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 if (strb->Base.Name != 0) {
 142          /* this is a user-created renderbuffer */
 143          template.bind = PIPE_BIND_RENDER_TARGET;
 144       }
 145       else {
 146          /* this is a window-system buffer */
 147          template.bind = (PIPE_BIND_DISPLAY_TARGET |
 148                           PIPE_BIND_RENDER_TARGET);
 149       }
 150
 151       strb->texture = screen->resource_create(screen, &template);
 152
 153       if (!strb->texture)
 154          return FALSE;
 155
 156       u_surface_default_template(&surf_tmpl, strb->texture, template.bind);
 157       strb->surface = pipe->create_surface(pipe,
 158                                            strb->texture,
 159                                            &surf_tmpl);
 160       if (strb->surface) {
 161          assert(strb->surface->texture);
 162          assert(strb->surface->format);
 163          assert(strb->surface->width == width);
 164          assert(strb->surface->height == height);
 165       }
 166
 167       return strb->surface != NULL;
 168    }
 169 }
 170
 171
 172 /**
 173  * gl_renderbuffer::Delete()
 174  */
 175 static void
 176 st_renderbuffer_delete(struct gl_renderbuffer *rb)
 177 {
 178    struct st_renderbuffer *strb = st_renderbuffer(rb);
 179    ASSERT(strb);
 180    pipe_surface_reference(&strb->surface, NULL);
 181    pipe_resource_reference(&strb->texture, NULL);
 182    free(strb->data);
 183    free(strb);
 184 }
 185
 186
 187 /**
 188  * Called via ctx->Driver.NewFramebuffer()
 189  */
 190 static struct gl_framebuffer *
 191 st_new_framebuffer(struct gl_context *ctx, GLuint name)
 192 {
 193    /* XXX not sure we need to subclass gl_framebuffer for pipe */
 194    return _mesa_new_framebuffer(ctx, name);
 195 }
 196
 197
 198 /**
 199  * Called via ctx->Driver.NewRenderbuffer()
 200  */
 201 static struct gl_renderbuffer *
 202 st_new_renderbuffer(struct gl_context *ctx, GLuint name)
 203 {
 204    struct st_renderbuffer *strb = ST_CALLOC_STRUCT(st_renderbuffer);
 205    if (strb) {
 206       assert(name != 0);
 207       _mesa_init_renderbuffer(&strb->Base, name);
 208       strb->Base.Delete = st_renderbuffer_delete;
 209       strb->Base.AllocStorage = st_renderbuffer_alloc_storage;
 210       return &strb->Base;
 211    }
 212    return NULL;
 213 }
 214
 215
 216 /**
 217  * Allocate a renderbuffer for a an on-screen window (not a user-created
 218  * renderbuffer).  The window system code determines the format.
 219  */
 220 struct gl_renderbuffer *
 221 st_new_renderbuffer_fb(enum pipe_format format, int samples, boolean sw)
 222 {
 223    struct st_renderbuffer *strb;
 224
 225    strb = ST_CALLOC_STRUCT(st_renderbuffer);
 226    if (!strb) {
 227       _mesa_error(NULL, GL_OUT_OF_MEMORY, "creating renderbuffer");
 228       return NULL;
 229    }
 230
 231    _mesa_init_renderbuffer(&strb->Base, 0);
 232    strb->Base.ClassID = 0x4242; /* just a unique value */
 233    strb->Base.NumSamples = samples;
 234    strb->Base.Format = st_pipe_format_to_mesa_format(format);
 235    strb->Base._BaseFormat = _mesa_get_format_base_format(strb->Base.Format);
 236    strb->software = sw;
 237
 238    switch (format) {
 239    case PIPE_FORMAT_R8G8B8A8_UNORM:
 240    case PIPE_FORMAT_B8G8R8A8_UNORM:
 241    case PIPE_FORMAT_A8R8G8B8_UNORM:
 242    case PIPE_FORMAT_R8G8B8X8_UNORM:
 243    case PIPE_FORMAT_B8G8R8X8_UNORM:
 244    case PIPE_FORMAT_X8R8G8B8_UNORM:
