src/mesa/state_tracker/st_cb_fbo.c

   1 /**************************************************************************
   2  *
   3  * Copyright 2007 VMware, Inc.
   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 VMWARE 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/glformats.h"
  41 #include "main/macros.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_atom.h"
  48 #include "st_context.h"
  49 #include "st_cb_fbo.h"
  50 #include "st_cb_flush.h"
  51 #include "st_cb_texture.h"
  52 #include "st_format.h"
  53 #include "st_texture.h"
  54 #include "st_manager.h"
  55
  56 #include "util/u_format.h"
  57 #include "util/u_inlines.h"
  58 #include "util/u_surface.h"
  59
  60
  61 static GLboolean
  62 st_renderbuffer_alloc_sw_storage(struct gl_context * ctx,
  63                                  struct gl_renderbuffer *rb,
  64                                  GLenum internalFormat,
  65                                  GLuint width, GLuint height)
  66 {
  67    struct st_context *st = st_context(ctx);
  68    struct st_renderbuffer *strb = st_renderbuffer(rb);
  69    enum pipe_format format;
  70    size_t size;
  71
  72    free(strb->data);
  73    strb->data = NULL;
  74
  75    if (internalFormat == GL_RGBA16_SNORM) {
  76       /* Special case for software accum buffers.  Otherwise, if the
  77        * call to st_choose_renderbuffer_format() fails (because the
  78        * driver doesn't support signed 16-bit/channel colors) we'd
  79        * just return without allocating the software accum buffer.
  80        */
  81       format = PIPE_FORMAT_R16G16B16A16_SNORM;
  82    }
  83    else {
  84       format = st_choose_renderbuffer_format(st, internalFormat, 0);
  85
  86       /* Not setting gl_renderbuffer::Format here will cause
  87        * FRAMEBUFFER_UNSUPPORTED and ValidateFramebuffer will not be called.
  88        */
  89       if (format == PIPE_FORMAT_NONE) {
  90          return GL_TRUE;
  91       }
  92    }
  93
  94    strb->Base.Format = st_pipe_format_to_mesa_format(format);
  95
  96    size = _mesa_format_image_size(strb->Base.Format, width, height, 1);
  97    strb->data = malloc(size);
  98    return strb->data != NULL;
  99 }
 100
 101
 102 /**
 103  * gl_renderbuffer::AllocStorage()
 104  * This is called to allocate the original drawing surface, and
 105  * during window resize.
 106  */
 107 static GLboolean
 108 st_renderbuffer_alloc_storage(struct gl_context * ctx,
 109                               struct gl_renderbuffer *rb,
 110                               GLenum internalFormat,
 111                               GLuint width, GLuint height)
 112 {
 113    struct st_context *st = st_context(ctx);
 114    struct pipe_context *pipe = st->pipe;
 115    struct pipe_screen *screen = st->pipe->screen;
 116    struct st_renderbuffer *strb = st_renderbuffer(rb);
 117    enum pipe_format format = PIPE_FORMAT_NONE;
 118    struct pipe_surface surf_tmpl;
 119    struct pipe_resource templ;
 120
 121    /* init renderbuffer fields */
 122    strb->Base.Width  = width;
 123    strb->Base.Height = height;
 124    strb->Base._BaseFormat = _mesa_base_fbo_format(ctx, internalFormat);
 125    strb->defined = GL_FALSE;  /* undefined contents now */
 126
 127    if (strb->software) {
 128       return st_renderbuffer_alloc_sw_storage(ctx, rb, internalFormat,
 129                                               width, height);
 130    }
 131
 132    /* Free the old surface and texture
 133     */
 134    pipe_surface_reference( &strb->surface, NULL );
 135    pipe_resource_reference( &strb->texture, NULL );
 136
 137    /* If an sRGB framebuffer is unsupported, sRGB formats behave like linear
 138     * formats.
 139     */
 140    if (!ctx->Extensions.EXT_framebuffer_sRGB) {
 141       internalFormat = _mesa_get_linear_internalformat(internalFormat);
 142    }
 143
 144    /* Handle multisample renderbuffers first.
