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 #include "main/renderbuffer.h"
  36 #include "main/framebuffer.h"
  37
  38 #include "tnl/tnl.h"
  39 #include "tnl/t_context.h"
  40 #include "tnl/t_vertex.h"
  41 #include "swrast_setup/swrast_setup.h"
  42
  43 #include "intel_batchbuffer.h"
  44 #include "intel_regions.h"
  45 #include "intel_tris.h"
  46 #include "intel_fbo.h"
  47 #include "intel_buffers.h"
  48
  49 #include "i915_reg.h"
  50 #include "i915_context.h"
  51
  52 static void
  53 i915_render_prevalidate(struct intel_context *intel)
  54 {
  55    struct i915_context *i915 = i915_context(&intel->ctx);
  56
  57    i915ValidateFragmentProgram(i915);
  58 }
  59
  60 static void
  61 i915_render_start(struct intel_context *intel)
  62 {
  63    intel_prepare_render(intel);
  64 }
  65
  66
  67 static void
  68 i915_reduced_primitive_state(struct intel_context *intel, GLenum rprim)
  69 {
  70    struct i915_context *i915 = i915_context(&intel->ctx);
  71    GLuint st1 = i915->state.Stipple[I915_STPREG_ST1];
  72
  73    st1 &= ~ST1_ENABLE;
  74
  75    switch (rprim) {
  76    case GL_QUADS: /* from RASTERIZE(GL_QUADS) in t_dd_tritemp.h */
  77    case GL_TRIANGLES:
  78       if (intel->ctx.Polygon.StippleFlag && intel->hw_stipple)
  79          st1 |= ST1_ENABLE;
  80       break;
  81    case GL_LINES:
  82    case GL_POINTS:
  83    default:
  84       break;
  85    }
  86
  87    i915->intel.reduced_primitive = rprim;
  88
  89    if (st1 != i915->state.Stipple[I915_STPREG_ST1]) {
  90       INTEL_FIREVERTICES(intel);
  91
  92       I915_STATECHANGE(i915, I915_UPLOAD_STIPPLE);
  93       i915->state.Stipple[I915_STPREG_ST1] = st1;
  94    }
  95 }
  96
  97
  98 /* Pull apart the vertex format registers and figure out how large a
  99  * vertex is supposed to be.
 100  */
 101 static GLboolean
 102 i915_check_vertex_size(struct intel_context *intel, GLuint expected)
 103 {
 104    struct i915_context *i915 = i915_context(&intel->ctx);
 105    int lis2 = i915->state.Ctx[I915_CTXREG_LIS2];
 106    int lis4 = i915->state.Ctx[I915_CTXREG_LIS4];
 107    int i, sz = 0;
 108
 109    switch (lis4 & S4_VFMT_XYZW_MASK) {
 110    case S4_VFMT_XY:
 111       sz = 2;
 112       break;
 113    case S4_VFMT_XYZ:
 114       sz = 3;
 115       break;
 116    case S4_VFMT_XYW:
 117       sz = 3;
 118       break;
 119    case S4_VFMT_XYZW:
 120       sz = 4;
 121       break;
 122    default:
 123       fprintf(stderr, "no xyzw specified\n");
 124       return 0;
 125    }
 126
 127    if (lis4 & S4_VFMT_SPEC_FOG)
 128       sz++;
 129    if (lis4 & S4_VFMT_COLOR)
 130       sz++;
 131    if (lis4 & S4_VFMT_DEPTH_OFFSET)
 132       sz++;
 133    if (lis4 & S4_VFMT_POINT_WIDTH)
 134       sz++;
 135    if (lis4 & S4_VFMT_FOG_PARAM)
 136       sz++;
 137
 138    for (i = 0; i < 8; i++) {
 139       switch (lis2 & S2_TEXCOORD_FMT0_MASK) {
 140       case TEXCOORDFMT_2D:
 141          sz += 2;
 142          break;
 143       case TEXCOORDFMT_3D:
 144          sz += 3;
 145          break;
 146       case TEXCOORDFMT_4D:
 147          sz += 4;
 148          break;
 149       case TEXCOORDFMT_1D:
 150          sz += 1;
 151          break;
 152       case TEXCOORDFMT_2D_16:
 153          sz += 1;
 154          break;
 155       case TEXCOORDFMT_4D_16:
 156          sz += 2;
 157          break;
 158       case TEXCOORDFMT_NOT_PRESENT:
 159          break;
 160       default:
 161          fprintf(stderr, "bad texcoord fmt %d\n", i);
