Mesa (master): i965: Fix up 16-wide gen6 FB writes after various refactoring.

[Eric Anholt]

Module: Mesa
Branch: master
Commit: d1ead22d1bc2931e46410cd7367e48656135d63c
URL:    http://cgit.freedesktop.org/mesa/mesa/commit/?id=d1ead22d1bc2931e46410cd7367e48656135d63c

Author: Eric Anholt <eric at anholt.net>
Date:   Fri Dec  3 12:20:02 2010 -0800

i965: Fix up 16-wide gen6 FB writes after various refactoring.

---

 src/mesa/drivers/dri/i965/brw_wm_emit.c |   17 ++++++++---------
 1 files changed, 8 insertions(+), 9 deletions(-)

diff --git a/src/mesa/drivers/dri/i965/brw_wm_emit.c b/src/mesa/drivers/dri/i965/brw_wm_emit.c
index 8b255b1..6e8f08c 100644
--- a/src/mesa/drivers/dri/i965/brw_wm_emit.c
+++ b/src/mesa/drivers/dri/i965/brw_wm_emit.c
@@ -1416,7 +1416,6 @@ void emit_fb_write(struct brw_wm_compile *c,
    struct intel_context *intel = &brw->intel;
    GLuint nr = 2;
    GLuint channel;
-   int base_reg; /* For gen6 fb write with no header, starting from color payload directly!. */
 
    /* Reserve a space for AA - may not be needed:
     */
@@ -1428,11 +1427,6 @@ void emit_fb_write(struct brw_wm_compile *c,
     */
    brw_push_insn_state(p);
 
-   if (intel->gen >= 6)
-	base_reg = nr;
-   else
-	base_reg = 0;
-
    for (channel = 0; channel < 4; channel++) {
       if (intel->gen >= 6) {
 	 /* gen6 SIMD16 single source DP write looks like:
@@ -1524,15 +1518,20 @@ void emit_fb_write(struct brw_wm_compile *c,
    }
 
    if (intel->gen >= 6) {
-      /* Subtract off the message header, since we send headerless. */
-      nr -= 2;
+      /* Load the message header.  There's no implied move from src0
+       * to the base mrf on gen6.
+       */
+      brw_push_insn_state(p);
+      brw_set_mask_control(p, BRW_MASK_DISABLE);
+      brw_MOV(p, brw_message_reg(0), brw_vec8_grf(0, 0));
+      brw_pop_insn_state(p);
    }
 
    if (!c->runtime_check_aads_emit) {
       if (c->aa_dest_stencil_reg)
 	 emit_aa(c, arg1, 2);
 
-      fire_fb_write(c, base_reg, nr, target, eot);
+      fire_fb_write(c, 0, nr, target, eot);
    }
    else {
       struct brw_reg v1_null_ud = vec1(retype(brw_null_reg(), BRW_REGISTER_TYPE_UD));