src/gallium/drivers/svga/svga_pipe_draw.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
  27 #include "util/u_helpers.h"
  28 #include "util/u_inlines.h"
  29 #include "util/u_prim.h"
  30 #include "util/u_prim_restart.h"
  31
  32 #include "svga_context.h"
  33 #include "svga_draw.h"
  34 #include "svga_shader.h"
  35 #include "svga_surface.h"
  36 #include "svga_swtnl.h"
  37 #include "svga_debug.h"
  38 #include "svga_resource_buffer.h"
  39
  40 /* Returns TRUE if we are currently using flat shading.
  41  */
  42 static boolean
  43 is_using_flat_shading(const struct svga_context *svga)
  44 {
  45    return
  46       svga->state.hw_draw.fs ? svga->state.hw_draw.fs->uses_flat_interp : FALSE;
  47 }
  48
  49
  50 static enum pipe_error
  51 retry_draw_range_elements(struct svga_context *svga,
  52                           struct pipe_resource *index_buffer,
  53                           unsigned index_size,
  54                           int index_bias,
  55                           unsigned min_index,
  56                           unsigned max_index,
  57                           enum pipe_prim_type prim,
  58                           unsigned start,
  59                           unsigned count,
  60                           unsigned start_instance,
  61                           unsigned instance_count)
  62 {
  63    enum pipe_error ret;
  64
  65    SVGA_STATS_TIME_PUSH(svga_sws(svga), SVGA_STATS_TIME_DRAWELEMENTS);
  66
  67    svga_hwtnl_set_fillmode(svga->hwtnl, svga->curr.rast->hw_fillmode);
  68
  69    /** determine if flatshade is to be used after svga_update_state()
  70     *  in case the fragment shader is changed.
  71     */
  72    svga_hwtnl_set_flatshade(svga->hwtnl,
  73                             svga->curr.rast->templ.flatshade ||
  74                             is_using_flat_shading(svga),
  75                             svga->curr.rast->templ.flatshade_first);
  76
  77    for (unsigned try = 0; try < 2; try++) {
  78       ret = svga_hwtnl_draw_range_elements(svga->hwtnl,
  79                                            index_buffer, index_size,
  80                                            index_bias,
  81                                            min_index, max_index,
  82                                            prim, start, count,
  83                                            start_instance, instance_count);
  84       if (ret == PIPE_OK)
  85          break;
  86       svga_context_flush(svga, NULL);
  87    }
  88
  89    SVGA_STATS_TIME_POP(svga_sws(svga));
  90    return ret;
  91 }
  92
  93
  94 static enum pipe_error
  95 retry_draw_arrays(struct svga_context *svga,
  96                   enum pipe_prim_type prim, unsigned start, unsigned count,
  97                   unsigned start_instance, unsigned instance_count)
  98 {
  99    enum pipe_error ret;
 100
 101    SVGA_STATS_TIME_PUSH(svga_sws(svga), SVGA_STATS_TIME_DRAWARRAYS);
 102
 103    svga_hwtnl_set_fillmode(svga->hwtnl, svga->curr.rast->hw_fillmode);
 104
 105    /** determine if flatshade is to be used after svga_update_state()
 106     *  in case the fragment shader is changed.
 107     */
 108    svga_hwtnl_set_flatshade(svga->hwtnl,
 109                             svga->curr.rast->templ.flatshade ||
 110                             is_using_flat_shading(svga),
 111                             svga->curr.rast->templ.flatshade_first);
 112
 113    for (unsigned try = 0; try < 2; try++) {
 114       ret = svga_hwtnl_draw_arrays(svga->hwtnl, prim, start, count,
 115                                    start_instance, instance_count);
 116       if (ret == PIPE_OK)
 117          break;
 118       svga_context_flush(svga, NULL);
 119    }
 120
 121    SVGA_STATS_TIME_POP(svga_sws(svga));
 122    return ret;
 123 }
 124
 125
 126 /**
 127  * Determine if we need to implement primitive restart with a fallback
 128  * path which breaks the original primitive into sub-primitive at the
 129  * restart indexes.