 145     *
 146     * From ARB_framebuffer_object:
 147     *   If <samples> is zero, then RENDERBUFFER_SAMPLES is set to zero.
 148     *   Otherwise <samples> represents a request for a desired minimum
 149     *   number of samples. Since different implementations may support
 150     *   different sample counts for multisampled rendering, the actual
 151     *   number of samples allocated for the renderbuffer image is
 152     *   implementation dependent.  However, the resulting value for
 153     *   RENDERBUFFER_SAMPLES is guaranteed to be greater than or equal
 154     *   to <samples> and no more than the next larger sample count supported
 155     *   by the implementation.
 156     *
 157     * So let's find the supported number of samples closest to NumSamples.
 158     * (NumSamples == 1) is treated the same as (NumSamples == 0).
 159     */
 160    if (rb->NumSamples > 1) {
 161       unsigned i;
 162
 163       for (i = rb->NumSamples; i <= ctx->Const.MaxSamples; i++) {
 164          format = st_choose_renderbuffer_format(st, internalFormat, i);
 165
 166          if (format != PIPE_FORMAT_NONE) {
 167             rb->NumSamples = i;
 168             break;
 169          }
 170       }
 171    } else {
 172       format = st_choose_renderbuffer_format(st, internalFormat, 0);
 173    }
 174
 175    /* Not setting gl_renderbuffer::Format here will cause
 176     * FRAMEBUFFER_UNSUPPORTED and ValidateFramebuffer will not be called.
 177     */
 178    if (format == PIPE_FORMAT_NONE) {
 179       return GL_TRUE;
 180    }
 181
 182    strb->Base.Format = st_pipe_format_to_mesa_format(format);
 183
 184    if (width == 0 || height == 0) {
 185       /* if size is zero, nothing to allocate */
 186       return GL_TRUE;
 187    }
 188
 189    /* Setup new texture template.
 190     */
 191    memset(&templ, 0, sizeof(templ));
 192    templ.target = st->internal_target;
 193    templ.format = format;
 194    templ.width0 = width;
 195    templ.height0 = height;
 196    templ.depth0 = 1;
 197    templ.array_size = 1;
 198    templ.nr_samples = rb->NumSamples;
 199    if (util_format_is_depth_or_stencil(format)) {
 200       templ.bind = PIPE_BIND_DEPTH_STENCIL;
 201    }
 202    else if (strb->Base.Name != 0) {
 203       /* this is a user-created renderbuffer */
 204       templ.bind = PIPE_BIND_RENDER_TARGET;
 205    }
 206    else {
 207       /* this is a window-system buffer */
 208       templ.bind = (PIPE_BIND_DISPLAY_TARGET |
 209                     PIPE_BIND_RENDER_TARGET);
 210    }
 211
 212    strb->texture = screen->resource_create(screen, &templ);
 213
 214    if (!strb->texture)
 215       return FALSE;
 216
 217    u_surface_default_template(&surf_tmpl, strb->texture);
 218    strb->surface = pipe->create_surface(pipe,
 219                                         strb->texture,
 220                                         &surf_tmpl);
 221    if (strb->surface) {
 222       assert(strb->surface->texture);
 223       assert(strb->surface->format);
 224       assert(strb->surface->width == width);
 225       assert(strb->surface->height == height);
 226    }
 227
 228    return strb->surface != NULL;
 229 }
 230
 231
 232 /**
 233  * gl_renderbuffer::Delete()
 234  */
 235 static void
 236 st_renderbuffer_delete(struct gl_context *ctx, struct gl_renderbuffer *rb)
 237 {
 238    struct st_renderbuffer *strb = st_renderbuffer(rb);
 239    if (ctx) {
 240       struct st_context *st = st_context(ctx);
 241       pipe_surface_release(st->pipe, &strb->surface);
 242    }
 243    pipe_resource_reference(&strb->texture, NULL);
 244    free(strb->data);
 245    _mesa_delete_renderbuffer(ctx, rb);
 246 }
 247
 248
 249 /**
 250  * Called via ctx->Driver.NewRenderbuffer()
 251  */
 252 static struct gl_renderbuffer *
 253 st_new_renderbuffer(struct gl_context *ctx, GLuint name)
 254 {
 255    struct st_renderbuffer *strb = ST_CALLOC_STRUCT(st_renderbuffer);
 256    if (strb) {
 257       assert(name != 0);
 258       _mesa_init_renderbuffer(&strb->Base, name);
 259       strb->Base.Delete = st_renderbuffer_delete;
 260       strb->Base.AllocStorage = st_renderbuffer_alloc_storage;
 261       return &strb->Base;
 262    }
 263    return NULL;
 264 }
 265
 266
 267 /**
 268  * Allocate a renderbuffer for a an on-screen window (not a user-created
 269  * renderbuffer).  The window system code determines the format.
