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 #include "main/state.h"
  44
  45 #include "pipe/p_context.h"
  46 #include "pipe/p_defines.h"
  47 #include "pipe/p_screen.h"
  48 #include "st_atom.h"
  49 #include "st_context.h"
  50 #include "st_cb_bufferobjects.h"
  51 #include "st_cb_fbo.h"
  52 #include "st_cb_flush.h"
  53 #include "st_cb_texture.h"
  54 #include "st_format.h"
  55 #include "st_texture.h"
  56 #include "st_manager.h"
  57
  58 #include "util/u_format.h"
  59 #include "util/u_inlines.h"
  60 #include "util/u_surface.h"
  61
  62
  63 static GLboolean
  64 st_renderbuffer_alloc_sw_storage(struct gl_context * ctx,
  65                                  struct gl_renderbuffer *rb,
  66                                  GLenum internalFormat,
  67                                  GLuint width, GLuint height)
  68 {
  69    struct st_context *st = st_context(ctx);
  70    struct st_renderbuffer *strb = st_renderbuffer(rb);
  71    enum pipe_format format;
  72    size_t size;
  73
  74    free(strb->data);
  75    strb->data = NULL;
  76
  77    if (internalFormat == GL_RGBA16_SNORM) {
  78       /* Special case for software accum buffers.  Otherwise, if the
  79        * call to st_choose_renderbuffer_format() fails (because the
  80        * driver doesn't support signed 16-bit/channel colors) we'd
  81        * just return without allocating the software accum buffer.
  82        */
  83       format = PIPE_FORMAT_R16G16B16A16_SNORM;
  84    }
  85    else {
  86       format = st_choose_renderbuffer_format(st, internalFormat, 0, 0);
  87
  88       /* Not setting gl_renderbuffer::Format here will cause
  89        * FRAMEBUFFER_UNSUPPORTED and ValidateFramebuffer will not be called.
  90        */
  91       if (format == PIPE_FORMAT_NONE) {
  92          return GL_TRUE;
  93       }
  94    }
  95
  96    strb->Base.Format = st_pipe_format_to_mesa_format(format);
  97
  98    size = _mesa_format_image_size(strb->Base.Format, width, height, 1);
  99    strb->data = malloc(size);
 100    return strb->data != NULL;
 101 }
 102
 103
 104 /**
 105  * gl_renderbuffer::AllocStorage()
 106  * This is called to allocate the original drawing surface, and
 107  * during window resize.
 108  */
 109 static GLboolean
 110 st_renderbuffer_alloc_storage(struct gl_context * ctx,
 111                               struct gl_renderbuffer *rb,
 112                               GLenum internalFormat,
 113                               GLuint width, GLuint height)
 114 {
 115    struct st_context *st = st_context(ctx);
 116    struct pipe_screen *screen = st->pipe->screen;
 117    struct st_renderbuffer *strb = st_renderbuffer(rb);
 118    enum pipe_format format = PIPE_FORMAT_NONE;
 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_srgb, NULL);
 135    pipe_surface_reference(&strb->surface_linear, NULL);
 136    strb->surface = NULL;
 137    pipe_resource_reference(&strb->texture, NULL);
 138
 139    /* If an sRGB framebuffer is unsupported, sRGB formats behave like linear
 140     * formats.
 141     */
 142    if (!ctx->Extensions.EXT_framebuffer_sRGB) {
 143       internalFormat = _mesa_get_linear_internalformat(internalFormat);
 144    }
 145
 146    /* Handle multisample renderbuffers first.
 147     *
 148     * From ARB_framebuffer_object:
 149     *   If <samples> is zero, then RENDERBUFFER_SAMPLES is set to zero.
 150     *   Otherwise <samples> represents a request for a desired minimum
 151     *   number of samples. Since different implementations may support
 152     *   different sample counts for multisampled rendering, the actual
 153     *   number of samples allocated for the renderbuffer image is
 154     *   implementation dependent.  However, the resulting value for
 155     *   RENDERBUFFER_SAMPLES is guaranteed to be greater than or equal
 156     *   to <samples> and no more than the next larger sample count supported
 157     *   by the implementation.
