src/mesa/drivers/dri/i965/brw_curbe.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 "main/glheader.h"
  35 #include "main/context.h"
  36 #include "main/macros.h"
  37 #include "main/enums.h"
  38 #include "shader/prog_parameter.h"
  39 #include "shader/prog_statevars.h"
  40 #include "intel_batchbuffer.h"
  41 #include "intel_regions.h"
  42 #include "brw_context.h"
  43 #include "brw_defines.h"
  44 #include "brw_state.h"
  45 #include "brw_util.h"
  46
  47
  48 /**
  49  * Partition the CURBE between the various users of constant values:
  50  * Note that vertex and fragment shaders can now fetch constants out
  51  * of constant buffers.  We no longer allocatea block of the GRF for
  52  * constants.  That greatly reduces the demand for space in the CURBE.
  53  * Some of the comments within are dated...
  54  */
  55 static void calculate_curbe_offsets( struct brw_context *brw )
  56 {
  57    GLcontext *ctx = &brw->intel.ctx;
  58    /* CACHE_NEW_WM_PROG */
  59    const GLuint nr_fp_regs = (brw->wm.prog_data->nr_params + 15) / 16;
  60
  61    /* BRW_NEW_VERTEX_PROGRAM */
  62    const GLuint nr_vp_regs = (brw->vs.prog_data->nr_params + 15) / 16;
  63    GLuint nr_clip_regs = 0;
  64    GLuint total_regs;
  65
  66    /* _NEW_TRANSFORM */
  67    if (ctx->Transform.ClipPlanesEnabled) {
  68       GLuint nr_planes = 6 + brw_count_bits(ctx->Transform.ClipPlanesEnabled);
  69       nr_clip_regs = (nr_planes * 4 + 15) / 16;
  70    }
  71
  72
  73    total_regs = nr_fp_regs + nr_vp_regs + nr_clip_regs;
  74
  75    /* This can happen - what to do?  Probably rather than falling
  76     * back, the best thing to do is emit programs which code the
  77     * constants as immediate values.  Could do this either as a static
  78     * cap on WM and VS, or adaptively.
  79     *
  80     * Unfortunately, this is currently dependent on the results of the
  81     * program generation process (in the case of wm), so this would
  82     * introduce the need to re-generate programs in the event of a
  83     * curbe allocation failure.
  84     */
  85    /* Max size is 32 - just large enough to
  86     * hold the 128 parameters allowed by
  87     * the fragment and vertex program
  88     * api's.  It's not clear what happens
  89     * when both VP and FP want to use 128
  90     * parameters, though.
  91     */
  92    assert(total_regs <= 32);
  93
  94    /* Lazy resize:
  95     */
  96    if (nr_fp_regs > brw->curbe.wm_size ||
  97        nr_vp_regs > brw->curbe.vs_size ||
  98        nr_clip_regs != brw->curbe.clip_size ||
  99        (total_regs < brw->curbe.total_size / 4 &&
 100         brw->curbe.total_size > 16)) {
 101
 102       GLuint reg = 0;
 103
 104       /* Calculate a new layout:
 105        */
 106       reg = 0;
 107       brw->curbe.wm_start = reg;
 108       brw->curbe.wm_size = nr_fp_regs; reg += nr_fp_regs;
 109       brw->curbe.clip_start = reg;
 110       brw->curbe.clip_size = nr_clip_regs; reg += nr_clip_regs;
 111       brw->curbe.vs_start = reg;
 112       brw->curbe.vs_size = nr_vp_regs; reg += nr_vp_regs;
 113       brw->curbe.total_size = reg;
 114
 115       if (0)
 116          _mesa_printf("curbe wm %d+%d clip %d+%d vs %d+%d\n",
 117                       brw->curbe.wm_start,
 118                       brw->curbe.wm_size,
 119                       brw->curbe.clip_start,
 120                       brw->curbe.clip_size,
 121                       brw->curbe.vs_start,
 122                       brw->curbe.vs_size );
 123
 124       brw->state.dirty.brw |= BRW_NEW_CURBE_OFFSETS;
 125    }
 126 }
 127
 128
 129 const struct brw_tracked_state brw_curbe_offsets = {
 130    .dirty = {
 131       .mesa = _NEW_TRANSFORM,
 132       .brw  = BRW_NEW_VERTEX_PROGRAM,
 133       .cache = CACHE_NEW_WM_PROG
 134    },
 135    .prepare = calculate_curbe_offsets
 136 };
 137
 138
 139
 140
 141 /* Define the number of curbes within CS's urb allocation.  Multiple
 142  * urb entries -> multiple curbes.  These will be used by
 143  * fixed-function hardware in a double-buffering scheme to avoid a
 144  * pipeline stall each time the contents of the curbe is changed.