 270  */
 271 struct gl_renderbuffer *
 272 st_new_renderbuffer_fb(enum pipe_format format, int samples, boolean sw)
 273 {
 274    struct st_renderbuffer *strb;
 275
 276    strb = ST_CALLOC_STRUCT(st_renderbuffer);
 277    if (!strb) {
 278       _mesa_error(NULL, GL_OUT_OF_MEMORY, "creating renderbuffer");
 279       return NULL;
 280    }
 281
 282    _mesa_init_renderbuffer(&strb->Base, 0);
 283    strb->Base.ClassID = 0x4242; /* just a unique value */
 284    strb->Base.NumSamples = samples;
 285    strb->Base.Format = st_pipe_format_to_mesa_format(format);
 286    strb->Base._BaseFormat = _mesa_get_format_base_format(strb->Base.Format);
 287    strb->software = sw;
 288
 289    switch (format) {
 290    case PIPE_FORMAT_R8G8B8A8_UNORM:
 291    case PIPE_FORMAT_B8G8R8A8_UNORM:
 292    case PIPE_FORMAT_A8R8G8B8_UNORM:
 293       strb->Base.InternalFormat = GL_RGBA8;
 294       break;
 295    case PIPE_FORMAT_R8G8B8X8_UNORM:
 296    case PIPE_FORMAT_B8G8R8X8_UNORM:
 297    case PIPE_FORMAT_X8R8G8B8_UNORM:
 298       strb->Base.InternalFormat = GL_RGB8;
 299       break;
 300    case PIPE_FORMAT_R8G8B8A8_SRGB:
 301    case PIPE_FORMAT_B8G8R8A8_SRGB:
 302    case PIPE_FORMAT_A8R8G8B8_SRGB:
 303       strb->Base.InternalFormat = GL_SRGB8_ALPHA8;
 304       break;
 305    case PIPE_FORMAT_R8G8B8X8_SRGB:
 306    case PIPE_FORMAT_B8G8R8X8_SRGB:
 307    case PIPE_FORMAT_X8R8G8B8_SRGB:
 308       strb->Base.InternalFormat = GL_SRGB8;
 309       break;
 310    case PIPE_FORMAT_B5G5R5A1_UNORM:
 311       strb->Base.InternalFormat = GL_RGB5_A1;
 312       break;
 313    case PIPE_FORMAT_B4G4R4A4_UNORM:
 314       strb->Base.InternalFormat = GL_RGBA4;
 315       break;
 316    case PIPE_FORMAT_B5G6R5_UNORM:
 317       strb->Base.InternalFormat = GL_RGB565;
 318       break;
 319    case PIPE_FORMAT_Z16_UNORM:
 320       strb->Base.InternalFormat = GL_DEPTH_COMPONENT16;
 321       break;
 322    case PIPE_FORMAT_Z32_UNORM:
 323       strb->Base.InternalFormat = GL_DEPTH_COMPONENT32;
 324       break;
 325    case PIPE_FORMAT_Z24_UNORM_S8_UINT:
 326    case PIPE_FORMAT_S8_UINT_Z24_UNORM:
 327       strb->Base.InternalFormat = GL_DEPTH24_STENCIL8_EXT;
 328       break;
 329    case PIPE_FORMAT_Z24X8_UNORM:
 330    case PIPE_FORMAT_X8Z24_UNORM:
 331       strb->Base.InternalFormat = GL_DEPTH_COMPONENT24;
 332       break;
 333    case PIPE_FORMAT_S8_UINT:
 334       strb->Base.InternalFormat = GL_STENCIL_INDEX8_EXT;
 335       break;
