src/mesa/drivers/dri/i915/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    if (intel->gen < 4)
 368       INTEL_FIREVERTICES(intel);
 369 }
 370
 371 void
 372 _intel_flush(struct gl_context *ctx, const char *file, int line)
 373 {
 374    struct intel_context *intel = intel_context(ctx);
 375
 376    intel_flush_rendering_to_batch(ctx);
 377
 378    if (intel->batch.used)
 379       _intel_batchbuffer_flush(intel, file, line);
 380 }
 381
 382 static void
 383 intel_glFlush(struct gl_context *ctx)
 384 {
 385    struct intel_context *intel = intel_context(ctx);
 386
 387    intel_flush(ctx);
 388    intel_flush_front(ctx);
 389    if (intel->is_front_buffer_rendering)
 390       intel->need_throttle = true;
 391 }
 392
 393 void
 394 intelFinish(struct gl_context * ctx)
 395 {
 396    struct intel_context *intel = intel_context(ctx);
 397
 398    intel_flush(ctx);
 399    intel_flush_front(ctx);
 400
 401    if (intel->batch.last_bo)
 402       drm_intel_bo_wait_rendering(intel->batch.last_bo);
 403 }
 404
 405 void
 406 intelInitDriverFunctions(struct dd_function_table *functions)
 407 {
 408    _mesa_init_driver_functions(functions);
 409
 410    functions->Flush = intel_glFlush;
 411    functions->Finish = intelFinish;
 412    functions->GetString = intelGetString;
 413    functions->UpdateState = intelInvalidateState;
 414
 415    intelInitTextureFuncs(functions);
 416    intelInitTextureImageFuncs(functions);
 417    intelInitTextureSubImageFuncs(functions);
 418    intelInitTextureCopyImageFuncs(functions);
 419    intelInitClearFuncs(functions);
 420    intelInitBufferFuncs(functions);
 421    intelInitPixelFuncs(functions);
 422    intelInitBufferObjectFuncs(functions);
 423    intel_init_syncobj_functions(functions);
 424 }
 425
 426 static bool
 427 validate_context_version(struct intel_screen *screen,
 428                          int mesa_api,
 429                          unsigned major_version,
 430                          unsigned minor_version,
 431                          unsigned *dri_ctx_error)
 432 {
 433    unsigned req_version = 10 * major_version + minor_version;
 434    unsigned max_version = 0;
 435
 436    switch (mesa_api) {
 437    case API_OPENGL_COMPAT:
 438       max_version = screen->max_gl_compat_version;
 439       break;
 440    case API_OPENGL_CORE:
 441       max_version = screen->max_gl_core_version;
 442       break;
 443    case API_OPENGLES:
 444       max_version = screen->max_gl_es1_version;
 445       break;
 446    case API_OPENGLES2:
 447       max_version = screen->max_gl_es2_version;
 448       break;
 449    default:
 450       max_version = 0;
 451       break;
 452    }
 453
 454    if (max_version == 0) {
 455       *dri_ctx_error = __DRI_CTX_ERROR_BAD_API;
 456       return false;
 457    } else if (req_version > max_version) {
 458       *dri_ctx_error = __DRI_CTX_ERROR_BAD_VERSION;
 459       return false;
 460    }
 461
 462    return true;
 463 }
 464
 465 bool
 466 intelInitContext(struct intel_context *intel,
 467                  int api,
 468                  unsigned major_version,
 469                  unsigned minor_version,
 470                  const struct gl_config * mesaVis,
 471                  __DRIcontext * driContextPriv,
 472                  void *sharedContextPrivate,
 473                  struct dd_function_table *functions,
 474                  unsigned *dri_ctx_error)
 475 {
 476    struct gl_context *ctx = &intel->ctx;
 477    struct gl_context *shareCtx = (struct gl_context *) sharedContextPrivate;
 478    __DRIscreen *sPriv = driContextPriv->driScreenPriv;
 479    struct intel_screen *intelScreen = sPriv->driverPrivate;
 480    int bo_reuse_mode;
 481    struct gl_config visual;
 482
 483    /* we can't do anything without a connection to the device */
 484    if (intelScreen->bufmgr == NULL) {
 485       *dri_ctx_error = __DRI_CTX_ERROR_NO_MEMORY;
 486       return false;
 487    }
 488
 489    if (!validate_context_version(intelScreen,
 490                                  api, major_version, minor_version,
 491                                  dri_ctx_error))
 492       return false;
 493