 162          return GL_FALSE;
 163       }
 164       lis2 >>= S2_TEXCOORD_FMT1_SHIFT;
 165    }
 166
 167    if (sz != expected)
 168       fprintf(stderr, "vertex size mismatch %d/%d\n", sz, expected);
 169
 170    return sz == expected;
 171 }
 172
 173
 174 static void
 175 i915_emit_invarient_state(struct intel_context *intel)
 176 {
 177    BATCH_LOCALS;
 178
 179    BEGIN_BATCH(17);
 180
 181    OUT_BATCH(_3DSTATE_AA_CMD |
 182              AA_LINE_ECAAR_WIDTH_ENABLE |
 183              AA_LINE_ECAAR_WIDTH_1_0 |
 184              AA_LINE_REGION_WIDTH_ENABLE | AA_LINE_REGION_WIDTH_1_0);
 185
 186    OUT_BATCH(_3DSTATE_DFLT_DIFFUSE_CMD);
 187    OUT_BATCH(0);
 188
 189    OUT_BATCH(_3DSTATE_DFLT_SPEC_CMD);
 190    OUT_BATCH(0);
 191
 192    OUT_BATCH(_3DSTATE_DFLT_Z_CMD);
 193    OUT_BATCH(0);
 194
 195    /* Don't support texture crossbar yet */
 196    OUT_BATCH(_3DSTATE_COORD_SET_BINDINGS |
 197              CSB_TCB(0, 0) |
 198              CSB_TCB(1, 1) |
 199              CSB_TCB(2, 2) |
 200              CSB_TCB(3, 3) |
 201              CSB_TCB(4, 4) | CSB_TCB(5, 5) | CSB_TCB(6, 6) | CSB_TCB(7, 7));
 202
 203    /* Need to initialize this to zero.
 204     */
 205    OUT_BATCH(_3DSTATE_LOAD_STATE_IMMEDIATE_1 | I1_LOAD_S(3) | (0));
 206    OUT_BATCH(0);
 207
 208    /* XXX: Use this */
 209    OUT_BATCH(_3DSTATE_SCISSOR_ENABLE_CMD | DISABLE_SCISSOR_RECT);
 210
 211    OUT_BATCH(_3DSTATE_SCISSOR_RECT_0_CMD);
 212    OUT_BATCH(0);
 213    OUT_BATCH(0);
 214
 215    OUT_BATCH(_3DSTATE_DEPTH_SUBRECT_DISABLE);
 216
 217    OUT_BATCH(_3DSTATE_LOAD_INDIRECT | 0);       /* disable indirect state */
 218    OUT_BATCH(0);
 219
 220    ADVANCE_BATCH();
 221 }
 222
 223
 224 #define emit(intel, state, size )                    \
 225    intel_batchbuffer_data(intel, state, size, false)
 226
 227 static GLuint
 228 get_dirty(struct i915_hw_state *state)
 229 {
 230    GLuint dirty;
 231
 232    /* Workaround the multitex hang - if one texture unit state is
 233     * modified, emit all texture units.
 234     */
 235    dirty = state->active & ~state->emitted;
 236    if (dirty & I915_UPLOAD_TEX_ALL)
 237       state->emitted &= ~I915_UPLOAD_TEX_ALL;
 238    dirty = state->active & ~state->emitted;
 239    return dirty;
 240 }
 241
 242
 243 static GLuint
 244 get_state_size(struct i915_hw_state *state)
 245 {
 246    GLuint dirty = get_dirty(state);
 247    GLuint i;
 248    GLuint sz = 0;
 249
 250    if (dirty & I915_UPLOAD_INVARIENT)
 251       sz += 30 * 4;
 252
 253    if (dirty & I915_UPLOAD_RASTER_RULES)
 254       sz += sizeof(state->RasterRules);
 255
 256    if (dirty & I915_UPLOAD_CTX)
 257       sz += sizeof(state->Ctx);
 258
 259    if (dirty & I915_UPLOAD_BLEND)
 260       sz += sizeof(state->Blend);
 261
 262    if (dirty & I915_UPLOAD_BUFFERS)
 263       sz += sizeof(state->Buffer);
 264
 265    if (dirty & I915_UPLOAD_STIPPLE)
 266       sz += sizeof(state->Stipple);
 267
 268    if (dirty & I915_UPLOAD_TEX_ALL) {
 269       int nr = 0;
 270       for (i = 0; i < I915_TEX_UNITS; i++)
 271          if (dirty & I915_UPLOAD_TEX(i))
 272             nr++;
 273
 274       sz += (2 + nr * 3) * sizeof(GLuint) * 2;
 275    }
 276
 277    if (dirty & I915_UPLOAD_CONSTANTS)
 278       sz += state->ConstantSize * sizeof(GLuint);
 279
 280    if (dirty & I915_UPLOAD_PROGRAM)
 281       sz += state->ProgramSize * sizeof(GLuint);
 282
 283    return sz;
 284 }
 285
 286 /* Push the state into the sarea and/or texture memory.
