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    } else {
 289       pipe_surface_release_no_context(&strb->surface_srgb);
 290       pipe_surface_release_no_context(&strb->surface_linear);
 291    }
 292    strb->surface = NULL;
 293    pipe_resource_reference(&strb->texture, NULL);
 294    free(strb->data);
 295    _mesa_delete_renderbuffer(ctx, rb);
 296 }
 297
 298
 299 /**
 300  * Called via ctx->Driver.NewRenderbuffer()
 301  */
 302 static struct gl_renderbuffer *
 303 st_new_renderbuffer(struct gl_context *ctx, GLuint name)
 304 {
 305    struct st_renderbuffer *strb = ST_CALLOC_STRUCT(st_renderbuffer);
 306    if (strb) {
 307       assert(name != 0);
 308       _mesa_init_renderbuffer(&strb->Base, name);
 309       strb->Base.Delete = st_renderbuffer_delete;
 310       strb->Base.AllocStorage = st_renderbuffer_alloc_storage;
 311       return &strb->Base;
 312    }
 313    return NULL;
 314 }
 315
 316
 317 /**
 318  * Allocate a renderbuffer for an on-screen window (not a user-created
 319  * renderbuffer).  The window system code determines the format.
 320  */
 321 struct gl_renderbuffer *
 322 st_new_renderbuffer_fb(enum pipe_format format, unsigned samples, boolean sw)
 323 {
 324    struct st_renderbuffer *strb;
 325
 326    strb = ST_CALLOC_STRUCT(st_renderbuffer);
 327    if (!strb) {
 328       _mesa_error(NULL, GL_OUT_OF_MEMORY, "creating renderbuffer");
 329       return NULL;
 330    }
 331
 332    _mesa_init_renderbuffer(&strb->Base, 0);
 333    strb->Base.ClassID = 0x4242; /* just a unique value */
 334    strb->Base.NumSamples = samples;
 335    strb->Base.NumStorageSamples = samples;
 336    strb->Base.Format = st_pipe_format_to_mesa_format(format);
 337    strb->Base._BaseFormat = _mesa_get_format_base_format(strb->Base.Format);
 338    strb->software = sw;
 339
 340    switch (format) {
 341    case PIPE_FORMAT_B10G10R10A2_UNORM:
 342    case PIPE_FORMAT_R10G10B10A2_UNORM:
 343       strb->Base.InternalFormat = GL_RGB10_A2;
 344       break;
 345    case PIPE_FORMAT_R10G10B10X2_UNORM:
 346    case PIPE_FORMAT_B10G10R10X2_UNORM:
 347       strb->Base.InternalFormat = GL_RGB10;
 348       break;
 349    case PIPE_FORMAT_R8G8B8A8_UNORM:
 350    case PIPE_FORMAT_B8G8R8A8_UNORM:
 351    case PIPE_FORMAT_A8R8G8B8_UNORM:
 352       strb->Base.InternalFormat = GL_RGBA8;
 353       break;
 354    case PIPE_FORMAT_R8G8B8X8_UNORM:
 355    case PIPE_FORMAT_B8G8R8X8_UNORM:
 356    case PIPE_FORMAT_X8R8G8B8_UNORM:
 357       strb->Base.InternalFormat = GL_RGB8;
 358       break;
 359    case PIPE_FORMAT_R8G8B8A8_SRGB:
 360    case PIPE_FORMAT_B8G8R8A8_SRGB:
 361    case PIPE_FORMAT_A8R8G8B8_SRGB:
 362       strb->Base.InternalFormat = GL_SRGB8_ALPHA8;
 363       break;
 364    case PIPE_FORMAT_R8G8B8X8_SRGB:
 365    case PIPE_FORMAT_B8G8R8X8_SRGB:
 366    case PIPE_FORMAT_X8R8G8B8_SRGB:
 367       strb->Base.InternalFormat = GL_SRGB8;
 368       break;
 369    case PIPE_FORMAT_B5G5R5A1_UNORM:
 370       strb->Base.InternalFormat = GL_RGB5_A1;
 371       break;
 372    case PIPE_FORMAT_B4G4R4A4_UNORM:
 373       strb->Base.InternalFormat = GL_RGBA4;
