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