src/gallium/drivers/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 "util/u_math.h"
  33
  34 #include "brw_context.h"
  35 #include "brw_clip.h"
  36 #include "brw_state.h"
  37 #include "brw_defines.h"
  38 #include "brw_debug.h"
  39
  40 struct brw_clip_unit_key {
  41    unsigned int total_grf;
  42    unsigned int urb_entry_read_length;
  43    unsigned int curb_entry_read_length;
  44    unsigned int clip_mode;
  45
  46    unsigned int curbe_offset;
  47
  48    unsigned int nr_urb_entries, urb_size;
  49
  50    GLboolean depth_clamp;
  51 };
  52
  53 static void
  54 clip_unit_populate_key(struct brw_context *brw, struct brw_clip_unit_key *key)
  55 {
  56    memset(key, 0, sizeof(*key));
  57
  58    /* CACHE_NEW_CLIP_PROG */
  59    key->total_grf = brw->clip.prog_data->total_grf;
  60    key->urb_entry_read_length = brw->clip.prog_data->urb_read_length;
  61    key->curb_entry_read_length = brw->clip.prog_data->curb_read_length;
  62    key->clip_mode = brw->clip.prog_data->clip_mode;
  63
  64    /* BRW_NEW_CURBE_OFFSETS */
  65    key->curbe_offset = brw->curbe.clip_start;
  66
  67    /* BRW_NEW_URB_FENCE */
  68    key->nr_urb_entries = brw->urb.nr_clip_entries;
  69    key->urb_size = brw->urb.vsize;
  70
  71    /*  */
  72    key->depth_clamp = 0; // XXX: add this to gallium: ctx->Transform.DepthClamp;
  73 }
  74
  75 static struct brw_winsys_buffer *
  76 clip_unit_create_from_key(struct brw_context *brw,
  77                           struct brw_clip_unit_key *key)
  78 {
  79    struct brw_clip_unit_state clip;
  80    struct brw_winsys_buffer *bo;
  81
  82    memset(&clip, 0, sizeof(clip));
  83
  84    clip.thread0.grf_reg_count = align(key->total_grf, 16) / 16 - 1;
  85    /* reloc */
  86    clip.thread0.kernel_start_pointer = brw->clip.prog_bo->offset >> 6;
  87
  88    clip.thread1.floating_point_mode = BRW_FLOATING_POINT_NON_IEEE_754;
  89    clip.thread1.single_program_flow = 1;
  90
  91    clip.thread3.urb_entry_read_length = key->urb_entry_read_length;
  92    clip.thread3.const_urb_entry_read_length = key->curb_entry_read_length;
  93    clip.thread3.const_urb_entry_read_offset = key->curbe_offset * 2;
  94    clip.thread3.dispatch_grf_start_reg = 1;
  95    clip.thread3.urb_entry_read_offset = 0;
  96
  97    clip.thread4.nr_urb_entries = key->nr_urb_entries;
  98    clip.thread4.urb_entry_allocation_size = key->urb_size - 1;
  99    /* If we have enough clip URB entries to run two threads, do so.
 100     */
 101    if (key->nr_urb_entries >= 10) {
 102       /* Half of the URB entries go to each thread, and it has to be an
 103        * even number.
 104        */
 105       assert(key->nr_urb_entries % 2 == 0);
 106
 107       /* Although up to 16 concurrent Clip threads are allowed on IGDNG,
 108        * only 2 threads can output VUEs at a time.
 109        */
 110       if (BRW_IS_IGDNG(brw))
 111          clip.thread4.max_threads = 16 - 1;
 112       else
 113          clip.thread4.max_threads = 2 - 1;
 114    } else {
 115       assert(key->nr_urb_entries >= 5);
 116       clip.thread4.max_threads = 1 - 1;
 117    }
 118
 119    if (BRW_DEBUG & DEBUG_SINGLE_THREAD)
 120       clip.thread4.max_threads = 0;
 121
 122    if (BRW_DEBUG & DEBUG_STATS)
 123       clip.thread4.stats_enable = 1;
 124
 125    clip.clip5.userclip_enable_flags = 0x7f;
 126    clip.clip5.userclip_must_clip = 1;
 127    clip.clip5.guard_band_enable = 0;
 128    if (!key->depth_clamp)
 129       clip.clip5.viewport_z_clip_enable = 1;
 130    clip.clip5.viewport_xy_clip_enable = 1;
 131    clip.clip5.vertex_position_space = BRW_CLIP_NDCSPACE;
 132    clip.clip5.api_mode = BRW_CLIP_API_OGL;
 133    clip.clip5.clip_mode = key->clip_mode;
 134
 135    if (BRW_IS_G4X(brw))
 136       clip.clip5.negative_w_clip_test = 1;
 137
 138    clip.clip6.clipper_viewport_state_ptr = 0;
 139    clip.viewport_xmin = -1;
 140    clip.viewport_xmax = 1;
 141    clip.viewport_ymin = -1;
 142    clip.viewport_ymax = 1;
 143
 144    bo = brw_upload_cache(&brw->cache, BRW_CLIP_UNIT,
 145                          key, sizeof(*key),
 146                          &brw->clip.prog_bo, 1,
 147                          &clip, sizeof(clip),
 148                          NULL, NULL);
 149
 150    /* Emit clip program relocation */
 151    assert(brw->clip.prog_bo);
 152    brw->sws->bo_emit_reloc(bo,
 153                            I915_GEM_DOMAIN_INSTRUCTION,
 154                            0,
 155                            clip.thread0.grf_reg_count << 1,
 156                            offsetof(struct brw_clip_unit_state, thread0),
 157                            brw->clip.prog_bo);
 158
 159    return bo;
 160 }
 161
 162 static void upload_clip_unit( struct brw_context *brw )
 163 {
 164    struct brw_clip_unit_key key;
 165
 166    clip_unit_populate_key(brw, &key);
 167
 168    brw->sws->bo_unreference(brw->clip.state_bo);
 169    brw->clip.state_bo = brw_search_cache(&brw->cache, BRW_CLIP_UNIT,
 170                                          &key, sizeof(key),
 171                                          &brw->clip.prog_bo, 1,
 172                                          NULL);
 173    if (brw->clip.state_bo == NULL) {
 174       brw->clip.state_bo = clip_unit_create_from_key(brw, &key);
 175    }
 176 }
 177
 178 const struct brw_tracked_state brw_clip_unit = {
 179    .dirty = {
 180       .mesa  = 0,
 181       .brw   = (BRW_NEW_CURBE_OFFSETS |
 182                 BRW_NEW_URB_FENCE),
 183       .cache = CACHE_NEW_CLIP_PROG
 184    },
 185    .prepare = upload_clip_unit,
 186 };