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_fbo.h"
  51 #include "st_cb_flush.h"
  52 #include "st_cb_texture.h"
  53 #include "st_format.h"
  54 #include "st_texture.h"
  55 #include "st_manager.h"
  56
  57 #include "util/u_format.h"
  58 #include "util/u_inlines.h"
  59 #include "util/u_surface.h"
  60
  61
  62 static GLboolean
  63 st_renderbuffer_alloc_sw_storage(struct gl_context * ctx,
  64                                  struct gl_renderbuffer *rb,
  65                                  GLenum internalFormat,
  66                                  GLuint width, GLuint height)
  67 {
  68    struct st_context *st = st_context(ctx);
  69    struct st_renderbuffer *strb = st_renderbuffer(rb);
  70    enum pipe_format format;
  71    size_t size;
  72
  73    free(strb->data);
  74    strb->data = NULL;
  75
  76    if (internalFormat == GL_RGBA16_SNORM) {
  77       /* Special case for software accum buffers.  Otherwise, if the
  78        * call to st_choose_renderbuffer_format() fails (because the
  79        * driver doesn't support signed 16-bit/channel colors) we'd
  80        * just return without allocating the software accum buffer.
  81        */
  82       format = PIPE_FORMAT_R16G16B16A16_SNORM;
  83    }
  84    else {
  85       format = st_choose_renderbuffer_format(st, internalFormat, 0);
  86
  87       /* Not setting gl_renderbuffer::Format here will cause
  88        * FRAMEBUFFER_UNSUPPORTED and ValidateFramebuffer will not be called.
  89        */
  90       if (format == PIPE_FORMAT_NONE) {
  91          return GL_TRUE;
  92       }
  93    }
  94
  95    strb->Base.Format = st_pipe_format_to_mesa_format(format);
  96
  97    size = _mesa_format_image_size(strb->Base.Format, width, height, 1);
  98    strb->data = malloc(size);
  99    return strb->data != NULL;
 100 }
 101
 102
 103 /**
 104  * gl_renderbuffer::AllocStorage()
 105  * This is called to allocate the original drawing surface, and
 106  * during window resize.
 107  */
 108 static GLboolean
 109 st_renderbuffer_alloc_storage(struct gl_context * ctx,
 110                               struct gl_renderbuffer *rb,
 111                               GLenum internalFormat,
 112                               GLuint width, GLuint height)
 113 {
 114    struct st_context *st = st_context(ctx);
 115    struct pipe_screen *screen = st->pipe->screen;
 116    struct st_renderbuffer *strb = st_renderbuffer(rb);
 117    enum pipe_format format = PIPE_FORMAT_NONE;
 118    struct pipe_resource templ;
 119
 120    /* init renderbuffer fields */
 121    strb->Base.Width  = width;
 122    strb->Base.Height = height;
 123    strb->Base._BaseFormat = _mesa_base_fbo_format(ctx, internalFormat);
 124    strb->defined = GL_FALSE;  /* undefined contents now */
 125
 126    if (strb->software) {
 127       return st_renderbuffer_alloc_sw_storage(ctx, rb, internalFormat,
 128                                               width, height);
 129    }
 130
 131    /* Free the old surface and texture
 132     */
 133    pipe_surface_reference(&strb->surface_srgb, NULL);
 134    pipe_surface_reference(&strb->surface_linear, NULL);
 135    strb->surface = NULL;
 136    pipe_resource_reference(&strb->texture, NULL);
 137
 138    /* If an sRGB framebuffer is unsupported, sRGB formats behave like linear
 139     * formats.
 140     */
 141    if (!ctx->Extensions.EXT_framebuffer_sRGB) {
 142       internalFormat = _mesa_get_linear_internalformat(internalFormat);
 143    }
 144
 145    /* Handle multisample renderbuffers first.
 146     *
 147     * From ARB_framebuffer_object:
 148     *   If <samples> is zero, then RENDERBUFFER_SAMPLES is set to zero.