 245    case PIPE_FORMAT_B5G5R5A1_UNORM:
 246    case PIPE_FORMAT_B4G4R4A4_UNORM:
 247    case PIPE_FORMAT_B5G6R5_UNORM:
 248       strb->Base.InternalFormat = GL_RGBA;
 249       break;
 250    case PIPE_FORMAT_Z16_UNORM:
 251       strb->Base.InternalFormat = GL_DEPTH_COMPONENT16;
 252       break;
 253    case PIPE_FORMAT_Z32_UNORM:
 254       strb->Base.InternalFormat = GL_DEPTH_COMPONENT32;
 255       break;
 256    case PIPE_FORMAT_Z24_UNORM_S8_UINT:
 257    case PIPE_FORMAT_S8_UINT_Z24_UNORM:
 258    case PIPE_FORMAT_Z24X8_UNORM:
 259    case PIPE_FORMAT_X8Z24_UNORM:
 260       strb->Base.InternalFormat = GL_DEPTH24_STENCIL8_EXT;
 261       break;
 262    case PIPE_FORMAT_S8_UINT:
 263       strb->Base.InternalFormat = GL_STENCIL_INDEX8_EXT;
 264       break;
 265    case PIPE_FORMAT_R16G16B16A16_SNORM:
 266       /* accum buffer */
 267       strb->Base.InternalFormat = GL_RGBA16_SNORM;
 268       break;
 269    case PIPE_FORMAT_R8_UNORM:
 270       strb->Base.InternalFormat = GL_R8;
 271       break;
 272    case PIPE_FORMAT_R8G8_UNORM:
 273       strb->Base.InternalFormat = GL_RG8;
 274       break;
 275    case PIPE_FORMAT_R16_UNORM:
 276       strb->Base.InternalFormat = GL_R16;
 277       break;
 278    case PIPE_FORMAT_R16G16_UNORM:
 279       strb->Base.InternalFormat = GL_RG16;
 280       break;
 281    default:
 282       _mesa_problem(NULL,
 283                     "Unexpected format in st_new_renderbuffer_fb");
 284       free(strb);
 285       return NULL;
 286    }
 287
 288    /* st-specific methods */
 289    strb->Base.Delete = st_renderbuffer_delete;
 290    strb->Base.AllocStorage = st_renderbuffer_alloc_storage;
 291
 292    /* surface is allocated in st_renderbuffer_alloc_storage() */
 293    strb->surface = NULL;
 294
 295    return &strb->Base;
 296 }
 297
 298
 299
 300
 301 /**
 302  * Called via ctx->Driver.BindFramebufferEXT().
 303  */
 304 static void
 305 st_bind_framebuffer(struct gl_context *ctx, GLenum target,
 306                     struct gl_framebuffer *fb, struct gl_framebuffer *fbread)
 307 {
 308
 309 }
 310
 311 /**
 312  * Called by ctx->Driver.FramebufferRenderbuffer
 313  */
 314 static void
 315 st_framebuffer_renderbuffer(struct gl_context *ctx,
 316                             struct gl_framebuffer *fb,
 317                             GLenum attachment,
 318                             struct gl_renderbuffer *rb)
 319 {
 320    /* XXX no need for derivation? */
 321    _mesa_framebuffer_renderbuffer(ctx, fb, attachment, rb);
 322 }
 323
 324
 325 /**
 326  * Called by ctx->Driver.RenderTexture
 327  */
 328 static void
 329 st_render_texture(struct gl_context *ctx,
 330                   struct gl_framebuffer *fb,
 331                   struct gl_renderbuffer_attachment *att)
 332 {
 333    struct st_context *st = st_context(ctx);
 334    struct pipe_context *pipe = st->pipe;
 335    struct st_renderbuffer *strb;
 336    struct gl_renderbuffer *rb;
 337    struct pipe_resource *pt;
 338    struct st_texture_object *stObj;
 339    const struct gl_texture_image *texImage;
 340    struct pipe_surface surf_tmpl;
 341
 342    if (!st_finalize_texture(ctx, pipe, att->Texture))
 343       return;
 344
 345    pt = st_get_texobj_resource(att->Texture);
 346    assert(pt);
 347
 348    /* get pointer to texture image we're rendeing to */
 349    texImage = _mesa_get_attachment_teximage(att);
 350
 351    /* create new renderbuffer which wraps the texture image.
