src/gallium/drivers/svga/svga_draw_arrays.c

   1 /**********************************************************
   2  * Copyright 2008-2009 VMware, Inc.  All rights reserved.
   3  *
   4  * Permission is hereby granted, free of charge, to any person
   5  * obtaining a copy of this software and associated documentation
   6  * files (the "Software"), to deal in the Software without
   7  * restriction, including without limitation the rights to use, copy,
   8  * modify, merge, publish, distribute, sublicense, and/or sell copies
   9  * of the Software, and to permit persons to whom the Software is
  10  * furnished to do so, subject to the following conditions:
  11  *
  12  * The above copyright notice and this permission notice shall be
  13  * included in all copies or substantial portions of the Software.
  14  *
  15  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  16  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  17  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  18  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
  19  * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
  20  * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  21  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  22  * SOFTWARE.
  23  *
  24  **********************************************************/
  25
  26 #include "svga_cmd.h"
  27
  28 #include "util/u_inlines.h"
  29 #include "indices/u_indices.h"
  30
  31 #include "svga_hw_reg.h"
  32 #include "svga_draw.h"
  33 #include "svga_draw_private.h"
  34 #include "svga_context.h"
  35
  36
  37 #define DBG 0
  38
  39
  40
  41
  42 static enum pipe_error generate_indices( struct svga_hwtnl *hwtnl,
  43                                          unsigned nr,
  44                                          unsigned index_size,
  45                                          u_generate_func generate,
  46                                          struct pipe_buffer **out_buf )
  47 {
  48    struct pipe_screen *screen = hwtnl->svga->pipe.screen;
  49    unsigned size = index_size * nr;
  50    struct pipe_buffer *dst = NULL;
  51    void *dst_map = NULL;
  52
  53    dst = screen->buffer_create( screen, 32,
  54                                 PIPE_BUFFER_USAGE_INDEX |
  55                                 PIPE_BUFFER_USAGE_CPU_WRITE |
  56                                 PIPE_BUFFER_USAGE_GPU_READ,
  57                                 size );
  58    if (dst == NULL)
  59       goto fail;
  60
  61    dst_map = pipe_buffer_map( screen, dst, PIPE_BUFFER_USAGE_CPU_WRITE );
  62    if (dst_map == NULL)
  63       goto fail;
  64
  65    generate( nr,
  66              dst_map );
  67
  68    pipe_buffer_unmap( screen, dst );
  69
  70    *out_buf = dst;
  71    return PIPE_OK;
  72
  73 fail:
  74    if (dst_map)
  75       screen->buffer_unmap( screen, dst );
  76
  77    if (dst)
  78       screen->buffer_destroy( dst );
  79
  80    return PIPE_ERROR_OUT_OF_MEMORY;
  81 }
  82
  83 static boolean compare( unsigned cached_nr,
  84                         unsigned nr,
  85                         unsigned type )
  86 {
  87    if (type == U_GENERATE_REUSABLE)
  88       return cached_nr >= nr;
  89    else
  90       return cached_nr == nr;
  91 }
  92
  93 static enum pipe_error retrieve_or_generate_indices( struct svga_hwtnl *hwtnl,
  94                                                      unsigned prim,
  95                                                      unsigned gen_type,
  96                                                      unsigned gen_nr,
  97                                                      unsigned gen_size,
  98                                                      u_generate_func generate,
  99                                                      struct pipe_buffer **out_buf )
 100 {
 101    enum pipe_error ret = PIPE_OK;
 102    int i;
 103
 104    for (i = 0; i < IDX_CACHE_MAX; i++) {
 105       if (hwtnl->index_cache[prim][i].buffer != NULL &&
 106           hwtnl->index_cache[prim][i].generate == generate)
 107       {
 108          if (compare(hwtnl->index_cache[prim][i].gen_nr, gen_nr, gen_type))
 109          {
 110             pipe_buffer_reference( out_buf,
 111                                    hwtnl->index_cache[prim][i].buffer );
 112
 113             if (DBG)
 114                debug_printf("%s retrieve %d/%d\n", __FUNCTION__, i, gen_nr);
 115
 116             return PIPE_OK;
 117          }
 118          else if (gen_type == U_GENERATE_REUSABLE)
 119          {
 120             pipe_buffer_reference( &hwtnl->index_cache[prim][i].buffer,
 121                                    NULL );
 122
 123             if (DBG)
 124                debug_printf("%s discard %d/%d\n", __FUNCTION__,
 125                             i, hwtnl->index_cache[prim][i].gen_nr);
 126
 127             break;
 128          }
 129       }
 130    }
 131
 132    if (i == IDX_CACHE_MAX)
 133    {
 134       unsigned smallest = 0;
 135       unsigned smallest_size = ~0;
 136
 137       for (i = 0; i < IDX_CACHE_MAX && smallest_size; i++) {
 138          if (hwtnl->index_cache[prim][i].buffer == NULL)
 139          {
 140             smallest = i;
 141             smallest_size = 0;
 142          }