 149     *   Otherwise <samples> represents a request for a desired minimum
 150     *   number of samples. Since different implementations may support
 151     *   different sample counts for multisampled rendering, the actual
 152     *   number of samples allocated for the renderbuffer image is
 153     *   implementation dependent.  However, the resulting value for
 154     *   RENDERBUFFER_SAMPLES is guaranteed to be greater than or equal
 155     *   to <samples> and no more than the next larger sample count supported
 156     *   by the implementation.
 157     *
 158     * Find the supported number of samples >= rb->NumSamples
 159     */
 160    if (rb->NumSamples > 0) {
 161       unsigned start, i;
 162
 163       if (ctx->Const.MaxSamples > 1 &&  rb->NumSamples == 1) {
 164          /* don't try num_samples = 1 with drivers that support real msaa */
 165          start = 2;
 166       } else {
 167          start = rb->NumSamples;
 168       }
 169
 170       for (i = start; i <= ctx->Const.MaxSamples; i++) {
 171          format = st_choose_renderbuffer_format(st, internalFormat, i);
 172
 173          if (format != PIPE_FORMAT_NONE) {
 174             rb->NumSamples = i;
 175             break;
 176          }
 177       }
 178    } else {
 179       format = st_choose_renderbuffer_format(st, internalFormat, 0);
 180    }
 181
 182    /* Not setting gl_renderbuffer::Format here will cause
 183     * FRAMEBUFFER_UNSUPPORTED and ValidateFramebuffer will not be called.
 184     */
 185    if (format == PIPE_FORMAT_NONE) {
 186       return GL_TRUE;
 187    }
 188
 189    strb->Base.Format = st_pipe_format_to_mesa_format(format);
 190
 191    if (width == 0 || height == 0) {
 192       /* if size is zero, nothing to allocate */
 193       return GL_TRUE;
 194    }
 195
 196    /* Setup new texture template.
 197     */
 198    memset(&templ, 0, sizeof(templ));
 199    templ.target = st->internal_target;
 200    templ.format = format;
 201    templ.width0 = width;
 202    templ.height0 = height;
 203    templ.depth0 = 1;
 204    templ.array_size = 1;
 205    templ.nr_samples = rb->NumSamples;
 206    if (util_format_is_depth_or_stencil(format)) {
 207       templ.bind = PIPE_BIND_DEPTH_STENCIL;
 208    }
 209    else if (strb->Base.Name != 0) {
 210       /* this is a user-created renderbuffer */
 211       templ.bind = PIPE_BIND_RENDER_TARGET;
 212    }
 213    else {
 214       /* this is a window-system buffer */
 215       templ.bind = (PIPE_BIND_DISPLAY_TARGET |
 216                     PIPE_BIND_RENDER_TARGET);
 217    }
 218
 219    strb->texture = screen->resource_create(screen, &templ);
 220
 221    if (!strb->texture)
 222       return FALSE;
 223
 224    st_update_renderbuffer_surface(st, strb);
 225    return strb->surface != NULL;
 226 }
 227
 228
 229 /**
 230  * gl_renderbuffer::Delete()
 231  */
 232 static void
 233 st_renderbuffer_delete(struct gl_context *ctx, struct gl_renderbuffer *rb)
 234 {
 235    struct st_renderbuffer *strb = st_renderbuffer(rb);
 236    if (ctx) {
 237       struct st_context *st = st_context(ctx);
 238       pipe_surface_release(st->pipe, &strb->surface_srgb);
 239       pipe_surface_release(st->pipe, &strb->surface_linear);
 240       strb->surface = NULL;
 241    }
 242    pipe_resource_reference(&strb->texture, NULL);
 243    free(strb->data);
 244    _mesa_delete_renderbuffer(ctx, rb);
 245 }
 246
 247
 248 /**
 249  * Called via ctx->Driver.NewRenderbuffer()
 250  */
 251 static struct gl_renderbuffer *
 252 st_new_renderbuffer(struct gl_context *ctx, GLuint name)
 253 {
 254    struct st_renderbuffer *strb = ST_CALLOC_STRUCT(st_renderbuffer);
 255    if (strb) {
 256       assert(name != 0);
 257       _mesa_init_renderbuffer(&strb->Base, name);
 258       strb->Base.Delete = st_renderbuffer_delete;
 259       strb->Base.AllocStorage = st_renderbuffer_alloc_storage;
 260       return &strb->Base;
 261    }
 262    return NULL;
 263 }
 264
 265
 266 /**
 267  * Allocate a renderbuffer for an on-screen window (not a user-created
 268  * renderbuffer).  The window system code determines the format.
