src/mesa/drivers/dri/intel/intel_fbo.c

   1 /**************************************************************************
   2  *
   3  * Copyright 2006 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/imports.h"
  30 #include "main/macros.h"
  31 #include "main/mtypes.h"
  32 #include "main/fbobject.h"
  33 #include "main/framebuffer.h"
  34 #include "main/renderbuffer.h"
  35 #include "main/context.h"
  36 #include "main/texrender.h"
  37 #include "drivers/common/meta.h"
  38
  39 #include "intel_context.h"
  40 #include "intel_buffers.h"
  41 #include "intel_fbo.h"
  42 #include "intel_mipmap_tree.h"
  43 #include "intel_regions.h"
  44
  45
  46 #define FILE_DEBUG_FLAG DEBUG_FBO
  47
  48
  49 /**
  50  * Create a new framebuffer object.
  51  */
  52 static struct gl_framebuffer *
  53 intel_new_framebuffer(GLcontext * ctx, GLuint name)
  54 {
  55    /* Only drawable state in intel_framebuffer at this time, just use Mesa's
  56     * class
  57     */
  58    return _mesa_new_framebuffer(ctx, name);
  59 }
  60
  61
  62 /** Called by gl_renderbuffer::Delete() */
  63 static void
  64 intel_delete_renderbuffer(struct gl_renderbuffer *rb)
  65 {
  66    GET_CURRENT_CONTEXT(ctx);
  67    struct intel_context *intel = intel_context(ctx);
  68    struct intel_renderbuffer *irb = intel_renderbuffer(rb);
  69
  70    ASSERT(irb);
  71
  72    if (irb->span_cache != NULL)
  73       _mesa_free(irb->span_cache);
  74
  75    if (intel && irb->region) {
  76       intel_region_release(&irb->region);
  77    }
  78
  79    _mesa_free(irb);
  80 }
  81
  82
  83 /**
  84  * Return a pointer to a specific pixel in a renderbuffer.
  85  */
  86 static void *
  87 intel_get_pointer(GLcontext * ctx, struct gl_renderbuffer *rb,
  88                   GLint x, GLint y)
  89 {
  90    /* By returning NULL we force all software rendering to go through
  91     * the span routines.
  92     */
  93    return NULL;
  94 }
  95
  96
  97 /**
  98  * Called via glRenderbufferStorageEXT() to set the format and allocate
  99  * storage for a user-created renderbuffer.
 100  */
 101 static GLboolean
 102 intel_alloc_renderbuffer_storage(GLcontext * ctx, struct gl_renderbuffer *rb,
 103                                  GLenum internalFormat,
 104                                  GLuint width, GLuint height)
 105 {
 106    struct intel_context *intel = intel_context(ctx);
 107    struct intel_renderbuffer *irb = intel_renderbuffer(rb);
 108    GLboolean softwareBuffer = GL_FALSE;
 109    int cpp;
 110
 111    ASSERT(rb->Name != 0);
 112
 113    switch (internalFormat) {
 114    case GL_R3_G3_B2:
 115    case GL_RGB4:
 116    case GL_RGB5:
 117       rb->Format = MESA_FORMAT_RGB565;
 118       rb->DataType = GL_UNSIGNED_BYTE;
 119       irb->texformat = MESA_FORMAT_RGB565;
 120       cpp = 2;
 121       break;
 122    case GL_RGB:
 123    case GL_RGB8:
 124    case GL_RGB10:
 125    case GL_RGB12:
 126    case GL_RGB16:
 127       rb->Format = MESA_FORMAT_ARGB8888;
 128       rb->DataType = GL_UNSIGNED_BYTE;
 129       irb->texformat = MESA_FORMAT_ARGB8888; /* XXX: Need xrgb8888 */
 130       cpp = 4;
 131       break;
 132    case GL_RGBA:
 133    case GL_RGBA2:
 134    case GL_RGBA4:
 135    case GL_RGB5_A1:
 136    case GL_RGBA8:
 137    case GL_RGB10_A2:
 138    case GL_RGBA12:
 139    case GL_RGBA16:
 140       rb->Format = MESA_FORMAT_ARGB8888;
 141       rb->DataType = GL_UNSIGNED_BYTE;
 142       irb->texformat = MESA_FORMAT_ARGB8888;
 143       cpp = 4;
 144       break;
 145    case GL_STENCIL_INDEX:
 146    case GL_STENCIL_INDEX1_EXT:
 147    case GL_STENCIL_INDEX4_EXT:
 148    case GL_STENCIL_INDEX8_EXT:
 149    case GL_STENCIL_INDEX16_EXT:
 150       /* alloc a depth+stencil buffer */
 151       rb->Format = MESA_FORMAT_Z24_S8;
 152       rb->DataType = GL_UNSIGNED_INT_24_8_EXT;
 153       cpp = 4;
 154       irb->texformat = MESA_FORMAT_Z24_S8;
 155       break;
 156    case GL_DEPTH_COMPONENT16:
 157       rb->Format = MESA_FORMAT_Z16;
 158       rb->DataType = GL_UNSIGNED_SHORT;
 159       cpp = 2;
 160       irb->texformat = MESA_FORMAT_Z16;
 161       break;