 494    /* Can't rely on invalidate events, fall back to glViewport hack */
 495    if (!driContextPriv->driScreenPriv->dri2.useInvalidate) {
 496       intel->saved_viewport = functions->Viewport;
 497       functions->Viewport = intel_viewport;
 498    }
 499
 500    if (mesaVis == NULL) {
 501       memset(&visual, 0, sizeof visual);
 502       mesaVis = &visual;
 503    }
 504
 505    intel->intelScreen = intelScreen;
 506
 507    if (!_mesa_initialize_context(&intel->ctx, api, mesaVis, shareCtx,
 508                                  functions)) {
 509       *dri_ctx_error = __DRI_CTX_ERROR_NO_MEMORY;
 510       printf("%s: failed to init mesa context\n", __FUNCTION__);
 511       return false;
 512    }
 513
 514    driContextPriv->driverPrivate = intel;
 515    intel->driContext = driContextPriv;
 516    intel->driFd = sPriv->fd;
 517
 518    intel->gen = intelScreen->gen;
 519
 520    const int devID = intelScreen->deviceID;
 521    if (IS_SNB_GT1(devID) || IS_IVB_GT1(devID) || IS_HSW_GT1(devID))
 522       intel->gt = 1;
 523    else if (IS_SNB_GT2(devID) || IS_IVB_GT2(devID) || IS_HSW_GT2(devID))
 524       intel->gt = 2;
 525    else if (IS_HSW_GT3(devID))
 526       intel->gt = 3;
 527    else
 528       intel->gt = 0;
 529
 530    if (IS_HASWELL(devID)) {
 531       intel->is_haswell = true;
 532    } else if (IS_BAYTRAIL(devID)) {
 533       intel->is_baytrail = true;
 534       intel->gt = 1;
 535    } else if (IS_G4X(devID)) {
 536       intel->is_g4x = true;
 537    } else if (IS_945(devID)) {
 538       intel->is_945 = true;
 539    }
 540
 541    if (intel->gen >= 5) {
 542       intel->needs_ff_sync = true;
 543    }
 544
 545    intel->has_separate_stencil = intel->intelScreen->hw_has_separate_stencil;
 546    intel->must_use_separate_stencil = intel->intelScreen->hw_must_use_separate_stencil;
 547    intel->has_hiz = intel->gen >= 6;
 548    intel->has_llc = intel->intelScreen->hw_has_llc;
 549    intel->has_swizzling = intel->intelScreen->hw_has_swizzling;
 550
 551    memset(&ctx->TextureFormatSupported,
 552           0, sizeof(ctx->TextureFormatSupported));
 553
 554    driParseConfigFiles(&intel->optionCache, &intelScreen->optionCache,
 555                        sPriv->myNum, (intel->gen >= 4) ? "i965" : "i915");
 556    if (intel->gen < 4)
 557       intel->maxBatchSize = 4096;
 558    else
 559       intel->maxBatchSize = BATCH_SZ;
 560
 561    /* Estimate the size of the mappable aperture into the GTT.  There's an
 562     * ioctl to get the whole GTT size, but not one to get the mappable subset.
 563     * It turns out it's basically always 256MB, though some ancient hardware
 564     * was smaller.
 565     */
 566    uint32_t gtt_size = 256 * 1024 * 1024;
 567    if (intel->gen == 2)
 568       gtt_size = 128 * 1024 * 1024;
 569
 570    /* We don't want to map two objects such that a memcpy between them would
 571     * just fault one mapping in and then the other over and over forever.  So
 572     * we would need to divide the GTT size by 2.  Additionally, some GTT is
 573     * taken up by things like the framebuffer and the ringbuffer and such, so
 574     * be more conservative.
 575     */
 576    intel->max_gtt_map_object_size = gtt_size / 4;
 577
 578    intel->bufmgr = intelScreen->bufmgr;
 579
 580    bo_reuse_mode = driQueryOptioni(&intel->optionCache, "bo_reuse");
 581    switch (bo_reuse_mode) {
 582    case DRI_CONF_BO_REUSE_DISABLED:
 583       break;
 584    case DRI_CONF_BO_REUSE_ALL:
 585       intel_bufmgr_gem_enable_reuse(intel->bufmgr);
 586       break;
 587    }
 588
 589    ctx->Const.MinLineWidth = 1.0;
 590    ctx->Const.MinLineWidthAA = 1.0;
 591    ctx->Const.MaxLineWidth = 5.0;
 592    ctx->Const.MaxLineWidthAA = 5.0;
 593    ctx->Const.LineWidthGranularity = 0.5;
 594
 595    ctx->Const.MinPointSize = 1.0;
 596    ctx->Const.MinPointSizeAA = 1.0;
 597    ctx->Const.MaxPointSize = 255.0;
 598    ctx->Const.MaxPointSizeAA = 3.0;
 599    ctx->Const.PointSizeGranularity = 1.0;
 600
 601    if (intel->gen >= 6)
 602       ctx->Const.MaxClipPlanes = 8;
 603
 604    ctx->Const.StripTextureBorder = GL_TRUE;
 605
 606    /* reinitialize the context point state.
