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_R8_UNORM:
 334       strb->Base.InternalFormat = GL_R8;
 335       break;
 336    case PIPE_FORMAT_R8G8_UNORM:
 337       strb->Base.InternalFormat = GL_RG8;
 338       break;
 339    case PIPE_FORMAT_R16_UNORM:
 340       strb->Base.InternalFormat = GL_R16;
 341       break;
 342    case PIPE_FORMAT_R16G16_UNORM:
 343       strb->Base.InternalFormat = GL_RG16;
 344       break;
 345    case PIPE_FORMAT_R32G32B32A32_FLOAT:
 346       strb->Base.InternalFormat = GL_RGBA32F;
 347       break;
 348    case PIPE_FORMAT_R16G16B16A16_FLOAT:
 349       strb->Base.InternalFormat = GL_RGBA16F;
 350       break;
 351    default:
 352       _mesa_problem(NULL,
 353                     "Unexpected format %s in st_new_renderbuffer_fb",
 354                     util_format_name(format));
 355       free(strb);
 356       return NULL;
 357    }
 358
 359    /* st-specific methods */
 360    strb->Base.Delete = st_renderbuffer_delete;
 361    strb->Base.AllocStorage = st_renderbuffer_alloc_storage;
 362
 363    /* surface is allocated in st_renderbuffer_alloc_storage() */
 364    strb->surface = NULL;
 365
 366    return &strb->Base;
 367 }
 368
 369
 370 /**
 371  * Called via ctx->Driver.BindFramebufferEXT().
 372  */
 373 static void
 374 st_bind_framebuffer(struct gl_context *ctx, GLenum target,
 375                     struct gl_framebuffer *fb, struct gl_framebuffer *fbread)
 376 {
 377    /* no-op */
 378 }
 379
 380
 381 /**
 382  * Called by ctx->Driver.RenderTexture
 383  */
 384 static void
 385 st_render_texture(struct gl_context *ctx,
 386                   struct gl_framebuffer *fb,
 387                   struct gl_renderbuffer_attachment *att)
 388 {
 389    struct st_context *st = st_context(ctx);
 390    struct pipe_context *pipe = st->pipe;
 391    struct st_renderbuffer *strb;
 392    struct gl_renderbuffer *rb;
 393    struct pipe_resource *pt;
 394    struct st_texture_object *stObj;
 395    const struct gl_texture_image *texImage;
 396    struct pipe_surface surf_tmpl;
 397
 398    if (!st_finalize_texture(ctx, pipe, att->Texture))
 399       return;
 400
 401    pt = st_get_texobj_resource(att->Texture);
 402    assert(pt);
 403
 404    /* get pointer to texture image we're rendeing to */
 405    texImage = _mesa_get_attachment_teximage(att);
 406
 407    /* create new renderbuffer which wraps the texture image.
 408     * Use the texture's name as the renderbuffer's name so that we have
 409     * something that's non-zero (to determine vertical orientation) and
 410     * possibly helpful for debugging.
 411     */
 412    rb = st_new_renderbuffer(ctx, att->Texture->Name);
 413    if (!rb) {
 414       _mesa_error(ctx, GL_OUT_OF_MEMORY, "glFramebufferTexture()");
 415       return;
 416    }
 417
 418    _mesa_reference_renderbuffer(&att->Renderbuffer, rb);
 419    assert(rb->RefCount == 1);
 420    rb->AllocStorage = NULL; /* should not get called */
 421    strb = st_renderbuffer(rb);
 422
 423    assert(strb->Base.RefCount > 0);
 424
 425    /* get the texture for the texture object */
 426    stObj = st_texture_object(att->Texture);
 427
 428    /* point renderbuffer at texobject */
 429    strb->rtt = stObj;
 430    strb->rtt_level = att->TextureLevel;
 431    strb->rtt_face = att->CubeMapFace;
 432    strb->rtt_slice = att->Zoffset;
 433
 434    rb->Width = texImage->Width2;
 435    rb->Height = texImage->Height2;
 436    rb->_BaseFormat = texImage->_BaseFormat;
 437    rb->InternalFormat = texImage->InternalFormat;
 438
 439    pipe_resource_reference( &strb->texture, pt );
 440
 441    pipe_surface_release(pipe, &strb->surface);
 442
 443    assert(strb->rtt_level <= strb->texture->last_level);
 444
 445    /* new surface for rendering into the texture */
 446    memset(&surf_tmpl, 0, sizeof(surf_tmpl));
 447    surf_tmpl.format = ctx->Color.sRGBEnabled
 448       ? strb->texture->format : util_format_linear(strb->texture->format);
 449    surf_tmpl.u.tex.level = strb->rtt_level;
 450    surf_tmpl.u.tex.first_layer = strb->rtt_face + strb->rtt_slice;
 451    surf_tmpl.u.tex.last_layer = strb->rtt_face + strb->rtt_slice;
 452    strb->surface = pipe->create_surface(pipe,
 453                                         strb->texture,
 454                                         &surf_tmpl);
 455
 456    strb->Base.Format = st_pipe_format_to_mesa_format(pt->format);
 457
 458    /* Invalidate buffer state so that the pipe's framebuffer state
 459     * gets updated.
