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/mfeatures.h"
  42 #include "main/renderbuffer.h"
  43
  44 #include "pipe/p_context.h"
  45 #include "pipe/p_defines.h"
  46 #include "pipe/p_screen.h"
  47 #include "st_context.h"
  48 #include "st_cb_fbo.h"
  49 #include "st_cb_flush.h"
  50 #include "st_cb_texture.h"
  51 #include "st_format.h"
  52 #include "st_texture.h"
  53 #include "st_manager.h"
  54
  55 #include "util/u_format.h"
  56 #include "util/u_inlines.h"
  57 #include "util/u_surface.h"
  58
  59
  60 /**
  61  * gl_renderbuffer::AllocStorage()
  62  * This is called to allocate the original drawing surface, and
  63  * during window resize.
  64  */
  65 static GLboolean
  66 st_renderbuffer_alloc_storage(struct gl_context * ctx,
  67                               struct gl_renderbuffer *rb,
  68                               GLenum internalFormat,
  69                               GLuint width, GLuint height)
  70 {
  71    struct st_context *st = st_context(ctx);
  72    struct pipe_context *pipe = st->pipe;
  73    struct pipe_screen *screen = st->pipe->screen;
  74    struct st_renderbuffer *strb = st_renderbuffer(rb);
  75    enum pipe_format format;
  76    struct pipe_surface surf_tmpl;
  77
  78    if (internalFormat == GL_RGBA16_SNORM && strb->software) {
  79       /* Special case for software accum buffers.  Otherwise, if the
  80        * call to st_choose_renderbuffer_format() fails (because the
  81        * driver doesn't support signed 16-bit/channel colors) we'd
  82        * just return without allocating the software accum buffer.
  83        */
  84       format = PIPE_FORMAT_R16G16B16A16_SNORM;
  85    }
  86    else {
  87       format = st_choose_renderbuffer_format(screen, internalFormat,
  88                                              rb->NumSamples);
  89    }
  90
  91    if (format == PIPE_FORMAT_NONE) {
  92       return FALSE;
  93    }
  94
  95    /* init renderbuffer fields */
  96    strb->Base.Width  = width;
  97    strb->Base.Height = height;
  98    strb->Base.Format = st_pipe_format_to_mesa_format(format);
  99    strb->Base._BaseFormat = _mesa_base_fbo_format(ctx, internalFormat);
 100    strb->Base.DataType = st_format_datatype(format);
 101    strb->format = format;
 102
 103    strb->defined = GL_FALSE;  /* undefined contents now */
 104
 105    if (strb->software) {
 106       size_t size;
 107
 108       free(strb->data);
 109
 110       assert(strb->format != PIPE_FORMAT_NONE);
 111
 112       strb->stride = util_format_get_stride(strb->format, width);
 113       size = util_format_get_2d_size(strb->format, strb->stride, height);
 114
 115       strb->data = malloc(size);
 116
 117       return strb->data != NULL;
 118    }
 119    else {
 120       struct pipe_resource template;
 121
 122       /* Free the old surface and texture
 123        */
 124       pipe_surface_reference( &strb->surface, NULL );
 125       pipe_resource_reference( &strb->texture, NULL );
 126
 127       /* Setup new texture template.