 162    case GL_DEPTH_COMPONENT:
 163    case GL_DEPTH_COMPONENT24:
 164    case GL_DEPTH_COMPONENT32:
 165       rb->Format = MESA_FORMAT_Z24_S8;
 166       rb->DataType = GL_UNSIGNED_INT_24_8_EXT;
 167       cpp = 4;
 168       irb->texformat = MESA_FORMAT_Z24_S8;
 169       break;
 170    case GL_DEPTH_STENCIL_EXT:
 171    case GL_DEPTH24_STENCIL8_EXT:
 172       rb->Format = MESA_FORMAT_Z24_S8;
 173       rb->DataType = GL_UNSIGNED_INT_24_8_EXT;
 174       cpp = 4;
 175       irb->texformat = MESA_FORMAT_Z24_S8;
 176       break;
 177    default:
 178       _mesa_problem(ctx,
 179                     "Unexpected format in intel_alloc_renderbuffer_storage");
 180       return GL_FALSE;
 181    }
 182
 183    rb->_BaseFormat = _mesa_base_fbo_format(ctx, internalFormat);
 184
 185    intelFlush(ctx);
 186
 187    /* free old region */
 188    if (irb->region) {
 189       intel_region_release(&irb->region);
 190    }
 191
 192    /* allocate new memory region/renderbuffer */
 193    if (softwareBuffer) {
 194       return _mesa_soft_renderbuffer_storage(ctx, rb, internalFormat,
 195                                              width, height);
 196    }
 197    else {
 198       /* Choose a pitch to match hardware requirements:
 199        */
 200       GLuint pitch = ((cpp * width + 63) & ~63) / cpp;
 201
 202       /* alloc hardware renderbuffer */
 203       DBG("Allocating %d x %d Intel RBO (pitch %d)\n", width,
 204           height, pitch);
 205
 206       irb->region = intel_region_alloc(intel, I915_TILING_NONE,
 207                                        cpp, width, height, pitch,
 208                                        GL_TRUE);
 209       if (!irb->region)
 210          return GL_FALSE;       /* out of memory? */
 211
 212       ASSERT(irb->region->buffer);
 213
 214       rb->Width = width;
 215       rb->Height = height;
 216
 217       return GL_TRUE;
 218    }
 219 }
 220
 221
 222 /**
 223  * Called for each hardware renderbuffer when a _window_ is resized.
 224  * Just update fields.
 225  * Not used for user-created renderbuffers!
 226  */
 227 static GLboolean
 228 intel_alloc_window_storage(GLcontext * ctx, struct gl_renderbuffer *rb,
 229                            GLenum internalFormat, GLuint width, GLuint height)
 230 {
 231    ASSERT(rb->Name == 0);
 232    rb->Width = width;
 233    rb->Height = height;
 234    rb->InternalFormat = internalFormat;
 235
 236    return GL_TRUE;
 237 }
 238
 239
 240 static void
 241 intel_resize_buffers(GLcontext *ctx, struct gl_framebuffer *fb,
 242                      GLuint width, GLuint height)
 243 {
 244    struct intel_framebuffer *intel_fb = (struct intel_framebuffer*)fb;
 245    int i;
 246
 247    _mesa_resize_framebuffer(ctx, fb, width, height);
 248
 249    fb->Initialized = GL_TRUE; /* XXX remove someday */
 250
 251    if (fb->Name != 0) {
 252       return;
 253    }
 254
 255    /* Make sure all window system renderbuffers are up to date */
 256    for (i = 0; i < 2; i++) {
 257       struct gl_renderbuffer *rb = &intel_fb->color_rb[i]->Base;
 258
 259       /* only resize if size is changing */
 260       if (rb && (rb->Width != width || rb->Height != height)) {
 261          rb->AllocStorage(ctx, rb, rb->InternalFormat, width, height);
 262       }
 263    }
 264 }
 265
 266
 267 /** Dummy function for gl_renderbuffer::AllocStorage() */
 268 static GLboolean
 269 intel_nop_alloc_storage(GLcontext * ctx, struct gl_renderbuffer *rb,
 270                         GLenum internalFormat, GLuint width, GLuint height)
 271 {
 272    _mesa_problem(ctx, "intel_op_alloc_storage should never be called.");
 273    return GL_FALSE;
 274 }
 275
 276
 277 void
 278 intel_renderbuffer_set_region(struct intel_renderbuffer *rb,
 279                               struct intel_region *region)
 280 {
 281    struct intel_region *old;
 282
 283    old = rb->region;
 284    rb->region = NULL;
 285    intel_region_reference(&rb->region, region);
 286    intel_region_release(&old);
 287 }
 288
 289
 290 /**
 291  * Create a new intel_renderbuffer which corresponds to an on-screen window,
 292  * not a user-created renderbuffer.
