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    if (util_format_is_depth_or_stencil(format)) {
 208       templ.bind = PIPE_BIND_DEPTH_STENCIL;
 209    }
 210    else if (strb->Base.Name != 0) {
 211       /* this is a user-created renderbuffer */
 212       templ.bind = PIPE_BIND_RENDER_TARGET;
 213    }
 214    else {
 215       /* this is a window-system buffer */
 216       templ.bind = (PIPE_BIND_DISPLAY_TARGET |
 217                     PIPE_BIND_RENDER_TARGET);
 218    }
 219
 220    strb->texture = screen->resource_create(screen, &templ);
 221
 222    if (!strb->texture)
 223       return FALSE;
 224
 225    st_update_renderbuffer_surface(st, strb);
 226    return strb->surface != NULL;
 227 }
 228
 229
 230 /**
 231  * gl_renderbuffer::Delete()
 232  */
 233 static void
 234 st_renderbuffer_delete(struct gl_context *ctx, struct gl_renderbuffer *rb)
 235 {
 236    struct st_renderbuffer *strb = st_renderbuffer(rb);
 237    if (ctx) {
 238       struct st_context *st = st_context(ctx);
 239       pipe_surface_release(st->pipe, &strb->surface_srgb);
 240       pipe_surface_release(st->pipe, &strb->surface_linear);
 241       strb->surface = NULL;
 242    }
 243    pipe_resource_reference(&strb->texture, NULL);
 244    free(strb->data);
 245    _mesa_delete_renderbuffer(ctx, rb);
 246 }
 247
 248
 249 /**
 250  * Called via ctx->Driver.NewRenderbuffer()
 251  */
 252 static struct gl_renderbuffer *
 253 st_new_renderbuffer(struct gl_context *ctx, GLuint name)
 254 {
 255    struct st_renderbuffer *strb = ST_CALLOC_STRUCT(st_renderbuffer);
 256    if (strb) {
 257       assert(name != 0);
 258       _mesa_init_renderbuffer(&strb->Base, name);
 259       strb->Base.Delete = st_renderbuffer_delete;
 260       strb->Base.AllocStorage = st_renderbuffer_alloc_storage;
 261       return &strb->Base;
 262    }
 263    return NULL;
 264 }
 265
 266
 267 /**
 268  * Allocate a renderbuffer for an on-screen window (not a user-created
 269  * renderbuffer).  The window system code determines the format.
 270  */
 271 struct gl_renderbuffer *
 272 st_new_renderbuffer_fb(enum pipe_format format, unsigned samples, boolean sw)
 273 {
 274    struct st_renderbuffer *strb;
 275
 276    strb = ST_CALLOC_STRUCT(st_renderbuffer);
 277    if (!strb) {
 278       _mesa_error(NULL, GL_OUT_OF_MEMORY, "creating renderbuffer");
 279       return NULL;
 280    }
 281
 282    _mesa_init_renderbuffer(&strb->Base, 0);
 283    strb->Base.ClassID = 0x4242; /* just a unique value */
 284    strb->Base.NumSamples = samples;
 285    strb->Base.Format = st_pipe_format_to_mesa_format(format);
 286    strb->Base._BaseFormat = _mesa_get_format_base_format(strb->Base.Format);
 287    strb->software = sw;
 288
 289    switch (format) {
 290    case PIPE_FORMAT_B10G10R10A2_UNORM:
 291    case PIPE_FORMAT_R10G10B10A2_UNORM:
 292       strb->Base.InternalFormat = GL_RGB10_A2;
 293       break;
 294    case PIPE_FORMAT_R10G10B10X2_UNORM:
 295    case PIPE_FORMAT_B10G10R10X2_UNORM:
 296       strb->Base.InternalFormat = GL_RGB10;
 297       break;
 298    case PIPE_FORMAT_R8G8B8A8_UNORM:
 299    case PIPE_FORMAT_B8G8R8A8_UNORM:
