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 static GLboolean
  61 st_renderbuffer_alloc_sw_storage(struct gl_context * ctx,
  62                                  struct gl_renderbuffer *rb,
  63                                  GLenum internalFormat,
  64                                  GLuint width, GLuint height)
  65 {
  66    struct st_context *st = st_context(ctx);
  67    struct st_renderbuffer *strb = st_renderbuffer(rb);
  68    enum pipe_format format;
  69    size_t size;
  70
  71    free(strb->data);
  72    strb->data = NULL;
  73
  74    if (internalFormat == GL_RGBA16_SNORM) {
  75       /* Special case for software accum buffers.  Otherwise, if the
  76        * call to st_choose_renderbuffer_format() fails (because the
  77        * driver doesn't support signed 16-bit/channel colors) we'd
  78        * just return without allocating the software accum buffer.
  79        */
  80       format = PIPE_FORMAT_R16G16B16A16_SNORM;
  81    }
  82    else {
  83       format = st_choose_renderbuffer_format(st, internalFormat, 0);
  84
  85       /* Not setting gl_renderbuffer::Format here will cause
  86        * FRAMEBUFFER_UNSUPPORTED and ValidateFramebuffer will not be called.
  87        */
  88       if (format == PIPE_FORMAT_NONE) {
  89          return GL_TRUE;
  90       }
  91    }
  92
  93    strb->Base.Format = st_pipe_format_to_mesa_format(format);
  94
  95    size = _mesa_format_image_size(strb->Base.Format, width, height, 1);
  96    strb->data = malloc(size);
  97    return strb->data != NULL;
  98 }
  99
 100
 101 /**
 102  * gl_renderbuffer::AllocStorage()
 103  * This is called to allocate the original drawing surface, and
 104  * during window resize.
 105  */
 106 static GLboolean
 107 st_renderbuffer_alloc_storage(struct gl_context * ctx,
 108                               struct gl_renderbuffer *rb,
 109                               GLenum internalFormat,
 110                               GLuint width, GLuint height)
 111 {
 112    struct st_context *st = st_context(ctx);
 113    struct pipe_context *pipe = st->pipe;
 114    struct pipe_screen *screen = st->pipe->screen;
 115    struct st_renderbuffer *strb = st_renderbuffer(rb);
 116    enum pipe_format format = PIPE_FORMAT_NONE;
 117    struct pipe_surface surf_tmpl;
 118    struct pipe_resource templ;
 119
 120    /* init renderbuffer fields */
 121    strb->Base.Width  = width;
 122    strb->Base.Height = height;
 123    strb->Base._BaseFormat = _mesa_base_fbo_format(ctx, internalFormat);
 124    strb->defined = GL_FALSE;  /* undefined contents now */
 125
 126    if (strb->software) {
 127       return st_renderbuffer_alloc_sw_storage(ctx, rb, internalFormat,
 128                                               width, height);
 129    }
 130
 131    /* Free the old surface and texture
 132     */
 133    pipe_surface_reference( &strb->surface, NULL );
 134    pipe_resource_reference( &strb->texture, NULL );
 135
 136    /* Handle multisample renderbuffers first.
 137     *
 138     * From ARB_framebuffer_object:
 139     *   If <samples> is zero, then RENDERBUFFER_SAMPLES is set to zero.
 140     *   Otherwise <samples> represents a request for a desired minimum
 141     *   number of samples. Since different implementations may support
 142     *   different sample counts for multisampled rendering, the actual
 143     *   number of samples allocated for the renderbuffer image is
 144     *   implementation dependent.  However, the resulting value for
 145     *   RENDERBUFFER_SAMPLES is guaranteed to be greater than or equal
 146     *   to <samples> and no more than the next larger sample count supported
 147     *   by the implementation.
 148     *
 149     * So let's find the supported number of samples closest to NumSamples.
 150     * (NumSamples == 1) is treated the same as (NumSamples == 0).
 151     */
 152    if (rb->NumSamples > 1) {
 153       unsigned i;
 154
 155       for (i = rb->NumSamples; i <= ctx->Const.MaxSamples; i++) {
 156          format = st_choose_renderbuffer_format(st, internalFormat, i);
 157
 158          if (format != PIPE_FORMAT_NONE) {
 159             rb->NumSamples = i;
 160             break;
 161          }
 162       }
 163    } else {
 164       format = st_choose_renderbuffer_format(st, internalFormat, 0);
 165    }
 166
 167    /* Not setting gl_renderbuffer::Format here will cause
 168     * FRAMEBUFFER_UNSUPPORTED and ValidateFramebuffer will not be called.
