i965: Combine 4 boolean args of brw_urb_WRITE into a flags bitfield.

The arguments to brw_urb_WRITE() were getting pretty unwieldy, and we
have to add more flags to support geometry shaders anyhow.

Also plumb these flags through brw_clip_emit_vue(),
brw_set_urb_message(), and the vec4_instruction class.

Reviewed-by: Ian Romanick <ian.d.romanick@intel.com>
Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>
Reviewed-by: Matt Turner <mattst88@gmail.com>

12 files changed, 76 insertions, 71 deletions

diff --git a/src/mesa/drivers/dri/i965/brw_clip.h b/src/mesa/drivers/dri/i965/brw_clip.h
index f26d75d..5af0ad3 100644
--- a/src/mesa/drivers/dri/i965/brw_clip.h
+++ b/src/mesa/drivers/dri/i965/brw_clip.h
@@ -173,8 +173,7 @@ void brw_clip_init_planes( struct brw_clip_compile *c );
 
 void brw_clip_emit_vue(struct brw_clip_compile *c, 
 		       struct brw_indirect vert,
-		       bool allocate,
-		       bool eot,
+                       unsigned flags,
 		       GLuint header);
 
 void brw_clip_kill_thread(struct brw_clip_compile *c);
diff --git a/src/mesa/drivers/dri/i965/brw_clip_line.c b/src/mesa/drivers/dri/i965/brw_clip_line.c
index 8466b1c..5238598 100644
--- a/src/mesa/drivers/dri/i965/brw_clip_line.c
+++ b/src/mesa/drivers/dri/i965/brw_clip_line.c
@@ -282,10 +282,10 @@ static void clip_and_emit_line( struct brw_clip_compile *c )
       brw_clip_interp_vertex(c, newvtx0, vtx0, vtx1, c->reg.t0, false);
       brw_clip_interp_vertex(c, newvtx1, vtx1, vtx0, c->reg.t1, false);
 
-      brw_clip_emit_vue(c, newvtx0, 1, 0,
+      brw_clip_emit_vue(c, newvtx0, BRW_URB_WRITE_ALLOCATE_COMPLETE,
                         (_3DPRIM_LINESTRIP << URB_WRITE_PRIM_TYPE_SHIFT)
                         | URB_WRITE_PRIM_START);
-      brw_clip_emit_vue(c, newvtx1, 0, 1,
+      brw_clip_emit_vue(c, newvtx1, BRW_URB_WRITE_EOT_COMPLETE,
                         (_3DPRIM_LINESTRIP << URB_WRITE_PRIM_TYPE_SHIFT)
                         | URB_WRITE_PRIM_END);
    }
diff --git a/src/mesa/drivers/dri/i965/brw_clip_tri.c b/src/mesa/drivers/dri/i965/brw_clip_tri.c
index 1eeb995..995a890 100644
--- a/src/mesa/drivers/dri/i965/brw_clip_tri.c
+++ b/src/mesa/drivers/dri/i965/brw_clip_tri.c
@@ -466,7 +466,7 @@ void brw_clip_tri_emit_polygon(struct brw_clip_compile *c)
       brw_MOV(p, get_addr_reg(vptr), brw_address(c->reg.inlist));
       brw_MOV(p, get_addr_reg(v0), deref_1uw(vptr, 0));
 
-      brw_clip_emit_vue(c, v0, 1, 0,
+      brw_clip_emit_vue(c, v0, BRW_URB_WRITE_ALLOCATE_COMPLETE,
                         ((_3DPRIM_TRIFAN << URB_WRITE_PRIM_TYPE_SHIFT)
                          | URB_WRITE_PRIM_START));
       
@@ -475,7 +475,7 @@ void brw_clip_tri_emit_polygon(struct brw_clip_compile *c)
 
       brw_DO(p, BRW_EXECUTE_1);
       {
-	 brw_clip_emit_vue(c, v0, 1, 0,
+	 brw_clip_emit_vue(c, v0, BRW_URB_WRITE_ALLOCATE_COMPLETE,
                            (_3DPRIM_TRIFAN << URB_WRITE_PRIM_TYPE_SHIFT));
   
 	 brw_ADD(p, get_addr_reg(vptr), get_addr_reg(vptr), brw_imm_uw(2));
@@ -486,7 +486,7 @@ void brw_clip_tri_emit_polygon(struct brw_clip_compile *c)
       }
       brw_WHILE(p);
 
