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