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    clip.thread4.max_threads = 1; /* 2 threads */
  92
  93    if (INTEL_DEBUG & DEBUG_STATS)
  94       clip.thread4.stats_enable = 1;
  95
  96    clip.clip5.userclip_enable_flags = 0x7f;
  97    clip.clip5.userclip_must_clip = 1;
  98    clip.clip5.guard_band_enable = 0;
  99    clip.clip5.viewport_z_clip_enable = 1;
 100    clip.clip5.viewport_xy_clip_enable = 1;
 101    clip.clip5.vertex_position_space = BRW_CLIP_NDCSPACE;
 102    clip.clip5.api_mode = BRW_CLIP_API_OGL;
 103    clip.clip5.clip_mode = key->clip_mode;
 104
 105    if (BRW_IS_G4X(brw))
 106       clip.clip5.negative_w_clip_test = 1;
 107
 108    clip.clip6.clipper_viewport_state_ptr = 0;
 109    clip.viewport_xmin = -1;
 110    clip.viewport_xmax = 1;
 111    clip.viewport_ymin = -1;
 112    clip.viewport_ymax = 1;
 113
 114    bo = brw_upload_cache(&brw->cache, BRW_CLIP_UNIT,
 115                          key, sizeof(*key),
 116                          &brw->clip.prog_bo, 1,
 117                          &clip, sizeof(clip),
 118                          NULL, NULL);
 119
 120    /* Emit clip program relocation */
 121    assert(brw->clip.prog_bo);
 122    dri_bo_emit_reloc(bo,
 123                      I915_GEM_DOMAIN_INSTRUCTION,
 124                      0,
 125                      clip.thread0.grf_reg_count << 1,
 126                      offsetof(struct brw_clip_unit_state, thread0),
 127                      brw->clip.prog_bo);
 128
 129    return bo;
 130 }
 131
 132 static void upload_clip_unit( struct brw_context *brw )
 133 {
 134    struct brw_clip_unit_key key;
 135
 136    clip_unit_populate_key(brw, &key);
 137
 138    dri_bo_unreference(brw->clip.state_bo);
 139    brw->clip.state_bo = brw_search_cache(&brw->cache, BRW_CLIP_UNIT,
 140                                          &key, sizeof(key),
 141                                          &brw->clip.prog_bo, 1,
 142                                          NULL);
 143    if (brw->clip.state_bo == NULL) {
 144       brw->clip.state_bo = clip_unit_create_from_key(brw, &key);
 145    }
 146 }
 147
 148 const struct brw_tracked_state brw_clip_unit = {
 149    .dirty = {
 150       .mesa  = 0,
 151       .brw   = (BRW_NEW_CURBE_OFFSETS |
 152                 BRW_NEW_URB_FENCE),
 153       .cache = CACHE_NEW_CLIP_PROG
 154    },
 155    .prepare = upload_clip_unit,
 156 };