src/mesa/state_tracker/st_cb_fbo.c

   1 /**************************************************************************
   2  *
   3  * Copyright 2007 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 /**
  30  * Framebuffer/renderbuffer functions.
  31  *
  32  * \author Brian Paul
  33  */
  34
  35
  36 #include "main/imports.h"
  37 #include "main/context.h"
  38 #include "main/fbobject.h"
  39 #include "main/framebuffer.h"
  40 #include "main/macros.h"
  41 #include "main/renderbuffer.h"
  42
  43 #include "pipe/p_context.h"
  44 #include "pipe/p_defines.h"
  45 #include "pipe/p_screen.h"
  46 #include "st_context.h"
  47 #include "st_cb_fbo.h"
  48 #include "st_format.h"
  49 #include "st_public.h"
  50 #include "st_texture.h"
  51 #include "st_manager.h"
  52
  53 #include "util/u_format.h"
  54 #include "util/u_rect.h"
  55 #include "util/u_inlines.h"
  56
  57
  58 /**
  59  * gl_renderbuffer::AllocStorage()
  60  * This is called to allocate the original drawing surface, and
  61  * during window resize.
  62  */
  63 static GLboolean
  64 st_renderbuffer_alloc_storage(GLcontext * ctx, struct gl_renderbuffer *rb,
  65                               GLenum internalFormat,
  66                               GLuint width, GLuint height)
  67 {
  68    struct pipe_screen *screen = ctx->st->pipe->screen;
  69    struct st_renderbuffer *strb = st_renderbuffer(rb);
  70    enum pipe_format format;
  71
  72    if (strb->format != PIPE_FORMAT_NONE)
  73       format = strb->format;
  74    else
  75       format = st_choose_renderbuffer_format(screen, internalFormat);
  76
  77    /* init renderbuffer fields */
  78    strb->Base.Width  = width;
  79    strb->Base.Height = height;
  80    strb->Base.Format = st_pipe_format_to_mesa_format(format);
  81    strb->Base.DataType = st_format_datatype(format);
  82
  83    strb->defined = GL_FALSE;  /* undefined contents now */
  84
  85    if (strb->software) {
  86       size_t size;
  87
  88       free(strb->data);
  89
  90       assert(strb->format != PIPE_FORMAT_NONE);
  91
  92       strb->stride = util_format_get_stride(strb->format, width);
  93       size = util_format_get_2d_size(strb->format, strb->stride, height);
  94
  95       strb->data = malloc(size);
  96
  97       return strb->data != NULL;
  98    }
  99    else {
 100       struct pipe_texture template;
 101       unsigned surface_usage;
 102
 103       /* Free the old surface and texture
 104        */
 105       pipe_surface_reference( &strb->surface, NULL );
 106       pipe_texture_reference( &strb->texture, NULL );
 107       pipe_sampler_view_reference(&strb->sampler_view, NULL);
 108
 109       /* Setup new texture template.
 110        */
 111       memset(&template, 0, sizeof(template));
 112       template.target = PIPE_TEXTURE_2D;
 113       template.format = format;
 114       template.width0 = width;
 115       template.height0 = height;
 116       template.depth0 = 1;
 117       template.last_level = 0;
 118       template.nr_samples = rb->NumSamples;
 119       if (util_format_is_depth_or_stencil(format)) {
 120          template.tex_usage = PIPE_TEXTURE_USAGE_DEPTH_STENCIL;
 121       }
 122       else {
 123          template.tex_usage = (PIPE_TEXTURE_USAGE_DISPLAY_TARGET |
 124                                PIPE_TEXTURE_USAGE_RENDER_TARGET);
 125       }
 126
 127       /* Probably need dedicated flags for surface usage too:
 128        */
 129       surface_usage = (PIPE_BUFFER_USAGE_GPU_READ |
 130                        PIPE_BUFFER_USAGE_GPU_WRITE);
 131 #if 0
 132                        PIPE_BUFFER_USAGE_CPU_READ |