 158     *
 159     * Find the supported number of samples >= rb->NumSamples
 160     */
 161    if (rb->NumSamples > 0) {
 162       unsigned start, start_storage;
 163
 164       if (ctx->Const.MaxSamples > 1 &&  rb->NumSamples == 1) {
 165          /* don't try num_samples = 1 with drivers that support real msaa */
 166          start = 2;
 167          start_storage = 2;
 168       } else {
 169          start = rb->NumSamples;
 170          start_storage = rb->NumStorageSamples;
 171       }
 172
 173       if (ctx->Extensions.AMD_framebuffer_multisample_advanced) {
 174          if (rb->_BaseFormat == GL_DEPTH_COMPONENT ||
 175              rb->_BaseFormat == GL_DEPTH_STENCIL ||
 176              rb->_BaseFormat == GL_STENCIL_INDEX) {
 177             /* Find a supported depth-stencil format. */
 178             for (unsigned samples = start;
 179                  samples <= ctx->Const.MaxDepthStencilFramebufferSamples;
 180                  samples++) {
 181                format = st_choose_renderbuffer_format(st, internalFormat,
 182                                                       samples, samples);
 183
 184                if (format != PIPE_FORMAT_NONE) {
 185                   rb->NumSamples = samples;
 186                   rb->NumStorageSamples = samples;
 187                   break;
 188                }
 189             }
 190          } else {
 191             /* Find a supported color format, samples >= storage_samples. */
 192             for (unsigned storage_samples = start_storage;
 193                  storage_samples <= ctx->Const.MaxColorFramebufferStorageSamples;
 194                  storage_samples++) {
 195                for (unsigned samples = MAX2(start, storage_samples);
 196                     samples <= ctx->Const.MaxColorFramebufferSamples;
 197                     samples++) {
 198                   format = st_choose_renderbuffer_format(st, internalFormat,
 199                                                          samples,
 200                                                          storage_samples);
 201
 202                   if (format != PIPE_FORMAT_NONE) {
 203                      rb->NumSamples = samples;
 204                      rb->NumStorageSamples = storage_samples;
 205                      goto found;
 206                   }
 207                }
 208             }
 209             found:;
 210          }
 211       } else {
 212          for (unsigned samples = start; samples <= ctx->Const.MaxSamples;
 213               samples++) {
 214             format = st_choose_renderbuffer_format(st, internalFormat,
 215                                                    samples, samples);
 216
 217             if (format != PIPE_FORMAT_NONE) {
 218                rb->NumSamples = samples;
 219                rb->NumStorageSamples = samples;
 220                break;
 221             }
 222          }
 223       }
 224    } else {
 225       format = st_choose_renderbuffer_format(st, internalFormat, 0, 0);
 226    }
 227
 228    /* Not setting gl_renderbuffer::Format here will cause
 229     * FRAMEBUFFER_UNSUPPORTED and ValidateFramebuffer will not be called.
 230     */
 231    if (format == PIPE_FORMAT_NONE) {
 232       return GL_TRUE;
 233    }
 234
 235    strb->Base.Format = st_pipe_format_to_mesa_format(format);
 236
 237    if (width == 0 || height == 0) {
 238       /* if size is zero, nothing to allocate */
 239       return GL_TRUE;
 240    }
 241
 242    /* Setup new texture template.
 243     */
 244    memset(&templ, 0, sizeof(templ));
 245    templ.target = st->internal_target;
 246    templ.format = format;
 247    templ.width0 = width;
 248    templ.height0 = height;
 249    templ.depth0 = 1;
 250    templ.array_size = 1;
 251    templ.nr_samples = rb->NumSamples;
 252    templ.nr_storage_samples = rb->NumStorageSamples;
 253
 254    if (util_format_is_depth_or_stencil(format)) {
 255       templ.bind = PIPE_BIND_DEPTH_STENCIL;
 256    }
 257    else if (strb->Base.Name != 0) {
 258       /* this is a user-created renderbuffer */
 259       templ.bind = PIPE_BIND_RENDER_TARGET;
 260    }
 261    else {
 262       /* this is a window-system buffer */
 263       templ.bind = (PIPE_BIND_DISPLAY_TARGET |
 264                     PIPE_BIND_RENDER_TARGET);
 265    }
 266
 267    strb->texture = screen->resource_create(screen, &templ);
 268
 269    if (!strb->texture)
 270       return FALSE;
 271
 272    st_update_renderbuffer_surface(st, strb);
 273    return strb->surface != NULL;
 274 }
 275
 276
 277 /**
 278  * gl_renderbuffer::Delete()
 279  */
 280 static void
 281 st_renderbuffer_delete(struct gl_context *ctx, struct gl_renderbuffer *rb)
 282 {
 283    struct st_renderbuffer *strb = st_renderbuffer(rb);
 284    if (ctx) {
 285       struct st_context *st = st_context(ctx);
 286       pipe_surface_release(st->pipe, &strb->surface_srgb);
 287       pipe_surface_release(st->pipe, &strb->surface_linear);
 288       strb->surface = NULL;
 289    }
 290    pipe_resource_reference(&strb->texture, NULL);
 291    free(strb->data);
 292    _mesa_delete_renderbuffer(ctx, rb);
 293 }
 294
 295
 296 /**
 297  * Called via ctx->Driver.NewRenderbuffer()
 298  */
 299 static struct gl_renderbuffer *
 300 st_new_renderbuffer(struct gl_context *ctx, GLuint name)
 301 {
 302    struct st_renderbuffer *strb = ST_CALLOC_STRUCT(st_renderbuffer);
 303    if (strb) {
 304       assert(name != 0);
 305       _mesa_init_renderbuffer(&strb->Base, name);
 306       strb->Base.Delete = st_renderbuffer_delete;
 307       strb->Base.AllocStorage = st_renderbuffer_alloc_storage;
 308       return &strb->Base;
 309    }
 310    return NULL;
 311 }
 312
 313
 314 /**
 315  * Allocate a renderbuffer for an on-screen window (not a user-created
 316  * renderbuffer).  The window system code determines the format.
