src/mesa/drivers/dri/i915/i915_vtbl.c

   1 /**************************************************************************
   2  *
   3  * Copyright 2003 Tungsten Graphics, Inc., Cedar Park, Texas.
   4  * All Rights Reserved.
   5  *
   6  * Permission is hereby granted, free of charge, to any person obtaining a
   7  * 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, sub license, 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 portions
  16  * of the Software.
  17  *
  18  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  19  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  20  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
  21  * IN NO EVENT SHALL TUNGSTEN GRAPHICS AND/OR ITS SUPPLIERS BE LIABLE FOR
  22  * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
  23  * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
  24  * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  25  *
  26  **************************************************************************/
  27
  28
  29
  30 #include "main/glheader.h"
  31 #include "main/mtypes.h"
  32 #include "main/imports.h"
  33 #include "main/macros.h"
  34 #include "main/colormac.h"
  35
  36 #include "tnl/t_context.h"
  37 #include "tnl/t_vertex.h"
  38
  39 #include "intel_batchbuffer.h"
  40 #include "intel_regions.h"
  41 #include "intel_tris.h"
  42 #include "intel_fbo.h"
  43
  44 #include "i915_reg.h"
  45 #include "i915_context.h"
  46
  47 static void
  48 i915_render_prevalidate(struct intel_context *intel)
  49 {
  50    struct i915_context *i915 = i915_context(&intel->ctx);
  51
  52    i915ValidateFragmentProgram(i915);
  53 }
  54
  55 static void
  56 i915_render_start(struct intel_context *intel)
  57 {
  58    intel_prepare_render(intel);
  59 }
  60
  61
  62 static void
  63 i915_reduced_primitive_state(struct intel_context *intel, GLenum rprim)
  64 {
  65    struct i915_context *i915 = i915_context(&intel->ctx);
  66    GLuint st1 = i915->state.Stipple[I915_STPREG_ST1];
  67
  68    st1 &= ~ST1_ENABLE;
  69
  70    switch (rprim) {
  71    case GL_QUADS: /* from RASTERIZE(GL_QUADS) in t_dd_tritemp.h */
  72    case GL_TRIANGLES:
  73       if (intel->ctx.Polygon.StippleFlag && intel->hw_stipple)
  74          st1 |= ST1_ENABLE;
  75       break;
  76    case GL_LINES:
  77    case GL_POINTS:
  78    default:
  79       break;
  80    }
  81
  82    i915->intel.reduced_primitive = rprim;
  83
  84    if (st1 != i915->state.Stipple[I915_STPREG_ST1]) {
  85       INTEL_FIREVERTICES(intel);
  86
  87       I915_STATECHANGE(i915, I915_UPLOAD_STIPPLE);
  88       i915->state.Stipple[I915_STPREG_ST1] = st1;
  89    }
  90 }
  91
  92
  93 /* Pull apart the vertex format registers and figure out how large a
  94  * vertex is supposed to be.