 287  */
 288 static void
 289 i915_emit_state(struct intel_context *intel)
 290 {
 291    struct i915_context *i915 = i915_context(&intel->ctx);
 292    struct i915_hw_state *state = &i915->state;
 293    int i, count, aper_count;
 294    GLuint dirty;
 295    drm_intel_bo *aper_array[3 + I915_TEX_UNITS];
 296    GET_CURRENT_CONTEXT(ctx);
 297    BATCH_LOCALS;
 298
 299    /* We don't hold the lock at this point, so want to make sure that
 300     * there won't be a buffer wrap between the state emits and the primitive
 301     * emit header.
 302     *
 303     * It might be better to talk about explicit places where
 304     * scheduling is allowed, rather than assume that it is whenever a
 305     * batchbuffer fills up.
 306     */
 307    intel_batchbuffer_require_space(intel,
 308                                    get_state_size(state) + INTEL_PRIM_EMIT_SIZE,
 309                                    false);
 310    count = 0;
 311  again:
 312    if (intel->batch.bo == NULL) {
 313       _mesa_error(ctx, GL_OUT_OF_MEMORY, "i915 emit state");
 314       assert(0);
 315    }
 316    aper_count = 0;
 317    dirty = get_dirty(state);
 318
 319    aper_array[aper_count++] = intel->batch.bo;
 320    if (dirty & I915_UPLOAD_BUFFERS) {
 321       aper_array[aper_count++] = state->draw_region->buffer;
 322       if (state->depth_region)
 323          aper_array[aper_count++] = state->depth_region->buffer;
 324    }
 325
 326    if (dirty & I915_UPLOAD_TEX_ALL) {
 327       for (i = 0; i < I915_TEX_UNITS; i++) {
 328          if (dirty & I915_UPLOAD_TEX(i)) {
 329             if (state->tex_buffer[i]) {
 330                aper_array[aper_count++] = state->tex_buffer[i];
 331             }
 332          }
 333       }
 334    }
 335
 336    if (dri_bufmgr_check_aperture_space(aper_array, aper_count)) {
 337        if (count == 0) {
 338            count++;
 339            intel_batchbuffer_flush(intel);
 340            goto again;
 341        } else {
 342            _mesa_error(ctx, GL_OUT_OF_MEMORY, "i915 emit state");
 343            assert(0);
 344        }
 345    }
 346
 347    /* work out list of buffers to emit */
 348
 349    /* Do this here as we may have flushed the batchbuffer above,
 350     * causing more state to be dirty!
 351     */
 352    dirty = get_dirty(state);
 353    state->emitted |= dirty;
 354    assert(get_dirty(state) == 0);
 355
 356    if (INTEL_DEBUG & DEBUG_STATE)
 357       fprintf(stderr, "%s dirty: %x\n", __FUNCTION__, dirty);
 358
 359    if (dirty & I915_UPLOAD_INVARIENT) {
 360       if (INTEL_DEBUG & DEBUG_STATE)
 361          fprintf(stderr, "I915_UPLOAD_INVARIENT:\n");
 362       i915_emit_invarient_state(intel);
 363    }
 364
 365    if (dirty & I915_UPLOAD_RASTER_RULES) {
 366       if (INTEL_DEBUG & DEBUG_STATE)
 367          fprintf(stderr, "I915_UPLOAD_RASTER_RULES:\n");
 368       emit(intel, state->RasterRules, sizeof(state->RasterRules));
 369    }
 370
 371    if (dirty & I915_UPLOAD_CTX) {
 372       if (INTEL_DEBUG & DEBUG_STATE)
 373          fprintf(stderr, "I915_UPLOAD_CTX:\n");
 374
 375       emit(intel, state->Ctx, sizeof(state->Ctx));
 376    }
 377
 378    if (dirty & I915_UPLOAD_BLEND) {
 379       if (INTEL_DEBUG & DEBUG_STATE)
 380          fprintf(stderr, "I915_UPLOAD_BLEND:\n");
 381
 382       emit(intel, state->Blend, sizeof(state->Blend));
 383    }
 384
 385    if (dirty & I915_UPLOAD_BUFFERS) {
 386       GLuint count;
 387
 388       if (INTEL_DEBUG & DEBUG_STATE)
 389          fprintf(stderr, "I915_UPLOAD_BUFFERS:\n");
 390
 391       count = 14;
 392       if (state->Buffer[I915_DESTREG_DRAWRECT0] != MI_NOOP)
 393          count++;
 394       if (state->depth_region)
 395          count += 3;
 396
 397       BEGIN_BATCH(count);
 398       OUT_BATCH(state->Buffer[I915_DESTREG_CBUFADDR0]);
 399       OUT_BATCH(state->Buffer[I915_DESTREG_CBUFADDR1]);
 400       OUT_RELOC(state->draw_region->buffer,