 269  */
 270 struct gl_renderbuffer *
 271 st_new_renderbuffer_fb(enum pipe_format format, int samples, boolean sw)
 272 {
 273    struct st_renderbuffer *strb;
 274
 275    strb = ST_CALLOC_STRUCT(st_renderbuffer);
 276    if (!strb) {
 277       _mesa_error(NULL, GL_OUT_OF_MEMORY, "creating renderbuffer");
 278       return NULL;
 279    }
 280
 281    _mesa_init_renderbuffer(&strb->Base, 0);
 282    strb->Base.ClassID = 0x4242; /* just a unique value */
 283    strb->Base.NumSamples = samples;
 284    strb->Base.Format = st_pipe_format_to_mesa_format(format);
 285    strb->Base._BaseFormat = _mesa_get_format_base_format(strb->Base.Format);
 286    strb->software = sw;
 287
 288    switch (format) {
 289    case PIPE_FORMAT_B10G10R10A2_UNORM:
 290       strb->Base.InternalFormat = GL_RGB10_A2;
 291       break;
 292    case PIPE_FORMAT_B10G10R10X2_UNORM:
 293       strb->Base.InternalFormat = GL_RGB10;
 294       break;
 295    case PIPE_FORMAT_R8G8B8A8_UNORM:
 296    case PIPE_FORMAT_B8G8R8A8_UNORM:
 297    case PIPE_FORMAT_A8R8G8B8_UNORM:
 298       strb->Base.InternalFormat = GL_RGBA8;
 299       break;
 300    case PIPE_FORMAT_R8G8B8X8_UNORM:
 301    case PIPE_FORMAT_B8G8R8X8_UNORM:
 302    case PIPE_FORMAT_X8R8G8B8_UNORM:
 303       strb->Base.InternalFormat = GL_RGB8;
 304       break;
 305    case PIPE_FORMAT_R8G8B8A8_SRGB:
 306    case PIPE_FORMAT_B8G8R8A8_SRGB:
 307    case PIPE_FORMAT_A8R8G8B8_SRGB:
 308       strb->Base.InternalFormat = GL_SRGB8_ALPHA8;
 309       break;
 310    case PIPE_FORMAT_R8G8B8X8_SRGB:
 311    case PIPE_FORMAT_B8G8R8X8_SRGB:
 312    case PIPE_FORMAT_X8R8G8B8_SRGB:
 313       strb->Base.InternalFormat = GL_SRGB8;
 314       break;
 315    case PIPE_FORMAT_B5G5R5A1_UNORM:
 316       strb->Base.InternalFormat = GL_RGB5_A1;
 317       break;
 318    case PIPE_FORMAT_B4G4R4A4_UNORM:
 319       strb->Base.InternalFormat = GL_RGBA4;
 320       break;
 321    case PIPE_FORMAT_B5G6R5_UNORM:
 322       strb->Base.InternalFormat = GL_RGB565;
 323       break;
 324    case PIPE_FORMAT_Z16_UNORM:
 325       strb->Base.InternalFormat = GL_DEPTH_COMPONENT16;
 326       break;
 327    case PIPE_FORMAT_Z32_UNORM:
 328       strb->Base.InternalFormat = GL_DEPTH_COMPONENT32;
 329       break;
 330    case PIPE_FORMAT_Z24_UNORM_S8_UINT:
 331    case PIPE_FORMAT_S8_UINT_Z24_UNORM:
 332       strb->Base.InternalFormat = GL_DEPTH24_STENCIL8_EXT;
 333       break;
 334    case PIPE_FORMAT_Z24X8_UNORM:
 335    case PIPE_FORMAT_X8Z24_UNORM:
 336       strb->Base.InternalFormat = GL_DEPTH_COMPONENT24;
 337       break;
 338    case PIPE_FORMAT_S8_UINT:
 339       strb->Base.InternalFormat = GL_STENCIL_INDEX8_EXT;
 340       break;
 341    case PIPE_FORMAT_R16G16B16A16_SNORM:
 342       /* accum buffer */
 343       strb->Base.InternalFormat = GL_RGBA16_SNORM;
 344       break;
 345    case PIPE_FORMAT_R16G16B16A16_UNORM:
 346       strb->Base.InternalFormat = GL_RGBA16;
 347       break;
 348    case PIPE_FORMAT_R8_UNORM:
 349       strb->Base.InternalFormat = GL_R8;
 350       break;
 351    case PIPE_FORMAT_R8G8_UNORM:
 352       strb->Base.InternalFormat = GL_RG8;
 353       break;
 354    case PIPE_FORMAT_R16_UNORM:
 355       strb->Base.InternalFormat = GL_R16;
 356       break;
 357    case PIPE_FORMAT_R16G16_UNORM:
 358       strb->Base.InternalFormat = GL_RG16;
 359       break;
 360    case PIPE_FORMAT_R32G32B32A32_FLOAT:
 361       strb->Base.InternalFormat = GL_RGBA32F;
 362       break;
 363    case PIPE_FORMAT_R16G16B16A16_FLOAT:
 364       strb->Base.InternalFormat = GL_RGBA16F;
 365       break;
 366    default:
 367       _mesa_problem(NULL,
 368                     "Unexpected format %s in st_new_renderbuffer_fb",
 369                     util_format_name(format));
 370       free(strb);
 371       return NULL;
 372    }
 373
 374    /* st-specific methods */
 375    strb->Base.Delete = st_renderbuffer_delete;
 376    strb->Base.AllocStorage = st_renderbuffer_alloc_storage;
 377
 378    /* surface is allocated in st_renderbuffer_alloc_storage() */
 379    strb->surface = NULL;
 380
 381    return &strb->Base;
 382 }
 383
 384
 385 /**
 386  * Create or update the pipe_surface of a FBO renderbuffer.
 387  * This is usually called after st_finalize_texture.
 388  */
 389 void
 390 st_update_renderbuffer_surface(struct st_context *st,
 391                                struct st_renderbuffer *strb)
 392 {
 393    struct pipe_context *pipe = st->pipe;
 394    struct pipe_resource *resource = strb->texture;
 395    const struct st_texture_object *stTexObj = NULL;
 396    unsigned rtt_width = strb->Base.Width;
 397    unsigned rtt_height = strb->Base.Height;
 398    unsigned rtt_depth = strb->Base.Depth;
 399
 400    /*
 401     * For winsys fbo, it is possible that the renderbuffer is sRGB-capable but
 402     * the format of strb->texture is linear (because we have no control over
 403     * the format).  Check strb->Base.Format instead of strb->texture->format
 404     * to determine if the rb is sRGB-capable.