 143          else if (hwtnl->index_cache[prim][i].gen_nr < smallest)
 144          {
 145             smallest = i;
 146             smallest_size = hwtnl->index_cache[prim][i].gen_nr;
 147          }
 148       }
 149
 150       assert (smallest != IDX_CACHE_MAX);
 151
 152       pipe_buffer_reference( &hwtnl->index_cache[prim][smallest].buffer,
 153                              NULL );
 154
 155       if (DBG)
 156          debug_printf("%s discard smallest %d/%d\n", __FUNCTION__,
 157                       smallest, smallest_size);
 158
 159       i = smallest;
 160    }
 161
 162
 163    ret = generate_indices( hwtnl,
 164                            gen_nr,
 165                            gen_size,
 166                            generate,
 167                            out_buf );
 168    if (ret != PIPE_OK)
 169       return ret;
 170
 171
 172    hwtnl->index_cache[prim][i].generate = generate;
 173    hwtnl->index_cache[prim][i].gen_nr = gen_nr;
 174    pipe_buffer_reference( &hwtnl->index_cache[prim][i].buffer,
 175                           *out_buf );
 176
 177    if (DBG)
 178       debug_printf("%s cache %d/%d\n", __FUNCTION__,
 179                    i, hwtnl->index_cache[prim][i].gen_nr);
 180
 181    return PIPE_OK;
 182 }
 183
 184
 185
 186 static enum pipe_error
 187 simple_draw_arrays( struct svga_hwtnl *hwtnl,
 188                     unsigned prim, unsigned start, unsigned count )
 189 {
 190    SVGA3dPrimitiveRange range;
 191    unsigned hw_prim;
 192    unsigned hw_count;
 193
 194    hw_prim = svga_translate_prim(prim, count, &hw_count);
 195    if (hw_count == 0)
 196       return PIPE_ERROR_BAD_INPUT;
 197
 198    range.primType = hw_prim;
 199    range.primitiveCount = hw_count;
 200    range.indexArray.surfaceId = SVGA3D_INVALID_ID;
 201    range.indexArray.offset = 0;
 202    range.indexArray.stride = 0;
 203    range.indexWidth = 0;
 204    range.indexBias = start;
 205
 206    /* Min/max index should be calculated prior to applying bias, so we
 207     * end up with min_index = 0, max_index = count - 1 and everybody
 208     * looking at those numbers knows to adjust them by
 209     * range.indexBias.
 210     */
 211    return svga_hwtnl_prim( hwtnl, &range, 0, count - 1, NULL );
 212 }
 213
 214
 215
 216
 217
 218
 219
 220
 221
 222
 223 enum pipe_error
 224 svga_hwtnl_draw_arrays( struct svga_hwtnl *hwtnl,
 225                         unsigned prim,
 226                         unsigned start,
 227                         unsigned count)
 228 {
 229    unsigned gen_prim, gen_size, gen_nr, gen_type;
 230    u_generate_func gen_func;
 231    enum pipe_error ret = PIPE_OK;
 232
 233    if (hwtnl->api_fillmode != PIPE_POLYGON_MODE_FILL &&
 234        prim >= PIPE_PRIM_TRIANGLES)
 235    {
 236       gen_type = u_unfilled_generator( prim,
 237                                        start,
 238                                        count,
 239                                        hwtnl->api_fillmode,
 240                                        &gen_prim,
 241                                        &gen_size,
 242                                        &gen_nr,
 243                                        &gen_func );
 244    }
 245    else {
 246       gen_type = u_index_generator( svga_hw_prims,
 247                                     prim,
 248                                     start,
 249                                     count,
 250                                     hwtnl->api_pv,
 251                                     hwtnl->hw_pv,
 252                                     &gen_prim,
 253                                     &gen_size,
 254                                     &gen_nr,
 255                                     &gen_func );
 256    }
 257
 258    if (gen_type == U_GENERATE_LINEAR) {
 259       return simple_draw_arrays( hwtnl, gen_prim, start, count );
 260    }
 261    else {
 262       struct pipe_buffer *gen_buf = NULL;
 263
 264       /* Need to draw as indexed primitive.
 265        * Potentially need to run the gen func to build an index buffer.
 266        */
 267       ret = retrieve_or_generate_indices( hwtnl,
 268                                           prim,
 269                                           gen_type,
 270                                           gen_nr,
 271                                           gen_size,
 272                                           gen_func,
 273                                           &gen_buf );
 274       if (ret)
 275          goto done;
 276
 277       ret = svga_hwtnl_simple_draw_range_elements( hwtnl,
 278                                                    gen_buf,
 279                                                    gen_size,
 280                                                    0,
 281                                                    count - 1,
 282                                                    gen_prim,
 283                                                    0,
 284                                                    gen_nr,
 285                                                    start );
 286       if (ret)
 287          goto done;
 288
 289    done:
 290       if (gen_buf)
 291          pipe_buffer_reference( &gen_buf, NULL );
 292
 293       return ret;
 294    }
 295 }
 296