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  * gl_renderbuffer::GetPointer()
 189  */
 190 static void *
 191 null_get_pointer(struct gl_context * ctx, struct gl_renderbuffer *rb,
 192                  GLint x, GLint y)
 193 {
 194    /* By returning NULL we force all software rendering to go through
 195     * the span routines.
 196     */
 197 #if 0
 198    assert(0);  /* Should never get called with softpipe */
 199 #endif
 200    return NULL;
 201 }
 202
 203
 204 /**
 205  * Called via ctx->Driver.NewFramebuffer()
 206  */
 207 static struct gl_framebuffer *
 208 st_new_framebuffer(struct gl_context *ctx, GLuint name)
 209 {
 210    /* XXX not sure we need to subclass gl_framebuffer for pipe */
 211    return _mesa_new_framebuffer(ctx, name);
 212 }
 213
 214
 215 /**
 216  * Called via ctx->Driver.NewRenderbuffer()
 217  */
 218 static struct gl_renderbuffer *
 219 st_new_renderbuffer(struct gl_context *ctx, GLuint name)
 220 {
 221    struct st_renderbuffer *strb = ST_CALLOC_STRUCT(st_renderbuffer);
 222    if (strb) {
 223       _mesa_init_renderbuffer(&strb->Base, name);
 224       strb->Base.Delete = st_renderbuffer_delete;
 225       strb->Base.AllocStorage = st_renderbuffer_alloc_storage;
 226       strb->Base.GetPointer = null_get_pointer;
 227       strb->format = PIPE_FORMAT_NONE;
 228       return &strb->Base;
 229    }
 230    return NULL;
 231 }
 232
 233
 234 /**
 235  * Allocate a renderbuffer for a an on-screen window (not a user-created
 236  * renderbuffer).  The window system code determines the format.
 237  */
 238 struct gl_renderbuffer *
 239 st_new_renderbuffer_fb(enum pipe_format format, int samples, boolean sw)
 240 {
 241    struct st_renderbuffer *strb;
 242
 243    strb = ST_CALLOC_STRUCT(st_renderbuffer);
 244    if (!strb) {
 245       _mesa_error(NULL, GL_OUT_OF_MEMORY, "creating renderbuffer");
 246       return NULL;
 247    }
 248
 249    _mesa_init_renderbuffer(&strb->Base, 0);
 250    strb->Base.ClassID = 0x4242; /* just a unique value */
 251    strb->Base.NumSamples = samples;
 252    strb->Base.Format = st_pipe_format_to_mesa_format(format);
 253    strb->Base._BaseFormat = _mesa_get_format_base_format(strb->Base.Format);
 254    strb->format = format;
 255    strb->software = sw;
 256
 257    switch (format) {
 258    case PIPE_FORMAT_R8G8B8A8_UNORM:
 259    case PIPE_FORMAT_B8G8R8A8_UNORM:
 260    case PIPE_FORMAT_A8R8G8B8_UNORM:
 261    case PIPE_FORMAT_R8G8B8X8_UNORM:
 262    case PIPE_FORMAT_B8G8R8X8_UNORM:
 263    case PIPE_FORMAT_X8R8G8B8_UNORM:
 264    case PIPE_FORMAT_B5G5R5A1_UNORM:
 265    case PIPE_FORMAT_B4G4R4A4_UNORM:
 266    case PIPE_FORMAT_B5G6R5_UNORM:
 267       strb->Base.InternalFormat = GL_RGBA;
 268       break;
 269    case PIPE_FORMAT_Z16_UNORM:
 270       strb->Base.InternalFormat = GL_DEPTH_COMPONENT16;
 271       break;
 272    case PIPE_FORMAT_Z32_UNORM:
 273       strb->Base.InternalFormat = GL_DEPTH_COMPONENT32;
 274       break;
 275    case PIPE_FORMAT_Z24_UNORM_S8_UINT:
 276    case PIPE_FORMAT_S8_UINT_Z24_UNORM:
 277    case PIPE_FORMAT_Z24X8_UNORM:
 278    case PIPE_FORMAT_X8Z24_UNORM:
