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/renderbuffer.h"
  42
  43 #include "pipe/p_context.h"
  44 #include "pipe/p_defines.h"
  45 #include "pipe/p_screen.h"
  46 #include "st_context.h"
  47 #include "st_cb_fbo.h"
  48 #include "st_cb_flush.h"
  49 #include "st_cb_texture.h"
  50 #include "st_format.h"
  51 #include "st_texture.h"
  52 #include "st_manager.h"
  53
  54 #include "util/u_format.h"
  55 #include "util/u_inlines.h"
  56 #include "util/u_surface.h"
  57
  58
  59 static GLboolean
  60 st_renderbuffer_alloc_sw_storage(struct gl_context * ctx,
  61                                  struct gl_renderbuffer *rb,
  62                                  GLenum internalFormat,
  63                                  GLuint width, GLuint height)
  64 {
  65    struct st_context *st = st_context(ctx);
  66    struct st_renderbuffer *strb = st_renderbuffer(rb);
  67    enum pipe_format format;
  68    size_t size;
  69
  70    free(strb->data);
  71    strb->data = NULL;
  72
  73    if (internalFormat == GL_RGBA16_SNORM) {
  74       /* Special case for software accum buffers.  Otherwise, if the
  75        * call to st_choose_renderbuffer_format() fails (because the
  76        * driver doesn't support signed 16-bit/channel colors) we'd
  77        * just return without allocating the software accum buffer.
  78        */
  79       format = PIPE_FORMAT_R16G16B16A16_SNORM;
  80    }
  81    else {
  82       format = st_choose_renderbuffer_format(st, internalFormat, 0);
  83
  84       /* Not setting gl_renderbuffer::Format here will cause
  85        * FRAMEBUFFER_UNSUPPORTED and ValidateFramebuffer will not be called.
  86        */
  87       if (format == PIPE_FORMAT_NONE) {
  88          return GL_TRUE;
  89       }
  90    }
  91
  92    strb->Base.Format = st_pipe_format_to_mesa_format(format);
  93
  94    size = _mesa_format_image_size(strb->Base.Format, width, height, 1);
  95    strb->data = malloc(size);
  96    return strb->data != NULL;
  97 }
  98
  99
 100 /**
 101  * gl_renderbuffer::AllocStorage()
 102  * This is called to allocate the original drawing surface, and
 103  * during window resize.
 104  */
 105 static GLboolean
 106 st_renderbuffer_alloc_storage(struct gl_context * ctx,
 107                               struct gl_renderbuffer *rb,
 108                               GLenum internalFormat,
 109                               GLuint width, GLuint height)
 110 {
 111    struct st_context *st = st_context(ctx);
 112    struct pipe_context *pipe = st->pipe;
 113    struct pipe_screen *screen = st->pipe->screen;
 114    struct st_renderbuffer *strb = st_renderbuffer(rb);
 115    enum pipe_format format = PIPE_FORMAT_NONE;
 116    struct pipe_surface surf_tmpl;
 117    struct pipe_resource templ;
 118
 119    /* init renderbuffer fields */
 120    strb->Base.Width  = width;
 121    strb->Base.Height = height;
 122    strb->Base._BaseFormat = _mesa_base_fbo_format(ctx, internalFormat);
 123    strb->defined = GL_FALSE;  /* undefined contents now */
 124
 125    if (strb->software) {
 126       return st_renderbuffer_alloc_sw_storage(ctx, rb, internalFormat,
 127                                               width, height);
 128    }
 129
 130    /* Free the old surface and texture
 131     */
 132    pipe_surface_reference( &strb->surface, NULL );
 133    pipe_resource_reference( &strb->texture, NULL );
 134
 135    /* Handle multisample renderbuffers first.
 136     *
 137     * From ARB_framebuffer_object:
 138     *   If <samples> is zero, then RENDERBUFFER_SAMPLES is set to zero.
