src/mesa/state_tracker/st_cb_fbo.c

   1 /**************************************************************************
   2  *
   3  * Copyright 2007 Tungsten Graphics, Inc., Cedar Park, Texas.
   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 TUNGSTEN GRAPHICS 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/macros.h"
  41 #include "main/mfeatures.h"
  42 #include "main/renderbuffer.h"
  43
  44 #include "pipe/p_context.h"
  45 #include "pipe/p_defines.h"
  46 #include "pipe/p_screen.h"
  47 #include "st_context.h"
  48 #include "st_cb_fbo.h"
  49 #include "st_cb_flush.h"
  50 #include "st_cb_texture.h"
  51 #include "st_format.h"
  52 #include "st_texture.h"
  53 #include "st_manager.h"
  54
  55 #include "util/u_format.h"
  56 #include "util/u_inlines.h"
  57 #include "util/u_surface.h"
  58
  59
  60 static GLboolean
  61 st_renderbuffer_alloc_sw_storage(struct gl_context * ctx,
  62                                  struct gl_renderbuffer *rb,
  63                                  GLenum internalFormat,
  64                                  GLuint width, GLuint height)
  65 {
  66    struct pipe_screen *screen = st_context(ctx)->pipe->screen;
  67    struct st_renderbuffer *strb = st_renderbuffer(rb);
  68    enum pipe_format format;
  69    size_t size;
  70
  71    free(strb->data);
  72    strb->data = NULL;
  73
  74    if (internalFormat == GL_RGBA16_SNORM) {
  75       /* Special case for software accum buffers.  Otherwise, if the
  76        * call to st_choose_renderbuffer_format() fails (because the
  77        * driver doesn't support signed 16-bit/channel colors) we'd
  78        * just return without allocating the software accum buffer.
  79        */
  80       format = PIPE_FORMAT_R16G16B16A16_SNORM;
  81    }
  82    else {
  83       format = st_choose_renderbuffer_format(screen, internalFormat, 0);
  84
  85       /* Not setting gl_renderbuffer::Format here will cause
  86        * FRAMEBUFFER_UNSUPPORTED and ValidateFramebuffer will not be called.
  87        */
  88       if (format == PIPE_FORMAT_NONE) {
  89          return GL_TRUE;
  90       }
  91    }
  92
  93    strb->Base.Format = st_pipe_format_to_mesa_format(format);
  94
  95    size = _mesa_format_image_size(strb->Base.Format, width, height, 1);
  96    strb->data = malloc(size);
  97    return strb->data != NULL;
  98 }
  99
 100
 101 /**
 102  * gl_renderbuffer::AllocStorage()
 103  * This is called to allocate the original drawing surface, and
 104  * during window resize.
 105  */
 106 static GLboolean
 107 st_renderbuffer_alloc_storage(struct gl_context * ctx,
 108                               struct gl_renderbuffer *rb,
 109                               GLenum internalFormat,
 110                               GLuint width, GLuint height)
 111 {
 112    struct st_context *st = st_context(ctx);
 113    struct pipe_context *pipe = st->pipe;
 114    struct pipe_screen *screen = st->pipe->screen;
 115    struct st_renderbuffer *strb = st_renderbuffer(rb);
 116    enum pipe_format format = PIPE_FORMAT_NONE;
 117    struct pipe_surface surf_tmpl;
 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, NULL );
 134    pipe_resource_reference( &strb->texture, NULL );
 135
 136    /* Handle multisample renderbuffers first.
 137     *
 138     * From ARB_framebuffer_object:
 139     *   If <samples> is zero, then RENDERBUFFER_SAMPLES is set to zero.
 140     *   Otherwise <samples> represents a request for a desired minimum
 141     *   number of samples. Since different implementations may support
 142     *   different sample counts for multisampled rendering, the actual
 143     *   number of samples allocated for the renderbuffer image is
 144     *   implementation dependent.  However, the resulting value for
 145     *   RENDERBUFFER_SAMPLES is guaranteed to be greater than or equal
 146     *   to <samples> and no more than the next larger sample count supported
 147     *   by the implementation.
 148     *
 149     * So let's find the supported number of samples closest to NumSamples.
 150     * (NumSamples == 1) is treated the same as (NumSamples == 0).
