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