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_context *pipe = st->pipe;
 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_surface surf_tmpl;
 120    struct pipe_resource templ;
 121
 122    /* init renderbuffer fields */
 123    strb->Base.Width  = width;
 124    strb->Base.Height = height;
 125    strb->Base._BaseFormat = _mesa_base_fbo_format(ctx, internalFormat);
 126    strb->defined = GL_FALSE;  /* undefined contents now */
 127
 128    if (strb->software) {
 129       return st_renderbuffer_alloc_sw_storage(ctx, rb, internalFormat,
 130                                               width, height);
 131    }
 132
 133    /* Free the old surface and texture
 134     */
 135    pipe_surface_reference( &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     * So let's find the supported number of samples closest to NumSamples.
 159     * (NumSamples == 1) is treated the same as (NumSamples == 0).
 160     */
 161    if (rb->NumSamples > 1) {
 162       unsigned i;
 163
 164       for (i = rb->NumSamples; i <= ctx->Const.MaxSamples; i++) {
 165          format = st_choose_renderbuffer_format(st, internalFormat, i);
 166
 167          if (format != PIPE_FORMAT_NONE) {
 168             rb->NumSamples = i;
 169             break;
 170          }
 171       }
 172    } else {
 173       format = st_choose_renderbuffer_format(st, internalFormat, 0);
 174    }
 175
 176    /* Not setting gl_renderbuffer::Format here will cause
 177     * FRAMEBUFFER_UNSUPPORTED and ValidateFramebuffer will not be called.
 178     */
 179    if (format == PIPE_FORMAT_NONE) {
 180       return GL_TRUE;
 181    }
 182
 183    strb->Base.Format = st_pipe_format_to_mesa_format(format);
 184
 185    if (width == 0 || height == 0) {
 186       /* if size is zero, nothing to allocate */
 187       return GL_TRUE;
 188    }
 189
 190    /* Setup new texture template.
 191     */
 192    memset(&templ, 0, sizeof(templ));
 193    templ.target = st->internal_target;
 194    templ.format = format;
 195    templ.width0 = width;
 196    templ.height0 = height;
 197    templ.depth0 = 1;
 198    templ.array_size = 1;
 199    templ.nr_samples = rb->NumSamples;
 200    if (util_format_is_depth_or_stencil(format)) {
 201       templ.bind = PIPE_BIND_DEPTH_STENCIL;
 202    }
 203    else if (strb->Base.Name != 0) {
 204       /* this is a user-created renderbuffer */
 205       templ.bind = PIPE_BIND_RENDER_TARGET;
 206    }
 207    else {
 208       /* this is a window-system buffer */
 209       templ.bind = (PIPE_BIND_DISPLAY_TARGET |
 210                     PIPE_BIND_RENDER_TARGET);
 211    }
 212
 213    strb->texture = screen->resource_create(screen, &templ);
 214
 215    if (!strb->texture)
 216       return FALSE;
 217
 218    u_surface_default_template(&surf_tmpl, strb->texture);
 219    strb->surface = pipe->create_surface(pipe,
 220                                         strb->texture,
 221                                         &surf_tmpl);
 222    if (strb->surface) {
 223       assert(strb->surface->texture);
 224       assert(strb->surface->format);
 225       assert(strb->surface->width == width);
 226       assert(strb->surface->height == height);
 227    }
 228
 229    return strb->surface != NULL;
 230 }
 231
 232
 233 /**
 234  * gl_renderbuffer::Delete()
 235  */
 236 static void
 237 st_renderbuffer_delete(struct gl_context *ctx, struct gl_renderbuffer *rb)
 238 {
 239    struct st_renderbuffer *strb = st_renderbuffer(rb);
 240    if (ctx) {
 241       struct st_context *st = st_context(ctx);
 242       pipe_surface_release(st->pipe, &strb->surface);
 243    }
 244    pipe_resource_reference(&strb->texture, NULL);
 245    free(strb->data);
 246    _mesa_delete_renderbuffer(ctx, rb);