 139     *   Otherwise <samples> represents a request for a desired minimum
 140     *   number of samples. Since different implementations may support
 141     *   different sample counts for multisampled rendering, the actual
 142     *   number of samples allocated for the renderbuffer image is
 143     *   implementation dependent.  However, the resulting value for
 144     *   RENDERBUFFER_SAMPLES is guaranteed to be greater than or equal
 145     *   to <samples> and no more than the next larger sample count supported
 146     *   by the implementation.
 147     *
 148     * So let's find the supported number of samples closest to NumSamples.
 149     * (NumSamples == 1) is treated the same as (NumSamples == 0).
 150     */
 151    if (rb->NumSamples > 1) {
 152       unsigned i;
 153
 154       for (i = rb->NumSamples; i <= ctx->Const.MaxSamples; i++) {
 155          format = st_choose_renderbuffer_format(st, internalFormat, i);
 156
 157          if (format != PIPE_FORMAT_NONE) {
 158             rb->NumSamples = i;
 159             break;
 160          }
 161       }
 162    } else {
 163       format = st_choose_renderbuffer_format(st, internalFormat, 0);
 164    }
 165
 166    /* Not setting gl_renderbuffer::Format here will cause
 167     * FRAMEBUFFER_UNSUPPORTED and ValidateFramebuffer will not be called.
 168     */
 169    if (format == PIPE_FORMAT_NONE) {
 170       return GL_TRUE;
 171    }
 172
 173    strb->Base.Format = st_pipe_format_to_mesa_format(format);
 174
 175    if (width == 0 || height == 0) {
 176       /* if size is zero, nothing to allocate */
 177       return GL_TRUE;
 178    }
 179
 180    /* Setup new texture template.
 181     */
 182    memset(&templ, 0, sizeof(templ));
 183    templ.target = st->internal_target;
 184    templ.format = format;
 185    templ.width0 = width;
 186    templ.height0 = height;
 187    templ.depth0 = 1;
 188    templ.array_size = 1;
 189    templ.nr_samples = rb->NumSamples;
 190    if (util_format_is_depth_or_stencil(format)) {
 191       templ.bind = PIPE_BIND_DEPTH_STENCIL;
 192    }
 193    else if (strb->Base.Name != 0) {
 194       /* this is a user-created renderbuffer */
 195       templ.bind = PIPE_BIND_RENDER_TARGET;
 196    }
 197    else {
 198       /* this is a window-system buffer */
 199       templ.bind = (PIPE_BIND_DISPLAY_TARGET |
 200                     PIPE_BIND_RENDER_TARGET);
 201    }
 202
 203    strb->texture = screen->resource_create(screen, &templ);
 204
 205    if (!strb->texture)
 206       return FALSE;
 207
 208    u_surface_default_template(&surf_tmpl, strb->texture);
 209    strb->surface = pipe->create_surface(pipe,
 210                                         strb->texture,
 211                                         &surf_tmpl);
 212    if (strb->surface) {
 213       assert(strb->surface->texture);
 214       assert(strb->surface->format);
 215       assert(strb->surface->width == width);
 216       assert(strb->surface->height == height);
 217    }
 218
 219    return strb->surface != NULL;
 220 }
 221
 222
 223 /**
 224  * gl_renderbuffer::Delete()
 225  */
 226 static void
 227 st_renderbuffer_delete(struct gl_context *ctx, struct gl_renderbuffer *rb)
 228 {
 229    struct st_renderbuffer *strb = st_renderbuffer(rb);
 230    if (ctx) {
 231       struct st_context *st = st_context(ctx);
 232       pipe_surface_release(st->pipe, &strb->surface);
 233    }
