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