 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 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_R8G8B8A8_SRGB:
 302    case PIPE_FORMAT_B8G8R8A8_SRGB:
 303    case PIPE_FORMAT_A8R8G8B8_SRGB:
 304       strb->Base.InternalFormat = GL_SRGB8_ALPHA8;
 305       break;
 306    case PIPE_FORMAT_R8G8B8X8_SRGB:
 307    case PIPE_FORMAT_B8G8R8X8_SRGB:
 308    case PIPE_FORMAT_X8R8G8B8_SRGB:
 309       strb->Base.InternalFormat = GL_SRGB8;
 310       break;
 311    case PIPE_FORMAT_B5G5R5A1_UNORM:
 312       strb->Base.InternalFormat = GL_RGB5_A1;
 313       break;
 314    case PIPE_FORMAT_B4G4R4A4_UNORM:
 315       strb->Base.InternalFormat = GL_RGBA4;
 316       break;
 317    case PIPE_FORMAT_B5G6R5_UNORM:
 318       strb->Base.InternalFormat = GL_RGB565;
 319       break;
 320    case PIPE_FORMAT_Z16_UNORM:
 321       strb->Base.InternalFormat = GL_DEPTH_COMPONENT16;
 322       break;
 323    case PIPE_FORMAT_Z32_UNORM:
 324       strb->Base.InternalFormat = GL_DEPTH_COMPONENT32;
 325       break;
 326    case PIPE_FORMAT_Z24_UNORM_S8_UINT:
 327    case PIPE_FORMAT_S8_UINT_Z24_UNORM:
 328       strb->Base.InternalFormat = GL_DEPTH24_STENCIL8_EXT;
 329       break;
 330    case PIPE_FORMAT_Z24X8_UNORM:
 331    case PIPE_FORMAT_X8Z24_UNORM:
 332       strb->Base.InternalFormat = GL_DEPTH_COMPONENT24;
 333       break;
 334    case PIPE_FORMAT_S8_UINT:
 335       strb->Base.InternalFormat = GL_STENCIL_INDEX8_EXT;
 336       break;
 337    case PIPE_FORMAT_R16G16B16A16_SNORM:
 338       /* accum buffer */
 339       strb->Base.InternalFormat = GL_RGBA16_SNORM;
 340       break;
 341    case PIPE_FORMAT_R16G16B16A16_UNORM:
 342       strb->Base.InternalFormat = GL_RGBA16;
 343       break;
 344    case PIPE_FORMAT_R8_UNORM:
 345       strb->Base.InternalFormat = GL_R8;
 346       break;
 347    case PIPE_FORMAT_R8G8_UNORM:
 348       strb->Base.InternalFormat = GL_RG8;
 349       break;
 350    case PIPE_FORMAT_R16_UNORM:
 351       strb->Base.InternalFormat = GL_R16;
 352       break;
 353    case PIPE_FORMAT_R16G16_UNORM:
 354       strb->Base.InternalFormat = GL_RG16;
 355       break;
 356    case PIPE_FORMAT_R32G32B32A32_FLOAT:
 357       strb->Base.InternalFormat = GL_RGBA32F;
 358       break;
 359    case PIPE_FORMAT_R16G16B16A16_FLOAT:
 360       strb->Base.InternalFormat = GL_RGBA16F;
 361       break;
 362    default:
 363       _mesa_problem(NULL,
 364                     "Unexpected format %s in st_new_renderbuffer_fb",
 365                     util_format_name(format));
 366       free(strb);
 367       return NULL;
 368    }
 369
 370    /* st-specific methods */
 371    strb->Base.Delete = st_renderbuffer_delete;
 372    strb->Base.AllocStorage = st_renderbuffer_alloc_storage;
 373
 374    /* surface is allocated in st_renderbuffer_alloc_storage() */
 375    strb->surface = NULL;
 376
 377    return &strb->Base;
 378 }
 379
 380
 381 /**
 382  * Create or update the pipe_surface of a FBO renderbuffer.
 383  * This is usually called after st_finalize_texture.
 384  */
 385 void
 386 st_update_renderbuffer_surface(struct st_context *st,
 387                                struct st_renderbuffer *strb)
 388 {
 389    struct pipe_context *pipe = st->pipe;
 390    struct pipe_resource *resource = strb->texture;
 391    const struct st_texture_object *stTexObj = NULL;
 392    unsigned rtt_width = strb->Base.Width;
 393    unsigned rtt_height = strb->Base.Height;
 394    unsigned rtt_depth = strb->Base.Depth;
 395
 396    /*
 397     * For winsys fbo, it is possible that the renderbuffer is sRGB-capable but
 398     * the format of strb->texture is linear (because we have no control over
 399     * the format).  Check strb->Base.Format instead of strb->texture->format
 400     * to determine if the rb is sRGB-capable.