 128        */
 129       memset(&template, 0, sizeof(template));
 130       template.target = st->internal_target;
 131       template.format = format;
 132       template.width0 = width;
 133       template.height0 = height;
 134       template.depth0 = 1;
 135       template.array_size = 1;
 136       template.last_level = 0;
 137       template.nr_samples = rb->NumSamples;
 138       if (util_format_is_depth_or_stencil(format)) {
 139          template.bind = PIPE_BIND_DEPTH_STENCIL;
 140       }
 141       else {
 142          template.bind = (PIPE_BIND_DISPLAY_TARGET |
 143                           PIPE_BIND_RENDER_TARGET);
 144       }
 145
 146       strb->texture = screen->resource_create(screen, &template);
 147
 148       if (!strb->texture)
 149          return FALSE;
 150
 151       memset(&surf_tmpl, 0, sizeof(surf_tmpl));
 152       u_surface_default_template(&surf_tmpl, strb->texture, template.bind);
 153       strb->surface = pipe->create_surface(pipe,
 154                                            strb->texture,
 155                                            &surf_tmpl);
 156       if (strb->surface) {
 157          assert(strb->surface->texture);
 158          assert(strb->surface->format);
 159          assert(strb->surface->width == width);
 160          assert(strb->surface->height == height);
 161       }
 162
 163       return strb->surface != NULL;
 164    }
 165 }
 166
 167
 168 /**
 169  * gl_renderbuffer::Delete()
 170  */
 171 static void
 172 st_renderbuffer_delete(struct gl_renderbuffer *rb)
 173 {
 174    struct st_renderbuffer *strb = st_renderbuffer(rb);
 175    ASSERT(strb);
 176    pipe_surface_reference(&strb->surface, NULL);
 177    pipe_resource_reference(&strb->texture, NULL);
 178    free(strb->data);
 179    free(strb);
 180 }
 181
 182
 183 /**
 184  * gl_renderbuffer::GetPointer()
 185  */
 186 static void *
 187 null_get_pointer(struct gl_context * ctx, struct gl_renderbuffer *rb,
 188                  GLint x, GLint y)
 189 {
 190    /* By returning NULL we force all software rendering to go through
 191     * the span routines.
 192     */
 193 #if 0
 194    assert(0);  /* Should never get called with softpipe */
 195 #endif
 196    return NULL;
 197 }
 198
 199
 200 /**
 201  * Called via ctx->Driver.NewFramebuffer()
 202  */
 203 static struct gl_framebuffer *
 204 st_new_framebuffer(struct gl_context *ctx, GLuint name)
 205 {
 206    /* XXX not sure we need to subclass gl_framebuffer for pipe */
 207    return _mesa_new_framebuffer(ctx, name);
 208 }
 209
 210
 211 /**
 212  * Called via ctx->Driver.NewRenderbuffer()
 213  */
 214 static struct gl_renderbuffer *
 215 st_new_renderbuffer(struct gl_context *ctx, GLuint name)
 216 {
 217    struct st_renderbuffer *strb = ST_CALLOC_STRUCT(st_renderbuffer);
 218    if (strb) {
 219       _mesa_init_renderbuffer(&strb->Base, name);
 220       strb->Base.Delete = st_renderbuffer_delete;
 221       strb->Base.AllocStorage = st_renderbuffer_alloc_storage;
 222       strb->Base.GetPointer = null_get_pointer;
 223       strb->format = PIPE_FORMAT_NONE;
 224       return &strb->Base;
 225    }
 226    return NULL;
 227 }
 228
 229
 230 /**
 231  * Allocate a renderbuffer for a an on-screen window (not a user-created
 232  * renderbuffer).  The window system code determines the format.