 607     * It depend on constants in __struct gl_contextRec::Const
 608     */
 609    _mesa_init_point(ctx);
 610
 611    if (intel->gen >= 4) {
 612       ctx->Const.MaxRenderbufferSize = 8192;
 613    } else {
 614       ctx->Const.MaxRenderbufferSize = 2048;
 615    }
 616
 617    /* Initialize the software rasterizer and helper modules.
 618     *
 619     * As of GL 3.1 core, the gen4+ driver doesn't need the swrast context for
 620     * software fallbacks (which we have to support on legacy GL to do weird
 621     * glDrawPixels(), glBitmap(), and other functions).
 622     */
 623    if (intel->gen <= 3 || api != API_OPENGL_CORE) {
 624       _swrast_CreateContext(ctx);
 625    }
 626
 627    _vbo_CreateContext(ctx);
 628    if (ctx->swrast_context) {
 629       _tnl_CreateContext(ctx);
 630       _swsetup_CreateContext(ctx);
 631
 632       /* Configure swrast to match hardware characteristics: */
 633       _swrast_allow_pixel_fog(ctx, false);
 634       _swrast_allow_vertex_fog(ctx, true);
 635    }
 636
 637    _mesa_meta_init(ctx);
 638
 639    intel->hw_stencil = mesaVis->stencilBits && mesaVis->depthBits == 24;
 640    intel->hw_stipple = 1;
 641
 642    intel->RenderIndex = ~0;
 643
 644    intelInitExtensions(ctx);
 645
 646    INTEL_DEBUG = driParseDebugString(getenv("INTEL_DEBUG"), debug_control);
 647    if (INTEL_DEBUG & DEBUG_BUFMGR)
 648       dri_bufmgr_set_debug(intel->bufmgr, true);
 649    if ((INTEL_DEBUG & DEBUG_SHADER_TIME) && intel->gen < 7) {
 650       fprintf(stderr,
 651               "shader_time debugging requires gen7 (Ivybridge) or better.\n");
 652       INTEL_DEBUG &= ~DEBUG_SHADER_TIME;
 653    }
 654    if (INTEL_DEBUG & DEBUG_PERF)
 655       intel->perf_debug = true;
 656
 657    if (INTEL_DEBUG & DEBUG_AUB)
 658       drm_intel_bufmgr_gem_set_aub_dump(intel->bufmgr, true);
 659
 660    intel_batchbuffer_init(intel);
 661
 662    intel_fbo_init(intel);
 663
 664    intel->use_early_z = driQueryOptionb(&intel->optionCache, "early_z");
 665
 666    if (!driQueryOptionb(&intel->optionCache, "hiz")) {
 667        intel->has_hiz = false;
 668        /* On gen6, you can only do separate stencil with HIZ. */
 669        if (intel->gen == 6)
 670           intel->has_separate_stencil = false;
 671    }
 672
 673    intel->prim.primitive = ~0;
 674
 675    /* Force all software fallbacks */
 676 #ifdef I915
 677    if (driQueryOptionb(&intel->optionCache, "no_rast")) {
 678       fprintf(stderr, "disabling 3D rasterization\n");
 679       intel->no_rast = 1;
 680    }
 681 #endif
 682
 683    if (driQueryOptionb(&intel->optionCache, "always_flush_batch")) {
 684       fprintf(stderr, "flushing batchbuffer before/after each draw call\n");
 685       intel->always_flush_batch = 1;
 686    }
 687
 688    if (driQueryOptionb(&intel->optionCache, "always_flush_cache")) {
 689       fprintf(stderr, "flushing GPU caches before/after each draw call\n");
 690       intel->always_flush_cache = 1;
 691    }
 692
 693    if (driQueryOptionb(&intel->optionCache, "disable_throttling")) {
 694       fprintf(stderr, "disabling flush throttling\n");
 695       intel->disable_throttling = 1;
 696    }
 697
 698    return true;
 699 }
 700
 701 void
 702 intelDestroyContext(__DRIcontext * driContextPriv)
 703 {
 704    struct intel_context *intel =
 705       (struct intel_context *) driContextPriv->driverPrivate;
 706    struct gl_context *ctx = &intel->ctx;
 707
 708    assert(intel);               /* should never be null */
 709    if (intel) {
 710       INTEL_FIREVERTICES(intel);
 711
 712       /* Dump a final BMP in case the application doesn't call SwapBuffers */
 713       if (INTEL_DEBUG & DEBUG_AUB) {
