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->format = format;
 101
 102    strb->defined = GL_FALSE;  /* undefined contents now */
 103
 104    if (strb->software) {
 105       size_t size;
 106
 107       free(strb->data);
 108
 109       assert(strb->format != PIPE_FORMAT_NONE);
 110
 111       strb->stride = util_format_get_stride(strb->format, width);
 112       size = util_format_get_2d_size(strb->format, strb->stride, height);
 113
 114       strb->data = malloc(size);
 115
 116       return strb->data != NULL;
 117    }
 118    else {
 119       struct pipe_resource template;
 120
 121       /* Free the old surface and texture
 122        */
 123       pipe_surface_reference( &strb->surface, NULL );
 124       pipe_resource_reference( &strb->texture, NULL );
 125
 126       if (width == 0 || height == 0) {
 127          /* if size is zero, nothing to allocate */
 128          return GL_TRUE;
 129       }
 130
 131       /* Setup new texture template.
 132        */
 133       memset(&template, 0, sizeof(template));
 134       template.target = st->internal_target;
 135       template.format = format;
 136       template.width0 = width;
 137       template.height0 = height;
 138       template.depth0 = 1;
 139       template.array_size = 1;
 140       template.last_level = 0;
 141       template.nr_samples = rb->NumSamples;
 142       if (util_format_is_depth_or_stencil(format)) {
 143          template.bind = PIPE_BIND_DEPTH_STENCIL;
 144       }
 145       else {
 146          template.bind = (PIPE_BIND_DISPLAY_TARGET |
 147                           PIPE_BIND_RENDER_TARGET);
 148       }
 149
 150       strb->texture = screen->resource_create(screen, &template);
 151
 152       if (!strb->texture)
 153          return FALSE;
 154
 155       memset(&surf_tmpl, 0, sizeof(surf_tmpl));
 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       _mesa_init_renderbuffer(&strb->Base, name);
 207       strb->Base.Delete = st_renderbuffer_delete;
 208       strb->Base.AllocStorage = st_renderbuffer_alloc_storage;
 209       strb->format = PIPE_FORMAT_NONE;
 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->format = format;
 237    strb->software = sw;
 238
 239    switch (format) {
 240    case PIPE_FORMAT_R8G8B8A8_UNORM:
 241    case PIPE_FORMAT_B8G8R8A8_UNORM:
 242    case PIPE_FORMAT_A8R8G8B8_UNORM:
 243    case PIPE_FORMAT_R8G8B8X8_UNORM:
 244    case PIPE_FORMAT_B8G8R8X8_UNORM:
 245    case PIPE_FORMAT_X8R8G8B8_UNORM:
 246    case PIPE_FORMAT_B5G5R5A1_UNORM:
 247    case PIPE_FORMAT_B4G4R4A4_UNORM:
 248    case PIPE_FORMAT_B5G6R5_UNORM:
 249       strb->Base.InternalFormat = GL_RGBA;
 250       break;
 251    case PIPE_FORMAT_Z16_UNORM:
 252       strb->Base.InternalFormat = GL_DEPTH_COMPONENT16;
 253       break;
 254    case PIPE_FORMAT_Z32_UNORM:
 255       strb->Base.InternalFormat = GL_DEPTH_COMPONENT32;
 256       break;
 257    case PIPE_FORMAT_Z24_UNORM_S8_UINT:
 258    case PIPE_FORMAT_S8_UINT_Z24_UNORM:
 259    case PIPE_FORMAT_Z24X8_UNORM:
 260    case PIPE_FORMAT_X8Z24_UNORM:
 261       strb->Base.InternalFormat = GL_DEPTH24_STENCIL8_EXT;
 262       break;
 263    case PIPE_FORMAT_S8_UINT:
 264       strb->Base.InternalFormat = GL_STENCIL_INDEX8_EXT;
 265       break;
 266    case PIPE_FORMAT_R16G16B16A16_SNORM:
 267       /* accum buffer */
 268       strb->Base.InternalFormat = GL_RGBA16_SNORM;
 269       break;
 270    case PIPE_FORMAT_R8_UNORM:
 271       strb->Base.InternalFormat = GL_R8;
 272       break;
 273    case PIPE_FORMAT_R8G8_UNORM:
 274       strb->Base.InternalFormat = GL_RG8;
 275       break;
 276    case PIPE_FORMAT_R16_UNORM:
 277       strb->Base.InternalFormat = GL_R16;
 278       break;
 279    case PIPE_FORMAT_R16G16_UNORM:
 280       strb->Base.InternalFormat = GL_RG16;
 281       break;
 282    default:
 283       _mesa_problem(NULL,
 284                     "Unexpected format in st_new_renderbuffer_fb");
 285       free(strb);
 286       return NULL;
 287    }
 288
 289    /* st-specific methods */
 290    strb->Base.Delete = st_renderbuffer_delete;
 291    strb->Base.AllocStorage = st_renderbuffer_alloc_storage;
 292
 293    /* surface is allocated in st_renderbuffer_alloc_storage() */
 294    strb->surface = NULL;
 295
 296    return &strb->Base;
 297 }
 298
 299
 300
 301
 302 /**
 303  * Called via ctx->Driver.BindFramebufferEXT().
