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_format.h"
  28 #include "util/u_helpers.h"
  29 #include "util/u_inlines.h"
  30 #include "util/u_prim.h"
  31 #include "util/u_prim_restart.h"
  32 #include "util/u_upload_mgr.h"
  33 #include "indices/u_indices.h"
  34
  35 #include "svga_hw_reg.h"
  36 #include "svga_cmd.h"
  37 #include "svga_context.h"
  38 #include "svga_screen.h"
  39 #include "svga_draw.h"
  40 #include "svga_shader.h"
  41 #include "svga_state.h"
  42 #include "svga_surface.h"
  43 #include "svga_swtnl.h"
  44 #include "svga_debug.h"
  45 #include "svga_resource_buffer.h"
  46
  47 /* Returns TRUE if we are currently using flat shading.
  48  */
  49 static boolean
  50 is_using_flat_shading(const struct svga_context *svga)
  51 {
  52    return
  53       svga->state.hw_draw.fs ? svga->state.hw_draw.fs->uses_flat_interp : FALSE;
  54 }
  55
  56
  57 static enum pipe_error
  58 retry_draw_range_elements( struct svga_context *svga,
  59                            struct pipe_resource *index_buffer,
  60                            unsigned index_size,
  61                            int index_bias,
  62                            unsigned min_index,
  63                            unsigned max_index,
  64                            enum pipe_prim_type prim,
  65                            unsigned start,
  66                            unsigned count,
  67                            unsigned start_instance,
  68                            unsigned instance_count)
  69 {
  70    enum pipe_error ret;
  71
  72    SVGA_STATS_TIME_PUSH(svga_sws(svga), SVGA_STATS_TIME_DRAWELEMENTS);
  73
  74    svga_hwtnl_set_fillmode(svga->hwtnl, svga->curr.rast->hw_fillmode);
  75
  76    /** determine if flatshade is to be used after svga_update_state()
  77     *  in case the fragment shader is changed.
  78     */
  79    svga_hwtnl_set_flatshade(svga->hwtnl,
  80                             svga->curr.rast->templ.flatshade ||
  81                             is_using_flat_shading(svga),
  82                             svga->curr.rast->templ.flatshade_first);
  83
  84    for (unsigned try = 0; try < 2; try++) {
  85       ret = svga_update_state(svga, SVGA_STATE_HW_DRAW);
  86       if (ret == PIPE_OK) {
  87          ret = svga_hwtnl_draw_range_elements(svga->hwtnl,
  88                                               index_buffer, index_size,
  89                                               index_bias,
  90                                               min_index, max_index,
  91                                               prim, start, count,
  92                                               start_instance, instance_count);
  93          if (ret == PIPE_OK)
  94             break;
  95       }
  96       svga_context_flush(svga, NULL);
  97    }
  98
  99    SVGA_STATS_TIME_POP(svga_sws(svga));
 100    return ret;
 101 }
 102
 103
 104 static enum pipe_error
 105 retry_draw_arrays( struct svga_context *svga,
 106                    enum pipe_prim_type prim, unsigned start, unsigned count,
 107                    unsigned start_instance, unsigned instance_count)
 108 {
 109    enum pipe_error ret;
 110
 111    SVGA_STATS_TIME_PUSH(svga_sws(svga), SVGA_STATS_TIME_DRAWARRAYS);
 112
 113    svga_hwtnl_set_fillmode(svga->hwtnl, svga->curr.rast->hw_fillmode);
 114
 115    /** determine if flatshade is to be used after svga_update_state()
 116     *  in case the fragment shader is changed.
 117     */
 118    svga_hwtnl_set_flatshade(svga->hwtnl,
 119                             svga->curr.rast->templ.flatshade ||
 120                             is_using_flat_shading(svga),
 121                             svga->curr.rast->templ.flatshade_first);
 122
 123    for (unsigned try = 0; try < 2; try++) {
 124       ret = svga_update_state( svga, SVGA_STATE_HW_DRAW );
 125       if (ret == PIPE_OK) {
 126          ret = svga_hwtnl_draw_arrays(svga->hwtnl, prim, start, count,
 127                                       start_instance, instance_count);
 128          if (ret == PIPE_OK)
 129             break;
 130       }
 131       svga_context_flush(svga, NULL);
 132    }
 133
 134    SVGA_STATS_TIME_POP(svga_sws(svga));
 135    return ret;
 136 }
 137
 138
 139 /**
 140  * Determine if we need to implement primitive restart with a fallback
 141  * path which breaks the original primitive into sub-primitive at the
 142  * restart indexes.
