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->Base.DataType = st_format_datatype(format);
 101    strb->format = format;
 102
 103    strb->defined = GL_FALSE;  /* undefined contents now */
 104
 105    if (strb->software) {
 106       size_t size;
 107
 108       free(strb->data);
 109
 110       assert(strb->format != PIPE_FORMAT_NONE);
 111
 112       strb->stride = util_format_get_stride(strb->format, width);
 113       size = util_format_get_2d_size(strb->format, strb->stride, height);
 114
 115       strb->data = malloc(size);
 116
 117       return strb->data != NULL;
 118    }
 119    else {
 120       struct pipe_resource template;
 121
 122       /* Free the old surface and texture
 123        */
 124       pipe_surface_reference( &strb->surface, NULL );
 125       pipe_resource_reference( &strb->texture, NULL );
 126
 127       if (width == 0 || height == 0) {
 128          /* if size is zero, nothing to allocate */
 129          return GL_TRUE;
 130       }
 131
 132       /* Setup new texture template.
 133        */
 134       memset(&template, 0, sizeof(template));
 135       template.target = st->internal_target;
 136       template.format = format;
 137       template.width0 = width;
 138       template.height0 = height;
 139       template.depth0 = 1;
 140       template.array_size = 1;
 141       template.last_level = 0;
 142       template.nr_samples = rb->NumSamples;
 143       if (util_format_is_depth_or_stencil(format)) {
 144          template.bind = PIPE_BIND_DEPTH_STENCIL;
 145       }
 146       else {
 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       memset(&surf_tmpl, 0, sizeof(surf_tmpl));
 157       u_surface_default_template(&surf_tmpl, strb->texture, template.bind);
 158       strb->surface = pipe->create_surface(pipe,
 159                                            strb->texture,
 160                                            &surf_tmpl);
 161       if (strb->surface) {
 162          assert(strb->surface->texture);
 163          assert(strb->surface->format);
 164          assert(strb->surface->width == width);
 165          assert(strb->surface->height == height);
 166       }
 167
 168       return strb->surface != NULL;
 169    }
 170 }
 171
 172
 173 /**
 174  * gl_renderbuffer::Delete()
 175  */
 176 static void
 177 st_renderbuffer_delete(struct gl_renderbuffer *rb)
 178 {
 179    struct st_renderbuffer *strb = st_renderbuffer(rb);
 180    ASSERT(strb);
 181    pipe_surface_reference(&strb->surface, NULL);
 182    pipe_resource_reference(&strb->texture, NULL);
 183    free(strb->data);
 184    free(strb);
 185 }
 186
 187
 188 /**
 189  * gl_renderbuffer::GetPointer()
 190  */
 191 static void *
 192 null_get_pointer(struct gl_context * ctx, struct gl_renderbuffer *rb,
 193                  GLint x, GLint y)
 194 {
 195    /* By returning NULL we force all software rendering to go through
 196     * the span routines.
 197     */
 198 #if 0
 199    assert(0);  /* Should never get called with softpipe */
 200 #endif
 201    return NULL;
 202 }
 203
 204
 205 /**
 206  * Called via ctx->Driver.NewFramebuffer()
 207  */
 208 static struct gl_framebuffer *
 209 st_new_framebuffer(struct gl_context *ctx, GLuint name)
 210 {
 211    /* XXX not sure we need to subclass gl_framebuffer for pipe */
 212    return _mesa_new_framebuffer(ctx, name);
 213 }
 214
 215
 216 /**
 217  * Called via ctx->Driver.NewRenderbuffer()
 218  */
 219 static struct gl_renderbuffer *
 220 st_new_renderbuffer(struct gl_context *ctx, GLuint name)
 221 {
 222    struct st_renderbuffer *strb = ST_CALLOC_STRUCT(st_renderbuffer);
 223    if (strb) {
 224       _mesa_init_renderbuffer(&strb->Base, name);
 225       strb->Base.Delete = st_renderbuffer_delete;
 226       strb->Base.AllocStorage = st_renderbuffer_alloc_storage;
 227       strb->Base.GetPointer = null_get_pointer;
 228       strb->format = PIPE_FORMAT_NONE;
 229       return &strb->Base;
 230    }
 231    return NULL;
 232 }
 233
 234
 235 /**
 236  * Allocate a renderbuffer for a an on-screen window (not a user-created
 237  * renderbuffer).  The window system code determines the format.
