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) ((char *) elts - (char *) NULL);
  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    case PIPE_PRIM_LINES_ADJACENCY:
  40    case PIPE_PRIM_LINE_STRIP_ADJACENCY:
  41    case PIPE_PRIM_TRIANGLES_ADJACENCY:
  42    case PIPE_PRIM_TRIANGLE_STRIP_ADJACENCY:
  43       for (j = 0; j < count;) {
  44          unsigned remaining = count - j;
  45          unsigned nr = trim( MIN2(varray->driver_fetch_max, remaining), first, incr );
  46          varray_flush_linear(varray, start + j, nr);
  47          j += nr;
  48          if (nr != remaining)
  49             j -= (first - incr);
  50       }
  51       break;
  52
  53    case PIPE_PRIM_LINE_LOOP:
  54       /* Always have to decompose as we've stated that this will be
  55        * emitted as a line-strip.
  56        */
  57       for (j = 0; j < count;) {
  58          unsigned remaining = count - j;
  59          unsigned nr = trim( MIN2(varray->fetch_max-1, remaining), first, incr );
  60          varray_line_loop_segment(varray, start, j, nr, nr == remaining);
  61          j += nr;
  62          if (nr != remaining)
  63             j -= (first - incr);
  64       }
  65       break;
  66
  67
  68    case PIPE_PRIM_POLYGON:
  69    case PIPE_PRIM_TRIANGLE_FAN:
  70       if (count < varray->driver_fetch_max) {
  71          varray_flush_linear(varray, start, count);
  72       }
  73       else {
  74          for ( j = 0; j < count;) {
  75             unsigned remaining = count - j;
  76             unsigned nr = trim( MIN2(varray->fetch_max-1, remaining), first, incr );
  77             varray_fan_segment(varray, start, j, nr);
  78             j += nr;
  79             if (nr != remaining)
  80                j -= (first - incr);
  81          }
  82       }
  83       break;
  84
  85    default:
  86       assert(0);
  87       break;
  88    }
  89 }
  90
  91 #undef TRIANGLE
  92 #undef QUAD
  93 #undef POINT
  94 #undef LINE
  95 #undef FUNC