src/gallium/drivers/svga/svga_draw_elements.c

   1 /**********************************************************
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  13  * included in all copies or substantial portions of the Software.
  14  *
  15  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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  17  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  18  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
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  22  * SOFTWARE.
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  24  **********************************************************/
  25
  26 #include "indices/u_indices.h"
  27 #include "util/u_inlines.h"
  28 #include "util/u_prim.h"
  29 #include "util/u_upload_mgr.h"
  30
  31 #include "svga_cmd.h"
  32 #include "svga_draw.h"
  33 #include "svga_draw_private.h"
  34 #include "svga_resource_buffer.h"
  35 #include "svga_winsys.h"
  36 #include "svga_context.h"
  37 #include "svga_hw_reg.h"
  38
  39
  40 /**
  41  * Return a new index buffer which contains a translation of the original
  42  * index buffer.  An example of a translation is converting from QUAD
  43  * primitives to TRIANGLE primitives.  Each set of four indexes for a quad
  44  * will be converted to six indices for two triangles.
  45  *
  46  * Before generating the new index buffer we'll check if the incoming
  47  * buffer already has a translated buffer that can be re-used.
  48  * This benefits demos like Cinebench R15 which has many
  49  * glDrawElements(GL_QUADS) commands (we can't draw quads natively).
  50  *
  51  * \param offset  offset in bytes to first index to translate in src buffer
  52  * \param orig_prim  original primitive type (like PIPE_PRIM_QUADS)
  53  * \param gen_prim  new/generated primitive type (like PIPE_PRIM_TRIANGLES)
  54  * \param orig_nr  number of indexes to translate in source buffer
  55  * \param gen_nr  number of indexes to write into new/dest buffer
  56  * \param index_size  bytes per index (2 or 4)
  57  * \param translate  the translation function from the u_translate module
  58  * \param out_buf  returns the new/translated index buffer
  59  * \return error code to indicate success failure
  60  */
  61 static enum pipe_error
  62 translate_indices(struct svga_hwtnl *hwtnl,
  63                   const struct pipe_draw_info *info,
  64                   const struct pipe_draw_start_count_bias *draw,
  65                   enum pipe_prim_type gen_prim,
  66                   unsigned orig_nr, unsigned gen_nr,
  67                   unsigned gen_size,
  68                   u_translate_func translate,
  69                   struct pipe_resource **out_buf,
  70                   unsigned *out_offset)
  71 {
  72    struct pipe_context *pipe = &hwtnl->svga->pipe;
  73    struct svga_screen *screen = svga_screen(pipe->screen);
  74    struct svga_buffer *src_sbuf = NULL;
  75    struct pipe_transfer *src_transfer = NULL;
  76    struct pipe_transfer *dst_transfer = NULL;
  77    const unsigned size = gen_size * gen_nr;
  78    const unsigned offset = draw->start * info->index_size;
  79    const void *src_map = NULL;
  80    struct pipe_resource *dst = NULL;
  81    void *dst_map = NULL;
  82
  83    assert(gen_size == 2 || gen_size == 4);
  84    if (!info->has_user_indices)
  85       src_sbuf = svga_buffer(info->index.resource);
  86
  87    /* If the draw_info provides us with a buffer rather than a
  88     * user pointer, Check to see if we've already translated that buffer
  89     */
  90    if (src_sbuf && !screen->debug.no_cache_index_buffers) {
  91       /* Check if we already have a translated index buffer */
  92       if (src_sbuf->translated_indices.buffer &&
  93           src_sbuf->translated_indices.orig_prim == info->mode &&
  94           src_sbuf->translated_indices.new_prim == gen_prim &&
  95           src_sbuf->translated_indices.offset == offset &&
  96           src_sbuf->translated_indices.count == orig_nr &&
  97           src_sbuf->translated_indices.index_size == gen_size) {
  98          pipe_resource_reference(out_buf, src_sbuf->translated_indices.buffer);
  99          return PIPE_OK;
 100       }
 101    }
 102
 103    /* Need to trim vertex count to make sure we don't write too much data
 104     * to the dst buffer in the translate() call.
 105     */
 106    u_trim_pipe_prim(gen_prim, &gen_nr);
 107
 108    if (src_sbuf) {
 109       /* If we have a source buffer, create a destination buffer in the
 110        * hope that we can reuse the translated data later. If not,
 111        * we'd probably be better off using the upload buffer.