 238  */
 239 struct gl_renderbuffer *
 240 st_new_renderbuffer_fb(enum pipe_format format, int samples, boolean sw)
 241 {
 242    struct st_renderbuffer *strb;
 243
 244    strb = ST_CALLOC_STRUCT(st_renderbuffer);
 245    if (!strb) {
 246       _mesa_error(NULL, GL_OUT_OF_MEMORY, "creating renderbuffer");
 247       return NULL;
 248    }
 249
 250    _mesa_init_renderbuffer(&strb->Base, 0);
 251    strb->Base.ClassID = 0x4242; /* just a unique value */
 252    strb->Base.NumSamples = samples;
 253    strb->Base.Format = st_pipe_format_to_mesa_format(format);
 254    strb->Base._BaseFormat = _mesa_get_format_base_format(strb->Base.Format);
 255    strb->Base.DataType = st_format_datatype(format);
 256    strb->format = format;
 257    strb->software = sw;
 258
 259    switch (format) {
 260    case PIPE_FORMAT_R8G8B8A8_UNORM:
 261    case PIPE_FORMAT_B8G8R8A8_UNORM:
 262    case PIPE_FORMAT_A8R8G8B8_UNORM:
 263    case PIPE_FORMAT_R8G8B8X8_UNORM:
 264    case PIPE_FORMAT_B8G8R8X8_UNORM:
 265    case PIPE_FORMAT_X8R8G8B8_UNORM:
 266    case PIPE_FORMAT_B5G5R5A1_UNORM:
 267    case PIPE_FORMAT_B4G4R4A4_UNORM:
 268    case PIPE_FORMAT_B5G6R5_UNORM:
 269       strb->Base.InternalFormat = GL_RGBA;
 270       break;
 271    case PIPE_FORMAT_Z16_UNORM:
 272       strb->Base.InternalFormat = GL_DEPTH_COMPONENT16;
 273       break;
 274    case PIPE_FORMAT_Z32_UNORM:
 275       strb->Base.InternalFormat = GL_DEPTH_COMPONENT32;
 276       break;
 277    case PIPE_FORMAT_Z24_UNORM_S8_UINT:
 278    case PIPE_FORMAT_S8_UINT_Z24_UNORM:
 279    case PIPE_FORMAT_Z24X8_UNORM:
 280    case PIPE_FORMAT_X8Z24_UNORM:
 281       strb->Base.InternalFormat = GL_DEPTH24_STENCIL8_EXT;
 282       break;
 283    case PIPE_FORMAT_S8_UINT:
 284       strb->Base.InternalFormat = GL_STENCIL_INDEX8_EXT;
 285       break;
 286    case PIPE_FORMAT_R16G16B16A16_SNORM:
 287       /* accum buffer */
 288       strb->Base.InternalFormat = GL_RGBA16_SNORM;
 289       break;
 290    case PIPE_FORMAT_R8_UNORM:
 291       strb->Base.InternalFormat = GL_R8;
 292       break;
 293    case PIPE_FORMAT_R8G8_UNORM:
 294       strb->Base.InternalFormat = GL_RG8;
 295       break;
 296    case PIPE_FORMAT_R16_UNORM:
 297       strb->Base.InternalFormat = GL_R16;
 298       break;
 299    case PIPE_FORMAT_R16G16_UNORM:
 300       strb->Base.InternalFormat = GL_RG16;
 301       break;
 302    default:
 303       _mesa_problem(NULL,
 304                     "Unexpected format in st_new_renderbuffer_fb");
 305       free(strb);
 306       return NULL;
 307    }
 308
 309    /* st-specific methods */
 310    strb->Base.Delete = st_renderbuffer_delete;
 311    strb->Base.AllocStorage = st_renderbuffer_alloc_storage;
 312    strb->Base.GetPointer = null_get_pointer;
 313
 314    /* surface is allocated in st_renderbuffer_alloc_storage() */
 315    strb->surface = NULL;
 316
 317    return &strb->Base;
 318 }
 319
 320
 321
 322
 323 /**
 324  * Called via ctx->Driver.BindFramebufferEXT().
