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i965/gen7: Add the ability to send URB_WRITE_OWORD messages. 

Previously, brw_urb_WRITE() would always generate a URB_WRITE_HWORD
message, we always wanted to write data to the URB in pairs of varying
slots or larger (an HWORD is 32 bytes, which is 2 varying slots).

In order to support geometry shader EndPrimitive functionality, we'll
need the ability to write to just a single OWORD (16 byte) slot, since
we'll only be outputting 32 of the control data bits at a time.  So
this patch adds a flag that will cause brw_urb_WRITE to generate a
URB_WRITE_OWORD message.

Reviewed-by: Ian Romanick <ian.d.romanick@intel.com>
Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>
This commit is contained in:
Paul Berry 2013-08-11 20:29:34 -07:00
parent bf5419e389
commit a74af8148d
3 changed files with 16 additions and 2 deletions
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3
src/mesa/drivers/dri/i965/brw_defines.h
View File

@ -1172,7 +1172,8 @@ enum brw_message_target {
#define BRW_MATH_DATA_VECTOR 0
#define BRW_MATH_DATA_SCALAR 1
#define BRW_URB_OPCODE_WRITE 0
#define BRW_URB_OPCODE_WRITE_HWORD 0
#define BRW_URB_OPCODE_WRITE_OWORD 1
#define BRW_URB_SWIZZLE_NONE 0
#define BRW_URB_SWIZZLE_INTERLEAVE 1

8
src/mesa/drivers/dri/i965/brw_eu.h
View File

@ -263,6 +263,14 @@ enum brw_urb_write_flags {
*/
BRW_URB_WRITE_USE_CHANNEL_MASKS = 0x20,
/**
* Indicates that the data should be sent to the URB using the
* URB_WRITE_OWORD message rather than URB_WRITE_HWORD (gen == 7). This
* causes offsets to be interpreted as multiples of an OWORD instead of an
* HWORD, and only allows one OWORD to be written.
*/
BRW_URB_WRITE_OWORD = 0x40,
/**
* Convenient combination of flags: end the thread while simultaneously
* marking the given URB entry as complete.

7
src/mesa/drivers/dri/i965/brw_eu_emit.c
View File

@ -529,7 +529,12 @@ static void brw_set_urb_message( struct brw_compile *p,
msg_length, response_length, true,
flags & BRW_URB_WRITE_EOT);
if (brw->gen == 7) {
insn->bits3.urb_gen7.opcode = 0; /* URB_WRITE_HWORD */
if (flags & BRW_URB_WRITE_OWORD) {
assert(msg_length == 2); /* header + one OWORD of data */
insn->bits3.urb_gen7.opcode = BRW_URB_OPCODE_WRITE_OWORD;
} else {
insn->bits3.urb_gen7.opcode = BRW_URB_OPCODE_WRITE_HWORD;
}
insn->bits3.urb_gen7.offset = offset;
assert(swizzle_control != BRW_URB_SWIZZLE_TRANSPOSE);
insn->bits3.urb_gen7.swizzle_control = swizzle_control;