 151     */
 152    if (rb->NumSamples > 1) {
 153       unsigned i;
 154
 155       for (i = rb->NumSamples; i <= ctx->Const.MaxSamples; i++) {
 156          format = st_choose_renderbuffer_format(screen, internalFormat, i);
 157
 158          if (format != PIPE_FORMAT_NONE) {
 159             rb->NumSamples = i;
 160             break;
 161          }
 162       }
 163    } else {
 164       format = st_choose_renderbuffer_format(screen, internalFormat, 0);
 165    }
 166
 167    /* Not setting gl_renderbuffer::Format here will cause
 168     * FRAMEBUFFER_UNSUPPORTED and ValidateFramebuffer will not be called.
 169     */
 170    if (format == PIPE_FORMAT_NONE) {
 171       return GL_TRUE;
 172    }
 173
 174    strb->Base.Format = st_pipe_format_to_mesa_format(format);
 175
 176    if (width == 0 || height == 0) {
 177       /* if size is zero, nothing to allocate */
 178       return GL_TRUE;
 179    }
 180
 181    /* Setup new texture template.
 182     */
 183    memset(&templ, 0, sizeof(templ));
 184    templ.target = st->internal_target;
 185    templ.format = format;
 186    templ.width0 = width;
 187    templ.height0 = height;
 188    templ.depth0 = 1;
 189    templ.array_size = 1;
 190    templ.nr_samples = rb->NumSamples;
 191    if (util_format_is_depth_or_stencil(format)) {
 192       templ.bind = PIPE_BIND_DEPTH_STENCIL;
 193    }
 194    else if (strb->Base.Name != 0) {
 195       /* this is a user-created renderbuffer */
 196       templ.bind = PIPE_BIND_RENDER_TARGET;
 197    }
 198    else {
 199       /* this is a window-system buffer */
 200       templ.bind = (PIPE_BIND_DISPLAY_TARGET |
 201                     PIPE_BIND_RENDER_TARGET);
 202    }
 203
 204    strb->texture = screen->resource_create(screen, &templ);
 205
 206    if (!strb->texture)
 207       return FALSE;
 208
 209    u_surface_default_template(&surf_tmpl, strb->texture, templ.bind);
 210    strb->surface = pipe->create_surface(pipe,
 211                                         strb->texture,
 212                                         &surf_tmpl);
 213    if (strb->surface) {
 214       assert(strb->surface->texture);
 215       assert(strb->surface->format);
 216       assert(strb->surface->width == width);
 217       assert(strb->surface->height == height);
 218    }
 219
 220    return strb->surface != NULL;
 221 }
 222
 223
 224 /**
 225  * gl_renderbuffer::Delete()
 226  */
 227 static void
 228 st_renderbuffer_delete(struct gl_renderbuffer *rb)
 229 {
 230    struct st_renderbuffer *strb = st_renderbuffer(rb);
 231    ASSERT(strb);
 232    pipe_surface_reference(&strb->surface, NULL);
 233    pipe_resource_reference(&strb->texture, NULL);
 234    free(strb->data);
 235    free(strb);
 236 }
 237
 238
 239 /**
 240  * Called via ctx->Driver.NewFramebuffer()
 241  */
 242 static struct gl_framebuffer *
 243 st_new_framebuffer(struct gl_context *ctx, GLuint name)
 244 {
 245    /* XXX not sure we need to subclass gl_framebuffer for pipe */
 246    return _mesa_new_framebuffer(ctx, name);
 247 }
 248
 249
 250 /**
 251  * Called via ctx->Driver.NewRenderbuffer()
 252  */
 253 static struct gl_renderbuffer *
 254 st_new_renderbuffer(struct gl_context *ctx, GLuint name)
 255 {
 256    struct st_renderbuffer *strb = ST_CALLOC_STRUCT(st_renderbuffer);
 257    if (strb) {
 258       assert(name != 0);
 259       _mesa_init_renderbuffer(&strb->Base, name);
 260       strb->Base.Delete = st_renderbuffer_delete;
 261       strb->Base.AllocStorage = st_renderbuffer_alloc_storage;
 262       return &strb->Base;
 263    }
 264    return NULL;
 265 }
 266
 267
 268 /**
 269  * Allocate a renderbuffer for a an on-screen window (not a user-created
 270  * renderbuffer).  The window system code determines the format.