 401     */
 402    boolean enable_srgb = st->ctx->Color.sRGBEnabled &&
 403       _mesa_get_format_color_encoding(strb->Base.Format) == GL_SRGB;
 404    enum pipe_format format = resource->format;
 405
 406    if (strb->is_rtt) {
 407       stTexObj = st_texture_object(strb->Base.TexImage->TexObject);
 408       if (stTexObj->surface_based)
 409          format = stTexObj->surface_format;
 410    }
 411
 412    format = enable_srgb ? util_format_srgb(format) : util_format_linear(format);
 413
 414    if (resource->target == PIPE_TEXTURE_1D_ARRAY) {
 415       rtt_depth = rtt_height;
 416       rtt_height = 1;
 417    }
 418
 419    /* find matching mipmap level size */
 420    unsigned level;
 421    for (level = 0; level <= resource->last_level; level++) {
 422       if (u_minify(resource->width0, level) == rtt_width &&
 423           u_minify(resource->height0, level) == rtt_height &&
 424           (resource->target != PIPE_TEXTURE_3D ||
 425            u_minify(resource->depth0, level) == rtt_depth)) {
 426          break;
 427       }
 428    }
 429    assert(level <= resource->last_level);
 430
 431    /* determine the layer bounds */
 432    unsigned first_layer, last_layer;
 433    if (strb->rtt_layered) {
 434       first_layer = 0;
 435       last_layer = util_max_layer(strb->texture, level);
 436    }
 437    else {
 438       first_layer =
 439       last_layer = strb->rtt_face + strb->rtt_slice;
 440    }
 441
 442    /* Adjust for texture views */
 443    if (strb->is_rtt && resource->array_size > 1 &&
 444        stTexObj->base.Immutable) {
 445       const struct gl_texture_object *tex = &stTexObj->base;
 446       first_layer += tex->MinLayer;
 447       if (!strb->rtt_layered)
 448          last_layer += tex->MinLayer;
 449       else
 450          last_layer = MIN2(first_layer + tex->NumLayers - 1, last_layer);
 451    }
 452
 453    if (!strb->surface ||
 454        strb->surface->texture->nr_samples != strb->Base.NumSamples ||
 455        strb->surface->format != format ||
 456        strb->surface->texture != resource ||
 457        strb->surface->width != rtt_width ||
 458        strb->surface->height != rtt_height ||
 459        strb->surface->u.tex.level != level ||
 460        strb->surface->u.tex.first_layer != first_layer ||
 461        strb->surface->u.tex.last_layer != last_layer) {
 462       /* create a new pipe_surface */
 463       struct pipe_surface surf_tmpl;
 464       memset(&surf_tmpl, 0, sizeof(surf_tmpl));
 465       surf_tmpl.format = format;
 466       surf_tmpl.u.tex.level = level;
 467       surf_tmpl.u.tex.first_layer = first_layer;
 468       surf_tmpl.u.tex.last_layer = last_layer;
 469
 470       pipe_surface_release(pipe, &strb->surface);
 471
 472       strb->surface = pipe->create_surface(pipe, resource, &surf_tmpl);
 473    }
 474 }
 475
 476 /**
 477  * Called by ctx->Driver.RenderTexture
 478  */
 479 static void
 480 st_render_texture(struct gl_context *ctx,
 481                   struct gl_framebuffer *fb,
 482                   struct gl_renderbuffer_attachment *att)
 483 {
 484    struct st_context *st = st_context(ctx);
 485    struct pipe_context *pipe = st->pipe;
 486    struct gl_renderbuffer *rb = att->Renderbuffer;
 487    struct st_renderbuffer *strb = st_renderbuffer(rb);
 488    struct pipe_resource *pt;
 489
 490    if (!st_finalize_texture(ctx, pipe, att->Texture, att->CubeMapFace))
 491       return;
 492
 493    pt = st_get_texobj_resource(att->Texture);
 494    assert(pt);
 495
 496    /* point renderbuffer at texobject */
 497    strb->is_rtt = TRUE;
 498    strb->rtt_face = att->CubeMapFace;
 499    strb->rtt_slice = att->Zoffset;
 500    strb->rtt_layered = att->Layered;
 501    pipe_resource_reference(&strb->texture, pt);
 502
 503    st_update_renderbuffer_surface(st, strb);
 504
 505    /* Invalidate buffer state so that the pipe's framebuffer state
 506     * gets updated.