 300    case PIPE_FORMAT_A8R8G8B8_UNORM:
 301       strb->Base.InternalFormat = GL_RGBA8;
 302       break;
 303    case PIPE_FORMAT_R8G8B8X8_UNORM:
 304    case PIPE_FORMAT_B8G8R8X8_UNORM:
 305    case PIPE_FORMAT_X8R8G8B8_UNORM:
 306       strb->Base.InternalFormat = GL_RGB8;
 307       break;
 308    case PIPE_FORMAT_R8G8B8A8_SRGB:
 309    case PIPE_FORMAT_B8G8R8A8_SRGB:
 310    case PIPE_FORMAT_A8R8G8B8_SRGB:
 311       strb->Base.InternalFormat = GL_SRGB8_ALPHA8;
 312       break;
 313    case PIPE_FORMAT_R8G8B8X8_SRGB:
 314    case PIPE_FORMAT_B8G8R8X8_SRGB:
 315    case PIPE_FORMAT_X8R8G8B8_SRGB:
 316       strb->Base.InternalFormat = GL_SRGB8;
 317       break;
 318    case PIPE_FORMAT_B5G5R5A1_UNORM:
 319       strb->Base.InternalFormat = GL_RGB5_A1;
 320       break;
 321    case PIPE_FORMAT_B4G4R4A4_UNORM:
 322       strb->Base.InternalFormat = GL_RGBA4;
 323       break;
 324    case PIPE_FORMAT_B5G6R5_UNORM:
 325       strb->Base.InternalFormat = GL_RGB565;
 326       break;
 327    case PIPE_FORMAT_Z16_UNORM:
 328       strb->Base.InternalFormat = GL_DEPTH_COMPONENT16;
 329       break;
 330    case PIPE_FORMAT_Z32_UNORM:
 331       strb->Base.InternalFormat = GL_DEPTH_COMPONENT32;
 332       break;
 333    case PIPE_FORMAT_Z24_UNORM_S8_UINT:
 334    case PIPE_FORMAT_S8_UINT_Z24_UNORM:
 335       strb->Base.InternalFormat = GL_DEPTH24_STENCIL8_EXT;
 336       break;
 337    case PIPE_FORMAT_Z24X8_UNORM:
 338    case PIPE_FORMAT_X8Z24_UNORM:
 339       strb->Base.InternalFormat = GL_DEPTH_COMPONENT24;
 340       break;
 341    case PIPE_FORMAT_S8_UINT:
 342       strb->Base.InternalFormat = GL_STENCIL_INDEX8_EXT;
 343       break;
 344    case PIPE_FORMAT_R16G16B16A16_SNORM:
 345       /* accum buffer */
 346       strb->Base.InternalFormat = GL_RGBA16_SNORM;
 347       break;
 348    case PIPE_FORMAT_R16G16B16A16_UNORM:
 349       strb->Base.InternalFormat = GL_RGBA16;
 350       break;
 351    case PIPE_FORMAT_R8_UNORM:
 352       strb->Base.InternalFormat = GL_R8;
 353       break;
 354    case PIPE_FORMAT_R8G8_UNORM:
 355       strb->Base.InternalFormat = GL_RG8;
 356       break;
 357    case PIPE_FORMAT_R16_UNORM:
 358       strb->Base.InternalFormat = GL_R16;
 359       break;
 360    case PIPE_FORMAT_R16G16_UNORM:
 361       strb->Base.InternalFormat = GL_RG16;
 362       break;
 363    case PIPE_FORMAT_R32G32B32A32_FLOAT:
 364       strb->Base.InternalFormat = GL_RGBA32F;
 365       break;
 366    case PIPE_FORMAT_R16G16B16A16_FLOAT:
 367       strb->Base.InternalFormat = GL_RGBA16F;
 368       break;
 369    default:
 370       _mesa_problem(NULL,
 371                     "Unexpected format %s in st_new_renderbuffer_fb",
 372                     util_format_name(format));
 373       free(strb);
 374       return NULL;
 375    }
 376
 377    /* st-specific methods */
 378    strb->Base.Delete = st_renderbuffer_delete;
 379    strb->Base.AllocStorage = st_renderbuffer_alloc_storage;
 380
 381    /* surface is allocated in st_renderbuffer_alloc_storage() */
 382    strb->surface = NULL;
 383
 384    return &strb->Base;
 385 }
 386
 387
 388 /**
 389  * Create or update the pipe_surface of a FBO renderbuffer.