 169     */
 170    if (format == PIPE_FORMAT_NONE) {
 171       return GL_TRUE;
 172    }
 173
 174    strb->Base.Format = st_pipe_format_to_mesa_format(format);
 175
 176    if (width == 0 || height == 0) {
 177       /* if size is zero, nothing to allocate */
 178       return GL_TRUE;
 179    }
 180
 181    /* Setup new texture template.
 182     */
 183    memset(&templ, 0, sizeof(templ));
 184    templ.target = st->internal_target;
 185    templ.format = format;
 186    templ.width0 = width;
 187    templ.height0 = height;
 188    templ.depth0 = 1;
 189    templ.array_size = 1;
 190    templ.nr_samples = rb->NumSamples;
 191    if (util_format_is_depth_or_stencil(format)) {
 192       templ.bind = PIPE_BIND_DEPTH_STENCIL;
 193    }
 194    else if (strb->Base.Name != 0) {
 195       /* this is a user-created renderbuffer */
 196       templ.bind = PIPE_BIND_RENDER_TARGET;
 197    }
 198    else {
 199       /* this is a window-system buffer */
 200       templ.bind = (PIPE_BIND_DISPLAY_TARGET |
 201                     PIPE_BIND_RENDER_TARGET);
 202    }
 203
 204    strb->texture = screen->resource_create(screen, &templ);
 205
 206    if (!strb->texture)
 207       return FALSE;
 208
 209    u_surface_default_template(&surf_tmpl, strb->texture);
 210    strb->surface = pipe->create_surface(pipe,
 211                                         strb->texture,
 212                                         &surf_tmpl);
 213    if (strb->surface) {
 214       assert(strb->surface->texture);
 215       assert(strb->surface->format);
 216       assert(strb->surface->width == width);
 217       assert(strb->surface->height == height);
 218    }
 219
 220    return strb->surface != NULL;
 221 }
 222
 223
 224 /**
 225  * gl_renderbuffer::Delete()
 226  */
 227 static void
 228 st_renderbuffer_delete(struct gl_context *ctx, struct gl_renderbuffer *rb)
 229 {
 230    struct st_renderbuffer *strb = st_renderbuffer(rb);
 231    if (ctx) {
 232       struct st_context *st = st_context(ctx);
 233       pipe_surface_release(st->pipe, &strb->surface);
 234    }
 235    pipe_resource_reference(&strb->texture, NULL);
 236    free(strb->data);
 237    _mesa_delete_renderbuffer(ctx, rb);
 238 }
 239
 240
 241 /**
 242  * Called via ctx->Driver.NewFramebuffer()
 243  */
 244 static struct gl_framebuffer *
 245 st_new_framebuffer(struct gl_context *ctx, GLuint name)
 246 {
 247    /* XXX not sure we need to subclass gl_framebuffer for pipe */
 248    return _mesa_new_framebuffer(ctx, name);
 249 }
 250
 251
 252 /**
 253  * Called via ctx->Driver.NewRenderbuffer()
 254  */
 255 static struct gl_renderbuffer *
 256 st_new_renderbuffer(struct gl_context *ctx, GLuint name)
 257 {
 258    struct st_renderbuffer *strb = ST_CALLOC_STRUCT(st_renderbuffer);
 259    if (strb) {
 260       assert(name != 0);
 261       _mesa_init_renderbuffer(&strb->Base, name);
 262       strb->Base.Delete = st_renderbuffer_delete;
 263       strb->Base.AllocStorage = st_renderbuffer_alloc_storage;
 264       return &strb->Base;
 265    }
 266    return NULL;
 267 }
 268
 269
 270 /**
 271  * Allocate a renderbuffer for a an on-screen window (not a user-created
 272  * renderbuffer).  The window system code determines the format.
