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_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_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, struct pipe_resource *src,
  63                   unsigned offset,
  64                   enum pipe_prim_type orig_prim, enum pipe_prim_type gen_prim,
  65                   unsigned orig_nr, unsigned gen_nr,
  66                   unsigned index_size,
  67                   u_translate_func translate, struct pipe_resource **out_buf)
  68 {
  69    struct pipe_context *pipe = &hwtnl->svga->pipe;
  70    struct svga_screen *screen = svga_screen(pipe->screen);
  71    struct svga_buffer *src_sbuf = svga_buffer(src);
  72    struct pipe_transfer *src_transfer = NULL;
  73    struct pipe_transfer *dst_transfer = NULL;
  74    unsigned size = index_size * gen_nr;
  75    const void *src_map = NULL;
  76    struct pipe_resource *dst = NULL;
  77    void *dst_map = NULL;
  78
  79    assert(index_size == 2 || index_size == 4);
  80
  81    if (!screen->debug.no_cache_index_buffers) {
  82       /* Check if we already have a translated index buffer */
  83       if (src_sbuf->translated_indices.buffer &&
  84           src_sbuf->translated_indices.orig_prim == orig_prim &&
  85           src_sbuf->translated_indices.new_prim == gen_prim &&
  86           src_sbuf->translated_indices.offset == offset &&
  87           src_sbuf->translated_indices.count == orig_nr &&
  88           src_sbuf->translated_indices.index_size == index_size) {
  89          pipe_resource_reference(out_buf, src_sbuf->translated_indices.buffer);
  90          return PIPE_OK;
  91       }
  92    }
  93
  94    /* Need to trim vertex count to make sure we don't write too much data
  95     * to the dst buffer in the translate() call.
  96     */
  97    u_trim_pipe_prim(gen_prim, &gen_nr);
  98
  99    size = index_size * gen_nr;
 100
 101    dst = pipe_buffer_create(pipe->screen,
 102                             PIPE_BIND_INDEX_BUFFER, PIPE_USAGE_DEFAULT, size);
 103    if (!dst)
 104       goto fail;
 105
 106    src_map = pipe_buffer_map(pipe, src, PIPE_TRANSFER_READ, &src_transfer);
 107    if (!src_map)
 108       goto fail;
 109
 110    dst_map = pipe_buffer_map(pipe, dst, PIPE_TRANSFER_WRITE, &dst_transfer);
 111    if (!dst_map)
 112       goto fail;
 113
 114    translate((const char *) src_map + offset, 0, 0, gen_nr, 0, dst_map);
 115
 116    pipe_buffer_unmap(pipe, src_transfer);
 117    pipe_buffer_unmap(pipe, dst_transfer);
 118
 119    *out_buf = dst;
 120
 121    if (!screen->debug.no_cache_index_buffers) {
 122       /* Save the new, translated index buffer in the hope we can use it
 123        * again in the future.
 124        */
 125       pipe_resource_reference(&src_sbuf->translated_indices.buffer, dst);
 126       src_sbuf->translated_indices.orig_prim = orig_prim;
 127       src_sbuf->translated_indices.new_prim = gen_prim;
 128       src_sbuf->translated_indices.offset = offset;
 129       src_sbuf->translated_indices.count = orig_nr;
 130       src_sbuf->translated_indices.index_size = index_size;
 131    }
 132
 133    return PIPE_OK;
 134
 135  fail:
 136    if (src_map)
 137       pipe_buffer_unmap(pipe, src_transfer);
 138
 139    if (dst_map)
 140       pipe_buffer_unmap(pipe, dst_transfer);
 141
 142    if (dst)
 143       pipe->screen->resource_destroy(pipe->screen, dst);
 144
 145    return PIPE_ERROR_OUT_OF_MEMORY;
 146 }
 147
 148
 149 enum pipe_error
 150 svga_hwtnl_simple_draw_range_elements(struct svga_hwtnl *hwtnl,
 151                                       struct pipe_resource *index_buffer,
 152                                       unsigned index_size, int index_bias,
 153                                       unsigned min_index, unsigned max_index,
 154                                       enum pipe_prim_type prim, unsigned start,
 155                                       unsigned count,
 156                                       unsigned start_instance,
 157                                       unsigned instance_count)
 158 {
 159    SVGA3dPrimitiveRange range;
 160    unsigned hw_prim;
 161    unsigned hw_count;
 162    unsigned index_offset = start * index_size;
 163
 164    hw_prim = svga_translate_prim(prim, count, &hw_count);
 165    if (hw_count == 0)
 166       return PIPE_OK; /* nothing to draw */
 167
 168    range.primType = hw_prim;
 169    range.primitiveCount = hw_count;
