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    GLboolean depth_clamp;
  48 };
  49
  50 static void
  51 clip_unit_populate_key(struct brw_context *brw, struct brw_clip_unit_key *key)
  52 {
  53    GLcontext *ctx = &brw->intel.ctx;
  54    memset(key, 0, sizeof(*key));
  55
  56    /* CACHE_NEW_CLIP_PROG */
  57    key->total_grf = brw->clip.prog_data->total_grf;
  58    key->urb_entry_read_length = brw->clip.prog_data->urb_read_length;
  59    key->curb_entry_read_length = brw->clip.prog_data->curb_read_length;
  60    key->clip_mode = brw->clip.prog_data->clip_mode;
  61
  62    /* BRW_NEW_CURBE_OFFSETS */
  63    key->curbe_offset = brw->curbe.clip_start;
  64
  65    /* BRW_NEW_URB_FENCE */
  66    key->nr_urb_entries = brw->urb.nr_clip_entries;
  67    key->urb_size = brw->urb.vsize;
  68
  69    /* _NEW_TRANSOFORM */
  70    key->depth_clamp = ctx->Transform.DepthClamp;
  71 }
  72
  73 static dri_bo *
  74 clip_unit_create_from_key(struct brw_context *brw,
  75                           struct brw_clip_unit_key *key)
  76 {
  77    struct brw_clip_unit_state clip;
  78    dri_bo *bo;
  79
  80    memset(&clip, 0, sizeof(clip));
  81
  82    clip.thread0.grf_reg_count = ALIGN(key->total_grf, 16) / 16 - 1;
  83    /* reloc */
  84    clip.thread0.kernel_start_pointer = brw->clip.prog_bo->offset >> 6;
  85
  86    clip.thread1.floating_point_mode = BRW_FLOATING_POINT_NON_IEEE_754;
  87    clip.thread1.single_program_flow = 1;
  88
  89    clip.thread3.urb_entry_read_length = key->urb_entry_read_length;
  90    clip.thread3.const_urb_entry_read_length = key->curb_entry_read_length;
  91    clip.thread3.const_urb_entry_read_offset = key->curbe_offset * 2;
  92    clip.thread3.dispatch_grf_start_reg = 1;
  93    clip.thread3.urb_entry_read_offset = 0;
  94
  95    clip.thread4.nr_urb_entries = key->nr_urb_entries;
  96    clip.thread4.urb_entry_allocation_size = key->urb_size - 1;
  97    /* If we have enough clip URB entries to run two threads, do so.
  98     */
  99    if (key->nr_urb_entries >= 10) {
 100       /* Half of the URB entries go to each thread, and it has to be an
 101        * even number.
 102        */
 103       assert(key->nr_urb_entries % 2 == 0);
 104
 105       /* Although up to 16 concurrent Clip threads are allowed on IGDNG,
 106        * only 2 threads can output VUEs at a time.
 107        */
 108       if (BRW_IS_IGDNG(brw))
 109          clip.thread4.max_threads = 16 - 1;
 110       else
 111          clip.thread4.max_threads = 2 - 1;
 112    } else {
 113       assert(key->nr_urb_entries >= 5);
 114       clip.thread4.max_threads = 1 - 1;
 115    }
 116
 117    if (INTEL_DEBUG & DEBUG_SINGLE_THREAD)
 118       clip.thread4.max_threads = 0;
 119
 120    if (INTEL_DEBUG & DEBUG_STATS)
 121       clip.thread4.stats_enable = 1;
 122
 123    clip.clip5.userclip_enable_flags = 0x7f;
 124    clip.clip5.userclip_must_clip = 1;
 125    clip.clip5.guard_band_enable = 0;
 126    if (!key->depth_clamp)
 127       clip.clip5.viewport_z_clip_enable = 1;
 128    clip.clip5.viewport_xy_clip_enable = 1;
 129    clip.clip5.vertex_position_space = BRW_CLIP_NDCSPACE;
 130    clip.clip5.api_mode = BRW_CLIP_API_OGL;
 131    clip.clip5.clip_mode = key->clip_mode;
 132
 133    if (BRW_IS_G4X(brw))
 134       clip.clip5.negative_w_clip_test = 1;
 135
 136    clip.clip6.clipper_viewport_state_ptr = 0;
 137    clip.viewport_xmin = -1;
 138    clip.viewport_xmax = 1;
 139    clip.viewport_ymin = -1;
 140    clip.viewport_ymax = 1;
 141
 142    bo = brw_upload_cache(&brw->cache, BRW_CLIP_UNIT,
 143                          key, sizeof(*key),
 144                          &brw->clip.prog_bo, 1,
 145                          &clip, sizeof(clip),
 146                          NULL, NULL);
 147
 148    /* Emit clip program relocation */
 149    assert(brw->clip.prog_bo);
 150    dri_bo_emit_reloc(bo,
 151                      I915_GEM_DOMAIN_INSTRUCTION,
 152                      0,
 153                      clip.thread0.grf_reg_count << 1,
 154                      offsetof(struct brw_clip_unit_state, thread0),
 155                      brw->clip.prog_bo);
 156
 157    return bo;
 158 }
 159
 160 static void upload_clip_unit( struct brw_context *brw )
 161 {
 162    struct brw_clip_unit_key key;
 163
 164    clip_unit_populate_key(brw, &key);
 165
 166    dri_bo_unreference(brw->clip.state_bo);
 167    brw->clip.state_bo = brw_search_cache(&brw->cache, BRW_CLIP_UNIT,
 168                                          &key, sizeof(key),
 169                                          &brw->clip.prog_bo, 1,
 170                                          NULL);
 171    if (brw->clip.state_bo == NULL) {
 172       brw->clip.state_bo = clip_unit_create_from_key(brw, &key);
 173    }
 174 }
 175
 176 const struct brw_tracked_state brw_clip_unit = {
 177    .dirty = {
 178       .mesa  = _NEW_TRANSFORM,
 179       .brw   = (BRW_NEW_CURBE_OFFSETS |
 180                 BRW_NEW_URB_FENCE),
 181       .cache = CACHE_NEW_CLIP_PROG
 182    },
 183    .prepare = upload_clip_unit,
 184 };