src/mesa/drivers/dri/i965/intel_context.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 #include "main/glheader.h"
  30 #include "main/context.h"
  31 #include "main/extensions.h"
  32 #include "main/fbobject.h"
  33 #include "main/framebuffer.h"
  34 #include "main/imports.h"
  35 #include "main/points.h"
  36 #include "main/renderbuffer.h"
  37
  38 #include "swrast/swrast.h"
  39 #include "swrast_setup/swrast_setup.h"
  40 #include "tnl/tnl.h"
  41 #include "drivers/common/driverfuncs.h"
  42 #include "drivers/common/meta.h"
  43
  44 #include "intel_chipset.h"
  45 #include "intel_buffers.h"
  46 #include "intel_tex.h"
  47 #include "intel_batchbuffer.h"
  48 #include "intel_clear.h"
  49 #include "intel_extensions.h"
  50 #include "intel_pixel.h"
  51 #include "intel_regions.h"
  52 #include "intel_buffer_objects.h"
  53 #include "intel_fbo.h"
  54 #include "intel_bufmgr.h"
  55 #include "intel_screen.h"
  56 #include "intel_mipmap_tree.h"
  57
  58 #include "utils.h"
  59 #include "../glsl/ralloc.h"
  60
  61 #ifndef INTEL_DEBUG
  62 int INTEL_DEBUG = (0);
  63 #endif
  64
  65
  66 static const GLubyte *
  67 intelGetString(struct gl_context * ctx, GLenum name)
  68 {
  69    const struct intel_context *const intel = intel_context(ctx);
  70    const char *chipset;
  71    static char buffer[128];
  72
  73    switch (name) {
  74    case GL_VENDOR:
  75       return (GLubyte *) "Intel Open Source Technology Center";
  76       break;
  77
  78    case GL_RENDERER:
  79       switch (intel->intelScreen->deviceID) {
  80 #undef CHIPSET
  81 #define CHIPSET(id, symbol, str) case id: chipset = str; break;
  82 #include "pci_ids/i915_pci_ids.h"
  83 #include "pci_ids/i965_pci_ids.h"
  84       default:
  85          chipset = "Unknown Intel Chipset";
  86          break;
  87       }
  88
  89       (void) driGetRendererString(buffer, chipset, 0);
  90       return (GLubyte *) buffer;
  91
  92    default:
  93       return NULL;
  94    }
  95 }
  96
  97 void
  98 intel_resolve_for_dri2_flush(struct intel_context *intel,
  99                              __DRIdrawable *drawable)
 100 {
 101    if (intel->gen < 6) {
 102       /* MSAA and fast color clear are not supported, so don't waste time
 103        * checking whether a resolve is needed.
 104        */
 105       return;
 106    }
 107
 108    struct gl_framebuffer *fb = drawable->driverPrivate;
 109    struct intel_renderbuffer *rb;
 110
 111    /* Usually, only the back buffer will need to be downsampled. However,
 112     * the front buffer will also need it if the user has rendered into it.
 113     */
 114    static const gl_buffer_index buffers[2] = {
 115          BUFFER_BACK_LEFT,
 116          BUFFER_FRONT_LEFT,
 117    };
 118
 119    for (int i = 0; i < 2; ++i) {
 120       rb = intel_get_renderbuffer(fb, buffers[i]);
 121       if (rb == NULL || rb->mt == NULL)
 122          continue;
 123       if (rb->mt->num_samples <= 1)
 124          intel_miptree_resolve_color(intel, rb->mt);
 125       else
 126          intel_miptree_downsample(intel, rb->mt);
 127    }
 128 }
 129
 130 static void
 131 intel_flush_front(struct gl_context *ctx)
 132 {
 133    struct intel_context *intel = intel_context(ctx);
 134     __DRIcontext *driContext = intel->driContext;
 135     __DRIdrawable *driDrawable = driContext->driDrawablePriv;
 136     __DRIscreen *const screen = intel->intelScreen->driScrnPriv;
 137
 138     if (intel->front_buffer_dirty && _mesa_is_winsys_fbo(ctx->DrawBuffer)) {
 139       if (screen->dri2.loader->flushFrontBuffer != NULL &&
 140           driDrawable &&
 141           driDrawable->loaderPrivate) {
 142
 143          /* Resolve before flushing FAKE_FRONT_LEFT to FRONT_LEFT.
 144           *
 145           * This potentially resolves both front and back buffer. It
 146           * is unnecessary to resolve the back, but harms nothing except
 147           * performance. And no one cares about front-buffer render
 148           * performance.
 149           */
 150          intel_resolve_for_dri2_flush(intel, driDrawable);
 151
 152          screen->dri2.loader->flushFrontBuffer(driDrawable,
 153                                                driDrawable->loaderPrivate);
 154
 155          /* We set the dirty bit in intel_prepare_render() if we're
 156           * front buffer rendering once we get there.
