src/gallium/drivers/i965/brw_wm_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_state.h"
  36 #include "brw_defines.h"
  37 #include "brw_wm.h"
  38 #include "brw_debug.h"
  39 #include "brw_pipe_rast.h"
  40
  41 /***********************************************************************
  42  * WM unit - fragment programs and rasterization
  43  */
  44
  45 struct brw_wm_unit_key {
  46    unsigned int total_grf, total_scratch;
  47    unsigned int urb_entry_read_length;
  48    unsigned int curb_entry_read_length;
  49    unsigned int dispatch_grf_start_reg;
  50
  51    unsigned int curbe_offset;
  52    unsigned int urb_size;
  53
  54    unsigned int max_threads;
  55
  56    unsigned int nr_surfaces, sampler_count;
  57    GLboolean uses_depth, computes_depth, uses_kill, has_flow_control;
  58    GLboolean polygon_stipple, stats_wm, line_stipple, offset_enable;
  59    GLfloat offset_units, offset_factor;
  60 };
  61
  62 static void
  63 wm_unit_populate_key(struct brw_context *brw, struct brw_wm_unit_key *key)
  64 {
  65    const struct brw_fragment_shader *fp = brw->curr.fragment_shader;
  66
  67    memset(key, 0, sizeof(*key));
  68
  69    if (BRW_DEBUG & DEBUG_SINGLE_THREAD)
  70       key->max_threads = 1;
  71    else {
  72       /* WM maximum threads is number of EUs times number of threads per EU. */
  73       if (BRW_IS_IGDNG(brw))
  74          key->max_threads = 12 * 6;
  75       else if (BRW_IS_G4X(brw))
  76          key->max_threads = 10 * 5;
  77       else
  78          key->max_threads = 8 * 4;
  79    }
  80
  81    /* CACHE_NEW_WM_PROG */
  82    key->total_grf = brw->wm.prog_data->total_grf;
  83    key->urb_entry_read_length = brw->wm.prog_data->urb_read_length;
  84    key->curb_entry_read_length = brw->wm.prog_data->curb_read_length;
  85    key->dispatch_grf_start_reg = brw->wm.prog_data->first_curbe_grf;
  86    key->total_scratch = align(brw->wm.prog_data->total_scratch, 1024);
  87
  88    /* BRW_NEW_URB_FENCE */
  89    key->urb_size = brw->urb.vsize;
  90
  91    /* BRW_NEW_CURBE_OFFSETS */
  92    key->curbe_offset = brw->curbe.wm_start;
  93
  94    /* BRW_NEW_NR_SURFACEs */
  95    key->nr_surfaces = brw->wm.nr_surfaces;
  96
  97    /* CACHE_NEW_SAMPLER */
  98    key->sampler_count = brw->wm.sampler_count;
  99
 100    /* PIPE_NEW_RAST */
 101    key->polygon_stipple = brw->curr.rast->templ.poly_stipple_enable;
 102
 103    /* PIPE_NEW_FRAGMENT_PROGRAM */
 104    key->uses_depth = fp->uses_depth;
 105    key->computes_depth = fp->info.writes_z;
 106
 107    /* PIPE_NEW_DEPTH_BUFFER
 108     *
 109     * Override for NULL depthbuffer case, required by the Pixel Shader Computed
 110     * Depth field.