 170    range.indexArray.offset = index_offset;
 171    range.indexArray.stride = index_size;
 172    range.indexWidth = index_size;
 173    range.indexBias = index_bias;
 174
 175    return svga_hwtnl_prim(hwtnl, &range, count,
 176                           min_index, max_index, index_buffer,
 177                           start_instance, instance_count);
 178 }
 179
 180
 181 enum pipe_error
 182 svga_hwtnl_draw_range_elements(struct svga_hwtnl *hwtnl,
 183                                struct pipe_resource *index_buffer,
 184                                unsigned index_size, int index_bias,
 185                                unsigned min_index, unsigned max_index,
 186                                enum pipe_prim_type prim, unsigned start, unsigned count,
 187                                unsigned start_instance, unsigned instance_count)
 188 {
 189    enum pipe_prim_type gen_prim;
 190    unsigned gen_size, gen_nr;
 191    enum indices_mode gen_type;
 192    u_translate_func gen_func;
 193    enum pipe_error ret = PIPE_OK;
 194
 195    SVGA_STATS_TIME_PUSH(svga_sws(hwtnl->svga),
 196                         SVGA_STATS_TIME_HWTNLDRAWELEMENTS);
 197
 198    if (svga_need_unfilled_fallback(hwtnl, prim)) {
 199       gen_type = u_unfilled_translator(prim,
 200                                        index_size,
 201                                        count,
 202                                        hwtnl->api_fillmode,
 203                                        &gen_prim,
 204                                        &gen_size, &gen_nr, &gen_func);
 205    }
 206    else {
 207       gen_type = u_index_translator(svga_hw_prims,
 208                                     prim,
 209                                     index_size,
 210                                     count,
 211                                     hwtnl->api_pv,
 212                                     hwtnl->hw_pv,
 213                                     PR_DISABLE,
 214                                     &gen_prim, &gen_size, &gen_nr, &gen_func);
 215    }
 216
 217    if (gen_type == U_TRANSLATE_MEMCPY) {
 218       /* No need for translation, just pass through to hardware:
 219        */
 220       ret = svga_hwtnl_simple_draw_range_elements(hwtnl, index_buffer,
 221                                                    index_size,
 222                                                    index_bias,
 223                                                    min_index,
 224                                                    max_index,
 225                                                    gen_prim, start, count,
 226                                                    start_instance,
 227                                                    instance_count);
 228    }
 229    else {
 230       struct pipe_resource *gen_buf = NULL;
 231
 232       /* Need to allocate a new index buffer and run the translate
 233        * func to populate it.  Could potentially cache this translated
 234        * index buffer with the original to avoid future
 235        * re-translations.  Not much point if we're just accelerating
 236        * GL though, as index buffers are typically used only once
 237        * there.
 238        */
 239       ret = translate_indices(hwtnl,
 240                               index_buffer,
 241                               start * index_size,
 242                               prim, gen_prim,
 243                               count, gen_nr, gen_size,
 244                               gen_func, &gen_buf);
 245       if (ret == PIPE_OK) {
 246          ret = svga_hwtnl_simple_draw_range_elements(hwtnl,
 247                                                      gen_buf,
 248                                                      gen_size,
 249                                                      index_bias,
 250                                                      min_index,
 251                                                      max_index,
 252                                                      gen_prim, 0, gen_nr,
 253                                                      start_instance,
 254                                                      instance_count);
 255       }
 256
 257       if (gen_buf) {
 258          pipe_resource_reference(&gen_buf, NULL);
 259       }
 260    }
 261
 262    SVGA_STATS_TIME_POP(svga_sws(hwtnl->svga));
 263    return ret;
 264 }