 157           */
 158          intel->front_buffer_dirty = false;
 159       }
 160    }
 161 }
 162
 163 static unsigned
 164 intel_bits_per_pixel(const struct intel_renderbuffer *rb)
 165 {
 166    return _mesa_get_format_bytes(intel_rb_format(rb)) * 8;
 167 }
 168
 169 static void
 170 intel_query_dri2_buffers(struct intel_context *intel,
 171                          __DRIdrawable *drawable,
 172                          __DRIbuffer **buffers,
 173                          int *count);
 174
 175 static void
 176 intel_process_dri2_buffer(struct intel_context *intel,
 177                           __DRIdrawable *drawable,
 178                           __DRIbuffer *buffer,
 179                           struct intel_renderbuffer *rb,
 180                           const char *buffer_name);
 181
 182 void
 183 intel_update_renderbuffers(__DRIcontext *context, __DRIdrawable *drawable)
 184 {
 185    struct gl_framebuffer *fb = drawable->driverPrivate;
 186    struct intel_renderbuffer *rb;
 187    struct intel_context *intel = context->driverPrivate;
 188    __DRIbuffer *buffers = NULL;
 189    int i, count;
 190    const char *region_name;
 191
 192    /* Set this up front, so that in case our buffers get invalidated
 193     * while we're getting new buffers, we don't clobber the stamp and
 194     * thus ignore the invalidate. */
 195    drawable->lastStamp = drawable->dri2.stamp;
 196
 197    if (unlikely(INTEL_DEBUG & DEBUG_DRI))
 198       fprintf(stderr, "enter %s, drawable %p\n", __func__, drawable);
 199
 200    intel_query_dri2_buffers(intel, drawable, &buffers, &count);
 201
 202    if (buffers == NULL)
 203       return;
 204
 205    for (i = 0; i < count; i++) {
 206        switch (buffers[i].attachment) {
 207        case __DRI_BUFFER_FRONT_LEFT:
 208            rb = intel_get_renderbuffer(fb, BUFFER_FRONT_LEFT);
 209            region_name = "dri2 front buffer";
 210            break;
 211
 212        case __DRI_BUFFER_FAKE_FRONT_LEFT:
 213            rb = intel_get_renderbuffer(fb, BUFFER_FRONT_LEFT);
 214            region_name = "dri2 fake front buffer";
 215            break;
 216
 217        case __DRI_BUFFER_BACK_LEFT:
 218            rb = intel_get_renderbuffer(fb, BUFFER_BACK_LEFT);
 219            region_name = "dri2 back buffer";
 220            break;
 221
 222        case __DRI_BUFFER_DEPTH:
 223        case __DRI_BUFFER_HIZ:
 224        case __DRI_BUFFER_DEPTH_STENCIL:
 225        case __DRI_BUFFER_STENCIL:
 226        case __DRI_BUFFER_ACCUM:
 227        default:
 228            fprintf(stderr,
 229                    "unhandled buffer attach event, attachment type %d\n",
 230                    buffers[i].attachment);
 231            return;
 232        }
 233
 234        intel_process_dri2_buffer(intel, drawable, &buffers[i], rb, region_name);
 235    }
 236
 237    driUpdateFramebufferSize(&intel->ctx, drawable);
 238 }
 239
 240 /**
 241  * intel_prepare_render should be called anywhere that curent read/drawbuffer
 242  * state is required.
 243  */
 244 void
 245 intel_prepare_render(struct intel_context *intel)
 246 {
 247    __DRIcontext *driContext = intel->driContext;
 248    __DRIdrawable *drawable;
 249
 250    drawable = driContext->driDrawablePriv;
 251    if (drawable && drawable->dri2.stamp != driContext->dri2.draw_stamp) {
 252       if (drawable->lastStamp != drawable->dri2.stamp)
 253          intel_update_renderbuffers(driContext, drawable);
 254       intel_draw_buffer(&intel->ctx);
 255       driContext->dri2.draw_stamp = drawable->dri2.stamp;
 256    }
 257
 258    drawable = driContext->driReadablePriv;
 259    if (drawable && drawable->dri2.stamp != driContext->dri2.read_stamp) {
 260       if (drawable->lastStamp != drawable->dri2.stamp)
 261          intel_update_renderbuffers(driContext, drawable);
 262       driContext->dri2.read_stamp = drawable->dri2.stamp;
 263    }
 264
 265    /* If we're currently rendering to the front buffer, the rendering
 266     * that will happen next will probably dirty the front buffer.  So
 267     * mark it as dirty here.
 268     */
 269    if (intel->is_front_buffer_rendering)
 270       intel->front_buffer_dirty = true;
 271
 272    /* Wait for the swapbuffers before the one we just emitted, so we
 273     * don't get too many swaps outstanding for apps that are GPU-heavy
 274     * but not CPU-heavy.
 275     *
 276     * We're using intelDRI2Flush (called from the loader before
 277     * swapbuffer) and glFlush (for front buffer rendering) as the
 278     * indicator that a frame is done and then throttle when we get
 279     * here as we prepare to render the next frame.  At this point for
 280     * round trips for swap/copy and getting new buffers are done and
 281     * we'll spend less time waiting on the GPU.
