src/mesa/drivers/dri/i965/brw_vs_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
  33
  34 #include "brw_context.h"
  35 #include "brw_state.h"
  36 #include "brw_defines.h"
  37 #include "main/macros.h"
  38
  39 struct brw_vs_unit_key {
  40    unsigned int total_grf;
  41    unsigned int urb_entry_read_length;
  42    unsigned int curb_entry_read_length;
  43
  44    unsigned int curbe_offset;
  45
  46    unsigned int nr_urb_entries, urb_size;
  47
  48    unsigned int nr_surfaces;
  49 };
  50
  51 static void
  52 vs_unit_populate_key(struct brw_context *brw, struct brw_vs_unit_key *key)
  53 {
  54    GLcontext *ctx = &brw->intel.ctx;
  55
  56    memset(key, 0, sizeof(*key));
  57
  58    /* CACHE_NEW_VS_PROG */
  59    key->total_grf = brw->vs.prog_data->total_grf;
  60    key->urb_entry_read_length = brw->vs.prog_data->urb_read_length;
  61    key->curb_entry_read_length = brw->vs.prog_data->curb_read_length;
  62
  63    /* BRW_NEW_URB_FENCE */
  64    key->nr_urb_entries = brw->urb.nr_vs_entries;
  65    key->urb_size = brw->urb.vsize;
  66
  67    /* BRW_NEW_NR_VS_SURFACES */
  68    key->nr_surfaces = brw->vs.nr_surfaces;
  69
  70    /* BRW_NEW_CURBE_OFFSETS, _NEW_TRANSFORM */
  71    if (ctx->Transform.ClipPlanesEnabled) {
  72       /* Note that we read in the userclip planes as well, hence
  73        * clip_start:
  74        */
  75       key->curbe_offset = brw->curbe.clip_start;
  76    }
  77    else {
  78       key->curbe_offset = brw->curbe.vs_start;
  79    }
  80 }
  81
  82 static dri_bo *
  83 vs_unit_create_from_key(struct brw_context *brw, struct brw_vs_unit_key *key)
  84 {
  85    struct brw_vs_unit_state vs;
  86    dri_bo *bo;
  87    int chipset_max_threads;
  88
  89    memset(&vs, 0, sizeof(vs));
  90
  91    vs.thread0.kernel_start_pointer = brw->vs.prog_bo->offset >> 6; /* reloc */
  92    vs.thread0.grf_reg_count = ALIGN(key->total_grf, 16) / 16 - 1;
  93    vs.thread1.floating_point_mode = BRW_FLOATING_POINT_NON_IEEE_754;
  94    /* Choosing multiple program flow means that we may get 2-vertex threads,
  95     * which will have the channel mask for dwords 4-7 enabled in the thread,
  96     * and those dwords will be written to the second URB handle when we
  97     * brw_urb_WRITE() results.
  98     */
  99    vs.thread1.single_program_flow = 0;
 100    vs.thread1.binding_table_entry_count = key->nr_surfaces;
 101
 102    vs.thread3.urb_entry_read_length = key->urb_entry_read_length;
 103    vs.thread3.const_urb_entry_read_length = key->curb_entry_read_length;
 104    vs.thread3.dispatch_grf_start_reg = 1;
 105    vs.thread3.urb_entry_read_offset = 0;
 106    vs.thread3.const_urb_entry_read_offset = key->curbe_offset * 2;
 107
 108    vs.thread4.nr_urb_entries = key->nr_urb_entries;
 109    vs.thread4.urb_entry_allocation_size = key->urb_size - 1;
 110
 111    if (BRW_IS_G4X(brw))
 112       chipset_max_threads = 32;
 113    else
 114       chipset_max_threads = 16;
 115    vs.thread4.max_threads = CLAMP(key->nr_urb_entries / 2,
 116                                   1, chipset_max_threads) - 1;
 117
 118    if (INTEL_DEBUG & DEBUG_SINGLE_THREAD)
 119       vs.thread4.max_threads = 0;
 120
 121    /* No samplers for ARB_vp programs:
 122     */
 123    vs.vs5.sampler_count = 0;
 124
 125    if (INTEL_DEBUG & DEBUG_STATS)
 126       vs.thread4.stats_enable = 1;
 127
 128    /* Vertex program always enabled:
 129     */
 130    vs.vs6.vs_enable = 1;
 131
 132    bo = brw_upload_cache(&brw->cache, BRW_VS_UNIT,
 133                          key, sizeof(*key),
 134                          &brw->vs.prog_bo, 1,
 135                          &vs, sizeof(vs),
 136                          NULL, NULL);
 137
 138    /* Emit VS program relocation */
 139    dri_bo_emit_reloc(bo,
 140                      I915_GEM_DOMAIN_INSTRUCTION, 0,
 141                      vs.thread0.grf_reg_count << 1,
 142                      offsetof(struct brw_vs_unit_state, thread0),
 143                      brw->vs.prog_bo);
 144
 145    return bo;
 146 }
 147
 148 static void prepare_vs_unit(struct brw_context *brw)
 149 {
 150    struct brw_vs_unit_key key;
 151
 152    vs_unit_populate_key(brw, &key);
 153
 154    dri_bo_unreference(brw->vs.state_bo);
 155    brw->vs.state_bo = brw_search_cache(&brw->cache, BRW_VS_UNIT,
 156                                        &key, sizeof(key),
 157                                        &brw->vs.prog_bo, 1,
 158                                        NULL);
 159    if (brw->vs.state_bo == NULL) {
 160       brw->vs.state_bo = vs_unit_create_from_key(brw, &key);
 161    }
 162 }
 163
 164 const struct brw_tracked_state brw_vs_unit = {
 165    .dirty = {
 166       .mesa  = _NEW_TRANSFORM,
 167       .brw   = (BRW_NEW_CURBE_OFFSETS |
 168                 BRW_NEW_NR_VS_SURFACES |
 169                 BRW_NEW_URB_FENCE),
 170       .cache = CACHE_NEW_VS_PROG
 171    },
 172    .prepare = prepare_vs_unit,
 173 };