 293  */
 294 struct intel_renderbuffer *
 295 intel_create_renderbuffer(GLenum intFormat)
 296 {
 297    GET_CURRENT_CONTEXT(ctx);
 298
 299    struct intel_renderbuffer *irb;
 300    const GLuint name = 0;
 301
 302    irb = CALLOC_STRUCT(intel_renderbuffer);
 303    if (!irb) {
 304       _mesa_error(ctx, GL_OUT_OF_MEMORY, "creating renderbuffer");
 305       return NULL;
 306    }
 307
 308    _mesa_init_renderbuffer(&irb->Base, name);
 309    irb->Base.ClassID = INTEL_RB_CLASS;
 310
 311    switch (intFormat) {
 312    case GL_RGB5:
 313       irb->Base.Format = MESA_FORMAT_RGB565;
 314       irb->Base._BaseFormat = GL_RGB;
 315       irb->Base.DataType = GL_UNSIGNED_BYTE;
 316       irb->texformat = MESA_FORMAT_RGB565;
 317       break;
 318    case GL_RGB8:
 319       irb->Base.Format = MESA_FORMAT_ARGB8888; /* XXX: NEED XRGB8888 */
 320       irb->Base._BaseFormat = GL_RGB;
 321       irb->Base.DataType = GL_UNSIGNED_BYTE;
 322       irb->texformat = MESA_FORMAT_ARGB8888; /* XXX: NEED XRGB8888 */
 323       break;
 324    case GL_RGBA8:
 325       irb->Base.Format = MESA_FORMAT_ARGB8888;
 326       irb->Base._BaseFormat = GL_RGBA;
 327       irb->Base.DataType = GL_UNSIGNED_BYTE;
 328       irb->texformat = MESA_FORMAT_ARGB8888;
 329       break;
 330    case GL_STENCIL_INDEX8_EXT:
 331       irb->Base.Format = MESA_FORMAT_Z24_S8;
 332       irb->Base._BaseFormat = GL_STENCIL_INDEX;
 333       irb->Base.DataType = GL_UNSIGNED_BYTE;
 334       irb->texformat = MESA_FORMAT_Z24_S8;
 335       break;
 336    case GL_DEPTH_COMPONENT16:
 337       irb->Base.Format = MESA_FORMAT_Z16;
 338       irb->Base._BaseFormat = GL_DEPTH_COMPONENT;
 339       irb->Base.DataType = GL_UNSIGNED_SHORT;
 340       irb->texformat = MESA_FORMAT_Z16;
 341       break;
 342    case GL_DEPTH_COMPONENT24:
 343       irb->Base.Format = MESA_FORMAT_Z24_S8;
 344       irb->Base._BaseFormat = GL_DEPTH_COMPONENT;
 345       irb->Base.DataType = GL_UNSIGNED_INT;
 346       irb->texformat = MESA_FORMAT_Z24_S8;
 347       break;
 348    case GL_DEPTH24_STENCIL8_EXT:
 349       irb->Base.Format = MESA_FORMAT_Z24_S8;
 350       irb->Base._BaseFormat = GL_DEPTH_STENCIL;
 351       irb->Base.DataType = GL_UNSIGNED_INT_24_8_EXT;
 352       irb->texformat = MESA_FORMAT_Z24_S8;
 353       break;
 354    default:
 355       _mesa_problem(NULL,
 356                     "Unexpected intFormat in intel_create_renderbuffer");
 357       return NULL;
 358    }
 359
 360    irb->Base.InternalFormat = intFormat;
 361
 362    /* intel-specific methods */
 363    irb->Base.Delete = intel_delete_renderbuffer;
 364    irb->Base.AllocStorage = intel_alloc_window_storage;
 365    irb->Base.GetPointer = intel_get_pointer;
 366
 367    return irb;
 368 }
 369
 370
 371 /**
 372  * Create a new renderbuffer object.
