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