 352     * Use the texture's name as the renderbuffer's name so that we have
 353     * something that's non-zero (to determine vertical orientation) and
 354     * possibly helpful for debugging.
 355     */
 356    rb = st_new_renderbuffer(ctx, att->Texture->Name);
 357    if (!rb) {
 358       _mesa_error(ctx, GL_OUT_OF_MEMORY, "glFramebufferTexture()");
 359       return;
 360    }
 361
 362    _mesa_reference_renderbuffer(&att->Renderbuffer, rb);
 363    assert(rb->RefCount == 1);
 364    rb->AllocStorage = NULL; /* should not get called */
 365    strb = st_renderbuffer(rb);
 366
 367    assert(strb->Base.RefCount > 0);
 368
 369    /* get the texture for the texture object */
 370    stObj = st_texture_object(att->Texture);
 371
 372    /* point renderbuffer at texobject */
 373    strb->rtt = stObj;
 374    strb->rtt_level = att->TextureLevel;
 375    strb->rtt_face = att->CubeMapFace;
 376    strb->rtt_slice = att->Zoffset;
 377
 378    rb->Width = texImage->Width2;
 379    rb->Height = texImage->Height2;
 380    rb->_BaseFormat = texImage->_BaseFormat;
 381    rb->InternalFormat = texImage->InternalFormat;
 382    /*printf("***** render to texture level %d: %d x %d\n", att->TextureLevel, rb->Width, rb->Height);*/
 383
 384    /*printf("***** pipe texture %d x %d\n", pt->width0, pt->height0);*/
 385
 386    pipe_resource_reference( &strb->texture, pt );
 387
 388    pipe_surface_reference(&strb->surface, NULL);
 389
 390    assert(strb->rtt_level <= strb->texture->last_level);
 391
 392    /* new surface for rendering into the texture */
 393    memset(&surf_tmpl, 0, sizeof(surf_tmpl));
 394    surf_tmpl.format = ctx->Color.sRGBEnabled ? strb->texture->format : util_format_linear(strb->texture->format);
 395    surf_tmpl.usage = PIPE_BIND_RENDER_TARGET;
 396    surf_tmpl.u.tex.level = strb->rtt_level;
 397    surf_tmpl.u.tex.first_layer = strb->rtt_face + strb->rtt_slice;
 398    surf_tmpl.u.tex.last_layer = strb->rtt_face + strb->rtt_slice;
 399    strb->surface = pipe->create_surface(pipe,
 400                                         strb->texture,
 401                                         &surf_tmpl);
 402
 403    strb->Base.Format = st_pipe_format_to_mesa_format(pt->format);
 404
 405    /*
 406    printf("RENDER TO TEXTURE obj=%p pt=%p surf=%p  %d x %d\n",
 407           att->Texture, pt, strb->surface, rb->Width, rb->Height);
 408    */
 409
 410    /* Invalidate buffer state so that the pipe's framebuffer state
 411     * gets updated.
 412     * That's where the new renderbuffer (which we just created) gets
 413     * passed to the pipe as a (color/depth) render target.
 414     */
 415    st_invalidate_state(ctx, _NEW_BUFFERS);
 416 }
 417
 418
 419 /**
 420  * Called via ctx->Driver.FinishRenderTexture.
 421  */
 422 static void
 423 st_finish_render_texture(struct gl_context *ctx,
 424                          struct gl_renderbuffer_attachment *att)
 425 {
 426    struct st_renderbuffer *strb = st_renderbuffer(att->Renderbuffer);
 427
 428    if (!strb)
 429       return;
 430
 431    strb->rtt = NULL;
 432
 433    /*
 434    printf("FINISH RENDER TO TEXTURE surf=%p\n", strb->surface);
 435    */
 436
 437    /* restore previous framebuffer state */
 438    st_invalidate_state(ctx, _NEW_BUFFERS);
 439 }
 440
 441
 442 /**
 443  * Validate a renderbuffer attachment for a particular set of bindings.