 304  */
 305 static void
 306 st_bind_framebuffer(struct gl_context *ctx, GLenum target,
 307                     struct gl_framebuffer *fb, struct gl_framebuffer *fbread)
 308 {
 309
 310 }
 311
 312 /**
 313  * Called by ctx->Driver.FramebufferRenderbuffer
 314  */
 315 static void
 316 st_framebuffer_renderbuffer(struct gl_context *ctx,
 317                             struct gl_framebuffer *fb,
 318                             GLenum attachment,
 319                             struct gl_renderbuffer *rb)
 320 {
 321    /* XXX no need for derivation? */
 322    _mesa_framebuffer_renderbuffer(ctx, fb, attachment, rb);
 323 }
 324
 325
 326 /**
 327  * Called by ctx->Driver.RenderTexture
 328  */
 329 static void
 330 st_render_texture(struct gl_context *ctx,
 331                   struct gl_framebuffer *fb,
 332                   struct gl_renderbuffer_attachment *att)
 333 {
 334    struct st_context *st = st_context(ctx);
 335    struct pipe_context *pipe = st->pipe;
 336    struct st_renderbuffer *strb;
 337    struct gl_renderbuffer *rb;
 338    struct pipe_resource *pt;
 339    struct st_texture_object *stObj;
 340    const struct gl_texture_image *texImage;
 341    struct pipe_surface surf_tmpl;
 342
 343    if (!st_finalize_texture(ctx, pipe, att->Texture))
 344       return;
 345
 346    pt = st_get_texobj_resource(att->Texture);
 347    assert(pt);
 348
 349    /* get pointer to texture image we're rendeing to */
 350    texImage = _mesa_get_attachment_teximage(att);
 351
 352    /* create new renderbuffer which wraps the texture image.
 353     * Use the texture's name as the renderbuffer's name so that we have
 354     * something that's non-zero (to determine vertical orientation) and
 355     * possibly helpful for debugging.
 356     */
 357    rb = st_new_renderbuffer(ctx, att->Texture->Name);
 358    if (!rb) {
 359       _mesa_error(ctx, GL_OUT_OF_MEMORY, "glFramebufferTexture()");
 360       return;
 361    }
 362
 363    _mesa_reference_renderbuffer(&att->Renderbuffer, rb);
 364    assert(rb->RefCount == 1);
 365    rb->AllocStorage = NULL; /* should not get called */
 366    strb = st_renderbuffer(rb);
 367
 368    assert(strb->Base.RefCount > 0);
 369
 370    /* get the texture for the texture object */
 371    stObj = st_texture_object(att->Texture);
 372
 373    /* point renderbuffer at texobject */
 374    strb->rtt = stObj;
 375    strb->rtt_level = att->TextureLevel;
 376    strb->rtt_face = att->CubeMapFace;
 377    strb->rtt_slice = att->Zoffset;
 378
 379    rb->Width = texImage->Width2;
 380    rb->Height = texImage->Height2;
 381    rb->_BaseFormat = texImage->_BaseFormat;
 382    rb->InternalFormat = texImage->InternalFormat;
 383    /*printf("***** render to texture level %d: %d x %d\n", att->TextureLevel, rb->Width, rb->Height);*/
 384
 385    /*printf("***** pipe texture %d x %d\n", pt->width0, pt->height0);*/
 386
 387    pipe_resource_reference( &strb->texture, pt );
 388
 389    pipe_surface_reference(&strb->surface, NULL);
 390
 391    assert(strb->rtt_level <= strb->texture->last_level);
 392
 393    /* new surface for rendering into the texture */
 394    memset(&surf_tmpl, 0, sizeof(surf_tmpl));
 395    surf_tmpl.format = ctx->Color.sRGBEnabled ? strb->texture->format : util_format_linear(strb->texture->format);
 396    surf_tmpl.usage = PIPE_BIND_RENDER_TARGET;
 397    surf_tmpl.u.tex.level = strb->rtt_level;
 398    surf_tmpl.u.tex.first_layer = strb->rtt_face + strb->rtt_slice;
 399    surf_tmpl.u.tex.last_layer = strb->rtt_face + strb->rtt_slice;
 400    strb->surface = pipe->create_surface(pipe,
 401                                         strb->texture,
 402                                         &surf_tmpl);
 403
 404    strb->format = pt->format;
 405
 406    strb->Base.Format = st_pipe_format_to_mesa_format(pt->format);
 407
 408    /*
 409    printf("RENDER TO TEXTURE obj=%p pt=%p surf=%p  %d x %d\n",
 410           att->Texture, pt, strb->surface, rb->Width, rb->Height);
 411    */
 412
 413    /* Invalidate buffer state so that the pipe's framebuffer state
 414     * gets updated.