 279       strb->Base.InternalFormat = GL_DEPTH24_STENCIL8_EXT;
 280       break;
 281    case PIPE_FORMAT_S8_UINT:
 282       strb->Base.InternalFormat = GL_STENCIL_INDEX8_EXT;
 283       break;
 284    case PIPE_FORMAT_R16G16B16A16_SNORM:
 285       /* accum buffer */
 286       strb->Base.InternalFormat = GL_RGBA16_SNORM;
 287       break;
 288    case PIPE_FORMAT_R8_UNORM:
 289       strb->Base.InternalFormat = GL_R8;
 290       break;
 291    case PIPE_FORMAT_R8G8_UNORM:
 292       strb->Base.InternalFormat = GL_RG8;
 293       break;
 294    case PIPE_FORMAT_R16_UNORM:
 295       strb->Base.InternalFormat = GL_R16;
 296       break;
 297    case PIPE_FORMAT_R16G16_UNORM:
 298       strb->Base.InternalFormat = GL_RG16;
 299       break;
 300    default:
 301       _mesa_problem(NULL,
 302                     "Unexpected format in st_new_renderbuffer_fb");
 303       free(strb);
 304       return NULL;
 305    }
 306
 307    /* st-specific methods */
 308    strb->Base.Delete = st_renderbuffer_delete;
 309    strb->Base.AllocStorage = st_renderbuffer_alloc_storage;
 310    strb->Base.GetPointer = null_get_pointer;
 311
 312    /* surface is allocated in st_renderbuffer_alloc_storage() */
 313    strb->surface = NULL;
 314
 315    return &strb->Base;
 316 }
 317
 318
 319
 320
 321 /**
 322  * Called via ctx->Driver.BindFramebufferEXT().
 323  */
 324 static void
 325 st_bind_framebuffer(struct gl_context *ctx, GLenum target,
 326                     struct gl_framebuffer *fb, struct gl_framebuffer *fbread)
 327 {
 328
 329 }
 330
 331 /**
 332  * Called by ctx->Driver.FramebufferRenderbuffer
 333  */
 334 static void
 335 st_framebuffer_renderbuffer(struct gl_context *ctx,
 336                             struct gl_framebuffer *fb,
 337                             GLenum attachment,
 338                             struct gl_renderbuffer *rb)
 339 {
 340    /* XXX no need for derivation? */
 341    _mesa_framebuffer_renderbuffer(ctx, fb, attachment, rb);
 342 }
 343
 344
 345 /**
 346  * Called by ctx->Driver.RenderTexture
 347  */
 348 static void
 349 st_render_texture(struct gl_context *ctx,
 350                   struct gl_framebuffer *fb,
 351                   struct gl_renderbuffer_attachment *att)
 352 {
 353    struct st_context *st = st_context(ctx);
 354    struct pipe_context *pipe = st->pipe;
 355    struct st_renderbuffer *strb;
 356    struct gl_renderbuffer *rb;
 357    struct pipe_resource *pt;
 358    struct st_texture_object *stObj;
 359    const struct gl_texture_image *texImage;
 360    struct pipe_surface surf_tmpl;
 361
 362    if (!st_finalize_texture(ctx, pipe, att->Texture))
 363       return;
 364
 365    pt = st_get_texobj_resource(att->Texture);
 366    assert(pt);
 367
 368    /* get pointer to texture image we're rendeing to */
 369    texImage = _mesa_get_attachment_teximage(att);
 370
 371    /* create new renderbuffer which wraps the texture image.
 372     * Use the texture's name as the renderbuffer's name so that we have
 373     * something that's non-zero (to determine vertical orientation) and
 374     * possibly helpful for debugging.