-      brw_clip_emit_vue(c, v0, 0, 1,
+      brw_clip_emit_vue(c, v0, BRW_URB_WRITE_EOT_COMPLETE,
                         ((_3DPRIM_TRIFAN << URB_WRITE_PRIM_TYPE_SHIFT)
                          | URB_WRITE_PRIM_END));
    }
diff --git a/src/mesa/drivers/dri/i965/brw_clip_unfilled.c b/src/mesa/drivers/dri/i965/brw_clip_unfilled.c
index af327d6..644c99a 100644
--- a/src/mesa/drivers/dri/i965/brw_clip_unfilled.c
+++ b/src/mesa/drivers/dri/i965/brw_clip_unfilled.c
@@ -319,10 +319,10 @@ static void emit_lines(struct brw_clip_compile *c,
 	      brw_imm_f(0));
       brw_IF(p, BRW_EXECUTE_1);
       {
-	 brw_clip_emit_vue(c, v0, 1, 0,
+	 brw_clip_emit_vue(c, v0, BRW_URB_WRITE_ALLOCATE_COMPLETE,
                            (_3DPRIM_LINESTRIP << URB_WRITE_PRIM_TYPE_SHIFT)
                            | URB_WRITE_PRIM_START);
-	 brw_clip_emit_vue(c, v1, 1, 0,
+	 brw_clip_emit_vue(c, v1, BRW_URB_WRITE_ALLOCATE_COMPLETE,
                            (_3DPRIM_LINESTRIP << URB_WRITE_PRIM_TYPE_SHIFT)
                            | URB_WRITE_PRIM_END);
       }
@@ -364,7 +364,7 @@ static void emit_points(struct brw_clip_compile *c,
 	 if (do_offset)
 	    apply_one_offset(c, v0);
 
-	 brw_clip_emit_vue(c, v0, 1, 0,
+	 brw_clip_emit_vue(c, v0, BRW_URB_WRITE_ALLOCATE_COMPLETE,
                            (_3DPRIM_POINTLIST << URB_WRITE_PRIM_TYPE_SHIFT)
                            | URB_WRITE_PRIM_START | URB_WRITE_PRIM_END);
       }
diff --git a/src/mesa/drivers/dri/i965/brw_clip_util.c b/src/mesa/drivers/dri/i965/brw_clip_util.c
index 62172ec..d5c50d7 100644
--- a/src/mesa/drivers/dri/i965/brw_clip_util.c
+++ b/src/mesa/drivers/dri/i965/brw_clip_util.c
@@ -313,15 +313,18 @@ void brw_clip_interp_vertex( struct brw_clip_compile *c,
 
 void brw_clip_emit_vue(struct brw_clip_compile *c, 
 		       struct brw_indirect vert,
-		       bool allocate,
-		       bool eot,
+                       unsigned flags,
 		       GLuint header)
 {
    struct brw_compile *p = &c->func;
+   bool allocate = flags & BRW_URB_WRITE_ALLOCATE;
 
    brw_clip_ff_sync(c);
 
-   assert(!(allocate && eot));
+   /* Any URB entry that is allocated must subsequently be used or discarded,
+    * so it doesn't make sense to mark EOT and ALLOCATE at the same time.
+    */
+   assert(!(allocate && (flags & BRW_URB_WRITE_EOT)));
 
    /* Copy the vertex from vertn into m1..mN+1:
     */
@@ -343,12 +346,9 @@ void brw_clip_emit_vue(struct brw_clip_compile *c,
 		 allocate ? c->reg.R0 : retype(brw_null_reg(), BRW_REGISTER_TYPE_UD),
 		 0,
 		 c->reg.R0,
-		 allocate,
-		 1,		/* used */
+                 flags,
 		 c->nr_regs + 1, /* msg length */
 		 allocate ? 1 : 0, /* response_length */ 
-		 eot,		/* eot */
-		 1,		/* writes_complete */
 		 0,		/* urb offset */
 		 BRW_URB_SWIZZLE_NONE);
 }
@@ -367,12 +367,9 @@ void brw_clip_kill_thread(struct brw_clip_compile *c)
 		 retype(brw_null_reg(), BRW_REGISTER_TYPE_UD),
 		 0,
 		 c->reg.R0,
-		 0,		/* allocate */
-		 0,		/* used */
+                 BRW_URB_WRITE_UNUSED | BRW_URB_WRITE_EOT_COMPLETE,
 		 1, 		/* msg len */
 		 0, 		/* response len */
-		 1, 		/* eot */
-		 1,		/* writes complete */
 		 0,
 		 BRW_URB_SWIZZLE_NONE);
 }
diff --git a/src/mesa/drivers/dri/i965/brw_eu.h b/src/mesa/drivers/dri/i965/brw_eu.h
index 0e08e89..ae4cab5 100644
--- a/src/mesa/drivers/dri/i965/brw_eu.h
+++ b/src/mesa/drivers/dri/i965/brw_eu.h
@@ -228,16 +228,50 @@ void brw_set_dp_write_message(struct brw_compile *p,
 			      GLuint end_of_thread,
 			      GLuint send_commit_msg);
 