 145  */
 146 void brw_upload_cs_urb_state(struct brw_context *brw)
 147 {
 148    struct brw_cs_urb_state cs_urb;
 149    memset(&cs_urb, 0, sizeof(cs_urb));
 150
 151    /* It appears that this is the state packet for the CS unit, ie. the
 152     * urb entries detailed here are housed in the CS range from the
 153     * URB_FENCE command.
 154     */
 155    cs_urb.header.opcode = CMD_CS_URB_STATE;
 156    cs_urb.header.length = sizeof(cs_urb)/4 - 2;
 157
 158    /* BRW_NEW_URB_FENCE */
 159    cs_urb.bits0.nr_urb_entries = brw->urb.nr_cs_entries;
 160    cs_urb.bits0.urb_entry_size = brw->urb.csize - 1;
 161
 162    assert(brw->urb.nr_cs_entries);
 163    BRW_CACHED_BATCH_STRUCT(brw, &cs_urb);
 164 }
 165
 166 static GLfloat fixed_plane[6][4] = {
 167    { 0,    0,   -1, 1 },
 168    { 0,    0,    1, 1 },
 169    { 0,   -1,    0, 1 },
 170    { 0,    1,    0, 1 },
 171    {-1,    0,    0, 1 },
 172    { 1,    0,    0, 1 }
 173 };
 174
 175 /* Upload a new set of constants.  Too much variability to go into the
 176  * cache mechanism, but maybe would benefit from a comparison against
 177  * the current uploaded set of constants.
 178  */
 179 static void prepare_constant_buffer(struct brw_context *brw)
 180 {
 181    GLcontext *ctx = &brw->intel.ctx;
 182    const struct brw_vertex_program *vp =
 183       brw_vertex_program_const(brw->vertex_program);
 184    const struct brw_fragment_program *fp =
 185       brw_fragment_program_const(brw->fragment_program);
 186    const GLuint sz = brw->curbe.total_size;
 187    const GLuint bufsz = sz * 16 * sizeof(GLfloat);
 188    GLfloat *buf;
 189    GLuint i;
 190
 191    /* Update our own dependency flags.  This works because this
 192     * function will also be called whenever fp or vp changes.
 193     */
 194    brw->curbe.tracked_state.dirty.mesa = (_NEW_TRANSFORM|_NEW_PROJECTION);
 195    brw->curbe.tracked_state.dirty.mesa |= vp->program.Base.Parameters->StateFlags;
 196    brw->curbe.tracked_state.dirty.mesa |= fp->program.Base.Parameters->StateFlags;
 197
 198    if (sz == 0) {
 199       if (brw->curbe.last_buf) {
 200          free(brw->curbe.last_buf);
 201          brw->curbe.last_buf = NULL;
 202          brw->curbe.last_bufsz  = 0;
 203       }
 204       return;
 205    }
 206
 207    buf = (GLfloat *) _mesa_calloc(bufsz);
 208
 209    /* fragment shader constants */
 210    if (brw->curbe.wm_size) {
 211       GLuint offset = brw->curbe.wm_start * 16;
 212
 213       _mesa_load_state_parameters(ctx, fp->program.Base.Parameters);
 214
 215       /* copy float constants */
 216       for (i = 0; i < brw->wm.prog_data->nr_params; i++)
 217          buf[offset + i] = *brw->wm.prog_data->param[i];
 218    }
 219
 220
 221    /* The clipplanes are actually delivered to both CLIP and VS units.
 222     * VS uses them to calculate the outcode bitmasks.