 273  */
 274 struct gl_renderbuffer *
 275 st_new_renderbuffer_fb(enum pipe_format format, int samples, boolean sw)
 276 {
 277    struct st_renderbuffer *strb;
 278
 279    strb = ST_CALLOC_STRUCT(st_renderbuffer);
 280    if (!strb) {
 281       _mesa_error(NULL, GL_OUT_OF_MEMORY, "creating renderbuffer");
 282       return NULL;
 283    }
 284
 285    _mesa_init_renderbuffer(&strb->Base, 0);
 286    strb->Base.ClassID = 0x4242; /* just a unique value */
 287    strb->Base.NumSamples = samples;
 288    strb->Base.Format = st_pipe_format_to_mesa_format(format);
 289    strb->Base._BaseFormat = _mesa_get_format_base_format(strb->Base.Format);
 290    strb->software = sw;
 291
 292    switch (format) {
 293    case PIPE_FORMAT_R8G8B8A8_UNORM:
 294    case PIPE_FORMAT_B8G8R8A8_UNORM:
 295    case PIPE_FORMAT_A8R8G8B8_UNORM:
 296       strb->Base.InternalFormat = GL_RGBA8;
 297       break;
 298    case PIPE_FORMAT_R8G8B8X8_UNORM:
 299    case PIPE_FORMAT_B8G8R8X8_UNORM:
 300    case PIPE_FORMAT_X8R8G8B8_UNORM:
 301       strb->Base.InternalFormat = GL_RGB8;
 302       break;
 303    case PIPE_FORMAT_B5G5R5A1_UNORM:
 304       strb->Base.InternalFormat = GL_RGB5_A1;
 305       break;
 306    case PIPE_FORMAT_B4G4R4A4_UNORM:
 307       strb->Base.InternalFormat = GL_RGBA4;
 308       break;
 309    case PIPE_FORMAT_B5G6R5_UNORM:
 310       strb->Base.InternalFormat = GL_RGB565;
 311       break;
 312    case PIPE_FORMAT_Z16_UNORM:
 313       strb->Base.InternalFormat = GL_DEPTH_COMPONENT16;
 314       break;
 315    case PIPE_FORMAT_Z32_UNORM:
 316       strb->Base.InternalFormat = GL_DEPTH_COMPONENT32;
 317       break;
 318    case PIPE_FORMAT_Z24_UNORM_S8_UINT:
 319    case PIPE_FORMAT_S8_UINT_Z24_UNORM:
 320       strb->Base.InternalFormat = GL_DEPTH24_STENCIL8_EXT;
 321       break;
 322    case PIPE_FORMAT_Z24X8_UNORM:
 323    case PIPE_FORMAT_X8Z24_UNORM:
 324       strb->Base.InternalFormat = GL_DEPTH_COMPONENT24;
 325       break;
 326    case PIPE_FORMAT_S8_UINT:
 327       strb->Base.InternalFormat = GL_STENCIL_INDEX8_EXT;
 328       break;
 329    case PIPE_FORMAT_R16G16B16A16_SNORM:
 330       /* accum buffer */
 331       strb->Base.InternalFormat = GL_RGBA16_SNORM;
 332       break;
 333    case PIPE_FORMAT_R16G16B16A16_UNORM:
 334       strb->Base.InternalFormat = GL_RGBA16;
 335       break;
 336    case PIPE_FORMAT_R8_UNORM:
 337       strb->Base.InternalFormat = GL_R8;
 338       break;
 339    case PIPE_FORMAT_R8G8_UNORM:
 340       strb->Base.InternalFormat = GL_RG8;
 341       break;
 342    case PIPE_FORMAT_R16_UNORM:
 343       strb->Base.InternalFormat = GL_R16;
 344       break;
 345    case PIPE_FORMAT_R16G16_UNORM:
 346       strb->Base.InternalFormat = GL_RG16;
 347       break;
 348    case PIPE_FORMAT_R32G32B32A32_FLOAT:
 349       strb->Base.InternalFormat = GL_RGBA32F;
 350       break;
 351    case PIPE_FORMAT_R16G16B16A16_FLOAT:
 352       strb->Base.InternalFormat = GL_RGBA16F;
 353       break;
 354    default:
 355       _mesa_problem(NULL,
 356                     "Unexpected format %s in st_new_renderbuffer_fb",
 357                     util_format_name(format));
 358       free(strb);
 359       return NULL;
 360    }
 361
 362    /* st-specific methods */
 363    strb->Base.Delete = st_renderbuffer_delete;
 364    strb->Base.AllocStorage = st_renderbuffer_alloc_storage;
 365
 366    /* surface is allocated in st_renderbuffer_alloc_storage() */
 367    strb->surface = NULL;
 368
 369    return &strb->Base;
 370 }
 371
 372
 373 /**
 374  * Called via ctx->Driver.BindFramebufferEXT().
