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 intel_context *intel = &brw->intel;
  78    struct brw_clip_unit_state clip;
  79    dri_bo *bo;
  80
  81    memset(&clip, 0, sizeof(clip));
  82
  83    clip.thread0.grf_reg_count = ALIGN(key->total_grf, 16) / 16 - 1;
  84    /* reloc */
  85    clip.thread0.kernel_start_pointer = brw->clip.prog_bo->offset >> 6;
  86
  87    clip.thread1.floating_point_mode = BRW_FLOATING_POINT_NON_IEEE_754;
  88    clip.thread1.single_program_flow = 1;
  89
  90    clip.thread3.urb_entry_read_length = key->urb_entry_read_length;
  91    clip.thread3.const_urb_entry_read_length = key->curb_entry_read_length;
  92    clip.thread3.const_urb_entry_read_offset = key->curbe_offset * 2;
  93    clip.thread3.dispatch_grf_start_reg = 1;
  94    clip.thread3.urb_entry_read_offset = 0;
  95
  96    clip.thread4.nr_urb_entries = key->nr_urb_entries;
  97    clip.thread4.urb_entry_allocation_size = key->urb_size - 1;
  98    /* If we have enough clip URB entries to run two threads, do so.
  99     */
 100    if (key->nr_urb_entries >= 10) {
 101       /* Half of the URB entries go to each thread, and it has to be an
 102        * even number.
 103        */
 104       assert(key->nr_urb_entries % 2 == 0);
 105
 106       /* Although up to 16 concurrent Clip threads are allowed on IGDNG,
 107        * only 2 threads can output VUEs at a time.
 108        */
 109       if (intel->is_ironlake)
 110          clip.thread4.max_threads = 16 - 1;
 111       else
 112          clip.thread4.max_threads = 2 - 1;
 113    } else {
 114       assert(key->nr_urb_entries >= 5);
 115       clip.thread4.max_threads = 1 - 1;
 116    }
 117
 118    if (INTEL_DEBUG & DEBUG_SINGLE_THREAD)
 119       clip.thread4.max_threads = 0;
 120
 121    if (INTEL_DEBUG & DEBUG_STATS)
 122       clip.thread4.stats_enable = 1;
 123
 124    clip.clip5.userclip_enable_flags = 0x7f;
 125    clip.clip5.userclip_must_clip = 1;
 126    clip.clip5.guard_band_enable = 0;
 127    if (!key->depth_clamp)
 128       clip.clip5.viewport_z_clip_enable = 1;
 129    clip.clip5.viewport_xy_clip_enable = 1;
 130    clip.clip5.vertex_position_space = BRW_CLIP_NDCSPACE;
 131    clip.clip5.api_mode = BRW_CLIP_API_OGL;
 132    clip.clip5.clip_mode = key->clip_mode;
 133
 134    if (intel->is_g4x)
 135       clip.clip5.negative_w_clip_test = 1;
 136
 137    clip.clip6.clipper_viewport_state_ptr = 0;
 138    clip.viewport_xmin = -1;
 139    clip.viewport_xmax = 1;
 140    clip.viewport_ymin = -1;
 141    clip.viewport_ymax = 1;
 142
 143    bo = brw_upload_cache(&brw->cache, BRW_CLIP_UNIT,
 144                          key, sizeof(*key),
 145                          &brw->clip.prog_bo, 1,
 146                          &clip, sizeof(clip),
 147                          NULL, NULL);
 148
 149    /* Emit clip program relocation */
 150    assert(brw->clip.prog_bo);
 151    dri_bo_emit_reloc(bo,
 152                      I915_GEM_DOMAIN_INSTRUCTION,
 153                      0,
 154                      clip.thread0.grf_reg_count << 1,
 155                      offsetof(struct brw_clip_unit_state, thread0),
 156                      brw->clip.prog_bo);
 157
 158    return bo;
 159 }
 160
 161 static void upload_clip_unit( struct brw_context *brw )
 162 {
 163    struct brw_clip_unit_key key;
 164
 165    clip_unit_populate_key(brw, &key);
 166
 167    dri_bo_unreference(brw->clip.state_bo);
 168    brw->clip.state_bo = brw_search_cache(&brw->cache, BRW_CLIP_UNIT,
 169                                          &key, sizeof(key),
 170                                          &brw->clip.prog_bo, 1,
 171                                          NULL);
 172    if (brw->clip.state_bo == NULL) {
 173       brw->clip.state_bo = clip_unit_create_from_key(brw, &key);
 174    }
 175 }
 176
 177 const struct brw_tracked_state brw_clip_unit = {
 178    .dirty = {
 179       .mesa  = _NEW_TRANSFORM,
 180       .brw   = (BRW_NEW_CURBE_OFFSETS |
 181                 BRW_NEW_URB_FENCE),
 182       .cache = CACHE_NEW_CLIP_PROG
 183    },
 184    .prepare = upload_clip_unit,
 185 };