Mesa (master): i965: Add support for gen6 FB writes to the new FS.

[Eric Anholt]

Module: Mesa
Branch: master
Commit: ea909be58dda7e916cb9ce434ecb78597881ad33
URL:    http://cgit.freedesktop.org/mesa/mesa/commit/?id=ea909be58dda7e916cb9ce434ecb78597881ad33

Author: Eric Anholt <eric at anholt.net>
Date:   Mon Oct  4 15:07:17 2010 -0700

i965: Add support for gen6 FB writes to the new FS.

This uses message headers for now, since we'll need it for MRT.  We
can cut out the header later.

---

 src/mesa/drivers/dri/i965/brw_eu_emit.c |   11 +++++++++--
 src/mesa/drivers/dri/i965/brw_fs.cpp    |   14 +++++++++++++-
 2 files changed, 22 insertions(+), 3 deletions(-)

diff --git a/src/mesa/drivers/dri/i965/brw_eu_emit.c b/src/mesa/drivers/dri/i965/brw_eu_emit.c
index 09cc8b2..5954135 100644
--- a/src/mesa/drivers/dri/i965/brw_eu_emit.c
+++ b/src/mesa/drivers/dri/i965/brw_eu_emit.c
@@ -448,6 +448,7 @@ static void brw_set_dp_write_message( struct brw_context *brw,
 				      GLuint msg_control,
 				      GLuint msg_type,
 				      GLuint msg_length,
+				      GLboolean header_present,
 				      GLuint pixel_scoreboard_clear,
 				      GLuint response_length,
 				      GLuint end_of_thread,
@@ -462,7 +463,7 @@ static void brw_set_dp_write_message( struct brw_context *brw,
        insn->bits3.dp_render_cache.pixel_scoreboard_clear = pixel_scoreboard_clear;
        insn->bits3.dp_render_cache.msg_type = msg_type;
        insn->bits3.dp_render_cache.send_commit_msg = send_commit_msg;
-       insn->bits3.dp_render_cache.header_present = 0; /* XXX */
+       insn->bits3.dp_render_cache.header_present = header_present;
        insn->bits3.dp_render_cache.response_length = response_length;
        insn->bits3.dp_render_cache.msg_length = msg_length;
        insn->bits3.dp_render_cache.end_of_thread = end_of_thread;
@@ -476,7 +477,7 @@ static void brw_set_dp_write_message( struct brw_context *brw,
        insn->bits3.dp_write_gen5.pixel_scoreboard_clear = pixel_scoreboard_clear;
        insn->bits3.dp_write_gen5.msg_type = msg_type;
        insn->bits3.dp_write_gen5.send_commit_msg = send_commit_msg;
-       insn->bits3.dp_write_gen5.header_present = 1;
+       insn->bits3.dp_write_gen5.header_present = header_present;
        insn->bits3.dp_write_gen5.response_length = response_length;
        insn->bits3.dp_write_gen5.msg_length = msg_length;
        insn->bits3.dp_write_gen5.end_of_thread = end_of_thread;
@@ -1293,6 +1294,7 @@ void brw_dp_WRITE_16( struct brw_compile *p,
 			       BRW_DATAPORT_OWORD_BLOCK_4_OWORDS, /* msg_control */
 			       BRW_DATAPORT_WRITE_MESSAGE_OWORD_BLOCK_WRITE, /* msg_type */
 			       msg_length,
+			       GL_TRUE, /* header_present */
 			       0, /* pixel scoreboard */
 			       send_commit_msg, /* response_length */
 			       0, /* eot */
@@ -1530,12 +1532,16 @@ void brw_fb_WRITE(struct brw_compile *p,
    struct intel_context *intel = &p->brw->intel;
    struct brw_instruction *insn;
    GLuint msg_control, msg_type;
+   GLboolean header_present = GL_TRUE;
 
    insn = next_insn(p, BRW_OPCODE_SEND);
    insn->header.predicate_control = 0; /* XXX */
    insn->header.compression_control = BRW_COMPRESSION_NONE;
 
    if (intel->gen >= 6) {
+      if (msg_length == 4)
+	 header_present = GL_FALSE;
+
        /* headerless version, just submit color payload */
        src0 = brw_message_reg(msg_reg_nr);
 
@@ -1559,6 +1565,7 @@ void brw_fb_WRITE(struct brw_compile *p,
 			    msg_control,
 			    msg_type,
 			    msg_length,
+			    header_present,
 			    1,	/* pixel scoreboard */
 			    response_length,
 			    eot,
diff --git a/src/mesa/drivers/dri/i965/brw_fs.cpp b/src/mesa/drivers/dri/i965/brw_fs.cpp
index 5eaa998..f42c469 100644
--- a/src/mesa/drivers/dri/i965/brw_fs.cpp
+++ b/src/mesa/drivers/dri/i965/brw_fs.cpp
@@ -1920,6 +1920,7 @@ void
 fs_visitor::generate_fb_write(fs_inst *inst)
 {
    GLboolean eot = inst->eot;
+   struct brw_reg implied_header;
 
    /* Header is 2 regs, g0 and g1 are the contents. g0 will be implied
     * move, here's g1.
@@ -1927,16 +1928,27 @@ fs_visitor::generate_fb_write(fs_inst *inst)
    brw_push_insn_state(p);
    brw_set_mask_control(p, BRW_MASK_DISABLE);
    brw_set_compression_control(p, BRW_COMPRESSION_NONE);
+
+   if (intel->gen >= 6) {
+      brw_MOV(p,
+	      brw_message_reg(0),
+	      brw_vec8_grf(0, 0));
+      implied_header = brw_null_reg();
+   } else {
+      implied_header = retype(brw_vec8_grf(0, 0), BRW_REGISTER_TYPE_UW);
+   }
+
    brw_MOV(p,
 	   brw_message_reg(1),
 	   brw_vec8_grf(1, 0));
+
    brw_pop_insn_state(p);
 
    brw_fb_WRITE(p,
 		8, /* dispatch_width */
 		retype(vec8(brw_null_reg()), BRW_REGISTER_TYPE_UW),
 		0, /* base MRF */
-		retype(brw_vec8_grf(0, 0), BRW_REGISTER_TYPE_UW),
+		implied_header,
 		inst->target,
 		inst->mlen,
 		0,