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 "util/u_inlines.h"
  27 #include "util/u_upload_mgr.h"
  28 #include "indices/u_indices.h"
  29
  30 #include "svga_cmd.h"
  31 #include "svga_draw.h"
  32 #include "svga_draw_private.h"
  33 #include "svga_resource_buffer.h"
  34 #include "svga_winsys.h"
  35 #include "svga_context.h"
  36
  37 #include "svga_hw_reg.h"
  38
  39
  40 static enum pipe_error
  41 translate_indices( struct svga_hwtnl *hwtnl,
  42                    struct pipe_resource *src,
  43                    unsigned offset,
  44                    unsigned nr,
  45                    unsigned index_size,
  46                    u_translate_func translate,
  47                    struct pipe_resource **out_buf )
  48 {
  49    struct pipe_context *pipe = &hwtnl->svga->pipe;
  50    struct pipe_transfer *src_transfer = NULL;
  51    struct pipe_transfer *dst_transfer = NULL;
  52    unsigned size = index_size * nr;
  53    const void *src_map = NULL;
  54    struct pipe_resource *dst = NULL;
  55    void *dst_map = NULL;
  56
  57    dst = pipe_buffer_create( pipe->screen,
  58                              PIPE_BIND_INDEX_BUFFER,
  59                              PIPE_USAGE_STATIC,
  60                              size );
  61    if (dst == NULL)
  62       goto fail;
  63
  64    src_map = pipe_buffer_map( pipe, src, PIPE_TRANSFER_READ, &src_transfer );
  65    if (src_map == NULL)
  66       goto fail;
  67
  68    dst_map = pipe_buffer_map( pipe, dst, PIPE_TRANSFER_WRITE, &dst_transfer );
  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( pipe, src_transfer );
  77    pipe_buffer_unmap( pipe, dst_transfer );
  78
  79    *out_buf = dst;
  80    return PIPE_OK;
  81
  82 fail:
  83    if (src_map)
  84       pipe_buffer_unmap( pipe, src_transfer );
  85
  86    if (dst_map)
  87       pipe_buffer_unmap( pipe, dst_transfer );
  88
  89    if (dst)
  90       pipe->screen->resource_destroy( pipe->screen, 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_resource *index_buffer,
 102                                        unsigned index_size,
 103                                        int index_bias,
 104                                        unsigned min_index,
 105                                        unsigned max_index,
 106                                        unsigned prim,
 107                                        unsigned start,
 108                                        unsigned count )
 109 {
 110    struct pipe_resource *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       boolean flushed;
 125       assert( index_buffer->width0 >= index_offset + count * index_size );
 126
 127       ret = u_upload_buffer( hwtnl->upload_ib,
 128                              0,
 129                              index_offset,
 130                              count * index_size,
 131                              index_buffer,
 132                              &index_offset,
 133                              &upload_buffer,
 134                              &flushed );
 135       if (ret)
 136          goto done;
 137
 138       /* Don't need to worry about refcounting index_buffer as this is
 139        * just a stack variable without a counted reference of its own.
 140        * The caller holds the reference.
 141        */
 142       index_buffer = upload_buffer;
 143    }
 144
 145    range.primType = hw_prim;
 146    range.primitiveCount = hw_count;
 147    range.indexArray.offset = index_offset;
 148    range.indexArray.stride = index_size;
 149    range.indexWidth = index_size;
 150    range.indexBias = index_bias;
 151
 152    ret = svga_hwtnl_prim( hwtnl, &range, min_index, max_index, index_buffer );
 153    if (ret)
 154       goto done;
 155
 156 done:
 157    if (upload_buffer)
 158       pipe_resource_reference( &upload_buffer, NULL );
 159
 160    return ret;
 161 }
 162
 163
 164
 165
 166 enum pipe_error
 167 svga_hwtnl_draw_range_elements( struct svga_hwtnl *hwtnl,
 168                                 struct pipe_resource *index_buffer,
 169                                 unsigned index_size,
 170                                 int index_bias,
 171                                 unsigned min_index,
 172                                 unsigned max_index,
 173                                 unsigned prim, unsigned start, unsigned count)
 174 {
 175    unsigned gen_prim, gen_size, gen_nr, gen_type;
 176    u_translate_func gen_func;
 177    enum pipe_error ret = PIPE_OK;
 178
 179    if (hwtnl->api_fillmode != PIPE_POLYGON_MODE_FILL &&
 180        prim >= PIPE_PRIM_TRIANGLES)
 181    {
 182       gen_type = u_unfilled_translator( prim,
 183                                         index_size,
 184                                         count,
 185                                         hwtnl->api_fillmode,
 186                                         &gen_prim,
 187                                         &gen_size,
 188                                         &gen_nr,
 189                                         &gen_func );
 190    }
 191    else
 192    {
 193       gen_type = u_index_translator( svga_hw_prims,
 194                                      prim,
 195                                      index_size,
 196                                      count,
 197                                      hwtnl->api_pv,
 198                                      hwtnl->hw_pv,
 199                                      &gen_prim,
 200                                      &gen_size,
 201                                      &gen_nr,
 202                                      &gen_func );
 203    }
 204
 205
 206    if (gen_type == U_TRANSLATE_MEMCPY) {
 207       /* No need for translation, just pass through to hardware:
 208        */
 209       return svga_hwtnl_simple_draw_range_elements( hwtnl, index_buffer,
 210                                                     index_size,
 211                                                     index_bias,
 212                                                     min_index,
 213                                                     max_index,
 214                                                     gen_prim, start, count );
 215    }
 216    else {
 217       struct pipe_resource *gen_buf = NULL;
 218
 219       /* Need to allocate a new index buffer and run the translate
 220        * func to populate it.  Could potentially cache this translated
 221        * index buffer with the original to avoid future
 222        * re-translations.  Not much point if we're just accelerating
 223        * GL though, as index buffers are typically used only once
 224        * there.
 225        */
 226       ret = translate_indices( hwtnl,
 227                                index_buffer,
 228                                start * index_size,
 229                                gen_nr,
 230                                gen_size,
 231                                gen_func,
 232                                &gen_buf );
 233       if (ret)
 234          goto done;
 235
 236       ret = svga_hwtnl_simple_draw_range_elements( hwtnl,
 237                                                    gen_buf,
 238                                                    gen_size,
 239                                                    index_bias,
 240                                                    min_index,
 241                                                    max_index,
 242                                                    gen_prim,
 243                                                    0,
 244                                                    gen_nr );
 245       if (ret)
 246          goto done;
 247
 248    done:
 249       if (gen_buf)
 250          pipe_resource_reference( &gen_buf, NULL );
 251
 252       return ret;
 253    }
 254 }
 255
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