 401                 I915_GEM_DOMAIN_RENDER, I915_GEM_DOMAIN_RENDER, 0);
 402
 403       if (state->depth_region) {
 404          OUT_BATCH(state->Buffer[I915_DESTREG_DBUFADDR0]);
 405          OUT_BATCH(state->Buffer[I915_DESTREG_DBUFADDR1]);
 406          OUT_RELOC(state->depth_region->buffer,
 407                    I915_GEM_DOMAIN_RENDER, I915_GEM_DOMAIN_RENDER, 0);
 408       }
 409
 410       OUT_BATCH(state->Buffer[I915_DESTREG_DV0]);
 411       OUT_BATCH(state->Buffer[I915_DESTREG_DV1]);
 412       OUT_BATCH(state->Buffer[I915_DESTREG_SENABLE]);
 413       OUT_BATCH(state->Buffer[I915_DESTREG_SR0]);
 414       OUT_BATCH(state->Buffer[I915_DESTREG_SR1]);
 415       OUT_BATCH(state->Buffer[I915_DESTREG_SR2]);
 416
 417       if (state->Buffer[I915_DESTREG_DRAWRECT0] != MI_NOOP)
 418          OUT_BATCH(state->Buffer[I915_DESTREG_DRAWRECT0]);
 419       OUT_BATCH(state->Buffer[I915_DESTREG_DRAWRECT1]);
 420       OUT_BATCH(state->Buffer[I915_DESTREG_DRAWRECT2]);
 421       OUT_BATCH(state->Buffer[I915_DESTREG_DRAWRECT3]);
 422       OUT_BATCH(state->Buffer[I915_DESTREG_DRAWRECT4]);
 423       OUT_BATCH(state->Buffer[I915_DESTREG_DRAWRECT5]);
 424
 425       ADVANCE_BATCH();
 426    }
 427
 428    if (dirty & I915_UPLOAD_STIPPLE) {
 429       if (INTEL_DEBUG & DEBUG_STATE)
 430          fprintf(stderr, "I915_UPLOAD_STIPPLE:\n");
 431       emit(intel, state->Stipple, sizeof(state->Stipple));
 432    }
 433
 434    /* Combine all the dirty texture state into a single command to
 435     * avoid lockups on I915 hardware.
 436     */
 437    if (dirty & I915_UPLOAD_TEX_ALL) {
 438       int nr = 0;
 439       GLuint unwind;
 440
 441       for (i = 0; i < I915_TEX_UNITS; i++)
 442          if (dirty & I915_UPLOAD_TEX(i))
 443             nr++;
 444
 445       BEGIN_BATCH(2 + nr * 3);
 446       OUT_BATCH(_3DSTATE_MAP_STATE | (3 * nr));
 447       OUT_BATCH((dirty & I915_UPLOAD_TEX_ALL) >> I915_UPLOAD_TEX_0_SHIFT);
 448       for (i = 0; i < I915_TEX_UNITS; i++)
 449          if (dirty & I915_UPLOAD_TEX(i)) {
 450             OUT_RELOC(state->tex_buffer[i],
 451                       I915_GEM_DOMAIN_SAMPLER, 0,
 452                       state->tex_offset[i]);
 453
 454             OUT_BATCH(state->Tex[i][I915_TEXREG_MS3]);
 455             OUT_BATCH(state->Tex[i][I915_TEXREG_MS4]);
 456          }
 457       ADVANCE_BATCH();
 458
 459       unwind = intel->batch.used;
 460       BEGIN_BATCH(2 + nr * 3);
 461       OUT_BATCH(_3DSTATE_SAMPLER_STATE | (3 * nr));
 462       OUT_BATCH((dirty & I915_UPLOAD_TEX_ALL) >> I915_UPLOAD_TEX_0_SHIFT);
 463       for (i = 0; i < I915_TEX_UNITS; i++)
 464          if (dirty & I915_UPLOAD_TEX(i)) {
 465             OUT_BATCH(state->Tex[i][I915_TEXREG_SS2]);
 466             OUT_BATCH(state->Tex[i][I915_TEXREG_SS3]);
 467             OUT_BATCH(state->Tex[i][I915_TEXREG_SS4]);
 468          }
 469       ADVANCE_BATCH();
 470       if (i915->last_sampler &&
 471           memcmp(intel->batch.map + i915->last_sampler,
 472                  intel->batch.map + unwind,
 473                  (2 + nr*3)*sizeof(int)) == 0)
 474           intel->batch.used = unwind;
 475       else
 476           i915->last_sampler = unwind;
 477    }
 478
 479    if (dirty & I915_UPLOAD_CONSTANTS) {
 480       if (INTEL_DEBUG & DEBUG_STATE)
 481          fprintf(stderr, "I915_UPLOAD_CONSTANTS:\n");
 482       emit(intel, state->Constant, state->ConstantSize * sizeof(GLuint));
 483    }
 484
 485    if (dirty & I915_UPLOAD_PROGRAM) {
 486       if (state->ProgramSize) {
 487          if (INTEL_DEBUG & DEBUG_STATE)
 488             fprintf(stderr, "I915_UPLOAD_PROGRAM:\n");
 489
 490          assert((state->Program[0] & 0x1ff) + 2 == state->ProgramSize);
 491
 492          emit(intel, state->Program, state->ProgramSize * sizeof(GLuint));
 493          if (INTEL_DEBUG & DEBUG_STATE)
 494             i915_disassemble_program(state->Program, state->ProgramSize);
