draw: Replace vcache by vsplit.

vcache decomposes primitives while vsplit splits primitives.  Splitting
is generally easier to do and is faster.  More importantly, vcache
depends on flatshade_first to decompose.  The outputs may have incorrect
vertex order which is significant to GS.

src/gallium/auxiliary/draw/draw_pipe.c

@@ -169,10 +169,6 @@ static void do_triangle( struct draw_context *draw,
 /*
  * Set up macros for draw_pt_decompose.h template code.
  * This code uses vertex indexes / elements.
- *
- * Flags are needed by the stipple and unfilled stages.  When the two stages
- * are active, vcache_run_extras is called and the flags are stored in the
- * higher bits of i0.  Otherwise, flags do not matter.
  */
 
 #define TRIANGLE(flags,i0,i1,i2)                                  \
@@ -180,7 +176,7 @@ static void do_triangle( struct draw_context *draw,
       assert(!((i1) & DRAW_PIPE_FLAG_MASK));                      \
       assert(!((i2) & DRAW_PIPE_FLAG_MASK));                      \
       do_triangle( draw,                                          \
-                   i0,  /* flags */                               \
+                   flags,                                         \
                    verts + stride * (i0 & ~DRAW_PIPE_FLAG_MASK),  \
                    verts + stride * (i1),                         \
                    verts + stride * (i2) );                       \
@@ -190,7 +186,7 @@ static void do_triangle( struct draw_context *draw,
    do {                                                           \
       assert(!((i1) & DRAW_PIPE_FLAG_MASK));                      \
       do_line( draw,                                              \
-               i0, /* flags */                                    \
+               flags,                                             \
                verts + stride * (i0 & ~DRAW_PIPE_FLAG_MASK),      \
                verts + stride * (i1) );                           \
    } while (0)

src/gallium/auxiliary/draw/draw_private.h

@@ -140,7 +140,6 @@ struct draw_context
       } middle;
 
       struct {
-         struct draw_pt_front_end *vcache;
          struct draw_pt_front_end *vsplit;
       } front;
 

src/gallium/auxiliary/draw/draw_pt.c

@@ -48,7 +48,7 @@ DEBUG_GET_ONCE_BOOL_OPTION(draw_use_llvm, "DRAW_USE_LLVM", TRUE)
 #endif
 
 /* Overall we split things into:
- *     - frontend -- prepare fetch_elts, draw_elts - eg vcache
+ *     - frontend -- prepare fetch_elts, draw_elts - eg vsplit
  *     - middle   -- fetch, shade, cliptest, viewport
  *     - pipeline -- the prim pipeline: clipping, wide lines, etc 
  *     - backend  -- the vbuf_render provided by the driver.
@@ -106,15 +106,7 @@ draw_pt_arrays(struct draw_context *draw,
          middle = draw->pt.middle.general;
    }
 
-
-   /* Pick the right frontend
-    */
-   if (draw->pt.user.elts || (opt & PT_PIPELINE)) {
-      frontend = draw->pt.front.vcache;
-   }
-   else {
-      frontend = draw->pt.front.vsplit;
-   }
+   frontend = draw->pt.front.vsplit;
 
    frontend->prepare( frontend, prim, middle, opt );
 
@@ -131,10 +123,6 @@ boolean draw_pt_init( struct draw_context *draw )
    draw->pt.test_fse = debug_get_option_draw_fse();
    draw->pt.no_fse = debug_get_option_draw_no_fse();
 
-   draw->pt.front.vcache = draw_pt_vcache( draw );
-   if (!draw->pt.front.vcache)
-      return FALSE;
-
    draw->pt.front.vsplit = draw_pt_vsplit(draw);
    if (!draw->pt.front.vsplit)
       return FALSE;
@@ -182,11 +170,6 @@ void draw_pt_destroy( struct draw_context *draw )
       draw->pt.middle.fetch_shade_emit = NULL;
    }
 
-   if (draw->pt.front.vcache) {
-      draw->pt.front.vcache->destroy( draw->pt.front.vcache );
-      draw->pt.front.vcache = NULL;
-   }
-
    if (draw->pt.front.vsplit) {
       draw->pt.front.vsplit->destroy( draw->pt.front.vsplit );
       draw->pt.front.vsplit = NULL;