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/texformat.h"
  37 #include "main/texrender.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->_ActualFormat = GL_RGB5;
 118       rb->DataType = GL_UNSIGNED_BYTE;
 119       rb->RedBits = 5;
 120       rb->GreenBits = 6;
 121       rb->BlueBits = 5;
 122       irb->texformat = &_mesa_texformat_rgb565;
 123       cpp = 2;
 124       break;
 125    case GL_RGB:
 126    case GL_RGB8:
 127    case GL_RGB10:
 128    case GL_RGB12:
 129    case GL_RGB16:
 130       rb->_ActualFormat = GL_RGB8;
 131       rb->DataType = GL_UNSIGNED_BYTE;
 132       rb->RedBits = 8;
 133       rb->GreenBits = 8;
 134       rb->BlueBits = 8;
 135       rb->AlphaBits = 0;
 136       irb->texformat = &_mesa_texformat_argb8888; /* XXX: Need xrgb8888 */
 137       cpp = 4;
 138       break;
 139    case GL_RGBA:
 140    case GL_RGBA2:
 141    case GL_RGBA4:
 142    case GL_RGB5_A1:
 143    case GL_RGBA8:
 144    case GL_RGB10_A2:
 145    case GL_RGBA12:
 146    case GL_RGBA16:
 147       rb->_ActualFormat = GL_RGBA8;
 148       rb->DataType = GL_UNSIGNED_BYTE;
 149       rb->RedBits = 8;
 150       rb->GreenBits = 8;
 151       rb->BlueBits = 8;
 152       rb->AlphaBits = 8;
 153       irb->texformat = &_mesa_texformat_argb8888;
 154       cpp = 4;
 155       break;
 156    case GL_STENCIL_INDEX:
 157    case GL_STENCIL_INDEX1_EXT:
 158    case GL_STENCIL_INDEX4_EXT:
 159    case GL_STENCIL_INDEX8_EXT:
 160    case GL_STENCIL_INDEX16_EXT:
 161       /* alloc a depth+stencil buffer */
 162       rb->_ActualFormat = GL_DEPTH24_STENCIL8_EXT;
 163       rb->DataType = GL_UNSIGNED_INT_24_8_EXT;
 164       rb->StencilBits = 8;
 165       cpp = 4;
 166       irb->texformat = &_mesa_texformat_s8_z24;
 167       break;
 168    case GL_DEPTH_COMPONENT16:
 169       rb->_ActualFormat = GL_DEPTH_COMPONENT16;
 170       rb->DataType = GL_UNSIGNED_SHORT;
 171       rb->DepthBits = 16;
 172       cpp = 2;
 173       irb->texformat = &_mesa_texformat_z16;
 174       break;
 175    case GL_DEPTH_COMPONENT:
 176    case GL_DEPTH_COMPONENT24:
 177    case GL_DEPTH_COMPONENT32:
 178       rb->_ActualFormat = GL_DEPTH24_STENCIL8_EXT;
 179       rb->DataType = GL_UNSIGNED_INT_24_8_EXT;
 180       rb->DepthBits = 24;
 181       cpp = 4;
 182       irb->texformat = &_mesa_texformat_s8_z24;
 183       break;
 184    case GL_DEPTH_STENCIL_EXT:
 185    case GL_DEPTH24_STENCIL8_EXT:
 186       rb->_ActualFormat = GL_DEPTH24_STENCIL8_EXT;
 187       rb->DataType = GL_UNSIGNED_INT_24_8_EXT;
 188       rb->DepthBits = 24;
 189       rb->StencilBits = 8;
 190       cpp = 4;
 191       irb->texformat = &_mesa_texformat_s8_z24;
 192       break;
 193    default:
 194       _mesa_problem(ctx,
 195                     "Unexpected format in intel_alloc_renderbuffer_storage");
 196       return GL_FALSE;
 197    }
 198
 199    intelFlush(ctx);
 200
 201    /* free old region */
 202    if (irb->region) {
 203       intel_region_release(&irb->region);
 204    }
 205
 206    /* allocate new memory region/renderbuffer */
 207    if (softwareBuffer) {
 208       return _mesa_soft_renderbuffer_storage(ctx, rb, internalFormat,
 209                                              width, height);
 210    }
 211    else {
 212       /* Choose a pitch to match hardware requirements:
 213        */
 214       GLuint pitch = ((cpp * width + 63) & ~63) / cpp;
 215
 216       /* alloc hardware renderbuffer */
 217       DBG("Allocating %d x %d Intel RBO (pitch %d)\n", width,
 218           height, pitch);
 219
 220       irb->region = intel_region_alloc(intel, cpp, width, height, pitch,
 221                                        GL_TRUE);
 222       if (!irb->region)
 223          return GL_FALSE;       /* out of memory? */
 224
 225       ASSERT(irb->region->buffer);
 226
 227       rb->Width = width;
 228       rb->Height = height;
 229
 230       return GL_TRUE;
 231    }
 232 }
 233
 234
 235 /**
 236  * Called for each hardware renderbuffer when a _window_ is resized.