 233  */
 234 struct gl_renderbuffer *
 235 st_new_renderbuffer_fb(enum pipe_format format, int samples, boolean sw)
 236 {
 237    struct st_renderbuffer *strb;
 238
 239    strb = ST_CALLOC_STRUCT(st_renderbuffer);
 240    if (!strb) {
 241       _mesa_error(NULL, GL_OUT_OF_MEMORY, "creating renderbuffer");
 242       return NULL;
 243    }
 244
 245    _mesa_init_renderbuffer(&strb->Base, 0);
 246    strb->Base.ClassID = 0x4242; /* just a unique value */
 247    strb->Base.NumSamples = samples;
 248    strb->Base.Format = st_pipe_format_to_mesa_format(format);
 249    strb->Base._BaseFormat = _mesa_get_format_base_format(strb->Base.Format);
 250    strb->Base.DataType = st_format_datatype(format);
 251    strb->format = format;
 252    strb->software = sw;
 253
 254    switch (format) {
 255    case PIPE_FORMAT_R8G8B8A8_UNORM:
 256    case PIPE_FORMAT_B8G8R8A8_UNORM:
 257    case PIPE_FORMAT_A8R8G8B8_UNORM:
 258    case PIPE_FORMAT_R8G8B8X8_UNORM:
 259    case PIPE_FORMAT_B8G8R8X8_UNORM:
 260    case PIPE_FORMAT_X8R8G8B8_UNORM:
 261    case PIPE_FORMAT_B5G5R5A1_UNORM:
 262    case PIPE_FORMAT_B4G4R4A4_UNORM:
 263    case PIPE_FORMAT_B5G6R5_UNORM:
 264       strb->Base.InternalFormat = GL_RGBA;
 265       break;
 266    case PIPE_FORMAT_Z16_UNORM:
 267       strb->Base.InternalFormat = GL_DEPTH_COMPONENT16;
 268       break;
 269    case PIPE_FORMAT_Z32_UNORM:
 270       strb->Base.InternalFormat = GL_DEPTH_COMPONENT32;
 271       break;
 272    case PIPE_FORMAT_Z24_UNORM_S8_UINT:
 273    case PIPE_FORMAT_S8_UINT_Z24_UNORM:
 274    case PIPE_FORMAT_Z24X8_UNORM:
 275    case PIPE_FORMAT_X8Z24_UNORM:
 276       strb->Base.InternalFormat = GL_DEPTH24_STENCIL8_EXT;
 277       break;
 278    case PIPE_FORMAT_S8_UINT:
 279       strb->Base.InternalFormat = GL_STENCIL_INDEX8_EXT;
 280       break;
 281    case PIPE_FORMAT_R16G16B16A16_SNORM:
 282       /* accum buffer */
 283       strb->Base.InternalFormat = GL_RGBA16_SNORM;
 284       break;
 285    case PIPE_FORMAT_R8_UNORM:
 286       strb->Base.InternalFormat = GL_R8;
 287       break;
 288    case PIPE_FORMAT_R8G8_UNORM:
 289       strb->Base.InternalFormat = GL_RG8;
 290       break;
 291    case PIPE_FORMAT_R16_UNORM:
 292       strb->Base.InternalFormat = GL_R16;
 293       break;
 294    case PIPE_FORMAT_R16G16_UNORM:
 295       strb->Base.InternalFormat = GL_RG16;
 296       break;
 297    default:
 298       _mesa_problem(NULL,
 299                     "Unexpected format in st_new_renderbuffer_fb");
 300       free(strb);
 301       return NULL;
 302    }
 303
 304    /* st-specific methods */
 305    strb->Base.Delete = st_renderbuffer_delete;
 306    strb->Base.AllocStorage = st_renderbuffer_alloc_storage;
 307    strb->Base.GetPointer = null_get_pointer;
 308
 309    /* surface is allocated in st_renderbuffer_alloc_storage() */
 310    strb->surface = NULL;
 311
 312    return &strb->Base;
 313 }
 314
 315
 316
 317
 318 /**
 319  * Called via ctx->Driver.BindFramebufferEXT().
 320  */
 321 static void
 322 st_bind_framebuffer(struct gl_context *ctx, GLenum target,
 323                     struct gl_framebuffer *fb, struct gl_framebuffer *fbread)
 324 {
 325
 326 }
 327
 328 /**
 329  * Called by ctx->Driver.FramebufferRenderbuffer
 330  */
 331 static void
 332 st_framebuffer_renderbuffer(struct gl_context *ctx,
 333                             struct gl_framebuffer *fb,
 334                             GLenum attachment,
 335                             struct gl_renderbuffer *rb)
 336 {
 337    /* XXX no need for derivation? */
 338    _mesa_framebuffer_renderbuffer(ctx, fb, attachment, rb);
 339 }
 340
 341
 342 /**
 343  * Called by ctx->Driver.RenderTexture
 344  */
 345 static void
 346 st_render_texture(struct gl_context *ctx,
 347                   struct gl_framebuffer *fb,
 348                   struct gl_renderbuffer_attachment *att)
 349 {
 350    struct st_context *st = st_context(ctx);
 351    struct pipe_context *pipe = st->pipe;
 352    struct st_renderbuffer *strb;
 353    struct gl_renderbuffer *rb;
 354    struct pipe_resource *pt;
 355    struct st_texture_object *stObj;
 356    const struct gl_texture_image *texImage;
 357    struct pipe_surface surf_tmpl;
 358
 359    if (!st_finalize_texture(ctx, pipe, att->Texture))
 360       return;
 361
 362    pt = st_get_texobj_resource(att->Texture);
 363    assert(pt);
 364
 365    /* get pointer to texture image we're rendeing to */
 366    texImage = _mesa_get_attachment_teximage(att);
 367
 368    /* create new renderbuffer which wraps the texture image.