+enum brw_urb_write_flags {
+   /**
+    * Causes a new URB entry to be allocated, and its address stored in the
+    * destination register (gen < 7).
+    */
+   BRW_URB_WRITE_ALLOCATE = 0x1,
+
+   /**
+    * Causes the current URB entry to be deallocated (gen < 7).
+    */
+   BRW_URB_WRITE_UNUSED = 0x2,
+
+   /**
+    * Causes the thread to terminate.
+    */
+   BRW_URB_WRITE_EOT = 0x4,
+
+   /**
+    * Indicates that the given URB entry is complete, and may be sent further
+    * down the 3D pipeline (gen < 7).
+    */
+   BRW_URB_WRITE_COMPLETE = 0x8,
+
+   /**
+    * Convenient combination of flags: end the thread while simultaneously
+    * marking the given URB entry as complete.
+    */
+   BRW_URB_WRITE_EOT_COMPLETE = BRW_URB_WRITE_EOT | BRW_URB_WRITE_COMPLETE,
+
+   /**
+    * Convenient combination of flags: mark the given URB entry as complete
+    * and simultaneously allocate a new one.
+    */
+   BRW_URB_WRITE_ALLOCATE_COMPLETE =
+      BRW_URB_WRITE_ALLOCATE | BRW_URB_WRITE_COMPLETE,
+};
+
 void brw_urb_WRITE(struct brw_compile *p,
 		   struct brw_reg dest,
 		   GLuint msg_reg_nr,
 		   struct brw_reg src0,
-		   bool allocate,
-		   bool used,
+                   unsigned flags,
 		   GLuint msg_length,
 		   GLuint response_length,
-		   bool eot,
-		   bool writes_complete,
 		   GLuint offset,
 		   GLuint swizzle);
 
diff --git a/src/mesa/drivers/dri/i965/brw_eu_emit.c b/src/mesa/drivers/dri/i965/brw_eu_emit.c
index 204cea2..622b22f 100644
--- a/src/mesa/drivers/dri/i965/brw_eu_emit.c
+++ b/src/mesa/drivers/dri/i965/brw_eu_emit.c
@@ -515,19 +515,17 @@ static void brw_set_ff_sync_message(struct brw_compile *p,
 
 static void brw_set_urb_message( struct brw_compile *p,
 				 struct brw_instruction *insn,
-				 bool allocate,
-				 bool used,
+                                 unsigned flags,
 				 GLuint msg_length,
 				 GLuint response_length,
-				 bool end_of_thread,
-				 bool complete,
 				 GLuint offset,
 				 GLuint swizzle_control )
 {
    struct brw_context *brw = p->brw;
 