 444  */
 445 static GLboolean
 446 st_validate_attachment(struct gl_context *ctx,
 447                        struct pipe_screen *screen,
 448                        const struct gl_renderbuffer_attachment *att,
 449                        unsigned bindings)
 450 {
 451    const struct st_texture_object *stObj = st_texture_object(att->Texture);
 452    enum pipe_format format;
 453    gl_format texFormat;
 454
 455    /* Only validate texture attachments for now, since
 456     * st_renderbuffer_alloc_storage makes sure that
 457     * the format is supported.
 458     */
 459    if (att->Type != GL_TEXTURE)
 460       return GL_TRUE;
 461
 462    if (!stObj)
 463       return GL_FALSE;
 464
 465    format = stObj->pt->format;
 466    texFormat = _mesa_get_attachment_teximage_const(att)->TexFormat;
 467
 468    /* If the encoding is sRGB and sRGB rendering cannot be enabled,
 469     * check for linear format support instead.
 470     * Later when we create a surface, we change the format to a linear one. */
 471    if (!ctx->Extensions.EXT_framebuffer_sRGB &&
 472        _mesa_get_format_color_encoding(texFormat) == GL_SRGB) {
 473       const gl_format linearFormat = _mesa_get_srgb_format_linear(texFormat);
 474       format = st_mesa_format_to_pipe_format(linearFormat);
 475    }
 476
 477    return screen->is_format_supported(screen, format,
 478                                       PIPE_TEXTURE_2D,
 479                                       stObj->pt->nr_samples, bindings);
 480 }
 481
 482
 483 /**
 484  * Check if two renderbuffer attachments name a combined depth/stencil
 485  * renderbuffer.
 486  */
 487 GLboolean
 488 st_is_depth_stencil_combined(const struct gl_renderbuffer_attachment *depth,
 489                              const struct gl_renderbuffer_attachment *stencil)
 490 {
 491    assert(depth && stencil);
 492
 493    if (depth->Type == stencil->Type) {
 494       if (depth->Type == GL_RENDERBUFFER_EXT &&
 495           depth->Renderbuffer == stencil->Renderbuffer)
 496          return GL_TRUE;
 497
 498       if (depth->Type == GL_TEXTURE &&
 499           depth->Texture == stencil->Texture)
 500          return GL_TRUE;
 501    }
 502
 503    return GL_FALSE;
 504 }
 505
 506
 507 /**
 508  * Check that the framebuffer configuration is valid in terms of what
 509  * the driver can support.
 510  *
 511  * For Gallium we only supports combined Z+stencil, not separate buffers.
 512  */
 513 static void
 514 st_validate_framebuffer(struct gl_context *ctx, struct gl_framebuffer *fb)
 515 {
 516    struct st_context *st = st_context(ctx);
 517    struct pipe_screen *screen = st->pipe->screen;
 518    const struct gl_renderbuffer_attachment *depth =
 519          &fb->Attachment[BUFFER_DEPTH];
 520    const struct gl_renderbuffer_attachment *stencil =
 521          &fb->Attachment[BUFFER_STENCIL];
 522    GLuint i;
 523    enum pipe_format first_format = PIPE_FORMAT_NONE;
 524    boolean mixed_formats =
 525          screen->get_param(screen, PIPE_CAP_MIXED_COLORBUFFER_FORMATS) != 0;
 526
 527    if (depth->Type && stencil->Type && depth->Type != stencil->Type) {
 528       fb->_Status = GL_FRAMEBUFFER_UNSUPPORTED_EXT;