 282     *
 283     * Unfortunately, we don't have a handle to the batch containing
 284     * the swap, and getting our hands on that doesn't seem worth it,
 285     * so we just us the first batch we emitted after the last swap.
 286     */
 287    if (intel->need_throttle && intel->first_post_swapbuffers_batch) {
 288       if (!intel->disable_throttling)
 289          drm_intel_bo_wait_rendering(intel->first_post_swapbuffers_batch);
 290       drm_intel_bo_unreference(intel->first_post_swapbuffers_batch);
 291       intel->first_post_swapbuffers_batch = NULL;
 292       intel->need_throttle = false;
 293    }
 294 }
 295
 296 static void
 297 intel_viewport(struct gl_context *ctx, GLint x, GLint y, GLsizei w, GLsizei h)
 298 {
 299     struct intel_context *intel = intel_context(ctx);
 300     __DRIcontext *driContext = intel->driContext;
 301
 302     if (intel->saved_viewport)
 303         intel->saved_viewport(ctx, x, y, w, h);
 304
 305     if (_mesa_is_winsys_fbo(ctx->DrawBuffer)) {
 306        dri2InvalidateDrawable(driContext->driDrawablePriv);
 307        dri2InvalidateDrawable(driContext->driReadablePriv);
 308     }
 309 }
 310
 311 static const struct dri_debug_control debug_control[] = {
 312    { "tex",   DEBUG_TEXTURE},
 313    { "state", DEBUG_STATE},
 314    { "ioctl", DEBUG_IOCTL},
 315    { "blit",  DEBUG_BLIT},
 316    { "mip",   DEBUG_MIPTREE},
 317    { "fall",  DEBUG_PERF},
 318    { "perf",  DEBUG_PERF},
 319    { "bat",   DEBUG_BATCH},
 320    { "pix",   DEBUG_PIXEL},
 321    { "buf",   DEBUG_BUFMGR},
 322    { "reg",   DEBUG_REGION},
 323    { "fbo",   DEBUG_FBO},
 324    { "fs",    DEBUG_WM },
 325    { "gs",    DEBUG_GS},
 326    { "sync",  DEBUG_SYNC},
 327    { "prim",  DEBUG_PRIMS },
 328    { "vert",  DEBUG_VERTS },
 329    { "dri",   DEBUG_DRI },
 330    { "sf",    DEBUG_SF },
 331    { "stats", DEBUG_STATS },
 332    { "wm",    DEBUG_WM },
 333    { "urb",   DEBUG_URB },
 334    { "vs",    DEBUG_VS },
 335    { "clip",  DEBUG_CLIP },
 336    { "aub",   DEBUG_AUB },
 337    { "shader_time", DEBUG_SHADER_TIME },
 338    { "no16",  DEBUG_NO16 },
 339    { "blorp", DEBUG_BLORP },
 340    { NULL,    0 }
 341 };
 342
 343
 344 static void
 345 intelInvalidateState(struct gl_context * ctx, GLuint new_state)
 346 {
 347     struct intel_context *intel = intel_context(ctx);
 348
 349     if (ctx->swrast_context)
 350        _swrast_InvalidateState(ctx, new_state);
 351    _vbo_InvalidateState(ctx, new_state);
 352
 353    intel->NewGLState |= new_state;
 354
 355    if (intel->vtbl.invalidate_state)
 356       intel->vtbl.invalidate_state( intel, new_state );
 357 }
 358
 359 void
 360 intel_flush_rendering_to_batch(struct gl_context *ctx)
 361 {
 362    struct intel_context *intel = intel_context(ctx);
 363
 364    if (intel->Fallback)
 365       _swrast_flush(ctx);
 366 }
 367
 368 void
 369 _intel_flush(struct gl_context *ctx, const char *file, int line)
 370 {
 371    struct intel_context *intel = intel_context(ctx);
 372
 373    intel_flush_rendering_to_batch(ctx);
 374
 375    if (intel->batch.used)
 376       _intel_batchbuffer_flush(intel, file, line);
 377 }
 378
 379 static void
 380 intel_glFlush(struct gl_context *ctx)
 381 {
 382    struct intel_context *intel = intel_context(ctx);
 383
 384    intel_flush(ctx);
 385    intel_flush_front(ctx);
 386    if (intel->is_front_buffer_rendering)
 387       intel->need_throttle = true;
 388 }
 389
 390 void
 391 intelFinish(struct gl_context * ctx)
 392 {
 393    struct intel_context *intel = intel_context(ctx);
 394
 395    intel_flush(ctx);
 396    intel_flush_front(ctx);
 397
 398    if (intel->batch.last_bo)
 399       drm_intel_bo_wait_rendering(intel->batch.last_bo);
 400 }
 401
 402 void
 403 intelInitDriverFunctions(struct dd_function_table *functions)
 404 {
 405    _mesa_init_driver_functions(functions);
 406
 407    functions->Flush = intel_glFlush;
 408    functions->Finish = intelFinish;
 409    functions->GetString = intelGetString;
 410    functions->UpdateState = intelInvalidateState;
 411
 412    intelInitTextureFuncs(functions);
 413    intelInitTextureImageFuncs(functions);
 414    intelInitTextureSubImageFuncs(functions);
 415    intelInitTextureCopyImageFuncs(functions);
 416    intelInitClearFuncs(functions);
 417    intelInitBufferFuncs(functions);
 418    intelInitPixelFuncs(functions);
 419    intelInitBufferObjectFuncs(functions);
 420    intel_init_syncobj_functions(functions);
 421 }
 422
 423 static bool
 424 validate_context_version(struct intel_screen *screen,
 425                          int mesa_api,
 426                          unsigned major_version,
