i965: clip: Move hpos_offest and ndc_offset into local functions.

The offsets within the VUE of HPOS and NDC are needed only in a few
auxiliary clipping functions.  This patch moves computation of those
offsets into the functions that need them, and does the computation
using the VUE map.

Reviewed-by: Eric Anholt <eric@anholt.net>

6 files changed, 29 insertions, 17 deletions

diff --git a/src/mesa/drivers/dri/i965/brw_clip.c b/src/mesa/drivers/dri/i965/brw_clip.c
index f9f3fd4..f5ae966 100644
--- a/src/mesa/drivers/dri/i965/brw_clip.c
+++ b/src/mesa/drivers/dri/i965/brw_clip.c
@@ -77,8 +77,6 @@ static void compile_clip_prog( struct brw_context *brw,
    /* Need to locate the two positions present in vertex + header.
     * These are currently hardcoded:
     */
-   c.ndc_offset = ATTR_SIZE;
-
    if (intel->gen == 5)
       header_regs = 3;
    else
diff --git a/src/mesa/drivers/dri/i965/brw_clip.h b/src/mesa/drivers/dri/i965/brw_clip.h
index 4e4166c..abd35d2 100644
--- a/src/mesa/drivers/dri/i965/brw_clip.h
+++ b/src/mesa/drivers/dri/i965/brw_clip.h
@@ -115,7 +115,6 @@ struct brw_clip_compile {
 
    GLboolean need_direction;
 
-   GLuint ndc_offset;
    /** Mapping from VERT_RESULT_* to offset within the VUE. */
    GLuint offset[VERT_RESULT_MAX];
    /** Mapping from attribute index to VERT_RESULT_* */
diff --git a/src/mesa/drivers/dri/i965/brw_clip_line.c b/src/mesa/drivers/dri/i965/brw_clip_line.c
index d771853..9e019c8 100644
--- a/src/mesa/drivers/dri/i965/brw_clip_line.c
+++ b/src/mesa/drivers/dri/i965/brw_clip_line.c
@@ -134,6 +134,8 @@ static void clip_and_emit_line( struct brw_clip_compile *c )
    struct brw_indirect plane_ptr = brw_indirect(4, 0);
    struct brw_instruction *plane_loop;
    struct brw_reg v1_null_ud = retype(vec1(brw_null_reg()), BRW_REGISTER_TYPE_UD);
+   GLuint hpos_offset = brw_vert_result_to_offset(&c->vue_map,
+                                                  VERT_RESULT_HPOS);
 
    brw_MOV(p, get_addr_reg(vtx0),      brw_address(c->reg.vertex[0]));
    brw_MOV(p, get_addr_reg(vtx1),      brw_address(c->reg.vertex[1]));
@@ -174,12 +176,12 @@ static void clip_and_emit_line( struct brw_clip_compile *c )
 
 	 /* dp = DP4(vtx->position, plane) 
 	  */
-	 brw_DP4(p, vec4(c->reg.dp0), deref_4f(vtx0, c->offset[VERT_RESULT_HPOS]), c->reg.plane_equation);
+	 brw_DP4(p, vec4(c->reg.dp0), deref_4f(vtx0, hpos_offset), c->reg.plane_equation);
 
 	 /* if (IS_NEGATIVE(dp1)) 
 	  */
 	 brw_set_conditionalmod(p, BRW_CONDITIONAL_L);
-	 brw_DP4(p, vec4(c->reg.dp1), deref_4f(vtx1, c->offset[VERT_RESULT_HPOS]), c->reg.plane_equation);
+	 brw_DP4(p, vec4(c->reg.dp1), deref_4f(vtx1, hpos_offset), c->reg.plane_equation);
 	 brw_IF(p, BRW_EXECUTE_1);
 	 {
              /*
diff --git a/src/mesa/drivers/dri/i965/brw_clip_tri.c b/src/mesa/drivers/dri/i965/brw_clip_tri.c
index 0dca05d..0f938fe 100644
--- a/src/mesa/drivers/dri/i965/brw_clip_tri.c
+++ b/src/mesa/drivers/dri/i965/brw_clip_tri.c
@@ -231,6 +231,8 @@ void brw_clip_tri( struct brw_clip_compile *c )
    struct brw_indirect freelist_ptr = brw_indirect(6, 0);
    struct brw_instruction *plane_loop;
    struct brw_instruction *vertex_loop;
+   GLuint hpos_offset = brw_vert_result_to_offset(&c->vue_map,
+                                                  VERT_RESULT_HPOS);
    
    brw_MOV(p, get_addr_reg(vtxPrev),     brw_address(c->reg.vertex[2]) );
    brw_MOV(p, get_addr_reg(plane_ptr),   brw_clip_plane0_address(c));
@@ -269,13 +271,13 @@ void brw_clip_tri( struct brw_clip_compile *c )
 
 	    /* IS_NEGATIVE(prev) */
 	    brw_set_conditionalmod(p, BRW_CONDITIONAL_L);
-	    brw_DP4(p, vec4(c->reg.dpPrev), deref_4f(vtxPrev, c->offset[VERT_RESULT_HPOS]), c->reg.plane_equation);
+	    brw_DP4(p, vec4(c->reg.dpPrev), deref_4f(vtxPrev, hpos_offset), c->reg.plane_equation);
 	    brw_IF(p, BRW_EXECUTE_1);
 	    {
 	       /* IS_POSITIVE(next)
 		*/
 	       brw_set_conditionalmod(p, BRW_CONDITIONAL_GE);
-	       brw_DP4(p, vec4(c->reg.dp), deref_4f(vtx, c->offset[VERT_RESULT_HPOS]), c->reg.plane_equation);
+	       brw_DP4(p, vec4(c->reg.dp), deref_4f(vtx, hpos_offset), c->reg.plane_equation);
 	       brw_IF(p, BRW_EXECUTE_1);
 	       {
 