 374       break;
 375    case PIPE_FORMAT_B5G6R5_UNORM:
 376       strb->Base.InternalFormat = GL_RGB565;
 377       break;
 378    case PIPE_FORMAT_Z16_UNORM:
 379       strb->Base.InternalFormat = GL_DEPTH_COMPONENT16;
 380       break;
 381    case PIPE_FORMAT_Z32_UNORM:
 382       strb->Base.InternalFormat = GL_DEPTH_COMPONENT32;
 383       break;
 384    case PIPE_FORMAT_Z24_UNORM_S8_UINT:
 385    case PIPE_FORMAT_S8_UINT_Z24_UNORM:
 386       strb->Base.InternalFormat = GL_DEPTH24_STENCIL8_EXT;
 387       break;
 388    case PIPE_FORMAT_Z24X8_UNORM:
 389    case PIPE_FORMAT_X8Z24_UNORM:
 390       strb->Base.InternalFormat = GL_DEPTH_COMPONENT24;
 391       break;
 392    case PIPE_FORMAT_S8_UINT:
 393       strb->Base.InternalFormat = GL_STENCIL_INDEX8_EXT;
 394       break;
 395    case PIPE_FORMAT_R16G16B16A16_SNORM:
 396       /* accum buffer */
 397       strb->Base.InternalFormat = GL_RGBA16_SNORM;
 398       break;
 399    case PIPE_FORMAT_R16G16B16A16_UNORM:
 400       strb->Base.InternalFormat = GL_RGBA16;
 401       break;
 402    case PIPE_FORMAT_R8_UNORM:
 403       strb->Base.InternalFormat = GL_R8;
 404       break;
 405    case PIPE_FORMAT_R8G8_UNORM:
 406       strb->Base.InternalFormat = GL_RG8;
 407       break;
 408    case PIPE_FORMAT_R16_UNORM:
 409       strb->Base.InternalFormat = GL_R16;
 410       break;
 411    case PIPE_FORMAT_R16G16_UNORM:
 412       strb->Base.InternalFormat = GL_RG16;
 413       break;
 414    case PIPE_FORMAT_R32G32B32A32_FLOAT:
 415       strb->Base.InternalFormat = GL_RGBA32F;
 416       break;
 417    case PIPE_FORMAT_R16G16B16A16_FLOAT:
 418       strb->Base.InternalFormat = GL_RGBA16F;
 419       break;
 420    default:
 421       _mesa_problem(NULL,
 422                     "Unexpected format %s in st_new_renderbuffer_fb",
 423                     util_format_name(format));
 424       free(strb);
 425       return NULL;
 426    }
 427
 428    /* st-specific methods */
 429    strb->Base.Delete = st_renderbuffer_delete;
 430    strb->Base.AllocStorage = st_renderbuffer_alloc_storage;
 431
 432    /* surface is allocated in st_renderbuffer_alloc_storage() */
 433    strb->surface = NULL;
 434
 435    return &strb->Base;
 436 }
 437
 438
 439 /**
 440  * Create or update the pipe_surface of a FBO renderbuffer.
 441  * This is usually called after st_finalize_texture.
 442  */
 443 void
 444 st_update_renderbuffer_surface(struct st_context *st,
 445                                struct st_renderbuffer *strb)
 446 {
 447    struct pipe_context *pipe = st->pipe;
 448    struct pipe_resource *resource = strb->texture;
 449    const struct st_texture_object *stTexObj = NULL;
 450    unsigned rtt_width = strb->Base.Width;
 451    unsigned rtt_height = strb->Base.Height;
 452    unsigned rtt_depth = strb->Base.Depth;
 453
 454    /*
 455     * For winsys fbo, it is possible that the renderbuffer is sRGB-capable but
 456     * the format of strb->texture is linear (because we have no control over
 457     * the format).  Check strb->Base.Format instead of strb->texture->format
 458     * to determine if the rb is sRGB-capable.