 375     */
 376    rb = st_new_renderbuffer(ctx, att->Texture->Name);
 377    if (!rb) {
 378       _mesa_error(ctx, GL_OUT_OF_MEMORY, "glFramebufferTexture()");
 379       return;
 380    }
 381
 382    _mesa_reference_renderbuffer(&att->Renderbuffer, rb);
 383    assert(rb->RefCount == 1);
 384    rb->AllocStorage = NULL; /* should not get called */
 385    strb = st_renderbuffer(rb);
 386
 387    assert(strb->Base.RefCount > 0);
 388
 389    /* get the texture for the texture object */
 390    stObj = st_texture_object(att->Texture);
 391
 392    /* point renderbuffer at texobject */
 393    strb->rtt = stObj;
 394    strb->rtt_level = att->TextureLevel;
 395    strb->rtt_face = att->CubeMapFace;
 396    strb->rtt_slice = att->Zoffset;
 397
 398    rb->Width = texImage->Width2;
 399    rb->Height = texImage->Height2;
 400    rb->_BaseFormat = texImage->_BaseFormat;
 401    rb->InternalFormat = texImage->InternalFormat;
 402    /*printf("***** render to texture level %d: %d x %d\n", att->TextureLevel, rb->Width, rb->Height);*/
 403
 404    /*printf("***** pipe texture %d x %d\n", pt->width0, pt->height0);*/
 405
 406    pipe_resource_reference( &strb->texture, pt );
 407
 408    pipe_surface_reference(&strb->surface, NULL);
 409
 410    assert(strb->rtt_level <= strb->texture->last_level);
 411
 412    /* new surface for rendering into the texture */
 413    memset(&surf_tmpl, 0, sizeof(surf_tmpl));
 414    surf_tmpl.format = ctx->Color.sRGBEnabled ? strb->texture->format : util_format_linear(strb->texture->format);
 415    surf_tmpl.usage = PIPE_BIND_RENDER_TARGET;
 416    surf_tmpl.u.tex.level = strb->rtt_level;
 417    surf_tmpl.u.tex.first_layer = strb->rtt_face + strb->rtt_slice;
 418    surf_tmpl.u.tex.last_layer = strb->rtt_face + strb->rtt_slice;
 419    strb->surface = pipe->create_surface(pipe,
 420                                         strb->texture,
 421                                         &surf_tmpl);
 422
 423    strb->format = pt->format;
 424
 425    strb->Base.Format = st_pipe_format_to_mesa_format(pt->format);
 426
 427    /*
 428    printf("RENDER TO TEXTURE obj=%p pt=%p surf=%p  %d x %d\n",
 429           att->Texture, pt, strb->surface, rb->Width, rb->Height);
 430    */
 431
 432    /* Invalidate buffer state so that the pipe's framebuffer state
 433     * gets updated.
 434     * That's where the new renderbuffer (which we just created) gets
 435     * passed to the pipe as a (color/depth) render target.
 436     */
 437    st_invalidate_state(ctx, _NEW_BUFFERS);
 438 }
 439
 440
 441 /**
 442  * Called via ctx->Driver.FinishRenderTexture.
 443  */
 444 static void
 445 st_finish_render_texture(struct gl_context *ctx,
 446                          struct gl_renderbuffer_attachment *att)
 447 {
 448    struct st_renderbuffer *strb = st_renderbuffer(att->Renderbuffer);
 449
 450    if (!strb)
 451       return;
 452
 453    strb->rtt = NULL;
 454
 455    /*
 456    printf("FINISH RENDER TO TEXTURE surf=%p\n", strb->surface);
 457    */
 458
 459    /* restore previous framebuffer state */
 460    st_invalidate_state(ctx, _NEW_BUFFERS);
 461 }
 462
 463
 464 /**
 465  * Validate a renderbuffer attachment for a particular set of bindings.
