswizzle(int dst_writemask, int swizzle);
@ -654,6 +657,10 @@ private:
struct brw_reg src1);
void generate_gs_set_vertex_count(struct brw_reg dst,
struct brw_reg src);
void generate_gs_svb_write(vec4_instruction *inst,
struct brw_reg dst,
struct brw_reg src0,
struct brw_reg src1);
void generate_gs_set_dword_2(struct brw_reg dst, struct brw_reg src);
void generate_gs_prepare_channel_masks(struct brw_reg dst);
void generate_gs_set_channel_masks(struct brw_reg dst, struct brw_reg src);

42
src/mesa/drivers/dri/i965/brw_vec4_generator.cpp
View file

@ -573,6 +573,44 @@ vec4_generator::generate_gs_set_vertex_count(struct brw_reg dst,
brw_pop_insn_state(p);
}
void
vec4_generator::generate_gs_svb_write(vec4_instruction *inst,
struct brw_reg dst,
struct brw_reg src0,
struct brw_reg src1)
{
int binding = inst->sol_binding;
bool final_write = inst->sol_final_write;
brw_push_insn_state(p);
/* Copy Vertex data into M0.x */
brw_MOV(p, stride(dst, 4, 4, 1),
stride(retype(src0, BRW_REGISTER_TYPE_UD), 4, 4, 1));
/* Send SVB Write */
brw_svb_write(p,
final_write ? src1 : brw_null_reg(), /* dest == src1 */
1, /* msg_reg_nr */
dst, /* src0 == previous dst */
SURF_INDEX_GEN6_SOL_BINDING(binding), /* binding_table_index */
final_write); /* send_commit_msg */
/* Finally, wait for the write commit to occur so that we can proceed to
* other things safely.
*
* From the Sandybridge PRM, Volume 4, Part 1, Section 3.3:
*
* The write commit does not modify the destination register, but
* merely clears the dependency associated with the destination
* register. Thus, a simple “mov” instruction using the register as a
* source is sufficient to wait for the write commit to occur.
*/
if (final_write) {
brw_MOV(p, src1, src1);
}
brw_pop_insn_state(p);
}
void
vec4_generator::generate_gs_set_dword_2(struct brw_reg dst, struct brw_reg src)
{
@ -1347,6 +1385,10 @@ vec4_generator::generate_code(const cfg_t *cfg)
generate_gs_urb_write_allocate(inst);
break;
case GS_OPCODE_SVB_WRITE:
generate_gs_svb_write(inst, dst, src[0], src[1]);
break;
case GS_OPCODE_THREAD_END:
generate_gs_thread_end(inst);
break;