 336    case PIPE_FORMAT_R16G16B16A16_SNORM:
 337       /* accum buffer */
 338       strb->Base.InternalFormat = GL_RGBA16_SNORM;
 339       break;
 340    case PIPE_FORMAT_R16G16B16A16_UNORM:
 341       strb->Base.InternalFormat = GL_RGBA16;
 342       break;
 343    case PIPE_FORMAT_R8_UNORM:
 344       strb->Base.InternalFormat = GL_R8;
 345       break;
 346    case PIPE_FORMAT_R8G8_UNORM:
 347       strb->Base.InternalFormat = GL_RG8;
 348       break;
 349    case PIPE_FORMAT_R16_UNORM:
 350       strb->Base.InternalFormat = GL_R16;
 351       break;
 352    case PIPE_FORMAT_R16G16_UNORM:
 353       strb->Base.InternalFormat = GL_RG16;
 354       break;
 355    case PIPE_FORMAT_R32G32B32A32_FLOAT:
 356       strb->Base.InternalFormat = GL_RGBA32F;
 357       break;
 358    case PIPE_FORMAT_R16G16B16A16_FLOAT:
 359       strb->Base.InternalFormat = GL_RGBA16F;
 360       break;
 361    default:
 362       _mesa_problem(NULL,
 363                     "Unexpected format %s in st_new_renderbuffer_fb",
 364                     util_format_name(format));
 365       free(strb);
 366       return NULL;
 367    }
 368
 369    /* st-specific methods */
 370    strb->Base.Delete = st_renderbuffer_delete;
 371    strb->Base.AllocStorage = st_renderbuffer_alloc_storage;
 372
 373    /* surface is allocated in st_renderbuffer_alloc_storage() */
 374    strb->surface = NULL;
 375
 376    return &strb->Base;
 377 }
 378
 379
 380 /**
 381  * Create or update the pipe_surface of a FBO renderbuffer.
 382  * This is usually called after st_finalize_texture.
 383  */
 384 void
 385 st_update_renderbuffer_surface(struct st_context *st,
 386                                struct st_renderbuffer *strb)
 387 {
 388    struct pipe_context *pipe = st->pipe;
 389    struct pipe_resource *resource = strb->texture;
 390    unsigned rtt_width = strb->Base.Width;
 391    unsigned rtt_height = strb->Base.Height;
 392    unsigned rtt_depth = strb->Base.Depth;
 393    /*
 394     * For winsys fbo, it is possible that the renderbuffer is sRGB-capable but
 395     * the format of strb->texture is linear (because we have no control over
 396     * the format).  Check strb->Base.Format instead of strb->texture->format
 397     * to determine if the rb is sRGB-capable.
 398     */
 399    boolean enable_srgb = (st->ctx->Color.sRGBEnabled &&
 400          _mesa_get_format_color_encoding(strb->Base.Format) == GL_SRGB);
 401    enum pipe_format format = (enable_srgb) ?