 317  */
 318 struct gl_renderbuffer *
 319 st_new_renderbuffer_fb(enum pipe_format format, unsigned samples, boolean sw)
 320 {
 321    struct st_renderbuffer *strb;
 322
 323    strb = ST_CALLOC_STRUCT(st_renderbuffer);
 324    if (!strb) {
 325       _mesa_error(NULL, GL_OUT_OF_MEMORY, "creating renderbuffer");
 326       return NULL;
 327    }
 328
 329    _mesa_init_renderbuffer(&strb->Base, 0);
 330    strb->Base.ClassID = 0x4242; /* just a unique value */
 331    strb->Base.NumSamples = samples;
 332    strb->Base.NumStorageSamples = samples;
 333    strb->Base.Format = st_pipe_format_to_mesa_format(format);
 334    strb->Base._BaseFormat = _mesa_get_format_base_format(strb->Base.Format);
 335    strb->software = sw;
 336
 337    switch (format) {
 338    case PIPE_FORMAT_B10G10R10A2_UNORM:
 339    case PIPE_FORMAT_R10G10B10A2_UNORM:
 340       strb->Base.InternalFormat = GL_RGB10_A2;
 341       break;
 342    case PIPE_FORMAT_R10G10B10X2_UNORM:
 343    case PIPE_FORMAT_B10G10R10X2_UNORM:
 344       strb->Base.InternalFormat = GL_RGB10;
 345       break;
 346    case PIPE_FORMAT_R8G8B8A8_UNORM:
 347    case PIPE_FORMAT_B8G8R8A8_UNORM:
 348    case PIPE_FORMAT_A8R8G8B8_UNORM:
 349       strb->Base.InternalFormat = GL_RGBA8;
 350       break;
 351    case PIPE_FORMAT_R8G8B8X8_UNORM:
 352    case PIPE_FORMAT_B8G8R8X8_UNORM:
 353    case PIPE_FORMAT_X8R8G8B8_UNORM:
 354       strb->Base.InternalFormat = GL_RGB8;
 355       break;
 356    case PIPE_FORMAT_R8G8B8A8_SRGB:
 357    case PIPE_FORMAT_B8G8R8A8_SRGB:
 358    case PIPE_FORMAT_A8R8G8B8_SRGB:
 359       strb->Base.InternalFormat = GL_SRGB8_ALPHA8;
 360       break;
 361    case PIPE_FORMAT_R8G8B8X8_SRGB:
 362    case PIPE_FORMAT_B8G8R8X8_SRGB:
 363    case PIPE_FORMAT_X8R8G8B8_SRGB:
 364       strb->Base.InternalFormat = GL_SRGB8;
 365       break;
 366    case PIPE_FORMAT_B5G5R5A1_UNORM:
 367       strb->Base.InternalFormat = GL_RGB5_A1;
 368       break;
 369    case PIPE_FORMAT_B4G4R4A4_UNORM:
 370       strb->Base.InternalFormat = GL_RGBA4;
 371       break;
 372    case PIPE_FORMAT_B5G6R5_UNORM:
 373       strb->Base.InternalFormat = GL_RGB565;
 374       break;
 375    case PIPE_FORMAT_Z16_UNORM:
 376       strb->Base.InternalFormat = GL_DEPTH_COMPONENT16;
 377       break;
 378    case PIPE_FORMAT_Z32_UNORM:
 379       strb->Base.InternalFormat = GL_DEPTH_COMPONENT32;
 380       break;
 381    case PIPE_FORMAT_Z24_UNORM_S8_UINT:
 382    case PIPE_FORMAT_S8_UINT_Z24_UNORM:
 383       strb->Base.InternalFormat = GL_DEPTH24_STENCIL8_EXT;
 384       break;
 385    case PIPE_FORMAT_Z24X8_UNORM:
 386    case PIPE_FORMAT_X8Z24_UNORM:
 387       strb->Base.InternalFormat = GL_DEPTH_COMPONENT24;
 388       break;
 389    case PIPE_FORMAT_S8_UINT:
 390       strb->Base.InternalFormat = GL_STENCIL_INDEX8_EXT;
 391       break;
 392    case PIPE_FORMAT_R16G16B16A16_SNORM:
 393       /* accum buffer */
 394       strb->Base.InternalFormat = GL_RGBA16_SNORM;
 395       break;
 396    case PIPE_FORMAT_R16G16B16A16_UNORM:
 397       strb->Base.InternalFormat = GL_RGBA16;
 398       break;
 399    case PIPE_FORMAT_R8_UNORM:
 400       strb->Base.InternalFormat = GL_R8;
 401       break;
 402    case PIPE_FORMAT_R8G8_UNORM:
 403       strb->Base.InternalFormat = GL_RG8;
 404       break;
 405    case PIPE_FORMAT_R16_UNORM:
 406       strb->Base.InternalFormat = GL_R16;
 407       break;