 460     * That's where the new renderbuffer (which we just created) gets
 461     * passed to the pipe as a (color/depth) render target.
 462     */
 463    st_invalidate_state(ctx, _NEW_BUFFERS);
 464
 465
 466    /* Need to trigger a call to update_framebuffer() since we just
 467     * attached a new renderbuffer.
 468     */
 469    ctx->NewState |= _NEW_BUFFERS;
 470 }
 471
 472
 473 /**
 474  * Called via ctx->Driver.FinishRenderTexture.
 475  */
 476 static void
 477 st_finish_render_texture(struct gl_context *ctx,
 478                          struct gl_renderbuffer_attachment *att)
 479 {
 480    struct st_renderbuffer *strb = st_renderbuffer(att->Renderbuffer);
 481
 482    if (!strb)
 483       return;
 484
 485    strb->rtt = NULL;
 486
 487    /* restore previous framebuffer state */
 488    st_invalidate_state(ctx, _NEW_BUFFERS);
 489 }
 490
 491
 492 /** Debug helper */
 493 static void
 494 st_fbo_invalid(const char *reason)
 495 {
 496    if (MESA_DEBUG_FLAGS & DEBUG_INCOMPLETE_FBO) {
 497       _mesa_debug(NULL, "Invalid FBO: %s\n", reason);
 498    }
 499 }
 500
 501
 502 /**
 503  * Validate a renderbuffer attachment for a particular set of bindings.
 504  */
 505 static GLboolean
 506 st_validate_attachment(struct gl_context *ctx,
 507                        struct pipe_screen *screen,
 508                        const struct gl_renderbuffer_attachment *att,
 509                        unsigned bindings)
 510 {
 511    const struct st_texture_object *stObj = st_texture_object(att->Texture);
 512    enum pipe_format format;
 513    gl_format texFormat;
 514    GLboolean valid;
 515
 516    /* Only validate texture attachments for now, since
 517     * st_renderbuffer_alloc_storage makes sure that
 518     * the format is supported.
 519     */
 520    if (att->Type != GL_TEXTURE)
 521       return GL_TRUE;
 522
 523    if (!stObj)
 524       return GL_FALSE;
 525
 526    format = stObj->pt->format;
 527    texFormat = _mesa_get_attachment_teximage_const(att)->TexFormat;
 528
 529    /* If the encoding is sRGB and sRGB rendering cannot be enabled,
 530     * check for linear format support instead.
 531     * Later when we create a surface, we change the format to a linear one. */
 532    if (!ctx->Extensions.EXT_framebuffer_sRGB &&
 533        _mesa_get_format_color_encoding(texFormat) == GL_SRGB) {
 534       const gl_format linearFormat = _mesa_get_srgb_format_linear(texFormat);
 535       format = st_mesa_format_to_pipe_format(linearFormat);
 536    }
 537
 538    valid = screen->is_format_supported(screen, format,
 539                                       PIPE_TEXTURE_2D,
 540                                       stObj->pt->nr_samples, bindings);
 541    if (!valid) {
 542       st_fbo_invalid("Invalid format");
 543    }
 544
 545    return valid;
 546 }
 547
 548
 549 /**
 550  * Check if two renderbuffer attachments name a combined depth/stencil
 551  * renderbuffer.
 552  */
 553 GLboolean
 554 st_is_depth_stencil_combined(const struct gl_renderbuffer_attachment *depth,
 555                              const struct gl_renderbuffer_attachment *stencil)
 556 {
 557    assert(depth && stencil);
 558
 559    if (depth->Type == stencil->Type) {
 560       if (depth->Type == GL_RENDERBUFFER_EXT &&
 561           depth->Renderbuffer == stencil->Renderbuffer)
 562          return GL_TRUE;
 563
 564       if (depth->Type == GL_TEXTURE &&
 565           depth->Texture == stencil->Texture)
 566          return GL_TRUE;
 567    }
 568
 569    return GL_FALSE;
 570 }
 571
 572
 573 /**
 574  * Check that the framebuffer configuration is valid in terms of what
 575  * the driver can support.