 529       return;
 530    }
 531    if (depth->Type == GL_RENDERBUFFER_EXT &&
 532        stencil->Type == GL_RENDERBUFFER_EXT &&
 533        depth->Renderbuffer != stencil->Renderbuffer) {
 534       fb->_Status = GL_FRAMEBUFFER_UNSUPPORTED_EXT;
 535       return;
 536    }
 537    if (depth->Type == GL_TEXTURE &&
 538        stencil->Type == GL_TEXTURE &&
 539        depth->Texture != stencil->Texture) {
 540       fb->_Status = GL_FRAMEBUFFER_UNSUPPORTED_EXT;
 541       return;
 542    }
 543
 544    if (!st_validate_attachment(ctx,
 545                                screen,
 546                                depth,
 547                                PIPE_BIND_DEPTH_STENCIL)) {
 548       fb->_Status = GL_FRAMEBUFFER_UNSUPPORTED_EXT;
 549       return;
 550    }
 551    if (!st_validate_attachment(ctx,
 552                                screen,
 553                                stencil,
 554                                PIPE_BIND_DEPTH_STENCIL)) {
 555       fb->_Status = GL_FRAMEBUFFER_UNSUPPORTED_EXT;
 556       return;
 557    }
 558    for (i = 0; i < ctx->Const.MaxColorAttachments; i++) {
 559       struct gl_renderbuffer_attachment *att =
 560             &fb->Attachment[BUFFER_COLOR0 + i];
 561       enum pipe_format format;
 562
 563       if (!st_validate_attachment(ctx,
 564                                   screen,
 565                                   att,
 566                                   PIPE_BIND_RENDER_TARGET)) {
 567          fb->_Status = GL_FRAMEBUFFER_UNSUPPORTED_EXT;
 568          return;
 569       }
 570
 571       if (!mixed_formats) {
 572          /* Disallow mixed formats. */
 573          if (att->Type != GL_NONE) {
 574             format = st_renderbuffer(att->Renderbuffer)->surface->format;
 575          } else {
 576             continue;
 577          }
 578
 579          if (first_format == PIPE_FORMAT_NONE) {
 580             first_format = format;
 581          } else if (format != first_format) {
 582             fb->_Status = GL_FRAMEBUFFER_UNSUPPORTED_EXT;
 583             return;
 584          }
 585       }
 586    }
 587 }
 588
 589
 590 /**
 591  * Called via glDrawBuffer.
 592  */
 593 static void
 594 st_DrawBuffers(struct gl_context *ctx, GLsizei count, const GLenum *buffers)
 595 {
 596    struct st_context *st = st_context(ctx);
 597    struct gl_framebuffer *fb = ctx->DrawBuffer;
 598    GLuint i;
 599
 600    (void) count;
 601    (void) buffers;
 602
 603    /* add the renderbuffers on demand */
 604    for (i = 0; i < fb->_NumColorDrawBuffers; i++) {
 605       gl_buffer_index idx = fb->_ColorDrawBufferIndexes[i];
 606       st_manager_add_color_renderbuffer(st, fb, idx);
 607    }
 608 }
 609
 610
 611 /**
 612  * Called via glReadBuffer.
 613  */
 614 static void
 615 st_ReadBuffer(struct gl_context *ctx, GLenum buffer)
 616 {
 617    struct st_context *st = st_context(ctx);
 618    struct gl_framebuffer *fb = ctx->ReadBuffer;
 619
 620    (void) buffer;
 621
 622    /* add the renderbuffer on demand */
 623    st_manager_add_color_renderbuffer(st, fb, fb->_ColorReadBufferIndex);
 624 }
 625
 626
 627
 628 /**
 629  * Called via ctx->Driver.MapRenderbuffer.