@@ -317,7 +319,7 @@ void brw_clip_tri( struct brw_clip_compile *c )
 	       /* IS_NEGATIVE(next)
 		*/
 	       brw_set_conditionalmod(p, BRW_CONDITIONAL_L);
-	       brw_DP4(p, vec4(c->reg.dp), deref_4f(vtx, c->offset[VERT_RESULT_HPOS]), c->reg.plane_equation);
+	       brw_DP4(p, vec4(c->reg.dp), deref_4f(vtx, hpos_offset), c->reg.plane_equation);
 	       brw_IF(p, BRW_EXECUTE_1);
 	       {
 		  /* Going out of bounds.  Avoid division by zero as we
@@ -477,12 +479,15 @@ static void brw_clip_test( struct brw_clip_compile *c )
     struct brw_compile *p = &c->func;
     struct brw_reg tmp0 = c->reg.loopcount; /* handy temporary */
 
+    GLuint hpos_offset = brw_vert_result_to_offset(&c->vue_map,
+                                                   VERT_RESULT_HPOS);
+
     brw_MOV(p, get_addr_reg(vt0), brw_address(c->reg.vertex[0]));
     brw_MOV(p, get_addr_reg(vt1), brw_address(c->reg.vertex[1]));
     brw_MOV(p, get_addr_reg(vt2), brw_address(c->reg.vertex[2]));
-    brw_MOV(p, v0, deref_4f(vt0, c->offset[VERT_RESULT_HPOS]));
-    brw_MOV(p, v1, deref_4f(vt1, c->offset[VERT_RESULT_HPOS]));
-    brw_MOV(p, v2, deref_4f(vt2, c->offset[VERT_RESULT_HPOS]));
+    brw_MOV(p, v0, deref_4f(vt0, hpos_offset));
+    brw_MOV(p, v1, deref_4f(vt1, hpos_offset));
+    brw_MOV(p, v2, deref_4f(vt2, hpos_offset));
     brw_AND(p, c->reg.planemask, c->reg.planemask, brw_imm_ud(~0x3f));
 
     /* test nearz, xmin, ymin plane */
diff --git a/src/mesa/drivers/dri/i965/brw_clip_unfilled.c b/src/mesa/drivers/dri/i965/brw_clip_unfilled.c
index 97f3219..da58796 100644
--- a/src/mesa/drivers/dri/i965/brw_clip_unfilled.c
+++ b/src/mesa/drivers/dri/i965/brw_clip_unfilled.c
@@ -52,9 +52,11 @@ static void compute_tri_direction( struct brw_clip_compile *c )
    struct brw_compile *p = &c->func;
    struct brw_reg e = c->reg.tmp0;
    struct brw_reg f = c->reg.tmp1;
-   struct brw_reg v0 = byte_offset(c->reg.vertex[0], c->offset[VERT_RESULT_HPOS]); 
-   struct brw_reg v1 = byte_offset(c->reg.vertex[1], c->offset[VERT_RESULT_HPOS]); 
-   struct brw_reg v2 = byte_offset(c->reg.vertex[2], c->offset[VERT_RESULT_HPOS]); 
+   GLuint hpos_offset = brw_vert_result_to_offset(&c->vue_map,
+                                                  VERT_RESULT_HPOS);
+   struct brw_reg v0 = byte_offset(c->reg.vertex[0], hpos_offset);
+   struct brw_reg v1 = byte_offset(c->reg.vertex[1], hpos_offset);
+   struct brw_reg v2 = byte_offset(c->reg.vertex[2], hpos_offset);
 
 
    struct brw_reg v0n = get_tmp(c);
@@ -236,7 +238,9 @@ static void apply_one_offset( struct brw_clip_compile *c,
 			  struct brw_indirect vert )
 {
    struct brw_compile *p = &c->func;
-   struct brw_reg z = deref_1f(vert, c->ndc_offset +
+   GLuint ndc_offset = brw_vert_result_to_offset(&c->vue_map,
+                                                 BRW_VERT_RESULT_NDC);
+   struct brw_reg z = deref_1f(vert, ndc_offset +
 			       2 * type_sz(BRW_REGISTER_TYPE_F));
 
    brw_ADD(p, z, z, vec1(c->reg.offset));
diff --git a/src/mesa/drivers/dri/i965/brw_clip_util.c b/src/mesa/drivers/dri/i965/brw_clip_util.c
index 7e29983..8cbb2ff 100644
--- a/src/mesa/drivers/dri/i965/brw_clip_util.c
+++ b/src/mesa/drivers/dri/i965/brw_clip_util.c
@@ -109,13 +109,17 @@ static void brw_clip_project_vertex( struct brw_clip_compile *c,
 {
    struct brw_compile *p = &c->func;
    struct brw_reg tmp = get_tmp(c);
+   GLuint hpos_offset = brw_vert_result_to_offset(&c->vue_map,
+                                                  VERT_RESULT_HPOS);
+   GLuint ndc_offset = brw_vert_result_to_offset(&c->vue_map,
+                                                 BRW_VERT_RESULT_NDC);
 
    /* Fixup position.  Extract from the original vertex and re-project
     * to screen space:
     */
-   brw_MOV(p, tmp, deref_4f(vert_addr, c->offset[VERT_RESULT_HPOS]));
+   brw_MOV(p, tmp, deref_4f(vert_addr, hpos_offset));
    brw_clip_project_position(c, tmp);
-   brw_MOV(p, deref_4f(vert_addr, c->ndc_offset), tmp);
+   brw_MOV(p, deref_4f(vert_addr, ndc_offset), tmp);
 	 
    release_tmp(c, tmp);
 }