 111     */
 112    if (brw->curr.fb.zsbuf == NULL)
 113       key->computes_depth = 0;
 114
 115    /* PIPE_NEW_DEPTH_STENCIL_ALPHA */
 116    key->uses_kill = (fp->info.uses_kill ||
 117                      brw->curr.zstencil->cc3.alpha_test);
 118
 119    key->has_flow_control = fp->has_flow_control;
 120
 121    /* temporary sanity check assertion */
 122    assert(fp->has_flow_control == 0);
 123
 124    /* PIPE_NEW_QUERY */
 125    key->stats_wm = (brw->query.stats_wm != 0);
 126
 127    /* PIPE_NEW_RAST */
 128    key->line_stipple = brw->curr.rast->templ.line_stipple_enable;
 129
 130
 131    key->offset_enable = (brw->curr.rast->templ.offset_cw ||
 132                          brw->curr.rast->templ.offset_ccw);
 133
 134    key->offset_units = brw->curr.rast->templ.offset_units;
 135    key->offset_factor = brw->curr.rast->templ.offset_scale;
 136 }
 137
 138 /**
 139  * Setup wm hardware state.  See page 225 of Volume 2
 140  */
 141 static enum pipe_error
 142 wm_unit_create_from_key(struct brw_context *brw, struct brw_wm_unit_key *key,
 143                         struct brw_winsys_buffer **reloc_bufs,
 144                         struct brw_winsys_buffer **bo_out)
 145 {
 146    struct brw_wm_unit_state wm;
 147    enum pipe_error ret;
 148
 149    memset(&wm, 0, sizeof(wm));
 150
 151    wm.thread0.grf_reg_count = align(key->total_grf, 16) / 16 - 1;
 152    wm.thread0.kernel_start_pointer = 0; /* reloc */
 153    wm.thread1.depth_coef_urb_read_offset = 1;
 154    wm.thread1.floating_point_mode = BRW_FLOATING_POINT_NON_IEEE_754;
 155
 156    if (BRW_IS_IGDNG(brw))
 157       wm.thread1.binding_table_entry_count = 0; /* hardware requirement */
 158    else
 159       wm.thread1.binding_table_entry_count = key->nr_surfaces;
 160
 161    if (key->total_scratch != 0) {
 162       wm.thread2.scratch_space_base_pointer = 0; /* reloc */
 163       wm.thread2.per_thread_scratch_space = key->total_scratch / 1024 - 1;
 164    } else {
 165       wm.thread2.scratch_space_base_pointer = 0;
 166       wm.thread2.per_thread_scratch_space = 0;
 167    }
 168
 169    wm.thread3.dispatch_grf_start_reg = key->dispatch_grf_start_reg;
 170    wm.thread3.urb_entry_read_length = key->urb_entry_read_length;
 171    wm.thread3.urb_entry_read_offset = 0;
 172    wm.thread3.const_urb_entry_read_length = key->curb_entry_read_length;
 173    wm.thread3.const_urb_entry_read_offset = key->curbe_offset * 2;
 174
 175    if (BRW_IS_IGDNG(brw))
 176       wm.wm4.sampler_count = 0; /* hardware requirement */
 177    else
 178       wm.wm4.sampler_count = (key->sampler_count + 1) / 4;
 179
 180    /* reloc */
 181    wm.wm4.sampler_state_pointer = 0;
 182
 183    wm.wm5.program_uses_depth = key->uses_depth;
 184    wm.wm5.program_computes_depth = key->computes_depth;
 185    wm.wm5.program_uses_killpixel = key->uses_kill;
 186
 187    if (key->has_flow_control)
 188       wm.wm5.enable_8_pix = 1;
 189    else
 190       wm.wm5.enable_16_pix = 1;
 191
 192    wm.wm5.max_threads = key->max_threads - 1;
 193    wm.wm5.thread_dispatch_enable = 1;   /* AKA: color_write */
 194    wm.wm5.legacy_line_rast = 0;
 195    wm.wm5.legacy_global_depth_bias = 0;
 196    wm.wm5.early_depth_test = 1;         /* never need to disable */
 197    wm.wm5.line_aa_region_width = 0;
 198    wm.wm5.line_endcap_aa_region_width = 1;
 199
 200    wm.wm5.polygon_stipple = key->polygon_stipple;
 201
 202    if (key->offset_enable) {
 203       wm.wm5.depth_offset = 1;
 204       /* Something wierd going on with legacy_global_depth_bias,
 205        * offset_constant, scaling and MRD.  This value passes glean
 206        * but gives some odd results elsewere (eg. the
 207        * quad-offset-units test).