  95  */
  96 static GLboolean
  97 i915_check_vertex_size(struct intel_context *intel, GLuint expected)
  98 {
  99    struct i915_context *i915 = i915_context(&intel->ctx);
 100    int lis2 = i915->state.Ctx[I915_CTXREG_LIS2];
 101    int lis4 = i915->state.Ctx[I915_CTXREG_LIS4];
 102    int i, sz = 0;
 103
 104    switch (lis4 & S4_VFMT_XYZW_MASK) {
 105    case S4_VFMT_XY:
 106       sz = 2;
 107       break;
 108    case S4_VFMT_XYZ:
 109       sz = 3;
 110       break;
 111    case S4_VFMT_XYW:
 112       sz = 3;
 113       break;
 114    case S4_VFMT_XYZW:
 115       sz = 4;
 116       break;
 117    default:
 118       fprintf(stderr, "no xyzw specified\n");
 119       return 0;
 120    }
 121
 122    if (lis4 & S4_VFMT_SPEC_FOG)
 123       sz++;
 124    if (lis4 & S4_VFMT_COLOR)
 125       sz++;
 126    if (lis4 & S4_VFMT_DEPTH_OFFSET)
 127       sz++;
 128    if (lis4 & S4_VFMT_POINT_WIDTH)
 129       sz++;
 130    if (lis4 & S4_VFMT_FOG_PARAM)
 131       sz++;
 132
 133    for (i = 0; i < 8; i++) {
 134       switch (lis2 & S2_TEXCOORD_FMT0_MASK) {
 135       case TEXCOORDFMT_2D:
 136          sz += 2;
 137          break;
 138       case TEXCOORDFMT_3D:
 139          sz += 3;
 140          break;
 141       case TEXCOORDFMT_4D:
 142          sz += 4;
 143          break;
 144       case TEXCOORDFMT_1D:
 145          sz += 1;
 146          break;
 147       case TEXCOORDFMT_2D_16:
 148          sz += 1;
 149          break;
 150       case TEXCOORDFMT_4D_16:
 151          sz += 2;
 152          break;
 153       case TEXCOORDFMT_NOT_PRESENT:
 154          break;
 155       default:
 156          fprintf(stderr, "bad texcoord fmt %d\n", i);
 157          return GL_FALSE;
 158       }
 159       lis2 >>= S2_TEXCOORD_FMT1_SHIFT;
 160    }
 161
 162    if (sz != expected)
 163       fprintf(stderr, "vertex size mismatch %d/%d\n", sz, expected);
 164
 165    return sz == expected;
 166 }
 167
 168
 169 static void
 170 i915_emit_invarient_state(struct intel_context *intel)
 171 {
 172    BATCH_LOCALS;
 173
 174    BEGIN_BATCH(17);
 175
 176    OUT_BATCH(_3DSTATE_AA_CMD |
 177              AA_LINE_ECAAR_WIDTH_ENABLE |
 178              AA_LINE_ECAAR_WIDTH_1_0 |
 179              AA_LINE_REGION_WIDTH_ENABLE | AA_LINE_REGION_WIDTH_1_0);
 180
 181    OUT_BATCH(_3DSTATE_DFLT_DIFFUSE_CMD);
 182    OUT_BATCH(0);
 183
 184    OUT_BATCH(_3DSTATE_DFLT_SPEC_CMD);
 185    OUT_BATCH(0);
 186
 187    OUT_BATCH(_3DSTATE_DFLT_Z_CMD);
 188    OUT_BATCH(0);
 189
 190    /* Don't support texture crossbar yet */
 191    OUT_BATCH(_3DSTATE_COORD_SET_BINDINGS |
 192              CSB_TCB(0, 0) |
 193              CSB_TCB(1, 1) |
 194              CSB_TCB(2, 2) |
 195              CSB_TCB(3, 3) |
 196              CSB_TCB(4, 4) | CSB_TCB(5, 5) | CSB_TCB(6, 6) | CSB_TCB(7, 7));
 197
 198    /* Need to initialize this to zero.
 199     */
 200    OUT_BATCH(_3DSTATE_LOAD_STATE_IMMEDIATE_1 | I1_LOAD_S(3) | (0));
 201    OUT_BATCH(0);
 202
 203    /* XXX: Use this */
 204    OUT_BATCH(_3DSTATE_SCISSOR_ENABLE_CMD | DISABLE_SCISSOR_RECT);
 205
 206    OUT_BATCH(_3DSTATE_SCISSOR_RECT_0_CMD);
 207    OUT_BATCH(0);
 208    OUT_BATCH(0);
 209
 210    OUT_BATCH(_3DSTATE_DEPTH_SUBRECT_DISABLE);
 211
 212    OUT_BATCH(_3DSTATE_LOAD_INDIRECT | 0);       /* disable indirect state */
 213    OUT_BATCH(0);
 214
 215    ADVANCE_BATCH();
 216 }
 217
 218
 219 #define emit(intel, state, size )                    \
 220    intel_batchbuffer_data(intel->batch, state, size)
 221
 222 static GLuint
 223 get_dirty(struct i915_hw_state *state)
 224 {
 225    GLuint dirty;
 226
 227    /* Workaround the multitex hang - if one texture unit state is
 228     * modified, emit all texture units.