 369     * Use the texture's name as the renderbuffer's name so that we have
 370     * something that's non-zero (to determine vertical orientation) and
 371     * possibly helpful for debugging.
 372     */
 373    rb = st_new_renderbuffer(ctx, att->Texture->Name);
 374    if (!rb) {
 375       _mesa_error(ctx, GL_OUT_OF_MEMORY, "glFramebufferTexture()");
 376       return;
 377    }
 378
 379    _mesa_reference_renderbuffer(&att->Renderbuffer, rb);
 380    assert(rb->RefCount == 1);
 381    rb->AllocStorage = NULL; /* should not get called */
 382    strb = st_renderbuffer(rb);
 383
 384    assert(strb->Base.RefCount > 0);
 385
 386    /* get the texture for the texture object */
 387    stObj = st_texture_object(att->Texture);
 388
 389    /* point renderbuffer at texobject */
 390    strb->rtt = stObj;
 391    strb->rtt_level = att->TextureLevel;
 392    strb->rtt_face = att->CubeMapFace;
 393    strb->rtt_slice = att->Zoffset;
 394
 395    rb->Width = texImage->Width2;
 396    rb->Height = texImage->Height2;
 397    rb->_BaseFormat = texImage->_BaseFormat;
 398    rb->InternalFormat = texImage->InternalFormat;
 399    /*printf("***** render to texture level %d: %d x %d\n", att->TextureLevel, rb->Width, rb->Height);*/
 400
 401    /*printf("***** pipe texture %d x %d\n", pt->width0, pt->height0);*/
 402
 403    pipe_resource_reference( &strb->texture, pt );
 404
 405    pipe_surface_reference(&strb->surface, NULL);
 406
 407    assert(strb->rtt_level <= strb->texture->last_level);
 408
 409    /* new surface for rendering into the texture */
 410    memset(&surf_tmpl, 0, sizeof(surf_tmpl));
 411    surf_tmpl.format = ctx->Color.sRGBEnabled ? strb->texture->format : util_format_linear(strb->texture->format);
 412    surf_tmpl.usage = PIPE_BIND_RENDER_TARGET;
 413    surf_tmpl.u.tex.level = strb->rtt_level;
 414    surf_tmpl.u.tex.first_layer = strb->rtt_face + strb->rtt_slice;
 415    surf_tmpl.u.tex.last_layer = strb->rtt_face + strb->rtt_slice;
 416    strb->surface = pipe->create_surface(pipe,
 417                                         strb->texture,
 418                                         &surf_tmpl);
 419
 420    strb->format = pt->format;
 421
 422    strb->Base.Format = st_pipe_format_to_mesa_format(pt->format);
 423    strb->Base.DataType = st_format_datatype(pt->format);
 424
 425    /*
 426    printf("RENDER TO TEXTURE obj=%p pt=%p surf=%p  %d x %d\n",
 427           att->Texture, pt, strb->surface, rb->Width, rb->Height);
 428    */
 429
 430    /* Invalidate buffer state so that the pipe's framebuffer state
 431     * gets updated.
 432     * That's where the new renderbuffer (which we just created) gets
 433     * passed to the pipe as a (color/depth) render target.