 112        */
 113       dst = pipe_buffer_create(pipe->screen,
 114                                PIPE_BIND_INDEX_BUFFER, PIPE_USAGE_IMMUTABLE,
 115                                size);
 116       if (!dst)
 117          goto fail;
 118
 119       dst_map = pipe_buffer_map(pipe, dst, PIPE_MAP_WRITE, &dst_transfer);
 120       if (!dst_map)
 121          goto fail;
 122
 123       *out_offset = 0;
 124       src_map = pipe_buffer_map(pipe, info->index.resource,
 125                                 PIPE_MAP_READ |
 126                                 PIPE_MAP_UNSYNCHRONIZED,
 127                                 &src_transfer);
 128       if (!src_map)
 129          goto fail;
 130    } else {
 131       /* Allocate upload buffer space. Align to the index size. */
 132       u_upload_alloc(pipe->stream_uploader, 0, size, gen_size,
 133                      out_offset, &dst, &dst_map);
 134       if (!dst)
 135          goto fail;
 136
 137       src_map = info->index.user;
 138    }
 139
 140    translate((const char *) src_map + offset, 0, 0, gen_nr, 0, dst_map);
 141
 142    if (src_transfer)
 143       pipe_buffer_unmap(pipe, src_transfer);
 144
 145    if (dst_transfer)
 146       pipe_buffer_unmap(pipe, dst_transfer);
 147    else
 148       u_upload_unmap(pipe->stream_uploader);
 149
 150    *out_buf = dst;
 151
 152    if (src_sbuf && !screen->debug.no_cache_index_buffers) {
 153       /* Save the new, translated index buffer in the hope we can use it
 154        * again in the future.
 155        */
 156       pipe_resource_reference(&src_sbuf->translated_indices.buffer, dst);
 157       src_sbuf->translated_indices.orig_prim = info->mode;
 158       src_sbuf->translated_indices.new_prim = gen_prim;
 159       src_sbuf->translated_indices.offset = offset;
 160       src_sbuf->translated_indices.count = orig_nr;
 161       src_sbuf->translated_indices.index_size = gen_size;
 162    }
 163
 164    return PIPE_OK;
 165
 166  fail:
 167    if (src_transfer)
 168       pipe_buffer_unmap(pipe, src_transfer);
 169
 170    if (dst_transfer)
 171       pipe_buffer_unmap(pipe, dst_transfer);
 172    else if (dst_map)
 173       u_upload_unmap(pipe->stream_uploader);
 174
 175    if (dst)
 176       pipe_resource_reference(&dst, NULL);
 177
 178    return PIPE_ERROR_OUT_OF_MEMORY;
 179 }
 180
 181
 182 enum pipe_error
 183 svga_hwtnl_simple_draw_range_elements(struct svga_hwtnl *hwtnl,
 184                                       struct pipe_resource *index_buffer,
 185                                       unsigned index_size, int index_bias,
 186                                       unsigned min_index, unsigned max_index,
 187                                       enum pipe_prim_type prim, unsigned start,
 188                                       unsigned count,
 189                                       unsigned start_instance,
 190                                       unsigned instance_count,
 191                                       ubyte vertices_per_patch)
 192 {
 193    SVGA3dPrimitiveRange range;
 194    unsigned hw_prim;
 195    unsigned hw_count;
 196    unsigned index_offset = start * index_size;
 197
 198    hw_prim = svga_translate_prim(prim, count, &hw_count, vertices_per_patch);
 199    if (hw_count == 0)
 200       return PIPE_OK; /* nothing to draw */
 201
 202    range.primType = hw_prim;
 203    range.primitiveCount = hw_count;
 204    range.indexArray.offset = index_offset;
 205    range.indexArray.stride = index_size;
 206    range.indexWidth = index_size;
 207    range.indexBias = index_bias;
 208
 209    return svga_hwtnl_prim(hwtnl, &range, count,
 210                           min_index, max_index, index_buffer,
 211                           start_instance, instance_count,
 212                           NULL, NULL);
 213 }
 214
 215
 216 enum pipe_error
 217 svga_hwtnl_draw_range_elements(struct svga_hwtnl *hwtnl,
 218                                const struct pipe_draw_info *info,
 219                                const struct pipe_draw_start_count_bias *draw,
 220                                unsigned count)
 221 {
 222    struct pipe_context *pipe = &hwtnl->svga->pipe;
 223    enum pipe_prim_type gen_prim;
 224    unsigned gen_size, gen_nr;
 225    enum indices_mode gen_type;
 226    u_translate_func gen_func;
 227    enum pipe_error ret = PIPE_OK;
 228
 229    SVGA_STATS_TIME_PUSH(svga_sws(hwtnl->svga),
 230                         SVGA_STATS_TIME_HWTNLDRAWELEMENTS);
 231
 232    if (svga_need_unfilled_fallback(hwtnl, info->mode)) {
 233       gen_type = u_unfilled_translator(info->mode,
 234                                        info->index_size,
 235                                        count,
 236                                        hwtnl->api_fillmode,
 237                                        &gen_prim,
 238                                        &gen_size, &gen_nr, &gen_func);
 239    }
 240    else {
 241       unsigned hw_pv;
 242
 243       /* There is no geometry ordering with PATCH, so no need to
 244        * consider provoking vertex mode for the translation.