 229     */
 230    dirty = state->active & ~state->emitted;
 231    if (dirty & I915_UPLOAD_TEX_ALL)
 232       state->emitted &= ~I915_UPLOAD_TEX_ALL;
 233    dirty = state->active & ~state->emitted;
 234    return dirty;
 235 }
 236
 237
 238 static GLuint
 239 get_state_size(struct i915_hw_state *state)
 240 {
 241    GLuint dirty = get_dirty(state);
 242    GLuint i;
 243    GLuint sz = 0;
 244
 245    if (dirty & I915_UPLOAD_INVARIENT)
 246       sz += 30 * 4;
 247
 248    if (dirty & I915_UPLOAD_RASTER_RULES)
 249       sz += sizeof(state->RasterRules);
 250
 251    if (dirty & I915_UPLOAD_CTX)
 252       sz += sizeof(state->Ctx);
 253
 254    if (dirty & I915_UPLOAD_BUFFERS)
 255       sz += sizeof(state->Buffer);
 256
 257    if (dirty & I915_UPLOAD_STIPPLE)
 258       sz += sizeof(state->Stipple);
 259
 260    if (dirty & I915_UPLOAD_FOG)
 261       sz += sizeof(state->Fog);
 262
 263    if (dirty & I915_UPLOAD_TEX_ALL) {
 264       int nr = 0;
 265       for (i = 0; i < I915_TEX_UNITS; i++)
 266          if (dirty & I915_UPLOAD_TEX(i))
 267             nr++;
 268
 269       sz += (2 + nr * 3) * sizeof(GLuint) * 2;
 270    }
 271
 272    if (dirty & I915_UPLOAD_CONSTANTS)
 273       sz += state->ConstantSize * sizeof(GLuint);
 274
 275    if (dirty & I915_UPLOAD_PROGRAM)
 276       sz += state->ProgramSize * sizeof(GLuint);
 277
 278    return sz;
 279 }
 280
 281 /* Push the state into the sarea and/or texture memory.
 282  */
 283 static void
 284 i915_emit_state(struct intel_context *intel)
 285 {
 286    struct i915_context *i915 = i915_context(&intel->ctx);
 287    struct i915_hw_state *state = &i915->state;
 288    int i, count, aper_count;
 289    GLuint dirty;
 290    dri_bo *aper_array[3 + I915_TEX_UNITS];
 291    GET_CURRENT_CONTEXT(ctx);
 292    BATCH_LOCALS;
 293
 294    /* We don't hold the lock at this point, so want to make sure that
 295     * there won't be a buffer wrap between the state emits and the primitive
 296     * emit header.
 297     *
 298     * It might be better to talk about explicit places where
 299     * scheduling is allowed, rather than assume that it is whenever a
 300     * batchbuffer fills up.
 301     */
 302    intel_batchbuffer_require_space(intel->batch,
 303                                    get_state_size(state) + INTEL_PRIM_EMIT_SIZE);
 304    count = 0;
 305  again:
 306    aper_count = 0;
 307    dirty = get_dirty(state);
 308
 309    aper_array[aper_count++] = intel->batch->buf;
 310    if (dirty & I915_UPLOAD_BUFFERS) {
 311       aper_array[aper_count++] = state->draw_region->buffer;
 312       if (state->depth_region)
 313          aper_array[aper_count++] = state->depth_region->buffer;
 314    }
 315
 316    if (dirty & I915_UPLOAD_TEX_ALL) {
 317       for (i = 0; i < I915_TEX_UNITS; i++) {
 318          if (dirty & I915_UPLOAD_TEX(i)) {
 319             if (state->tex_buffer[i]) {
 320                aper_array[aper_count++] = state->tex_buffer[i];
 321             }
 322          }
 323       }
 324    }
 325
 326    if (dri_bufmgr_check_aperture_space(aper_array, aper_count)) {
 327        if (count == 0) {
 328            count++;
 329            intel_batchbuffer_flush(intel->batch);
 330            goto again;
 331        } else {
 332            _mesa_error(ctx, GL_OUT_OF_MEMORY, "i915 emit state");
 333            assert(0);
 334        }
 335    }
 336
 337    /* work out list of buffers to emit */
 338
 339    /* Do this here as we may have flushed the batchbuffer above,
 340     * causing more state to be dirty!