 495       }
 496    }
 497
 498    assert(get_dirty(state) == 0);
 499 }
 500
 501 static void
 502 i915_destroy_context(struct intel_context *intel)
 503 {
 504    GLuint i;
 505    struct i915_context *i915 = i915_context(&intel->ctx);
 506
 507    intel_region_release(&i915->state.draw_region);
 508    intel_region_release(&i915->state.depth_region);
 509
 510    for (i = 0; i < I915_TEX_UNITS; i++) {
 511       if (i915->state.tex_buffer[i] != NULL) {
 512          drm_intel_bo_unreference(i915->state.tex_buffer[i]);
 513          i915->state.tex_buffer[i] = NULL;
 514       }
 515    }
 516
 517    _tnl_free_vertices(&intel->ctx);
 518 }
 519
 520 void
 521 i915_set_buf_info_for_region(uint32_t *state, struct intel_region *region,
 522                              uint32_t buffer_id)
 523 {
 524    state[0] = _3DSTATE_BUF_INFO_CMD;
 525    state[1] = buffer_id;
 526
 527    if (region != NULL) {
 528       state[1] |= BUF_3D_PITCH(region->pitch * region->cpp);
 529
 530       if (region->tiling != I915_TILING_NONE) {
 531          state[1] |= BUF_3D_TILED_SURFACE;
 532          if (region->tiling == I915_TILING_Y)
 533             state[1] |= BUF_3D_TILE_WALK_Y;
 534       }
 535    }
 536 }
 537
 538 static uint32_t i915_render_target_format_for_mesa_format[MESA_FORMAT_COUNT] =
 539 {
 540    [MESA_FORMAT_ARGB8888] = DV_PF_8888,
 541    [MESA_FORMAT_XRGB8888] = DV_PF_8888,
 542    [MESA_FORMAT_RGB565] = DV_PF_565 | DITHER_FULL_ALWAYS,
 543    [MESA_FORMAT_ARGB1555] = DV_PF_1555 | DITHER_FULL_ALWAYS,
 544    [MESA_FORMAT_ARGB4444] = DV_PF_4444 | DITHER_FULL_ALWAYS,
 545 };
 546
 547 static bool
 548 i915_render_target_supported(gl_format format)
 549 {
 550    if (format == MESA_FORMAT_S8_Z24 ||
 551        format == MESA_FORMAT_X8_Z24 ||
 552        format == MESA_FORMAT_Z16) {
 553       return true;
 554    }
 555
 556    return i915_render_target_format_for_mesa_format[format] != 0;
 557 }
 558
 559 static void
 560 i915_set_draw_region(struct intel_context *intel,
 561                      struct intel_region *color_regions[],
 562                      struct intel_region *depth_region,
 563                      GLuint num_regions)
 564 {
 565    struct i915_context *i915 = i915_context(&intel->ctx);
 566    struct gl_context *ctx = &intel->ctx;
 567    struct gl_renderbuffer *rb = ctx->DrawBuffer->_ColorDrawBuffers[0];
 568    struct intel_renderbuffer *irb = intel_renderbuffer(rb);
 569    struct gl_renderbuffer *drb;
 570    struct intel_renderbuffer *idrb = NULL;
 571    GLuint value;
 572    struct i915_hw_state *state = &i915->state;
 573    uint32_t draw_x, draw_y, draw_offset;
 574
 575    if (state->draw_region != color_regions[0]) {
 576       intel_region_reference(&state->draw_region, color_regions[0]);
 577    }
 578    if (state->depth_region != depth_region) {
 579       intel_region_reference(&state->depth_region, depth_region);
 580    }
 581
 582    /*
 583     * Set stride/cpp values
 584     */
 585    i915_set_buf_info_for_region(&state->Buffer[I915_DESTREG_CBUFADDR0],
 586                                 color_regions[0], BUF_3D_ID_COLOR_BACK);
 587
 588    i915_set_buf_info_for_region(&state->Buffer[I915_DESTREG_DBUFADDR0],
 589                                 depth_region, BUF_3D_ID_DEPTH);
 590
 591    /*
 592     * Compute/set I915_DESTREG_DV1 value
 593     */
 594    value = (DSTORG_HORT_BIAS(0x8) |     /* .5 */
 595             DSTORG_VERT_BIAS(0x8) |     /* .5 */
 596             LOD_PRECLAMP_OGL | TEX_DEFAULT_COLOR_OGL);
 597    if (irb != NULL) {
 598       value |= i915_render_target_format_for_mesa_format[irb->Base.Format];
 599    }
 600
 601    /* This isn't quite safe, thus being hidden behind an option.  When changing
 602     * the value of this bit, the pipeline needs to be MI_FLUSHed.  And it
 603     * can only be set when a depth buffer is already defined.