 373  * Typically called via glBindRenderbufferEXT().
 374  */
 375 static struct gl_renderbuffer *
 376 intel_new_renderbuffer(GLcontext * ctx, GLuint name)
 377 {
 378    /*struct intel_context *intel = intel_context(ctx); */
 379    struct intel_renderbuffer *irb;
 380
 381    irb = CALLOC_STRUCT(intel_renderbuffer);
 382    if (!irb) {
 383       _mesa_error(ctx, GL_OUT_OF_MEMORY, "creating renderbuffer");
 384       return NULL;
 385    }
 386
 387    _mesa_init_renderbuffer(&irb->Base, name);
 388    irb->Base.ClassID = INTEL_RB_CLASS;
 389
 390    /* intel-specific methods */
 391    irb->Base.Delete = intel_delete_renderbuffer;
 392    irb->Base.AllocStorage = intel_alloc_renderbuffer_storage;
 393    irb->Base.GetPointer = intel_get_pointer;
 394    /* span routines set in alloc_storage function */
 395
 396    return &irb->Base;
 397 }
 398
 399
 400 /**
 401  * Called via glBindFramebufferEXT().
 402  */
 403 static void
 404 intel_bind_framebuffer(GLcontext * ctx, GLenum target,
 405                        struct gl_framebuffer *fb, struct gl_framebuffer *fbread)
 406 {
 407    if (target == GL_FRAMEBUFFER_EXT || target == GL_DRAW_FRAMEBUFFER_EXT) {
 408       intel_draw_buffer(ctx, fb);
 409    }
 410    else {
 411       /* don't need to do anything if target == GL_READ_FRAMEBUFFER_EXT */
 412    }
 413 }
 414
 415
 416 /**
 417  * Called via glFramebufferRenderbufferEXT().
 418  */
 419 static void
 420 intel_framebuffer_renderbuffer(GLcontext * ctx,
 421                                struct gl_framebuffer *fb,
 422                                GLenum attachment, struct gl_renderbuffer *rb)
 423 {
 424    DBG("Intel FramebufferRenderbuffer %u %u\n", fb->Name, rb ? rb->Name : 0);
 425
 426    intelFlush(ctx);
 427
 428    _mesa_framebuffer_renderbuffer(ctx, fb, attachment, rb);
 429    intel_draw_buffer(ctx, fb);
 430 }
 431
 432
 433 static GLboolean
 434 intel_update_wrapper(GLcontext *ctx, struct intel_renderbuffer *irb,
 435                      struct gl_texture_image *texImage)
 436 {
 437    irb->texformat = texImage->TexFormat;
 438    gl_format texFormat;
 439
 440    if (texImage->TexFormat == MESA_FORMAT_ARGB8888) {
 441       irb->Base.DataType = GL_UNSIGNED_BYTE;
 442       DBG("Render to RGBA8 texture OK\n");
 443    }
 444    else if (texImage->TexFormat == MESA_FORMAT_RGB565) {
 445       irb->Base.DataType = GL_UNSIGNED_BYTE;
 446       DBG("Render to RGB5 texture OK\n");
 447    }
 448    else if (texImage->TexFormat == MESA_FORMAT_ARGB1555) {
 449       irb->Base.DataType = GL_UNSIGNED_BYTE;
 450       DBG("Render to ARGB1555 texture OK\n");
 451    }
 452    else if (texImage->TexFormat == MESA_FORMAT_ARGB4444) {
 453       irb->Base.DataType = GL_UNSIGNED_BYTE;
 454       DBG("Render to ARGB4444 texture OK\n");
 455    }
 456    else if (texImage->TexFormat == MESA_FORMAT_Z16) {
 457       irb->Base.DataType = GL_UNSIGNED_SHORT;
 458       DBG("Render to DEPTH16 texture OK\n");
 459    }
 460    else if (texImage->TexFormat == MESA_FORMAT_Z24_S8) {
 461       irb->Base.DataType = GL_UNSIGNED_INT_24_8_EXT;
 462       DBG("Render to DEPTH_STENCIL texture OK\n");
 463    }
 464    else {
 465       DBG("Render to texture BAD FORMAT %d\n", texImage->TexFormat);
 466       return GL_FALSE;
 467    }
 468
 469    irb->Base.Format = texImage->TexFormat;
 470
 471    texFormat = texImage->TexFormat;
 472
 473    irb->Base.InternalFormat = texImage->InternalFormat;
 474    irb->Base._BaseFormat = _mesa_base_fbo_format(ctx, irb->Base.InternalFormat);
 475    irb->Base.Width = texImage->Width;
 476    irb->Base.Height = texImage->Height;
 477
 478    irb->Base.Delete = intel_delete_renderbuffer;
 479    irb->Base.AllocStorage = intel_nop_alloc_storage;
 480
 481    return GL_TRUE;
 482 }
 483
 484
 485 /**
 486  * When glFramebufferTexture[123]D is called this function sets up the
 487  * gl_renderbuffer wrapper around the texture image.