 341     */
 342    dirty = get_dirty(state);
 343    state->emitted |= dirty;
 344    assert(get_dirty(state) == 0);
 345
 346    if (INTEL_DEBUG & DEBUG_STATE)
 347       fprintf(stderr, "%s dirty: %x\n", __FUNCTION__, dirty);
 348
 349    if (dirty & I915_UPLOAD_INVARIENT) {
 350       if (INTEL_DEBUG & DEBUG_STATE)
 351          fprintf(stderr, "I915_UPLOAD_INVARIENT:\n");
 352       i915_emit_invarient_state(intel);
 353    }
 354
 355    if (dirty & I915_UPLOAD_RASTER_RULES) {
 356       if (INTEL_DEBUG & DEBUG_STATE)
 357          fprintf(stderr, "I915_UPLOAD_RASTER_RULES:\n");
 358       emit(intel, state->RasterRules, sizeof(state->RasterRules));
 359    }
 360
 361    if (dirty & I915_UPLOAD_CTX) {
 362       if (INTEL_DEBUG & DEBUG_STATE)
 363          fprintf(stderr, "I915_UPLOAD_CTX:\n");
 364
 365       emit(intel, state->Ctx, sizeof(state->Ctx));
 366    }
 367
 368    if (dirty & I915_UPLOAD_BUFFERS) {
 369       GLuint count = 15;
 370
 371       if (INTEL_DEBUG & DEBUG_STATE)
 372          fprintf(stderr, "I915_UPLOAD_BUFFERS:\n");
 373
 374       if (state->depth_region)
 375           count += 3;
 376
 377       BEGIN_BATCH(count);
 378       OUT_BATCH(state->Buffer[I915_DESTREG_CBUFADDR0]);
 379       OUT_BATCH(state->Buffer[I915_DESTREG_CBUFADDR1]);
 380       OUT_RELOC(state->draw_region->buffer,
 381                 I915_GEM_DOMAIN_RENDER, I915_GEM_DOMAIN_RENDER, 0);
 382
 383       if (state->depth_region) {
 384          OUT_BATCH(state->Buffer[I915_DESTREG_DBUFADDR0]);
 385          OUT_BATCH(state->Buffer[I915_DESTREG_DBUFADDR1]);
 386          OUT_RELOC(state->depth_region->buffer,
 387                    I915_GEM_DOMAIN_RENDER, I915_GEM_DOMAIN_RENDER, 0);
 388       }
 389
 390       OUT_BATCH(state->Buffer[I915_DESTREG_DV0]);
 391       OUT_BATCH(state->Buffer[I915_DESTREG_DV1]);
 392       OUT_BATCH(state->Buffer[I915_DESTREG_SENABLE]);
 393       OUT_BATCH(state->Buffer[I915_DESTREG_SR0]);
 394       OUT_BATCH(state->Buffer[I915_DESTREG_SR1]);
 395       OUT_BATCH(state->Buffer[I915_DESTREG_SR2]);
 396
 397       assert(state->Buffer[I915_DESTREG_DRAWRECT0] != MI_NOOP);
 398       OUT_BATCH(state->Buffer[I915_DESTREG_DRAWRECT0]);
 399       OUT_BATCH(state->Buffer[I915_DESTREG_DRAWRECT1]);
 400       OUT_BATCH(state->Buffer[I915_DESTREG_DRAWRECT2]);
 401       OUT_BATCH(state->Buffer[I915_DESTREG_DRAWRECT3]);
 402       OUT_BATCH(state->Buffer[I915_DESTREG_DRAWRECT4]);
 403       OUT_BATCH(state->Buffer[I915_DESTREG_DRAWRECT5]);
 404
 405       ADVANCE_BATCH();
 406    }
 407
 408    if (dirty & I915_UPLOAD_STIPPLE) {
 409       if (INTEL_DEBUG & DEBUG_STATE)
 410          fprintf(stderr, "I915_UPLOAD_STIPPLE:\n");
 411       emit(intel, state->Stipple, sizeof(state->Stipple));
 412    }
 413
 414    if (dirty & I915_UPLOAD_FOG) {
 415       if (INTEL_DEBUG & DEBUG_STATE)
 416          fprintf(stderr, "I915_UPLOAD_FOG:\n");
 417       emit(intel, state->Fog, sizeof(state->Fog));
 418    }
 419
 420    /* Combine all the dirty texture state into a single command to
 421     * avoid lockups on I915 hardware.