 415     * That's where the new renderbuffer (which we just created) gets
 416     * passed to the pipe as a (color/depth) render target.
 417     */
 418    st_invalidate_state(ctx, _NEW_BUFFERS);
 419 }
 420
 421
 422 /**
 423  * Called via ctx->Driver.FinishRenderTexture.
 424  */
 425 static void
 426 st_finish_render_texture(struct gl_context *ctx,
 427                          struct gl_renderbuffer_attachment *att)
 428 {
 429    struct st_renderbuffer *strb = st_renderbuffer(att->Renderbuffer);
 430
 431    if (!strb)
 432       return;
 433
 434    strb->rtt = NULL;
 435
 436    /*
 437    printf("FINISH RENDER TO TEXTURE surf=%p\n", strb->surface);
 438    */
 439
 440    /* restore previous framebuffer state */
 441    st_invalidate_state(ctx, _NEW_BUFFERS);
 442 }
 443
 444
 445 /**
 446  * Validate a renderbuffer attachment for a particular set of bindings.
 447  */
 448 static GLboolean
 449 st_validate_attachment(struct gl_context *ctx,
 450                        struct pipe_screen *screen,
 451                        const struct gl_renderbuffer_attachment *att,
 452                        unsigned bindings)
 453 {
 454    const struct st_texture_object *stObj = st_texture_object(att->Texture);
 455    enum pipe_format format;
 456    gl_format texFormat;
 457
 458    /* Only validate texture attachments for now, since
 459     * st_renderbuffer_alloc_storage makes sure that
 460     * the format is supported.
 461     */
 462    if (att->Type != GL_TEXTURE)
 463       return GL_TRUE;
 464
 465    if (!stObj)
 466       return GL_FALSE;
 467
 468    format = stObj->pt->format;
 469    texFormat = _mesa_get_attachment_teximage_const(att)->TexFormat;
 470
 471    /* If the encoding is sRGB and sRGB rendering cannot be enabled,
 472     * check for linear format support instead.
 473     * Later when we create a surface, we change the format to a linear one. */
 474    if (!ctx->Extensions.EXT_framebuffer_sRGB &&
 475        _mesa_get_format_color_encoding(texFormat) == GL_SRGB) {
 476       const gl_format linearFormat = _mesa_get_srgb_format_linear(texFormat);
 477       format = st_mesa_format_to_pipe_format(linearFormat);
 478    }
 479
 480    return screen->is_format_supported(screen, format,
 481                                       PIPE_TEXTURE_2D,
 482                                       stObj->pt->nr_samples, bindings);
 483 }
 484
 485
 486 /**
 487  * Check if two renderbuffer attachments name a combined depth/stencil
 488  * renderbuffer.
 489  */
 490 GLboolean
 491 st_is_depth_stencil_combined(const struct gl_renderbuffer_attachment *depth,
 492                              const struct gl_renderbuffer_attachment *stencil)
 493 {
 494    assert(depth && stencil);
 495
 496    if (depth->Type == stencil->Type) {
 497       if (depth->Type == GL_RENDERBUFFER_EXT &&
 498           depth->Renderbuffer == stencil->Renderbuffer)
 499          return GL_TRUE;
 500
 501       if (depth->Type == GL_TEXTURE &&
 502           depth->Texture == stencil->Texture)
 503          return GL_TRUE;
 504    }
 505
 506    return GL_FALSE;
 507 }
 508
 509
 510 /**
 511  * Check that the framebuffer configuration is valid in terms of what
 512  * the driver can support.
 513  *
 514  * For Gallium we only supports combined Z+stencil, not separate buffers.
