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