 234    pipe_resource_reference(&strb->texture, NULL);
 235    free(strb->data);
 236    _mesa_delete_renderbuffer(ctx, rb);
 237 }
 238
 239
 240 /**
 241  * Called via ctx->Driver.NewFramebuffer()
 242  */
 243 static struct gl_framebuffer *
 244 st_new_framebuffer(struct gl_context *ctx, GLuint name)
 245 {
 246    /* XXX not sure we need to subclass gl_framebuffer for pipe */
 247    return _mesa_new_framebuffer(ctx, name);
 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 a 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, int 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_R8G8B8A8_UNORM:
 293    case PIPE_FORMAT_B8G8R8A8_UNORM:
 294    case PIPE_FORMAT_A8R8G8B8_UNORM:
 295       strb->Base.InternalFormat = GL_RGBA8;
 296       break;
 297    case PIPE_FORMAT_R8G8B8X8_UNORM:
 298    case PIPE_FORMAT_B8G8R8X8_UNORM:
 299    case PIPE_FORMAT_X8R8G8B8_UNORM:
 300       strb->Base.InternalFormat = GL_RGB8;
 301       break;
 302    case PIPE_FORMAT_B5G5R5A1_UNORM:
 303       strb->Base.InternalFormat = GL_RGB5_A1;
 304       break;
 305    case PIPE_FORMAT_B4G4R4A4_UNORM:
 306       strb->Base.InternalFormat = GL_RGBA4;
 307       break;
 308    case PIPE_FORMAT_B5G6R5_UNORM:
 309       strb->Base.InternalFormat = GL_RGB565;
 310       break;
 311    case PIPE_FORMAT_Z16_UNORM:
 312       strb->Base.InternalFormat = GL_DEPTH_COMPONENT16;
 313       break;
 314    case PIPE_FORMAT_Z32_UNORM:
 315       strb->Base.InternalFormat = GL_DEPTH_COMPONENT32;
 316       break;
 317    case PIPE_FORMAT_Z24_UNORM_S8_UINT:
 318    case PIPE_FORMAT_S8_UINT_Z24_UNORM:
 319       strb->Base.InternalFormat = GL_DEPTH24_STENCIL8_EXT;
 320       break;
 321    case PIPE_FORMAT_Z24X8_UNORM:
 322    case PIPE_FORMAT_X8Z24_UNORM:
 323       strb->Base.InternalFormat = GL_DEPTH_COMPONENT24;
 324       break;
 325    case PIPE_FORMAT_S8_UINT:
 326       strb->Base.InternalFormat = GL_STENCIL_INDEX8_EXT;
 327       break;
 328    case PIPE_FORMAT_R16G16B16A16_SNORM:
 329       /* accum buffer */
 330       strb->Base.InternalFormat = GL_RGBA16_SNORM;
 331       break;
 332    case PIPE_FORMAT_R16G16B16A16_UNORM:
 333       strb->Base.InternalFormat = GL_RGBA16;
 334       break;
 335    case PIPE_FORMAT_R8_UNORM:
 336       strb->Base.InternalFormat = GL_R8;
 337       break;
 338    case PIPE_FORMAT_R8G8_UNORM:
 339       strb->Base.InternalFormat = GL_RG8;
 340       break;
 341    case PIPE_FORMAT_R16_UNORM:
 342       strb->Base.InternalFormat = GL_R16;
 343       break;
 344    case PIPE_FORMAT_R16G16_UNORM:
 345       strb->Base.InternalFormat = GL_RG16;
 346       break;
 347    case PIPE_FORMAT_R32G32B32A32_FLOAT:
 348       strb->Base.InternalFormat = GL_RGBA32F;
 349       break;
 350    case PIPE_FORMAT_R16G16B16A16_FLOAT:
 351       strb->Base.InternalFormat = GL_RGBA16F;
 352       break;
 353    default:
 354       _mesa_problem(NULL,
 355                     "Unexpected format %s in st_new_renderbuffer_fb",
 356                     util_format_name(format));
 357       free(strb);
 358       return NULL;
 359    }
 360
 361    /* st-specific methods */
 362    strb->Base.Delete = st_renderbuffer_delete;
 363    strb->Base.AllocStorage = st_renderbuffer_alloc_storage;
 364
 365    /* surface is allocated in st_renderbuffer_alloc_storage() */
 366    strb->surface = NULL;
 367
 368    return &strb->Base;
 369 }
 370
 371
 372 /**
 373  * Called via ctx->Driver.BindFramebufferEXT().