 271  */
 272 struct gl_renderbuffer *
 273 st_new_renderbuffer_fb(enum pipe_format format, int samples, boolean sw)
 274 {
 275    struct st_renderbuffer *strb;
 276
 277    strb = ST_CALLOC_STRUCT(st_renderbuffer);
 278    if (!strb) {
 279       _mesa_error(NULL, GL_OUT_OF_MEMORY, "creating renderbuffer");
 280       return NULL;
 281    }
 282
 283    _mesa_init_renderbuffer(&strb->Base, 0);
 284    strb->Base.ClassID = 0x4242; /* just a unique value */
 285    strb->Base.NumSamples = samples;
 286    strb->Base.Format = st_pipe_format_to_mesa_format(format);
 287    strb->Base._BaseFormat = _mesa_get_format_base_format(strb->Base.Format);
 288    strb->software = sw;
 289
 290    switch (format) {
 291    case PIPE_FORMAT_R8G8B8A8_UNORM:
 292    case PIPE_FORMAT_B8G8R8A8_UNORM:
 293    case PIPE_FORMAT_A8R8G8B8_UNORM:
 294       strb->Base.InternalFormat = GL_RGBA8;
 295       break;
 296    case PIPE_FORMAT_R8G8B8X8_UNORM:
 297    case PIPE_FORMAT_B8G8R8X8_UNORM:
 298    case PIPE_FORMAT_X8R8G8B8_UNORM:
 299       strb->Base.InternalFormat = GL_RGB8;
 300       break;
 301    case PIPE_FORMAT_B5G5R5A1_UNORM:
 302       strb->Base.InternalFormat = GL_RGB5_A1;
 303       break;
 304    case PIPE_FORMAT_B4G4R4A4_UNORM:
 305       strb->Base.InternalFormat = GL_RGBA4;
 306       break;
 307    case PIPE_FORMAT_B5G6R5_UNORM:
 308       strb->Base.InternalFormat = GL_RGB565;
 309       break;
 310    case PIPE_FORMAT_Z16_UNORM:
 311       strb->Base.InternalFormat = GL_DEPTH_COMPONENT16;
 312       break;
 313    case PIPE_FORMAT_Z32_UNORM:
 314       strb->Base.InternalFormat = GL_DEPTH_COMPONENT32;
 315       break;
 316    case PIPE_FORMAT_Z24_UNORM_S8_UINT:
 317    case PIPE_FORMAT_S8_UINT_Z24_UNORM:
 318    case PIPE_FORMAT_Z24X8_UNORM:
 319    case PIPE_FORMAT_X8Z24_UNORM:
 320       strb->Base.InternalFormat = GL_DEPTH24_STENCIL8_EXT;
 321       break;
 322    case PIPE_FORMAT_S8_UINT:
 323       strb->Base.InternalFormat = GL_STENCIL_INDEX8_EXT;
 324       break;
 325    case PIPE_FORMAT_R16G16B16A16_SNORM:
 326       /* accum buffer */
 327       strb->Base.InternalFormat = GL_RGBA16_SNORM;
 328       break;
 329    case PIPE_FORMAT_R8_UNORM:
 330       strb->Base.InternalFormat = GL_R8;
 331       break;
 332    case PIPE_FORMAT_R8G8_UNORM:
 333       strb->Base.InternalFormat = GL_RG8;
 334       break;
 335    case PIPE_FORMAT_R16_UNORM:
 336       strb->Base.InternalFormat = GL_R16;
 337       break;
 338    case PIPE_FORMAT_R16G16_UNORM:
 339       strb->Base.InternalFormat = GL_RG16;
 340       break;
 341    case PIPE_FORMAT_R32G32B32A32_FLOAT:
 342       strb->Base.InternalFormat = GL_RGBA32F;
 343       break;
 344    case PIPE_FORMAT_R16G16B16A16_FLOAT:
 345       strb->Base.InternalFormat = GL_RGBA16F;
 346       break;
 347    default:
 348       _mesa_problem(NULL,
 349                     "Unexpected format %s in st_new_renderbuffer_fb",
 350                     util_format_name(format));
 351       free(strb);
 352       return NULL;
 353    }
 354
 355    /* st-specific methods */
 356    strb->Base.Delete = st_renderbuffer_delete;
 357    strb->Base.AllocStorage = st_renderbuffer_alloc_storage;
 358
 359    /* surface is allocated in st_renderbuffer_alloc_storage() */
 360    strb->surface = NULL;
 361
 362    return &strb->Base;
 363 }
 364
 365
 366 /**
 367  * Called via ctx->Driver.BindFramebufferEXT().