 515  */
 516 static void
 517 st_validate_framebuffer(struct gl_context *ctx, struct gl_framebuffer *fb)
 518 {
 519    struct st_context *st = st_context(ctx);
 520    struct pipe_screen *screen = st->pipe->screen;
 521    const struct gl_renderbuffer_attachment *depth =
 522          &fb->Attachment[BUFFER_DEPTH];
 523    const struct gl_renderbuffer_attachment *stencil =
 524          &fb->Attachment[BUFFER_STENCIL];
 525    GLuint i;
 526    enum pipe_format first_format = PIPE_FORMAT_NONE;
 527    boolean mixed_formats =
 528          screen->get_param(screen, PIPE_CAP_MIXED_COLORBUFFER_FORMATS) != 0;
 529
 530    if (depth->Type && stencil->Type && depth->Type != stencil->Type) {
 531       fb->_Status = GL_FRAMEBUFFER_UNSUPPORTED_EXT;
 532       return;
 533    }
 534    if (depth->Type == GL_RENDERBUFFER_EXT &&
 535        stencil->Type == GL_RENDERBUFFER_EXT &&
 536        depth->Renderbuffer != stencil->Renderbuffer) {
 537       fb->_Status = GL_FRAMEBUFFER_UNSUPPORTED_EXT;
 538       return;
 539    }
 540    if (depth->Type == GL_TEXTURE &&
 541        stencil->Type == GL_TEXTURE &&
 542        depth->Texture != stencil->Texture) {
 543       fb->_Status = GL_FRAMEBUFFER_UNSUPPORTED_EXT;
 544       return;
 545    }
 546
 547    if (!st_validate_attachment(ctx,
 548                                screen,
 549                                depth,
 550                                PIPE_BIND_DEPTH_STENCIL)) {
 551       fb->_Status = GL_FRAMEBUFFER_UNSUPPORTED_EXT;
 552       return;
 553    }
 554    if (!st_validate_attachment(ctx,
 555                                screen,
 556                                stencil,
 557                                PIPE_BIND_DEPTH_STENCIL)) {
 558       fb->_Status = GL_FRAMEBUFFER_UNSUPPORTED_EXT;
 559       return;
 560    }
 561    for (i = 0; i < ctx->Const.MaxColorAttachments; i++) {
 562       struct gl_renderbuffer_attachment *att =
 563             &fb->Attachment[BUFFER_COLOR0 + i];
 564       enum pipe_format format;
 565
 566       if (!st_validate_attachment(ctx,
 567                                   screen,
 568                                   att,
 569                                   PIPE_BIND_RENDER_TARGET)) {
 570          fb->_Status = GL_FRAMEBUFFER_UNSUPPORTED_EXT;
 571          return;
 572       }
 573
 574       if (!mixed_formats) {
 575          /* Disallow mixed formats. */
 576          if (att->Type != GL_NONE) {
 577             format = st_renderbuffer(att->Renderbuffer)->surface->format;
 578          } else {
 579             continue;
 580          }
 581
 582          if (first_format == PIPE_FORMAT_NONE) {
 583             first_format = format;
 584          } else if (format != first_format) {
 585             fb->_Status = GL_FRAMEBUFFER_UNSUPPORTED_EXT;
 586             return;
 587          }
 588       }
 589    }
 590 }
 591
 592
 593 /**
 594  * Called via glDrawBuffer.
 595  */
 596 static void
 597 st_DrawBuffers(struct gl_context *ctx, GLsizei count, const GLenum *buffers)
 598 {
 599    struct st_context *st = st_context(ctx);
 600    struct gl_framebuffer *fb = ctx->DrawBuffer;
 601    GLuint i;
 602
 603    (void) count;
 604    (void) buffers;
 605
 606    /* add the renderbuffers on demand */
 607    for (i = 0; i < fb->_NumColorDrawBuffers; i++) {
 608       gl_buffer_index idx = fb->_ColorDrawBufferIndexes[i];
 609       st_manager_add_color_renderbuffer(st, fb, idx);
 610    }
 611 }
 612
 613
 614 /**
 615  * Called via glReadBuffer.
 616  */
 617 static void
 618 st_ReadBuffer(struct gl_context *ctx, GLenum buffer)
 619 {
 620    struct st_context *st = st_context(ctx);
 621    struct gl_framebuffer *fb = ctx->ReadBuffer;
 622
 623    (void) buffer;
 624
 625    /* add the renderbuffer on demand */
 626    st_manager_add_color_renderbuffer(st, fb, fb->_ColorReadBufferIndex);
 627 }
 628
 629
 630
 631 /**
 632  * Called via ctx->Driver.MapRenderbuffer.