 488  * This will have the region info needed for hardware rendering.
 489  */
 490 static struct intel_renderbuffer *
 491 intel_wrap_texture(GLcontext * ctx, struct gl_texture_image *texImage)
 492 {
 493    const GLuint name = ~0;   /* not significant, but distinct for debugging */
 494    struct intel_renderbuffer *irb;
 495
 496    /* make an intel_renderbuffer to wrap the texture image */
 497    irb = CALLOC_STRUCT(intel_renderbuffer);
 498    if (!irb) {
 499       _mesa_error(ctx, GL_OUT_OF_MEMORY, "glFramebufferTexture");
 500       return NULL;
 501    }
 502
 503    _mesa_init_renderbuffer(&irb->Base, name);
 504    irb->Base.ClassID = INTEL_RB_CLASS;
 505
 506    if (!intel_update_wrapper(ctx, irb, texImage)) {
 507       _mesa_free(irb);
 508       return NULL;
 509    }
 510
 511    return irb;
 512 }
 513
 514
 515 /**
 516  * Called by glFramebufferTexture[123]DEXT() (and other places) to
 517  * prepare for rendering into texture memory.  This might be called
 518  * many times to choose different texture levels, cube faces, etc
 519  * before intel_finish_render_texture() is ever called.
 520  */
 521 static void
 522 intel_render_texture(GLcontext * ctx,
 523                      struct gl_framebuffer *fb,
 524                      struct gl_renderbuffer_attachment *att)
 525 {
 526    struct gl_texture_image *newImage
 527       = att->Texture->Image[att->CubeMapFace][att->TextureLevel];
 528    struct intel_renderbuffer *irb = intel_renderbuffer(att->Renderbuffer);
 529    struct intel_texture_image *intel_image;
 530    GLuint imageOffset;
 531
 532    (void) fb;
 533
 534    ASSERT(newImage);
 535
 536    intel_image = intel_texture_image(newImage);
 537    if (!intel_image->mt) {
 538       /* Fallback on drawing to a texture that doesn't have a miptree
 539        * (has a border, width/height 0, etc.)
 540        */
 541       _mesa_reference_renderbuffer(&att->Renderbuffer, NULL);
 542       _mesa_render_texture(ctx, fb, att);
 543       return;
 544    }
 545    else if (!irb) {
 546       irb = intel_wrap_texture(ctx, newImage);
 547       if (irb) {
 548          /* bind the wrapper to the attachment point */
 549          _mesa_reference_renderbuffer(&att->Renderbuffer, &irb->Base);
 550       }
 551       else {
 552          /* fallback to software rendering */
 553          _mesa_render_texture(ctx, fb, att);
 554          return;
 555       }
 556    }
 557
 558    if (!intel_update_wrapper(ctx, irb, newImage)) {
 559        _mesa_reference_renderbuffer(&att->Renderbuffer, NULL);
 560        _mesa_render_texture(ctx, fb, att);
 561        return;
 562    }
 563
 564    DBG("Begin render texture tid %x tex=%u w=%d h=%d refcount=%d\n",
 565        _glthread_GetID(),
 566        att->Texture->Name, newImage->Width, newImage->Height,
 567        irb->Base.RefCount);
 568
 569    /* point the renderbufer's region to the texture image region */
 570    if (irb->region != intel_image->mt->region) {
 571       if (irb->region)
 572          intel_region_release(&irb->region);
 573       intel_region_reference(&irb->region, intel_image->mt->region);
 574    }
 575
 576    /* compute offset of the particular 2D image within the texture region */
 577    imageOffset = intel_miptree_image_offset(intel_image->mt,
 578                                             att->CubeMapFace,
 579                                             att->TextureLevel);
 580
 581    if (att->Texture->Target == GL_TEXTURE_3D) {
 582       const GLuint *offsets = intel_miptree_depth_offsets(intel_image->mt,
 583                                                           att->TextureLevel);
 584       imageOffset += offsets[att->Zoffset];
 585    }
 586
 587    /* store that offset in the region */
 588    intel_image->mt->region->draw_offset = imageOffset;
 589
 590    /* update drawing region, etc */
 591    intel_draw_buffer(ctx, fb);
 592 }
 593
 594
 595 /**
 596  * Called by Mesa when rendering to a texture is done.