 405     */
 406    boolean enable_srgb = st->ctx->Color.sRGBEnabled &&
 407       _mesa_get_format_color_encoding(strb->Base.Format) == GL_SRGB;
 408    enum pipe_format format = resource->format;
 409
 410    if (strb->is_rtt) {
 411       stTexObj = st_texture_object(strb->Base.TexImage->TexObject);
 412       if (stTexObj->surface_based)
 413          format = stTexObj->surface_format;
 414    }
 415
 416    format = enable_srgb ? util_format_srgb(format) : util_format_linear(format);
 417
 418    if (resource->target == PIPE_TEXTURE_1D_ARRAY) {
 419       rtt_depth = rtt_height;
 420       rtt_height = 1;
 421    }
 422
 423    /* find matching mipmap level size */
 424    unsigned level;
 425    for (level = 0; level <= resource->last_level; level++) {
 426       if (u_minify(resource->width0, level) == rtt_width &&
 427           u_minify(resource->height0, level) == rtt_height &&
 428           (resource->target != PIPE_TEXTURE_3D ||
 429            u_minify(resource->depth0, level) == rtt_depth)) {
 430          break;
 431       }
 432    }
 433    assert(level <= resource->last_level);
 434
 435    /* determine the layer bounds */
 436    unsigned first_layer, last_layer;
 437    if (strb->rtt_layered) {
 438       first_layer = 0;
 439       last_layer = util_max_layer(strb->texture, level);
 440    }
 441    else {
 442       first_layer =
 443       last_layer = strb->rtt_face + strb->rtt_slice;
 444    }
 445
 446    /* Adjust for texture views */
 447    if (strb->is_rtt && resource->array_size > 1 &&
 448        stTexObj->base.Immutable) {
 449       const struct gl_texture_object *tex = &stTexObj->base;
 450       first_layer += tex->MinLayer;
 451       if (!strb->rtt_layered)
 452          last_layer += tex->MinLayer;
 453       else
 454          last_layer = MIN2(first_layer + tex->NumLayers - 1, last_layer);
 455    }
 456
 457    struct pipe_surface **psurf =
 458       enable_srgb ? &strb->surface_srgb : &strb->surface_linear;
 459    struct pipe_surface *surf = *psurf;
 460
 461    if (!surf ||
 462        surf->texture->nr_samples != strb->Base.NumSamples ||
 463        surf->format != format ||
 464        surf->texture != resource ||
 465        surf->width != rtt_width ||
 466        surf->height != rtt_height ||
 467        surf->u.tex.level != level ||
 468        surf->u.tex.first_layer != first_layer ||
 469        surf->u.tex.last_layer != last_layer) {
 470       /* create a new pipe_surface */
 471       struct pipe_surface surf_tmpl;
 472       memset(&surf_tmpl, 0, sizeof(surf_tmpl));
 473       surf_tmpl.format = format;
 474       surf_tmpl.u.tex.level = level;
 475       surf_tmpl.u.tex.first_layer = first_layer;
 476       surf_tmpl.u.tex.last_layer = last_layer;
 477
 478       pipe_surface_release(pipe, psurf);
 479
 480       *psurf = pipe->create_surface(pipe, resource, &surf_tmpl);
 481    }
 482    strb->surface = *psurf;
 483 }
 484
 485
 486 /**
 487  * Return the pipe_resource which stores a particular texture image.
 488  */
 489 static struct pipe_resource *
 490 get_teximage_resource(struct gl_texture_object *texObj,
 491                       unsigned face, unsigned level)
 492 {
 493    struct st_texture_image *stImg =
 494       st_texture_image(texObj->Image[face][level]);
 495
 496    return stImg->pt;
 497 }
 498
 499
 500 /**
 501  * Called by ctx->Driver.RenderTexture
 502  */
 503 static void
 504 st_render_texture(struct gl_context *ctx,
 505                   struct gl_framebuffer *fb,
 506                   struct gl_renderbuffer_attachment *att)
 507 {
 508    struct st_context *st = st_context(ctx);
 509    struct pipe_context *pipe = st->pipe;
 510    struct gl_renderbuffer *rb = att->Renderbuffer;
 511    struct st_renderbuffer *strb = st_renderbuffer(rb);
 512    struct pipe_resource *pt;
 513
 514    if (!st_finalize_texture(ctx, pipe, att->Texture, att->CubeMapFace))
 515       return;
 516
 517    pt = get_teximage_resource(att->Texture,
 518                               att->CubeMapFace,
 519                               att->TextureLevel);
 520    assert(pt);
 521
 522    /* point renderbuffer at texobject */
 523    strb->is_rtt = TRUE;
 524    strb->rtt_face = att->CubeMapFace;
 525    strb->rtt_slice = att->Zoffset;
 526    strb->rtt_layered = att->Layered;
 527    pipe_resource_reference(&strb->texture, pt);
 528
 529    st_update_renderbuffer_surface(st, strb);
 530
 531    /* Invalidate buffer state so that the pipe's framebuffer state
 532     * gets updated.