 714          intel_batchbuffer_flush(intel);
 715          aub_dump_bmp(&intel->ctx);
 716       }
 717
 718       _mesa_meta_free(&intel->ctx);
 719
 720       intel->vtbl.destroy(intel);
 721
 722       if (ctx->swrast_context) {
 723          _swsetup_DestroyContext(&intel->ctx);
 724          _tnl_DestroyContext(&intel->ctx);
 725       }
 726       _vbo_DestroyContext(&intel->ctx);
 727
 728       if (ctx->swrast_context)
 729          _swrast_DestroyContext(&intel->ctx);
 730       intel->Fallback = 0x0;      /* don't call _swrast_Flush later */
 731
 732       intel_batchbuffer_free(intel);
 733
 734       free(intel->prim.vb);
 735       intel->prim.vb = NULL;
 736       drm_intel_bo_unreference(intel->prim.vb_bo);
 737       intel->prim.vb_bo = NULL;
 738       drm_intel_bo_unreference(intel->first_post_swapbuffers_batch);
 739       intel->first_post_swapbuffers_batch = NULL;
 740
 741       driDestroyOptionCache(&intel->optionCache);
 742
 743       /* free the Mesa context */
 744       _mesa_free_context_data(&intel->ctx);
 745
 746       _math_matrix_dtr(&intel->ViewportMatrix);
 747
 748       ralloc_free(intel);
 749       driContextPriv->driverPrivate = NULL;
 750    }
 751 }
 752
 753 GLboolean
 754 intelUnbindContext(__DRIcontext * driContextPriv)
 755 {
 756    /* Unset current context and dispath table */
 757    _mesa_make_current(NULL, NULL, NULL);
 758
 759    return true;
 760 }
 761
 762 /**
 763  * Fixes up the context for GLES23 with our default-to-sRGB-capable behavior
 764  * on window system framebuffers.
 765  *
 766  * Desktop GL is fairly reasonable in its handling of sRGB: You can ask if
 767  * your renderbuffer can do sRGB encode, and you can flip a switch that does
 768  * sRGB encode if the renderbuffer can handle it.  You can ask specifically
 769  * for a visual where you're guaranteed to be capable, but it turns out that
 770  * everyone just makes all their ARGB8888 visuals capable and doesn't offer
 771  * incapable ones, becuase there's no difference between the two in resources
 772  * used.  Applications thus get built that accidentally rely on the default
 773  * visual choice being sRGB, so we make ours sRGB capable.  Everything sounds
 774  * great...
 775  *
 776  * But for GLES2/3, they decided that it was silly to not turn on sRGB encode
 777  * for sRGB renderbuffers you made with the GL_EXT_texture_sRGB equivalent.
 778  * So they removed the enable knob and made it "if the renderbuffer is sRGB
 779  * capable, do sRGB encode".  Then, for your window system renderbuffers, you
 780  * can ask for sRGB visuals and get sRGB encode, or not ask for sRGB visuals
 781  * and get no sRGB encode (assuming that both kinds of visual are available).
 782  * Thus our choice to support sRGB by default on our visuals for desktop would
 783  * result in broken rendering of GLES apps that aren't expecting sRGB encode.
 784  *
 785  * Unfortunately, renderbuffer setup happens before a context is created.  So
 786  * in intel_screen.c we always set up sRGB, and here, if you're a GLES2/3
 787  * context (without an sRGB visual, though we don't have sRGB visuals exposed
 788  * yet), we go turn that back off before anyone finds out.
 789  */
 790 static void
 791 intel_gles3_srgb_workaround(struct intel_context *intel,
 792                             struct gl_framebuffer *fb)
 793 {
 794    struct gl_context *ctx = &intel->ctx;
 795
 796    if (_mesa_is_desktop_gl(ctx) || !fb->Visual.sRGBCapable)
 797       return;
 798
 799    /* Some day when we support the sRGB capable bit on visuals available for
 800     * GLES, we'll need to respect that and not disable things here.