 434     */
 435    st_invalidate_state(ctx, _NEW_BUFFERS);
 436 }
 437
 438
 439 /**
 440  * Called via ctx->Driver.FinishRenderTexture.
 441  */
 442 static void
 443 st_finish_render_texture(struct gl_context *ctx,
 444                          struct gl_renderbuffer_attachment *att)
 445 {
 446    struct st_renderbuffer *strb = st_renderbuffer(att->Renderbuffer);
 447
 448    if (!strb)
 449       return;
 450
 451    strb->rtt = NULL;
 452
 453    /*
 454    printf("FINISH RENDER TO TEXTURE surf=%p\n", strb->surface);
 455    */
 456
 457    /* restore previous framebuffer state */
 458    st_invalidate_state(ctx, _NEW_BUFFERS);
 459 }
 460
 461
 462 /**
 463  * Validate a renderbuffer attachment for a particular set of bindings.
 464  */
 465 static GLboolean
 466 st_validate_attachment(struct gl_context *ctx,
 467                        struct pipe_screen *screen,
 468                        const struct gl_renderbuffer_attachment *att,
 469                        unsigned bindings)
 470 {
 471    const struct st_texture_object *stObj = st_texture_object(att->Texture);
 472    enum pipe_format format;
 473    gl_format texFormat;
 474
 475    /* Only validate texture attachments for now, since
 476     * st_renderbuffer_alloc_storage makes sure that
 477     * the format is supported.
 478     */
 479    if (att->Type != GL_TEXTURE)
 480       return GL_TRUE;
 481
 482    if (!stObj)
 483       return GL_FALSE;
 484
 485    format = stObj->pt->format;
 486    texFormat = _mesa_get_attachment_teximage_const(att)->TexFormat;
 487
 488    /* If the encoding is sRGB and sRGB rendering cannot be enabled,
 489     * check for linear format support instead.
 490     * Later when we create a surface, we change the format to a linear one. */
 491    if (!ctx->Const.sRGBCapable &&
 492        _mesa_get_format_color_encoding(texFormat) == GL_SRGB) {
 493       const gl_format linearFormat = _mesa_get_srgb_format_linear(texFormat);
 494       format = st_mesa_format_to_pipe_format(linearFormat);
 495    }
 496
 497    return screen->is_format_supported(screen, format,
 498                                       PIPE_TEXTURE_2D,
 499                                       stObj->pt->nr_samples, bindings);
 500 }
 501
 502
 503 /**
 504  * Check if two renderbuffer attachments name a combined depth/stencil
 505  * renderbuffer.
 506  */
 507 GLboolean
 508 st_is_depth_stencil_combined(const struct gl_renderbuffer_attachment *depth,
 509                              const struct gl_renderbuffer_attachment *stencil)
 510 {
 511    assert(depth && stencil);
 512
 513    if (depth->Type == stencil->Type) {
 514       if (depth->Type == GL_RENDERBUFFER_EXT &&
 515           depth->Renderbuffer == stencil->Renderbuffer)
 516          return GL_TRUE;
 517
 518       if (depth->Type == GL_TEXTURE &&
 519           depth->Texture == stencil->Texture)
 520          return GL_TRUE;
 521    }
 522
 523    return GL_FALSE;
 524 }
 525
 526
 527 /**
 528  * Check that the framebuffer configuration is valid in terms of what
 529  * the driver can support.
 530  *
 531  * For Gallium we only supports combined Z+stencil, not separate buffers.