 375  */
 376 static void
 377 st_bind_framebuffer(struct gl_context *ctx, GLenum target,
 378                     struct gl_framebuffer *fb, struct gl_framebuffer *fbread)
 379 {
 380    /* no-op */
 381 }
 382
 383
 384 /**
 385  * Called by ctx->Driver.RenderTexture
 386  */
 387 static void
 388 st_render_texture(struct gl_context *ctx,
 389                   struct gl_framebuffer *fb,
 390                   struct gl_renderbuffer_attachment *att)
 391 {
 392    struct st_context *st = st_context(ctx);
 393    struct pipe_context *pipe = st->pipe;
 394    struct st_renderbuffer *strb;
 395    struct gl_renderbuffer *rb;
 396    struct pipe_resource *pt;
 397    struct st_texture_object *stObj;
 398    const struct gl_texture_image *texImage;
 399    struct pipe_surface surf_tmpl;
 400
 401    if (!st_finalize_texture(ctx, pipe, att->Texture))
 402       return;
 403
 404    pt = st_get_texobj_resource(att->Texture);
 405    assert(pt);
 406
 407    /* get pointer to texture image we're rendeing to */
 408    texImage = _mesa_get_attachment_teximage(att);
 409
 410    /* create new renderbuffer which wraps the texture image.
 411     * Use the texture's name as the renderbuffer's name so that we have
 412     * something that's non-zero (to determine vertical orientation) and
 413     * possibly helpful for debugging.
 414     */
 415    rb = st_new_renderbuffer(ctx, att->Texture->Name);
 416    if (!rb) {
 417       _mesa_error(ctx, GL_OUT_OF_MEMORY, "glFramebufferTexture()");
 418       return;
 419    }
 420
 421    _mesa_reference_renderbuffer(&att->Renderbuffer, rb);
 422    assert(rb->RefCount == 1);
 423    rb->AllocStorage = NULL; /* should not get called */
 424    strb = st_renderbuffer(rb);
 425
 426    assert(strb->Base.RefCount > 0);
 427
 428    /* get the texture for the texture object */
 429    stObj = st_texture_object(att->Texture);
 430
 431    /* point renderbuffer at texobject */
 432    strb->rtt = stObj;
 433    strb->rtt_level = att->TextureLevel;
 434    strb->rtt_face = att->CubeMapFace;
 435    strb->rtt_slice = att->Zoffset;
 436
 437    rb->Width = texImage->Width2;
 438    rb->Height = texImage->Height2;
 439    rb->_BaseFormat = texImage->_BaseFormat;
 440    rb->InternalFormat = texImage->InternalFormat;
 441
 442    pipe_resource_reference( &strb->texture, pt );
 443
 444    pipe_surface_release(pipe, &strb->surface);
 445
 446    assert(strb->rtt_level <= strb->texture->last_level);
 447
 448    /* new surface for rendering into the texture */
 449    memset(&surf_tmpl, 0, sizeof(surf_tmpl));
 450    surf_tmpl.format = ctx->Color.sRGBEnabled
 451       ? strb->texture->format : util_format_linear(strb->texture->format);
 452    surf_tmpl.u.tex.level = strb->rtt_level;
 453    surf_tmpl.u.tex.first_layer = strb->rtt_face + strb->rtt_slice;
 454    surf_tmpl.u.tex.last_layer = strb->rtt_face + strb->rtt_slice;
 455    strb->surface = pipe->create_surface(pipe,
 456                                         strb->texture,
 457                                         &surf_tmpl);
 458
 459    strb->Base.Format = st_pipe_format_to_mesa_format(pt->format);
 460
 461    /* Invalidate buffer state so that the pipe's framebuffer state
 462     * gets updated.
 463     * That's where the new renderbuffer (which we just created) gets
 464     * passed to the pipe as a (color/depth) render target.
 465     */
 466    st_invalidate_state(ctx, _NEW_BUFFERS);
 467
 468
 469    /* Need to trigger a call to update_framebuffer() since we just
 470     * attached a new renderbuffer.