 368  */
 369 static void
 370 st_bind_framebuffer(struct gl_context *ctx, GLenum target,
 371                     struct gl_framebuffer *fb, struct gl_framebuffer *fbread)
 372 {
 373    /* no-op */
 374 }
 375
 376
 377 /**
 378  * Called by ctx->Driver.RenderTexture
 379  */
 380 static void
 381 st_render_texture(struct gl_context *ctx,
 382                   struct gl_framebuffer *fb,
 383                   struct gl_renderbuffer_attachment *att)
 384 {
 385    struct st_context *st = st_context(ctx);
 386    struct pipe_context *pipe = st->pipe;
 387    struct st_renderbuffer *strb;
 388    struct gl_renderbuffer *rb;
 389    struct pipe_resource *pt;
 390    struct st_texture_object *stObj;
 391    const struct gl_texture_image *texImage;
 392    struct pipe_surface surf_tmpl;
 393
 394    if (!st_finalize_texture(ctx, pipe, att->Texture))
 395       return;
 396
 397    pt = st_get_texobj_resource(att->Texture);
 398    assert(pt);
 399
 400    /* get pointer to texture image we're rendeing to */
 401    texImage = _mesa_get_attachment_teximage(att);
 402
 403    /* create new renderbuffer which wraps the texture image.
 404     * Use the texture's name as the renderbuffer's name so that we have
 405     * something that's non-zero (to determine vertical orientation) and
 406     * possibly helpful for debugging.
 407     */
 408    rb = st_new_renderbuffer(ctx, att->Texture->Name);
 409    if (!rb) {
 410       _mesa_error(ctx, GL_OUT_OF_MEMORY, "glFramebufferTexture()");
 411       return;
 412    }
 413
 414    _mesa_reference_renderbuffer(&att->Renderbuffer, rb);
 415    assert(rb->RefCount == 1);
 416    rb->AllocStorage = NULL; /* should not get called */
 417    strb = st_renderbuffer(rb);
 418
 419    assert(strb->Base.RefCount > 0);
 420
 421    /* get the texture for the texture object */
 422    stObj = st_texture_object(att->Texture);
 423
 424    /* point renderbuffer at texobject */
 425    strb->rtt = stObj;
 426    strb->rtt_level = att->TextureLevel;
 427    strb->rtt_face = att->CubeMapFace;
 428    strb->rtt_slice = att->Zoffset;
 429
 430    rb->Width = texImage->Width2;
 431    rb->Height = texImage->Height2;
 432    rb->_BaseFormat = texImage->_BaseFormat;
 433    rb->InternalFormat = texImage->InternalFormat;
 434
 435    pipe_resource_reference( &strb->texture, pt );
 436
 437    pipe_surface_reference(&strb->surface, NULL);
 438
 439    assert(strb->rtt_level <= strb->texture->last_level);
 440
 441    /* new surface for rendering into the texture */
 442    memset(&surf_tmpl, 0, sizeof(surf_tmpl));
 443    surf_tmpl.format = ctx->Color.sRGBEnabled
 444       ? strb->texture->format : util_format_linear(strb->texture->format);
 445    surf_tmpl.usage = PIPE_BIND_RENDER_TARGET;
 446    surf_tmpl.u.tex.level = strb->rtt_level;
 447    surf_tmpl.u.tex.first_layer = strb->rtt_face + strb->rtt_slice;
 448    surf_tmpl.u.tex.last_layer = strb->rtt_face + strb->rtt_slice;
 449    strb->surface = pipe->create_surface(pipe,
 450                                         strb->texture,
 451                                         &surf_tmpl);
 452
 453    strb->Base.Format = st_pipe_format_to_mesa_format(pt->format);
 454
 455    /* Invalidate buffer state so that the pipe's framebuffer state
 456     * gets updated.
 457     * That's where the new renderbuffer (which we just created) gets
 458     * passed to the pipe as a (color/depth) render target.
 459     */
 460    st_invalidate_state(ctx, _NEW_BUFFERS);
 461 }
 462
 463
 464 /**
 465  * Called via ctx->Driver.FinishRenderTexture.