 533     * That's where the new renderbuffer (which we just created) gets
 534     * passed to the pipe as a (color/depth) render target.
 535     */
 536    st_invalidate_buffers(st);
 537
 538
 539    /* Need to trigger a call to update_framebuffer() since we just
 540     * attached a new renderbuffer.
 541     */
 542    ctx->NewState |= _NEW_BUFFERS;
 543 }
 544
 545
 546 /**
 547  * Called via ctx->Driver.FinishRenderTexture.
 548  */
 549 static void
 550 st_finish_render_texture(struct gl_context *ctx, struct gl_renderbuffer *rb)
 551 {
 552    struct st_context *st = st_context(ctx);
 553    struct st_renderbuffer *strb = st_renderbuffer(rb);
 554
 555    if (!strb)
 556       return;
 557
 558    strb->is_rtt = FALSE;
 559
 560    /* restore previous framebuffer state */
 561    st_invalidate_buffers(st);
 562 }
 563
 564
 565 /** Debug helper */
 566 static void
 567 st_fbo_invalid(const char *reason)
 568 {
 569    if (MESA_DEBUG_FLAGS & DEBUG_INCOMPLETE_FBO) {
 570       _mesa_debug(NULL, "Invalid FBO: %s\n", reason);
 571    }
 572 }
 573
 574
 575 /**
 576  * Validate a renderbuffer attachment for a particular set of bindings.
 577  */
 578 static GLboolean
 579 st_validate_attachment(struct gl_context *ctx,
 580                        struct pipe_screen *screen,
 581                        const struct gl_renderbuffer_attachment *att,
 582                        unsigned bindings)
 583 {
 584    const struct st_texture_object *stObj = st_texture_object(att->Texture);
 585    enum pipe_format format;
 586    mesa_format texFormat;
 587    GLboolean valid;
 588
 589    /* Sanity check: we must be binding the surface as a (color) render target
 590     * or depth/stencil target.
 591     */
 592    assert(bindings == PIPE_BIND_RENDER_TARGET ||
 593           bindings == PIPE_BIND_DEPTH_STENCIL);
 594
 595    /* Only validate texture attachments for now, since
 596     * st_renderbuffer_alloc_storage makes sure that
 597     * the format is supported.
 598     */
 599    if (att->Type != GL_TEXTURE)
 600       return GL_TRUE;
 601
 602    if (!stObj || !stObj->pt)
 603       return GL_FALSE;
 604
 605    format = stObj->pt->format;
 606    texFormat = att->Renderbuffer->TexImage->TexFormat;
 607
 608    /* If the encoding is sRGB and sRGB rendering cannot be enabled,
 609     * check for linear format support instead.
 610     * Later when we create a surface, we change the format to a linear one. */
 611    if (!ctx->Extensions.EXT_framebuffer_sRGB &&
 612        _mesa_get_format_color_encoding(texFormat) == GL_SRGB) {
 613       const mesa_format linearFormat = _mesa_get_srgb_format_linear(texFormat);
 614       format = st_mesa_format_to_pipe_format(st_context(ctx), linearFormat);
 615    }
 616
 617    valid = screen->is_format_supported(screen, format,
 618                                       PIPE_TEXTURE_2D,
 619                                       stObj->pt->nr_samples, bindings);
 620    if (!valid) {
 621       st_fbo_invalid("Invalid format");
 622    }
 623
 624    return valid;
 625 }
 626
 627
 628 /**
 629  * Check that the framebuffer configuration is valid in terms of what
 630  * the driver can support.
 631  *
 632  * For Gallium we only supports combined Z+stencil, not separate buffers.
