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       clip.thread4.max_threads = 2 - 1;
  99    } else {
 100       assert(key->nr_urb_entries >= 5);
 101       clip.thread4.max_threads = 1 - 1;
 102    }
 103
 104    if (INTEL_DEBUG & DEBUG_SINGLE_THREAD)
 105       clip.thread4.max_threads = 0;
 106
 107    if (INTEL_DEBUG & DEBUG_STATS)
 108       clip.thread4.stats_enable = 1;
 109
 110    clip.clip5.userclip_enable_flags = 0x7f;
 111    clip.clip5.userclip_must_clip = 1;
 112    clip.clip5.guard_band_enable = 0;
 113    clip.clip5.viewport_z_clip_enable = 1;
 114    clip.clip5.viewport_xy_clip_enable = 1;
 115    clip.clip5.vertex_position_space = BRW_CLIP_NDCSPACE;
 116    clip.clip5.api_mode = BRW_CLIP_API_OGL;
 117    clip.clip5.clip_mode = key->clip_mode;
 118
 119    if (BRW_IS_G4X(brw))
 120       clip.clip5.negative_w_clip_test = 1;
 121
 122    clip.clip6.clipper_viewport_state_ptr = 0;
 123    clip.viewport_xmin = -1;
 124    clip.viewport_xmax = 1;
 125    clip.viewport_ymin = -1;
 126    clip.viewport_ymax = 1;
 127
 128    bo = brw_upload_cache(&brw->cache, BRW_CLIP_UNIT,
 129                          key, sizeof(*key),
 130                          &brw->clip.prog_bo, 1,
 131                          &clip, sizeof(clip),
 132                          NULL, NULL);
 133
 134    /* Emit clip program relocation */
 135    assert(brw->clip.prog_bo);
 136    dri_bo_emit_reloc(bo,
 137                      I915_GEM_DOMAIN_INSTRUCTION,
 138                      0,
 139                      clip.thread0.grf_reg_count << 1,
 140                      offsetof(struct brw_clip_unit_state, thread0),
 141                      brw->clip.prog_bo);
 142
 143    return bo;
 144 }
 145
 146 static void upload_clip_unit( struct brw_context *brw )
 147 {
 148    struct brw_clip_unit_key key;
 149
 150    clip_unit_populate_key(brw, &key);
 151
 152    dri_bo_unreference(brw->clip.state_bo);
 153    brw->clip.state_bo = brw_search_cache(&brw->cache, BRW_CLIP_UNIT,
 154                                          &key, sizeof(key),
 155                                          &brw->clip.prog_bo, 1,
 156                                          NULL);
 157    if (brw->clip.state_bo == NULL) {
 158       brw->clip.state_bo = clip_unit_create_from_key(brw, &key);
 159    }
 160 }
 161
 162 const struct brw_tracked_state brw_clip_unit = {
 163    .dirty = {
 164       .mesa  = 0,
 165       .brw   = (BRW_NEW_CURBE_OFFSETS |
 166                 BRW_NEW_URB_FENCE),
 167       .cache = CACHE_NEW_CLIP_PROG
 168    },
 169    .prepare = upload_clip_unit,
 170 };