src/mesa/drivers/dri/i965/brw_sf_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 static void upload_sf_vp(struct brw_context *brw)
  40 {
  41    GLcontext *ctx = &brw->intel.ctx;
  42    const GLfloat depth_scale = 1.0F / ctx->DrawBuffer->_DepthMaxF;
  43    struct brw_sf_viewport sfv;
  44    GLfloat y_scale, y_bias;
  45    const GLboolean render_to_fbo = (ctx->DrawBuffer->Name != 0);
  46    const GLfloat *v = ctx->Viewport._WindowMap.m;
  47
  48    memset(&sfv, 0, sizeof(sfv));
  49
  50    if (render_to_fbo) {
  51       y_scale = 1.0;
  52       y_bias = 0;
  53    }
  54    else {
  55       y_scale = -1.0;
  56       y_bias = ctx->DrawBuffer->Height;
  57    }
  58
  59    /* _NEW_VIEWPORT */
  60
  61    sfv.viewport.m00 = v[MAT_SX];
  62    sfv.viewport.m11 = v[MAT_SY] * y_scale;
  63    sfv.viewport.m22 = v[MAT_SZ] * depth_scale;
  64    sfv.viewport.m30 = v[MAT_TX];
  65    sfv.viewport.m31 = v[MAT_TY] * y_scale + y_bias;
  66    sfv.viewport.m32 = v[MAT_TZ] * depth_scale;
  67
  68    /* _NEW_SCISSOR | _NEW_BUFFERS | _NEW_VIEWPORT
  69     * for DrawBuffer->_[XY]{min,max}
  70     */
  71
  72    /* The scissor only needs to handle the intersection of drawable
  73     * and scissor rect, since there are no longer cliprects for shared
  74     * buffers with DRI2.
  75     *
  76     * Note that the hardware's coordinates are inclusive, while Mesa's min is
  77     * inclusive but max is exclusive.
  78     */
  79
  80    if (ctx->DrawBuffer->_Xmin == ctx->DrawBuffer->_Xmax ||
  81        ctx->DrawBuffer->_Ymin == ctx->DrawBuffer->_Ymax) {
  82       /* If the scissor was out of bounds and got clamped to 0
  83        * width/height at the bounds, the subtraction of 1 from
  84        * maximums could produce a negative number and thus not clip
  85        * anything.  Instead, just provide a min > max scissor inside
  86        * the bounds, which produces the expected no rendering.
  87        */
  88       sfv.scissor.xmin = 1;
  89       sfv.scissor.xmax = 0;
  90       sfv.scissor.ymin = 1;
  91       sfv.scissor.ymax = 0;
  92    } else if (render_to_fbo) {
  93       /* texmemory: Y=0=bottom */
  94       sfv.scissor.xmin = ctx->DrawBuffer->_Xmin;
  95       sfv.scissor.xmax = ctx->DrawBuffer->_Xmax - 1;
  96       sfv.scissor.ymin = ctx->DrawBuffer->_Ymin;
  97       sfv.scissor.ymax = ctx->DrawBuffer->_Ymax - 1;
  98    }
  99    else {
 100       /* memory: Y=0=top */
 101       sfv.scissor.xmin = ctx->DrawBuffer->_Xmin;
 102       sfv.scissor.xmax = ctx->DrawBuffer->_Xmax - 1;
 103       sfv.scissor.ymin = ctx->DrawBuffer->Height - ctx->DrawBuffer->_Ymax;
 104       sfv.scissor.ymax = ctx->DrawBuffer->Height - ctx->DrawBuffer->_Ymin - 1;
 105    }
 106
 107    dri_bo_unreference(brw->sf.vp_bo);
 108    brw->sf.vp_bo = brw_cache_data(&brw->cache, BRW_SF_VP, &sfv, sizeof(sfv),
 109                                   NULL, 0);
 110 }
 111
 112 const struct brw_tracked_state brw_sf_vp = {
 113    .dirty = {
 114       .mesa  = (_NEW_VIEWPORT |