 408    case PIPE_FORMAT_R16G16_UNORM:
 409       strb->Base.InternalFormat = GL_RG16;
 410       break;
 411    case PIPE_FORMAT_R32G32B32A32_FLOAT:
 412       strb->Base.InternalFormat = GL_RGBA32F;
 413       break;
 414    case PIPE_FORMAT_R16G16B16A16_FLOAT:
 415       strb->Base.InternalFormat = GL_RGBA16F;
 416       break;
 417    default:
 418       _mesa_problem(NULL,
 419                     "Unexpected format %s in st_new_renderbuffer_fb",
 420                     util_format_name(format));
 421       free(strb);
 422       return NULL;
 423    }
 424
 425    /* st-specific methods */
 426    strb->Base.Delete = st_renderbuffer_delete;
 427    strb->Base.AllocStorage = st_renderbuffer_alloc_storage;
 428
 429    /* surface is allocated in st_renderbuffer_alloc_storage() */
 430    strb->surface = NULL;
 431
 432    return &strb->Base;
 433 }
 434
 435
 436 /**
 437  * Create or update the pipe_surface of a FBO renderbuffer.
 438  * This is usually called after st_finalize_texture.
 439  */
 440 void
 441 st_update_renderbuffer_surface(struct st_context *st,
 442                                struct st_renderbuffer *strb)
 443 {
 444    struct pipe_context *pipe = st->pipe;
 445    struct pipe_resource *resource = strb->texture;
 446    const struct st_texture_object *stTexObj = NULL;
 447    unsigned rtt_width = strb->Base.Width;
 448    unsigned rtt_height = strb->Base.Height;
 449    unsigned rtt_depth = strb->Base.Depth;
 450
 451    /*
 452     * For winsys fbo, it is possible that the renderbuffer is sRGB-capable but
 453     * the format of strb->texture is linear (because we have no control over
 454     * the format).  Check strb->Base.Format instead of strb->texture->format
 455     * to determine if the rb is sRGB-capable.
 456     */
 457    boolean enable_srgb = st->ctx->Color.sRGBEnabled &&
 458       _mesa_get_format_color_encoding(strb->Base.Format) == GL_SRGB;
 459    enum pipe_format format = resource->format;
 460
 461    if (strb->is_rtt) {
 462       stTexObj = st_texture_object(strb->Base.TexImage->TexObject);
 463       if (stTexObj->surface_based)
 464          format = stTexObj->surface_format;
 465    }
 466
 467    format = enable_srgb ? util_format_srgb(format) : util_format_linear(format);
 468
 469    if (resource->target == PIPE_TEXTURE_1D_ARRAY) {
 470       rtt_depth = rtt_height;
 471       rtt_height = 1;
 472    }
 473
 474    /* find matching mipmap level size */
 475    unsigned level;
 476    for (level = 0; level <= resource->last_level; level++) {
 477       if (u_minify(resource->width0, level) == rtt_width &&
 478           u_minify(resource->height0, level) == rtt_height &&
 479           (resource->target != PIPE_TEXTURE_3D ||
 480            u_minify(resource->depth0, level) == rtt_depth)) {
 481          break;
 482       }
 483    }
 484    assert(level <= resource->last_level);
 485
 486    /* determine the layer bounds */
 487    unsigned first_layer, last_layer;
 488    if (strb->rtt_layered) {
 489       first_layer = 0;
 490       last_layer = util_max_layer(strb->texture, level);
 491    }
 492    else {
 493       first_layer =
 494       last_layer = strb->rtt_face + strb->rtt_slice;
 495    }
 496
 497    /* Adjust for texture views */
 498    if (strb->is_rtt && resource->array_size > 1 &&
 499        stTexObj->base.Immutable) {
 500       const struct gl_texture_object *tex = &stTexObj->base;