 208        */
 209       wm.global_depth_offset_constant = key->offset_units * 2;
 210
 211       /* This is the only value that passes glean:
 212        */
 213       wm.global_depth_offset_scale = key->offset_factor;
 214    }
 215
 216    wm.wm5.line_stipple = key->line_stipple;
 217
 218    if (BRW_DEBUG & DEBUG_STATS || key->stats_wm)
 219       wm.wm4.stats_enable = 1;
 220
 221    ret = brw_upload_cache(&brw->cache, BRW_WM_UNIT,
 222                           key, sizeof(*key),
 223                           reloc_bufs, 3,
 224                           &wm, sizeof(wm),
 225                           NULL, NULL,
 226                           bo_out);
 227    if (ret)
 228       return ret;
 229
 230    /* Emit WM program relocation */
 231    ret = brw->sws->bo_emit_reloc(*bo_out,
 232                                  BRW_USAGE_STATE,
 233                                  wm.thread0.grf_reg_count << 1,
 234                                  offsetof(struct brw_wm_unit_state, thread0),
 235                                  brw->wm.prog_bo);
 236    if (ret)
 237       return ret;
 238
 239    /* Emit scratch space relocation */
 240    if (key->total_scratch != 0) {
 241       ret = brw->sws->bo_emit_reloc(*bo_out,
 242                                     BRW_USAGE_SCRATCH,
 243                                     wm.thread2.per_thread_scratch_space,
 244                                     offsetof(struct brw_wm_unit_state, thread2),
 245                                     brw->wm.scratch_bo);
 246       if (ret)
 247          return ret;
 248    }
 249
 250    /* Emit sampler state relocation */
 251    if (key->sampler_count != 0) {
 252       ret = brw->sws->bo_emit_reloc(*bo_out,
 253                                     BRW_USAGE_STATE,
 254                                     wm.wm4.stats_enable | (wm.wm4.sampler_count << 2),
 255                                     offsetof(struct brw_wm_unit_state, wm4),
 256                                     brw->wm.sampler_bo);
 257       if (ret)
 258          return ret;
 259    }
 260
 261    return PIPE_OK;
 262 }
 263
 264
 265 static enum pipe_error upload_wm_unit( struct brw_context *brw )
 266 {
 267    struct brw_wm_unit_key key;
 268    struct brw_winsys_buffer *reloc_bufs[3];
 269    enum pipe_error ret;
 270
 271    wm_unit_populate_key(brw, &key);
 272
 273    /* Allocate the necessary scratch space if we haven't already.  Don't
 274     * bother reducing the allocation later, since we use scratch so
 275     * rarely.
 276     */
 277    assert(key.total_scratch <= 12 * 1024);
 278    if (key.total_scratch) {
 279       GLuint total = key.total_scratch * key.max_threads;
 280
 281       /* Do we need a new buffer:
 282        */
 283       if (brw->wm.scratch_bo && total > brw->wm.scratch_bo->size)
 284          bo_reference(&brw->wm.scratch_bo, NULL);
 285
 286       if (brw->wm.scratch_bo == NULL) {
 287          ret = brw->sws->bo_alloc(brw->sws,
 288                                   BRW_BUFFER_TYPE_SHADER_SCRATCH,
 289                                   total,
 290                                   4096,
 291                                   &brw->wm.scratch_bo);
 292          if (ret)
 293             return ret;
 294       }
 295    }
 296
 297    reloc_bufs[0] = brw->wm.prog_bo;
 298    reloc_bufs[1] = brw->wm.scratch_bo;
 299    reloc_bufs[2] = brw->wm.sampler_bo;
 300
 301    if (brw_search_cache(&brw->cache, BRW_WM_UNIT,
 302                         &key, sizeof(key),
 303                         reloc_bufs, 3,
 304                         NULL,
 305                         &brw->wm.state_bo))
 306       return PIPE_OK;
 307
 308    ret = wm_unit_create_from_key(brw, &key, reloc_bufs,
 309                                  &brw->wm.state_bo);
 310    if (ret)
 311       return ret;
 312
 313    return PIPE_OK;
 314 }
 315
 316 const struct brw_tracked_state brw_wm_unit = {
 317    .dirty = {
 318       .mesa = (PIPE_NEW_FRAGMENT_SHADER |
 319                PIPE_NEW_DEPTH_BUFFER |
 320                PIPE_NEW_RAST |
 321                PIPE_NEW_DEPTH_STENCIL_ALPHA |
 322                PIPE_NEW_QUERY),
 323
 324       .brw = (BRW_NEW_CURBE_OFFSETS |
 325               BRW_NEW_NR_WM_SURFACES),
 326
 327       .cache = (CACHE_NEW_WM_PROG |
 328                 CACHE_NEW_SAMPLER)
 329    },
 330    .prepare = upload_wm_unit,
 331 };
 332