draw: No need to make max_vertices even.

Triangle strip alternates the front/back orientation of its triangles.
max_vertices was made even so that varray never splitted a triangle
strip at the wrong positions.

It did not work with triangle strips with adjacencies.  And it is no
longer relevant with vsplit.

src/gallium/auxiliary/draw/draw_pipe_vbuf.c

@@ -353,9 +353,6 @@ vbuf_alloc_vertices( struct vbuf_stage *vbuf )
    /* Allocate a new vertex buffer */
    vbuf->max_vertices = vbuf->render->max_vertex_buffer_bytes / vbuf->vertex_size;
 
-   /* even number */
-   vbuf->max_vertices = vbuf->max_vertices & ~1;
-
    if(vbuf->max_vertices >= UNDEFINED_VERTEX_ID)
       vbuf->max_vertices = UNDEFINED_VERTEX_ID - 1;
 

src/gallium/auxiliary/draw/draw_pt_emit.c

@@ -120,9 +120,6 @@ void draw_pt_emit_prepare( struct pt_emit *emit,
 
    *max_vertices = (draw->render->max_vertex_buffer_bytes / 
                     (vinfo->size * 4));
-
-   /* even number */
-   *max_vertices = *max_vertices & ~1;
 }
 
 

src/gallium/auxiliary/draw/draw_pt_fetch_emit.c

@@ -191,15 +191,6 @@ static void fetch_emit_prepare( struct draw_pt_middle_end *middle,
 
    *max_vertices = (draw->render->max_vertex_buffer_bytes / 
                     (vinfo->size * 4));
-
-   /* Return an even number of verts.
-    * This prevents "parity" errors when splitting long triangle strips which
-    * can lead to front/back culling mix-ups.
-    * Every other triangle in a strip has an alternate front/back orientation
-    * so splitting at an odd position can cause the orientation of subsequent
-    * triangles to get reversed.
-    */
-   *max_vertices = *max_vertices & ~1;
 }
 
 

src/gallium/auxiliary/draw/draw_pt_fetch_shade_emit.c

@@ -175,15 +175,6 @@ static void fse_prepare( struct draw_pt_middle_end *middle,
    *max_vertices = (draw->render->max_vertex_buffer_bytes / 
                     (vinfo->size * 4));
 
-   /* Return an even number of verts.
-    * This prevents "parity" errors when splitting long triangle strips which
-    * can lead to front/back culling mix-ups.
-    * Every other triangle in a strip has an alternate front/back orientation
-    * so splitting at an odd position can cause the orientation of subsequent
-    * triangles to get reversed.
-    */
-   *max_vertices = *max_vertices & ~1;
-
    /* Probably need to do this somewhere (or fix exec shader not to
     * need it):
     */

src/gallium/auxiliary/draw/draw_pt_fetch_shade_pipeline.c

@@ -119,9 +119,6 @@ static void fetch_pipeline_prepare( struct draw_pt_middle_end *middle,
       *max_vertices = 4096;
    }
 
-   /* return even number */
-   *max_vertices = *max_vertices & ~1;
-
    /* No need to prepare the shader.
     */
    vs->prepare(vs, draw);

src/gallium/auxiliary/draw/draw_pt_fetch_shade_pipeline_llvm.c

@@ -125,9 +125,6 @@ llvm_middle_end_prepare( struct draw_pt_middle_end *middle,
       *max_vertices = 4096;
    }
 
-   /* return even number */
-   *max_vertices = *max_vertices & ~1;
-
    draw_llvm_make_variant_key(fpme->llvm, &key);
 
    li = first_elem(&shader->variants);