 427                          unsigned minor_version,
 428                          unsigned *dri_ctx_error)
 429 {
 430    unsigned req_version = 10 * major_version + minor_version;
 431    unsigned max_version = 0;
 432
 433    switch (mesa_api) {
 434    case API_OPENGL_COMPAT:
 435       max_version = screen->max_gl_compat_version;
 436       break;
 437    case API_OPENGL_CORE:
 438       max_version = screen->max_gl_core_version;
 439       break;
 440    case API_OPENGLES:
 441       max_version = screen->max_gl_es1_version;
 442       break;
 443    case API_OPENGLES2:
 444       max_version = screen->max_gl_es2_version;
 445       break;
 446    default:
 447       max_version = 0;
 448       break;
 449    }
 450
 451    if (max_version == 0) {
 452       *dri_ctx_error = __DRI_CTX_ERROR_BAD_API;
 453       return false;
 454    } else if (req_version > max_version) {
 455       *dri_ctx_error = __DRI_CTX_ERROR_BAD_VERSION;
 456       return false;
 457    }
 458
 459    return true;
 460 }
 461
 462 bool
 463 intelInitContext(struct intel_context *intel,
 464                  int api,
 465                  unsigned major_version,
 466                  unsigned minor_version,
 467                  const struct gl_config * mesaVis,
 468                  __DRIcontext * driContextPriv,
 469                  void *sharedContextPrivate,
 470                  struct dd_function_table *functions,
 471                  unsigned *dri_ctx_error)
 472 {
 473    struct gl_context *ctx = &intel->ctx;
 474    struct gl_context *shareCtx = (struct gl_context *) sharedContextPrivate;
 475    __DRIscreen *sPriv = driContextPriv->driScreenPriv;
 476    struct intel_screen *intelScreen = sPriv->driverPrivate;
 477    int bo_reuse_mode;
 478    struct gl_config visual;
 479
 480    /* we can't do anything without a connection to the device */
 481    if (intelScreen->bufmgr == NULL) {
 482       *dri_ctx_error = __DRI_CTX_ERROR_NO_MEMORY;
 483       return false;
 484    }
 485
 486    if (!validate_context_version(intelScreen,
 487                                  api, major_version, minor_version,
 488                                  dri_ctx_error))
 489       return false;
 490
 491    /* Can't rely on invalidate events, fall back to glViewport hack */
 492    if (!driContextPriv->driScreenPriv->dri2.useInvalidate) {
 493       intel->saved_viewport = functions->Viewport;
 494       functions->Viewport = intel_viewport;
 495    }
 496
 497    if (mesaVis == NULL) {
 498       memset(&visual, 0, sizeof visual);
 499       mesaVis = &visual;
 500    }
 501
 502    intel->intelScreen = intelScreen;
 503
 504    if (!_mesa_initialize_context(&intel->ctx, api, mesaVis, shareCtx,
 505                                  functions)) {
 506       *dri_ctx_error = __DRI_CTX_ERROR_NO_MEMORY;
 507       printf("%s: failed to init mesa context\n", __FUNCTION__);
 508       return false;
 509    }
 510
 511    driContextPriv->driverPrivate = intel;
 512    intel->driContext = driContextPriv;
 513    intel->driFd = sPriv->fd;
 514
 515    intel->gen = intelScreen->gen;
 516
 517    const int devID = intelScreen->deviceID;
 518    if (IS_SNB_GT1(devID) || IS_IVB_GT1(devID) || IS_HSW_GT1(devID))
 519       intel->gt = 1;
 520    else if (IS_SNB_GT2(devID) || IS_IVB_GT2(devID) || IS_HSW_GT2(devID))
 521       intel->gt = 2;
 522    else if (IS_HSW_GT3(devID))
 523       intel->gt = 3;
 524    else
 525       intel->gt = 0;
 526
 527    if (IS_HASWELL(devID)) {
 528       intel->is_haswell = true;
 529    } else if (IS_BAYTRAIL(devID)) {
 530       intel->is_baytrail = true;
 531       intel->gt = 1;
 532    } else if (IS_G4X(devID)) {
 533       intel->is_g4x = true;
 534    } else if (IS_945(devID)) {
 535       intel->is_945 = true;
 536    }
 537
 538    if (intel->gen >= 5) {
 539       intel->needs_ff_sync = true;
 540    }
 541
 542    intel->has_separate_stencil = intel->intelScreen->hw_has_separate_stencil;
 543    intel->must_use_separate_stencil = intel->intelScreen->hw_must_use_separate_stencil;
 544    intel->has_hiz = intel->gen >= 6;
 545    intel->has_llc = intel->intelScreen->hw_has_llc;
 546    intel->has_swizzling = intel->intelScreen->hw_has_swizzling;
 547
 548    memset(&ctx->TextureFormatSupported,
 549           0, sizeof(ctx->TextureFormatSupported));
 550
 551    driParseConfigFiles(&intel->optionCache, &intelScreen->optionCache,
 552                        sPriv->myNum, "i965");
 553    intel->maxBatchSize = BATCH_SZ;
 554
 555    /* Estimate the size of the mappable aperture into the GTT.  There's an
 556     * ioctl to get the whole GTT size, but not one to get the mappable subset.