 325  */
 326 static void
 327 st_bind_framebuffer(struct gl_context *ctx, GLenum target,
 328                     struct gl_framebuffer *fb, struct gl_framebuffer *fbread)
 329 {
 330
 331 }
 332
 333 /**
 334  * Called by ctx->Driver.FramebufferRenderbuffer
 335  */
 336 static void
 337 st_framebuffer_renderbuffer(struct gl_context *ctx,
 338                             struct gl_framebuffer *fb,
 339                             GLenum attachment,
 340                             struct gl_renderbuffer *rb)
 341 {
 342    /* XXX no need for derivation? */
 343    _mesa_framebuffer_renderbuffer(ctx, fb, attachment, rb);
 344 }
 345
 346
 347 /**
 348  * Called by ctx->Driver.RenderTexture
 349  */
 350 static void
 351 st_render_texture(struct gl_context *ctx,
 352                   struct gl_framebuffer *fb,
 353                   struct gl_renderbuffer_attachment *att)
 354 {
 355    struct st_context *st = st_context(ctx);
 356    struct pipe_context *pipe = st->pipe;
 357    struct st_renderbuffer *strb;
 358    struct gl_renderbuffer *rb;
 359    struct pipe_resource *pt;
 360    struct st_texture_object *stObj;
 361    const struct gl_texture_image *texImage;
 362    struct pipe_surface surf_tmpl;
 363
 364    if (!st_finalize_texture(ctx, pipe, att->Texture))
 365       return;
 366
 367    pt = st_get_texobj_resource(att->Texture);
 368    assert(pt);
 369
 370    /* get pointer to texture image we're rendeing to */
 371    texImage = _mesa_get_attachment_teximage(att);
 372
 373    /* create new renderbuffer which wraps the texture image.
 374     * Use the texture's name as the renderbuffer's name so that we have
 375     * something that's non-zero (to determine vertical orientation) and
 376     * possibly helpful for debugging.
 377     */
 378    rb = st_new_renderbuffer(ctx, att->Texture->Name);
 379    if (!rb) {
 380       _mesa_error(ctx, GL_OUT_OF_MEMORY, "glFramebufferTexture()");
 381       return;
 382    }
 383
 384    _mesa_reference_renderbuffer(&att->Renderbuffer, rb);
 385    assert(rb->RefCount == 1);
 386    rb->AllocStorage = NULL; /* should not get called */
 387    strb = st_renderbuffer(rb);
 388
 389    assert(strb->Base.RefCount > 0);
 390
 391    /* get the texture for the texture object */
 392    stObj = st_texture_object(att->Texture);
 393
 394    /* point renderbuffer at texobject */
 395    strb->rtt = stObj;
 396    strb->rtt_level = att->TextureLevel;
 397    strb->rtt_face = att->CubeMapFace;
 398    strb->rtt_slice = att->Zoffset;
 399
 400    rb->Width = texImage->Width2;
 401    rb->Height = texImage->Height2;
 402    rb->_BaseFormat = texImage->_BaseFormat;
 403    rb->InternalFormat = texImage->InternalFormat;
 404    /*printf("***** render to texture level %d: %d x %d\n", att->TextureLevel, rb->Width, rb->Height);*/
 405
 406    /*printf("***** pipe texture %d x %d\n", pt->width0, pt->height0);*/
 407
 408    pipe_resource_reference( &strb->texture, pt );
 409
 410    pipe_surface_reference(&strb->surface, NULL);
 411
 412    assert(strb->rtt_level <= strb->texture->last_level);
 413
 414    /* new surface for rendering into the texture */
 415    memset(&surf_tmpl, 0, sizeof(surf_tmpl));
 416    surf_tmpl.format = ctx->Color.sRGBEnabled ? strb->texture->format : util_format_linear(strb->texture->format);
 417    surf_tmpl.usage = PIPE_BIND_RENDER_TARGET;
 418    surf_tmpl.u.tex.level = strb->rtt_level;
 419    surf_tmpl.u.tex.first_layer = strb->rtt_face + strb->rtt_slice;
 420    surf_tmpl.u.tex.last_layer = strb->rtt_face + strb->rtt_slice;
 421    strb->surface = pipe->create_surface(pipe,
 422                                         strb->texture,
 423                                         &surf_tmpl);
 424
 425    strb->format = pt->format;
 426
 427    strb->Base.Format = st_pipe_format_to_mesa_format(pt->format);
 428    strb->Base.DataType = st_format_datatype(pt->format);
 429
 430    /*
 431    printf("RENDER TO TEXTURE obj=%p pt=%p surf=%p  %d x %d\n",
 432           att->Texture, pt, strb->surface, rb->Width, rb->Height);
 433    */
 434
 435    /* Invalidate buffer state so that the pipe's framebuffer state
 436     * gets updated.
