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authorBrian Paul <brianp@vmware.com>2009-03-31 10:49:41 -0600
committerBrian Paul <brianp@vmware.com>2009-04-03 09:07:03 -0600
commit6b18a8d3e7114a1af931a2fc20a1e23cb2d7789c (patch)
treed436f2bfb017f609758a5e9dd5b700551525bd42 /src
parent264058f38af00519e9f180f237a771566117cd8b (diff)
i965: new and updated comments
Diffstat (limited to 'src')
-rw-r--r--src/mesa/drivers/dri/i965/brw_eu_emit.c46
1 files changed, 29 insertions, 17 deletions
diff --git a/src/mesa/drivers/dri/i965/brw_eu_emit.c b/src/mesa/drivers/dri/i965/brw_eu_emit.c
index 4becdf069f..03e4cdde33 100644
--- a/src/mesa/drivers/dri/i965/brw_eu_emit.c
+++ b/src/mesa/drivers/dri/i965/brw_eu_emit.c
@@ -320,14 +320,15 @@ static void brw_set_dp_read_message( struct brw_instruction *insn,
{
brw_set_src1(insn, brw_imm_d(0));
- insn->bits3.dp_read.binding_table_index = binding_table_index;
- insn->bits3.dp_read.msg_control = msg_control;
- insn->bits3.dp_read.msg_type = msg_type;
- insn->bits3.dp_read.target_cache = target_cache;
- insn->bits3.dp_read.response_length = response_length;
- insn->bits3.dp_read.msg_length = msg_length;
- insn->bits3.dp_read.msg_target = BRW_MESSAGE_TARGET_DATAPORT_READ;
- insn->bits3.dp_read.end_of_thread = end_of_thread;
+ insn->bits3.dp_read.binding_table_index = binding_table_index; /*0:7*/
+ insn->bits3.dp_read.msg_control = msg_control; /*8:11*/
+ insn->bits3.dp_read.msg_type = msg_type; /*12:13*/
+ insn->bits3.dp_read.target_cache = target_cache; /*14:15*/
+ insn->bits3.dp_read.response_length = response_length; /*16:19*/
+ insn->bits3.dp_read.msg_length = msg_length; /*20:23*/
+ insn->bits3.dp_read.msg_target = BRW_MESSAGE_TARGET_DATAPORT_READ; /*24:27*/
+ insn->bits3.dp_read.pad1 = 0; /*28:30*/
+ insn->bits3.dp_read.end_of_thread = end_of_thread; /*31*/
}
static void brw_set_sampler_message(struct brw_context *brw,
@@ -770,7 +771,7 @@ void brw_CMP(struct brw_compile *p,
* Helpers for the various SEND message types:
*/
-/* Invert 8 values
+/** Extended math function, float[8].
*/
void brw_math( struct brw_compile *p,
struct brw_reg dest,
@@ -802,7 +803,9 @@ void brw_math( struct brw_compile *p,
data_type);
}
-/* Use 2 send instructions to invert 16 elements
+/**
+ * Extended math function, float[16].
+ * Use 2 send instructions.
*/
void brw_math_16( struct brw_compile *p,
struct brw_reg dest,
@@ -855,8 +858,11 @@ void brw_math_16( struct brw_compile *p,
}
-
-
+/**
+ * Write block of 16 dwords/floats to the data port Render Cache scratch buffer.
+ * Scratch offset should be a multiple of 64.
+ * Used for register spilling.
+ */
void brw_dp_WRITE_16( struct brw_compile *p,
struct brw_reg src,
GLuint msg_reg_nr,
@@ -867,6 +873,7 @@ void brw_dp_WRITE_16( struct brw_compile *p,
brw_set_mask_control(p, BRW_MASK_DISABLE);
brw_set_compression_control(p, BRW_COMPRESSION_NONE);
+ /* set message header global offset field (reg 0, element 2) */
brw_MOV(p,
retype(brw_vec1_grf(0, 2), BRW_REGISTER_TYPE_D),
brw_imm_d(scratch_offset));
@@ -887,7 +894,7 @@ void brw_dp_WRITE_16( struct brw_compile *p,
brw_set_src0(insn, src);
brw_set_dp_write_message(insn,
- 255, /* bti */
+ 255, /* binding table index (255=stateless) */
BRW_DATAPORT_OWORD_BLOCK_4_OWORDS, /* msg_control */
BRW_DATAPORT_WRITE_MESSAGE_OWORD_BLOCK_WRITE, /* msg_type */
msg_length,
@@ -895,10 +902,14 @@ void brw_dp_WRITE_16( struct brw_compile *p,
0, /* response_length */
0); /* eot */
}
-
}
+/**
+ * Read block of 16 dwords/floats from the data port Render Cache scratch buffer.
+ * Scratch offset should be a multiple of 64.
+ * Used for register spilling.
+ */
void brw_dp_READ_16( struct brw_compile *p,
struct brw_reg dest,
GLuint msg_reg_nr,
@@ -909,6 +920,7 @@ void brw_dp_READ_16( struct brw_compile *p,
brw_set_compression_control(p, BRW_COMPRESSION_NONE);
brw_set_mask_control(p, BRW_MASK_DISABLE);
+ /* set message header global offset field (reg 0, element 2) */
brw_MOV(p,
retype(brw_vec1_grf(0, 2), BRW_REGISTER_TYPE_D),
brw_imm_d(scratch_offset));
@@ -927,10 +939,10 @@ void brw_dp_READ_16( struct brw_compile *p,
brw_set_src0(insn, retype(brw_vec8_grf(0, 0), BRW_REGISTER_TYPE_UW));
brw_set_dp_read_message(insn,
- 255, /* bti */
- 3, /* msg_control */
+ 255, /* binding table index (255=stateless) */
+ 3, /* msg_control (3 means 4 Owords) */
BRW_DATAPORT_READ_MESSAGE_OWORD_BLOCK_READ, /* msg_type */
- 1, /* target cache */
+ 1, /* target cache (render/scratch) */
1, /* msg_length */
2, /* response_length */
0); /* eot */