 557     * It turns out it's basically always 256MB, though some ancient hardware
 558     * was smaller.
 559     */
 560    uint32_t gtt_size = 256 * 1024 * 1024;
 561
 562    /* We don't want to map two objects such that a memcpy between them would
 563     * just fault one mapping in and then the other over and over forever.  So
 564     * we would need to divide the GTT size by 2.  Additionally, some GTT is
 565     * taken up by things like the framebuffer and the ringbuffer and such, so
 566     * be more conservative.
 567     */
 568    intel->max_gtt_map_object_size = gtt_size / 4;
 569
 570    intel->bufmgr = intelScreen->bufmgr;
 571
 572    bo_reuse_mode = driQueryOptioni(&intel->optionCache, "bo_reuse");
 573    switch (bo_reuse_mode) {
 574    case DRI_CONF_BO_REUSE_DISABLED:
 575       break;
 576    case DRI_CONF_BO_REUSE_ALL:
 577       intel_bufmgr_gem_enable_reuse(intel->bufmgr);
 578       break;
 579    }
 580
 581    ctx->Const.MinLineWidth = 1.0;
 582    ctx->Const.MinLineWidthAA = 1.0;
 583    ctx->Const.MaxLineWidth = 5.0;
 584    ctx->Const.MaxLineWidthAA = 5.0;
 585    ctx->Const.LineWidthGranularity = 0.5;
 586
 587    ctx->Const.MinPointSize = 1.0;
 588    ctx->Const.MinPointSizeAA = 1.0;
 589    ctx->Const.MaxPointSize = 255.0;
 590    ctx->Const.MaxPointSizeAA = 3.0;
 591    ctx->Const.PointSizeGranularity = 1.0;
 592
 593    if (intel->gen >= 6)
 594       ctx->Const.MaxClipPlanes = 8;
 595
 596    ctx->Const.StripTextureBorder = GL_TRUE;
 597
 598    /* reinitialize the context point state.
 599     * It depend on constants in __struct gl_contextRec::Const
 600     */
 601    _mesa_init_point(ctx);
 602
 603    ctx->Const.MaxRenderbufferSize = 8192;
 604
 605    /* Initialize the software rasterizer and helper modules.
 606     *
 607     * As of GL 3.1 core, the gen4+ driver doesn't need the swrast context for
 608     * software fallbacks (which we have to support on legacy GL to do weird
 609     * glDrawPixels(), glBitmap(), and other functions).
 610     */
 611    if (api != API_OPENGL_CORE) {
 612       _swrast_CreateContext(ctx);
 613    }
 614
 615    _vbo_CreateContext(ctx);
 616    if (ctx->swrast_context) {
 617       _tnl_CreateContext(ctx);
 618       _swsetup_CreateContext(ctx);
 619
 620       /* Configure swrast to match hardware characteristics: */
 621       _swrast_allow_pixel_fog(ctx, false);
 622       _swrast_allow_vertex_fog(ctx, true);
 623    }
 624
 625    _mesa_meta_init(ctx);
 626
 627    intel->hw_stencil = mesaVis->stencilBits && mesaVis->depthBits == 24;
 628    intel->hw_stipple = 1;
 629
 630    intel->RenderIndex = ~0;
 631
 632    intelInitExtensions(ctx);
 633
 634    INTEL_DEBUG = driParseDebugString(getenv("INTEL_DEBUG"), debug_control);
 635    if (INTEL_DEBUG & DEBUG_BUFMGR)
 636       dri_bufmgr_set_debug(intel->bufmgr, true);
 637    if ((INTEL_DEBUG & DEBUG_SHADER_TIME) && intel->gen < 7) {
 638       fprintf(stderr,
 639               "shader_time debugging requires gen7 (Ivybridge) or better.\n");
 640       INTEL_DEBUG &= ~DEBUG_SHADER_TIME;
 641    }
 642    if (INTEL_DEBUG & DEBUG_PERF)
 643       intel->perf_debug = true;
 644
 645    if (INTEL_DEBUG & DEBUG_AUB)
 646       drm_intel_bufmgr_gem_set_aub_dump(intel->bufmgr, true);
 647
 648    intel_batchbuffer_init(intel);
 649
 650    intel_fbo_init(intel);
 651
 652    intel->use_early_z = driQueryOptionb(&intel->optionCache, "early_z");
 653
 654    if (!driQueryOptionb(&intel->optionCache, "hiz")) {
 655        intel->has_hiz = false;
 656        /* On gen6, you can only do separate stencil with HIZ. */
 657        if (intel->gen == 6)
 658           intel->has_separate_stencil = false;
 659    }
 660
 661    intel->prim.primitive = ~0;
 662