 390  * This is usually called after st_finalize_texture.
 391  */
 392 void
 393 st_update_renderbuffer_surface(struct st_context *st,
 394                                struct st_renderbuffer *strb)
 395 {
 396    struct pipe_context *pipe = st->pipe;
 397    struct pipe_resource *resource = strb->texture;
 398    const struct st_texture_object *stTexObj = NULL;
 399    unsigned rtt_width = strb->Base.Width;
 400    unsigned rtt_height = strb->Base.Height;
 401    unsigned rtt_depth = strb->Base.Depth;
 402
 403    /*
 404     * For winsys fbo, it is possible that the renderbuffer is sRGB-capable but
 405     * the format of strb->texture is linear (because we have no control over
 406     * the format).  Check strb->Base.Format instead of strb->texture->format
 407     * to determine if the rb is sRGB-capable.
 408     */
 409    boolean enable_srgb = st->ctx->Color.sRGBEnabled &&
 410       _mesa_get_format_color_encoding(strb->Base.Format) == GL_SRGB;
 411    enum pipe_format format = resource->format;
 412
 413    if (strb->is_rtt) {
 414       stTexObj = st_texture_object(strb->Base.TexImage->TexObject);
 415       if (stTexObj->surface_based)
 416          format = stTexObj->surface_format;
 417    }
 418
 419    format = enable_srgb ? util_format_srgb(format) : util_format_linear(format);
 420
 421    if (resource->target == PIPE_TEXTURE_1D_ARRAY) {
 422       rtt_depth = rtt_height;
 423       rtt_height = 1;
 424    }
 425
 426    /* find matching mipmap level size */
 427    unsigned level;
 428    for (level = 0; level <= resource->last_level; level++) {
 429       if (u_minify(resource->width0, level) == rtt_width &&
 430           u_minify(resource->height0, level) == rtt_height &&
 431           (resource->target != PIPE_TEXTURE_3D ||
 432            u_minify(resource->depth0, level) == rtt_depth)) {
 433          break;
 434       }
 435    }
 436    assert(level <= resource->last_level);
 437
 438    /* determine the layer bounds */
 439    unsigned first_layer, last_layer;
 440    if (strb->rtt_layered) {
 441       first_layer = 0;
 442       last_layer = util_max_layer(strb->texture, level);
 443    }
 444    else {
 445       first_layer =
 446       last_layer = strb->rtt_face + strb->rtt_slice;
 447    }
 448
 449    /* Adjust for texture views */
 450    if (strb->is_rtt && resource->array_size > 1 &&
 451        stTexObj->base.Immutable) {
 452       const struct gl_texture_object *tex = &stTexObj->base;
 453       first_layer += tex->MinLayer;
 454       if (!strb->rtt_layered)
 455          last_layer += tex->MinLayer;
 456       else
 457          last_layer = MIN2(first_layer + tex->NumLayers - 1, last_layer);
 458    }
 459
 460    struct pipe_surface **psurf =
 461       enable_srgb ? &strb->surface_srgb : &strb->surface_linear;
 462    struct pipe_surface *surf = *psurf;
 463
 464    if (!surf ||
 465        surf->texture->nr_samples != strb->Base.NumSamples ||
 466        surf->format != format ||
 467        surf->texture != resource ||
 468        surf->width != rtt_width ||
 469        surf->height != rtt_height ||
 470        surf->u.tex.level != level ||
 471        surf->u.tex.first_layer != first_layer ||
 472        surf->u.tex.last_layer != last_layer) {
 473       /* create a new pipe_surface */
 474       struct pipe_surface surf_tmpl;
 475       memset(&surf_tmpl, 0, sizeof(surf_tmpl));
 476       surf_tmpl.format = format;
 477       surf_tmpl.u.tex.level = level;
 478       surf_tmpl.u.tex.first_layer = first_layer;
 479       surf_tmpl.u.tex.last_layer = last_layer;
 480
 481       pipe_surface_release(pipe, psurf);
 482
 483       *psurf = pipe->create_surface(pipe, resource, &surf_tmpl);
 484    }
 485    strb->surface = *psurf;
 486 }
 487
 488
 489 /**
 490  * Return the pipe_resource which stores a particular texture image.