 402       util_format_srgb(resource->format) :
 403       util_format_linear(resource->format);
 404    unsigned first_layer, last_layer, level;
 405
 406    if (resource->target == PIPE_TEXTURE_1D_ARRAY) {
 407       rtt_depth = rtt_height;
 408       rtt_height = 1;
 409    }
 410
 411    /* find matching mipmap level size */
 412    for (level = 0; level <= resource->last_level; level++) {
 413       if (u_minify(resource->width0, level) == rtt_width &&
 414           u_minify(resource->height0, level) == rtt_height &&
 415           (resource->target != PIPE_TEXTURE_3D ||
 416            u_minify(resource->depth0, level) == rtt_depth)) {
 417          break;
 418       }
 419    }
 420    assert(level <= resource->last_level);
 421
 422    /* determine the layer bounds */
 423    if (strb->rtt_layered) {
 424       first_layer = 0;
 425       last_layer = util_max_layer(strb->texture, level);
 426    }
 427    else {
 428       first_layer =
 429       last_layer = strb->rtt_face + strb->rtt_slice;
 430    }
 431
 432    /* Adjust for texture views */
 433    if (strb->is_rtt && resource->array_size > 1 &&
 434        strb->Base.TexImage->TexObject->Immutable) {
 435       struct gl_texture_object *tex = strb->Base.TexImage->TexObject;
 436       first_layer += tex->MinLayer;
 437       if (!strb->rtt_layered)
 438          last_layer += tex->MinLayer;
 439       else
 440          last_layer = MIN2(first_layer + tex->NumLayers - 1, last_layer);
 441    }
 442
 443    if (!strb->surface ||
 444        strb->surface->texture->nr_samples != strb->Base.NumSamples ||
 445        strb->surface->format != format ||
 446        strb->surface->texture != resource ||
 447        strb->surface->width != rtt_width ||
 448        strb->surface->height != rtt_height ||
 449        strb->surface->u.tex.level != level ||
 450        strb->surface->u.tex.first_layer != first_layer ||
 451        strb->surface->u.tex.last_layer != last_layer) {
 452       /* create a new pipe_surface */
 453       struct pipe_surface surf_tmpl;
 454       memset(&surf_tmpl, 0, sizeof(surf_tmpl));
 455       surf_tmpl.format = format;
 456       surf_tmpl.u.tex.level = level;
 457       surf_tmpl.u.tex.first_layer = first_layer;
 458       surf_tmpl.u.tex.last_layer = last_layer;
 459
 460       pipe_surface_release(pipe, &strb->surface);
 461
 462       strb->surface = pipe->create_surface(pipe, resource, &surf_tmpl);
 463    }
 464 }
 465
 466 /**
 467  * Called by ctx->Driver.RenderTexture
 468  */
 469 static void
 470 st_render_texture(struct gl_context *ctx,
 471                   struct gl_framebuffer *fb,
 472                   struct gl_renderbuffer_attachment *att)
 473 {
 474    struct st_context *st = st_context(ctx);
 475    struct pipe_context *pipe = st->pipe;
 476    struct gl_renderbuffer *rb = att->Renderbuffer;
 477    struct st_renderbuffer *strb = st_renderbuffer(rb);
 478    struct pipe_resource *pt;
 479
 480    if (!st_finalize_texture(ctx, pipe, att->Texture))
 481       return;
 482
 483    pt = st_get_texobj_resource(att->Texture);
 484    assert(pt);
 485
 486    /* point renderbuffer at texobject */
 487    strb->is_rtt = TRUE;
 488    strb->rtt_face = att->CubeMapFace;
 489    strb->rtt_slice = att->Zoffset;
 490    strb->rtt_layered = att->Layered;
 491    pipe_resource_reference(&strb->texture, pt);
 492
 493    st_update_renderbuffer_surface(st, strb);
 494
 495    strb->Base.Format = st_pipe_format_to_mesa_format(pt->format);
 496
 497    /* Invalidate buffer state so that the pipe's framebuffer state
 498     * gets updated.
 499     * That's where the new renderbuffer (which we just created) gets
 500     * passed to the pipe as a (color/depth) render target.
 501     */
 502    st_invalidate_state(ctx, _NEW_BUFFERS);
 503
 504
 505    /* Need to trigger a call to update_framebuffer() since we just
 506     * attached a new renderbuffer.
 507     */
 508    ctx->NewState |= _NEW_BUFFERS;
 509 }
 510
 511
 512 /**
 513  * Called via ctx->Driver.FinishRenderTexture.
 514  */
 515 static void
 516 st_finish_render_texture(struct gl_context *ctx, struct gl_renderbuffer *rb)
 517 {
 518    struct st_renderbuffer *strb = st_renderbuffer(rb);
 519
 520    if (!strb)
 521       return;
 522
 523    strb->is_rtt = FALSE;
 524
 525    /* restore previous framebuffer state */
 526    st_invalidate_state(ctx, _NEW_BUFFERS);
 527 }
 528
 529
 530 /** Debug helper */
 531 static void
 532 st_fbo_invalid(const char *reason)
 533 {
 534    if (MESA_DEBUG_FLAGS & DEBUG_INCOMPLETE_FBO) {
 535       _mesa_debug(NULL, "Invalid FBO: %s\n", reason);
 536    }
 537 }
 538
 539
 540 /**
 541  * Validate a renderbuffer attachment for a particular set of bindings.