 437     * That's where the new renderbuffer (which we just created) gets
 438     * passed to the pipe as a (color/depth) render target.
 439     */
 440    st_invalidate_state(ctx, _NEW_BUFFERS);
 441 }
 442
 443
 444 /**
 445  * Called via ctx->Driver.FinishRenderTexture.
 446  */
 447 static void
 448 st_finish_render_texture(struct gl_context *ctx,
 449                          struct gl_renderbuffer_attachment *att)
 450 {
 451    struct st_renderbuffer *strb = st_renderbuffer(att->Renderbuffer);
 452
 453    if (!strb)
 454       return;
 455
 456    strb->rtt = NULL;
 457
 458    /*
 459    printf("FINISH RENDER TO TEXTURE surf=%p\n", strb->surface);
 460    */
 461
 462    /* restore previous framebuffer state */
 463    st_invalidate_state(ctx, _NEW_BUFFERS);
 464 }
 465
 466
 467 /**
 468  * Validate a renderbuffer attachment for a particular set of bindings.
 469  */
 470 static GLboolean
 471 st_validate_attachment(struct gl_context *ctx,
 472                        struct pipe_screen *screen,
 473                        const struct gl_renderbuffer_attachment *att,
 474                        unsigned bindings)
 475 {
 476    const struct st_texture_object *stObj = st_texture_object(att->Texture);
 477    enum pipe_format format;
 478    gl_format texFormat;
 479
 480    /* Only validate texture attachments for now, since
 481     * st_renderbuffer_alloc_storage makes sure that
 482     * the format is supported.
 483     */
 484    if (att->Type != GL_TEXTURE)
 485       return GL_TRUE;
 486
 487    if (!stObj)
 488       return GL_FALSE;
 489
 490    format = stObj->pt->format;
 491    texFormat = _mesa_get_attachment_teximage_const(att)->TexFormat;
 492
 493    /* If the encoding is sRGB and sRGB rendering cannot be enabled,
 494     * check for linear format support instead.
 495     * Later when we create a surface, we change the format to a linear one. */
 496    if (!ctx->Const.sRGBCapable &&
 497        _mesa_get_format_color_encoding(texFormat) == GL_SRGB) {
 498       const gl_format linearFormat = _mesa_get_srgb_format_linear(texFormat);
 499       format = st_mesa_format_to_pipe_format(linearFormat);
 500    }
 501
 502    return screen->is_format_supported(screen, format,
 503                                       PIPE_TEXTURE_2D,
 504                                       stObj->pt->nr_samples, bindings);
 505 }
 506
 507
 508 /**
 509  * Check if two renderbuffer attachments name a combined depth/stencil
 510  * renderbuffer.
 511  */
 512 GLboolean
 513 st_is_depth_stencil_combined(const struct gl_renderbuffer_attachment *depth,
 514                              const struct gl_renderbuffer_attachment *stencil)
 515 {
 516    assert(depth && stencil);
 517
 518    if (depth->Type == stencil->Type) {
 519       if (depth->Type == GL_RENDERBUFFER_EXT &&
 520           depth->Renderbuffer == stencil->Renderbuffer)
 521          return GL_TRUE;
 522
 523       if (depth->Type == GL_TEXTURE &&
 524           depth->Texture == stencil->Texture)
 525          return GL_TRUE;
 526    }
 527
 528    return GL_FALSE;
 529 }
 530
 531
 532 /**
 533  * Check that the framebuffer configuration is valid in terms of what
 534  * the driver can support.
 535  *
 536  * For Gallium we only supports combined Z+stencil, not separate buffers.