 630  */
 631 static void
 632 st_MapRenderbuffer(struct gl_context *ctx,
 633                    struct gl_renderbuffer *rb,
 634                    GLuint x, GLuint y, GLuint w, GLuint h,
 635                    GLbitfield mode,
 636                    GLubyte **mapOut, GLint *rowStrideOut)
 637 {
 638    struct st_context *st = st_context(ctx);
 639    struct st_renderbuffer *strb = st_renderbuffer(rb);
 640    struct pipe_context *pipe = st->pipe;
 641    const GLboolean invert = rb->Name == 0;
 642    unsigned usage;
 643    GLuint y2;
 644
 645    if (strb->software) {
 646       /* software-allocated renderbuffer (probably an accum buffer) */
 647       if (strb->data) {
 648          GLint bpp = _mesa_get_format_bytes(strb->Base.Format);
 649          GLint stride = _mesa_format_row_stride(strb->Base.Format,
 650                                                 strb->Base.Width);
 651          *mapOut = (GLubyte *) strb->data + y * stride + x * bpp;
 652          *rowStrideOut = stride;
 653       }
 654       else {
 655          *mapOut = NULL;
 656          *rowStrideOut = 0;
 657       }
 658       return;
 659    }
 660
 661    usage = 0x0;
 662    if (mode & GL_MAP_READ_BIT)
 663       usage |= PIPE_TRANSFER_READ;
 664    if (mode & GL_MAP_WRITE_BIT)
 665       usage |= PIPE_TRANSFER_WRITE;
 666    if (mode & GL_MAP_INVALIDATE_RANGE_BIT)
 667       usage |= PIPE_TRANSFER_DISCARD_RANGE;
 668
 669    /* Note: y=0=bottom of buffer while y2=0=top of buffer.
 670     * 'invert' will be true for window-system buffers and false for
 671     * user-allocated renderbuffers and textures.
 672     */
 673    if (invert)
 674       y2 = strb->Base.Height - y - h;
 675    else
 676       y2 = y;
 677
 678    strb->transfer = pipe_get_transfer(pipe,
 679                                       strb->texture,
 680                                       strb->rtt_level,
 681                                       strb->rtt_face + strb->rtt_slice,
 682                                       usage, x, y2, w, h);
 683    if (strb->transfer) {
 684       GLubyte *map = pipe_transfer_map(pipe, strb->transfer);
 685       if (invert) {
 686          *rowStrideOut = -strb->transfer->stride;
 687          map += (h - 1) * strb->transfer->stride;
 688       }
 689       else {
 690          *rowStrideOut = strb->transfer->stride;
 691       }
 692       *mapOut = map;
 693    }
 694    else {
 695       *mapOut = NULL;
 696       *rowStrideOut = 0;
 697    }
 698 }
 699
 700
 701 /**
 702  * Called via ctx->Driver.UnmapRenderbuffer.
 703  */
 704 static void
 705 st_UnmapRenderbuffer(struct gl_context *ctx,
 706                      struct gl_renderbuffer *rb)
 707 {
 708    struct st_context *st = st_context(ctx);
 709    struct st_renderbuffer *strb = st_renderbuffer(rb);
 710    struct pipe_context *pipe = st->pipe;
 711
 712    if (strb->software) {
 713       /* software-allocated renderbuffer (probably an accum buffer) */
 714       return;
 715    }
 716
 717    pipe_transfer_unmap(pipe, strb->transfer);
 718    pipe->transfer_destroy(pipe, strb->transfer);
 719    strb->transfer = NULL;
 720 }
 721
 722
 723
 724 void st_init_fbo_functions(struct dd_function_table *functions)
 725 {
 726 #if FEATURE_EXT_framebuffer_object
 727    functions->NewFramebuffer = st_new_framebuffer;
 728    functions->NewRenderbuffer = st_new_renderbuffer;
 729    functions->BindFramebuffer = st_bind_framebuffer;
 730    functions->FramebufferRenderbuffer = st_framebuffer_renderbuffer;
 731    functions->RenderTexture = st_render_texture;
 732    functions->FinishRenderTexture = st_finish_render_texture;
 733    functions->ValidateFramebuffer = st_validate_framebuffer;
 734 #endif
 735    /* no longer needed by core Mesa, drivers handle resizes...
 736    functions->ResizeBuffers = st_resize_buffers;
 737    */
 738
 739    functions->DrawBuffers = st_DrawBuffers;
 740    functions->ReadBuffer = st_ReadBuffer;
 741
 742    functions->MapRenderbuffer = st_MapRenderbuffer;
 743    functions->UnmapRenderbuffer = st_UnmapRenderbuffer;
 744 }
 745
 746