From a072f0e186522f9de2848989422ad0244f65c961 Mon Sep 17 00:00:00 2001
From: Chia-I Wu <olv@lunarg.com>
Date: Sat, 14 Aug 2010 00:05:28 +0800
Subject: [PATCH] drwa: Add PRIMITIVE macro to vsplit.

PRIMITIVE is used by the indexed path to flush the entire primitive with
custom vertex count checks.  It replaces the existing fast path.
---
 .../auxiliary/draw/draw_pt_vsplit_tmp.h       | 46 +++++++++++--------
 src/gallium/auxiliary/draw/draw_split_tmp.h   |  5 ++
 2 files changed, 31 insertions(+), 20 deletions(-)

diff --git a/src/gallium/auxiliary/draw/draw_pt_vsplit_tmp.h b/src/gallium/auxiliary/draw/draw_pt_vsplit_tmp.h
index efeaa567113..4bb57b1493f 100644
--- a/src/gallium/auxiliary/draw/draw_pt_vsplit_tmp.h
+++ b/src/gallium/auxiliary/draw/draw_pt_vsplit_tmp.h
@@ -34,9 +34,8 @@
  * (rebased) index buffer as the draw elements.
  */
 static boolean
-CONCAT(vsplit_segment_fast_, ELT_TYPE)(struct vsplit_frontend *vsplit,
-                                       unsigned flags,
-                                       unsigned istart, unsigned icount)
+CONCAT(vsplit_primitive_, ELT_TYPE)(struct vsplit_frontend *vsplit,
+                                    unsigned istart, unsigned icount)
 {
    struct draw_context *draw = vsplit->draw;
    const ELT_TYPE *ib = (const ELT_TYPE *) draw->pt.user.elts;
@@ -44,10 +43,25 @@ CONCAT(vsplit_segment_fast_, ELT_TYPE)(struct vsplit_frontend *vsplit,
    const unsigned max_index = draw->pt.user.max_index;
    const int elt_bias = draw->pt.user.eltBias;
    unsigned fetch_start, fetch_count;
-   const ushort *draw_elts;
+   const ushort *draw_elts = NULL;
    unsigned i;
 
-   assert(icount <= vsplit->segment_size);
+   /* use the ib directly */
+   if (min_index == 0 && sizeof(ib[0]) == sizeof(draw_elts[0])) {
+      if (icount > vsplit->max_vertices)
+         return FALSE;
+
+      for (i = 0; i < icount; i++) {
+         ELT_TYPE idx = ib[istart + i];
+         assert(idx >= min_index && idx <= max_index);
+      }
+      draw_elts = (const ushort *) ib;
+   }
+   else {
+      /* have to go through vsplit->draw_elts */
+      if (icount > vsplit->segment_size)
+         return FALSE;
+   }
 
    /* this is faster only when we fetch less elements than the normal path */
    if (max_index - min_index > icount - 1)
@@ -65,14 +79,7 @@ CONCAT(vsplit_segment_fast_, ELT_TYPE)(struct vsplit_frontend *vsplit,
    fetch_start = min_index + elt_bias;
    fetch_count = max_index - min_index + 1;
 
-   if (min_index == 0 && sizeof(ib[0]) == sizeof(draw_elts[0])) {
-      for (i = 0; i < icount; i++) {
-         ELT_TYPE idx = ib[istart + i];
-         assert(idx >= min_index && idx <= max_index);
-      }
-      draw_elts = (const ushort *) ib;
-   }
-   else {
+   if (!draw_elts) {
       if (min_index == 0) {
          for (i = 0; i < icount; i++) {
             ELT_TYPE idx = ib[istart + i];
@@ -95,7 +102,7 @@ CONCAT(vsplit_segment_fast_, ELT_TYPE)(struct vsplit_frontend *vsplit,
 
    return vsplit->middle->run_linear_elts(vsplit->middle,
                                           fetch_start, fetch_count,
-                                          draw_elts, icount, flags);
+                                          draw_elts, icount, 0x0);
 }
 
 /**
@@ -170,12 +177,6 @@ CONCAT(vsplit_segment_simple_, ELT_TYPE)(struct vsplit_frontend *vsplit,
                                          unsigned istart,
                                          unsigned icount)
 {
-   /* the primitive is not splitted */
-   if (!(flags)) {
-      if (CONCAT(vsplit_segment_fast_, ELT_TYPE)(vsplit,
-               flags, istart, icount))
-         return;
-   }
    CONCAT(vsplit_segment_cache_, ELT_TYPE)(vsplit,
          flags, istart, icount, FALSE, 0, FALSE, 0);
 }
@@ -213,6 +214,9 @@ CONCAT(vsplit_segment_fan_, ELT_TYPE)(struct vsplit_frontend *vsplit,
    const unsigned max_count_loop = vsplit->segment_size - 1;               \
    const unsigned max_count_fan = vsplit->segment_size;
 
+#define PRIMITIVE(istart, icount)   \
+   CONCAT(vsplit_primitive_, ELT_TYPE)(vsplit, istart, icount)
+
 #else /* ELT_TYPE */
 
 static void
@@ -274,6 +278,8 @@ vsplit_segment_fan_linear(struct vsplit_frontend *vsplit, unsigned flags,
    const unsigned max_count_loop = vsplit->segment_size - 1;               \
    const unsigned max_count_fan = vsplit->segment_size;
 
+#define PRIMITIVE(istart, icount) FALSE
+
 #define ELT_TYPE linear
 
 #endif /* ELT_TYPE */
diff --git a/src/gallium/auxiliary/draw/draw_split_tmp.h b/src/gallium/auxiliary/draw/draw_split_tmp.h
index 40ab0b71f14..47defc62b96 100644
--- a/src/gallium/auxiliary/draw/draw_split_tmp.h
+++ b/src/gallium/auxiliary/draw/draw_split_tmp.h
@@ -47,6 +47,10 @@ FUNC(FUNC_VARS)
    if (count < first)
       return;
 
+   /* try flushing the entire primitive */
+   if (PRIMITIVE(start, count))
+      return;
+
    /* must be able to at least flush two complete primitives */
    assert(max_count_simple >= first + incr &&
           max_count_loop >= first + incr &&
@@ -166,6 +170,7 @@ FUNC(FUNC_VARS)
 #undef FUNC_VARS
 #undef LOCAL_VARS
 
+#undef PRIMITIVE
 #undef SEGMENT_SIMPLE
 #undef SEGMENT_LOOP
 #undef SEGMENT_FAN
-- 
2.30.2