 501       first_layer += tex->MinLayer;
 502       if (!strb->rtt_layered)
 503          last_layer += tex->MinLayer;
 504       else
 505          last_layer = MIN2(first_layer + tex->NumLayers - 1, last_layer);
 506    }
 507
 508    struct pipe_surface **psurf =
 509       enable_srgb ? &strb->surface_srgb : &strb->surface_linear;
 510    struct pipe_surface *surf = *psurf;
 511
 512    if (!surf ||
 513        surf->texture->nr_samples != strb->Base.NumSamples ||
 514        surf->texture->nr_storage_samples != strb->Base.NumStorageSamples ||
 515        surf->format != format ||
 516        surf->texture != resource ||
 517        surf->width != rtt_width ||
 518        surf->height != rtt_height ||
 519        surf->nr_samples != strb->rtt_nr_samples ||
 520        surf->u.tex.level != level ||
 521        surf->u.tex.first_layer != first_layer ||
 522        surf->u.tex.last_layer != last_layer) {
 523       /* create a new pipe_surface */
 524       struct pipe_surface surf_tmpl;
 525       memset(&surf_tmpl, 0, sizeof(surf_tmpl));
 526       surf_tmpl.format = format;
 527       surf_tmpl.nr_samples = strb->rtt_nr_samples;
 528       surf_tmpl.u.tex.level = level;
 529       surf_tmpl.u.tex.first_layer = first_layer;
 530       surf_tmpl.u.tex.last_layer = last_layer;
 531
 532       pipe_surface_release(pipe, psurf);
 533
 534       *psurf = pipe->create_surface(pipe, resource, &surf_tmpl);
 535    }
 536    strb->surface = *psurf;
 537 }
 538
 539
 540 /**
 541  * Return the pipe_resource which stores a particular texture image.
 542  */
 543 static struct pipe_resource *
 544 get_teximage_resource(struct gl_texture_object *texObj,
 545                       unsigned face, unsigned level)
 546 {
 547    struct st_texture_image *stImg =
 548       st_texture_image(texObj->Image[face][level]);
 549
 550    return stImg->pt;
 551 }
 552
 553
 554 /**
 555  * Called by ctx->Driver.RenderTexture
 556  */
 557 static void
 558 st_render_texture(struct gl_context *ctx,
 559                   struct gl_framebuffer *fb,
 560                   struct gl_renderbuffer_attachment *att)
 561 {
 562    struct st_context *st = st_context(ctx);
 563    struct gl_renderbuffer *rb = att->Renderbuffer;
 564    struct st_renderbuffer *strb = st_renderbuffer(rb);
 565    struct pipe_resource *pt;
 566
 567    pt = get_teximage_resource(att->Texture,
 568                               att->CubeMapFace,
 569                               att->TextureLevel);
 570    assert(pt);
 571
 572    /* point renderbuffer at texobject */
 573    strb->is_rtt = TRUE;
 574    strb->rtt_face = att->CubeMapFace;
 575    strb->rtt_slice = att->Zoffset;
 576    strb->rtt_layered = att->Layered;
 577    strb->rtt_nr_samples = att->NumSamples;
 578    pipe_resource_reference(&strb->texture, pt);
 579
 580    st_update_renderbuffer_surface(st, strb);
 581
 582    /* Invalidate buffer state so that the pipe's framebuffer state
 583     * gets updated.
 584     * That's where the new renderbuffer (which we just created) gets
 585     * passed to the pipe as a (color/depth) render target.
 586     */
 587    st_invalidate_buffers(st);
 588
 589
 590    /* Need to trigger a call to update_framebuffer() since we just
 591     * attached a new renderbuffer.
 592     */
 593    ctx->NewState |= _NEW_BUFFERS;
 594 }
 595
 596
 597 /**
 598  * Called via ctx->Driver.FinishRenderTexture.