 507     * That's where the new renderbuffer (which we just created) gets
 508     * passed to the pipe as a (color/depth) render target.
 509     */
 510    st_invalidate_state(ctx, _NEW_BUFFERS);
 511
 512
 513    /* Need to trigger a call to update_framebuffer() since we just
 514     * attached a new renderbuffer.
 515     */
 516    ctx->NewState |= _NEW_BUFFERS;
 517 }
 518
 519
 520 /**
 521  * Called via ctx->Driver.FinishRenderTexture.
 522  */
 523 static void
 524 st_finish_render_texture(struct gl_context *ctx, struct gl_renderbuffer *rb)
 525 {
 526    struct st_renderbuffer *strb = st_renderbuffer(rb);
 527
 528    if (!strb)
 529       return;
 530
 531    strb->is_rtt = FALSE;
 532
 533    /* restore previous framebuffer state */
 534    st_invalidate_state(ctx, _NEW_BUFFERS);
 535 }
 536
 537
 538 /** Debug helper */
 539 static void
 540 st_fbo_invalid(const char *reason)
 541 {
 542    if (MESA_DEBUG_FLAGS & DEBUG_INCOMPLETE_FBO) {
 543       _mesa_debug(NULL, "Invalid FBO: %s\n", reason);
 544    }
 545 }
 546
 547
 548 /**
 549  * Validate a renderbuffer attachment for a particular set of bindings.
 550  */
 551 static GLboolean
 552 st_validate_attachment(struct gl_context *ctx,
 553                        struct pipe_screen *screen,
 554                        const struct gl_renderbuffer_attachment *att,
 555                        unsigned bindings)
 556 {
 557    const struct st_texture_object *stObj = st_texture_object(att->Texture);
 558    enum pipe_format format;
 559    mesa_format texFormat;
 560    GLboolean valid;
 561
 562    /* Sanity check: we must be binding the surface as a (color) render target
 563     * or depth/stencil target.
 564     */
 565    assert(bindings == PIPE_BIND_RENDER_TARGET ||
 566           bindings == PIPE_BIND_DEPTH_STENCIL);
 567
 568    /* Only validate texture attachments for now, since
 569     * st_renderbuffer_alloc_storage makes sure that
 570     * the format is supported.
 571     */
 572    if (att->Type != GL_TEXTURE)
 573       return GL_TRUE;
 574
 575    if (!stObj || !stObj->pt)
 576       return GL_FALSE;
 577
 578    format = stObj->pt->format;
 579    texFormat = att->Renderbuffer->TexImage->TexFormat;
 580
 581    /* If the encoding is sRGB and sRGB rendering cannot be enabled,
 582     * check for linear format support instead.
 583     * Later when we create a surface, we change the format to a linear one. */
 584    if (!ctx->Extensions.EXT_framebuffer_sRGB &&
 585        _mesa_get_format_color_encoding(texFormat) == GL_SRGB) {
 586       const mesa_format linearFormat = _mesa_get_srgb_format_linear(texFormat);
 587       format = st_mesa_format_to_pipe_format(st_context(ctx), linearFormat);
 588    }
 589
 590    valid = screen->is_format_supported(screen, format,
 591                                       PIPE_TEXTURE_2D,
 592                                       stObj->pt->nr_samples, bindings);
 593    if (!valid) {
 594       st_fbo_invalid("Invalid format");
 595    }
 596
 597    return valid;
 598 }
 599
 600
 601 /**
 602  * Check that the framebuffer configuration is valid in terms of what
 603  * the driver can support.
 604  *
 605  * For Gallium we only supports combined Z+stencil, not separate buffers.