 245        * So use the same api_pv as the hw_pv.
 246        */
 247       hw_pv = info->mode == PIPE_PRIM_PATCHES ? hwtnl->api_pv :
 248                                                 hwtnl->hw_pv;
 249       gen_type = u_index_translator(svga_hw_prims,
 250                                     info->mode,
 251                                     info->index_size,
 252                                     count,
 253                                     hwtnl->api_pv,
 254                                     hw_pv,
 255                                     PR_DISABLE,
 256                                     &gen_prim, &gen_size, &gen_nr, &gen_func);
 257    }
 258
 259    if ((gen_type == U_TRANSLATE_MEMCPY) && (info->index_size == gen_size)) {
 260       /* No need for translation, just pass through to hardware:
 261        */
 262       unsigned start_offset = draw->start * info->index_size;
 263       struct pipe_resource *index_buffer = NULL;
 264       unsigned index_offset;
 265
 266       if (info->has_user_indices) {
 267          u_upload_data(pipe->stream_uploader, 0, count * info->index_size,
 268                        info->index_size, (char *) info->index.user + start_offset,
 269                        &index_offset, &index_buffer);
 270          u_upload_unmap(pipe->stream_uploader);
 271          index_offset /= info->index_size;
 272       } else {
 273          pipe_resource_reference(&index_buffer, info->index.resource);
 274          index_offset = draw->start;
 275       }
 276
 277       assert(index_buffer != NULL);
 278
 279       ret = svga_hwtnl_simple_draw_range_elements(hwtnl, index_buffer,
 280                                                   info->index_size,
 281                                                   draw->index_bias,
 282                                                   info->index_bounds_valid ? info->min_index : 0,
 283                                                   info->index_bounds_valid ? info->max_index : ~0,
 284                                                   gen_prim, index_offset, count,
 285                                                   info->start_instance,
 286                                                   info->instance_count,
 287                                                   hwtnl->svga->patch_vertices);
 288       pipe_resource_reference(&index_buffer, NULL);
 289    }
 290    else {
 291       struct pipe_resource *gen_buf = NULL;
 292       unsigned gen_offset = 0;
 293
 294       /* Need to allocate a new index buffer and run the translate
 295        * func to populate it.  Could potentially cache this translated
 296        * index buffer with the original to avoid future
 297        * re-translations.  Not much point if we're just accelerating
 298        * GL though, as index buffers are typically used only once
 299        * there.
 300        */
 301       ret = translate_indices(hwtnl, info, draw, gen_prim,
 302                               count, gen_nr, gen_size,
 303                               gen_func, &gen_buf, &gen_offset);
 304       if (ret == PIPE_OK) {
 305          gen_offset /= gen_size;
 306          ret = svga_hwtnl_simple_draw_range_elements(hwtnl,
 307                                                      gen_buf,
 308                                                      gen_size,
 309                                                      draw->index_bias,
 310                                                      info->index_bounds_valid ? info->min_index : 0,
 311                                                      info->index_bounds_valid ? info->max_index : ~0,
 312                                                      gen_prim, gen_offset,
 313                                                      gen_nr,
 314                                                      info->start_instance,
 315                                                      info->instance_count,
 316                                                      hwtnl->svga->patch_vertices);
 317       }
 318
 319       if (gen_buf) {
 320          pipe_resource_reference(&gen_buf, NULL);
 321       }
 322    }
 323
 324    SVGA_STATS_TIME_POP(svga_sws(hwtnl->svga));
 325    return ret;
 326 }