 491  */
 492 static struct pipe_resource *
 493 get_teximage_resource(struct gl_texture_object *texObj,
 494                       unsigned face, unsigned level)
 495 {
 496    struct st_texture_image *stImg =
 497       st_texture_image(texObj->Image[face][level]);
 498
 499    return stImg->pt;
 500 }
 501
 502
 503 /**
 504  * Called by ctx->Driver.RenderTexture
 505  */
 506 static void
 507 st_render_texture(struct gl_context *ctx,
 508                   struct gl_framebuffer *fb,
 509                   struct gl_renderbuffer_attachment *att)
 510 {
 511    struct st_context *st = st_context(ctx);
 512    struct gl_renderbuffer *rb = att->Renderbuffer;
 513    struct st_renderbuffer *strb = st_renderbuffer(rb);
 514    struct pipe_resource *pt;
 515
 516    pt = get_teximage_resource(att->Texture,
 517                               att->CubeMapFace,
 518                               att->TextureLevel);
 519    assert(pt);
 520
 521    /* point renderbuffer at texobject */
 522    strb->is_rtt = TRUE;
 523    strb->rtt_face = att->CubeMapFace;
 524    strb->rtt_slice = att->Zoffset;
 525    strb->rtt_layered = att->Layered;
 526    pipe_resource_reference(&strb->texture, pt);
 527
 528    st_update_renderbuffer_surface(st, strb);
 529
 530    /* Invalidate buffer state so that the pipe's framebuffer state
 531     * gets updated.
 532     * That's where the new renderbuffer (which we just created) gets
 533     * passed to the pipe as a (color/depth) render target.
 534     */
 535    st_invalidate_buffers(st);
 536
 537
 538    /* Need to trigger a call to update_framebuffer() since we just
 539     * attached a new renderbuffer.
 540     */
 541    ctx->NewState |= _NEW_BUFFERS;
 542 }
 543
 544
 545 /**
 546  * Called via ctx->Driver.FinishRenderTexture.
 547  */
 548 static void
 549 st_finish_render_texture(struct gl_context *ctx, struct gl_renderbuffer *rb)
 550 {
 551    struct st_context *st = st_context(ctx);
 552    struct st_renderbuffer *strb = st_renderbuffer(rb);
 553
 554    if (!strb)
 555       return;
 556
 557    strb->is_rtt = FALSE;
 558
 559    /* restore previous framebuffer state */
 560    st_invalidate_buffers(st);
 561 }
 562
 563
 564 /** Debug helper */
 565 static void
 566 st_fbo_invalid(const char *reason)
 567 {
 568    if (MESA_DEBUG_FLAGS & DEBUG_INCOMPLETE_FBO) {
 569       _mesa_debug(NULL, "Invalid FBO: %s\n", reason);
 570    }
 571 }
 572
 573
 574 /**
 575  * Validate a renderbuffer attachment for a particular set of bindings.
 576  */
 577 static GLboolean
 578 st_validate_attachment(struct gl_context *ctx,
 579                        struct pipe_screen *screen,
 580                        const struct gl_renderbuffer_attachment *att,
 581                        unsigned bindings)
 582 {
 583    const struct st_texture_object *stObj = st_texture_object(att->Texture);
 584    enum pipe_format format;
 585    mesa_format texFormat;
 586    GLboolean valid;
 587
 588    /* Sanity check: we must be binding the surface as a (color) render target
 589     * or depth/stencil target.
 590     */
 591    assert(bindings == PIPE_BIND_RENDER_TARGET ||
 592           bindings == PIPE_BIND_DEPTH_STENCIL);
 593
 594    /* Only validate texture attachments for now, since
 595     * st_renderbuffer_alloc_storage makes sure that
 596     * the format is supported.