 633  */
 634 static void
 635 st_MapRenderbuffer(struct gl_context *ctx,
 636                    struct gl_renderbuffer *rb,
 637                    GLuint x, GLuint y, GLuint w, GLuint h,
 638                    GLbitfield mode,
 639                    GLubyte **mapOut, GLint *rowStrideOut)
 640 {
 641    struct st_context *st = st_context(ctx);
 642    struct st_renderbuffer *strb = st_renderbuffer(rb);
 643    struct pipe_context *pipe = st->pipe;
 644    const GLboolean invert = rb->Name == 0;
 645    unsigned usage;
 646    GLuint y2;
 647
 648    if (strb->software) {
 649       /* software-allocated renderbuffer (probably an accum buffer) */
 650       GLubyte *map = (GLubyte *) strb->data;
 651       if (strb->data) {
 652          map += strb->stride * y;
 653          map += util_format_get_blocksize(strb->format) * x;
 654          *mapOut = map;
 655          *rowStrideOut = strb->stride;
 656       }
 657       else {
 658          *mapOut = NULL;
 659          *rowStrideOut = 0;
 660       }
 661       return;
 662    }
 663
 664    usage = 0x0;
 665    if (mode & GL_MAP_READ_BIT)
 666       usage |= PIPE_TRANSFER_READ;
 667    if (mode & GL_MAP_WRITE_BIT)
 668       usage |= PIPE_TRANSFER_WRITE;
 669    if (mode & GL_MAP_INVALIDATE_RANGE_BIT)
 670       usage |= PIPE_TRANSFER_DISCARD_RANGE;
 671
 672    /* Note: y=0=bottom of buffer while y2=0=top of buffer.
 673     * 'invert' will be true for window-system buffers and false for
 674     * user-allocated renderbuffers and textures.
 675     */
 676    if (invert)
 677       y2 = strb->Base.Height - y - h;
 678    else
 679       y2 = y;
 680
 681    strb->transfer = pipe_get_transfer(pipe,
 682                                       strb->texture,
 683                                       strb->rtt_level,
 684                                       strb->rtt_face + strb->rtt_slice,
 685                                       usage, x, y2, w, h);
 686    if (strb->transfer) {
 687       GLubyte *map = pipe_transfer_map(pipe, strb->transfer);
 688       if (invert) {
 689          *rowStrideOut = -strb->transfer->stride;
 690          map += (h - 1) * strb->transfer->stride;
 691       }
 692       else {
 693          *rowStrideOut = strb->transfer->stride;
 694       }
 695       *mapOut = map;
 696    }
 697    else {
 698       *mapOut = NULL;
 699       *rowStrideOut = 0;
 700    }
 701 }
 702
 703
 704 /**
 705  * Called via ctx->Driver.UnmapRenderbuffer.
 706  */
 707 static void
 708 st_UnmapRenderbuffer(struct gl_context *ctx,
 709                      struct gl_renderbuffer *rb)
 710 {
 711    struct st_context *st = st_context(ctx);
 712    struct st_renderbuffer *strb = st_renderbuffer(rb);
 713    struct pipe_context *pipe = st->pipe;
 714
 715    if (strb->software) {
 716       /* software-allocated renderbuffer (probably an accum buffer) */
 717       return;
 718    }
 719
 720    pipe_transfer_unmap(pipe, strb->transfer);
 721    pipe->transfer_destroy(pipe, strb->transfer);
 722    strb->transfer = NULL;
 723 }
 724
 725
 726
 727 void st_init_fbo_functions(struct dd_function_table *functions)
 728 {
 729 #if FEATURE_EXT_framebuffer_object
 730    functions->NewFramebuffer = st_new_framebuffer;
 731    functions->NewRenderbuffer = st_new_renderbuffer;
 732    functions->BindFramebuffer = st_bind_framebuffer;
 733    functions->FramebufferRenderbuffer = st_framebuffer_renderbuffer;
 734    functions->RenderTexture = st_render_texture;
 735    functions->FinishRenderTexture = st_finish_render_texture;
 736    functions->ValidateFramebuffer = st_validate_framebuffer;
 737 #endif
 738    /* no longer needed by core Mesa, drivers handle resizes...
 739    functions->ResizeBuffers = st_resize_buffers;
 740    */
 741
 742    functions->DrawBuffers = st_DrawBuffers;
 743    functions->ReadBuffer = st_ReadBuffer;
 744
 745    functions->MapRenderbuffer = st_MapRenderbuffer;
 746    functions->UnmapRenderbuffer = st_UnmapRenderbuffer;
 747 }
 748
 749