 576  *
 577  * For Gallium we only supports combined Z+stencil, not separate buffers.
 578  */
 579 static void
 580 st_validate_framebuffer(struct gl_context *ctx, struct gl_framebuffer *fb)
 581 {
 582    struct st_context *st = st_context(ctx);
 583    struct pipe_screen *screen = st->pipe->screen;
 584    const struct gl_renderbuffer_attachment *depth =
 585          &fb->Attachment[BUFFER_DEPTH];
 586    const struct gl_renderbuffer_attachment *stencil =
 587          &fb->Attachment[BUFFER_STENCIL];
 588    GLuint i;
 589    enum pipe_format first_format = PIPE_FORMAT_NONE;
 590    boolean mixed_formats =
 591          screen->get_param(screen, PIPE_CAP_MIXED_COLORBUFFER_FORMATS) != 0;
 592
 593    if (depth->Type && stencil->Type && depth->Type != stencil->Type) {
 594       st_fbo_invalid("Different Depth/Stencil buffer formats");
 595       fb->_Status = GL_FRAMEBUFFER_UNSUPPORTED_EXT;
 596       return;
 597    }
 598    if (depth->Type == GL_RENDERBUFFER_EXT &&
 599        stencil->Type == GL_RENDERBUFFER_EXT &&
 600        depth->Renderbuffer != stencil->Renderbuffer) {
 601       st_fbo_invalid("Separate Depth/Stencil buffers");
 602       fb->_Status = GL_FRAMEBUFFER_UNSUPPORTED_EXT;
 603       return;
 604    }
 605    if (depth->Type == GL_TEXTURE &&
 606        stencil->Type == GL_TEXTURE &&
 607        depth->Texture != stencil->Texture) {
 608       fb->_Status = GL_FRAMEBUFFER_UNSUPPORTED_EXT;
 609       st_fbo_invalid("Different Depth/Stencil textures");
 610       return;
 611    }
 612
 613    if (!st_validate_attachment(ctx,
 614                                screen,
 615                                depth,
 616                                PIPE_BIND_DEPTH_STENCIL)) {
 617       fb->_Status = GL_FRAMEBUFFER_UNSUPPORTED_EXT;
 618       return;
 619    }
 620    if (!st_validate_attachment(ctx,
 621                                screen,
 622                                stencil,
 623                                PIPE_BIND_DEPTH_STENCIL)) {
 624       fb->_Status = GL_FRAMEBUFFER_UNSUPPORTED_EXT;
 625       return;
 626    }
 627    for (i = 0; i < ctx->Const.MaxColorAttachments; i++) {
 628       struct gl_renderbuffer_attachment *att =
 629             &fb->Attachment[BUFFER_COLOR0 + i];
 630       enum pipe_format format;
 631
 632       if (!st_validate_attachment(ctx,
 633                                   screen,
 634                                   att,
 635                                   PIPE_BIND_RENDER_TARGET)) {
 636          fb->_Status = GL_FRAMEBUFFER_UNSUPPORTED_EXT;
 637          return;
 638       }
 639
 640       if (!mixed_formats) {
 641          /* Disallow mixed formats. */
 642          if (att->Type != GL_NONE) {
 643             format = st_renderbuffer(att->Renderbuffer)->surface->format;
 644          } else {
 645             continue;
 646          }
 647
 648          if (first_format == PIPE_FORMAT_NONE) {
 649             first_format = format;
 650          } else if (format != first_format) {
 651             fb->_Status = GL_FRAMEBUFFER_UNSUPPORTED_EXT;
 652             st_fbo_invalid("Mixed color formats");
 653             return;
 654          }
 655       }
 656    }
 657 }
 658
 659
 660 /**
 661  * Called via glDrawBuffer.
 662  */
 663 static void
 664 st_DrawBuffers(struct gl_context *ctx, GLsizei count, const GLenum *buffers)
 665 {
 666    struct st_context *st = st_context(ctx);
 667    struct gl_framebuffer *fb = ctx->DrawBuffer;
 668    GLuint i;
 669
 670    (void) count;
 671    (void) buffers;
 672
 673    /* add the renderbuffers on demand */
 674    for (i = 0; i < fb->_NumColorDrawBuffers; i++) {
 675       gl_buffer_index idx = fb->_ColorDrawBufferIndexes[i];
 676       st_manager_add_color_renderbuffer(st, fb, idx);
 677    }
 678 }
 679
 680
 681 /**
 682  * Called via glReadBuffer.