 663    /* Force all software fallbacks */
 664 #ifdef I915
 665    if (driQueryOptionb(&intel->optionCache, "no_rast")) {
 666       fprintf(stderr, "disabling 3D rasterization\n");
 667       intel->no_rast = 1;
 668    }
 669 #endif
 670
 671    if (driQueryOptionb(&intel->optionCache, "always_flush_batch")) {
 672       fprintf(stderr, "flushing batchbuffer before/after each draw call\n");
 673       intel->always_flush_batch = 1;
 674    }
 675
 676    if (driQueryOptionb(&intel->optionCache, "always_flush_cache")) {
 677       fprintf(stderr, "flushing GPU caches before/after each draw call\n");
 678       intel->always_flush_cache = 1;
 679    }
 680
 681    if (driQueryOptionb(&intel->optionCache, "disable_throttling")) {
 682       fprintf(stderr, "disabling flush throttling\n");
 683       intel->disable_throttling = 1;
 684    }
 685
 686    return true;
 687 }
 688
 689 void
 690 intelDestroyContext(__DRIcontext * driContextPriv)
 691 {
 692    struct intel_context *intel =
 693       (struct intel_context *) driContextPriv->driverPrivate;
 694    struct gl_context *ctx = &intel->ctx;
 695
 696    assert(intel);               /* should never be null */
 697    if (intel) {
 698       INTEL_FIREVERTICES(intel);
 699
 700       /* Dump a final BMP in case the application doesn't call SwapBuffers */
 701       if (INTEL_DEBUG & DEBUG_AUB) {
 702          intel_batchbuffer_flush(intel);
 703          aub_dump_bmp(&intel->ctx);
 704       }
 705
 706       _mesa_meta_free(&intel->ctx);
 707
 708       intel->vtbl.destroy(intel);
 709
 710       if (ctx->swrast_context) {
 711          _swsetup_DestroyContext(&intel->ctx);
 712          _tnl_DestroyContext(&intel->ctx);
 713       }
 714       _vbo_DestroyContext(&intel->ctx);
 715
 716       if (ctx->swrast_context)
 717          _swrast_DestroyContext(&intel->ctx);
 718       intel->Fallback = 0x0;      /* don't call _swrast_Flush later */
 719
 720       intel_batchbuffer_free(intel);
 721
 722       free(intel->prim.vb);
 723       intel->prim.vb = NULL;
 724       drm_intel_bo_unreference(intel->prim.vb_bo);
 725       intel->prim.vb_bo = NULL;
 726       drm_intel_bo_unreference(intel->first_post_swapbuffers_batch);
 727       intel->first_post_swapbuffers_batch = NULL;
 728
 729       driDestroyOptionCache(&intel->optionCache);
 730
 731       /* free the Mesa context */
 732       _mesa_free_context_data(&intel->ctx);
 733
 734       _math_matrix_dtr(&intel->ViewportMatrix);
 735
 736       ralloc_free(intel);
 737       driContextPriv->driverPrivate = NULL;
 738    }
 739 }
 740
 741 GLboolean
 742 intelUnbindContext(__DRIcontext * driContextPriv)
 743 {
 744    /* Unset current context and dispath table */
 745    _mesa_make_current(NULL, NULL, NULL);
 746
 747    return true;
 748 }
 749
 750 /**
 751  * Fixes up the context for GLES23 with our default-to-sRGB-capable behavior
 752  * on window system framebuffers.
 753  *
 754  * Desktop GL is fairly reasonable in its handling of sRGB: You can ask if
 755  * your renderbuffer can do sRGB encode, and you can flip a switch that does
 756  * sRGB encode if the renderbuffer can handle it.  You can ask specifically
 757  * for a visual where you're guaranteed to be capable, but it turns out that
 758  * everyone just makes all their ARGB8888 visuals capable and doesn't offer
 759  * incapable ones, becuase there's no difference between the two in resources
 760  * used.  Applications thus get built that accidentally rely on the default
 761  * visual choice being sRGB, so we make ours sRGB capable.  Everything sounds
 762  * great...
 763  *
 764  * But for GLES2/3, they decided that it was silly to not turn on sRGB encode
 765  * for sRGB renderbuffers you made with the GL_EXT_texture_sRGB equivalent.