 237  * Just update fields.
 238  * Not used for user-created renderbuffers!
 239  */
 240 static GLboolean
 241 intel_alloc_window_storage(GLcontext * ctx, struct gl_renderbuffer *rb,
 242                            GLenum internalFormat, GLuint width, GLuint height)
 243 {
 244    ASSERT(rb->Name == 0);
 245    rb->Width = width;
 246    rb->Height = height;
 247    rb->_ActualFormat = internalFormat;
 248
 249    return GL_TRUE;
 250 }
 251
 252
 253 static void
 254 intel_resize_buffers(GLcontext *ctx, struct gl_framebuffer *fb,
 255                      GLuint width, GLuint height)
 256 {
 257    struct intel_framebuffer *intel_fb = (struct intel_framebuffer*)fb;
 258    int i;
 259
 260    _mesa_resize_framebuffer(ctx, fb, width, height);
 261
 262    fb->Initialized = GL_TRUE; /* XXX remove someday */
 263
 264    if (fb->Name != 0) {
 265       return;
 266    }
 267
 268    /* Make sure all window system renderbuffers are up to date */
 269    for (i = 0; i < 2; i++) {
 270       struct gl_renderbuffer *rb = &intel_fb->color_rb[i]->Base;
 271
 272       /* only resize if size is changing */
 273       if (rb && (rb->Width != width || rb->Height != height)) {
 274          rb->AllocStorage(ctx, rb, rb->InternalFormat, width, height);
 275       }
 276    }
 277 }
 278
 279
 280 /** Dummy function for gl_renderbuffer::AllocStorage() */
 281 static GLboolean
 282 intel_nop_alloc_storage(GLcontext * ctx, struct gl_renderbuffer *rb,
 283                         GLenum internalFormat, GLuint width, GLuint height)
 284 {
 285    _mesa_problem(ctx, "intel_op_alloc_storage should never be called.");
 286    return GL_FALSE;
 287 }
 288
 289
 290 void
 291 intel_renderbuffer_set_region(struct intel_renderbuffer *rb,
 292                               struct intel_region *region)
 293 {
 294    struct intel_region *old;
 295
 296    old = rb->region;
 297    rb->region = NULL;
 298    intel_region_reference(&rb->region, region);
 299    intel_region_release(&old);
 300 }
 301
 302
 303 /**
 304  * Create a new intel_renderbuffer which corresponds to an on-screen window,
 305  * not a user-created renderbuffer.