 542  */
 543 static GLboolean
 544 st_validate_attachment(struct gl_context *ctx,
 545                        struct pipe_screen *screen,
 546                        const struct gl_renderbuffer_attachment *att,
 547                        unsigned bindings)
 548 {
 549    const struct st_texture_object *stObj = st_texture_object(att->Texture);
 550    enum pipe_format format;
 551    mesa_format texFormat;
 552    GLboolean valid;
 553
 554    /* Sanity check: we must be binding the surface as a (color) render target
 555     * or depth/stencil target.
 556     */
 557    assert(bindings == PIPE_BIND_RENDER_TARGET ||
 558           bindings == PIPE_BIND_DEPTH_STENCIL);
 559
 560    /* Only validate texture attachments for now, since
 561     * st_renderbuffer_alloc_storage makes sure that
 562     * the format is supported.
 563     */
 564    if (att->Type != GL_TEXTURE)
 565       return GL_TRUE;
 566
 567    if (!stObj || !stObj->pt)
 568       return GL_FALSE;
 569
 570    format = stObj->pt->format;
 571    texFormat = att->Renderbuffer->TexImage->TexFormat;
 572
 573    /* If the encoding is sRGB and sRGB rendering cannot be enabled,
 574     * check for linear format support instead.
 575     * Later when we create a surface, we change the format to a linear one. */
 576    if (!ctx->Extensions.EXT_framebuffer_sRGB &&
 577        _mesa_get_format_color_encoding(texFormat) == GL_SRGB) {
 578       const mesa_format linearFormat = _mesa_get_srgb_format_linear(texFormat);
 579       format = st_mesa_format_to_pipe_format(st_context(ctx), linearFormat);
 580    }
 581
 582    valid = screen->is_format_supported(screen, format,
 583                                       PIPE_TEXTURE_2D,
 584                                       stObj->pt->nr_samples, bindings);
 585    if (!valid) {
 586       st_fbo_invalid("Invalid format");
 587    }
 588
 589    return valid;
 590 }
 591
 592
 593 /**
 594  * Check that the framebuffer configuration is valid in terms of what
 595  * the driver can support.
 596  *
 597  * For Gallium we only supports combined Z+stencil, not separate buffers.
 598  */
 599 static void
 600 st_validate_framebuffer(struct gl_context *ctx, struct gl_framebuffer *fb)
 601 {
 602    struct st_context *st = st_context(ctx);
 603    struct pipe_screen *screen = st->pipe->screen;
 604    const struct gl_renderbuffer_attachment *depth =
 605          &fb->Attachment[BUFFER_DEPTH];
 606    const struct gl_renderbuffer_attachment *stencil =
 607          &fb->Attachment[BUFFER_STENCIL];
 608    GLuint i;
 609    enum pipe_format first_format = PIPE_FORMAT_NONE;
 610    boolean mixed_formats =
 611          screen->get_param(screen, PIPE_CAP_MIXED_COLORBUFFER_FORMATS) != 0;
 612
 613    if (depth->Type && stencil->Type && depth->Type != stencil->Type) {
 614       st_fbo_invalid("Different Depth/Stencil buffer formats");
 615       fb->_Status = GL_FRAMEBUFFER_UNSUPPORTED_EXT;
 616       return;
 617    }
 618    if (depth->Type == GL_RENDERBUFFER_EXT &&
 619        stencil->Type == GL_RENDERBUFFER_EXT &&
 620        depth->Renderbuffer != stencil->Renderbuffer) {
 621       st_fbo_invalid("Separate Depth/Stencil buffers");
 622       fb->_Status = GL_FRAMEBUFFER_UNSUPPORTED_EXT;
 623       return;
 624    }
 625    if (depth->Type == GL_TEXTURE &&
 626        stencil->Type == GL_TEXTURE &&
 627        depth->Texture != stencil->Texture) {