 801     */
 802    fb->Visual.sRGBCapable = false;
 803    for (int i = 0; i < BUFFER_COUNT; i++) {
 804       if (fb->Attachment[i].Renderbuffer &&
 805           fb->Attachment[i].Renderbuffer->Format == MESA_FORMAT_SARGB8) {
 806          fb->Attachment[i].Renderbuffer->Format = MESA_FORMAT_ARGB8888;
 807       }
 808    }
 809 }
 810
 811 GLboolean
 812 intelMakeCurrent(__DRIcontext * driContextPriv,
 813                  __DRIdrawable * driDrawPriv,
 814                  __DRIdrawable * driReadPriv)
 815 {
 816    struct intel_context *intel;
 817    GET_CURRENT_CONTEXT(curCtx);
 818
 819    if (driContextPriv)
 820       intel = (struct intel_context *) driContextPriv->driverPrivate;
 821    else
 822       intel = NULL;
 823
 824    /* According to the glXMakeCurrent() man page: "Pending commands to
 825     * the previous context, if any, are flushed before it is released."
 826     * But only flush if we're actually changing contexts.
 827     */
 828    if (intel_context(curCtx) && intel_context(curCtx) != intel) {
 829       _mesa_flush(curCtx);
 830    }
 831
 832    if (driContextPriv) {
 833       struct gl_context *ctx = &intel->ctx;
 834       struct gl_framebuffer *fb, *readFb;
 835
 836       if (driDrawPriv == NULL && driReadPriv == NULL) {
 837          fb = _mesa_get_incomplete_framebuffer();
 838          readFb = _mesa_get_incomplete_framebuffer();
 839       } else {
 840          fb = driDrawPriv->driverPrivate;
 841          readFb = driReadPriv->driverPrivate;
 842          driContextPriv->dri2.draw_stamp = driDrawPriv->dri2.stamp - 1;
 843          driContextPriv->dri2.read_stamp = driReadPriv->dri2.stamp - 1;
 844       }
 845
 846       intel_prepare_render(intel);
 847       _mesa_make_current(ctx, fb, readFb);
 848
 849       intel_gles3_srgb_workaround(intel, ctx->WinSysDrawBuffer);
 850       intel_gles3_srgb_workaround(intel, ctx->WinSysReadBuffer);
 851
 852       /* We do this in intel_prepare_render() too, but intel->ctx.DrawBuffer
 853        * is NULL at that point.  We can't call _mesa_makecurrent()
 854        * first, since we need the buffer size for the initial
 855        * viewport.  So just call intel_draw_buffer() again here. */
 856       intel_draw_buffer(ctx);
 857    }
 858    else {
 859       _mesa_make_current(NULL, NULL, NULL);
 860    }
 861
 862    return true;
 863 }
 864
 865 /**
 866  * \brief Query DRI2 to obtain a DRIdrawable's buffers.
 867  *
 868  * To determine which DRI buffers to request, examine the renderbuffers
 869  * attached to the drawable's framebuffer. Then request the buffers with
 870  * DRI2GetBuffers() or DRI2GetBuffersWithFormat().
 871  *
 872  * This is called from intel_update_renderbuffers().
 873  *
 874  * \param drawable      Drawable whose buffers are queried.
 875  * \param buffers       [out] List of buffers returned by DRI2 query.
 876  * \param buffer_count  [out] Number of buffers returned.
 877  *
 878  * \see intel_update_renderbuffers()
 879  * \see DRI2GetBuffers()
 880  * \see DRI2GetBuffersWithFormat()
 881  */
 882 static void
 883 intel_query_dri2_buffers(struct intel_context *intel,
 884                          __DRIdrawable *drawable,
 885                          __DRIbuffer **buffers,
 886                          int *buffer_count)
 887 {
 888    __DRIscreen *screen = intel->intelScreen->driScrnPriv;
 889    struct gl_framebuffer *fb = drawable->driverPrivate;
 890    int i = 0;
 891    unsigned attachments[8];
 892
 893    struct intel_renderbuffer *front_rb;
 894    struct intel_renderbuffer *back_rb;
 895
 896    front_rb = intel_get_renderbuffer(fb, BUFFER_FRONT_LEFT);
 897    back_rb = intel_get_renderbuffer(fb, BUFFER_BACK_LEFT);
 898
 899    memset(attachments, 0, sizeof(attachments));
 900    if ((intel->is_front_buffer_rendering ||
 901         intel->is_front_buffer_reading ||
 902         !back_rb) && front_rb) {
 903       /* If a fake front buffer is in use, then querying for
 904        * __DRI_BUFFER_FRONT_LEFT will cause the server to copy the image from
 905        * the real front buffer to the fake front buffer.  So before doing the
 906        * query, we need to make sure all the pending drawing has landed in the
 907        * real front buffer.