 459     */
 460    boolean enable_srgb = st->ctx->Color.sRGBEnabled &&
 461       _mesa_get_format_color_encoding(strb->Base.Format) == GL_SRGB;
 462    enum pipe_format format = resource->format;
 463
 464    if (strb->is_rtt) {
 465       stTexObj = st_texture_object(strb->Base.TexImage->TexObject);
 466       if (stTexObj->surface_based)
 467          format = stTexObj->surface_format;
 468    }
 469
 470    format = enable_srgb ? util_format_srgb(format) : util_format_linear(format);
 471
 472    if (resource->target == PIPE_TEXTURE_1D_ARRAY) {
 473       rtt_depth = rtt_height;
 474       rtt_height = 1;
 475    }
 476
 477    /* find matching mipmap level size */
 478    unsigned level;
 479    for (level = 0; level <= resource->last_level; level++) {
 480       if (u_minify(resource->width0, level) == rtt_width &&
 481           u_minify(resource->height0, level) == rtt_height &&
 482           (resource->target != PIPE_TEXTURE_3D ||
 483            u_minify(resource->depth0, level) == rtt_depth)) {
 484          break;
 485       }
 486    }
 487    assert(level <= resource->last_level);
 488
 489    /* determine the layer bounds */
 490    unsigned first_layer, last_layer;
 491    if (strb->rtt_layered) {
 492       first_layer = 0;
 493       last_layer = util_max_layer(strb->texture, level);
 494    }
 495    else {
 496       first_layer =
 497       last_layer = strb->rtt_face + strb->rtt_slice;
 498    }
 499
 500    /* Adjust for texture views */
 501    if (strb->is_rtt && resource->array_size > 1 &&
 502        stTexObj->base.Immutable) {
 503       const struct gl_texture_object *tex = &stTexObj->base;
 504       first_layer += tex->MinLayer;
 505       if (!strb->rtt_layered)
 506          last_layer += tex->MinLayer;
 507       else
 508          last_layer = MIN2(first_layer + tex->NumLayers - 1, last_layer);
 509    }
 510
 511    struct pipe_surface **psurf =
 512       enable_srgb ? &strb->surface_srgb : &strb->surface_linear;
 513    struct pipe_surface *surf = *psurf;
 514
 515    if (!surf ||
 516        surf->texture->nr_samples != strb->Base.NumSamples ||
 517        surf->texture->nr_storage_samples != strb->Base.NumStorageSamples ||
 518        surf->format != format ||
 519        surf->texture != resource ||
 520        surf->width != rtt_width ||
 521        surf->height != rtt_height ||
 522        surf->nr_samples != strb->rtt_nr_samples ||
 523        surf->u.tex.level != level ||
 524        surf->u.tex.first_layer != first_layer ||
 525        surf->u.tex.last_layer != last_layer) {
 526       /* create a new pipe_surface */
 527       struct pipe_surface surf_tmpl;
 528       memset(&surf_tmpl, 0, sizeof(surf_tmpl));
 529       surf_tmpl.format = format;
 530       surf_tmpl.nr_samples = strb->rtt_nr_samples;
 531       surf_tmpl.u.tex.level = level;
 532       surf_tmpl.u.tex.first_layer = first_layer;
 533       surf_tmpl.u.tex.last_layer = last_layer;
 534
 535       pipe_surface_release(pipe, psurf);
 536
 537       *psurf = pipe->create_surface(pipe, resource, &surf_tmpl);
 538    }
 539    strb->surface = *psurf;
 540 }
 541
 542
 543 /**
 544  * Return the pipe_resource which stores a particular texture image.