 466  */
 467 static GLboolean
 468 st_validate_attachment(struct gl_context *ctx,
 469                        struct pipe_screen *screen,
 470                        const struct gl_renderbuffer_attachment *att,
 471                        unsigned bindings)
 472 {
 473    const struct st_texture_object *stObj = st_texture_object(att->Texture);
 474    enum pipe_format format;
 475    gl_format texFormat;
 476
 477    /* Only validate texture attachments for now, since
 478     * st_renderbuffer_alloc_storage makes sure that
 479     * the format is supported.
 480     */
 481    if (att->Type != GL_TEXTURE)
 482       return GL_TRUE;
 483
 484    if (!stObj)
 485       return GL_FALSE;
 486
 487    format = stObj->pt->format;
 488    texFormat = _mesa_get_attachment_teximage_const(att)->TexFormat;
 489
 490    /* If the encoding is sRGB and sRGB rendering cannot be enabled,
 491     * check for linear format support instead.
 492     * Later when we create a surface, we change the format to a linear one. */
 493    if (!ctx->Const.sRGBCapable &&
 494        _mesa_get_format_color_encoding(texFormat) == GL_SRGB) {
 495       const gl_format linearFormat = _mesa_get_srgb_format_linear(texFormat);
 496       format = st_mesa_format_to_pipe_format(linearFormat);
 497    }
 498
 499    return screen->is_format_supported(screen, format,
 500                                       PIPE_TEXTURE_2D,
 501                                       stObj->pt->nr_samples, bindings);
 502 }
 503
 504
 505 /**
 506  * Check if two renderbuffer attachments name a combined depth/stencil
 507  * renderbuffer.
 508  */
 509 GLboolean
 510 st_is_depth_stencil_combined(const struct gl_renderbuffer_attachment *depth,
 511                              const struct gl_renderbuffer_attachment *stencil)
 512 {
 513    assert(depth && stencil);
 514
 515    if (depth->Type == stencil->Type) {
 516       if (depth->Type == GL_RENDERBUFFER_EXT &&
 517           depth->Renderbuffer == stencil->Renderbuffer)
 518          return GL_TRUE;
 519
 520       if (depth->Type == GL_TEXTURE &&
 521           depth->Texture == stencil->Texture)
 522          return GL_TRUE;
 523    }
 524
 525    return GL_FALSE;
 526 }
 527
 528
 529 /**
 530  * Check that the framebuffer configuration is valid in terms of what
 531  * the driver can support.
 532  *
 533  * For Gallium we only supports combined Z+stencil, not separate buffers.
 534  */
 535 static void
 536 st_validate_framebuffer(struct gl_context *ctx, struct gl_framebuffer *fb)
 537 {
 538    struct st_context *st = st_context(ctx);
 539    struct pipe_screen *screen = st->pipe->screen;
 540    const struct gl_renderbuffer_attachment *depth =
 541          &fb->Attachment[BUFFER_DEPTH];
 542    const struct gl_renderbuffer_attachment *stencil =
 543          &fb->Attachment[BUFFER_STENCIL];
 544    GLuint i;
 545    enum pipe_format first_format = PIPE_FORMAT_NONE;
 546    boolean mixed_formats =
 547          screen->get_param(screen, PIPE_CAP_MIXED_COLORBUFFER_FORMATS) != 0;
 548
 549    if (depth->Type && stencil->Type && depth->Type != stencil->Type) {
 550       fb->_Status = GL_FRAMEBUFFER_UNSUPPORTED_EXT;