 537  */
 538 static void
 539 st_validate_framebuffer(struct gl_context *ctx, struct gl_framebuffer *fb)
 540 {
 541    struct st_context *st = st_context(ctx);
 542    struct pipe_screen *screen = st->pipe->screen;
 543    const struct gl_renderbuffer_attachment *depth =
 544          &fb->Attachment[BUFFER_DEPTH];
 545    const struct gl_renderbuffer_attachment *stencil =
 546          &fb->Attachment[BUFFER_STENCIL];
 547    GLuint i;
 548    enum pipe_format first_format = PIPE_FORMAT_NONE;
 549    boolean mixed_formats =
 550          screen->get_param(screen, PIPE_CAP_MIXED_COLORBUFFER_FORMATS) != 0;
 551
 552    if (depth->Type && stencil->Type && depth->Type != stencil->Type) {
 553       fb->_Status = GL_FRAMEBUFFER_UNSUPPORTED_EXT;
 554       return;
 555    }
 556    if (depth->Type == GL_RENDERBUFFER_EXT &&
 557        stencil->Type == GL_RENDERBUFFER_EXT &&
 558        depth->Renderbuffer != stencil->Renderbuffer) {
 559       fb->_Status = GL_FRAMEBUFFER_UNSUPPORTED_EXT;
 560       return;
 561    }
 562    if (depth->Type == GL_TEXTURE &&
 563        stencil->Type == GL_TEXTURE &&
 564        depth->Texture != stencil->Texture) {
 565       fb->_Status = GL_FRAMEBUFFER_UNSUPPORTED_EXT;
 566       return;
 567    }
 568
 569    if (!st_validate_attachment(ctx,
 570                                screen,
 571                                depth,
 572                                PIPE_BIND_DEPTH_STENCIL)) {
 573       fb->_Status = GL_FRAMEBUFFER_UNSUPPORTED_EXT;
 574       return;
 575    }
 576    if (!st_validate_attachment(ctx,
 577                                screen,
 578                                stencil,
 579                                PIPE_BIND_DEPTH_STENCIL)) {
 580       fb->_Status = GL_FRAMEBUFFER_UNSUPPORTED_EXT;
 581       return;
 582    }
 583    for (i = 0; i < ctx->Const.MaxColorAttachments; i++) {
 584       struct gl_renderbuffer_attachment *att =
 585             &fb->Attachment[BUFFER_COLOR0 + i];
 586       enum pipe_format format;
 587
 588       if (!st_validate_attachment(ctx,
 589                                   screen,
 590                                   att,
 591                                   PIPE_BIND_RENDER_TARGET)) {
 592          fb->_Status = GL_FRAMEBUFFER_UNSUPPORTED_EXT;
 593          return;
 594       }
 595
 596       if (!mixed_formats) {
 597          /* Disallow mixed formats. */
 598          if (att->Type != GL_NONE) {
 599             format = st_renderbuffer(att->Renderbuffer)->surface->format;
 600          } else {
 601             continue;
 602          }
 603
 604          if (first_format == PIPE_FORMAT_NONE) {
 605             first_format = format;
 606          } else if (format != first_format) {
 607             fb->_Status = GL_FRAMEBUFFER_UNSUPPORTED_EXT;
 608             return;
 609          }
 610       }
 611    }
 612 }
 613
 614
 615 /**
 616  * Called via glDrawBuffer.
 617  */
 618 static void
 619 st_DrawBuffers(struct gl_context *ctx, GLsizei count, const GLenum *buffers)
 620 {
 621    struct st_context *st = st_context(ctx);
 622    struct gl_framebuffer *fb = ctx->DrawBuffer;
 623    GLuint i;
 624
 625    (void) count;
 626    (void) buffers;
 627
 628    /* add the renderbuffers on demand */
 629    for (i = 0; i < fb->_NumColorDrawBuffers; i++) {
 630       gl_buffer_index idx = fb->_ColorDrawBufferIndexes[i];
 631       st_manager_add_color_renderbuffer(st, fb, idx);
 632    }
 633 }
 634
 635
 636 /**
 637  * Called via glReadBuffer.