 374  */
 375 static void
 376 st_bind_framebuffer(struct gl_context *ctx, GLenum target,
 377                     struct gl_framebuffer *fb, struct gl_framebuffer *fbread)
 378 {
 379    /* no-op */
 380 }
 381
 382
 383 /**
 384  * Called by ctx->Driver.RenderTexture
 385  */
 386 static void
 387 st_render_texture(struct gl_context *ctx,
 388                   struct gl_framebuffer *fb,
 389                   struct gl_renderbuffer_attachment *att)
 390 {
 391    struct st_context *st = st_context(ctx);
 392    struct pipe_context *pipe = st->pipe;
 393    struct st_renderbuffer *strb;
 394    struct gl_renderbuffer *rb;
 395    struct pipe_resource *pt;
 396    struct st_texture_object *stObj;
 397    const struct gl_texture_image *texImage;
 398    struct pipe_surface surf_tmpl;
 399
 400    if (!st_finalize_texture(ctx, pipe, att->Texture))
 401       return;
 402
 403    pt = st_get_texobj_resource(att->Texture);
 404    assert(pt);
 405
 406    /* get pointer to texture image we're rendeing to */
 407    texImage = _mesa_get_attachment_teximage(att);
 408
 409    /* create new renderbuffer which wraps the texture image.
 410     * Use the texture's name as the renderbuffer's name so that we have
 411     * something that's non-zero (to determine vertical orientation) and
 412     * possibly helpful for debugging.
 413     */
 414    rb = st_new_renderbuffer(ctx, att->Texture->Name);
 415    if (!rb) {
 416       _mesa_error(ctx, GL_OUT_OF_MEMORY, "glFramebufferTexture()");
 417       return;
 418    }
 419
 420    _mesa_reference_renderbuffer(&att->Renderbuffer, rb);
 421    assert(rb->RefCount == 1);
 422    rb->AllocStorage = NULL; /* should not get called */
 423    strb = st_renderbuffer(rb);
 424
 425    assert(strb->Base.RefCount > 0);
 426
 427    /* get the texture for the texture object */
 428    stObj = st_texture_object(att->Texture);
 429
 430    /* point renderbuffer at texobject */
 431    strb->rtt = stObj;
 432    strb->rtt_level = att->TextureLevel;
 433    strb->rtt_face = att->CubeMapFace;
 434    strb->rtt_slice = att->Zoffset;
 435    rb->NumSamples = texImage->NumSamples;
 436    rb->Width = texImage->Width2;
 437    rb->Height = texImage->Height2;
 438    rb->_BaseFormat = texImage->_BaseFormat;
 439    rb->InternalFormat = texImage->InternalFormat;
 440
 441    pipe_resource_reference( &strb->texture, pt );
 442
 443    pipe_surface_release(pipe, &strb->surface);
 444
 445    assert(strb->rtt_level <= strb->texture->last_level);
 446
 447    /* new surface for rendering into the texture */
 448    memset(&surf_tmpl, 0, sizeof(surf_tmpl));
 449    surf_tmpl.format = ctx->Color.sRGBEnabled
 450       ? strb->texture->format : util_format_linear(strb->texture->format);
 451    surf_tmpl.u.tex.level = strb->rtt_level;
 452    surf_tmpl.u.tex.first_layer = strb->rtt_face + strb->rtt_slice;
 453    surf_tmpl.u.tex.last_layer = strb->rtt_face + strb->rtt_slice;
 454    strb->surface = pipe->create_surface(pipe,
 455                                         strb->texture,
 456                                         &surf_tmpl);
 457
 458    strb->Base.Format = st_pipe_format_to_mesa_format(pt->format);
 459
 460    /* Invalidate buffer state so that the pipe's framebuffer state
 461     * gets updated.
 462     * That's where the new renderbuffer (which we just created) gets
 463     * passed to the pipe as a (color/depth) render target.
 464     */
 465    st_invalidate_state(ctx, _NEW_BUFFERS);
 466
 467
 468    /* Need to trigger a call to update_framebuffer() since we just
 469     * attached a new renderbuffer.
 470     */
 471    ctx->NewState |= _NEW_BUFFERS;
 472 }
 473
 474
 475 /**
 476  * Called via ctx->Driver.FinishRenderTexture.
