src/gallium/drivers/svga/svga_draw_elements.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 "pipe/p_inlines.h"
  27 #include "util/u_prim.h"
  28 #include "util/u_upload_mgr.h"
  29 #include "indices/u_indices.h"
  30
  31 #include "svga_cmd.h"
  32 #include "svga_draw.h"
  33 #include "svga_draw_private.h"
  34 #include "svga_screen_buffer.h"
  35 #include "svga_winsys.h"
  36 #include "svga_context.h"
  37
  38 #include "svga_hw_reg.h"
  39
  40
  41 static enum pipe_error
  42 translate_indices( struct svga_hwtnl *hwtnl,
  43                    struct pipe_buffer *src,
  44                    unsigned offset,
  45                    unsigned nr,
  46                    unsigned index_size,
  47                    u_translate_func translate,
  48                    struct pipe_buffer **out_buf )
  49 {
  50    struct pipe_screen *screen = hwtnl->svga->pipe.screen;
  51    unsigned size = index_size * nr;
  52    const void *src_map = NULL;
  53    struct pipe_buffer *dst = NULL;
  54    void *dst_map = NULL;
  55
  56    dst = screen->buffer_create( screen, 32,
  57                                 PIPE_BUFFER_USAGE_INDEX |
  58                                 PIPE_BUFFER_USAGE_CPU_WRITE |
  59                                 PIPE_BUFFER_USAGE_GPU_READ,
  60                                 size );
  61    if (dst == NULL)
  62       goto fail;
  63
  64    src_map = pipe_buffer_map( screen, src, PIPE_BUFFER_USAGE_CPU_READ );
  65    if (src_map == NULL)
  66       goto fail;
  67
  68    dst_map = pipe_buffer_map( screen, dst, PIPE_BUFFER_USAGE_CPU_WRITE );
  69    if (dst_map == NULL)
  70       goto fail;
  71
  72    translate( (const char *)src_map + offset,
  73               nr,
  74               dst_map );
  75
  76    pipe_buffer_unmap( screen, src );
  77    pipe_buffer_unmap( screen, dst );
  78
  79    *out_buf = dst;
  80    return PIPE_OK;
  81
  82 fail:
  83    if (src_map)
  84       screen->buffer_unmap( screen, src );
  85
  86    if (dst_map)
  87       screen->buffer_unmap( screen, dst );
  88
  89    if (dst)
  90       screen->buffer_destroy( dst );
  91
  92    return PIPE_ERROR_OUT_OF_MEMORY;
  93 }
  94
  95
  96
  97
  98
  99 enum pipe_error
 100 svga_hwtnl_simple_draw_range_elements( struct svga_hwtnl *hwtnl,
 101                                        struct pipe_buffer *index_buffer,
 102                                        unsigned index_size,
 103                                        unsigned min_index,
 104                                        unsigned max_index,
 105                                        unsigned prim,
 106                                        unsigned start,
 107                                        unsigned count,
 108                                        unsigned bias )
 109 {
 110    struct pipe_buffer *upload_buffer = NULL;
 111    SVGA3dPrimitiveRange range;
 112    unsigned hw_prim;
 113    unsigned hw_count;
 114    unsigned index_offset = start * index_size;
 115    int ret = PIPE_OK;
 116
 117    hw_prim = svga_translate_prim(prim, count, &hw_count);
 118    if (hw_count == 0)
 119       goto done;
 120
 121    if (index_buffer &&
 122        svga_buffer_is_user_buffer(index_buffer))
 123    {
 124       assert( index_buffer->size >= index_offset + count * index_size );
 125
 126       ret = u_upload_buffer( hwtnl->upload_ib,
 127                              index_offset,
 128                              count * index_size,
 129                              index_buffer,
 130                              &index_offset,
 131                              &upload_buffer );
 132       if (ret)
 133          goto done;
 134
 135       /* Don't need to worry about refcounting index_buffer as this is
 136        * just a stack variable without a counted reference of its own.
 137        * The caller holds the reference.
 138        */
 139       index_buffer = upload_buffer;
 140    }
 141
 142    range.primType = hw_prim;
 143    range.primitiveCount = hw_count;
 144    range.indexArray.offset = index_offset;
 145    range.indexArray.stride = index_size;
 146    range.indexWidth = index_size;
 147    range.indexBias = bias;
 148
 149    ret = svga_hwtnl_prim( hwtnl, &range, min_index, max_index, index_buffer );
 150    if (ret)
 151       goto done;
 152
 153 done:
 154    if (upload_buffer)
 155       pipe_buffer_reference( &upload_buffer, NULL );
 156
 157    return ret;
 158 }
 159
 160
 161
 162
 163 enum pipe_error
 164 svga_hwtnl_draw_range_elements( struct svga_hwtnl *hwtnl,
 165                                 struct pipe_buffer *index_buffer,
 166                                 unsigned index_size,
 167                                 unsigned min_index,
 168                                 unsigned max_index,
 169                                 unsigned prim, unsigned start, unsigned count,
 170                                 unsigned bias)
 171 {
 172    unsigned gen_prim, gen_size, gen_nr, gen_type;
 173    u_translate_func gen_func;
 174    enum pipe_error ret = PIPE_OK;
 175
 176    if (hwtnl->api_fillmode != PIPE_POLYGON_MODE_FILL &&
 177        prim >= PIPE_PRIM_TRIANGLES)
 178    {
 179       gen_type = u_unfilled_translator( prim,
 180                                         index_size,
 181                                         count,
 182                                         hwtnl->api_fillmode,
 183                                         &gen_prim,
 184                                         &gen_size,
 185                                         &gen_nr,
 186                                         &gen_func );
 187    }
 188    else
 189    {
 190       gen_type = u_index_translator( svga_hw_prims,
 191                                      prim,
 192                                      index_size,
 193                                      count,
 194                                      hwtnl->api_pv,
 195                                      hwtnl->hw_pv,
 196                                      &gen_prim,
 197                                      &gen_size,
 198                                      &gen_nr,
 199                                      &gen_func );
 200    }
 201
 202
 203    if (gen_type == U_TRANSLATE_MEMCPY) {
 204       /* No need for translation, just pass through to hardware:
 205        */
 206       return svga_hwtnl_simple_draw_range_elements( hwtnl, index_buffer,
 207                                                     index_size,
 208                                                     min_index,
 209                                                     max_index,
 210                                                     gen_prim, start, count, bias );
 211    }
 212    else {
 213       struct pipe_buffer *gen_buf = NULL;
 214
 215       /* Need to allocate a new index buffer and run the translate
 216        * func to populate it.  Could potentially cache this translated
 217        * index buffer with the original to avoid future
 218        * re-translations.  Not much point if we're just accelerating
 219        * GL though, as index buffers are typically used only once
 220        * there.
 221        */
 222       ret = translate_indices( hwtnl,
 223                                index_buffer,
 224                                start * index_size,
 225                                gen_nr,
 226                                gen_size,
 227                                gen_func,
 228                                &gen_buf );
 229       if (ret)
 230          goto done;
 231
 232       ret = svga_hwtnl_simple_draw_range_elements( hwtnl,
 233                                                    gen_buf,
 234                                                    gen_size,
 235                                                    min_index,
 236                                                    max_index,
 237                                                    gen_prim,
 238                                                    0,
 239                                                    gen_nr,
 240                                                    bias );
 241       if (ret)
 242          goto done;
 243
 244    done:
 245       if (gen_buf)
 246          pipe_buffer_reference( &gen_buf, NULL );
 247
 248       return ret;
 249    }
 250 }
 251
 252
 253
 254
 255