 133                        PIPE_BUFFER_USAGE_CPU_WRITE);
 134 #endif
 135
 136       strb->texture = screen->texture_create(screen, &template);
 137
 138       if (!strb->texture)
 139          return FALSE;
 140
 141       strb->surface = screen->get_tex_surface(screen,
 142                                               strb->texture,
 143                                               0, 0, 0,
 144                                               surface_usage);
 145       if (strb->surface) {
 146          assert(strb->surface->texture);
 147          assert(strb->surface->format);
 148          assert(strb->surface->width == width);
 149          assert(strb->surface->height == height);
 150       }
 151
 152       return strb->surface != NULL;
 153    }
 154 }
 155
 156
 157 /**
 158  * gl_renderbuffer::Delete()
 159  */
 160 static void
 161 st_renderbuffer_delete(struct gl_renderbuffer *rb)
 162 {
 163    struct st_renderbuffer *strb = st_renderbuffer(rb);
 164    ASSERT(strb);
 165    pipe_surface_reference(&strb->surface, NULL);
 166    pipe_texture_reference(&strb->texture, NULL);
 167    pipe_sampler_view_reference(&strb->sampler_view, NULL);
 168    free(strb->data);
 169    free(strb);
 170 }
 171
 172
 173 /**
 174  * gl_renderbuffer::GetPointer()
 175  */
 176 static void *
 177 null_get_pointer(GLcontext * ctx, struct gl_renderbuffer *rb,
 178                  GLint x, GLint y)
 179 {
 180    /* By returning NULL we force all software rendering to go through
 181     * the span routines.
 182     */
 183 #if 0
 184    assert(0);  /* Should never get called with softpipe */
 185 #endif
 186    return NULL;
 187 }
 188
 189
 190 /**
 191  * Called via ctx->Driver.NewFramebuffer()
 192  */
 193 static struct gl_framebuffer *
 194 st_new_framebuffer(GLcontext *ctx, GLuint name)
 195 {
 196    /* XXX not sure we need to subclass gl_framebuffer for pipe */
 197    return _mesa_new_framebuffer(ctx, name);
 198 }
 199
 200
 201 /**
 202  * Called via ctx->Driver.NewRenderbuffer()
 203  */
 204 static struct gl_renderbuffer *
 205 st_new_renderbuffer(GLcontext *ctx, GLuint name)
 206 {
 207    struct st_renderbuffer *strb = ST_CALLOC_STRUCT(st_renderbuffer);
 208    if (strb) {
 209       _mesa_init_renderbuffer(&strb->Base, name);
 210       strb->Base.Delete = st_renderbuffer_delete;
 211       strb->Base.AllocStorage = st_renderbuffer_alloc_storage;
 212       strb->Base.GetPointer = null_get_pointer;
 213       strb->format = PIPE_FORMAT_NONE;
 214       return &strb->Base;
 215    }
 216    return NULL;
 217 }
 218
 219
 220 /**
 221  * Allocate a renderbuffer for a an on-screen window (not a user-created
 222  * renderbuffer).  The window system code determines the format.
 223  */
 224 struct gl_renderbuffer *
 225 st_new_renderbuffer_fb(enum pipe_format format, int samples, boolean sw)
 226 {
 227    struct st_renderbuffer *strb;
 228
 229    strb = ST_CALLOC_STRUCT(st_renderbuffer);
 230    if (!strb) {
 231       _mesa_error(NULL, GL_OUT_OF_MEMORY, "creating renderbuffer");
 232       return NULL;
 233    }
 234
 235    _mesa_init_renderbuffer(&strb->Base, 0);
 236    strb->Base.ClassID = 0x4242; /* just a unique value */
 237    strb->Base.NumSamples = samples;
 238    strb->Base.Format = st_pipe_format_to_mesa_format(format);
 239    strb->Base.DataType = st_format_datatype(format);
 240    strb->format = format;
 241    strb->software = sw;
 242
 243    switch (format) {
 244    case PIPE_FORMAT_B8G8R8A8_UNORM:
 245    case PIPE_FORMAT_A8R8G8B8_UNORM:
 246    case PIPE_FORMAT_B8G8R8X8_UNORM:
 247    case PIPE_FORMAT_X8R8G8B8_UNORM:
 248    case PIPE_FORMAT_B5G5R5A1_UNORM:
 249    case PIPE_FORMAT_B4G4R4A4_UNORM:
 250    case PIPE_FORMAT_B5G6R5_UNORM:
 251       strb->Base.InternalFormat = GL_RGBA;
 252       break;
 253    case PIPE_FORMAT_Z16_UNORM:
 254       strb->Base.InternalFormat = GL_DEPTH_COMPONENT16;
 255       break;
 256    case PIPE_FORMAT_Z32_UNORM:
 257       strb->Base.InternalFormat = GL_DEPTH_COMPONENT32;
 258       break;
 259    case PIPE_FORMAT_Z24S8_UNORM:
 260    case PIPE_FORMAT_S8Z24_UNORM:
 261    case PIPE_FORMAT_Z24X8_UNORM:
 262    case PIPE_FORMAT_X8Z24_UNORM:
 263       strb->Base.InternalFormat = GL_DEPTH24_STENCIL8_EXT;
 264       break;
 265    case PIPE_FORMAT_S8_UNORM:
 266       strb->Base.InternalFormat = GL_STENCIL_INDEX8_EXT;
 267       break;
 268    case PIPE_FORMAT_R16G16B16A16_SNORM:
 269       strb->Base.InternalFormat = GL_RGBA16;
 270       break;
 271    default:
 272       _mesa_problem(NULL,
 273                     "Unexpected format in st_new_renderbuffer_fb");
 274       free(strb);
 275       return NULL;
 276    }
 277
 278    /* st-specific methods */
 279    strb->Base.Delete = st_renderbuffer_delete;
 280    strb->Base.AllocStorage = st_renderbuffer_alloc_storage;
 281    strb->Base.GetPointer = null_get_pointer;
 282
 283    /* surface is allocated in st_renderbuffer_alloc_storage() */
 284    strb->surface = NULL;
 285
 286    return &strb->Base;
 287 }
 288
 289
 290
 291
 292 /**
 293  * Called via ctx->Driver.BindFramebufferEXT().
 294  */
 295 static void
 296 st_bind_framebuffer(GLcontext *ctx, GLenum target,
 297                     struct gl_framebuffer *fb, struct gl_framebuffer *fbread)
 298 {
 299
 300 }
 301
 302 /**
 303  * Called by ctx->Driver.FramebufferRenderbuffer
 304  */
 305 static void
 306 st_framebuffer_renderbuffer(GLcontext *ctx,
 307                             struct gl_framebuffer *fb,
 308                             GLenum attachment,
 309                             struct gl_renderbuffer *rb)
 310 {
 311    /* XXX no need for derivation? */
 312    _mesa_framebuffer_renderbuffer(ctx, fb, attachment, rb);
 313 }
 314
 315
 316 /**
 317  * Called by ctx->Driver.RenderTexture
 318  */
 319 static void
 320 st_render_texture(GLcontext *ctx,
 321                   struct gl_framebuffer *fb,
 322                   struct gl_renderbuffer_attachment *att)
 323 {
 324    struct pipe_screen *screen = ctx->st->pipe->screen;
 325    struct st_renderbuffer *strb;
 326    struct gl_renderbuffer *rb;
 327    struct pipe_texture *pt = st_get_texobj_texture(att->Texture);
 328    struct st_texture_object *stObj;
 329    const struct gl_texture_image *texImage;
 330    GLint pt_level;
 331
 332    /* When would this fail?  Perhaps assert? */
 333    if (!pt)
 334       return;
 335
 336    /* The first gallium texture level = Mesa BaseLevel */
 337    pt_level = MAX2(0, (GLint) att->TextureLevel - att->Texture->BaseLevel);
 338    texImage = att->Texture->Image[att->CubeMapFace][pt_level];
 339
 340    /* create new renderbuffer which wraps the texture image */
 341    rb = st_new_renderbuffer(ctx, 0);
 342    if (!rb) {
 343       _mesa_error(ctx, GL_OUT_OF_MEMORY, "glFramebufferTexture()");
 344       return;
 345    }
 346
 347    _mesa_reference_renderbuffer(&att->Renderbuffer, rb);
 348    assert(rb->RefCount == 1);
 349    rb->AllocStorage = NULL; /* should not get called */
 350    strb = st_renderbuffer(rb);
 351
 352    assert(strb->Base.RefCount > 0);
 353
 354    /* get the texture for the texture object */
 355    stObj = st_texture_object(att->Texture);
 356
 357    /* point renderbuffer at texobject */
 358    strb->rtt = stObj;