 597     */
 598    if (att->Type != GL_TEXTURE)
 599       return GL_TRUE;
 600
 601    if (!stObj || !stObj->pt)
 602       return GL_FALSE;
 603
 604    format = stObj->pt->format;
 605    texFormat = att->Renderbuffer->TexImage->TexFormat;
 606
 607    /* If the encoding is sRGB and sRGB rendering cannot be enabled,
 608     * check for linear format support instead.
 609     * Later when we create a surface, we change the format to a linear one. */
 610    if (!ctx->Extensions.EXT_framebuffer_sRGB &&
 611        _mesa_get_format_color_encoding(texFormat) == GL_SRGB) {
 612       const mesa_format linearFormat = _mesa_get_srgb_format_linear(texFormat);
 613       format = st_mesa_format_to_pipe_format(st_context(ctx), linearFormat);
 614    }
 615
 616    valid = screen->is_format_supported(screen, format,
 617                                       PIPE_TEXTURE_2D,
 618                                       stObj->pt->nr_samples, bindings);
 619    if (!valid) {
 620       st_fbo_invalid("Invalid format");
 621    }
 622
 623    return valid;
 624 }
 625
 626
 627 /**
 628  * Check that the framebuffer configuration is valid in terms of what
 629  * the driver can support.
 630  *
 631  * For Gallium we only supports combined Z+stencil, not separate buffers.
 632  */
 633 static void
 634 st_validate_framebuffer(struct gl_context *ctx, struct gl_framebuffer *fb)
 635 {
 636    struct st_context *st = st_context(ctx);
 637    struct pipe_screen *screen = st->pipe->screen;
 638    const struct gl_renderbuffer_attachment *depth =
 639          &fb->Attachment[BUFFER_DEPTH];
 640    const struct gl_renderbuffer_attachment *stencil =
 641          &fb->Attachment[BUFFER_STENCIL];
 642    GLuint i;
 643    enum pipe_format first_format = PIPE_FORMAT_NONE;
 644    boolean mixed_formats =
 645          screen->get_param(screen, PIPE_CAP_MIXED_COLORBUFFER_FORMATS) != 0;
 646
 647    if (depth->Type && stencil->Type && depth->Type != stencil->Type) {
 648       st_fbo_invalid("Different Depth/Stencil buffer formats");
 649       fb->_Status = GL_FRAMEBUFFER_UNSUPPORTED_EXT;
 650       return;
 651    }
 652    if (depth->Type == GL_RENDERBUFFER_EXT &&
 653        stencil->Type == GL_RENDERBUFFER_EXT &&
 654        depth->Renderbuffer != stencil->Renderbuffer) {
 655       st_fbo_invalid("Separate Depth/Stencil buffers");
 656       fb->_Status = GL_FRAMEBUFFER_UNSUPPORTED_EXT;
 657       return;
 658    }
 659    if (depth->Type == GL_TEXTURE &&
 660        stencil->Type == GL_TEXTURE &&
 661        depth->Texture != stencil->Texture) {
 662       fb->_Status = GL_FRAMEBUFFER_UNSUPPORTED_EXT;
 663       st_fbo_invalid("Different Depth/Stencil textures");
 664       return;
 665    }
 666
 667    if (!st_validate_attachment(ctx, screen, depth, PIPE_BIND_DEPTH_STENCIL)) {
 668       fb->_Status = GL_FRAMEBUFFER_UNSUPPORTED_EXT;
 669       st_fbo_invalid("Invalid depth attachment");
 670       return;
 671    }
 672    if (!st_validate_attachment(ctx, screen, stencil, PIPE_BIND_DEPTH_STENCIL)) {
 673       fb->_Status = GL_FRAMEBUFFER_UNSUPPORTED_EXT;
 674       st_fbo_invalid("Invalid stencil attachment");
 675       return;
 676    }
 677    for (i = 0; i < ctx->Const.MaxColorAttachments; i++) {
 678       struct gl_renderbuffer_attachment *att =
 679             &fb->Attachment[BUFFER_COLOR0 + i];
 680       enum pipe_format format;
 681
 682       if (!st_validate_attachment(ctx, screen, att, PIPE_BIND_RENDER_TARGET)) {
 683          fb->_Status = GL_FRAMEBUFFER_UNSUPPORTED_EXT;
 684          st_fbo_invalid("Invalid color attachment");
 685          return;
 686       }
 687
 688       if (!mixed_formats) {
 689          /* Disallow mixed formats. */
 690          if (att->Type != GL_NONE) {
 691             format = st_renderbuffer(att->Renderbuffer)->surface->format;
 692          } else {
 693             continue;
 694          }
 695
 696          if (first_format == PIPE_FORMAT_NONE) {
 697             first_format = format;
 698          } else if (format != first_format) {
 699             fb->_Status = GL_FRAMEBUFFER_UNSUPPORTED_EXT;
 700             st_fbo_invalid("Mixed color formats");
 701             return;
 702          }
 703       }
 704    }
 705 }
 706
 707
 708 /**
 709  * Called via glDrawBuffer.  We only provide this driver function so that we
 710  * can check if we need to allocate a new renderbuffer.  Specifically, we
 711  * don't usually allocate a front color buffer when using a double-buffered
 712  * visual.  But if the app calls glDrawBuffer(GL_FRONT) we need to allocate
 713  * that buffer.  Note, this is only for window system buffers, not user-
 714  * created FBOs.