 130  */
 131 static boolean
 132 need_fallback_prim_restart(const struct svga_context *svga,
 133                            const struct pipe_draw_info *info)
 134 {
 135    if (info->primitive_restart && info->index_size) {
 136       if (!svga_have_vgpu10(svga))
 137          return TRUE;
 138       else if (!svga->state.sw.need_swtnl) {
 139          if (info->index_size == 1)
 140             return TRUE; /* no device support for 1-byte indexes */
 141          else if (info->index_size == 2)
 142             return info->restart_index != 0xffff;
 143          else
 144             return info->restart_index != 0xffffffff;
 145       }
 146    }
 147
 148    return FALSE;
 149 }
 150
 151
 152 static void
 153 svga_draw_vbo(struct pipe_context *pipe, const struct pipe_draw_info *info)
 154 {
 155    struct svga_context *svga = svga_context(pipe);
 156    enum pipe_prim_type reduced_prim = u_reduced_prim(info->mode);
 157    unsigned count = info->count;
 158    enum pipe_error ret = 0;
 159    boolean needed_swtnl;
 160    struct pipe_resource *indexbuf =
 161       info->has_user_indices ? NULL : info->index.resource;
 162
 163    SVGA_STATS_TIME_PUSH(svga_sws(svga), SVGA_STATS_TIME_DRAWVBO);
 164
 165    svga->hud.num_draw_calls++;  /* for SVGA_QUERY_NUM_DRAW_CALLS */
 166
 167    if (u_reduced_prim(info->mode) == PIPE_PRIM_TRIANGLES &&
 168        svga->curr.rast->templ.cull_face == PIPE_FACE_FRONT_AND_BACK)
 169       goto done;
 170
 171    /* Upload a user index buffer. */
 172    unsigned index_offset = 0;
 173    if (info->index_size && info->has_user_indices &&
 174        !util_upload_index_buffer(pipe, info, &indexbuf, &index_offset)) {
 175       goto done;
 176    }
 177
 178    /*
 179     * Mark currently bound target surfaces as dirty
 180     * doesn't really matter if it is done before drawing.
 181     *
 182     * TODO If we ever normaly return something other then
 183     * true we should not mark it as dirty then.
 184     */
 185    svga_mark_surfaces_dirty(svga_context(pipe));
 186
 187    if (svga->curr.reduced_prim != reduced_prim) {
 188       svga->curr.reduced_prim = reduced_prim;
 189       svga->dirty |= SVGA_NEW_REDUCED_PRIMITIVE;
 190    }
 191
 192    if (need_fallback_prim_restart(svga, info)) {
 193       enum pipe_error r;
 194       r = util_draw_vbo_without_prim_restart(pipe, info);
 195       assert(r == PIPE_OK);
 196       (void) r;
 197       goto done;
 198    }
 199
 200    if (!u_trim_pipe_prim(info->mode, &count))
 201       goto done;
 202
 203    needed_swtnl = svga->state.sw.need_swtnl;
 204
 205    svga_update_state_retry(svga, SVGA_STATE_NEED_SWTNL);
 206
 207    if (svga->state.sw.need_swtnl) {
 208       svga->hud.num_fallbacks++;  /* for SVGA_QUERY_NUM_FALLBACKS */
 209       if (!needed_swtnl) {
 210          /*
 211           * We're switching from HW to SW TNL.  SW TNL will require mapping all
 212           * currently bound vertex buffers, some of which may already be
 213           * referenced in the current command buffer as result of previous HW
 214           * TNL. So flush now, to prevent the context to flush while a referred
 215           * vertex buffer is mapped.
 216           */
 217
 218          svga_context_flush(svga, NULL);
 219       }
 220
 221       /* Avoid leaking the previous hwtnl bias to swtnl */
 222       svga_hwtnl_set_index_bias(svga->hwtnl, 0);
 223       ret = svga_swtnl_draw_vbo(svga, info, indexbuf, index_offset);
 224    }
 225    else {
 226       ret = svga_update_state(svga, SVGA_STATE_HW_DRAW);
 227       if (ret != PIPE_OK) {
 228          svga_context_flush(svga, NULL);
 229          ret = svga_update_state(svga, SVGA_STATE_HW_DRAW);
 230          assert(ret == PIPE_OK);
 231       }
 232
 233       if (info->index_size && indexbuf) {
 234          unsigned offset;
 235
 236          assert(index_offset % info->index_size == 0);
 237          offset = index_offset / info->index_size;
 238
 239          ret = retry_draw_range_elements(svga,
 240                                          indexbuf,
 241                                          info->index_size,
 242                                          info->index_bias,
 243                                          info->min_index,
 244                                          info->max_index,
 245                                          info->mode,
 246                                          info->start + offset,
 247                                          count,
 248                                          info->start_instance,
 249                                          info->instance_count);
 250       }
 251       else {
 252          ret = retry_draw_arrays(svga, info->mode, info->start, count,
 253                                  info->start_instance, info->instance_count);
 254       }
 255    }
 256
 257    /* XXX: Silence warnings, do something sensible here? */
 258    (void)ret;
 259
 260    if (SVGA_DEBUG & DEBUG_FLUSH) {
 261       svga_hwtnl_flush_retry(svga);
 262       svga_context_flush(svga, NULL);
 263    }
 264
 265 done:
 266    if (info->index_size && info->index.resource != indexbuf)
 267       pipe_resource_reference(&indexbuf, NULL);
 268    SVGA_STATS_TIME_POP(svga_sws(svga));
 269 }
 270
 271
 272 void
 273 svga_init_draw_functions(struct svga_context *svga)
 274 {
 275    svga->pipe.draw_vbo = svga_draw_vbo;
 276 }