 599  */
 600 static void
 601 st_finish_render_texture(struct gl_context *ctx, struct gl_renderbuffer *rb)
 602 {
 603    struct st_context *st = st_context(ctx);
 604    struct st_renderbuffer *strb = st_renderbuffer(rb);
 605
 606    if (!strb)
 607       return;
 608
 609    strb->is_rtt = FALSE;
 610
 611    /* restore previous framebuffer state */
 612    st_invalidate_buffers(st);
 613 }
 614
 615
 616 /** Debug helper */
 617 static void
 618 st_fbo_invalid(const char *reason)
 619 {
 620    if (MESA_DEBUG_FLAGS & DEBUG_INCOMPLETE_FBO) {
 621       _mesa_debug(NULL, "Invalid FBO: %s\n", reason);
 622    }
 623 }
 624
 625
 626 /**
 627  * Validate a renderbuffer attachment for a particular set of bindings.
 628  */
 629 static GLboolean
 630 st_validate_attachment(struct gl_context *ctx,
 631                        struct pipe_screen *screen,
 632                        const struct gl_renderbuffer_attachment *att,
 633                        unsigned bindings)
 634 {
 635    const struct st_texture_object *stObj = st_texture_object(att->Texture);
 636    enum pipe_format format;
 637    mesa_format texFormat;
 638    GLboolean valid;
 639
 640    /* Sanity check: we must be binding the surface as a (color) render target
 641     * or depth/stencil target.
 642     */
 643    assert(bindings == PIPE_BIND_RENDER_TARGET ||
 644           bindings == PIPE_BIND_DEPTH_STENCIL);
 645
 646    /* Only validate texture attachments for now, since
 647     * st_renderbuffer_alloc_storage makes sure that
 648     * the format is supported.
 649     */
 650    if (att->Type != GL_TEXTURE)
 651       return GL_TRUE;
 652
 653    if (!stObj || !stObj->pt)
 654       return GL_FALSE;
 655
 656    format = stObj->pt->format;
 657    texFormat = att->Renderbuffer->TexImage->TexFormat;
 658
 659    /* If the encoding is sRGB and sRGB rendering cannot be enabled,
 660     * check for linear format support instead.
 661     * Later when we create a surface, we change the format to a linear one. */
 662    if (!ctx->Extensions.EXT_framebuffer_sRGB &&
 663        _mesa_get_format_color_encoding(texFormat) == GL_SRGB) {
 664       const mesa_format linearFormat = _mesa_get_srgb_format_linear(texFormat);
 665       format = st_mesa_format_to_pipe_format(st_context(ctx), linearFormat);
 666    }
 667
 668    valid = screen->is_format_supported(screen, format,
 669                                        PIPE_TEXTURE_2D,
 670                                        stObj->pt->nr_samples,
 671                                        stObj->pt->nr_storage_samples,
 672                                        bindings);
 673    if (!valid) {
 674       st_fbo_invalid("Invalid format");
 675    }
 676
 677    return valid;
 678 }
 679
 680
 681 /**
 682  * Check that the framebuffer configuration is valid in terms of what
 683  * the driver can support.
 684  *
 685  * For Gallium we only supports combined Z+stencil, not separate buffers.
 686  */
 687 static void
 688 st_validate_framebuffer(struct gl_context *ctx, struct gl_framebuffer *fb)
 689 {
 690    struct st_context *st = st_context(ctx);
 691    struct pipe_screen *screen = st->pipe->screen;
 692    const struct gl_renderbuffer_attachment *depth =
 693          &fb->Attachment[BUFFER_DEPTH];
 694    const struct gl_renderbuffer_attachment *stencil =
 695          &fb->Attachment[BUFFER_STENCIL];
 696    GLuint i;
 697    enum pipe_format first_format = PIPE_FORMAT_NONE;
 698    boolean mixed_formats =
 699          screen->get_param(screen, PIPE_CAP_MIXED_COLORBUFFER_FORMATS) != 0;
 700
 701    if (depth->Type && stencil->Type && depth->Type != stencil->Type) {
 702       st_fbo_invalid("Different Depth/Stencil buffer formats");
 703       fb->_Status = GL_FRAMEBUFFER_UNSUPPORTED_EXT;
 704       return;
 705    }
 706    if (depth->Type == GL_RENDERBUFFER_EXT &&
 707        stencil->Type == GL_RENDERBUFFER_EXT &&
 708        depth->Renderbuffer != stencil->Renderbuffer) {
 709       st_fbo_invalid("Separate Depth/Stencil buffers");