 545  */
 546 static struct pipe_resource *
 547 get_teximage_resource(struct gl_texture_object *texObj,
 548                       unsigned face, unsigned level)
 549 {
 550    struct st_texture_image *stImg =
 551       st_texture_image(texObj->Image[face][level]);
 552
 553    return stImg->pt;
 554 }
 555
 556
 557 /**
 558  * Called by ctx->Driver.RenderTexture
 559  */
 560 static void
 561 st_render_texture(struct gl_context *ctx,
 562                   struct gl_framebuffer *fb,
 563                   struct gl_renderbuffer_attachment *att)
 564 {
 565    struct st_context *st = st_context(ctx);
 566    struct gl_renderbuffer *rb = att->Renderbuffer;
 567    struct st_renderbuffer *strb = st_renderbuffer(rb);
 568    struct pipe_resource *pt;
 569
 570    pt = get_teximage_resource(att->Texture,
 571                               att->CubeMapFace,
 572                               att->TextureLevel);
 573    assert(pt);
 574
 575    /* point renderbuffer at texobject */
 576    strb->is_rtt = TRUE;
 577    strb->rtt_face = att->CubeMapFace;
 578    strb->rtt_slice = att->Zoffset;
 579    strb->rtt_layered = att->Layered;
 580    strb->rtt_nr_samples = att->NumSamples;
 581    pipe_resource_reference(&strb->texture, pt);
 582
 583    st_update_renderbuffer_surface(st, strb);
 584
 585    /* Invalidate buffer state so that the pipe's framebuffer state
 586     * gets updated.
 587     * That's where the new renderbuffer (which we just created) gets
 588     * passed to the pipe as a (color/depth) render target.
 589     */
 590    st_invalidate_buffers(st);
 591
 592
 593    /* Need to trigger a call to update_framebuffer() since we just
 594     * attached a new renderbuffer.
 595     */
 596    ctx->NewState |= _NEW_BUFFERS;
 597 }
 598
 599
 600 /**
 601  * Called via ctx->Driver.FinishRenderTexture.
 602  */
 603 static void
 604 st_finish_render_texture(struct gl_context *ctx, struct gl_renderbuffer *rb)
 605 {
 606    struct st_context *st = st_context(ctx);
 607    struct st_renderbuffer *strb = st_renderbuffer(rb);
 608
 609    if (!strb)
 610       return;
 611
 612    strb->is_rtt = FALSE;
 613
 614    /* restore previous framebuffer state */
 615    st_invalidate_buffers(st);
 616 }
 617
 618
 619 /** Debug helper */
 620 static void
 621 st_fbo_invalid(const char *reason)
 622 {
 623    if (MESA_DEBUG_FLAGS & DEBUG_INCOMPLETE_FBO) {
 624       _mesa_debug(NULL, "Invalid FBO: %s\n", reason);
 625    }
 626 }
 627
 628
 629 /**
 630  * Validate a renderbuffer attachment for a particular set of bindings.
 631  */
 632 static GLboolean
 633 st_validate_attachment(struct gl_context *ctx,
 634                        struct pipe_screen *screen,
 635                        const struct gl_renderbuffer_attachment *att,
 636                        unsigned bindings)
 637 {
 638    const struct st_texture_object *stObj = st_texture_object(att->Texture);
 639    enum pipe_format format;
 640    mesa_format texFormat;
 641    GLboolean valid;
 642
 643    /* Sanity check: we must be binding the surface as a (color) render target
 644     * or depth/stencil target.
 645     */
 646    assert(bindings == PIPE_BIND_RENDER_TARGET ||
 647           bindings == PIPE_BIND_DEPTH_STENCIL);
 648
 649    /* Only validate texture attachments for now, since
 650     * st_renderbuffer_alloc_storage makes sure that
 651     * the format is supported.
 652     */
 653    if (att->Type != GL_TEXTURE)
 654       return GL_TRUE;
 655
 656    if (!stObj || !stObj->pt)
 657       return GL_FALSE;
 658
 659    format = stObj->pt->format;
 660    texFormat = att->Renderbuffer->TexImage->TexFormat;
 661
 662    /* If the encoding is sRGB and sRGB rendering cannot be enabled,
 663     * check for linear format support instead.