 223     */
 224    if (brw->curbe.clip_size) {
 225       GLuint offset = brw->curbe.clip_start * 16;
 226       GLuint j;
 227
 228       /* If any planes are going this way, send them all this way:
 229        */
 230       for (i = 0; i < 6; i++) {
 231          buf[offset + i * 4 + 0] = fixed_plane[i][0];
 232          buf[offset + i * 4 + 1] = fixed_plane[i][1];
 233          buf[offset + i * 4 + 2] = fixed_plane[i][2];
 234          buf[offset + i * 4 + 3] = fixed_plane[i][3];
 235       }
 236
 237       /* Clip planes: _NEW_TRANSFORM plus _NEW_PROJECTION to get to
 238        * clip-space:
 239        */
 240       assert(MAX_CLIP_PLANES == 6);
 241       for (j = 0; j < MAX_CLIP_PLANES; j++) {
 242          if (ctx->Transform.ClipPlanesEnabled & (1<<j)) {
 243             buf[offset + i * 4 + 0] = ctx->Transform._ClipUserPlane[j][0];
 244             buf[offset + i * 4 + 1] = ctx->Transform._ClipUserPlane[j][1];
 245             buf[offset + i * 4 + 2] = ctx->Transform._ClipUserPlane[j][2];
 246             buf[offset + i * 4 + 3] = ctx->Transform._ClipUserPlane[j][3];
 247             i++;
 248          }
 249       }
 250    }
 251
 252    /* vertex shader constants */
 253    if (brw->curbe.vs_size) {
 254       GLuint offset = brw->curbe.vs_start * 16;
 255       GLuint nr = brw->vs.prog_data->nr_params / 4;
 256
 257       _mesa_load_state_parameters(ctx, vp->program.Base.Parameters);
 258
 259       /* XXX just use a memcpy here */
 260       for (i = 0; i < nr; i++) {
 261          const GLfloat *value = vp->program.Base.Parameters->ParameterValues[i];
 262          buf[offset + i * 4 + 0] = value[0];
 263          buf[offset + i * 4 + 1] = value[1];
 264          buf[offset + i * 4 + 2] = value[2];
 265          buf[offset + i * 4 + 3] = value[3];
 266       }
 267    }
 268
 269    if (0) {
 270       for (i = 0; i < sz*16; i+=4)
 271          _mesa_printf("curbe %d.%d: %f %f %f %f\n", i/8, i&4,
 272                       buf[i+0], buf[i+1], buf[i+2], buf[i+3]);
 273
 274       _mesa_printf("last_buf %p buf %p sz %d/%d cmp %d\n",
 275                    brw->curbe.last_buf, buf,
 276                    bufsz, brw->curbe.last_bufsz,
 277                    brw->curbe.last_buf ? memcmp(buf, brw->curbe.last_buf, bufsz) : -1);
 278    }
 279
 280    if (brw->curbe.curbe_bo != NULL &&
 281        brw->curbe.last_buf &&
 282        bufsz == brw->curbe.last_bufsz &&
 283        memcmp(buf, brw->curbe.last_buf, bufsz) == 0) {
 284       /* constants have not changed */
 285       _mesa_free(buf);
 286    }
 287    else {
 288       /* constants have changed */
 289       if (brw->curbe.last_buf)
 290          _mesa_free(brw->curbe.last_buf);
 291
 292       brw->curbe.last_buf = buf;
 293       brw->curbe.last_bufsz = bufsz;
 294
 295       if (brw->curbe.curbe_bo != NULL &&
 296           (brw->curbe.need_new_bo ||
 297            brw->curbe.curbe_next_offset + bufsz > brw->curbe.curbe_bo->size))
 298       {
 299          dri_bo_unreference(brw->curbe.curbe_bo);
 300          brw->curbe.curbe_bo = NULL;
 301       }
 302
 303       if (brw->curbe.curbe_bo == NULL) {
 304          /* Allocate a single page for CURBE entries for this batchbuffer.
 305           * They're generally around 64b.
 306           */
 307          brw->curbe.curbe_bo = dri_bo_alloc(brw->intel.bufmgr, "CURBE",
 308                                             4096, 1 << 6);
 309          brw->curbe.curbe_next_offset = 0;
 310       }
 311
 312       brw->curbe.curbe_offset = brw->curbe.curbe_next_offset;
 313       brw->curbe.curbe_next_offset += bufsz;
 314       brw->curbe.curbe_next_offset = ALIGN(brw->curbe.curbe_next_offset, 64);
 315
 316       /* Copy data to the buffer:
 317        */
 318       dri_bo_subdata(brw->curbe.curbe_bo, brw->curbe.curbe_offset, bufsz, buf);
 319    }
 320
 321    brw_add_validated_bo(brw, brw->curbe.curbe_bo);
 322
 323    /* Because this provokes an action (ie copy the constants into the
 324     * URB), it shouldn't be shortcircuited if identical to the
 325     * previous time - because eg. the urb destination may have
 326     * changed, or the urb contents different to last time.
 327     *
 328     * Note that the data referred to is actually copied internally,
 329     * not just used in place according to passed pointer.
 330     *
 331     * It appears that the CS unit takes care of using each available
 332     * URB entry (Const URB Entry == CURBE) in turn, and issuing
 333     * flushes as necessary when doublebuffering of CURBEs isn't
 334     * possible.