 532  */
 533 static void
 534 st_validate_framebuffer(struct gl_context *ctx, struct gl_framebuffer *fb)
 535 {
 536    struct st_context *st = st_context(ctx);
 537    struct pipe_screen *screen = st->pipe->screen;
 538    const struct gl_renderbuffer_attachment *depth =
 539          &fb->Attachment[BUFFER_DEPTH];
 540    const struct gl_renderbuffer_attachment *stencil =
 541          &fb->Attachment[BUFFER_STENCIL];
 542    GLuint i;
 543    enum pipe_format first_format = PIPE_FORMAT_NONE;
 544    boolean mixed_formats =
 545          screen->get_param(screen, PIPE_CAP_MIXED_COLORBUFFER_FORMATS) != 0;
 546
 547    if (depth->Type && stencil->Type && depth->Type != stencil->Type) {
 548       fb->_Status = GL_FRAMEBUFFER_UNSUPPORTED_EXT;
 549       return;
 550    }
 551    if (depth->Type == GL_RENDERBUFFER_EXT &&
 552        stencil->Type == GL_RENDERBUFFER_EXT &&
 553        depth->Renderbuffer != stencil->Renderbuffer) {
 554       fb->_Status = GL_FRAMEBUFFER_UNSUPPORTED_EXT;
 555       return;
 556    }
 557    if (depth->Type == GL_TEXTURE &&
 558        stencil->Type == GL_TEXTURE &&
 559        depth->Texture != stencil->Texture) {
 560       fb->_Status = GL_FRAMEBUFFER_UNSUPPORTED_EXT;
 561       return;
 562    }
 563
 564    if (!st_validate_attachment(ctx,
 565                                screen,
 566                                depth,
 567                                PIPE_BIND_DEPTH_STENCIL)) {
 568       fb->_Status = GL_FRAMEBUFFER_UNSUPPORTED_EXT;
 569       return;
 570    }
 571    if (!st_validate_attachment(ctx,
 572                                screen,
 573                                stencil,
 574                                PIPE_BIND_DEPTH_STENCIL)) {
 575       fb->_Status = GL_FRAMEBUFFER_UNSUPPORTED_EXT;
 576       return;
 577    }
 578    for (i = 0; i < ctx->Const.MaxColorAttachments; i++) {
 579       struct gl_renderbuffer_attachment *att =
 580             &fb->Attachment[BUFFER_COLOR0 + i];
 581       enum pipe_format format;
 582
 583       if (!st_validate_attachment(ctx,
 584                                   screen,
 585                                   att,
 586                                   PIPE_BIND_RENDER_TARGET)) {
 587          fb->_Status = GL_FRAMEBUFFER_UNSUPPORTED_EXT;
 588          return;
 589       }
 590
 591       if (!mixed_formats) {
 592          /* Disallow mixed formats. */
 593          if (att->Type != GL_NONE) {
 594             format = st_renderbuffer(att->Renderbuffer)->surface->format;
 595          } else {
 596             continue;
 597          }
 598
 599          if (first_format == PIPE_FORMAT_NONE) {
 600             first_format = format;
 601          } else if (format != first_format) {
 602             fb->_Status = GL_FRAMEBUFFER_UNSUPPORTED_EXT;
 603             return;
 604          }
 605       }
 606    }
 607 }
 608
 609
 610 /**
 611  * Called via glDrawBuffer.
 612  */
 613 static void
 614 st_DrawBuffers(struct gl_context *ctx, GLsizei count, const GLenum *buffers)
 615 {
 616    struct st_context *st = st_context(ctx);
 617    struct gl_framebuffer *fb = ctx->DrawBuffer;
 618    GLuint i;
 619
 620    (void) count;
 621    (void) buffers;
 622
 623    /* add the renderbuffers on demand */
 624    for (i = 0; i < fb->_NumColorDrawBuffers; i++) {
 625       gl_buffer_index idx = fb->_ColorDrawBufferIndexes[i];
 626       st_manager_add_color_renderbuffer(st, fb, idx);
 627    }
 628 }
 629
 630
 631 /**
 632  * Called via glReadBuffer.
 633  */
 634 static void
 635 st_ReadBuffer(struct gl_context *ctx, GLenum buffer)
 636 {
 637    struct st_context *st = st_context(ctx);
 638    struct gl_framebuffer *fb = ctx->ReadBuffer;
 639
 640    (void) buffer;
 641
 642    /* add the renderbuffer on demand */
 643    st_manager_add_color_renderbuffer(st, fb, fb->_ColorReadBufferIndex);
 644 }
 645
 646
 647
 648 /**
 649  * Called via ctx->Driver.MapRenderbuffer.