 766  * So they removed the enable knob and made it "if the renderbuffer is sRGB
 767  * capable, do sRGB encode".  Then, for your window system renderbuffers, you
 768  * can ask for sRGB visuals and get sRGB encode, or not ask for sRGB visuals
 769  * and get no sRGB encode (assuming that both kinds of visual are available).
 770  * Thus our choice to support sRGB by default on our visuals for desktop would
 771  * result in broken rendering of GLES apps that aren't expecting sRGB encode.
 772  *
 773  * Unfortunately, renderbuffer setup happens before a context is created.  So
 774  * in intel_screen.c we always set up sRGB, and here, if you're a GLES2/3
 775  * context (without an sRGB visual, though we don't have sRGB visuals exposed
 776  * yet), we go turn that back off before anyone finds out.
 777  */
 778 static void
 779 intel_gles3_srgb_workaround(struct intel_context *intel,
 780                             struct gl_framebuffer *fb)
 781 {
 782    struct gl_context *ctx = &intel->ctx;
 783
 784    if (_mesa_is_desktop_gl(ctx) || !fb->Visual.sRGBCapable)
 785       return;
 786
 787    /* Some day when we support the sRGB capable bit on visuals available for
 788     * GLES, we'll need to respect that and not disable things here.
 789     */
 790    fb->Visual.sRGBCapable = false;
 791    for (int i = 0; i < BUFFER_COUNT; i++) {
 792       if (fb->Attachment[i].Renderbuffer &&
 793           fb->Attachment[i].Renderbuffer->Format == MESA_FORMAT_SARGB8) {
 794          fb->Attachment[i].Renderbuffer->Format = MESA_FORMAT_ARGB8888;
 795       }
 796    }
 797 }
 798
 799 GLboolean
 800 intelMakeCurrent(__DRIcontext * driContextPriv,
 801                  __DRIdrawable * driDrawPriv,
 802                  __DRIdrawable * driReadPriv)
 803 {
 804    struct intel_context *intel;
 805    GET_CURRENT_CONTEXT(curCtx);
 806
 807    if (driContextPriv)
 808       intel = (struct intel_context *) driContextPriv->driverPrivate;
 809    else
 810       intel = NULL;
 811
 812    /* According to the glXMakeCurrent() man page: "Pending commands to
 813     * the previous context, if any, are flushed before it is released."
 814     * But only flush if we're actually changing contexts.
 815     */
 816    if (intel_context(curCtx) && intel_context(curCtx) != intel) {
 817       _mesa_flush(curCtx);
 818    }
 819
 820    if (driContextPriv) {
 821       struct gl_context *ctx = &intel->ctx;
 822       struct gl_framebuffer *fb, *readFb;
 823
 824       if (driDrawPriv == NULL && driReadPriv == NULL) {
 825          fb = _mesa_get_incomplete_framebuffer();
 826          readFb = _mesa_get_incomplete_framebuffer();
 827       } else {
 828          fb = driDrawPriv->driverPrivate;
 829          readFb = driReadPriv->driverPrivate;
 830          driContextPriv->dri2.draw_stamp = driDrawPriv->dri2.stamp - 1;
 831          driContextPriv->dri2.read_stamp = driReadPriv->dri2.stamp - 1;
 832       }
 833
 834       intel_prepare_render(intel);
 835       _mesa_make_current(ctx, fb, readFb);
 836
 837       intel_gles3_srgb_workaround(intel, ctx->WinSysDrawBuffer);
 838       intel_gles3_srgb_workaround(intel, ctx->WinSysReadBuffer);
 839
 840       /* We do this in intel_prepare_render() too, but intel->ctx.DrawBuffer
 841        * is NULL at that point.  We can't call _mesa_makecurrent()
 842        * first, since we need the buffer size for the initial
 843        * viewport.  So just call intel_draw_buffer() again here. */
 844       intel_draw_buffer(ctx);
 845    }
 846    else {
 847       _mesa_make_current(NULL, NULL, NULL);
 848    }
 849
 850    return true;
 851 }
 852
 853 /**
 854  * \brief Query DRI2 to obtain a DRIdrawable's buffers.
 855  *
 856  * To determine which DRI buffers to request, examine the renderbuffers
 857  * attached to the drawable's framebuffer. Then request the buffers with
 858  * DRI2GetBuffers() or DRI2GetBuffersWithFormat().
 859  *
 860  * This is called from intel_update_renderbuffers().
 861  *
 862  * \param drawable      Drawable whose buffers are queried.
 863  * \param buffers       [out] List of buffers returned by DRI2 query.
 864  * \param buffer_count  [out] Number of buffers returned.