 466  */
 467 static void
 468 st_finish_render_texture(struct gl_context *ctx,
 469                          struct gl_renderbuffer_attachment *att)
 470 {
 471    struct st_renderbuffer *strb = st_renderbuffer(att->Renderbuffer);
 472
 473    if (!strb)
 474       return;
 475
 476    strb->rtt = NULL;
 477
 478    /* restore previous framebuffer state */
 479    st_invalidate_state(ctx, _NEW_BUFFERS);
 480 }
 481
 482
 483 /** Debug helper */
 484 static void
 485 st_fbo_invalid(const char *reason)
 486 {
 487    if (MESA_DEBUG_FLAGS & DEBUG_INCOMPLETE_FBO) {
 488       _mesa_debug(NULL, "Invalid FBO: %s\n", reason);
 489    }
 490 }
 491
 492
 493 /**
 494  * Validate a renderbuffer attachment for a particular set of bindings.
 495  */
 496 static GLboolean
 497 st_validate_attachment(struct gl_context *ctx,
 498                        struct pipe_screen *screen,
 499                        const struct gl_renderbuffer_attachment *att,
 500                        unsigned bindings)
 501 {
 502    const struct st_texture_object *stObj = st_texture_object(att->Texture);
 503    enum pipe_format format;
 504    gl_format texFormat;
 505    GLboolean valid;
 506
 507    /* Only validate texture attachments for now, since
 508     * st_renderbuffer_alloc_storage makes sure that
 509     * the format is supported.
 510     */
 511    if (att->Type != GL_TEXTURE)
 512       return GL_TRUE;
 513
 514    if (!stObj)
 515       return GL_FALSE;
 516
 517    format = stObj->pt->format;
 518    texFormat = _mesa_get_attachment_teximage_const(att)->TexFormat;
 519
 520    /* If the encoding is sRGB and sRGB rendering cannot be enabled,
 521     * check for linear format support instead.
 522     * Later when we create a surface, we change the format to a linear one. */
 523    if (!ctx->Extensions.EXT_framebuffer_sRGB &&
 524        _mesa_get_format_color_encoding(texFormat) == GL_SRGB) {
 525       const gl_format linearFormat = _mesa_get_srgb_format_linear(texFormat);
 526       format = st_mesa_format_to_pipe_format(linearFormat);
 527    }
 528
 529    valid = screen->is_format_supported(screen, format,
 530                                       PIPE_TEXTURE_2D,
 531                                       stObj->pt->nr_samples, bindings);
 532    if (!valid) {
 533       st_fbo_invalid("Invalid format");
 534    }
 535
 536    return valid;
 537 }
 538
 539
 540 /**
 541  * Check if two renderbuffer attachments name a combined depth/stencil
 542  * renderbuffer.
 543  */
 544 GLboolean
 545 st_is_depth_stencil_combined(const struct gl_renderbuffer_attachment *depth,
 546                              const struct gl_renderbuffer_attachment *stencil)
 547 {
 548    assert(depth && stencil);
 549
 550    if (depth->Type == stencil->Type) {
 551       if (depth->Type == GL_RENDERBUFFER_EXT &&
 552           depth->Renderbuffer == stencil->Renderbuffer)
 553          return GL_TRUE;
 554
 555       if (depth->Type == GL_TEXTURE &&
 556           depth->Texture == stencil->Texture)
 557          return GL_TRUE;
 558    }
 559
 560    return GL_FALSE;
 561 }
 562
 563
 564 /**
 565  * Check that the framebuffer configuration is valid in terms of what
 566  * the driver can support.
 567  *
 568  * For Gallium we only supports combined Z+stencil, not separate buffers.