 477  */
 478 static void
 479 st_finish_render_texture(struct gl_context *ctx,
 480                          struct gl_renderbuffer_attachment *att)
 481 {
 482    struct st_renderbuffer *strb = st_renderbuffer(att->Renderbuffer);
 483
 484    if (!strb)
 485       return;
 486
 487    strb->rtt = NULL;
 488
 489    /* restore previous framebuffer state */
 490    st_invalidate_state(ctx, _NEW_BUFFERS);
 491 }
 492
 493
 494 /** Debug helper */
 495 static void
 496 st_fbo_invalid(const char *reason)
 497 {
 498    if (MESA_DEBUG_FLAGS & DEBUG_INCOMPLETE_FBO) {
 499       _mesa_debug(NULL, "Invalid FBO: %s\n", reason);
 500    }
 501 }
 502
 503
 504 /**
 505  * Validate a renderbuffer attachment for a particular set of bindings.
 506  */
 507 static GLboolean
 508 st_validate_attachment(struct gl_context *ctx,
 509                        struct pipe_screen *screen,
 510                        const struct gl_renderbuffer_attachment *att,
 511                        unsigned bindings)
 512 {
 513    const struct st_texture_object *stObj = st_texture_object(att->Texture);
 514    enum pipe_format format;
 515    gl_format texFormat;
 516    GLboolean valid;
 517
 518    /* Only validate texture attachments for now, since
 519     * st_renderbuffer_alloc_storage makes sure that
 520     * the format is supported.
 521     */
 522    if (att->Type != GL_TEXTURE)
 523       return GL_TRUE;
 524
 525    if (!stObj)
 526       return GL_FALSE;
 527
 528    format = stObj->pt->format;
 529    texFormat = _mesa_get_attachment_teximage_const(att)->TexFormat;
 530
 531    /* If the encoding is sRGB and sRGB rendering cannot be enabled,
 532     * check for linear format support instead.
 533     * Later when we create a surface, we change the format to a linear one. */
 534    if (!ctx->Extensions.EXT_framebuffer_sRGB &&
 535        _mesa_get_format_color_encoding(texFormat) == GL_SRGB) {
 536       const gl_format linearFormat = _mesa_get_srgb_format_linear(texFormat);
 537       format = st_mesa_format_to_pipe_format(linearFormat);
 538    }
 539
 540    valid = screen->is_format_supported(screen, format,
 541                                       PIPE_TEXTURE_2D,
 542                                       stObj->pt->nr_samples, bindings);
 543    if (!valid) {
 544       st_fbo_invalid("Invalid format");
 545    }
 546
 547    return valid;
 548 }
 549
 550
 551 /**
 552  * Check that the framebuffer configuration is valid in terms of what
 553  * the driver can support.
 554  *
 555  * For Gallium we only supports combined Z+stencil, not separate buffers.