 664     * Later when we create a surface, we change the format to a linear one. */
 665    if (!ctx->Extensions.EXT_framebuffer_sRGB &&
 666        _mesa_get_format_color_encoding(texFormat) == GL_SRGB) {
 667       const mesa_format linearFormat = _mesa_get_srgb_format_linear(texFormat);
 668       format = st_mesa_format_to_pipe_format(st_context(ctx), linearFormat);
 669    }
 670
 671    valid = screen->is_format_supported(screen, format,
 672                                        PIPE_TEXTURE_2D,
 673                                        stObj->pt->nr_samples,
 674                                        stObj->pt->nr_storage_samples,
 675                                        bindings);
 676    if (!valid) {
 677       st_fbo_invalid("Invalid format");
 678    }
 679
 680    return valid;
 681 }
 682
 683
 684 /**
 685  * Check that the framebuffer configuration is valid in terms of what
 686  * the driver can support.
 687  *
 688  * For Gallium we only supports combined Z+stencil, not separate buffers.
 689  */
 690 static void
 691 st_validate_framebuffer(struct gl_context *ctx, struct gl_framebuffer *fb)
 692 {
 693    struct st_context *st = st_context(ctx);
 694    struct pipe_screen *screen = st->pipe->screen;
 695    const struct gl_renderbuffer_attachment *depth =
 696          &fb->Attachment[BUFFER_DEPTH];
 697    const struct gl_renderbuffer_attachment *stencil =
 698          &fb->Attachment[BUFFER_STENCIL];
 699    GLuint i;
 700    enum pipe_format first_format = PIPE_FORMAT_NONE;
 701    boolean mixed_formats =
 702          screen->get_param(screen, PIPE_CAP_MIXED_COLORBUFFER_FORMATS) != 0;
 703
 704    if (depth->Type && stencil->Type && depth->Type != stencil->Type) {
 705       st_fbo_invalid("Different Depth/Stencil buffer formats");
 706       fb->_Status = GL_FRAMEBUFFER_UNSUPPORTED_EXT;
 707       return;
 708    }
 709    if (depth->Type == GL_RENDERBUFFER_EXT &&
 710        stencil->Type == GL_RENDERBUFFER_EXT &&
 711        depth->Renderbuffer != stencil->Renderbuffer) {
 712       st_fbo_invalid("Separate Depth/Stencil buffers");
 713       fb->_Status = GL_FRAMEBUFFER_UNSUPPORTED_EXT;
 714       return;
 715    }
 716    if (depth->Type == GL_TEXTURE &&
 717        stencil->Type == GL_TEXTURE &&
 718        depth->Texture != stencil->Texture) {
 719       fb->_Status = GL_FRAMEBUFFER_UNSUPPORTED_EXT;
 720       st_fbo_invalid("Different Depth/Stencil textures");
 721       return;
 722    }
 723
 724    if (!st_validate_attachment(ctx, screen, depth, PIPE_BIND_DEPTH_STENCIL)) {
 725       fb->_Status = GL_FRAMEBUFFER_UNSUPPORTED_EXT;
 726       st_fbo_invalid("Invalid depth attachment");
 727       return;
 728    }
 729    if (!st_validate_attachment(ctx, screen, stencil, PIPE_BIND_DEPTH_STENCIL)) {
 730       fb->_Status = GL_FRAMEBUFFER_UNSUPPORTED_EXT;
 731       st_fbo_invalid("Invalid stencil attachment");
 732       return;
 733    }
 734    for (i = 0; i < ctx->Const.MaxColorAttachments; i++) {
 735       struct gl_renderbuffer_attachment *att =
 736             &fb->Attachment[BUFFER_COLOR0 + i];
 737       enum pipe_format format;
 738
 739       if (!st_validate_attachment(ctx, screen, att, PIPE_BIND_RENDER_TARGET)) {
 740          fb->_Status = GL_FRAMEBUFFER_UNSUPPORTED_EXT;
 741          st_fbo_invalid("Invalid color attachment");
 742          return;
 743       }
 744
 745       if (!mixed_formats) {
 746          /* Disallow mixed formats. */
 747          if (att->Type != GL_NONE) {
 748             format = st_renderbuffer(att->Renderbuffer)->surface->format;
 749          } else {
 750             continue;
 751          }
 752
 753          if (first_format == PIPE_FORMAT_NONE) {
 754             first_format = format;
 755          } else if (format != first_format) {
 756             fb->_Status = GL_FRAMEBUFFER_UNSUPPORTED_EXT;
 757             st_fbo_invalid("Mixed color formats");
 758             return;
 759          }
 760       }
 761    }
 762 }
 763
 764
 765 /**
 766  * Called via glDrawBuffer.  We only provide this driver function so that we
 767  * can check if we need to allocate a new renderbuffer.  Specifically, we
 768  * don't usually allocate a front color buffer when using a double-buffered
 769  * visual.  But if the app calls glDrawBuffer(GL_FRONT) we need to allocate
 770  * that buffer.  Note, this is only for window system buffers, not user-
 771  * created FBOs.