 115                 _NEW_SCISSOR |
 116                 _NEW_BUFFERS),
 117       .brw   = 0,
 118       .cache = 0
 119    },
 120    .prepare = upload_sf_vp
 121 };
 122
 123 struct brw_sf_unit_key {
 124    unsigned int total_grf;
 125    unsigned int urb_entry_read_length;
 126
 127    unsigned int nr_urb_entries, urb_size, sfsize;
 128
 129    GLenum front_face, cull_face;
 130    unsigned pv_first:1;
 131    unsigned scissor:1;
 132    unsigned line_smooth:1;
 133    unsigned point_sprite:1;
 134    unsigned point_attenuated:1;
 135    unsigned render_to_fbo:1;
 136    float line_width;
 137    float point_size;
 138 };
 139
 140 static void
 141 sf_unit_populate_key(struct brw_context *brw, struct brw_sf_unit_key *key)
 142 {
 143    GLcontext *ctx = &brw->intel.ctx;
 144    memset(key, 0, sizeof(*key));
 145
 146    /* CACHE_NEW_SF_PROG */
 147    key->total_grf = brw->sf.prog_data->total_grf;
 148    key->urb_entry_read_length = brw->sf.prog_data->urb_read_length;
 149
 150    /* BRW_NEW_URB_FENCE */
 151    key->nr_urb_entries = brw->urb.nr_sf_entries;
 152    key->urb_size = brw->urb.vsize;
 153    key->sfsize = brw->urb.sfsize;
 154
 155    key->scissor = ctx->Scissor.Enabled;
 156    key->front_face = ctx->Polygon.FrontFace;
 157
 158    if (ctx->Polygon.CullFlag)
 159       key->cull_face = ctx->Polygon.CullFaceMode;
 160    else
 161       key->cull_face = GL_NONE;
 162
 163    key->line_width = ctx->Line.Width;
 164    key->line_smooth = ctx->Line.SmoothFlag;
 165
 166    key->point_sprite = ctx->Point.PointSprite;
 167    key->point_size = CLAMP(ctx->Point.Size, ctx->Point.MinSize, ctx->Point.MaxSize);
 168    key->point_attenuated = ctx->Point._Attenuated;
 169
 170    /* _NEW_LIGHT */
 171    key->pv_first = (ctx->Light.ProvokingVertex == GL_FIRST_VERTEX_CONVENTION);
 172
 173    key->render_to_fbo = brw->intel.ctx.DrawBuffer->Name != 0;
 174 }
 175
 176 static dri_bo *
 177 sf_unit_create_from_key(struct brw_context *brw, struct brw_sf_unit_key *key,
 178                         dri_bo **reloc_bufs)
 179 {
 180    struct intel_context *intel = &brw->intel;
 181    struct brw_sf_unit_state sf;
 182    dri_bo *bo;
 183    int chipset_max_threads;
 184    memset(&sf, 0, sizeof(sf));
 185
 186    sf.thread0.grf_reg_count = ALIGN(key->total_grf, 16) / 16 - 1;
 187    sf.thread0.kernel_start_pointer = brw->sf.prog_bo->offset >> 6; /* reloc */
 188
 189    sf.thread1.floating_point_mode = BRW_FLOATING_POINT_NON_IEEE_754;
 190
 191    sf.thread3.dispatch_grf_start_reg = 3;
 192
 193    if (intel->gen == 5)
 194        sf.thread3.urb_entry_read_offset = 3;
 195    else
 196        sf.thread3.urb_entry_read_offset = 1;
 197
 198    sf.thread3.urb_entry_read_length = key->urb_entry_read_length;
 199
 200    sf.thread4.nr_urb_entries = key->nr_urb_entries;
 201    sf.thread4.urb_entry_allocation_size = key->sfsize - 1;
 202
 203    /* Each SF thread produces 1 PUE, and there can be up to 24 (Pre-Ironlake) or
 204     * 48 (Ironlake) threads.