 710       fb->_Status = GL_FRAMEBUFFER_UNSUPPORTED_EXT;
 711       return;
 712    }
 713    if (depth->Type == GL_TEXTURE &&
 714        stencil->Type == GL_TEXTURE &&
 715        depth->Texture != stencil->Texture) {
 716       fb->_Status = GL_FRAMEBUFFER_UNSUPPORTED_EXT;
 717       st_fbo_invalid("Different Depth/Stencil textures");
 718       return;
 719    }
 720
 721    if (!st_validate_attachment(ctx, screen, depth, PIPE_BIND_DEPTH_STENCIL)) {
 722       fb->_Status = GL_FRAMEBUFFER_UNSUPPORTED_EXT;
 723       st_fbo_invalid("Invalid depth attachment");
 724       return;
 725    }
 726    if (!st_validate_attachment(ctx, screen, stencil, PIPE_BIND_DEPTH_STENCIL)) {
 727       fb->_Status = GL_FRAMEBUFFER_UNSUPPORTED_EXT;
 728       st_fbo_invalid("Invalid stencil attachment");
 729       return;
 730    }
 731    for (i = 0; i < ctx->Const.MaxColorAttachments; i++) {
 732       struct gl_renderbuffer_attachment *att =
 733             &fb->Attachment[BUFFER_COLOR0 + i];
 734       enum pipe_format format;
 735
 736       if (!st_validate_attachment(ctx, screen, att, PIPE_BIND_RENDER_TARGET)) {
 737          fb->_Status = GL_FRAMEBUFFER_UNSUPPORTED_EXT;
 738          st_fbo_invalid("Invalid color attachment");
 739          return;
 740       }
 741
 742       if (!mixed_formats) {
 743          /* Disallow mixed formats. */
 744          if (att->Type != GL_NONE) {
 745             format = st_renderbuffer(att->Renderbuffer)->surface->format;
 746          } else {
 747             continue;
 748          }
 749
 750          if (first_format == PIPE_FORMAT_NONE) {
 751             first_format = format;
 752          } else if (format != first_format) {
 753             fb->_Status = GL_FRAMEBUFFER_UNSUPPORTED_EXT;
 754             st_fbo_invalid("Mixed color formats");
 755             return;
 756          }
 757       }
 758    }
 759 }
 760
 761
 762 /**
 763  * Called via glDrawBuffer.  We only provide this driver function so that we
 764  * can check if we need to allocate a new renderbuffer.  Specifically, we
 765  * don't usually allocate a front color buffer when using a double-buffered
 766  * visual.  But if the app calls glDrawBuffer(GL_FRONT) we need to allocate
 767  * that buffer.  Note, this is only for window system buffers, not user-
 768  * created FBOs.
 769  */
 770 static void
 771 st_DrawBufferAllocate(struct gl_context *ctx)
 772 {
 773    struct st_context *st = st_context(ctx);
 774    struct gl_framebuffer *fb = ctx->DrawBuffer;
 775
 776    if (_mesa_is_winsys_fbo(fb)) {
 777       GLuint i;
 778       /* add the renderbuffers on demand */
 779       for (i = 0; i < fb->_NumColorDrawBuffers; i++) {
 780          gl_buffer_index idx = fb->_ColorDrawBufferIndexes[i];
 781
 782          if (idx != BUFFER_NONE) {
 783             st_manager_add_color_renderbuffer(st, fb, idx);
 784          }
 785       }
 786    }
 787 }
 788
 789
 790 /**
 791  * Called via glReadBuffer.  As with st_DrawBufferAllocate, we use this
 792  * function to check if we need to allocate a renderbuffer on demand.
 793  */
 794 static void
 795 st_ReadBuffer(struct gl_context *ctx, GLenum buffer)
 796 {
 797    struct st_context *st = st_context(ctx);
 798    struct gl_framebuffer *fb = ctx->ReadBuffer;
 799
 800    (void) buffer;
 801
 802    /* Check if we need to allocate a front color buffer.
 803     * Front buffers are often allocated on demand (other color buffers are
 804     * always allocated in advance).
 805     */
 806    if ((fb->_ColorReadBufferIndex == BUFFER_FRONT_LEFT ||
 807         fb->_ColorReadBufferIndex == BUFFER_FRONT_RIGHT) &&
 808        fb->Attachment[fb->_ColorReadBufferIndex].Type == GL_NONE) {
 809       assert(_mesa_is_winsys_fbo(fb));
 810       /* add the buffer */
 811       st_manager_add_color_renderbuffer(st, fb, fb->_ColorReadBufferIndex);
 812       _mesa_update_state(ctx);
 813       st_validate_state(st, ST_PIPELINE_UPDATE_FRAMEBUFFER);
 814    }
 815 }
 816
 817
 818
 819 /**
 820  * Called via ctx->Driver.MapRenderbuffer.