 908        */
 909       intel_flush(&intel->ctx);
 910       intel_flush_front(&intel->ctx);
 911
 912       attachments[i++] = __DRI_BUFFER_FRONT_LEFT;
 913       attachments[i++] = intel_bits_per_pixel(front_rb);
 914    } else if (front_rb && intel->front_buffer_dirty) {
 915       /* We have pending front buffer rendering, but we aren't querying for a
 916        * front buffer.  If the front buffer we have is a fake front buffer,
 917        * the X server is going to throw it away when it processes the query.
 918        * So before doing the query, make sure all the pending drawing has
 919        * landed in the real front buffer.
 920        */
 921       intel_flush(&intel->ctx);
 922       intel_flush_front(&intel->ctx);
 923    }
 924
 925    if (back_rb) {
 926       attachments[i++] = __DRI_BUFFER_BACK_LEFT;
 927       attachments[i++] = intel_bits_per_pixel(back_rb);
 928    }
 929
 930    assert(i <= ARRAY_SIZE(attachments));
 931
 932    *buffers = screen->dri2.loader->getBuffersWithFormat(drawable,
 933                                                         &drawable->w,
 934                                                         &drawable->h,
 935                                                         attachments, i / 2,
 936                                                         buffer_count,
 937                                                         drawable->loaderPrivate);
 938 }
 939
 940 /**
 941  * \brief Assign a DRI buffer's DRM region to a renderbuffer.
 942  *
 943  * This is called from intel_update_renderbuffers().
 944  *
 945  * \par Note:
 946  *    DRI buffers whose attachment point is DRI2BufferStencil or
 947  *    DRI2BufferDepthStencil are handled as special cases.
 948  *
 949  * \param buffer_name is a human readable name, such as "dri2 front buffer",
 950  *        that is passed to intel_region_alloc_for_handle().
 951  *
 952  * \see intel_update_renderbuffers()
 953  * \see intel_region_alloc_for_handle()
 954  */
 955 static void
 956 intel_process_dri2_buffer(struct intel_context *intel,
 957                           __DRIdrawable *drawable,
 958                           __DRIbuffer *buffer,
 959                           struct intel_renderbuffer *rb,
 960                           const char *buffer_name)
 961 {
 962    struct intel_region *region = NULL;
 963
 964    if (!rb)
 965       return;
 966
 967    unsigned num_samples = rb->Base.Base.NumSamples;
 968
 969    /* We try to avoid closing and reopening the same BO name, because the first
 970     * use of a mapping of the buffer involves a bunch of page faulting which is
 971     * moderately expensive.
 972     */
 973    if (num_samples == 0) {
 974        if (rb->mt &&
 975            rb->mt->region &&
 976            rb->mt->region->name == buffer->name)
 977           return;
 978    } else {
 979        if (rb->mt &&
 980            rb->mt->singlesample_mt &&
 981            rb->mt->singlesample_mt->region &&
 982            rb->mt->singlesample_mt->region->name == buffer->name)
 983           return;
 984    }
 985
 986    if (unlikely(INTEL_DEBUG & DEBUG_DRI)) {
 987       fprintf(stderr,
 988               "attaching buffer %d, at %d, cpp %d, pitch %d\n",
 989               buffer->name, buffer->attachment,
 990               buffer->cpp, buffer->pitch);
 991    }
 992
 993    intel_miptree_release(&rb->mt);
 994    region = intel_region_alloc_for_handle(intel->intelScreen,
 995                                           buffer->cpp,
 996                                           drawable->w,
 997                                           drawable->h,
 998                                           buffer->pitch,
 999                                           buffer->name,
1000                                           buffer_name);
1001    if (!region)
1002       return;
1003
1004    rb->mt = intel_miptree_create_for_dri2_buffer(intel,
1005                                                  buffer->attachment,
1006                                                  intel_rb_format(rb),
1007                                                  num_samples,
1008                                                  region);
1009    intel_region_release(&region);
1010 }