 569  */
 570 static void
 571 st_validate_framebuffer(struct gl_context *ctx, struct gl_framebuffer *fb)
 572 {
 573    struct st_context *st = st_context(ctx);
 574    struct pipe_screen *screen = st->pipe->screen;
 575    const struct gl_renderbuffer_attachment *depth =
 576          &fb->Attachment[BUFFER_DEPTH];
 577    const struct gl_renderbuffer_attachment *stencil =
 578          &fb->Attachment[BUFFER_STENCIL];
 579    GLuint i;
 580    enum pipe_format first_format = PIPE_FORMAT_NONE;
 581    boolean mixed_formats =
 582          screen->get_param(screen, PIPE_CAP_MIXED_COLORBUFFER_FORMATS) != 0;
 583
 584    if (depth->Type && stencil->Type && depth->Type != stencil->Type) {
 585       st_fbo_invalid("Different Depth/Stencil buffer formats");
 586       fb->_Status = GL_FRAMEBUFFER_UNSUPPORTED_EXT;
 587       return;
 588    }
 589    if (depth->Type == GL_RENDERBUFFER_EXT &&
 590        stencil->Type == GL_RENDERBUFFER_EXT &&
 591        depth->Renderbuffer != stencil->Renderbuffer) {
 592       st_fbo_invalid("Separate Depth/Stencil buffers");
 593       fb->_Status = GL_FRAMEBUFFER_UNSUPPORTED_EXT;
 594       return;
 595    }
 596    if (depth->Type == GL_TEXTURE &&
 597        stencil->Type == GL_TEXTURE &&
 598        depth->Texture != stencil->Texture) {
 599       fb->_Status = GL_FRAMEBUFFER_UNSUPPORTED_EXT;
 600       st_fbo_invalid("Different Depth/Stencil textures");
 601       return;
 602    }
 603
 604    if (!st_validate_attachment(ctx,
 605                                screen,
 606                                depth,
 607                                PIPE_BIND_DEPTH_STENCIL)) {
 608       fb->_Status = GL_FRAMEBUFFER_UNSUPPORTED_EXT;
 609       return;
 610    }
 611    if (!st_validate_attachment(ctx,
 612                                screen,
 613                                stencil,
 614                                PIPE_BIND_DEPTH_STENCIL)) {
 615       fb->_Status = GL_FRAMEBUFFER_UNSUPPORTED_EXT;
 616       return;
 617    }
 618    for (i = 0; i < ctx->Const.MaxColorAttachments; i++) {
 619       struct gl_renderbuffer_attachment *att =
 620             &fb->Attachment[BUFFER_COLOR0 + i];
 621       enum pipe_format format;
 622
 623       if (!st_validate_attachment(ctx,
 624                                   screen,
 625                                   att,
 626                                   PIPE_BIND_RENDER_TARGET)) {
 627          fb->_Status = GL_FRAMEBUFFER_UNSUPPORTED_EXT;
 628          return;
 629       }
 630
 631       if (!mixed_formats) {
 632          /* Disallow mixed formats. */
 633          if (att->Type != GL_NONE) {
 634             format = st_renderbuffer(att->Renderbuffer)->surface->format;
 635          } else {
 636             continue;
 637          }
 638
 639          if (first_format == PIPE_FORMAT_NONE) {
 640             first_format = format;
 641          } else if (format != first_format) {
 642             fb->_Status = GL_FRAMEBUFFER_UNSUPPORTED_EXT;
 643             st_fbo_invalid("Mixed color formats");
 644             return;
 645          }
 646       }
 647    }
 648 }
 649
 650
 651 /**
 652  * Called via glDrawBuffer.
 653  */
 654 static void
 655 st_DrawBuffers(struct gl_context *ctx, GLsizei count, const GLenum *buffers)
 656 {
 657    struct st_context *st = st_context(ctx);
 658    struct gl_framebuffer *fb = ctx->DrawBuffer;
 659    GLuint i;
 660
 661    (void) count;
 662    (void) buffers;
 663
 664    /* add the renderbuffers on demand */
 665    for (i = 0; i < fb->_NumColorDrawBuffers; i++) {
 666       gl_buffer_index idx = fb->_ColorDrawBufferIndexes[i];
 667       st_manager_add_color_renderbuffer(st, fb, idx);
 668    }
 669 }
 670
 671
 672 /**
 673  * Called via glReadBuffer.
 674  */
 675 static void
 676 st_ReadBuffer(struct gl_context *ctx, GLenum buffer)
 677 {
 678    struct st_context *st = st_context(ctx);
 679    struct gl_framebuffer *fb = ctx->ReadBuffer;
 680
 681    (void) buffer;
 682
 683    /* add the renderbuffer on demand */
 684    st_manager_add_color_renderbuffer(st, fb, fb->_ColorReadBufferIndex);
 685 }
 686
 687
 688
 689 /**
 690  * Called via ctx->Driver.MapRenderbuffer.