 359    strb->rtt_level = pt_level;
 360    strb->rtt_face = att->CubeMapFace;
 361    strb->rtt_slice = att->Zoffset;
 362
 363    rb->Width = texImage->Width2;
 364    rb->Height = texImage->Height2;
 365    rb->_BaseFormat = texImage->_BaseFormat;
 366    /*printf("***** render to texture level %d: %d x %d\n", att->TextureLevel, rb->Width, rb->Height);*/
 367
 368    /*printf("***** pipe texture %d x %d\n", pt->width0, pt->height0);*/
 369
 370    pipe_texture_reference( &strb->texture, pt );
 371
 372    pipe_surface_reference(&strb->surface, NULL);
 373
 374    pipe_sampler_view_reference(&strb->sampler_view, st_get_stobj_sampler_view(stObj));
 375
 376    assert(strb->rtt_level <= strb->texture->last_level);
 377
 378    /* new surface for rendering into the texture */
 379    strb->surface = screen->get_tex_surface(screen,
 380                                            strb->texture,
 381                                            strb->rtt_face,
 382                                            strb->rtt_level,
 383                                            strb->rtt_slice,
 384                                            PIPE_BUFFER_USAGE_GPU_READ |
 385                                            PIPE_BUFFER_USAGE_GPU_WRITE);
 386
 387    strb->format = pt->format;
 388
 389    strb->Base.Format = st_pipe_format_to_mesa_format(pt->format);
 390    strb->Base.DataType = st_format_datatype(pt->format);
 391
 392    /*
 393    printf("RENDER TO TEXTURE obj=%p pt=%p surf=%p  %d x %d\n",
 394           att->Texture, pt, strb->surface, rb->Width, rb->Height);
 395    */
 396
 397    /* Invalidate buffer state so that the pipe's framebuffer state
 398     * gets updated.
 399     * That's where the new renderbuffer (which we just created) gets
 400     * passed to the pipe as a (color/depth) render target.
 401     */
 402    st_invalidate_state(ctx, _NEW_BUFFERS);
 403 }
 404
 405
 406 /**
 407  * Called via ctx->Driver.FinishRenderTexture.
 408  */
 409 static void
 410 st_finish_render_texture(GLcontext *ctx,
 411                          struct gl_renderbuffer_attachment *att)
 412 {
 413    struct st_renderbuffer *strb = st_renderbuffer(att->Renderbuffer);
 414
 415    if (!strb)
 416       return;
 417
 418    st_flush( ctx->st, PIPE_FLUSH_RENDER_CACHE, NULL );
 419
 420    strb->rtt = NULL;
 421
 422    /*
 423    printf("FINISH RENDER TO TEXTURE surf=%p\n", strb->surface);
 424    */
 425
 426    /* restore previous framebuffer state */
 427    st_invalidate_state(ctx, _NEW_BUFFERS);
 428 }
 429
 430
 431 /**
 432  * Validate a renderbuffer attachment for a particular usage.
 433  */
 434
 435 static GLboolean
 436 st_validate_attachment(struct pipe_screen *screen,
 437                        const struct gl_renderbuffer_attachment *att,
 438                        GLuint usage)
 439 {
 440    const struct st_texture_object *stObj =
 441       st_texture_object(att->Texture);
 442
 443    /**
 444     * Only validate texture attachments for now, since
 445     * st_renderbuffer_alloc_storage makes sure that
 446     * the format is supported.
 447     */
 448
 449    if (att->Type != GL_TEXTURE)
 450       return GL_TRUE;
 451
 452    if (!stObj)
 453       return GL_FALSE;
 454
 455    return screen->is_format_supported(screen, stObj->pt->format,
 456                                       PIPE_TEXTURE_2D,
 457                                       usage, 0);
 458 }
 459
 460 /**
 461  * Check that the framebuffer configuration is valid in terms of what
 462  * the driver can support.
 463  *
 464  * For Gallium we only supports combined Z+stencil, not separate buffers.