 422     */
 423    if (dirty & I915_UPLOAD_TEX_ALL) {
 424       int nr = 0;
 425
 426       for (i = 0; i < I915_TEX_UNITS; i++)
 427          if (dirty & I915_UPLOAD_TEX(i))
 428             nr++;
 429
 430       BEGIN_BATCH(2 + nr * 3);
 431       OUT_BATCH(_3DSTATE_MAP_STATE | (3 * nr));
 432       OUT_BATCH((dirty & I915_UPLOAD_TEX_ALL) >> I915_UPLOAD_TEX_0_SHIFT);
 433       for (i = 0; i < I915_TEX_UNITS; i++)
 434          if (dirty & I915_UPLOAD_TEX(i)) {
 435
 436             if (state->tex_buffer[i]) {
 437                OUT_RELOC(state->tex_buffer[i],
 438                          I915_GEM_DOMAIN_SAMPLER, 0,
 439                          state->tex_offset[i]);
 440             }
 441             else {
 442                OUT_BATCH(state->tex_offset[i]);
 443             }
 444
 445             OUT_BATCH(state->Tex[i][I915_TEXREG_MS3]);
 446             OUT_BATCH(state->Tex[i][I915_TEXREG_MS4]);
 447          }
 448       ADVANCE_BATCH();
 449
 450       BEGIN_BATCH(2 + nr * 3);
 451       OUT_BATCH(_3DSTATE_SAMPLER_STATE | (3 * nr));
 452       OUT_BATCH((dirty & I915_UPLOAD_TEX_ALL) >> I915_UPLOAD_TEX_0_SHIFT);
 453       for (i = 0; i < I915_TEX_UNITS; i++)
 454          if (dirty & I915_UPLOAD_TEX(i)) {
 455             OUT_BATCH(state->Tex[i][I915_TEXREG_SS2]);
 456             OUT_BATCH(state->Tex[i][I915_TEXREG_SS3]);
 457             OUT_BATCH(state->Tex[i][I915_TEXREG_SS4]);
 458          }
 459       ADVANCE_BATCH();
 460    }
 461
 462    if (dirty & I915_UPLOAD_CONSTANTS) {
 463       if (INTEL_DEBUG & DEBUG_STATE)
 464          fprintf(stderr, "I915_UPLOAD_CONSTANTS:\n");
 465       emit(intel, state->Constant, state->ConstantSize * sizeof(GLuint));
 466    }
 467
 468    if (dirty & I915_UPLOAD_PROGRAM) {
 469       if (state->ProgramSize) {
 470          if (INTEL_DEBUG & DEBUG_STATE)
 471             fprintf(stderr, "I915_UPLOAD_PROGRAM:\n");
 472
 473          assert((state->Program[0] & 0x1ff) + 2 == state->ProgramSize);
 474
 475          emit(intel, state->Program, state->ProgramSize * sizeof(GLuint));
 476          if (INTEL_DEBUG & DEBUG_STATE)
 477             i915_disassemble_program(state->Program, state->ProgramSize);
 478       }
 479    }
 480
 481    intel->batch->dirty_state &= ~dirty;
 482    assert(get_dirty(state) == 0);
 483    assert((intel->batch->dirty_state & (1<<1)) == 0);
 484 }
 485
 486 static void
 487 i915_destroy_context(struct intel_context *intel)
 488 {
 489    GLuint i;
 490    struct i915_context *i915 = i915_context(&intel->ctx);
 491
 492    intel_region_release(&i915->state.draw_region);
 493    intel_region_release(&i915->state.depth_region);
 494
 495    for (i = 0; i < I915_TEX_UNITS; i++) {
 496       if (i915->state.tex_buffer[i] != NULL) {
 497          dri_bo_unreference(i915->state.tex_buffer[i]);
 498          i915->state.tex_buffer[i] = NULL;
 499       }
 500    }
 501
 502    _tnl_free_vertices(&intel->ctx);
 503 }
 504
 505 void
 506 i915_set_buf_info_for_region(uint32_t *state, struct intel_region *region,