 683  */
 684 static void
 685 st_ReadBuffer(struct gl_context *ctx, GLenum buffer)
 686 {
 687    struct st_context *st = st_context(ctx);
 688    struct gl_framebuffer *fb = ctx->ReadBuffer;
 689
 690    (void) buffer;
 691
 692    /* add the renderbuffer on demand */
 693    st_manager_add_color_renderbuffer(st, fb, fb->_ColorReadBufferIndex);
 694 }
 695
 696
 697
 698 /**
 699  * Called via ctx->Driver.MapRenderbuffer.
 700  */
 701 static void
 702 st_MapRenderbuffer(struct gl_context *ctx,
 703                    struct gl_renderbuffer *rb,
 704                    GLuint x, GLuint y, GLuint w, GLuint h,
 705                    GLbitfield mode,
 706                    GLubyte **mapOut, GLint *rowStrideOut)
 707 {
 708    struct st_context *st = st_context(ctx);
 709    struct st_renderbuffer *strb = st_renderbuffer(rb);
 710    struct pipe_context *pipe = st->pipe;
 711    const GLboolean invert = rb->Name == 0;
 712    unsigned usage;
 713    GLuint y2;
 714    GLubyte *map;
 715
 716    if (strb->software) {
 717       /* software-allocated renderbuffer (probably an accum buffer) */
 718       if (strb->data) {
 719          GLint bpp = _mesa_get_format_bytes(strb->Base.Format);
 720          GLint stride = _mesa_format_row_stride(strb->Base.Format,
 721                                                 strb->Base.Width);
 722          *mapOut = (GLubyte *) strb->data + y * stride + x * bpp;
 723          *rowStrideOut = stride;
 724       }
 725       else {
 726          *mapOut = NULL;
 727          *rowStrideOut = 0;
 728       }
 729       return;
 730    }
 731
 732    usage = 0x0;
 733    if (mode & GL_MAP_READ_BIT)
 734       usage |= PIPE_TRANSFER_READ;
 735    if (mode & GL_MAP_WRITE_BIT)
 736       usage |= PIPE_TRANSFER_WRITE;
 737    if (mode & GL_MAP_INVALIDATE_RANGE_BIT)
 738       usage |= PIPE_TRANSFER_DISCARD_RANGE;
 739
 740    /* Note: y=0=bottom of buffer while y2=0=top of buffer.
 741     * 'invert' will be true for window-system buffers and false for
 742     * user-allocated renderbuffers and textures.
 743     */
 744    if (invert)
 745       y2 = strb->Base.Height - y - h;
 746    else
 747       y2 = y;
 748
 749     map = pipe_transfer_map(pipe,
 750                             strb->texture,
 751                             strb->rtt_level,
 752                             strb->rtt_face + strb->rtt_slice,
 753                             usage, x, y2, w, h, &strb->transfer);
 754    if (map) {
 755       if (invert) {
 756          *rowStrideOut = -(int) strb->transfer->stride;
 757          map += (h - 1) * strb->transfer->stride;
 758       }
 759       else {
 760          *rowStrideOut = strb->transfer->stride;
 761       }
 762       *mapOut = map;
 763    }
 764    else {
 765       *mapOut = NULL;
 766       *rowStrideOut = 0;
 767    }
 768 }
 769
 770
 771 /**
 772  * Called via ctx->Driver.UnmapRenderbuffer.
 773  */
 774 static void
 775 st_UnmapRenderbuffer(struct gl_context *ctx,
 776                      struct gl_renderbuffer *rb)
 777 {
 778    struct st_context *st = st_context(ctx);
 779    struct st_renderbuffer *strb = st_renderbuffer(rb);
 780    struct pipe_context *pipe = st->pipe;
 781
 782    if (strb->software) {
 783       /* software-allocated renderbuffer (probably an accum buffer) */
 784       return;
 785    }
 786
 787    pipe_transfer_unmap(pipe, strb->transfer);
 788    strb->transfer = NULL;
 789 }
 790
 791
 792
 793 void st_init_fbo_functions(struct dd_function_table *functions)
 794 {
 795    functions->NewFramebuffer = st_new_framebuffer;
 796    functions->NewRenderbuffer = st_new_renderbuffer;
 797    functions->BindFramebuffer = st_bind_framebuffer;
 798    functions->FramebufferRenderbuffer = _mesa_framebuffer_renderbuffer;
 799    functions->RenderTexture = st_render_texture;
 800    functions->FinishRenderTexture = st_finish_render_texture;
 801    functions->ValidateFramebuffer = st_validate_framebuffer;
 802
 803    functions->DrawBuffers = st_DrawBuffers;
 804    functions->ReadBuffer = st_ReadBuffer;
 805
 806    functions->MapRenderbuffer = st_MapRenderbuffer;
 807    functions->UnmapRenderbuffer = st_UnmapRenderbuffer;
 808 }
 809
 810