 471     */
 472    ctx->NewState |= _NEW_BUFFERS;
 473 }
 474
 475
 476 /**
 477  * Called via ctx->Driver.FinishRenderTexture.
 478  */
 479 static void
 480 st_finish_render_texture(struct gl_context *ctx,
 481                          struct gl_renderbuffer_attachment *att)
 482 {
 483    struct st_renderbuffer *strb = st_renderbuffer(att->Renderbuffer);
 484
 485    if (!strb)
 486       return;
 487
 488    strb->rtt = NULL;
 489
 490    /* restore previous framebuffer state */
 491    st_invalidate_state(ctx, _NEW_BUFFERS);
 492 }
 493
 494
 495 /** Debug helper */
 496 static void
 497 st_fbo_invalid(const char *reason)
 498 {
 499    if (MESA_DEBUG_FLAGS & DEBUG_INCOMPLETE_FBO) {
 500       _mesa_debug(NULL, "Invalid FBO: %s\n", reason);
 501    }
 502 }
 503
 504
 505 /**
 506  * Validate a renderbuffer attachment for a particular set of bindings.
 507  */
 508 static GLboolean
 509 st_validate_attachment(struct gl_context *ctx,
 510                        struct pipe_screen *screen,
 511                        const struct gl_renderbuffer_attachment *att,
 512                        unsigned bindings)
 513 {
 514    const struct st_texture_object *stObj = st_texture_object(att->Texture);
 515    enum pipe_format format;
 516    gl_format texFormat;
 517    GLboolean valid;
 518
 519    /* Only validate texture attachments for now, since
 520     * st_renderbuffer_alloc_storage makes sure that
 521     * the format is supported.
 522     */
 523    if (att->Type != GL_TEXTURE)
 524       return GL_TRUE;
 525
 526    if (!stObj)
 527       return GL_FALSE;
 528
 529    format = stObj->pt->format;
 530    texFormat = _mesa_get_attachment_teximage_const(att)->TexFormat;
 531
 532    /* If the encoding is sRGB and sRGB rendering cannot be enabled,
 533     * check for linear format support instead.
 534     * Later when we create a surface, we change the format to a linear one. */
 535    if (!ctx->Extensions.EXT_framebuffer_sRGB &&
 536        _mesa_get_format_color_encoding(texFormat) == GL_SRGB) {
 537       const gl_format linearFormat = _mesa_get_srgb_format_linear(texFormat);
 538       format = st_mesa_format_to_pipe_format(linearFormat);
 539    }
 540
 541    valid = screen->is_format_supported(screen, format,
 542                                       PIPE_TEXTURE_2D,
 543                                       stObj->pt->nr_samples, bindings);
 544    if (!valid) {
 545       st_fbo_invalid("Invalid format");
 546    }
 547
 548    return valid;
 549 }
 550
 551
 552 /**
 553  * Check if two renderbuffer attachments name a combined depth/stencil
 554  * renderbuffer.
 555  */
 556 GLboolean
 557 st_is_depth_stencil_combined(const struct gl_renderbuffer_attachment *depth,
 558                              const struct gl_renderbuffer_attachment *stencil)
 559 {
 560    assert(depth && stencil);
 561
 562    if (depth->Type == stencil->Type) {
 563       if (depth->Type == GL_RENDERBUFFER_EXT &&
 564           depth->Renderbuffer == stencil->Renderbuffer)
 565          return GL_TRUE;
 566
 567       if (depth->Type == GL_TEXTURE &&
 568           depth->Texture == stencil->Texture)
 569          return GL_TRUE;
 570    }
 571
 572    return GL_FALSE;
 573 }
 574
 575
 576 /**
 577  * Check that the framebuffer configuration is valid in terms of what
 578  * the driver can support.
 579  *
 580  * For Gallium we only supports combined Z+stencil, not separate buffers.