 628       fb->_Status = GL_FRAMEBUFFER_UNSUPPORTED_EXT;
 629       st_fbo_invalid("Different Depth/Stencil textures");
 630       return;
 631    }
 632
 633    if (!st_validate_attachment(ctx,
 634                                screen,
 635                                depth,
 636                                PIPE_BIND_DEPTH_STENCIL)) {
 637       fb->_Status = GL_FRAMEBUFFER_UNSUPPORTED_EXT;
 638       return;
 639    }
 640    if (!st_validate_attachment(ctx,
 641                                screen,
 642                                stencil,
 643                                PIPE_BIND_DEPTH_STENCIL)) {
 644       fb->_Status = GL_FRAMEBUFFER_UNSUPPORTED_EXT;
 645       return;
 646    }
 647    for (i = 0; i < ctx->Const.MaxColorAttachments; i++) {
 648       struct gl_renderbuffer_attachment *att =
 649             &fb->Attachment[BUFFER_COLOR0 + i];
 650       enum pipe_format format;
 651
 652       if (!st_validate_attachment(ctx,
 653                                   screen,
 654                                   att,
 655                                   PIPE_BIND_RENDER_TARGET)) {
 656          fb->_Status = GL_FRAMEBUFFER_UNSUPPORTED_EXT;
 657          return;
 658       }
 659
 660       if (!mixed_formats) {
 661          /* Disallow mixed formats. */
 662          if (att->Type != GL_NONE) {
 663             format = st_renderbuffer(att->Renderbuffer)->surface->format;
 664          } else {
 665             continue;
 666          }
 667
 668          if (first_format == PIPE_FORMAT_NONE) {
 669             first_format = format;
 670          } else if (format != first_format) {
 671             fb->_Status = GL_FRAMEBUFFER_UNSUPPORTED_EXT;
 672             st_fbo_invalid("Mixed color formats");
 673             return;
 674          }
 675       }
 676    }
 677 }
 678
 679
 680 /**
 681  * Called via glDrawBuffer.
 682  */
 683 static void
 684 st_DrawBuffers(struct gl_context *ctx, GLsizei count, const GLenum *buffers)
 685 {
 686    struct st_context *st = st_context(ctx);
 687    struct gl_framebuffer *fb = ctx->DrawBuffer;
 688    GLuint i;
 689
 690    (void) count;
 691    (void) buffers;
 692
 693    /* add the renderbuffers on demand */
 694    for (i = 0; i < fb->_NumColorDrawBuffers; i++) {
 695       gl_buffer_index idx = fb->_ColorDrawBufferIndexes[i];
 696
 697       if (idx >= 0) {
 698          st_manager_add_color_renderbuffer(st, fb, idx);
 699       }
 700    }
 701 }
 702
 703
 704 /**
 705  * Called via glReadBuffer.
 706  */
 707 static void
 708 st_ReadBuffer(struct gl_context *ctx, GLenum buffer)
 709 {
 710    struct st_context *st = st_context(ctx);
 711    struct gl_framebuffer *fb = ctx->ReadBuffer;
 712
 713    (void) buffer;
 714
 715    /* Check if we need to allocate a front color buffer.
 716     * Front buffers are often allocated on demand (other color buffers are
 717     * always allocated in advance).
 718     */
 719    if ((fb->_ColorReadBufferIndex == BUFFER_FRONT_LEFT ||
 720         fb->_ColorReadBufferIndex == BUFFER_FRONT_RIGHT) &&
 721        fb->Attachment[fb->_ColorReadBufferIndex].Type == GL_NONE) {
 722       /* add the buffer */
 723       st_manager_add_color_renderbuffer(st, fb, fb->_ColorReadBufferIndex);
 724       st_validate_state(st, ST_PIPELINE_RENDER);
 725    }
 726 }
 727
 728
 729
 730 /**
 731  * Called via ctx->Driver.MapRenderbuffer.