 306  */
 307 struct intel_renderbuffer *
 308 intel_create_renderbuffer(GLenum intFormat)
 309 {
 310    GET_CURRENT_CONTEXT(ctx);
 311
 312    struct intel_renderbuffer *irb;
 313    const GLuint name = 0;
 314
 315    irb = CALLOC_STRUCT(intel_renderbuffer);
 316    if (!irb) {
 317       _mesa_error(ctx, GL_OUT_OF_MEMORY, "creating renderbuffer");
 318       return NULL;
 319    }
 320
 321    _mesa_init_renderbuffer(&irb->Base, name);
 322    irb->Base.ClassID = INTEL_RB_CLASS;
 323
 324    switch (intFormat) {
 325    case GL_RGB5:
 326       irb->Base._ActualFormat = GL_RGB5;
 327       irb->Base._BaseFormat = GL_RGBA;
 328       irb->Base.RedBits = 5;
 329       irb->Base.GreenBits = 6;
 330       irb->Base.BlueBits = 5;
 331       irb->Base.DataType = GL_UNSIGNED_BYTE;
 332       irb->texformat = &_mesa_texformat_rgb565;
 333       break;
 334    case GL_RGB8:
 335       irb->Base._ActualFormat = GL_RGB8;
 336       irb->Base._BaseFormat = GL_RGB;
 337       irb->Base.RedBits = 8;
 338       irb->Base.GreenBits = 8;
 339       irb->Base.BlueBits = 8;
 340       irb->Base.AlphaBits = 0;
 341       irb->Base.DataType = GL_UNSIGNED_BYTE;
 342       irb->texformat = &_mesa_texformat_argb8888; /* XXX: Need xrgb8888 */
 343       break;
 344    case GL_RGBA8:
 345       irb->Base._ActualFormat = GL_RGBA8;
 346       irb->Base._BaseFormat = GL_RGBA;
 347       irb->Base.RedBits = 8;
 348       irb->Base.GreenBits = 8;
 349       irb->Base.BlueBits = 8;
 350       irb->Base.AlphaBits = 8;
 351       irb->Base.DataType = GL_UNSIGNED_BYTE;
 352       irb->texformat = &_mesa_texformat_argb8888;
 353       break;
 354    case GL_STENCIL_INDEX8_EXT:
 355       irb->Base._ActualFormat = GL_STENCIL_INDEX8_EXT;
 356       irb->Base._BaseFormat = GL_STENCIL_INDEX;
 357       irb->Base.StencilBits = 8;
 358       irb->Base.DataType = GL_UNSIGNED_BYTE;
 359       irb->texformat = &_mesa_texformat_s8_z24;
 360       break;
 361    case GL_DEPTH_COMPONENT16:
 362       irb->Base._ActualFormat = GL_DEPTH_COMPONENT16;
 363       irb->Base._BaseFormat = GL_DEPTH_COMPONENT;
 364       irb->Base.DepthBits = 16;
 365       irb->Base.DataType = GL_UNSIGNED_SHORT;
 366       irb->texformat = &_mesa_texformat_z16;
 367       break;
 368    case GL_DEPTH_COMPONENT24:
 369       irb->Base._ActualFormat = GL_DEPTH24_STENCIL8_EXT;
 370       irb->Base._BaseFormat = GL_DEPTH_COMPONENT;
 371       irb->Base.DepthBits = 24;
 372       irb->Base.DataType = GL_UNSIGNED_INT;
 373       irb->texformat = &_mesa_texformat_s8_z24;
 374       break;
 375    case GL_DEPTH24_STENCIL8_EXT:
 376       irb->Base._ActualFormat = GL_DEPTH24_STENCIL8_EXT;
 377       irb->Base._BaseFormat = GL_DEPTH_STENCIL_EXT;
 378       irb->Base.DepthBits = 24;
 379       irb->Base.StencilBits = 8;
 380       irb->Base.DataType = GL_UNSIGNED_INT_24_8_EXT;
 381       irb->texformat = &_mesa_texformat_s8_z24;
 382       break;
 383    default:
 384       _mesa_problem(NULL,
 385                     "Unexpected intFormat in intel_create_renderbuffer");
 386       return NULL;
 387    }
 388
 389    irb->Base.InternalFormat = intFormat;
 390
 391    /* intel-specific methods */
 392    irb->Base.Delete = intel_delete_renderbuffer;
 393    irb->Base.AllocStorage = intel_alloc_window_storage;
 394    irb->Base.GetPointer = intel_get_pointer;
 395
 396    return irb;
 397 }
 398
 399
 400 /**
 401  * Create a new renderbuffer object.
 402  * Typically called via glBindRenderbufferEXT().