 821  */
 822 static void
 823 st_MapRenderbuffer(struct gl_context *ctx,
 824                    struct gl_renderbuffer *rb,
 825                    GLuint x, GLuint y, GLuint w, GLuint h,
 826                    GLbitfield mode,
 827                    GLubyte **mapOut, GLint *rowStrideOut,
 828                    bool flip_y)
 829 {
 830    struct st_context *st = st_context(ctx);
 831    struct st_renderbuffer *strb = st_renderbuffer(rb);
 832    struct pipe_context *pipe = st->pipe;
 833    const GLboolean invert = rb->Name == 0;
 834    GLuint y2;
 835    GLubyte *map;
 836
 837    /* driver does not support GL_FRAMEBUFFER_FLIP_Y_MESA */
 838    assert((rb->Name == 0) == flip_y);
 839
 840    if (strb->software) {
 841       /* software-allocated renderbuffer (probably an accum buffer) */
 842       if (strb->data) {
 843          GLint bpp = _mesa_get_format_bytes(strb->Base.Format);
 844          GLint stride = _mesa_format_row_stride(strb->Base.Format,
 845                                                 strb->Base.Width);
 846          *mapOut = (GLubyte *) strb->data + y * stride + x * bpp;
 847          *rowStrideOut = stride;
 848       }
 849       else {
 850          *mapOut = NULL;
 851          *rowStrideOut = 0;
 852       }
 853       return;
 854    }
 855
 856    /* Check for unexpected flags */
 857    assert((mode & ~(GL_MAP_READ_BIT |
 858                     GL_MAP_WRITE_BIT |
 859                     GL_MAP_INVALIDATE_RANGE_BIT)) == 0);
 860
 861    const enum pipe_transfer_usage transfer_flags =
 862       st_access_flags_to_transfer_flags(mode, false);
 863
 864    /* Note: y=0=bottom of buffer while y2=0=top of buffer.
 865     * 'invert' will be true for window-system buffers and false for
 866     * user-allocated renderbuffers and textures.
 867     */
 868    if (invert)
 869       y2 = strb->Base.Height - y - h;
 870    else
 871       y2 = y;
 872
 873     map = pipe_transfer_map(pipe,
 874                             strb->texture,
 875                             strb->surface->u.tex.level,
 876                             strb->surface->u.tex.first_layer,
 877                             transfer_flags, x, y2, w, h, &strb->transfer);
 878    if (map) {
 879       if (invert) {
 880          *rowStrideOut = -(int) strb->transfer->stride;
 881          map += (h - 1) * strb->transfer->stride;
 882       }
 883       else {
 884          *rowStrideOut = strb->transfer->stride;
 885       }
 886       *mapOut = map;
 887    }
 888    else {
 889       *mapOut = NULL;
 890       *rowStrideOut = 0;
 891    }
 892 }
 893
 894
 895 /**
 896  * Called via ctx->Driver.UnmapRenderbuffer.
 897  */
 898 static void
 899 st_UnmapRenderbuffer(struct gl_context *ctx,
 900                      struct gl_renderbuffer *rb)
 901 {
 902    struct st_context *st = st_context(ctx);
 903    struct st_renderbuffer *strb = st_renderbuffer(rb);
 904    struct pipe_context *pipe = st->pipe;
 905
 906    if (strb->software) {
 907       /* software-allocated renderbuffer (probably an accum buffer) */
 908       return;
 909    }
 910
 911    pipe_transfer_unmap(pipe, strb->transfer);
 912    strb->transfer = NULL;
 913 }
 914
 915
 916 /**
 917  * Called via ctx->Driver.EvaluateDepthValues.
 918  */
 919 static void
 920 st_EvaluateDepthValues(struct gl_context *ctx)
 921 {
 922    struct st_context *st = st_context(ctx);
 923
 924    st_validate_state(st, ST_PIPELINE_UPDATE_FRAMEBUFFER);
 925
 926    st->pipe->evaluate_depth_buffer(st->pipe);
 927 }
 928
 929
 930 void
 931 st_init_fbo_functions(struct dd_function_table *functions)
 932 {
 933    functions->NewFramebuffer = _mesa_new_framebuffer;
 934    functions->NewRenderbuffer = st_new_renderbuffer;
 935    functions->FramebufferRenderbuffer = _mesa_FramebufferRenderbuffer_sw;
 936    functions->RenderTexture = st_render_texture;
 937    functions->FinishRenderTexture = st_finish_render_texture;
 938    functions->ValidateFramebuffer = st_validate_framebuffer;
 939
 940    functions->DrawBufferAllocate = st_DrawBufferAllocate;
 941    functions->ReadBuffer = st_ReadBuffer;
 942
 943    functions->MapRenderbuffer = st_MapRenderbuffer;
 944    functions->UnmapRenderbuffer = st_UnmapRenderbuffer;
 945    functions->EvaluateDepthValues = st_EvaluateDepthValues;
 946 }