 143  */
 144 static boolean
 145 need_fallback_prim_restart(const struct svga_context *svga,
 146                            const struct pipe_draw_info *info)
 147 {
 148    if (info->primitive_restart && info->index_size) {
 149       if (!svga_have_vgpu10(svga))
 150          return TRUE;
 151       else if (!svga->state.sw.need_swtnl) {
 152          if (info->index_size == 1)
 153             return TRUE; /* no device support for 1-byte indexes */
 154          else if (info->index_size == 2)
 155             return info->restart_index != 0xffff;
 156          else
 157             return info->restart_index != 0xffffffff;
 158       }
 159    }
 160
 161    return FALSE;
 162 }
 163
 164
 165 static void
 166 svga_draw_vbo(struct pipe_context *pipe, const struct pipe_draw_info *info)
 167 {
 168    struct svga_context *svga = svga_context( pipe );
 169    enum pipe_prim_type reduced_prim = u_reduced_prim( info->mode );
 170    unsigned count = info->count;
 171    enum pipe_error ret = 0;
 172    boolean needed_swtnl;
 173    struct pipe_resource *indexbuf =
 174       info->has_user_indices ? NULL : info->index.resource;
 175
 176    SVGA_STATS_TIME_PUSH(svga_sws(svga), SVGA_STATS_TIME_DRAWVBO);
 177
 178    svga->hud.num_draw_calls++;  /* for SVGA_QUERY_NUM_DRAW_CALLS */
 179
 180    if (u_reduced_prim(info->mode) == PIPE_PRIM_TRIANGLES &&
 181        svga->curr.rast->templ.cull_face == PIPE_FACE_FRONT_AND_BACK)
 182       goto done;
 183
 184    /* Upload a user index buffer. */
 185    unsigned index_offset = 0;
 186    if (info->index_size && info->has_user_indices &&
 187        !util_upload_index_buffer(pipe, info, &indexbuf, &index_offset)) {
 188       goto done;
 189    }
 190
 191    /*
 192     * Mark currently bound target surfaces as dirty
 193     * doesn't really matter if it is done before drawing.
 194     *
 195     * TODO If we ever normaly return something other then
 196     * true we should not mark it as dirty then.
 197     */
 198    svga_mark_surfaces_dirty(svga_context(pipe));
 199
 200    if (svga->curr.reduced_prim != reduced_prim) {
 201       svga->curr.reduced_prim = reduced_prim;
 202       svga->dirty |= SVGA_NEW_REDUCED_PRIMITIVE;
 203    }
 204
 205    if (need_fallback_prim_restart(svga, info)) {
 206       enum pipe_error r;
 207       r = util_draw_vbo_without_prim_restart(pipe, info);
 208       assert(r == PIPE_OK);
 209       (void) r;
 210       goto done;
 211    }
 212
 213    if (!u_trim_pipe_prim( info->mode, &count ))
 214       goto done;
 215
 216    needed_swtnl = svga->state.sw.need_swtnl;
 217
 218    svga_update_state_retry( svga, SVGA_STATE_NEED_SWTNL );
 219
 220    if (svga->state.sw.need_swtnl) {
 221       svga->hud.num_fallbacks++;  /* for SVGA_QUERY_NUM_FALLBACKS */
 222       if (!needed_swtnl) {
 223          /*
 224           * We're switching from HW to SW TNL.  SW TNL will require mapping all
 225           * currently bound vertex buffers, some of which may already be
 226           * referenced in the current command buffer as result of previous HW
 227           * TNL. So flush now, to prevent the context to flush while a referred
 228           * vertex buffer is mapped.
 229           */
 230
 231          svga_context_flush(svga, NULL);
 232       }
 233
 234       /* Avoid leaking the previous hwtnl bias to swtnl */
 235       svga_hwtnl_set_index_bias( svga->hwtnl, 0 );
 236       ret = svga_swtnl_draw_vbo(svga, info, indexbuf, index_offset);
 237    }
 238    else {
 239       if (info->index_size && indexbuf) {
 240          unsigned offset;
 241
 242          assert(index_offset % info->index_size == 0);
 243          offset = index_offset / info->index_size;
 244
 245          ret = retry_draw_range_elements( svga,
 246                                           indexbuf,
 247                                           info->index_size,
 248                                           info->index_bias,
 249                                           info->min_index,
 250                                           info->max_index,
 251                                           info->mode,
 252                                           info->start + offset,
 253                                           count,
 254                                           info->start_instance,
 255                                           info->instance_count);
 256       }
 257       else {
 258          ret = retry_draw_arrays(svga, info->mode, info->start, count,
 259                                  info->start_instance, info->instance_count);
 260       }
 261    }
 262
 263    /* XXX: Silence warnings, do something sensible here? */
 264    (void)ret;
 265
 266    if (SVGA_DEBUG & DEBUG_FLUSH) {
 267       svga_hwtnl_flush_retry( svga );
 268       svga_context_flush(svga, NULL);
 269    }
 270
 271 done:
 272    if (info->index_size && info->index.resource != indexbuf)
 273       pipe_resource_reference(&indexbuf, NULL);
 274    SVGA_STATS_TIME_POP(svga_sws(svga));
 275 }
 276
 277
 278 void svga_init_draw_functions( struct svga_context *svga )
 279 {
 280    svga->pipe.draw_vbo = svga_draw_vbo;
 281 }