 551       return;
 552    }
 553    if (depth->Type == GL_RENDERBUFFER_EXT &&
 554        stencil->Type == GL_RENDERBUFFER_EXT &&
 555        depth->Renderbuffer != stencil->Renderbuffer) {
 556       fb->_Status = GL_FRAMEBUFFER_UNSUPPORTED_EXT;
 557       return;
 558    }
 559    if (depth->Type == GL_TEXTURE &&
 560        stencil->Type == GL_TEXTURE &&
 561        depth->Texture != stencil->Texture) {
 562       fb->_Status = GL_FRAMEBUFFER_UNSUPPORTED_EXT;
 563       return;
 564    }
 565
 566    if (!st_validate_attachment(ctx,
 567                                screen,
 568                                depth,
 569                                PIPE_BIND_DEPTH_STENCIL)) {
 570       fb->_Status = GL_FRAMEBUFFER_UNSUPPORTED_EXT;
 571       return;
 572    }
 573    if (!st_validate_attachment(ctx,
 574                                screen,
 575                                stencil,
 576                                PIPE_BIND_DEPTH_STENCIL)) {
 577       fb->_Status = GL_FRAMEBUFFER_UNSUPPORTED_EXT;
 578       return;
 579    }
 580    for (i = 0; i < ctx->Const.MaxColorAttachments; i++) {
 581       struct gl_renderbuffer_attachment *att =
 582             &fb->Attachment[BUFFER_COLOR0 + i];
 583       enum pipe_format format;
 584
 585       if (!st_validate_attachment(ctx,
 586                                   screen,
 587                                   att,
 588                                   PIPE_BIND_RENDER_TARGET)) {
 589          fb->_Status = GL_FRAMEBUFFER_UNSUPPORTED_EXT;
 590          return;
 591       }
 592
 593       if (!mixed_formats) {
 594          /* Disallow mixed formats. */
 595          if (att->Type != GL_NONE) {
 596             format = st_renderbuffer(att->Renderbuffer)->surface->format;
 597          } else {
 598             continue;
 599          }
 600
 601          if (first_format == PIPE_FORMAT_NONE) {
 602             first_format = format;
 603          } else if (format != first_format) {
 604             fb->_Status = GL_FRAMEBUFFER_UNSUPPORTED_EXT;
 605             return;
 606          }
 607       }
 608    }
 609 }
 610
 611
 612 /**
 613  * Called via glDrawBuffer.
 614  */
 615 static void
 616 st_DrawBuffers(struct gl_context *ctx, GLsizei count, const GLenum *buffers)
 617 {
 618    struct st_context *st = st_context(ctx);
 619    struct gl_framebuffer *fb = ctx->DrawBuffer;
 620    GLuint i;
 621
 622    (void) count;
 623    (void) buffers;
 624
 625    /* add the renderbuffers on demand */
 626    for (i = 0; i < fb->_NumColorDrawBuffers; i++) {
 627       gl_buffer_index idx = fb->_ColorDrawBufferIndexes[i];
 628       st_manager_add_color_renderbuffer(st, fb, idx);
 629    }
 630 }
 631
 632
 633 /**
 634  * Called via glReadBuffer.
 635  */
 636 static void
 637 st_ReadBuffer(struct gl_context *ctx, GLenum buffer)
 638 {
 639    struct st_context *st = st_context(ctx);
 640    struct gl_framebuffer *fb = ctx->ReadBuffer;
 641
 642    (void) buffer;
 643
 644    /* add the renderbuffer on demand */
 645    st_manager_add_color_renderbuffer(st, fb, fb->_ColorReadBufferIndex);
 646 }
 647
 648
 649
 650 /**
 651  * Called via ctx->Driver.MapRenderbuffer.