 604     */
 605    if (intel->is_945 && intel->use_early_z &&
 606        depth_region->tiling != I915_TILING_NONE)
 607       value |= CLASSIC_EARLY_DEPTH;
 608
 609    if (depth_region && depth_region->cpp == 4) {
 610       value |= DEPTH_FRMT_24_FIXED_8_OTHER;
 611    }
 612    else {
 613       value |= DEPTH_FRMT_16_FIXED;
 614    }
 615    state->Buffer[I915_DESTREG_DV1] = value;
 616
 617    drb = ctx->DrawBuffer->Attachment[BUFFER_DEPTH].Renderbuffer;
 618    if (!drb)
 619       drb = ctx->DrawBuffer->Attachment[BUFFER_STENCIL].Renderbuffer;
 620
 621    if (drb)
 622       idrb = intel_renderbuffer(drb);
 623
 624    /* We set up the drawing rectangle to be offset into the color
 625     * region's location in the miptree.  If it doesn't match with
 626     * depth's offsets, we can't render to it.
 627     *
 628     * (Well, not actually true -- the hw grew a bit to let depth's
 629     * offset get forced to 0,0.  We may want to use that if people are
 630     * hitting that case.  Also, some configurations may be supportable
 631     * by tweaking the start offset of the buffers around, which we
 632     * can't do in general due to tiling)
 633     */
 634    FALLBACK(intel, I915_FALLBACK_DRAW_OFFSET,
 635             idrb && irb && (idrb->draw_x != irb->draw_x ||
 636                             idrb->draw_y != irb->draw_y));
 637
 638    if (irb) {
 639       draw_x = irb->draw_x;
 640       draw_y = irb->draw_y;
 641    } else if (idrb) {
 642       draw_x = idrb->draw_x;
 643       draw_y = idrb->draw_y;
 644    } else {
 645       draw_x = 0;
 646       draw_y = 0;
 647    }
 648
 649    draw_offset = (draw_y << 16) | draw_x;
 650
 651    /* When changing drawing rectangle offset, an MI_FLUSH is first required. */
 652    if (draw_offset != i915->last_draw_offset) {
 653       FALLBACK(intel, I915_FALLBACK_DRAW_OFFSET,
 654                (ctx->DrawBuffer->Width + draw_x > 2048) ||
 655                (ctx->DrawBuffer->Height + draw_y > 2048));
 656
 657       state->Buffer[I915_DESTREG_DRAWRECT0] = MI_FLUSH | INHIBIT_FLUSH_RENDER_CACHE;
 658       i915->last_draw_offset = draw_offset;
 659    } else
 660       state->Buffer[I915_DESTREG_DRAWRECT0] = MI_NOOP;
 661
 662    state->Buffer[I915_DESTREG_DRAWRECT1] = _3DSTATE_DRAWRECT_INFO;
 663    state->Buffer[I915_DESTREG_DRAWRECT2] = 0;
 664    state->Buffer[I915_DESTREG_DRAWRECT3] = draw_offset;
 665    state->Buffer[I915_DESTREG_DRAWRECT4] =
 666       ((ctx->DrawBuffer->Width + draw_x - 1) & 0xffff) |
 667       ((ctx->DrawBuffer->Height + draw_y - 1) << 16);
 668    state->Buffer[I915_DESTREG_DRAWRECT5] = draw_offset;
 669
 670    I915_STATECHANGE(i915, I915_UPLOAD_BUFFERS);
 671 }
 672
 673 /**
 674  * Update the hardware state for drawing into a window or framebuffer object.
 675  *
 676  * Called by glDrawBuffer, glBindFramebufferEXT, MakeCurrent, and other
 677  * places within the driver.
 678  *
 679  * Basically, this needs to be called any time the current framebuffer
 680  * changes, the renderbuffers change, or we need to draw into different
 681  * color buffers.