 205     */
 206    if (intel->gen == 5)
 207       chipset_max_threads = 48;
 208    else
 209       chipset_max_threads = 24;
 210
 211    sf.thread4.max_threads = MIN2(chipset_max_threads, key->nr_urb_entries) - 1;
 212
 213    if (INTEL_DEBUG & DEBUG_SINGLE_THREAD)
 214       sf.thread4.max_threads = 0;
 215
 216    if (INTEL_DEBUG & DEBUG_STATS)
 217       sf.thread4.stats_enable = 1;
 218
 219    /* CACHE_NEW_SF_VP */
 220    sf.sf5.sf_viewport_state_offset = brw->sf.vp_bo->offset >> 5; /* reloc */
 221
 222    sf.sf5.viewport_transform = 1;
 223
 224    /* _NEW_SCISSOR */
 225    if (key->scissor)
 226       sf.sf6.scissor = 1;
 227
 228    /* _NEW_POLYGON */
 229    if (key->front_face == GL_CCW)
 230       sf.sf5.front_winding = BRW_FRONTWINDING_CCW;
 231    else
 232       sf.sf5.front_winding = BRW_FRONTWINDING_CW;
 233
 234    /* The viewport is inverted for rendering to a FBO, and that inverts
 235     * polygon front/back orientation.
 236     */
 237    sf.sf5.front_winding ^= key->render_to_fbo;
 238
 239    switch (key->cull_face) {
 240    case GL_FRONT:
 241       sf.sf6.cull_mode = BRW_CULLMODE_FRONT;
 242       break;
 243    case GL_BACK:
 244       sf.sf6.cull_mode = BRW_CULLMODE_BACK;
 245       break;
 246    case GL_FRONT_AND_BACK:
 247       sf.sf6.cull_mode = BRW_CULLMODE_BOTH;
 248       break;
 249    case GL_NONE:
 250       sf.sf6.cull_mode = BRW_CULLMODE_NONE;
 251       break;
 252    default:
 253       assert(0);
 254       break;
 255    }
 256
 257    /* _NEW_LINE */
 258    /* XXX use ctx->Const.Min/MaxLineWidth here */
 259    sf.sf6.line_width = CLAMP(key->line_width, 1.0, 5.0) * (1<<1);
 260
 261    sf.sf6.line_endcap_aa_region_width = 1;
 262    if (key->line_smooth)
 263       sf.sf6.aa_enable = 1;
 264    else if (sf.sf6.line_width <= 0x2)
 265        sf.sf6.line_width = 0;
 266
 267    /* _NEW_BUFFERS */
 268    key->render_to_fbo = brw->intel.ctx.DrawBuffer->Name != 0;
 269    if (!key->render_to_fbo) {
 270       /* Rendering to an OpenGL window */
 271       sf.sf6.point_rast_rule = BRW_RASTRULE_UPPER_RIGHT;
 272    }
 273    else {
 274       /* If rendering to an FBO, the pixel coordinate system is
 275        * inverted with respect to the normal OpenGL coordinate
 276        * system, so BRW_RASTRULE_LOWER_RIGHT is correct.
 277        * But this value is listed as "Reserved, but not seen as useful"
 278        * in Intel documentation (page 212, "Point Rasterization Rule",
 279        * section 7.4 "SF Pipeline State Summary", of document
 280        * "Intel® 965 Express Chipset Family and Intel® G35 Express
 281        * Chipset Graphics Controller Programmer's Reference Manual,
 282        * Volume 2: 3D/Media", Revision 1.0b as of January 2008,
 283        * available at
 284        *     http://intellinuxgraphics.org/documentation.html
 285        * at the time of this writing).
 286        *
 287        * It does work on at least some devices, if not all;
 288        * if devices that don't support it can be identified,
 289        * the likely failure case is that points are rasterized
 290        * incorrectly, which is no worse than occurs without
 291        * the value, so we're using it here.