 465  */
 466 static void
 467 st_validate_framebuffer(GLcontext *ctx, struct gl_framebuffer *fb)
 468 {
 469    struct pipe_screen *screen = ctx->st->pipe->screen;
 470    const struct gl_renderbuffer *depthRb =
 471       fb->Attachment[BUFFER_DEPTH].Renderbuffer;
 472    const struct gl_renderbuffer *stencilRb =
 473       fb->Attachment[BUFFER_STENCIL].Renderbuffer;
 474    GLuint i;
 475
 476    if (stencilRb && depthRb && stencilRb != depthRb) {
 477       fb->_Status = GL_FRAMEBUFFER_UNSUPPORTED_EXT;
 478       return;
 479    }
 480
 481    if (!st_validate_attachment(screen,
 482                                &fb->Attachment[BUFFER_DEPTH],
 483                                PIPE_TEXTURE_USAGE_DEPTH_STENCIL)) {
 484       fb->_Status = GL_FRAMEBUFFER_UNSUPPORTED_EXT;
 485       return;
 486    }
 487    if (!st_validate_attachment(screen,
 488                                &fb->Attachment[BUFFER_STENCIL],
 489                                PIPE_TEXTURE_USAGE_DEPTH_STENCIL)) {
 490       fb->_Status = GL_FRAMEBUFFER_UNSUPPORTED_EXT;
 491       return;
 492    }
 493    for (i = 0; i < ctx->Const.MaxColorAttachments; i++) {
 494       if (!st_validate_attachment(screen,
 495                                   &fb->Attachment[BUFFER_COLOR0 + i],
 496                                   PIPE_TEXTURE_USAGE_RENDER_TARGET)) {
 497          fb->_Status = GL_FRAMEBUFFER_UNSUPPORTED_EXT;
 498          return;
 499       }
 500    }
 501 }
 502
 503
 504 /**
 505  * Copy back color buffer to front color buffer.
 506  */
 507 static void
 508 copy_back_to_front(struct st_context *st,
 509                    struct gl_framebuffer *fb,
 510                    gl_buffer_index frontIndex,
 511                    gl_buffer_index backIndex)
 512
 513 {
 514    struct st_framebuffer *stfb = (struct st_framebuffer *) fb;
 515    struct pipe_surface *surf_front, *surf_back;
 516
 517    (void) st_get_framebuffer_surface(stfb, frontIndex, &surf_front);
 518    (void) st_get_framebuffer_surface(stfb, backIndex, &surf_back);
 519
 520    if (surf_front && surf_back) {
 521       if (st->pipe->surface_copy) {
 522          st->pipe->surface_copy(st->pipe,
 523                                 surf_front, 0, 0,  /* dest */
 524                                 surf_back, 0, 0,   /* src */
 525                                 fb->Width, fb->Height);
 526       } else {
 527          util_surface_copy(st->pipe, FALSE,
 528                            surf_front, 0, 0,
 529                            surf_back, 0, 0,
 530                            fb->Width, fb->Height);
 531       }
 532    }
 533 }
 534
 535
 536 /**
 537  * Check if we're drawing into, or read from, a front color buffer.  If the
 538  * front buffer is missing, create it now.
 539  *
 540  * The back color buffer must exist since we'll use its format/samples info
 541  * for creating the front buffer.
 542  *
 543  * \param frontIndex  either BUFFER_FRONT_LEFT or BUFFER_FRONT_RIGHT
 544  * \param backIndex  either BUFFER_BACK_LEFT or BUFFER_BACK_RIGHT
 545  */
 546 static void
 547 check_create_front_buffer(GLcontext *ctx, struct gl_framebuffer *fb,
 548                           gl_buffer_index frontIndex,
 549                           gl_buffer_index backIndex)
 550 {
 551    if (fb->Attachment[frontIndex].Renderbuffer == NULL) {
 552       GLboolean create = GL_FALSE;
 553
 554       /* check if drawing to or reading from front buffer */
 555       if (fb->_ColorReadBufferIndex == frontIndex) {
 556          create = GL_TRUE;
 557       }
 558       else {
 559          GLuint b;
 560          for (b = 0; b < fb->_NumColorDrawBuffers; b++) {
 561             if (fb->_ColorDrawBufferIndexes[b] == frontIndex) {
 562                create = GL_TRUE;
 563                break;
 564             }
 565          }
 566       }
 567
 568       if (create) {
 569          struct st_renderbuffer *back;
 570          struct gl_renderbuffer *front;
 571          enum pipe_format colorFormat;
 572          uint samples;
 573
 574          if (0)
 575             _mesa_debug(ctx, "Allocate new front buffer\n");
 576
 577          /* get back renderbuffer info */
 578          back = st_renderbuffer(fb->Attachment[backIndex].Renderbuffer);
 579          colorFormat = back->format;
 580          samples = back->Base.NumSamples;
 581
 582          /* create front renderbuffer */
 583          front = st_new_renderbuffer_fb(colorFormat, samples, FALSE);
 584          _mesa_add_renderbuffer(fb, frontIndex, front);
 585
 586          /* alloc texture/surface for new front buffer */
 587          front->AllocStorage(ctx, front, front->InternalFormat,
 588                              fb->Width, fb->Height);
 589
 590          /* initialize the front color buffer contents by copying
 591           * the back buffer.