 652  */
 653 static void
 654 st_MapRenderbuffer(struct gl_context *ctx,
 655                    struct gl_renderbuffer *rb,
 656                    GLuint x, GLuint y, GLuint w, GLuint h,
 657                    GLbitfield mode,
 658                    GLubyte **mapOut, GLint *rowStrideOut)
 659 {
 660    struct st_context *st = st_context(ctx);
 661    struct st_renderbuffer *strb = st_renderbuffer(rb);
 662    struct pipe_context *pipe = st->pipe;
 663    const GLboolean invert = rb->Name == 0;
 664    unsigned usage;
 665    GLuint y2;
 666
 667    if (strb->software) {
 668       /* software-allocated renderbuffer (probably an accum buffer) */
 669       GLubyte *map = (GLubyte *) strb->data;
 670       if (strb->data) {
 671          map += strb->stride * y;
 672          map += util_format_get_blocksize(strb->format) * x;
 673          *mapOut = map;
 674          *rowStrideOut = strb->stride;
 675       }
 676       else {
 677          *mapOut = NULL;
 678          *rowStrideOut = 0;
 679       }
 680       return;
 681    }
 682
 683    usage = 0x0;
 684    if (mode & GL_MAP_READ_BIT)
 685       usage |= PIPE_TRANSFER_READ;
 686    if (mode & GL_MAP_WRITE_BIT)
 687       usage |= PIPE_TRANSFER_WRITE;
 688    if (mode & GL_MAP_INVALIDATE_RANGE_BIT)
 689       usage |= PIPE_TRANSFER_DISCARD_RANGE;
 690
 691    /* Note: y=0=bottom of buffer while y2=0=top of buffer.
 692     * 'invert' will be true for window-system buffers and false for
 693     * user-allocated renderbuffers and textures.
 694     */
 695    if (invert)
 696       y2 = strb->Base.Height - y - h;
 697    else
 698       y2 = y;
 699
 700    strb->transfer = pipe_get_transfer(pipe,
 701                                       strb->texture,
 702                                       strb->rtt_level,
 703                                       strb->rtt_face + strb->rtt_slice,
 704                                       usage, x, y2, w, h);
 705    if (strb->transfer) {
 706       GLubyte *map = pipe_transfer_map(pipe, strb->transfer);
 707       if (invert) {
 708          *rowStrideOut = -strb->transfer->stride;
 709          map += (h - 1) * strb->transfer->stride;
 710       }
 711       else {
 712          *rowStrideOut = strb->transfer->stride;
 713       }
 714       *mapOut = map;
 715    }
 716    else {
 717       *mapOut = NULL;
 718       *rowStrideOut = 0;
 719    }
 720 }
 721
 722
 723 /**
 724  * Called via ctx->Driver.UnmapRenderbuffer.
 725  */
 726 static void
 727 st_UnmapRenderbuffer(struct gl_context *ctx,
 728                      struct gl_renderbuffer *rb)
 729 {
 730    struct st_context *st = st_context(ctx);
 731    struct st_renderbuffer *strb = st_renderbuffer(rb);
 732    struct pipe_context *pipe = st->pipe;
 733
 734    if (strb->software) {
 735       /* software-allocated renderbuffer (probably an accum buffer) */
 736       return;
 737    }
 738
 739    pipe_transfer_unmap(pipe, strb->transfer);
 740    pipe->transfer_destroy(pipe, strb->transfer);
 741    strb->transfer = NULL;
 742 }
 743
 744
 745
 746 void st_init_fbo_functions(struct dd_function_table *functions)
 747 {
 748 #if FEATURE_EXT_framebuffer_object
 749    functions->NewFramebuffer = st_new_framebuffer;
 750    functions->NewRenderbuffer = st_new_renderbuffer;
 751    functions->BindFramebuffer = st_bind_framebuffer;
 752    functions->FramebufferRenderbuffer = st_framebuffer_renderbuffer;
 753    functions->RenderTexture = st_render_texture;
 754    functions->FinishRenderTexture = st_finish_render_texture;
 755    functions->ValidateFramebuffer = st_validate_framebuffer;
 756 #endif
 757    /* no longer needed by core Mesa, drivers handle resizes...
 758    functions->ResizeBuffers = st_resize_buffers;
 759    */
 760
 761    functions->DrawBuffers = st_DrawBuffers;
 762    functions->ReadBuffer = st_ReadBuffer;
 763
 764    functions->MapRenderbuffer = st_MapRenderbuffer;
 765    functions->UnmapRenderbuffer = st_UnmapRenderbuffer;
 766 }
 767
 768