 403  */
 404 static struct gl_renderbuffer *
 405 intel_new_renderbuffer(GLcontext * ctx, GLuint name)
 406 {
 407    /*struct intel_context *intel = intel_context(ctx); */
 408    struct intel_renderbuffer *irb;
 409
 410    irb = CALLOC_STRUCT(intel_renderbuffer);
 411    if (!irb) {
 412       _mesa_error(ctx, GL_OUT_OF_MEMORY, "creating renderbuffer");
 413       return NULL;
 414    }
 415
 416    _mesa_init_renderbuffer(&irb->Base, name);
 417    irb->Base.ClassID = INTEL_RB_CLASS;
 418
 419    /* intel-specific methods */
 420    irb->Base.Delete = intel_delete_renderbuffer;
 421    irb->Base.AllocStorage = intel_alloc_renderbuffer_storage;
 422    irb->Base.GetPointer = intel_get_pointer;
 423    /* span routines set in alloc_storage function */
 424
 425    return &irb->Base;
 426 }
 427
 428
 429 /**
 430  * Called via glBindFramebufferEXT().
 431  */
 432 static void
 433 intel_bind_framebuffer(GLcontext * ctx, GLenum target,
 434                        struct gl_framebuffer *fb, struct gl_framebuffer *fbread)
 435 {
 436    if (target == GL_FRAMEBUFFER_EXT || target == GL_DRAW_FRAMEBUFFER_EXT) {
 437       intel_draw_buffer(ctx, fb);
 438    }
 439    else {
 440       /* don't need to do anything if target == GL_READ_FRAMEBUFFER_EXT */
 441    }
 442 }
 443
 444
 445 /**
 446  * Called via glFramebufferRenderbufferEXT().
 447  */
 448 static void
 449 intel_framebuffer_renderbuffer(GLcontext * ctx,
 450                                struct gl_framebuffer *fb,
 451                                GLenum attachment, struct gl_renderbuffer *rb)
 452 {
 453    DBG("Intel FramebufferRenderbuffer %u %u\n", fb->Name, rb ? rb->Name : 0);
 454
 455    intelFlush(ctx);
 456
 457    _mesa_framebuffer_renderbuffer(ctx, fb, attachment, rb);
 458    intel_draw_buffer(ctx, fb);
 459 }
 460
 461
 462 static GLboolean
 463 intel_update_wrapper(GLcontext *ctx, struct intel_renderbuffer *irb,
 464                      struct gl_texture_image *texImage)
 465 {
 466    irb->texformat = texImage->TexFormat;
 467
 468    if (texImage->TexFormat == &_mesa_texformat_argb8888) {
 469       irb->Base._ActualFormat = GL_RGBA8;
 470       irb->Base._BaseFormat = GL_RGBA;
 471       irb->Base.DataType = GL_UNSIGNED_BYTE;
 472       DBG("Render to RGBA8 texture OK\n");
 473    }
 474    else if (texImage->TexFormat == &_mesa_texformat_rgb565) {
 475       irb->Base._ActualFormat = GL_RGB5;
 476       irb->Base._BaseFormat = GL_RGB;
 477       irb->Base.DataType = GL_UNSIGNED_BYTE;
 478       DBG("Render to RGB5 texture OK\n");
 479    }
 480    else if (texImage->TexFormat == &_mesa_texformat_argb1555) {
 481       irb->Base._ActualFormat = GL_RGB5_A1;
 482       irb->Base._BaseFormat = GL_RGBA;
 483       irb->Base.DataType = GL_UNSIGNED_BYTE;
 484       DBG("Render to ARGB1555 texture OK\n");
 485    }
 486    else if (texImage->TexFormat == &_mesa_texformat_argb4444) {
 487       irb->Base._ActualFormat = GL_RGBA4;
 488       irb->Base._BaseFormat = GL_RGBA;
 489       irb->Base.DataType = GL_UNSIGNED_BYTE;
 490       DBG("Render to ARGB4444 texture OK\n");
 491    }
 492    else if (texImage->TexFormat == &_mesa_texformat_z16) {
 493       irb->Base._ActualFormat = GL_DEPTH_COMPONENT16;