 865  *
 866  * \see intel_update_renderbuffers()
 867  * \see DRI2GetBuffers()
 868  * \see DRI2GetBuffersWithFormat()
 869  */
 870 static void
 871 intel_query_dri2_buffers(struct intel_context *intel,
 872                          __DRIdrawable *drawable,
 873                          __DRIbuffer **buffers,
 874                          int *buffer_count)
 875 {
 876    __DRIscreen *screen = intel->intelScreen->driScrnPriv;
 877    struct gl_framebuffer *fb = drawable->driverPrivate;
 878    int i = 0;
 879    unsigned attachments[8];
 880
 881    struct intel_renderbuffer *front_rb;
 882    struct intel_renderbuffer *back_rb;
 883
 884    front_rb = intel_get_renderbuffer(fb, BUFFER_FRONT_LEFT);
 885    back_rb = intel_get_renderbuffer(fb, BUFFER_BACK_LEFT);
 886
 887    memset(attachments, 0, sizeof(attachments));
 888    if ((intel->is_front_buffer_rendering ||
 889         intel->is_front_buffer_reading ||
 890         !back_rb) && front_rb) {
 891       /* If a fake front buffer is in use, then querying for
 892        * __DRI_BUFFER_FRONT_LEFT will cause the server to copy the image from
 893        * the real front buffer to the fake front buffer.  So before doing the
 894        * query, we need to make sure all the pending drawing has landed in the
 895        * real front buffer.
 896        */
 897       intel_flush(&intel->ctx);
 898       intel_flush_front(&intel->ctx);
 899
 900       attachments[i++] = __DRI_BUFFER_FRONT_LEFT;
 901       attachments[i++] = intel_bits_per_pixel(front_rb);
 902    } else if (front_rb && intel->front_buffer_dirty) {
 903       /* We have pending front buffer rendering, but we aren't querying for a
 904        * front buffer.  If the front buffer we have is a fake front buffer,
 905        * the X server is going to throw it away when it processes the query.
 906        * So before doing the query, make sure all the pending drawing has
 907        * landed in the real front buffer.
 908        */
 909       intel_flush(&intel->ctx);
 910       intel_flush_front(&intel->ctx);
 911    }
 912
 913    if (back_rb) {
 914       attachments[i++] = __DRI_BUFFER_BACK_LEFT;
 915       attachments[i++] = intel_bits_per_pixel(back_rb);
 916    }
 917
 918    assert(i <= ARRAY_SIZE(attachments));
 919
 920    *buffers = screen->dri2.loader->getBuffersWithFormat(drawable,
 921                                                         &drawable->w,
 922                                                         &drawable->h,
 923                                                         attachments, i / 2,
 924                                                         buffer_count,
 925                                                         drawable->loaderPrivate);
 926 }
 927
 928 /**
 929  * \brief Assign a DRI buffer's DRM region to a renderbuffer.
 930  *
 931  * This is called from intel_update_renderbuffers().
 932  *
 933  * \par Note:
 934  *    DRI buffers whose attachment point is DRI2BufferStencil or
 935  *    DRI2BufferDepthStencil are handled as special cases.
 936  *
 937  * \param buffer_name is a human readable name, such as "dri2 front buffer",
 938  *        that is passed to intel_region_alloc_for_handle().
 939  *
 940  * \see intel_update_renderbuffers()
 941  * \see intel_region_alloc_for_handle()
 942  */
 943 static void
 944 intel_process_dri2_buffer(struct intel_context *intel,
 945                           __DRIdrawable *drawable,
 946                           __DRIbuffer *buffer,
 947                           struct intel_renderbuffer *rb,
 948                           const char *buffer_name)
 949 {
 950    struct intel_region *region = NULL;
 951
 952    if (!rb)
 953       return;
 954
 955    unsigned num_samples = rb->Base.Base.NumSamples;
 956
 957    /* We try to avoid closing and reopening the same BO name, because the first
 958     * use of a mapping of the buffer involves a bunch of page faulting which is
 959     * moderately expensive.
 960     */
 961    if (num_samples == 0) {
 962        if (rb->mt &&
 963            rb->mt->region &&
 964            rb->mt->region->name == buffer->name)
 965           return;
 966    } else {
 967        if (rb->mt &&
 968            rb->mt->singlesample_mt &&
 969            rb->mt->singlesample_mt->region &&
 970            rb->mt->singlesample_mt->region->name == buffer->name)
 971           return;
 972    }
 973
 974    if (unlikely(INTEL_DEBUG & DEBUG_DRI)) {
 975       fprintf(stderr,
 976               "attaching buffer %d, at %d, cpp %d, pitch %d\n",
 977               buffer->name, buffer->attachment,
 978               buffer->cpp, buffer->pitch);
 979    }
 980
 981    intel_miptree_release(&rb->mt);
 982    region = intel_region_alloc_for_handle(intel->intelScreen,
 983                                           buffer->cpp,
 984                                           drawable->w,
 985                                           drawable->h,
 986                                           buffer->pitch,
 987                                           buffer->name,
 988                                           buffer_name);
 989    if (!region)
 990       return;
 991
 992    rb->mt = intel_miptree_create_for_dri2_buffer(intel,
 993                                                  buffer->attachment,
 994                                                  intel_rb_format(rb),
 995                                                  num_samples,
 996                                                  region);
 997    intel_region_release(&region);
 998 }