 715  */
 716 static void
 717 st_DrawBufferAllocate(struct gl_context *ctx)
 718 {
 719    struct st_context *st = st_context(ctx);
 720    struct gl_framebuffer *fb = ctx->DrawBuffer;
 721
 722    if (_mesa_is_winsys_fbo(fb)) {
 723       GLuint i;
 724       /* add the renderbuffers on demand */
 725       for (i = 0; i < fb->_NumColorDrawBuffers; i++) {
 726          gl_buffer_index idx = fb->_ColorDrawBufferIndexes[i];
 727
 728          if (idx != BUFFER_NONE) {
 729             st_manager_add_color_renderbuffer(st, fb, idx);
 730          }
 731       }
 732    }
 733 }
 734
 735
 736 /**
 737  * Called via glReadBuffer.  As with st_DrawBufferAllocate, we use this
 738  * function to check if we need to allocate a renderbuffer on demand.
 739  */
 740 static void
 741 st_ReadBuffer(struct gl_context *ctx, GLenum buffer)
 742 {
 743    struct st_context *st = st_context(ctx);
 744    struct gl_framebuffer *fb = ctx->ReadBuffer;
 745
 746    (void) buffer;
 747
 748    /* Check if we need to allocate a front color buffer.
 749     * Front buffers are often allocated on demand (other color buffers are
 750     * always allocated in advance).
 751     */
 752    if ((fb->_ColorReadBufferIndex == BUFFER_FRONT_LEFT ||
 753         fb->_ColorReadBufferIndex == BUFFER_FRONT_RIGHT) &&
 754        fb->Attachment[fb->_ColorReadBufferIndex].Type == GL_NONE) {
 755       assert(_mesa_is_winsys_fbo(fb));
 756       /* add the buffer */
 757       st_manager_add_color_renderbuffer(st, fb, fb->_ColorReadBufferIndex);
 758       _mesa_update_state(ctx);
 759       st_validate_state(st, ST_PIPELINE_UPDATE_FRAMEBUFFER);
 760    }
 761 }
 762
 763
 764
 765 /**
 766  * Called via ctx->Driver.MapRenderbuffer.