 494       irb->Base._BaseFormat = GL_DEPTH_COMPONENT;
 495       irb->Base.DataType = GL_UNSIGNED_SHORT;
 496       DBG("Render to DEPTH16 texture OK\n");
 497    }
 498    else if (texImage->TexFormat == &_mesa_texformat_s8_z24) {
 499       irb->Base._ActualFormat = GL_DEPTH24_STENCIL8_EXT;
 500       irb->Base._BaseFormat = GL_DEPTH_STENCIL_EXT;
 501       irb->Base.DataType = GL_UNSIGNED_INT_24_8_EXT;
 502       DBG("Render to DEPTH_STENCIL texture OK\n");
 503    }
 504    else {
 505       DBG("Render to texture BAD FORMAT %d\n",
 506           texImage->TexFormat->MesaFormat);
 507       return GL_FALSE;
 508    }
 509
 510    irb->Base.InternalFormat = irb->Base._ActualFormat;
 511    irb->Base.Width = texImage->Width;
 512    irb->Base.Height = texImage->Height;
 513    irb->Base.RedBits = texImage->TexFormat->RedBits;
 514    irb->Base.GreenBits = texImage->TexFormat->GreenBits;
 515    irb->Base.BlueBits = texImage->TexFormat->BlueBits;
 516    irb->Base.AlphaBits = texImage->TexFormat->AlphaBits;
 517    irb->Base.DepthBits = texImage->TexFormat->DepthBits;
 518
 519    irb->Base.Delete = intel_delete_renderbuffer;
 520    irb->Base.AllocStorage = intel_nop_alloc_storage;
 521
 522    return GL_TRUE;
 523 }
 524
 525
 526 /**
 527  * When glFramebufferTexture[123]D is called this function sets up the
 528  * gl_renderbuffer wrapper around the texture image.
 529  * This will have the region info needed for hardware rendering.
 530  */
 531 static struct intel_renderbuffer *
 532 intel_wrap_texture(GLcontext * ctx, struct gl_texture_image *texImage)
 533 {
 534    const GLuint name = ~0;   /* not significant, but distinct for debugging */
 535    struct intel_renderbuffer *irb;
 536
 537    /* make an intel_renderbuffer to wrap the texture image */
 538    irb = CALLOC_STRUCT(intel_renderbuffer);
 539    if (!irb) {
 540       _mesa_error(ctx, GL_OUT_OF_MEMORY, "glFramebufferTexture");
 541       return NULL;
 542    }
 543
 544    _mesa_init_renderbuffer(&irb->Base, name);
 545    irb->Base.ClassID = INTEL_RB_CLASS;
 546
 547    if (!intel_update_wrapper(ctx, irb, texImage)) {
 548       _mesa_free(irb);
 549       return NULL;
 550    }
 551
 552    return irb;
 553 }
 554
 555
 556 /**
 557  * Called by glFramebufferTexture[123]DEXT() (and other places) to
 558  * prepare for rendering into texture memory.  This might be called
 559  * many times to choose different texture levels, cube faces, etc
 560  * before intel_finish_render_texture() is ever called.
 561  */
 562 static void
 563 intel_render_texture(GLcontext * ctx,
 564                      struct gl_framebuffer *fb,
 565                      struct gl_renderbuffer_attachment *att)
 566 {
 567    struct gl_texture_image *newImage
 568       = att->Texture->Image[att->CubeMapFace][att->TextureLevel];
 569    struct intel_renderbuffer *irb = intel_renderbuffer(att->Renderbuffer);
 570    struct intel_texture_image *intel_image;
 571    GLuint imageOffset;
 572
 573    (void) fb;
 574
 575    ASSERT(newImage);
 576
 577    if (newImage->Border != 0) {
 578       /* Fallback on drawing to a texture with a border, which won't have a
 579        * miptree.