    brw_set_message_descriptor(p, insn, BRW_SFID_URB,
-			      msg_length, response_length, true, end_of_thread);
+			      msg_length, response_length, true,
+                              flags & BRW_URB_WRITE_EOT);
    if (brw->gen == 7) {
       insn->bits3.urb_gen7.opcode = 0;	/* URB_WRITE_HWORD */
       insn->bits3.urb_gen7.offset = offset;
@@ -535,21 +533,21 @@ static void brw_set_urb_message( struct brw_compile *p,
       insn->bits3.urb_gen7.swizzle_control = swizzle_control;
       /* per_slot_offset = 0 makes it ignore offsets in message header */
       insn->bits3.urb_gen7.per_slot_offset = 0;
-      insn->bits3.urb_gen7.complete = complete;
+      insn->bits3.urb_gen7.complete = flags & BRW_URB_WRITE_COMPLETE ? 1 : 0;
    } else if (brw->gen >= 5) {
       insn->bits3.urb_gen5.opcode = 0;	/* URB_WRITE */
       insn->bits3.urb_gen5.offset = offset;
       insn->bits3.urb_gen5.swizzle_control = swizzle_control;
-      insn->bits3.urb_gen5.allocate = allocate;
-      insn->bits3.urb_gen5.used = used;	/* ? */
-      insn->bits3.urb_gen5.complete = complete;
+      insn->bits3.urb_gen5.allocate = flags & BRW_URB_WRITE_ALLOCATE ? 1 : 0;
+      insn->bits3.urb_gen5.used = flags & BRW_URB_WRITE_UNUSED ? 0 : 1;
+      insn->bits3.urb_gen5.complete = flags & BRW_URB_WRITE_COMPLETE ? 1 : 0;
    } else {
       insn->bits3.urb.opcode = 0;	/* ? */
       insn->bits3.urb.offset = offset;
       insn->bits3.urb.swizzle_control = swizzle_control;
-      insn->bits3.urb.allocate = allocate;
-      insn->bits3.urb.used = used;	/* ? */
-      insn->bits3.urb.complete = complete;
+      insn->bits3.urb.allocate = flags & BRW_URB_WRITE_ALLOCATE ? 1 : 0;
+      insn->bits3.urb.used = flags & BRW_URB_WRITE_UNUSED ? 0 : 1;
+      insn->bits3.urb.complete = flags & BRW_URB_WRITE_COMPLETE ? 1 : 0;
    }
 }
 
@@ -2215,12 +2213,9 @@ void brw_urb_WRITE(struct brw_compile *p,
 		   struct brw_reg dest,
 		   GLuint msg_reg_nr,
 		   struct brw_reg src0,
-		   bool allocate,
-		   bool used,
+                   unsigned flags,
 		   GLuint msg_length,
 		   GLuint response_length,
-		   bool eot,
-		   bool writes_complete,
 		   GLuint offset,
 		   GLuint swizzle)
 {
@@ -2254,12 +2249,9 @@ void brw_urb_WRITE(struct brw_compile *p,
 
    brw_set_urb_message(p,
 		       insn,
-		       allocate,
-		       used,
+		       flags,
 		       msg_length,
 		       response_length, 
-		       eot, 
-		       writes_complete, 
 		       offset,
 		       swizzle);
 }
diff --git a/src/mesa/drivers/dri/i965/brw_gs_emit.c b/src/mesa/drivers/dri/i965/brw_gs_emit.c
index 6034a9d..fff3585 100644
--- a/src/mesa/drivers/dri/i965/brw_gs_emit.c
+++ b/src/mesa/drivers/dri/i965/brw_gs_emit.c
@@ -185,12 +185,10 @@ static void brw_gs_emit_vue(struct brw_gs_compile *c,
                           : retype(brw_null_reg(), BRW_REGISTER_TYPE_UD),
 		 0,
 		 c->reg.header,
-		 allocate,
-		 1,		/* used */
+		 allocate ? BRW_URB_WRITE_ALLOCATE_COMPLETE
+                          : BRW_URB_WRITE_EOT_COMPLETE,
 		 c->nr_regs + 1, /* msg length */
 		 allocate ? 1 : 0, /* response length */
-		 allocate ? 0 : 1, /* eot */
-		 1,		/* writes_complete */
 		 0,		/* urb offset */
 		 BRW_URB_SWIZZLE_NONE);
 