 581  */
 582 static void
 583 st_validate_framebuffer(struct gl_context *ctx, struct gl_framebuffer *fb)
 584 {
 585    struct st_context *st = st_context(ctx);
 586    struct pipe_screen *screen = st->pipe->screen;
 587    const struct gl_renderbuffer_attachment *depth =
 588          &fb->Attachment[BUFFER_DEPTH];
 589    const struct gl_renderbuffer_attachment *stencil =
 590          &fb->Attachment[BUFFER_STENCIL];
 591    GLuint i;
 592    enum pipe_format first_format = PIPE_FORMAT_NONE;
 593    boolean mixed_formats =
 594          screen->get_param(screen, PIPE_CAP_MIXED_COLORBUFFER_FORMATS) != 0;
 595
 596    if (depth->Type && stencil->Type && depth->Type != stencil->Type) {
 597       st_fbo_invalid("Different Depth/Stencil buffer formats");
 598       fb->_Status = GL_FRAMEBUFFER_UNSUPPORTED_EXT;
 599       return;
 600    }
 601    if (depth->Type == GL_RENDERBUFFER_EXT &&
 602        stencil->Type == GL_RENDERBUFFER_EXT &&
 603        depth->Renderbuffer != stencil->Renderbuffer) {
 604       st_fbo_invalid("Separate Depth/Stencil buffers");
 605       fb->_Status = GL_FRAMEBUFFER_UNSUPPORTED_EXT;
 606       return;
 607    }
 608    if (depth->Type == GL_TEXTURE &&
 609        stencil->Type == GL_TEXTURE &&
 610        depth->Texture != stencil->Texture) {
 611       fb->_Status = GL_FRAMEBUFFER_UNSUPPORTED_EXT;
 612       st_fbo_invalid("Different Depth/Stencil textures");
 613       return;
 614    }
 615
 616    if (!st_validate_attachment(ctx,
 617                                screen,
 618                                depth,
 619                                PIPE_BIND_DEPTH_STENCIL)) {
 620       fb->_Status = GL_FRAMEBUFFER_UNSUPPORTED_EXT;
 621       return;
 622    }
 623    if (!st_validate_attachment(ctx,
 624                                screen,
 625                                stencil,
 626                                PIPE_BIND_DEPTH_STENCIL)) {
 627       fb->_Status = GL_FRAMEBUFFER_UNSUPPORTED_EXT;
 628       return;
 629    }
 630    for (i = 0; i < ctx->Const.MaxColorAttachments; i++) {
 631       struct gl_renderbuffer_attachment *att =
 632             &fb->Attachment[BUFFER_COLOR0 + i];
 633       enum pipe_format format;
 634
 635       if (!st_validate_attachment(ctx,
 636                                   screen,
 637                                   att,
 638                                   PIPE_BIND_RENDER_TARGET)) {
 639          fb->_Status = GL_FRAMEBUFFER_UNSUPPORTED_EXT;
 640          return;
 641       }
 642
 643       if (!mixed_formats) {
 644          /* Disallow mixed formats. */
 645          if (att->Type != GL_NONE) {
 646             format = st_renderbuffer(att->Renderbuffer)->surface->format;
 647          } else {
 648             continue;
 649          }
 650
 651          if (first_format == PIPE_FORMAT_NONE) {
 652             first_format = format;
 653          } else if (format != first_format) {
 654             fb->_Status = GL_FRAMEBUFFER_UNSUPPORTED_EXT;
 655             st_fbo_invalid("Mixed color formats");
 656             return;
 657          }
 658       }
 659    }
 660 }
 661
 662
 663 /**
 664  * Called via glDrawBuffer.
 665  */
 666 static void
 667 st_DrawBuffers(struct gl_context *ctx, GLsizei count, const GLenum *buffers)
 668 {
 669    struct st_context *st = st_context(ctx);
 670    struct gl_framebuffer *fb = ctx->DrawBuffer;
 671    GLuint i;
 672
 673    (void) count;
 674    (void) buffers;
 675
 676    /* add the renderbuffers on demand */
 677    for (i = 0; i < fb->_NumColorDrawBuffers; i++) {
 678       gl_buffer_index idx = fb->_ColorDrawBufferIndexes[i];
 679       st_manager_add_color_renderbuffer(st, fb, idx);
 680    }
 681 }
 682
 683
 684 /**
 685  * Called via glReadBuffer.
 686  */
 687 static void
 688 st_ReadBuffer(struct gl_context *ctx, GLenum buffer)
 689 {
 690    struct st_context *st = st_context(ctx);
 691    struct gl_framebuffer *fb = ctx->ReadBuffer;
 692
 693    (void) buffer;
 694
 695    /* add the renderbuffer on demand */
 696    st_manager_add_color_renderbuffer(st, fb, fb->_ColorReadBufferIndex);
 697 }
 698
 699
 700
 701 /**
 702  * Called via ctx->Driver.MapRenderbuffer.