 650  */
 651 static void
 652 st_MapRenderbuffer(struct gl_context *ctx,
 653                    struct gl_renderbuffer *rb,
 654                    GLuint x, GLuint y, GLuint w, GLuint h,
 655                    GLbitfield mode,
 656                    GLubyte **mapOut, GLint *rowStrideOut)
 657 {
 658    struct st_context *st = st_context(ctx);
 659    struct st_renderbuffer *strb = st_renderbuffer(rb);
 660    struct pipe_context *pipe = st->pipe;
 661    const GLboolean invert = rb->Name == 0;
 662    unsigned usage;
 663    GLuint y2;
 664
 665    usage = 0x0;
 666    if (mode & GL_MAP_READ_BIT)
 667       usage |= PIPE_TRANSFER_READ;
 668    if (mode & GL_MAP_WRITE_BIT)
 669       usage |= PIPE_TRANSFER_WRITE;
 670
 671    /* Note: y=0=bottom of buffer while y2=0=top of buffer.
 672     * 'invert' will be true for window-system buffers and false for
 673     * user-allocated renderbuffers and textures.
 674     */
 675    if (invert)
 676       y2 = strb->Base.Height - y - h;
 677    else
 678       y2 = y;
 679
 680    strb->transfer = pipe_get_transfer(pipe,
 681                                       strb->texture,
 682                                       strb->rtt_level,
 683                                       strb->rtt_face + strb->rtt_slice,
 684                                       usage, x, y2, w, h);
 685    if (strb->transfer) {
 686       GLubyte *map = pipe_transfer_map(pipe, strb->transfer);
 687       if (invert) {
 688          *rowStrideOut = -strb->transfer->stride;
 689          map += (h - 1) * strb->transfer->stride;
 690       }
 691       else {
 692          *rowStrideOut = strb->transfer->stride;
 693       }
 694       *mapOut = map;
 695    }
 696    else {
 697       *mapOut = NULL;
 698       *rowStrideOut = 0;
 699    }
 700 }
 701
 702
 703 /**
 704  * Called via ctx->Driver.UnmapRenderbuffer.
 705  */
 706 static void
 707 st_UnmapRenderbuffer(struct gl_context *ctx,
 708                      struct gl_renderbuffer *rb)
 709 {
 710    struct st_context *st = st_context(ctx);
 711    struct st_renderbuffer *strb = st_renderbuffer(rb);
 712    struct pipe_context *pipe = st->pipe;
 713
 714    pipe_transfer_unmap(pipe, strb->transfer);
 715    pipe->transfer_destroy(pipe, strb->transfer);
 716    strb->transfer = NULL;
 717 }
 718
 719
 720
 721 void st_init_fbo_functions(struct dd_function_table *functions)
 722 {
 723 #if FEATURE_EXT_framebuffer_object
 724    functions->NewFramebuffer = st_new_framebuffer;
 725    functions->NewRenderbuffer = st_new_renderbuffer;
 726    functions->BindFramebuffer = st_bind_framebuffer;
 727    functions->FramebufferRenderbuffer = st_framebuffer_renderbuffer;
 728    functions->RenderTexture = st_render_texture;
 729    functions->FinishRenderTexture = st_finish_render_texture;
 730    functions->ValidateFramebuffer = st_validate_framebuffer;
 731 #endif
 732    /* no longer needed by core Mesa, drivers handle resizes...
 733    functions->ResizeBuffers = st_resize_buffers;
 734    */
 735
 736    functions->DrawBuffers = st_DrawBuffers;
 737    functions->ReadBuffer = st_ReadBuffer;
 738
 739    functions->MapRenderbuffer = st_MapRenderbuffer;
 740    functions->UnmapRenderbuffer = st_UnmapRenderbuffer;
 741 }
 742
 743