 633  */
 634 static void
 635 st_validate_framebuffer(struct gl_context *ctx, struct gl_framebuffer *fb)
 636 {
 637    struct st_context *st = st_context(ctx);
 638    struct pipe_screen *screen = st->pipe->screen;
 639    const struct gl_renderbuffer_attachment *depth =
 640          &fb->Attachment[BUFFER_DEPTH];
 641    const struct gl_renderbuffer_attachment *stencil =
 642          &fb->Attachment[BUFFER_STENCIL];
 643    GLuint i;
 644    enum pipe_format first_format = PIPE_FORMAT_NONE;
 645    boolean mixed_formats =
 646          screen->get_param(screen, PIPE_CAP_MIXED_COLORBUFFER_FORMATS) != 0;
 647
 648    if (depth->Type && stencil->Type && depth->Type != stencil->Type) {
 649       st_fbo_invalid("Different Depth/Stencil buffer formats");
 650       fb->_Status = GL_FRAMEBUFFER_UNSUPPORTED_EXT;
 651       return;
 652    }
 653    if (depth->Type == GL_RENDERBUFFER_EXT &&
 654        stencil->Type == GL_RENDERBUFFER_EXT &&
 655        depth->Renderbuffer != stencil->Renderbuffer) {
 656       st_fbo_invalid("Separate Depth/Stencil buffers");
 657       fb->_Status = GL_FRAMEBUFFER_UNSUPPORTED_EXT;
 658       return;
 659    }
 660    if (depth->Type == GL_TEXTURE &&
 661        stencil->Type == GL_TEXTURE &&
 662        depth->Texture != stencil->Texture) {
 663       fb->_Status = GL_FRAMEBUFFER_UNSUPPORTED_EXT;
 664       st_fbo_invalid("Different Depth/Stencil textures");
 665       return;
 666    }
 667
 668    if (!st_validate_attachment(ctx, screen, depth, PIPE_BIND_DEPTH_STENCIL)) {
 669       fb->_Status = GL_FRAMEBUFFER_UNSUPPORTED_EXT;
 670       st_fbo_invalid("Invalid depth attachment");
 671       return;
 672    }
 673    if (!st_validate_attachment(ctx, screen, stencil, PIPE_BIND_DEPTH_STENCIL)) {
 674       fb->_Status = GL_FRAMEBUFFER_UNSUPPORTED_EXT;
 675       st_fbo_invalid("Invalid stencil attachment");
 676       return;
 677    }
 678    for (i = 0; i < ctx->Const.MaxColorAttachments; i++) {
 679       struct gl_renderbuffer_attachment *att =
 680             &fb->Attachment[BUFFER_COLOR0 + i];
 681       enum pipe_format format;
 682
 683       if (!st_validate_attachment(ctx, screen, att, PIPE_BIND_RENDER_TARGET)) {
 684          fb->_Status = GL_FRAMEBUFFER_UNSUPPORTED_EXT;
 685          st_fbo_invalid("Invalid color attachment");
 686          return;
 687       }
 688
 689       if (!mixed_formats) {
 690          /* Disallow mixed formats. */
 691          if (att->Type != GL_NONE) {
 692             format = st_renderbuffer(att->Renderbuffer)->surface->format;
 693          } else {
 694             continue;
 695          }
 696
 697          if (first_format == PIPE_FORMAT_NONE) {
 698             first_format = format;
 699          } else if (format != first_format) {
 700             fb->_Status = GL_FRAMEBUFFER_UNSUPPORTED_EXT;
 701             st_fbo_invalid("Mixed color formats");
 702             return;
 703          }
 704       }
 705    }
 706 }
 707
 708
 709 /**
 710  * Called via glDrawBuffer.  We only provide this driver function so that we
 711  * can check if we need to allocate a new renderbuffer.  Specifically, we
 712  * don't usually allocate a front color buffer when using a double-buffered
 713  * visual.  But if the app calls glDrawBuffer(GL_FRONT) we need to allocate
 714  * that buffer.  Note, this is only for window system buffers, not user-
 715  * created FBOs.