 592           */
 593          copy_back_to_front(ctx->st, fb, frontIndex, backIndex);
 594       }
 595    }
 596 }
 597
 598
 599 /**
 600  * If front left/right color buffers are missing, create them now.
 601  */
 602 static void
 603 check_create_front_buffers(GLcontext *ctx, struct gl_framebuffer *fb)
 604 {
 605    /* check if we need to create the front left buffer now */
 606    check_create_front_buffer(ctx, fb, BUFFER_FRONT_LEFT, BUFFER_BACK_LEFT);
 607
 608    if (fb->Visual.stereoMode) {
 609       check_create_front_buffer(ctx, fb, BUFFER_FRONT_RIGHT, BUFFER_BACK_RIGHT);
 610    }
 611
 612    st_invalidate_state(ctx, _NEW_BUFFERS);
 613 }
 614
 615
 616 /**
 617  * Called via glDrawBuffer.
 618  */
 619 static void
 620 st_DrawBuffers(GLcontext *ctx, GLsizei count, const GLenum *buffers)
 621 {
 622    GLframebuffer *fb = ctx->DrawBuffer;
 623    GLuint i;
 624
 625    (void) count;
 626    (void) buffers;
 627
 628    /* add the renderbuffers on demand */
 629    for (i = 0; i < fb->_NumColorDrawBuffers; i++) {
 630       gl_buffer_index idx = fb->_ColorDrawBufferIndexes[i];
 631       st_manager_add_color_renderbuffer(ctx->st, fb, idx);
 632    }
 633
 634    check_create_front_buffers(ctx, ctx->DrawBuffer);
 635 }
 636
 637
 638 /**
 639  * Called via glReadBuffer.
 640  */
 641 static void
 642 st_ReadBuffer(GLcontext *ctx, GLenum buffer)
 643 {
 644    GLframebuffer *fb = ctx->ReadBuffer;
 645
 646    (void) buffer;
 647
 648    /* add the renderbuffer on demand */
 649    st_manager_add_color_renderbuffer(ctx->st, fb, fb->_ColorReadBufferIndex);
 650    check_create_front_buffers(ctx, fb);
 651 }
 652
 653
 654 void st_init_fbo_functions(struct dd_function_table *functions)
 655 {
 656    functions->NewFramebuffer = st_new_framebuffer;
 657    functions->NewRenderbuffer = st_new_renderbuffer;
 658    functions->BindFramebuffer = st_bind_framebuffer;
 659    functions->FramebufferRenderbuffer = st_framebuffer_renderbuffer;
 660    functions->RenderTexture = st_render_texture;
 661    functions->FinishRenderTexture = st_finish_render_texture;
 662    functions->ValidateFramebuffer = st_validate_framebuffer;
 663    /* no longer needed by core Mesa, drivers handle resizes...
 664    functions->ResizeBuffers = st_resize_buffers;
 665    */
 666
 667    functions->DrawBuffers = st_DrawBuffers;
 668    functions->ReadBuffer = st_ReadBuffer;
 669 }
 670
 671 struct pipe_sampler_view *
 672 st_renderbuffer_get_sampler_view(struct st_renderbuffer *rb,
 673                                  struct pipe_context *pipe)
 674 {
 675    if (!rb->sampler_view) {
 676       rb->sampler_view = st_sampler_view_from_texture(pipe, rb->texture);
 677    }
 678
 679    return rb->sampler_view;
 680 }