 292        */
 293       sf.sf6.point_rast_rule = BRW_RASTRULE_LOWER_RIGHT;
 294    }
 295    /* XXX clamp max depends on AA vs. non-AA */
 296
 297    /* _NEW_POINT */
 298    sf.sf7.sprite_point = key->point_sprite;
 299    sf.sf7.point_size = CLAMP(rint(key->point_size), 1, 255) * (1<<3);
 300    sf.sf7.use_point_size_state = !key->point_attenuated;
 301    sf.sf7.aa_line_distance_mode = 0;
 302
 303    /* might be BRW_NEW_PRIMITIVE if we have to adjust pv for polygons:
 304     */
 305    if (!key->pv_first) {
 306       sf.sf7.trifan_pv = 2;
 307       sf.sf7.linestrip_pv = 1;
 308       sf.sf7.tristrip_pv = 2;
 309    } else {
 310       sf.sf7.trifan_pv = 1;
 311       sf.sf7.linestrip_pv = 0;
 312       sf.sf7.tristrip_pv = 0;
 313    }
 314    sf.sf7.line_last_pixel_enable = 0;
 315
 316    /* Set bias for OpenGL rasterization rules:
 317     */
 318    sf.sf6.dest_org_vbias = 0x8;
 319    sf.sf6.dest_org_hbias = 0x8;
 320
 321    bo = brw_upload_cache(&brw->cache, BRW_SF_UNIT,
 322                          key, sizeof(*key),
 323                          reloc_bufs, 2,
 324                          &sf, sizeof(sf));
 325
 326    /* STATE_PREFETCH command description describes this state as being
 327     * something loaded through the GPE (L2 ISC), so it's INSTRUCTION domain.
 328     */
 329    /* Emit SF program relocation */
 330    dri_bo_emit_reloc(bo,
 331                      I915_GEM_DOMAIN_INSTRUCTION, 0,
 332                      sf.thread0.grf_reg_count << 1,
 333                      offsetof(struct brw_sf_unit_state, thread0),
 334                      brw->sf.prog_bo);
 335
 336    /* Emit SF viewport relocation */
 337    dri_bo_emit_reloc(bo,
 338                      I915_GEM_DOMAIN_INSTRUCTION, 0,
 339                      sf.sf5.front_winding | (sf.sf5.viewport_transform << 1),
 340                      offsetof(struct brw_sf_unit_state, sf5),
 341                      brw->sf.vp_bo);
 342
 343    return bo;
 344 }
 345
 346 static void upload_sf_unit( struct brw_context *brw )
 347 {
 348    struct brw_sf_unit_key key;
 349    dri_bo *reloc_bufs[2];
 350
 351    sf_unit_populate_key(brw, &key);
 352
 353    reloc_bufs[0] = brw->sf.prog_bo;
 354    reloc_bufs[1] = brw->sf.vp_bo;
 355
 356    dri_bo_unreference(brw->sf.state_bo);
 357    brw->sf.state_bo = brw_search_cache(&brw->cache, BRW_SF_UNIT,
 358                                        &key, sizeof(key),
 359                                        reloc_bufs, 2,
 360                                        NULL);
 361    if (brw->sf.state_bo == NULL) {
 362       brw->sf.state_bo = sf_unit_create_from_key(brw, &key, reloc_bufs);
 363    }
 364 }
 365
 366 const struct brw_tracked_state brw_sf_unit = {
 367    .dirty = {
 368       .mesa  = (_NEW_POLYGON |
 369                 _NEW_LIGHT |
 370                 _NEW_LINE |
 371                 _NEW_POINT |
 372                 _NEW_SCISSOR |
 373                 _NEW_BUFFERS),
 374       .brw   = BRW_NEW_URB_FENCE,
 375       .cache = (CACHE_NEW_SF_VP |
 376                 CACHE_NEW_SF_PROG)
 377    },
 378    .prepare = upload_sf_unit,
 379 };