 556  */
 557 static void
 558 st_validate_framebuffer(struct gl_context *ctx, struct gl_framebuffer *fb)
 559 {
 560    struct st_context *st = st_context(ctx);
 561    struct pipe_screen *screen = st->pipe->screen;
 562    const struct gl_renderbuffer_attachment *depth =
 563          &fb->Attachment[BUFFER_DEPTH];
 564    const struct gl_renderbuffer_attachment *stencil =
 565          &fb->Attachment[BUFFER_STENCIL];
 566    GLuint i;
 567    enum pipe_format first_format = PIPE_FORMAT_NONE;
 568    boolean mixed_formats =
 569          screen->get_param(screen, PIPE_CAP_MIXED_COLORBUFFER_FORMATS) != 0;
 570
 571    if (depth->Type && stencil->Type && depth->Type != stencil->Type) {
 572       st_fbo_invalid("Different Depth/Stencil buffer formats");
 573       fb->_Status = GL_FRAMEBUFFER_UNSUPPORTED_EXT;
 574       return;
 575    }
 576    if (depth->Type == GL_RENDERBUFFER_EXT &&
 577        stencil->Type == GL_RENDERBUFFER_EXT &&
 578        depth->Renderbuffer != stencil->Renderbuffer) {
 579       st_fbo_invalid("Separate Depth/Stencil buffers");
 580       fb->_Status = GL_FRAMEBUFFER_UNSUPPORTED_EXT;
 581       return;
 582    }
 583    if (depth->Type == GL_TEXTURE &&
 584        stencil->Type == GL_TEXTURE &&
 585        depth->Texture != stencil->Texture) {
 586       fb->_Status = GL_FRAMEBUFFER_UNSUPPORTED_EXT;
 587       st_fbo_invalid("Different Depth/Stencil textures");
 588       return;
 589    }
 590
 591    if (!st_validate_attachment(ctx,
 592                                screen,
 593                                depth,
 594                                PIPE_BIND_DEPTH_STENCIL)) {
 595       fb->_Status = GL_FRAMEBUFFER_UNSUPPORTED_EXT;
 596       return;
 597    }
 598    if (!st_validate_attachment(ctx,
 599                                screen,
 600                                stencil,
 601                                PIPE_BIND_DEPTH_STENCIL)) {
 602       fb->_Status = GL_FRAMEBUFFER_UNSUPPORTED_EXT;
 603       return;
 604    }
 605    for (i = 0; i < ctx->Const.MaxColorAttachments; i++) {
 606       struct gl_renderbuffer_attachment *att =
 607             &fb->Attachment[BUFFER_COLOR0 + i];
 608       enum pipe_format format;
 609
 610       if (!st_validate_attachment(ctx,
 611                                   screen,
 612                                   att,
 613                                   PIPE_BIND_RENDER_TARGET)) {
 614          fb->_Status = GL_FRAMEBUFFER_UNSUPPORTED_EXT;
 615          return;
 616       }
 617
 618       if (!mixed_formats) {
 619          /* Disallow mixed formats. */
 620          if (att->Type != GL_NONE) {
 621             format = st_renderbuffer(att->Renderbuffer)->surface->format;
 622          } else {
 623             continue;
 624          }
 625
 626          if (first_format == PIPE_FORMAT_NONE) {
 627             first_format = format;
 628          } else if (format != first_format) {
 629             fb->_Status = GL_FRAMEBUFFER_UNSUPPORTED_EXT;
 630             st_fbo_invalid("Mixed color formats");
 631             return;
 632          }
 633       }
 634    }
 635 }
 636
 637
 638 /**
 639  * Called via glDrawBuffer.
 640  */
 641 static void
 642 st_DrawBuffers(struct gl_context *ctx, GLsizei count, const GLenum *buffers)
 643 {
 644    struct st_context *st = st_context(ctx);
 645    struct gl_framebuffer *fb = ctx->DrawBuffer;
 646    GLuint i;
 647
 648    (void) count;
 649    (void) buffers;
 650
 651    /* add the renderbuffers on demand */
 652    for (i = 0; i < fb->_NumColorDrawBuffers; i++) {
 653       gl_buffer_index idx = fb->_ColorDrawBufferIndexes[i];
 654       st_manager_add_color_renderbuffer(st, fb, idx);
 655    }
 656 }
 657
 658
 659 /**
 660  * Called via glReadBuffer.
 661  */
 662 static void
 663 st_ReadBuffer(struct gl_context *ctx, GLenum buffer)
 664 {
 665    struct st_context *st = st_context(ctx);
 666    struct gl_framebuffer *fb = ctx->ReadBuffer;
 667
 668    (void) buffer;
 669
 670    /* add the renderbuffer on demand */
 671    st_manager_add_color_renderbuffer(st, fb, fb->_ColorReadBufferIndex);
 672 }
 673
 674
 675
 676 /**
 677  * Called via ctx->Driver.MapRenderbuffer.