 682  */
 683 static void
 684 i915_update_draw_buffer(struct intel_context *intel)
 685 {
 686    struct gl_context *ctx = &intel->ctx;
 687    struct gl_framebuffer *fb = ctx->DrawBuffer;
 688    struct intel_region *colorRegions[MAX_DRAW_BUFFERS], *depthRegion = NULL;
 689    struct intel_renderbuffer *irbDepth = NULL, *irbStencil = NULL;
 690    bool fb_has_hiz = intel_framebuffer_has_hiz(fb);
 691
 692    if (!fb) {
 693       /* this can happen during the initial context initialization */
 694       return;
 695    }
 696
 697    irbDepth = intel_get_renderbuffer(fb, BUFFER_DEPTH);
 698    irbStencil = intel_get_renderbuffer(fb, BUFFER_STENCIL);
 699
 700    /* Do this here, not core Mesa, since this function is called from
 701     * many places within the driver.
 702     */
 703    if (ctx->NewState & _NEW_BUFFERS) {
 704       /* this updates the DrawBuffer->_NumColorDrawBuffers fields, etc */
 705       _mesa_update_framebuffer(ctx);
 706       /* this updates the DrawBuffer's Width/Height if it's a FBO */
 707       _mesa_update_draw_buffer_bounds(ctx);
 708    }
 709
 710    if (fb->_Status != GL_FRAMEBUFFER_COMPLETE_EXT) {
 711       /* this may occur when we're called by glBindFrameBuffer() during
 712        * the process of someone setting up renderbuffers, etc.
 713        */
 714       /*_mesa_debug(ctx, "DrawBuffer: incomplete user FBO\n");*/
 715       return;
 716    }
 717
 718    /* How many color buffers are we drawing into?
 719     *
 720     * If there are zero buffers or the buffer is too big, don't configure any
 721     * regions for hardware drawing.  We'll fallback to software below.  Not
 722     * having regions set makes some of the software fallback paths faster.
 723     */
 724    if ((fb->Width > ctx->Const.MaxRenderbufferSize)
 725        || (fb->Height > ctx->Const.MaxRenderbufferSize)
 726        || (fb->_NumColorDrawBuffers == 0)) {
 727       /* writing to 0  */
 728       colorRegions[0] = NULL;
 729    }
 730    else if (fb->_NumColorDrawBuffers > 1) {
 731        int i;
 732        struct intel_renderbuffer *irb;
 733
 734        for (i = 0; i < fb->_NumColorDrawBuffers; i++) {
 735            irb = intel_renderbuffer(fb->_ColorDrawBuffers[i]);
 736            colorRegions[i] = irb ? irb->region : NULL;
 737        }
 738    }
 739    else {
 740       /* Get the intel_renderbuffer for the single colorbuffer we're drawing
 741        * into.
 742        */
 743       if (fb->Name == 0) {
 744          /* drawing to window system buffer */
 745          if (fb->_ColorDrawBufferIndexes[0] == BUFFER_FRONT_LEFT)
 746             colorRegions[0] = intel_get_rb_region(fb, BUFFER_FRONT_LEFT);
 747          else
 748             colorRegions[0] = intel_get_rb_region(fb, BUFFER_BACK_LEFT);
 749       }
 750       else {
 751          /* drawing to user-created FBO */
 752          struct intel_renderbuffer *irb;
 753          irb = intel_renderbuffer(fb->_ColorDrawBuffers[0]);
 754          colorRegions[0] = (irb && irb->region) ? irb->region : NULL;
 755       }
 756    }
 757
 758    if (!colorRegions[0]) {
 759       FALLBACK(intel, INTEL_FALLBACK_DRAW_BUFFER, GL_TRUE);
 760    }
 761    else {
 762       FALLBACK(intel, INTEL_FALLBACK_DRAW_BUFFER, GL_FALSE);
 763    }
 764
 765    /* Check for depth fallback. */
 766    if (irbDepth && irbDepth->region) {
 767       assert(!fb_has_hiz || irbDepth->Base.Format != MESA_FORMAT_S8_Z24);
 768       FALLBACK(intel, INTEL_FALLBACK_DEPTH_BUFFER, GL_FALSE);
 769       depthRegion = irbDepth->region;
 770    } else if (irbDepth && !irbDepth->region) {
 771       FALLBACK(intel, INTEL_FALLBACK_DEPTH_BUFFER, GL_TRUE);
 772       depthRegion = NULL;
 773    } else { /* !irbDepth */
 774       /* No fallback is needed because there is no depth buffer. */
 775       FALLBACK(intel, INTEL_FALLBACK_DEPTH_BUFFER, GL_FALSE);
 776       depthRegion = NULL;
 777    }
 778
 779    /* Check for stencil fallback. */
 780    if (irbStencil && irbStencil->region) {
 781       assert(irbStencil->Base.Format == MESA_FORMAT_S8_Z24);
 782       FALLBACK(intel, INTEL_FALLBACK_STENCIL_BUFFER, GL_FALSE);
 783    } else if (irbStencil && !irbStencil->region) {
 784       FALLBACK(intel, INTEL_FALLBACK_STENCIL_BUFFER, GL_TRUE);
 785    } else { /* !irbStencil */
 786       /* No fallback is needed because there is no stencil buffer. */
 787       FALLBACK(intel, INTEL_FALLBACK_STENCIL_BUFFER, GL_FALSE);
 788    }
 789
 790    /* If we have a (packed) stencil buffer attached but no depth buffer,
 791     * we still need to set up the shared depth/stencil state so we can use it.