 335     */
 336 }
 337
 338
 339 /**
 340  * Copy Mesa program parameters into given constant buffer.
 341  */
 342 static void
 343 update_constant_buffer(struct brw_context *brw,
 344                        const struct gl_program_parameter_list *params,
 345                        dri_bo *const_buffer)
 346 {
 347    struct intel_context *intel = &brw->intel;
 348    const int size = params->NumParameters * 4 * sizeof(GLfloat);
 349
 350    /* copy Mesa program constants into the buffer */
 351    if (const_buffer && size > 0) {
 352
 353       assert(const_buffer);
 354       assert(const_buffer->size >= size);
 355
 356       if (intel->intelScreen->kernel_exec_fencing) {
 357          drm_intel_gem_bo_map_gtt(const_buffer);
 358          memcpy(const_buffer->virtual, params->ParameterValues, size);
 359          drm_intel_gem_bo_unmap_gtt(const_buffer);
 360       }
 361       else {
 362          dri_bo_subdata(const_buffer, 0, size, params->ParameterValues);
 363       }
 364
 365       if (0) {
 366          int i;
 367          for (i = 0; i < params->NumParameters; i++) {
 368             float *p = params->ParameterValues[i];
 369             printf("%d: %f %f %f %f\n", i, p[0], p[1], p[2], p[3]);
 370          }
 371       }
 372    }
 373 }
 374
 375
 376 /** Copy current vertex program's parameters into the constant buffer */
 377 static void
 378 update_vertex_constant_buffer(struct brw_context *brw)
 379 {
 380    struct brw_vertex_program *vp =
 381       (struct brw_vertex_program *) brw->vertex_program;
 382    if (0) {
 383       printf("update VS constants in buffer %p\n", vp->const_buffer);
 384       printf("program %u\n", vp->program.Base.Id);
 385    }
 386    if (vp->use_const_buffer)
 387       update_constant_buffer(brw, vp->program.Base.Parameters, vp->const_buffer);
 388 }
 389
 390
 391 /** Copy current fragment program's parameters into the constant buffer */
 392 static void
 393 update_fragment_constant_buffer(struct brw_context *brw)
 394 {
 395    struct brw_fragment_program *fp =
 396       (struct brw_fragment_program *) brw->fragment_program;
 397    if (fp->use_const_buffer)
 398       update_constant_buffer(brw, fp->program.Base.Parameters, fp->const_buffer);
 399 }
 400
 401
 402 static void emit_constant_buffer(struct brw_context *brw)
 403 {
 404    struct intel_context *intel = &brw->intel;
 405    GLuint sz = brw->curbe.total_size;
 406
 407    update_vertex_constant_buffer(brw);
 408    update_fragment_constant_buffer(brw);
 409
 410    BEGIN_BATCH(2, IGNORE_CLIPRECTS);
 411    if (sz == 0) {
 412       OUT_BATCH((CMD_CONST_BUFFER << 16) | (2 - 2));
 413       OUT_BATCH(0);
 414    } else {
 415       OUT_BATCH((CMD_CONST_BUFFER << 16) | (1 << 8) | (2 - 2));
 416       OUT_RELOC(brw->curbe.curbe_bo,
 417                 I915_GEM_DOMAIN_INSTRUCTION, 0,
 418                 (sz - 1) + brw->curbe.curbe_offset);
 419    }
 420    ADVANCE_BATCH();
 421 }
 422
 423 /* This tracked state is unique in that the state it monitors varies
 424  * dynamically depending on the parameters tracked by the fragment and
 425  * vertex programs.  This is the template used as a starting point,
 426  * each context will maintain a copy of this internally and update as
 427  * required.
 428  */
 429 const struct brw_tracked_state brw_constant_buffer = {
 430    .dirty = {
 431       .mesa = (_NEW_TRANSFORM|_NEW_PROJECTION),      /* plus fp and vp flags */
 432       .brw  = (BRW_NEW_FRAGMENT_PROGRAM |
 433                BRW_NEW_VERTEX_PROGRAM |
 434                BRW_NEW_URB_FENCE | /* Implicit - hardware requires this, not used above */
 435                BRW_NEW_PSP | /* Implicit - hardware requires this, not used above */
 436                BRW_NEW_CURBE_OFFSETS |
 437                BRW_NEW_BATCH),
 438       .cache = (CACHE_NEW_WM_PROG)
 439    },
 440    .prepare = prepare_constant_buffer,
 441    .emit = emit_constant_buffer,
 442 };
 443