 678  */
 679 static void
 680 st_MapRenderbuffer(struct gl_context *ctx,
 681                    struct gl_renderbuffer *rb,
 682                    GLuint x, GLuint y, GLuint w, GLuint h,
 683                    GLbitfield mode,
 684                    GLubyte **mapOut, GLint *rowStrideOut)
 685 {
 686    struct st_context *st = st_context(ctx);
 687    struct st_renderbuffer *strb = st_renderbuffer(rb);
 688    struct pipe_context *pipe = st->pipe;
 689    const GLboolean invert = rb->Name == 0;
 690    unsigned usage;
 691    GLuint y2;
 692    GLubyte *map;
 693
 694    if (strb->software) {
 695       /* software-allocated renderbuffer (probably an accum buffer) */
 696       if (strb->data) {
 697          GLint bpp = _mesa_get_format_bytes(strb->Base.Format);
 698          GLint stride = _mesa_format_row_stride(strb->Base.Format,
 699                                                 strb->Base.Width);
 700          *mapOut = (GLubyte *) strb->data + y * stride + x * bpp;
 701          *rowStrideOut = stride;
 702       }
 703       else {
 704          *mapOut = NULL;
 705          *rowStrideOut = 0;
 706       }
 707       return;
 708    }
 709
 710    usage = 0x0;
 711    if (mode & GL_MAP_READ_BIT)
 712       usage |= PIPE_TRANSFER_READ;
 713    if (mode & GL_MAP_WRITE_BIT)
 714       usage |= PIPE_TRANSFER_WRITE;
 715    if (mode & GL_MAP_INVALIDATE_RANGE_BIT)
 716       usage |= PIPE_TRANSFER_DISCARD_RANGE;
 717
 718    /* Note: y=0=bottom of buffer while y2=0=top of buffer.
 719     * 'invert' will be true for window-system buffers and false for
 720     * user-allocated renderbuffers and textures.
 721     */
 722    if (invert)
 723       y2 = strb->Base.Height - y - h;
 724    else
 725       y2 = y;
 726
 727     map = pipe_transfer_map(pipe,
 728                             strb->texture,
 729                             strb->rtt_level,
 730                             strb->rtt_face + strb->rtt_slice,
 731                             usage, x, y2, w, h, &strb->transfer);
 732    if (map) {
 733       if (invert) {
 734          *rowStrideOut = -(int) strb->transfer->stride;
 735          map += (h - 1) * strb->transfer->stride;
 736       }
 737       else {
 738          *rowStrideOut = strb->transfer->stride;
 739       }
 740       *mapOut = map;
 741    }
 742    else {
 743       *mapOut = NULL;
 744       *rowStrideOut = 0;
 745    }
 746 }
 747
 748
 749 /**
 750  * Called via ctx->Driver.UnmapRenderbuffer.
 751  */
 752 static void
 753 st_UnmapRenderbuffer(struct gl_context *ctx,
 754                      struct gl_renderbuffer *rb)
 755 {
 756    struct st_context *st = st_context(ctx);
 757    struct st_renderbuffer *strb = st_renderbuffer(rb);
 758    struct pipe_context *pipe = st->pipe;
 759
 760    if (strb->software) {
 761       /* software-allocated renderbuffer (probably an accum buffer) */
 762       return;
 763    }
 764
 765    pipe_transfer_unmap(pipe, strb->transfer);
 766    strb->transfer = NULL;
 767 }
 768
 769
 770
 771 void st_init_fbo_functions(struct dd_function_table *functions)
 772 {
 773    functions->NewFramebuffer = st_new_framebuffer;
 774    functions->NewRenderbuffer = st_new_renderbuffer;
 775    functions->BindFramebuffer = st_bind_framebuffer;
 776    functions->FramebufferRenderbuffer = _mesa_framebuffer_renderbuffer;
 777    functions->RenderTexture = st_render_texture;
 778    functions->FinishRenderTexture = st_finish_render_texture;
 779    functions->ValidateFramebuffer = st_validate_framebuffer;
 780
 781    functions->DrawBuffers = st_DrawBuffers;
 782    functions->ReadBuffer = st_ReadBuffer;
 783
 784    functions->MapRenderbuffer = st_MapRenderbuffer;
 785    functions->UnmapRenderbuffer = st_UnmapRenderbuffer;
 786 }
 787
 788