 772  */
 773 static void
 774 st_DrawBufferAllocate(struct gl_context *ctx)
 775 {
 776    struct st_context *st = st_context(ctx);
 777    struct gl_framebuffer *fb = ctx->DrawBuffer;
 778
 779    if (_mesa_is_winsys_fbo(fb)) {
 780       GLuint i;
 781       /* add the renderbuffers on demand */
 782       for (i = 0; i < fb->_NumColorDrawBuffers; i++) {
 783          gl_buffer_index idx = fb->_ColorDrawBufferIndexes[i];
 784
 785          if (idx != BUFFER_NONE) {
 786             st_manager_add_color_renderbuffer(st, fb, idx);
 787          }
 788       }
 789    }
 790 }
 791
 792
 793 /**
 794  * Called via glReadBuffer.  As with st_DrawBufferAllocate, we use this
 795  * function to check if we need to allocate a renderbuffer on demand.
 796  */
 797 static void
 798 st_ReadBuffer(struct gl_context *ctx, GLenum buffer)
 799 {
 800    struct st_context *st = st_context(ctx);
 801    struct gl_framebuffer *fb = ctx->ReadBuffer;
 802
 803    (void) buffer;
 804
 805    /* Check if we need to allocate a front color buffer.
 806     * Front buffers are often allocated on demand (other color buffers are
 807     * always allocated in advance).
 808     */
 809    if ((fb->_ColorReadBufferIndex == BUFFER_FRONT_LEFT ||
 810         fb->_ColorReadBufferIndex == BUFFER_FRONT_RIGHT) &&
 811        fb->Attachment[fb->_ColorReadBufferIndex].Type == GL_NONE) {
 812       assert(_mesa_is_winsys_fbo(fb));
 813       /* add the buffer */
 814       st_manager_add_color_renderbuffer(st, fb, fb->_ColorReadBufferIndex);
 815       _mesa_update_state(ctx);
 816       st_validate_state(st, ST_PIPELINE_UPDATE_FRAMEBUFFER);
 817    }
 818 }
 819
 820
 821
 822 /**
 823  * Called via ctx->Driver.MapRenderbuffer.