 703  */
 704 static void
 705 st_MapRenderbuffer(struct gl_context *ctx,
 706                    struct gl_renderbuffer *rb,
 707                    GLuint x, GLuint y, GLuint w, GLuint h,
 708                    GLbitfield mode,
 709                    GLubyte **mapOut, GLint *rowStrideOut)
 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    const GLboolean invert = rb->Name == 0;
 715    unsigned usage;
 716    GLuint y2;
 717    GLubyte *map;
 718
 719    if (strb->software) {
 720       /* software-allocated renderbuffer (probably an accum buffer) */
 721       if (strb->data) {
 722          GLint bpp = _mesa_get_format_bytes(strb->Base.Format);
 723          GLint stride = _mesa_format_row_stride(strb->Base.Format,
 724                                                 strb->Base.Width);
 725          *mapOut = (GLubyte *) strb->data + y * stride + x * bpp;
 726          *rowStrideOut = stride;
 727       }
 728       else {
 729          *mapOut = NULL;
 730          *rowStrideOut = 0;
 731       }
 732       return;
 733    }
 734
 735    usage = 0x0;
 736    if (mode & GL_MAP_READ_BIT)
 737       usage |= PIPE_TRANSFER_READ;
 738    if (mode & GL_MAP_WRITE_BIT)
 739       usage |= PIPE_TRANSFER_WRITE;
 740    if (mode & GL_MAP_INVALIDATE_RANGE_BIT)
 741       usage |= PIPE_TRANSFER_DISCARD_RANGE;
 742
 743    /* Note: y=0=bottom of buffer while y2=0=top of buffer.
 744     * 'invert' will be true for window-system buffers and false for
 745     * user-allocated renderbuffers and textures.
 746     */
 747    if (invert)
 748       y2 = strb->Base.Height - y - h;
 749    else
 750       y2 = y;
 751
 752     map = pipe_transfer_map(pipe,
 753                             strb->texture,
 754                             strb->rtt_level,
 755                             strb->rtt_face + strb->rtt_slice,
 756                             usage, x, y2, w, h, &strb->transfer);
 757    if (map) {
 758       if (invert) {
 759          *rowStrideOut = -(int) strb->transfer->stride;
 760          map += (h - 1) * strb->transfer->stride;
 761       }
 762       else {
 763          *rowStrideOut = strb->transfer->stride;
 764       }
 765       *mapOut = map;
 766    }
 767    else {
 768       *mapOut = NULL;
 769       *rowStrideOut = 0;
 770    }
 771 }
 772
 773
 774 /**
 775  * Called via ctx->Driver.UnmapRenderbuffer.
 776  */
 777 static void
 778 st_UnmapRenderbuffer(struct gl_context *ctx,
 779                      struct gl_renderbuffer *rb)
 780 {
 781    struct st_context *st = st_context(ctx);
 782    struct st_renderbuffer *strb = st_renderbuffer(rb);
 783    struct pipe_context *pipe = st->pipe;
 784
 785    if (strb->software) {
 786       /* software-allocated renderbuffer (probably an accum buffer) */
 787       return;
 788    }
 789
 790    pipe_transfer_unmap(pipe, strb->transfer);
 791    strb->transfer = NULL;
 792 }
 793
 794
 795
 796 void st_init_fbo_functions(struct dd_function_table *functions)
 797 {
 798    functions->NewFramebuffer = st_new_framebuffer;
 799    functions->NewRenderbuffer = st_new_renderbuffer;
 800    functions->BindFramebuffer = st_bind_framebuffer;
 801    functions->FramebufferRenderbuffer = _mesa_framebuffer_renderbuffer;
 802    functions->RenderTexture = st_render_texture;
 803    functions->FinishRenderTexture = st_finish_render_texture;
 804    functions->ValidateFramebuffer = st_validate_framebuffer;
 805
 806    functions->DrawBuffers = st_DrawBuffers;
 807    functions->ReadBuffer = st_ReadBuffer;
 808
 809    functions->MapRenderbuffer = st_MapRenderbuffer;
 810    functions->UnmapRenderbuffer = st_UnmapRenderbuffer;
 811 }
 812
 813