 716  */
 717 static void
 718 st_DrawBuffers(struct gl_context *ctx, GLsizei count, const GLenum *buffers)
 719 {
 720    struct st_context *st = st_context(ctx);
 721    struct gl_framebuffer *fb = ctx->DrawBuffer;
 722
 723    (void) count;
 724    (void) buffers;
 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_DrawBuffers, we use this function
 742  * 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 {
 779    struct st_context *st = st_context(ctx);
 780    struct st_renderbuffer *strb = st_renderbuffer(rb);
 781    struct pipe_context *pipe = st->pipe;
 782    const GLboolean invert = rb->Name == 0;
 783    unsigned usage;
 784    GLuint y2;
 785    GLubyte *map;
 786
 787    if (strb->software) {
 788       /* software-allocated renderbuffer (probably an accum buffer) */
 789       if (strb->data) {
 790          GLint bpp = _mesa_get_format_bytes(strb->Base.Format);
 791          GLint stride = _mesa_format_row_stride(strb->Base.Format,
 792                                                 strb->Base.Width);
 793          *mapOut = (GLubyte *) strb->data + y * stride + x * bpp;
 794          *rowStrideOut = stride;
 795       }
 796       else {
 797          *mapOut = NULL;
 798          *rowStrideOut = 0;
 799       }
 800       return;
 801    }
 802
 803    usage = 0x0;
 804    if (mode & GL_MAP_READ_BIT)
 805       usage |= PIPE_TRANSFER_READ;
 806    if (mode & GL_MAP_WRITE_BIT)
 807       usage |= PIPE_TRANSFER_WRITE;
 808    if (mode & GL_MAP_INVALIDATE_RANGE_BIT)
 809       usage |= PIPE_TRANSFER_DISCARD_RANGE;
 810
 811    /* Note: y=0=bottom of buffer while y2=0=top of buffer.
 812     * 'invert' will be true for window-system buffers and false for
 813     * user-allocated renderbuffers and textures.
 814     */
 815    if (invert)
 816       y2 = strb->Base.Height - y - h;
 817    else
 818       y2 = y;
 819
 820     map = pipe_transfer_map(pipe,
 821                             strb->texture,
 822                             strb->surface->u.tex.level,
 823                             strb->surface->u.tex.first_layer,
 824                             usage, x, y2, w, h, &strb->transfer);
 825    if (map) {
 826       if (invert) {
 827          *rowStrideOut = -(int) strb->transfer->stride;
 828          map += (h - 1) * strb->transfer->stride;
 829       }
 830       else {
 831          *rowStrideOut = strb->transfer->stride;
 832       }
 833       *mapOut = map;
 834    }
 835    else {
 836       *mapOut = NULL;
 837       *rowStrideOut = 0;
 838    }
 839 }
 840
 841
 842 /**
 843  * Called via ctx->Driver.UnmapRenderbuffer.
 844  */
 845 static void
 846 st_UnmapRenderbuffer(struct gl_context *ctx,
 847                      struct gl_renderbuffer *rb)
 848 {
 849    struct st_context *st = st_context(ctx);
 850    struct st_renderbuffer *strb = st_renderbuffer(rb);
 851    struct pipe_context *pipe = st->pipe;
 852
 853    if (strb->software) {
 854       /* software-allocated renderbuffer (probably an accum buffer) */
 855       return;
 856    }
 857
 858    pipe_transfer_unmap(pipe, strb->transfer);
 859    strb->transfer = NULL;
 860 }
 861
 862
 863
 864 void
 865 st_init_fbo_functions(struct dd_function_table *functions)
 866 {
 867    functions->NewFramebuffer = _mesa_new_framebuffer;
 868    functions->NewRenderbuffer = st_new_renderbuffer;
 869    functions->FramebufferRenderbuffer = _mesa_FramebufferRenderbuffer_sw;
 870    functions->RenderTexture = st_render_texture;
 871    functions->FinishRenderTexture = st_finish_render_texture;
 872    functions->ValidateFramebuffer = st_validate_framebuffer;
 873
 874    functions->DrawBuffers = st_DrawBuffers;
 875    functions->ReadBuffer = st_ReadBuffer;
 876
 877    functions->MapRenderbuffer = st_MapRenderbuffer;
 878    functions->UnmapRenderbuffer = st_UnmapRenderbuffer;
 879 }