diff --git a/src/mesa/drivers/dri/i965/brw_sf_emit.c b/src/mesa/drivers/dri/i965/brw_sf_emit.c
index 0131de5..d329bef 100644
--- a/src/mesa/drivers/dri/i965/brw_sf_emit.c
+++ b/src/mesa/drivers/dri/i965/brw_sf_emit.c
@@ -491,12 +491,9 @@ void brw_emit_tri_setup(struct brw_sf_compile *c, bool allocate)
 		       brw_null_reg(),
 		       0,
 		       brw_vec8_grf(0, 0), /* r0, will be copied to m0 */
-		       0, 	/* allocate */
-		       1,	/* used */
+                       last ? BRW_URB_WRITE_EOT_COMPLETE : 0,
 		       4, 	/* msg len */
 		       0,	/* response len */
-		       last,	/* eot */
-		       last, 	/* writes complete */
 		       i*4,	/* offset */
 		       BRW_URB_SWIZZLE_TRANSPOSE); /* XXX: Swizzle control "SF to windower" */
       }
@@ -565,12 +562,9 @@ void brw_emit_line_setup(struct brw_sf_compile *c, bool allocate)
 		       brw_null_reg(),
 		       0,
 		       brw_vec8_grf(0, 0),
-		       0, 	/* allocate */
-		       1, 	/* used */
+                       last ? BRW_URB_WRITE_EOT_COMPLETE : 0,
 		       4, 	/* msg len */
 		       0,	/* response len */
-		       last, 	/* eot */
-		       last, 	/* writes complete */
 		       i*4,	/* urb destination offset */
 		       BRW_URB_SWIZZLE_TRANSPOSE); 
       }
@@ -655,12 +649,9 @@ void brw_emit_point_sprite_setup(struct brw_sf_compile *c, bool allocate)
 		    brw_null_reg(),
 		    0,
 		    brw_vec8_grf(0, 0),
-		    0, 	/* allocate */
-		    1,	/* used */
+                    last ? BRW_URB_WRITE_EOT_COMPLETE : 0,
 		    4, 	/* msg len */
 		    0,	/* response len */
-		    last, 	/* eot */
-		    last, 	/* writes complete */
 		    i*4,	/* urb destination offset */
 		    BRW_URB_SWIZZLE_TRANSPOSE);
    }
@@ -715,12 +706,9 @@ void brw_emit_point_setup(struct brw_sf_compile *c, bool allocate)
 		       brw_null_reg(),
 		       0,
 		       brw_vec8_grf(0, 0),
-		       0, 	/* allocate */
-		       1,	/* used */
+                       last ? BRW_URB_WRITE_EOT_COMPLETE : 0,
 		       4, 	/* msg len */
 		       0,	/* response len */
-		       last, 	/* eot */
-		       last, 	/* writes complete */
 		       i*4,	/* urb destination offset */
 		       BRW_URB_SWIZZLE_TRANSPOSE);
       }
diff --git a/src/mesa/drivers/dri/i965/brw_vec4.h b/src/mesa/drivers/dri/i965/brw_vec4.h
index 171f14d..a398f71 100644
--- a/src/mesa/drivers/dri/i965/brw_vec4.h
+++ b/src/mesa/drivers/dri/i965/brw_vec4.h
@@ -222,7 +222,7 @@ public:
    int target; /**< MRT target. */
    bool shadow_compare;
 
-   bool eot;
+   unsigned urb_write_flags;
    bool header_present;
    int mlen; /**< SEND message length */
    int base_mrf; /**< First MRF in the SEND message, if mlen is nonzero. */
diff --git a/src/mesa/drivers/dri/i965/brw_vec4_emit.cpp b/src/mesa/drivers/dri/i965/brw_vec4_emit.cpp
index 53b4bf2..89831de 100644
--- a/src/mesa/drivers/dri/i965/brw_vec4_emit.cpp
+++ b/src/mesa/drivers/dri/i965/brw_vec4_emit.cpp
@@ -405,12 +405,9 @@ vec4_generator::generate_urb_write(vec4_instruction *inst)
 		 brw_null_reg(), /* dest */
 		 inst->base_mrf, /* starting mrf reg nr */
 		 brw_vec8_grf(0, 0), /* src */
-		 false,		/* allocate */
-		 true,		/* used */
+                 inst->urb_write_flags,
 		 inst->mlen,
 		 0,		/* response len */
-		 inst->eot,	/* eot */
-		 inst->eot,	/* writes complete */
 		 inst->offset,	/* urb destination offset */
 		 BRW_URB_SWIZZLE_INTERLEAVE);
 }
diff --git a/src/mesa/drivers/dri/i965/brw_vec4_visitor.cpp b/src/mesa/drivers/dri/i965/brw_vec4_visitor.cpp
index c307049..72841e7 100644
--- a/src/mesa/drivers/dri/i965/brw_vec4_visitor.cpp
+++ b/src/mesa/drivers/dri/i965/brw_vec4_visitor.cpp
@@ -2788,7 +2788,7 @@ vec4_vs_visitor::emit_urb_write_opcode(bool complete)
    }
 
    vec4_instruction *inst = emit(VS_OPCODE_URB_WRITE);
-   inst->eot = complete;
+   inst->urb_write_flags = complete ? BRW_URB_WRITE_EOT_COMPLETE : 0;
 
    return inst;
 }