 597  */
 598 static void
 599 intel_finish_render_texture(GLcontext * ctx,
 600                             struct gl_renderbuffer_attachment *att)
 601 {
 602    /* no-op
 603     * Previously we released the renderbuffer's intel_region but
 604     * that's not necessary and actually caused problems when trying
 605     * to do a glRead/CopyPixels from the renderbuffer later.
 606     * The region will be released later if the texture is replaced
 607     * or the renderbuffer deleted.
 608     *
 609     * The intention of this driver hook is more of a "done rendering
 610     * to texture, please re-twiddle/etc if necessary".
 611     */
 612 }
 613
 614
 615 /**
 616  * Do additional "completeness" testing of a framebuffer object.
 617  */
 618 static void
 619 intel_validate_framebuffer(GLcontext *ctx, struct gl_framebuffer *fb)
 620 {
 621    const struct intel_renderbuffer *depthRb =
 622       intel_get_renderbuffer(fb, BUFFER_DEPTH);
 623    const struct intel_renderbuffer *stencilRb =
 624       intel_get_renderbuffer(fb, BUFFER_STENCIL);
 625    int i;
 626
 627    if (stencilRb && stencilRb != depthRb) {
 628       /* we only support combined depth/stencil buffers, not separate
 629        * stencil buffers.
 630        */
 631       fb->_Status = GL_FRAMEBUFFER_UNSUPPORTED_EXT;
 632    }
 633
 634    for (i = 0; i < ctx->Const.MaxDrawBuffers; i++) {
 635       struct gl_renderbuffer *rb = ctx->DrawBuffer->_ColorDrawBuffers[i];
 636       struct intel_renderbuffer *irb = intel_renderbuffer(rb);
 637
 638       if (rb == NULL)
 639          continue;
 640
 641       if (irb == NULL) {
 642          fb->_Status = GL_FRAMEBUFFER_UNSUPPORTED_EXT;
 643          continue;
 644       }
 645
 646       switch (irb->texformat) {
 647       case MESA_FORMAT_ARGB8888:
 648       case MESA_FORMAT_RGB565:
 649       case MESA_FORMAT_ARGB1555:
 650       case MESA_FORMAT_ARGB4444:
 651          break;
 652       default:
 653          fb->_Status = GL_FRAMEBUFFER_UNSUPPORTED_EXT;
 654       }
 655    }
 656 }
 657
 658
 659 /**
 660  * Do one-time context initializations related to GL_EXT_framebuffer_object.
 661  * Hook in device driver functions.
 662  */
 663 void
 664 intel_fbo_init(struct intel_context *intel)
 665 {
 666    intel->ctx.Driver.NewFramebuffer = intel_new_framebuffer;
 667    intel->ctx.Driver.NewRenderbuffer = intel_new_renderbuffer;
 668    intel->ctx.Driver.BindFramebuffer = intel_bind_framebuffer;
 669    intel->ctx.Driver.FramebufferRenderbuffer = intel_framebuffer_renderbuffer;
 670    intel->ctx.Driver.RenderTexture = intel_render_texture;
 671    intel->ctx.Driver.FinishRenderTexture = intel_finish_render_texture;
 672    intel->ctx.Driver.ResizeBuffers = intel_resize_buffers;
 673    intel->ctx.Driver.ValidateFramebuffer = intel_validate_framebuffer;
 674    intel->ctx.Driver.BlitFramebuffer = _mesa_meta_BlitFramebuffer;
 675 }