src/gallium/auxiliary/draw/draw_pt_varray.c

   1 /**************************************************************************
   2  *
   3  * Copyright 2008 Tungsten Graphics, Inc., Cedar Park, Texas.
   4  * All Rights Reserved.
   5  *
   6  * Permission is hereby granted, free of charge, to any person obtaining a
   7  * copy of this software and associated documentation files (the
   8  * "Software"), to deal in the Software without restriction, including
   9  * without limitation the rights to use, copy, modify, merge, publish,
  10  * distribute, sub license, and/or sell copies of the Software, and to
  11  * permit persons to whom the Software is furnished to do so, subject to
  12  * the following conditions:
  13  *
  14  * The above copyright notice and this permission notice (including the
  15  * next paragraph) shall be included in all copies or substantial portions
  16  * of the Software.
  17  *
  18  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  19  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  20  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
  21  * IN NO EVENT SHALL TUNGSTEN GRAPHICS AND/OR ITS SUPPLIERS BE LIABLE FOR
  22  * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
  23  * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
  24  * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  25  *
  26  **************************************************************************/
  27
  28 #include "util/u_math.h"
  29 #include "util/u_memory.h"
  30
  31 #include "draw/draw_context.h"
  32 #include "draw/draw_private.h"
  33 #include "draw/draw_pt.h"
  34
  35 #define FETCH_MAX 256
  36 #define DRAW_MAX (FETCH_MAX+8)
  37
  38 struct varray_frontend {
  39    struct draw_pt_front_end base;
  40    struct draw_context *draw;
  41
  42    ushort draw_elts[DRAW_MAX];
  43    unsigned fetch_elts[FETCH_MAX];
  44
  45    unsigned driver_fetch_max;
  46    unsigned fetch_max;
  47
  48    struct draw_pt_middle_end *middle;
  49
  50    unsigned input_prim;
  51    unsigned output_prim;
  52 };
  53
  54
  55 static void varray_flush_linear(struct varray_frontend *varray,
  56                                 unsigned start, unsigned count)
  57 {
  58    if (count) {
  59       assert(varray->middle->run_linear);
  60       varray->middle->run_linear(varray->middle, start, count);
  61    }
  62 }
  63
  64 static void varray_line_loop_segment(struct varray_frontend *varray,
  65                                      unsigned start,
  66                                      unsigned segment_start,
  67                                      unsigned segment_count,
  68                                      boolean end )
  69 {
  70    assert(segment_count < varray->fetch_max);
  71    if (segment_count >= 1) {
  72       unsigned nr = 0, i;
  73
  74       for (i = 0; i < segment_count; i++)
  75          varray->fetch_elts[nr++] = start + segment_start + i;
  76
  77       if (end)
  78          varray->fetch_elts[nr++] = start;
  79
  80       assert(nr <= FETCH_MAX);
  81
  82       varray->middle->run(varray->middle,
  83                           varray->fetch_elts,
  84                           nr,
  85                           varray->draw_elts, /* ie. linear */
  86                           nr);
  87    }
  88 }
  89
  90
  91
  92 static void varray_fan_segment(struct varray_frontend *varray,
  93                                unsigned start,
  94                                unsigned segment_start,
  95                                unsigned segment_count )
  96 {
  97    assert(segment_count < varray->fetch_max);
  98    if (segment_count >= 2) {
  99       unsigned nr = 0, i;
 100
 101       if (segment_start != 0)
 102          varray->fetch_elts[nr++] = start;
 103
 104       for (i = 0 ; i < segment_count; i++)
 105          varray->fetch_elts[nr++] = start + segment_start + i;
 106
 107       assert(nr <= FETCH_MAX);
 108
 109       varray->middle->run(varray->middle,
 110                           varray->fetch_elts,
 111                           nr,
 112                           varray->draw_elts, /* ie. linear */
 113                           nr);
 114    }
 115 }
 116
 117
 118
 119
 120 #define FUNC varray_run
 121 #include "draw_pt_varray_tmp_linear.h"
 122
 123 static unsigned decompose_prim[PIPE_PRIM_POLYGON + 1] = {
 124    PIPE_PRIM_POINTS,
 125    PIPE_PRIM_LINES,
 126    PIPE_PRIM_LINE_STRIP,        /* decomposed LINELOOP */
 127    PIPE_PRIM_LINE_STRIP,
 128    PIPE_PRIM_TRIANGLES,
 129    PIPE_PRIM_TRIANGLE_STRIP,
 130    PIPE_PRIM_TRIANGLE_FAN,
 131    PIPE_PRIM_QUADS,
 132    PIPE_PRIM_QUAD_STRIP,
 133    PIPE_PRIM_POLYGON
 134 };
 135
 136
 137
 138 static void varray_prepare(struct draw_pt_front_end *frontend,
 139                            unsigned in_prim,
 140                            unsigned out_prim,
 141                            struct draw_pt_middle_end *middle,
 142                            unsigned opt)
 143 {
 144    struct varray_frontend *varray = (struct varray_frontend *)frontend;
 145
 146    varray->base.run = varray_run;
 147
 148    varray->input_prim = in_prim;
 149    varray->output_prim = decompose_prim[out_prim];
 150
 151    varray->middle = middle;
 152    middle->prepare(middle, varray->input_prim,
 153                    varray->output_prim, opt, &varray->driver_fetch_max );
 154
 155    /* check that the max is even */
 156    assert((varray->driver_fetch_max & 1) == 0);
 157
 158    varray->fetch_max = MIN2(FETCH_MAX, varray->driver_fetch_max);
 159 }
 160
 161
 162
 163
 164 static void varray_finish(struct draw_pt_front_end *frontend)
 165 {
 166    struct varray_frontend *varray = (struct varray_frontend *)frontend;
 167    varray->middle->finish(varray->middle);
 168    varray->middle = NULL;
 169 }
 170
 171 static void varray_destroy(struct draw_pt_front_end *frontend)
 172 {
 173    FREE(frontend);
 174 }
 175
 176
 177 struct draw_pt_front_end *draw_pt_varray(struct draw_context *draw)
 178 {
 179    ushort i;
 180    struct varray_frontend *varray = CALLOC_STRUCT(varray_frontend);
 181    if (varray == NULL)
 182       return NULL;
 183
 184    varray->base.prepare = varray_prepare;
 185    varray->base.run     = NULL;
 186    varray->base.finish  = varray_finish;
 187    varray->base.destroy = varray_destroy;
 188    varray->draw = draw;
 189
 190    for (i = 0; i < DRAW_MAX; i++) {
 191       varray->draw_elts[i] = i;
 192    }
 193
 194    return &varray->base;
 195 }