 580        */
 581       _mesa_reference_renderbuffer(&att->Renderbuffer, NULL);
 582       _mesa_render_texture(ctx, fb, att);
 583       return;
 584    }
 585    else if (!irb) {
 586       irb = intel_wrap_texture(ctx, newImage);
 587       if (irb) {
 588          /* bind the wrapper to the attachment point */
 589          _mesa_reference_renderbuffer(&att->Renderbuffer, &irb->Base);
 590       }
 591       else {
 592          /* fallback to software rendering */
 593          _mesa_render_texture(ctx, fb, att);
 594          return;
 595       }
 596    }
 597
 598    if (!intel_update_wrapper(ctx, irb, newImage)) {
 599        _mesa_reference_renderbuffer(&att->Renderbuffer, NULL);
 600        _mesa_render_texture(ctx, fb, att);
 601        return;
 602    }
 603
 604    DBG("Begin render texture tid %x tex=%u w=%d h=%d refcount=%d\n",
 605        _glthread_GetID(),
 606        att->Texture->Name, newImage->Width, newImage->Height,
 607        irb->Base.RefCount);
 608
 609    /* point the renderbufer's region to the texture image region */
 610    intel_image = intel_texture_image(newImage);
 611    if (irb->region != intel_image->mt->region) {
 612       if (irb->region)
 613          intel_region_release(&irb->region);
 614       intel_region_reference(&irb->region, intel_image->mt->region);
 615    }
 616
 617    /* compute offset of the particular 2D image within the texture region */
 618    imageOffset = intel_miptree_image_offset(intel_image->mt,
 619                                             att->CubeMapFace,
 620                                             att->TextureLevel);
 621
 622    if (att->Texture->Target == GL_TEXTURE_3D) {
 623       const GLuint *offsets = intel_miptree_depth_offsets(intel_image->mt,
 624                                                           att->TextureLevel);
 625       imageOffset += offsets[att->Zoffset];
 626    }
 627
 628    /* store that offset in the region */
 629    intel_image->mt->region->draw_offset = imageOffset;
 630
 631    /* update drawing region, etc */
 632    intel_draw_buffer(ctx, fb);
 633 }
 634
 635
 636 /**
 637  * Called by Mesa when rendering to a texture is done.
 638  */
 639 static void
 640 intel_finish_render_texture(GLcontext * ctx,
 641                             struct gl_renderbuffer_attachment *att)
 642 {
 643    /* no-op
 644     * Previously we released the renderbuffer's intel_region but
 645     * that's not necessary and actually caused problems when trying
 646     * to do a glRead/CopyPixels from the renderbuffer later.
 647     * The region will be released later if the texture is replaced
 648     * or the renderbuffer deleted.
 649     *
 650     * The intention of this driver hook is more of a "done rendering
 651     * to texture, please re-twiddle/etc if necessary".
 652     */
 653 }
 654
 655
 656 /**
 657  * Do additional "completeness" testing of a framebuffer object.
 658  */
 659 static void
 660 intel_validate_framebuffer(GLcontext *ctx, struct gl_framebuffer *fb)
 661 {
 662    const struct intel_renderbuffer *depthRb =
 663       intel_get_renderbuffer(fb, BUFFER_DEPTH);
 664    const struct intel_renderbuffer *stencilRb =
 665       intel_get_renderbuffer(fb, BUFFER_STENCIL);
 666    int i;
 667
 668    if (stencilRb && stencilRb != depthRb) {
 669       /* we only support combined depth/stencil buffers, not separate
 670        * stencil buffers.
 671        */
 672       fb->_Status = GL_FRAMEBUFFER_UNSUPPORTED_EXT;
 673    }
 674
 675    for (i = 0; i < ctx->Const.MaxDrawBuffers; i++) {
 676       struct gl_renderbuffer *rb = ctx->DrawBuffer->_ColorDrawBuffers[i];
 677       struct intel_renderbuffer *irb = intel_renderbuffer(rb);
 678
 679       if (rb == NULL)
 680          continue;
 681
 682       switch (irb->texformat->MesaFormat) {
 683       case MESA_FORMAT_ARGB8888:
 684       case MESA_FORMAT_RGB565:
 685       case MESA_FORMAT_ARGB1555:
 686       case MESA_FORMAT_ARGB4444:
 687          break;
 688       default:
 689          fb->_Status = GL_FRAMEBUFFER_UNSUPPORTED_EXT;
 690       }
 691    }
 692 }
 693
 694
 695 /**
 696  * Called from glBlitFramebuffer().