 792     */
 793    if (depthRegion == NULL && irbStencil && irbStencil->region
 794        && irbStencil->Base.Format == MESA_FORMAT_S8_Z24) {
 795       depthRegion = irbStencil->region;
 796    }
 797
 798    /*
 799     * Update depth and stencil test state
 800     */
 801    ctx->Driver.Enable(ctx, GL_DEPTH_TEST,
 802                       (ctx->Depth.Test && fb->Visual.depthBits > 0));
 803    ctx->Driver.Enable(ctx, GL_STENCIL_TEST,
 804                       (ctx->Stencil.Enabled && fb->Visual.stencilBits > 0));
 805
 806    intel->vtbl.set_draw_region(intel, colorRegions, depthRegion,
 807                                fb->_NumColorDrawBuffers);
 808    intel->NewGLState |= _NEW_BUFFERS;
 809
 810    /* update viewport since it depends on window size */
 811    intelCalcViewport(ctx);
 812
 813    /* Set state we know depends on drawable parameters:
 814     */
 815    ctx->Driver.Scissor(ctx, ctx->Scissor.X, ctx->Scissor.Y,
 816                        ctx->Scissor.Width, ctx->Scissor.Height);
 817    ctx->Driver.DepthRange(ctx, ctx->Viewport.Near, ctx->Viewport.Far);
 818
 819    /* Update culling direction which changes depending on the
 820     * orientation of the buffer:
 821     */
 822    ctx->Driver.FrontFace(ctx, ctx->Polygon.FrontFace);
 823 }
 824
 825 static void
 826 i915_new_batch(struct intel_context *intel)
 827 {
 828    struct i915_context *i915 = i915_context(&intel->ctx);
 829
 830    /* Mark all state as needing to be emitted when starting a new batchbuffer.
 831     * Using hardware contexts would be an alternative, but they have some
 832     * difficulties associated with them (physical address requirements).
 833     */
 834    i915->state.emitted = 0;
 835    i915->last_draw_offset = 0;
 836    i915->last_sampler = 0;
 837
 838    i915->current_vb_bo = NULL;
 839    i915->current_vertex_size = 0;
 840 }
 841
 842 static void
 843 i915_assert_not_dirty( struct intel_context *intel )
 844 {
 845    struct i915_context *i915 = i915_context(&intel->ctx);
 846    GLuint dirty = get_dirty(&i915->state);
 847    assert(!dirty);
 848    (void) dirty;
 849 }
 850
 851 /** Return false; i915 does not support HiZ. */
 852 static bool
 853 i915_is_hiz_depth_format(struct intel_context *intel,
 854                          gl_format format)
 855 {
 856    return false;
 857 }
 858
 859 static void
 860 i915_invalidate_state(struct intel_context *intel, GLuint new_state)
 861 {
 862    struct gl_context *ctx = &intel->ctx;
 863
 864    _swsetup_InvalidateState(ctx, new_state);
 865    _tnl_InvalidateState(ctx, new_state);
 866    _tnl_invalidate_vertex_state(ctx, new_state);
 867 }
 868
 869 void
 870 i915InitVtbl(struct i915_context *i915)
 871 {
 872    i915->intel.vtbl.check_vertex_size = i915_check_vertex_size;
 873    i915->intel.vtbl.destroy = i915_destroy_context;
 874    i915->intel.vtbl.emit_state = i915_emit_state;
 875    i915->intel.vtbl.new_batch = i915_new_batch;
 876    i915->intel.vtbl.reduced_primitive_state = i915_reduced_primitive_state;
 877    i915->intel.vtbl.render_start = i915_render_start;
 878    i915->intel.vtbl.render_prevalidate = i915_render_prevalidate;
 879    i915->intel.vtbl.set_draw_region = i915_set_draw_region;
 880    i915->intel.vtbl.update_draw_buffer = i915_update_draw_buffer;
 881    i915->intel.vtbl.update_texture_state = i915UpdateTextureState;
 882    i915->intel.vtbl.assert_not_dirty = i915_assert_not_dirty;
 883    i915->intel.vtbl.finish_batch = intel_finish_vb;
 884    i915->intel.vtbl.invalidate_state = i915_invalidate_state;
 885    i915->intel.vtbl.render_target_supported = i915_render_target_supported;
 886    i915->intel.vtbl.is_hiz_depth_format = i915_is_hiz_depth_format;
 887 }