 824  */
 825 static void
 826 st_MapRenderbuffer(struct gl_context *ctx,
 827                    struct gl_renderbuffer *rb,
 828                    GLuint x, GLuint y, GLuint w, GLuint h,
 829                    GLbitfield mode,
 830                    GLubyte **mapOut, GLint *rowStrideOut,
 831                    bool flip_y)
 832 {
 833    struct st_context *st = st_context(ctx);
 834    struct st_renderbuffer *strb = st_renderbuffer(rb);
 835    struct pipe_context *pipe = st->pipe;
 836    const GLboolean invert = rb->Name == 0;
 837    GLuint y2;
 838    GLubyte *map;
 839
 840    /* driver does not support GL_FRAMEBUFFER_FLIP_Y_MESA */
 841    assert((rb->Name == 0) == flip_y);
 842
 843    if (strb->software) {
 844       /* software-allocated renderbuffer (probably an accum buffer) */
 845       if (strb->data) {
 846          GLint bpp = _mesa_get_format_bytes(strb->Base.Format);
 847          GLint stride = _mesa_format_row_stride(strb->Base.Format,
 848                                                 strb->Base.Width);
 849          *mapOut = (GLubyte *) strb->data + y * stride + x * bpp;
 850          *rowStrideOut = stride;
 851       }
 852       else {
 853          *mapOut = NULL;
 854          *rowStrideOut = 0;
 855       }
 856       return;
 857    }
 858
 859    /* Check for unexpected flags */
 860    assert((mode & ~(GL_MAP_READ_BIT |
 861                     GL_MAP_WRITE_BIT |
 862                     GL_MAP_INVALIDATE_RANGE_BIT)) == 0);
 863
 864    const enum pipe_transfer_usage transfer_flags =
 865       st_access_flags_to_transfer_flags(mode, false);
 866
 867    /* Note: y=0=bottom of buffer while y2=0=top of buffer.
 868     * 'invert' will be true for window-system buffers and false for
 869     * user-allocated renderbuffers and textures.
 870     */
 871    if (invert)
 872       y2 = strb->Base.Height - y - h;
 873    else
 874       y2 = y;
 875
 876     map = pipe_transfer_map(pipe,
 877                             strb->texture,
 878                             strb->surface->u.tex.level,
 879                             strb->surface->u.tex.first_layer,
 880                             transfer_flags, x, y2, w, h, &strb->transfer);
 881    if (map) {
 882       if (invert) {
 883          *rowStrideOut = -(int) strb->transfer->stride;
 884          map += (h - 1) * strb->transfer->stride;
 885       }
 886       else {
 887          *rowStrideOut = strb->transfer->stride;
 888       }
 889       *mapOut = map;
 890    }
 891    else {
 892       *mapOut = NULL;
 893       *rowStrideOut = 0;
 894    }
 895 }
 896
 897
 898 /**
 899  * Called via ctx->Driver.UnmapRenderbuffer.
 900  */
 901 static void
 902 st_UnmapRenderbuffer(struct gl_context *ctx,
 903                      struct gl_renderbuffer *rb)
 904 {
 905    struct st_context *st = st_context(ctx);
 906    struct st_renderbuffer *strb = st_renderbuffer(rb);
 907    struct pipe_context *pipe = st->pipe;
 908
 909    if (strb->software) {
 910       /* software-allocated renderbuffer (probably an accum buffer) */
 911       return;
 912    }
 913
 914    pipe_transfer_unmap(pipe, strb->transfer);
 915    strb->transfer = NULL;
 916 }
 917
 918
 919 /**
 920  * Called via ctx->Driver.EvaluateDepthValues.
 921  */
 922 static void
 923 st_EvaluateDepthValues(struct gl_context *ctx)
 924 {
 925    struct st_context *st = st_context(ctx);
 926
 927    st_validate_state(st, ST_PIPELINE_UPDATE_FRAMEBUFFER);
 928
 929    st->pipe->evaluate_depth_buffer(st->pipe);
 930 }
 931
 932
 933 void
 934 st_init_fbo_functions(struct dd_function_table *functions)
 935 {
 936    functions->NewFramebuffer = _mesa_new_framebuffer;
 937    functions->NewRenderbuffer = st_new_renderbuffer;
 938    functions->FramebufferRenderbuffer = _mesa_FramebufferRenderbuffer_sw;
 939    functions->RenderTexture = st_render_texture;
 940    functions->FinishRenderTexture = st_finish_render_texture;
 941    functions->ValidateFramebuffer = st_validate_framebuffer;
 942
 943    functions->DrawBufferAllocate = st_DrawBufferAllocate;
 944    functions->ReadBuffer = st_ReadBuffer;
 945
 946    functions->MapRenderbuffer = st_MapRenderbuffer;
 947    functions->UnmapRenderbuffer = st_UnmapRenderbuffer;
 948    functions->EvaluateDepthValues = st_EvaluateDepthValues;
 949 }