src/mesa/drivers/dri/i965/brw_clip_state.c

   1 /*
   2  Copyright (C) Intel Corp.  2006.  All Rights Reserved.
   3  Intel funded Tungsten Graphics (http://www.tungstengraphics.com) to
   4  develop this 3D driver.
   5
   6  Permission is hereby granted, free of charge, to any person obtaining
   7  a copy of this software and associated documentation files (the
   8  "Software"), to deal in the Software without restriction, including
   9  without limitation the rights to use, copy, modify, merge, publish,
  10  distribute, sublicense, and/or sell copies of the Software, and to
  11  permit persons to whom the Software is furnished to do so, subject to
  12  the following conditions:
  13
  14  The above copyright notice and this permission notice (including the
  15  next paragraph) shall be included in all copies or substantial
  16  portions of the Software.
  17
  18  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  19  EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  20  MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
  21  IN NO EVENT SHALL THE COPYRIGHT OWNER(S) AND/OR ITS SUPPLIERS BE
  22  LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  23  OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  24  WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  25
  26  **********************************************************************/
  27  /*
  28   * Authors:
  29   *   Keith Whitwell <keith@tungstengraphics.com>
  30   */
  31
  32 #include "brw_context.h"
  33 #include "brw_state.h"
  34 #include "brw_defines.h"
  35 #include "main/macros.h"
  36
  37 struct brw_clip_unit_key {
  38    unsigned int total_grf;
  39    unsigned int urb_entry_read_length;
  40    unsigned int curb_entry_read_length;
  41    unsigned int clip_mode;
  42
  43    unsigned int curbe_offset;
  44
  45    unsigned int nr_urb_entries, urb_size;
  46 };
  47
  48 static void
  49 clip_unit_populate_key(struct brw_context *brw, struct brw_clip_unit_key *key)
  50 {
  51    memset(key, 0, sizeof(*key));
  52
  53    /* CACHE_NEW_CLIP_PROG */
  54    key->total_grf = brw->clip.prog_data->total_grf;
  55    key->urb_entry_read_length = brw->clip.prog_data->urb_read_length;
  56    key->curb_entry_read_length = brw->clip.prog_data->curb_read_length;
  57    key->clip_mode = brw->clip.prog_data->clip_mode;
  58
  59    /* BRW_NEW_CURBE_OFFSETS */
  60    key->curbe_offset = brw->curbe.clip_start;
  61
  62    /* BRW_NEW_URB_FENCE */
  63    key->nr_urb_entries = brw->urb.nr_clip_entries;
  64    key->urb_size = brw->urb.vsize;
  65 }
  66
  67 static dri_bo *
  68 clip_unit_create_from_key(struct brw_context *brw,
  69                           struct brw_clip_unit_key *key)
  70 {
  71    struct brw_clip_unit_state clip;
  72    dri_bo *bo;
  73
  74    memset(&clip, 0, sizeof(clip));
  75
  76    clip.thread0.grf_reg_count = ALIGN(key->total_grf, 16) / 16 - 1;
  77    /* reloc */
  78    clip.thread0.kernel_start_pointer = brw->clip.prog_bo->offset >> 6;
  79
  80    clip.thread1.floating_point_mode = BRW_FLOATING_POINT_NON_IEEE_754;
  81    clip.thread1.single_program_flow = 1;
  82
  83    clip.thread3.urb_entry_read_length = key->urb_entry_read_length;
  84    clip.thread3.const_urb_entry_read_length = key->curb_entry_read_length;
  85    clip.thread3.const_urb_entry_read_offset = key->curbe_offset * 2;
  86    clip.thread3.dispatch_grf_start_reg = 1;
  87    clip.thread3.urb_entry_read_offset = 0;
  88
  89    clip.thread4.nr_urb_entries = key->nr_urb_entries;
  90    clip.thread4.urb_entry_allocation_size = key->urb_size - 1;
  91    /* If we have enough clip URB entries to run two threads, do so.
  92     */
  93    if (key->nr_urb_entries >= 10) {
  94       /* Half of the URB entries go to each thread, and it has to be an
  95        * even number.
  96        */
  97       assert(key->nr_urb_entries % 2 == 0);
  98
  99       /* Although up to 16 concurrent Clip threads are allowed on IGDNG,
 100        * only 2 threads can output VUEs at a time.
 101        */
 102       if (BRW_IS_IGDNG(brw))
 103          clip.thread4.max_threads = 16 - 1;
 104       else
 105          clip.thread4.max_threads = 2 - 1;
 106    } else {
 107       assert(key->nr_urb_entries >= 5);
 108       clip.thread4.max_threads = 1 - 1;
 109    }
 110
 111    if (INTEL_DEBUG & DEBUG_SINGLE_THREAD)
 112       clip.thread4.max_threads = 0;
 113
 114    if (INTEL_DEBUG & DEBUG_STATS)
 115       clip.thread4.stats_enable = 1;
 116
 117    clip.clip5.userclip_enable_flags = 0x7f;
 118    clip.clip5.userclip_must_clip = 1;
 119    clip.clip5.guard_band_enable = 0;
 120    clip.clip5.viewport_z_clip_enable = 1;
 121    clip.clip5.viewport_xy_clip_enable = 1;
 122    clip.clip5.vertex_position_space = BRW_CLIP_NDCSPACE;
 123    clip.clip5.api_mode = BRW_CLIP_API_OGL;
 124    clip.clip5.clip_mode = key->clip_mode;
 125
 126    if (BRW_IS_G4X(brw))
 127       clip.clip5.negative_w_clip_test = 1;
 128
 129    clip.clip6.clipper_viewport_state_ptr = 0;
 130    clip.viewport_xmin = -1;
 131    clip.viewport_xmax = 1;
 132    clip.viewport_ymin = -1;
 133    clip.viewport_ymax = 1;
 134
 135    bo = brw_upload_cache(&brw->cache, BRW_CLIP_UNIT,
 136                          key, sizeof(*key),
 137                          &brw->clip.prog_bo, 1,
 138                          &clip, sizeof(clip),
 139                          NULL, NULL);
 140
 141    /* Emit clip program relocation */
 142    assert(brw->clip.prog_bo);
 143    dri_bo_emit_reloc(bo,
 144                      I915_GEM_DOMAIN_INSTRUCTION,
 145                      0,
 146                      clip.thread0.grf_reg_count << 1,
 147                      offsetof(struct brw_clip_unit_state, thread0),
 148                      brw->clip.prog_bo);
 149
 150    return bo;
 151 }
 152
 153 static void upload_clip_unit( struct brw_context *brw )
 154 {
 155    struct brw_clip_unit_key key;
 156
 157    clip_unit_populate_key(brw, &key);
 158
 159    dri_bo_unreference(brw->clip.state_bo);
 160    brw->clip.state_bo = brw_search_cache(&brw->cache, BRW_CLIP_UNIT,
 161                                          &key, sizeof(key),
 162                                          &brw->clip.prog_bo, 1,
 163                                          NULL);
 164    if (brw->clip.state_bo == NULL) {
 165       brw->clip.state_bo = clip_unit_create_from_key(brw, &key);
 166    }
 167 }
 168
 169 const struct brw_tracked_state brw_clip_unit = {
 170    .dirty = {
 171       .mesa  = 0,
 172       .brw   = (BRW_NEW_CURBE_OFFSETS |
 173                 BRW_NEW_URB_FENCE),
 174       .cache = CACHE_NEW_CLIP_PROG
 175    },
 176    .prepare = upload_clip_unit,
 177 };