 638  */
 639 static void
 640 st_ReadBuffer(struct gl_context *ctx, GLenum buffer)
 641 {
 642    struct st_context *st = st_context(ctx);
 643    struct gl_framebuffer *fb = ctx->ReadBuffer;
 644
 645    (void) buffer;
 646
 647    /* add the renderbuffer on demand */
 648    st_manager_add_color_renderbuffer(st, fb, fb->_ColorReadBufferIndex);
 649 }
 650
 651
 652
 653 /**
 654  * Called via ctx->Driver.MapRenderbuffer.
 655  */
 656 static void
 657 st_MapRenderbuffer(struct gl_context *ctx,
 658                    struct gl_renderbuffer *rb,
 659                    GLuint x, GLuint y, GLuint w, GLuint h,
 660                    GLbitfield mode,
 661                    GLubyte **mapOut, GLint *rowStrideOut)
 662 {
 663    struct st_context *st = st_context(ctx);
 664    struct st_renderbuffer *strb = st_renderbuffer(rb);
 665    struct pipe_context *pipe = st->pipe;
 666    const GLboolean invert = rb->Name == 0;
 667    unsigned usage;
 668    GLuint y2;
 669
 670    usage = 0x0;
 671    if (mode & GL_MAP_READ_BIT)
 672       usage |= PIPE_TRANSFER_READ;
 673    if (mode & GL_MAP_WRITE_BIT)
 674       usage |= PIPE_TRANSFER_WRITE;
 675
 676    /* Note: y=0=bottom of buffer while y2=0=top of buffer.
 677     * 'invert' will be true for window-system buffers and false for
 678     * user-allocated renderbuffers and textures.
 679     */
 680    if (invert)
 681       y2 = strb->Base.Height - y - h;
 682    else
 683       y2 = y;
 684
 685    strb->transfer = pipe_get_transfer(pipe,
 686                                       strb->texture,
 687                                       strb->rtt_level,
 688                                       strb->rtt_face + strb->rtt_slice,
 689                                       usage, x, y2, w, h);
 690    if (strb->transfer) {
 691       GLubyte *map = pipe_transfer_map(pipe, strb->transfer);
 692       if (invert) {
 693          *rowStrideOut = -strb->transfer->stride;
 694          map += (h - 1) * strb->transfer->stride;
 695       }
 696       else {
 697          *rowStrideOut = strb->transfer->stride;
 698       }
 699       *mapOut = map;
 700    }
 701    else {
 702       *mapOut = NULL;
 703       *rowStrideOut = 0;
 704    }
 705 }
 706
 707
 708 /**
 709  * Called via ctx->Driver.UnmapRenderbuffer.
 710  */
 711 static void
 712 st_UnmapRenderbuffer(struct gl_context *ctx,
 713                      struct gl_renderbuffer *rb)
 714 {
 715    struct st_context *st = st_context(ctx);
 716    struct st_renderbuffer *strb = st_renderbuffer(rb);
 717    struct pipe_context *pipe = st->pipe;
 718
 719    pipe_transfer_unmap(pipe, strb->transfer);
 720    pipe->transfer_destroy(pipe, strb->transfer);
 721    strb->transfer = NULL;
 722 }
 723
 724
 725
 726 void st_init_fbo_functions(struct dd_function_table *functions)
 727 {
 728 #if FEATURE_EXT_framebuffer_object
 729    functions->NewFramebuffer = st_new_framebuffer;
 730    functions->NewRenderbuffer = st_new_renderbuffer;
 731    functions->BindFramebuffer = st_bind_framebuffer;
 732    functions->FramebufferRenderbuffer = st_framebuffer_renderbuffer;
 733    functions->RenderTexture = st_render_texture;
 734    functions->FinishRenderTexture = st_finish_render_texture;
 735    functions->ValidateFramebuffer = st_validate_framebuffer;
 736 #endif
 737    /* no longer needed by core Mesa, drivers handle resizes...
 738    functions->ResizeBuffers = st_resize_buffers;
 739    */
 740
 741    functions->DrawBuffers = st_DrawBuffers;
 742    functions->ReadBuffer = st_ReadBuffer;
 743
 744    functions->MapRenderbuffer = st_MapRenderbuffer;
 745    functions->UnmapRenderbuffer = st_UnmapRenderbuffer;
 746 }
 747
 748