 697  * For now, we're doing an approximation with glCopyPixels().
 698  * XXX we need to bypass all the per-fragment operations, except scissor.
 699  */
 700 static void
 701 intel_blit_framebuffer(GLcontext *ctx,
 702                        GLint srcX0, GLint srcY0, GLint srcX1, GLint srcY1,
 703                        GLint dstX0, GLint dstY0, GLint dstX1, GLint dstY1,
 704                        GLbitfield mask, GLenum filter)
 705 {
 706    const GLfloat xZoomSave = ctx->Pixel.ZoomX;
 707    const GLfloat yZoomSave = ctx->Pixel.ZoomY;
 708    GLsizei width, height;
 709    GLfloat xFlip = 1.0F, yFlip = 1.0F;
 710
 711    if (srcX1 < srcX0) {
 712       GLint tmp = srcX1;
 713       srcX1 = srcX0;
 714       srcX0 = tmp;
 715       xFlip = -1.0F;
 716    }
 717
 718    if (srcY1 < srcY0) {
 719       GLint tmp = srcY1;
 720       srcY1 = srcY0;
 721       srcY0 = tmp;
 722       yFlip = -1.0F;
 723    }
 724
 725    width = srcX1 - srcX0;
 726    height = srcY1 - srcY0;
 727
 728    ctx->Pixel.ZoomX = xFlip * (dstX1 - dstX0) / (srcX1 - srcY0);
 729    ctx->Pixel.ZoomY = yFlip * (dstY1 - dstY0) / (srcY1 - srcY0);
 730
 731    if (ctx->Pixel.ZoomX < 0.0F) {
 732       dstX0 = MAX2(dstX0, dstX1);
 733    }
 734    else {
 735       dstX0 = MIN2(dstX0, dstX1);
 736    }
 737
 738    if (ctx->Pixel.ZoomY < 0.0F) {
 739       dstY0 = MAX2(dstY0, dstY1);
 740    }
 741    else {
 742       dstY0 = MIN2(dstY0, dstY1);
 743    }
 744
 745    if (mask & GL_COLOR_BUFFER_BIT) {
 746       ctx->Driver.CopyPixels(ctx, srcX0, srcY0, width, height,
 747                              dstX0, dstY0, GL_COLOR);
 748    }
 749    if (mask & GL_DEPTH_BUFFER_BIT) {
 750       ctx->Driver.CopyPixels(ctx, srcX0, srcY0, width, height,
 751                              dstX0, dstY0, GL_DEPTH);
 752    }
 753    if (mask & GL_STENCIL_BUFFER_BIT) {
 754       ctx->Driver.CopyPixels(ctx, srcX0, srcY0, width, height,
 755                              dstX0, dstY0, GL_STENCIL);
 756    }
 757
 758    ctx->Pixel.ZoomX = xZoomSave;
 759    ctx->Pixel.ZoomY = yZoomSave;
 760 }
 761
 762
 763 /**
 764  * Do one-time context initializations related to GL_EXT_framebuffer_object.
 765  * Hook in device driver functions.
 766  */
 767 void
 768 intel_fbo_init(struct intel_context *intel)
 769 {
 770    intel->ctx.Driver.NewFramebuffer = intel_new_framebuffer;
 771    intel->ctx.Driver.NewRenderbuffer = intel_new_renderbuffer;
 772    intel->ctx.Driver.BindFramebuffer = intel_bind_framebuffer;
 773    intel->ctx.Driver.FramebufferRenderbuffer = intel_framebuffer_renderbuffer;
 774    intel->ctx.Driver.RenderTexture = intel_render_texture;
 775    intel->ctx.Driver.FinishRenderTexture = intel_finish_render_texture;
 776    intel->ctx.Driver.ResizeBuffers = intel_resize_buffers;
 777    intel->ctx.Driver.ValidateFramebuffer = intel_validate_framebuffer;
 778    intel->ctx.Driver.BlitFramebuffer = intel_blit_framebuffer;
 779 }