 691  */
 692 static void
 693 st_MapRenderbuffer(struct gl_context *ctx,
 694                    struct gl_renderbuffer *rb,
 695                    GLuint x, GLuint y, GLuint w, GLuint h,
 696                    GLbitfield mode,
 697                    GLubyte **mapOut, GLint *rowStrideOut)
 698 {
 699    struct st_context *st = st_context(ctx);
 700    struct st_renderbuffer *strb = st_renderbuffer(rb);
 701    struct pipe_context *pipe = st->pipe;
 702    const GLboolean invert = rb->Name == 0;
 703    unsigned usage;
 704    GLuint y2;
 705
 706    if (strb->software) {
 707       /* software-allocated renderbuffer (probably an accum buffer) */
 708       if (strb->data) {
 709          GLint bpp = _mesa_get_format_bytes(strb->Base.Format);
 710          GLint stride = _mesa_format_row_stride(strb->Base.Format,
 711                                                 strb->Base.Width);
 712          *mapOut = (GLubyte *) strb->data + y * stride + x * bpp;
 713          *rowStrideOut = stride;
 714       }
 715       else {
 716          *mapOut = NULL;
 717          *rowStrideOut = 0;
 718       }
 719       return;
 720    }
 721
 722    usage = 0x0;
 723    if (mode & GL_MAP_READ_BIT)
 724       usage |= PIPE_TRANSFER_READ;
 725    if (mode & GL_MAP_WRITE_BIT)
 726       usage |= PIPE_TRANSFER_WRITE;
 727    if (mode & GL_MAP_INVALIDATE_RANGE_BIT)
 728       usage |= PIPE_TRANSFER_DISCARD_RANGE;
 729
 730    /* Note: y=0=bottom of buffer while y2=0=top of buffer.
 731     * 'invert' will be true for window-system buffers and false for
 732     * user-allocated renderbuffers and textures.
 733     */
 734    if (invert)
 735       y2 = strb->Base.Height - y - h;
 736    else
 737       y2 = y;
 738
 739    strb->transfer = pipe_get_transfer(pipe,
 740                                       strb->texture,
 741                                       strb->rtt_level,
 742                                       strb->rtt_face + strb->rtt_slice,
 743                                       usage, x, y2, w, h);
 744    if (strb->transfer) {
 745       GLubyte *map = pipe_transfer_map(pipe, strb->transfer);
 746       if (invert) {
 747          *rowStrideOut = -strb->transfer->stride;
 748          map += (h - 1) * strb->transfer->stride;
 749       }
 750       else {
 751          *rowStrideOut = strb->transfer->stride;
 752       }
 753       *mapOut = map;
 754    }
 755    else {
 756       *mapOut = NULL;
 757       *rowStrideOut = 0;
 758    }
 759 }
 760
 761
 762 /**
 763  * Called via ctx->Driver.UnmapRenderbuffer.
 764  */
 765 static void
 766 st_UnmapRenderbuffer(struct gl_context *ctx,
 767                      struct gl_renderbuffer *rb)
 768 {
 769    struct st_context *st = st_context(ctx);
 770    struct st_renderbuffer *strb = st_renderbuffer(rb);
 771    struct pipe_context *pipe = st->pipe;
 772
 773    if (strb->software) {
 774       /* software-allocated renderbuffer (probably an accum buffer) */
 775       return;
 776    }
 777
 778    pipe_transfer_unmap(pipe, strb->transfer);
 779    pipe->transfer_destroy(pipe, strb->transfer);
 780    strb->transfer = NULL;
 781 }
 782
 783
 784
 785 void st_init_fbo_functions(struct dd_function_table *functions)
 786 {
 787 #if FEATURE_EXT_framebuffer_object
 788    functions->NewFramebuffer = st_new_framebuffer;
 789    functions->NewRenderbuffer = st_new_renderbuffer;
 790    functions->BindFramebuffer = st_bind_framebuffer;
 791    functions->FramebufferRenderbuffer = _mesa_framebuffer_renderbuffer;
 792    functions->RenderTexture = st_render_texture;
 793    functions->FinishRenderTexture = st_finish_render_texture;
 794    functions->ValidateFramebuffer = st_validate_framebuffer;
 795 #endif
 796
 797    functions->DrawBuffers = st_DrawBuffers;
 798    functions->ReadBuffer = st_ReadBuffer;
 799
 800    functions->MapRenderbuffer = st_MapRenderbuffer;
 801    functions->UnmapRenderbuffer = st_UnmapRenderbuffer;
 802 }
 803
 804