 732  */
 733 static void
 734 st_MapRenderbuffer(struct gl_context *ctx,
 735                    struct gl_renderbuffer *rb,
 736                    GLuint x, GLuint y, GLuint w, GLuint h,
 737                    GLbitfield mode,
 738                    GLubyte **mapOut, GLint *rowStrideOut)
 739 {
 740    struct st_context *st = st_context(ctx);
 741    struct st_renderbuffer *strb = st_renderbuffer(rb);
 742    struct pipe_context *pipe = st->pipe;
 743    const GLboolean invert = rb->Name == 0;
 744    unsigned usage;
 745    GLuint y2;
 746    GLubyte *map;
 747
 748    if (strb->software) {
 749       /* software-allocated renderbuffer (probably an accum buffer) */
 750       if (strb->data) {
 751          GLint bpp = _mesa_get_format_bytes(strb->Base.Format);
 752          GLint stride = _mesa_format_row_stride(strb->Base.Format,
 753                                                 strb->Base.Width);
 754          *mapOut = (GLubyte *) strb->data + y * stride + x * bpp;
 755          *rowStrideOut = stride;
 756       }
 757       else {
 758          *mapOut = NULL;
 759          *rowStrideOut = 0;
 760       }
 761       return;
 762    }
 763
 764    usage = 0x0;
 765    if (mode & GL_MAP_READ_BIT)
 766       usage |= PIPE_TRANSFER_READ;
 767    if (mode & GL_MAP_WRITE_BIT)
 768       usage |= PIPE_TRANSFER_WRITE;
 769    if (mode & GL_MAP_INVALIDATE_RANGE_BIT)
 770       usage |= PIPE_TRANSFER_DISCARD_RANGE;
 771
 772    /* Note: y=0=bottom of buffer while y2=0=top of buffer.
 773     * 'invert' will be true for window-system buffers and false for
 774     * user-allocated renderbuffers and textures.
 775     */
 776    if (invert)
 777       y2 = strb->Base.Height - y - h;
 778    else
 779       y2 = y;
 780
 781     map = pipe_transfer_map(pipe,
 782                             strb->texture,
 783                             strb->surface->u.tex.level,
 784                             strb->surface->u.tex.first_layer,
 785                             usage, x, y2, w, h, &strb->transfer);
 786    if (map) {
 787       if (invert) {
 788          *rowStrideOut = -(int) strb->transfer->stride;
 789          map += (h - 1) * strb->transfer->stride;
 790       }
 791       else {
 792          *rowStrideOut = strb->transfer->stride;
 793       }
 794       *mapOut = map;
 795    }
 796    else {
 797       *mapOut = NULL;
 798       *rowStrideOut = 0;
 799    }
 800 }
 801
 802
 803 /**
 804  * Called via ctx->Driver.UnmapRenderbuffer.
 805  */
 806 static void
 807 st_UnmapRenderbuffer(struct gl_context *ctx,
 808                      struct gl_renderbuffer *rb)
 809 {
 810    struct st_context *st = st_context(ctx);
 811    struct st_renderbuffer *strb = st_renderbuffer(rb);
 812    struct pipe_context *pipe = st->pipe;
 813
 814    if (strb->software) {
 815       /* software-allocated renderbuffer (probably an accum buffer) */
 816       return;
 817    }
 818
 819    pipe_transfer_unmap(pipe, strb->transfer);
 820    strb->transfer = NULL;
 821 }
 822
 823
 824
 825 void st_init_fbo_functions(struct dd_function_table *functions)
 826 {
 827    functions->NewFramebuffer = _mesa_new_framebuffer;
 828    functions->NewRenderbuffer = st_new_renderbuffer;
 829    functions->FramebufferRenderbuffer = _mesa_FramebufferRenderbuffer_sw;
 830    functions->RenderTexture = st_render_texture;
 831    functions->FinishRenderTexture = st_finish_render_texture;
 832    functions->ValidateFramebuffer = st_validate_framebuffer;
 833
 834    functions->DrawBuffers = st_DrawBuffers;
 835    functions->ReadBuffer = st_ReadBuffer;
 836
 837    functions->MapRenderbuffer = st_MapRenderbuffer;
 838    functions->UnmapRenderbuffer = st_UnmapRenderbuffer;
 839 }
 840
 841