 507                              uint32_t buffer_id)
 508 {
 509    state[0] = _3DSTATE_BUF_INFO_CMD;
 510    state[1] = buffer_id;
 511
 512    if (region != NULL) {
 513       state[1] |= BUF_3D_PITCH(region->pitch * region->cpp);
 514
 515       if (region->tiling != I915_TILING_NONE) {
 516          state[1] |= BUF_3D_TILED_SURFACE;
 517          if (region->tiling == I915_TILING_Y)
 518             state[1] |= BUF_3D_TILE_WALK_Y;
 519       }
 520    }
 521 }
 522
 523 static void
 524 i915_set_draw_region(struct intel_context *intel,
 525                      struct intel_region *color_regions[],
 526                      struct intel_region *depth_region,
 527                      GLuint num_regions)
 528 {
 529    struct i915_context *i915 = i915_context(&intel->ctx);
 530    GLcontext *ctx = &intel->ctx;
 531    struct gl_renderbuffer *rb = ctx->DrawBuffer->_ColorDrawBuffers[0];
 532    struct intel_renderbuffer *irb = intel_renderbuffer(rb);
 533    GLuint value;
 534    struct i915_hw_state *state = &i915->state;
 535    uint32_t draw_x, draw_y;
 536
 537    if (state->draw_region != color_regions[0]) {
 538       intel_region_release(&state->draw_region);
 539       intel_region_reference(&state->draw_region, color_regions[0]);
 540    }
 541    if (state->depth_region != depth_region) {
 542       intel_region_release(&state->depth_region);
 543       intel_region_reference(&state->depth_region, depth_region);
 544    }
 545
 546    /*
 547     * Set stride/cpp values
 548     */
 549    i915_set_buf_info_for_region(&state->Buffer[I915_DESTREG_CBUFADDR0],
 550                                 color_regions[0], BUF_3D_ID_COLOR_BACK);
 551
 552    i915_set_buf_info_for_region(&state->Buffer[I915_DESTREG_DBUFADDR0],
 553                                 depth_region, BUF_3D_ID_DEPTH);
 554
 555    /*
 556     * Compute/set I915_DESTREG_DV1 value
 557     */
 558    value = (DSTORG_HORT_BIAS(0x8) |     /* .5 */
 559             DSTORG_VERT_BIAS(0x8) |     /* .5 */
 560             LOD_PRECLAMP_OGL | TEX_DEFAULT_COLOR_OGL);
 561    if (irb != NULL) {
 562       switch (irb->Base.Format) {
 563       case MESA_FORMAT_ARGB8888:
 564       case MESA_FORMAT_XRGB8888:
 565          value |= DV_PF_8888;
 566          break;
 567       case MESA_FORMAT_RGB565:
 568          value |= DV_PF_565 | DITHER_FULL_ALWAYS;
 569          break;
 570       case MESA_FORMAT_ARGB1555:
 571          value |= DV_PF_1555 | DITHER_FULL_ALWAYS;
 572          break;
 573       case MESA_FORMAT_ARGB4444:
 574          value |= DV_PF_4444 | DITHER_FULL_ALWAYS;
 575          break;
 576       default:
 577          _mesa_problem(ctx, "Bad renderbuffer format: %d\n",
 578                        irb->Base.Format);
 579       }
 580    }
 581
 582    /* This isn't quite safe, thus being hidden behind an option.  When changing
 583     * the value of this bit, the pipeline needs to be MI_FLUSHed.  And it
 584     * can only be set when a depth buffer is already defined.