 767  */
 768 static void
 769 st_MapRenderbuffer(struct gl_context *ctx,
 770                    struct gl_renderbuffer *rb,
 771                    GLuint x, GLuint y, GLuint w, GLuint h,
 772                    GLbitfield mode,
 773                    GLubyte **mapOut, GLint *rowStrideOut,
 774                    bool flip_y)
 775 {
 776    struct st_context *st = st_context(ctx);
 777    struct st_renderbuffer *strb = st_renderbuffer(rb);
 778    struct pipe_context *pipe = st->pipe;
 779    const GLboolean invert = rb->Name == 0;
 780    GLuint y2;
 781    GLubyte *map;
 782
 783    /* driver does not support GL_FRAMEBUFFER_FLIP_Y_MESA */
 784    assert((rb->Name == 0) == flip_y);
 785
 786    if (strb->software) {
 787       /* software-allocated renderbuffer (probably an accum buffer) */
 788       if (strb->data) {
 789          GLint bpp = _mesa_get_format_bytes(strb->Base.Format);
 790          GLint stride = _mesa_format_row_stride(strb->Base.Format,
 791                                                 strb->Base.Width);
 792          *mapOut = (GLubyte *) strb->data + y * stride + x * bpp;
 793          *rowStrideOut = stride;
 794       }
 795       else {
 796          *mapOut = NULL;
 797          *rowStrideOut = 0;
 798       }
 799       return;
 800    }
 801
 802    /* Check for unexpected flags */
 803    assert((mode & ~(GL_MAP_READ_BIT |
 804                     GL_MAP_WRITE_BIT |
 805                     GL_MAP_INVALIDATE_RANGE_BIT)) == 0);
 806
 807    const enum pipe_transfer_usage transfer_flags =
 808       st_access_flags_to_transfer_flags(mode, false);
 809
 810    /* Note: y=0=bottom of buffer while y2=0=top of buffer.
 811     * 'invert' will be true for window-system buffers and false for
 812     * user-allocated renderbuffers and textures.
 813     */
 814    if (invert)
 815       y2 = strb->Base.Height - y - h;
 816    else
 817       y2 = y;
 818
 819     map = pipe_transfer_map(pipe,
 820                             strb->texture,
 821                             strb->surface->u.tex.level,
 822                             strb->surface->u.tex.first_layer,
 823                             transfer_flags, x, y2, w, h, &strb->transfer);
 824    if (map) {
 825       if (invert) {
 826          *rowStrideOut = -(int) strb->transfer->stride;
 827          map += (h - 1) * strb->transfer->stride;
 828       }
 829       else {
 830          *rowStrideOut = strb->transfer->stride;
 831       }
 832       *mapOut = map;
 833    }
 834    else {
 835       *mapOut = NULL;
 836       *rowStrideOut = 0;
 837    }
 838 }
 839
 840
 841 /**
 842  * Called via ctx->Driver.UnmapRenderbuffer.
 843  */
 844 static void
 845 st_UnmapRenderbuffer(struct gl_context *ctx,
 846                      struct gl_renderbuffer *rb)
 847 {
 848    struct st_context *st = st_context(ctx);
 849    struct st_renderbuffer *strb = st_renderbuffer(rb);
 850    struct pipe_context *pipe = st->pipe;
 851
 852    if (strb->software) {
 853       /* software-allocated renderbuffer (probably an accum buffer) */
 854       return;
 855    }
 856
 857    pipe_transfer_unmap(pipe, strb->transfer);
 858    strb->transfer = NULL;
 859 }
 860
 861
 862 /**
 863  * Called via ctx->Driver.EvaluateDepthValues.
 864  */
 865 static void
 866 st_EvaluateDepthValues(struct gl_context *ctx)
 867 {
 868    struct st_context *st = st_context(ctx);
 869
 870    st_validate_state(st, ST_PIPELINE_UPDATE_FRAMEBUFFER);
 871
 872    st->pipe->evaluate_depth_buffer(st->pipe);
 873 }
 874
 875
 876 void
 877 st_init_fbo_functions(struct dd_function_table *functions)
 878 {
 879    functions->NewFramebuffer = _mesa_new_framebuffer;
 880    functions->NewRenderbuffer = st_new_renderbuffer;
 881    functions->FramebufferRenderbuffer = _mesa_FramebufferRenderbuffer_sw;
 882    functions->RenderTexture = st_render_texture;
 883    functions->FinishRenderTexture = st_finish_render_texture;
 884    functions->ValidateFramebuffer = st_validate_framebuffer;
 885
 886    functions->DrawBufferAllocate = st_DrawBufferAllocate;
 887    functions->ReadBuffer = st_ReadBuffer;
 888
 889    functions->MapRenderbuffer = st_MapRenderbuffer;
 890    functions->UnmapRenderbuffer = st_UnmapRenderbuffer;
 891    functions->EvaluateDepthValues = st_EvaluateDepthValues;
 892 }