src/gallium/auxiliary/draw/draw_pt_varray_tmp_linear.h

   1 static unsigned trim( unsigned count, unsigned first, unsigned incr )
   2 {
   3    return count - (count - first) % incr;
   4 }
   5
   6 static void FUNC(struct draw_pt_front_end *frontend,
   7                  pt_elt_func get_elt,
   8                  const void *elts,
   9                  unsigned count)
  10 {
  11    struct varray_frontend *varray = (struct varray_frontend *)frontend;
  12    unsigned start = (unsigned)elts;
  13
  14    unsigned j;
  15    unsigned first, incr;
  16
  17    draw_pt_split_prim(varray->input_prim, &first, &incr);
  18
  19    /* Sanitize primitive length:
  20     */
  21    count = trim(count, first, incr);
  22    if (count < first)
  23       return;
  24
  25 #if 0
  26    debug_printf("%s (%d) %d/%d\n", __FUNCTION__,
  27                 varray->input_prim,
  28                 start, count);
  29 #endif
  30
  31    switch (varray->input_prim) {
  32    case PIPE_PRIM_POINTS:
  33    case PIPE_PRIM_LINES:
  34    case PIPE_PRIM_TRIANGLES:
  35    case PIPE_PRIM_LINE_STRIP:
  36    case PIPE_PRIM_TRIANGLE_STRIP:
  37    case PIPE_PRIM_QUADS:
  38    case PIPE_PRIM_QUAD_STRIP:
  39       for (j = 0; j < count;) {
  40          unsigned remaining = count - j;
  41          unsigned nr = trim( MIN2(varray->driver_fetch_max, remaining), first, incr );
  42          varray_flush_linear(varray, start + j, nr);
  43          j += nr;
  44          if (nr != remaining)
  45             j -= (first - incr);
  46       }
  47       break;
  48
  49    case PIPE_PRIM_LINE_LOOP:
  50       /* Always have to decompose as we've stated that this will be
  51        * emitted as a line-strip.
  52        */
  53       for (j = 0; j < count;) {
  54          unsigned remaining = count - j;
  55          unsigned nr = trim( MIN2(varray->fetch_max-1, remaining), first, incr );
  56          varray_line_loop_segment(varray, start, j, nr, nr == remaining);
  57          j += nr;
  58          if (nr != remaining)
  59             j -= (first - incr);
  60       }
  61       break;
  62
  63
  64    case PIPE_PRIM_POLYGON:
  65    case PIPE_PRIM_TRIANGLE_FAN:
  66       if (count < varray->driver_fetch_max) {
  67          varray_flush_linear(varray, start, count);
  68       }
  69       else {
  70          for ( j = 0; j < count;) {
  71             unsigned remaining = count - j;
  72             unsigned nr = trim( MIN2(varray->fetch_max-1, remaining), first, incr );
  73             varray_fan_segment(varray, start, j, nr);
  74             j += nr;
  75             if (nr != remaining)
  76                j -= (first - incr);
  77          }
  78       }
  79       break;
  80
  81    default:
  82       assert(0);
  83       break;
  84    }
  85 }
  86
  87 #undef TRIANGLE
  88 #undef QUAD
  89 #undef POINT
  90 #undef LINE
  91 #undef FUNC