 585     */
 586    if (intel->is_945 && intel->use_early_z &&
 587        depth_region->tiling != I915_TILING_NONE)
 588       value |= CLASSIC_EARLY_DEPTH;
 589
 590    if (depth_region && depth_region->cpp == 4) {
 591       value |= DEPTH_FRMT_24_FIXED_8_OTHER;
 592    }
 593    else {
 594       value |= DEPTH_FRMT_16_FIXED;
 595    }
 596    state->Buffer[I915_DESTREG_DV1] = value;
 597
 598    /* We set up the drawing rectangle to be offset into the color
 599     * region's location in the miptree.  If it doesn't match with
 600     * depth's offsets, we can't render to it.
 601     *
 602     * (Well, not actually true -- the hw grew a bit to let depth's
 603     * offset get forced to 0,0.  We may want to use that if people are
 604     * hitting that case.  Also, some configurations may be supportable
 605     * by tweaking the start offset of the buffers around, which we
 606     * can't do in general due to tiling)
 607     */
 608    FALLBACK(intel, I915_FALLBACK_DRAW_OFFSET,
 609             (depth_region && color_regions[0]) &&
 610             (depth_region->draw_x != color_regions[0]->draw_x ||
 611              depth_region->draw_y != color_regions[0]->draw_y));
 612
 613    if (color_regions[0]) {
 614       draw_x = color_regions[0]->draw_x;
 615       draw_y = color_regions[0]->draw_y;
 616    } else if (depth_region) {
 617       draw_x = depth_region->draw_x;
 618       draw_y = depth_region->draw_y;
 619    } else {
 620       draw_x = 0;
 621       draw_y = 0;
 622    }
 623
 624    /* When changing drawing rectangle offset, an MI_FLUSH is first required. */
 625    state->Buffer[I915_DESTREG_DRAWRECT0] = MI_FLUSH;
 626    state->Buffer[I915_DESTREG_DRAWRECT1] = _3DSTATE_DRAWRECT_INFO;
 627    state->Buffer[I915_DESTREG_DRAWRECT2] = 0;
 628    state->Buffer[I915_DESTREG_DRAWRECT3] = (draw_y << 16) | draw_x;
 629    state->Buffer[I915_DESTREG_DRAWRECT4] =
 630       ((ctx->DrawBuffer->Width + draw_x) & 0xffff) |
 631       ((ctx->DrawBuffer->Height + draw_y) << 16);
 632    state->Buffer[I915_DESTREG_DRAWRECT5] = (draw_y << 16) | draw_x;
 633
 634    I915_STATECHANGE(i915, I915_UPLOAD_BUFFERS);
 635 }
 636
 637
 638
 639 static void
 640 i915_new_batch(struct intel_context *intel)
 641 {
 642    struct i915_context *i915 = i915_context(&intel->ctx);
 643
 644    /* Mark all state as needing to be emitted when starting a new batchbuffer.
 645     * Using hardware contexts would be an alternative, but they have some
 646     * difficulties associated with them (physical address requirements).
 647     */
 648    i915->state.emitted = 0;
 649 }
 650
 651 static void
 652 i915_assert_not_dirty( struct intel_context *intel )
 653 {
 654    struct i915_context *i915 = i915_context(&intel->ctx);
 655    GLuint dirty = get_dirty(&i915->state);
 656    assert(!dirty);
 657 }
 658
 659 void
 660 i915InitVtbl(struct i915_context *i915)
 661 {
 662    i915->intel.vtbl.check_vertex_size = i915_check_vertex_size;
 663    i915->intel.vtbl.destroy = i915_destroy_context;
 664    i915->intel.vtbl.emit_state = i915_emit_state;
 665    i915->intel.vtbl.new_batch = i915_new_batch;
 666    i915->intel.vtbl.reduced_primitive_state = i915_reduced_primitive_state;
 667    i915->intel.vtbl.render_start = i915_render_start;
 668    i915->intel.vtbl.render_prevalidate = i915_render_prevalidate;
 669    i915->intel.vtbl.set_draw_region = i915_set_draw_region;
 670    i915->intel.vtbl.update_texture_state = i915UpdateTextureState;
 671    i915->intel.vtbl.assert_not_dirty = i915_assert_not_dirty;
 672    i915->intel.vtbl.finish_batch = intel_finish_vb;
 673 }