 606  */
 607 static void
 608 st_validate_framebuffer(struct gl_context *ctx, struct gl_framebuffer *fb)
 609 {
 610    struct st_context *st = st_context(ctx);
 611    struct pipe_screen *screen = st->pipe->screen;
 612    const struct gl_renderbuffer_attachment *depth =
 613          &fb->Attachment[BUFFER_DEPTH];
 614    const struct gl_renderbuffer_attachment *stencil =
 615          &fb->Attachment[BUFFER_STENCIL];
 616    GLuint i;
 617    enum pipe_format first_format = PIPE_FORMAT_NONE;
 618    boolean mixed_formats =
 619          screen->get_param(screen, PIPE_CAP_MIXED_COLORBUFFER_FORMATS) != 0;
 620
 621    if (depth->Type && stencil->Type && depth->Type != stencil->Type) {
 622       st_fbo_invalid("Different Depth/Stencil buffer formats");
 623       fb->_Status = GL_FRAMEBUFFER_UNSUPPORTED_EXT;
 624       return;
 625    }
 626    if (depth->Type == GL_RENDERBUFFER_EXT &&
 627        stencil->Type == GL_RENDERBUFFER_EXT &&
 628        depth->Renderbuffer != stencil->Renderbuffer) {
 629       st_fbo_invalid("Separate Depth/Stencil buffers");
 630       fb->_Status = GL_FRAMEBUFFER_UNSUPPORTED_EXT;
 631       return;
 632    }
 633    if (depth->Type == GL_TEXTURE &&
 634        stencil->Type == GL_TEXTURE &&
 635        depth->Texture != stencil->Texture) {
 636       fb->_Status = GL_FRAMEBUFFER_UNSUPPORTED_EXT;
 637       st_fbo_invalid("Different Depth/Stencil textures");
 638       return;
 639    }
 640
 641    if (!st_validate_attachment(ctx,
 642                                screen,
 643                                depth,
 644                                PIPE_BIND_DEPTH_STENCIL)) {
 645       fb->_Status = GL_FRAMEBUFFER_UNSUPPORTED_EXT;
 646       st_fbo_invalid("Invalid depth attachment");
 647       return;
 648    }
 649    if (!st_validate_attachment(ctx,
 650                                screen,
 651                                stencil,
 652                                PIPE_BIND_DEPTH_STENCIL)) {
 653       fb->_Status = GL_FRAMEBUFFER_UNSUPPORTED_EXT;
 654       st_fbo_invalid("Invalid stencil attachment");
 655       return;
 656    }
 657    for (i = 0; i < ctx->Const.MaxColorAttachments; i++) {
 658       struct gl_renderbuffer_attachment *att =
 659             &fb->Attachment[BUFFER_COLOR0 + i];
 660       enum pipe_format format;
 661
 662       if (!st_validate_attachment(ctx,
 663                                   screen,
 664                                   att,
 665                                   PIPE_BIND_RENDER_TARGET)) {
 666          fb->_Status = GL_FRAMEBUFFER_UNSUPPORTED_EXT;
 667          st_fbo_invalid("Invalid color attachment");
 668          return;
 669       }
 670
 671       if (!mixed_formats) {
 672          /* Disallow mixed formats. */
 673          if (att->Type != GL_NONE) {
 674             format = st_renderbuffer(att->Renderbuffer)->surface->format;
 675          } else {
 676             continue;
 677          }
 678
 679          if (first_format == PIPE_FORMAT_NONE) {
 680             first_format = format;
 681          } else if (format != first_format) {
 682             fb->_Status = GL_FRAMEBUFFER_UNSUPPORTED_EXT;
 683             st_fbo_invalid("Mixed color formats");
 684             return;
 685          }
 686       }
 687    }
 688 }
 689
 690
 691 /**
 692  * Called via glDrawBuffer.  We only provide this driver function so that we
 693  * can check if we need to allocate a new renderbuffer.  Specifically, we
 694  * don't usually allocate a front color buffer when using a double-buffered
 695  * visual.  But if the app calls glDrawBuffer(GL_FRONT) we need to allocate
 696  * that buffer.  Note, this is only for window system buffers, not user-
 697  * created FBOs.
 698  */
 699 static void
 700 st_DrawBuffers(struct gl_context *ctx, GLsizei count, const GLenum *buffers)
 701 {
 702    struct st_context *st = st_context(ctx);
 703    struct gl_framebuffer *fb = ctx->DrawBuffer;
 704
 705    (void) count;
 706    (void) buffers;
 707
 708    if (_mesa_is_winsys_fbo(fb)) {
 709       GLuint i;
 710       /* add the renderbuffers on demand */
 711       for (i = 0; i < fb->_NumColorDrawBuffers; i++) {
 712          GLint idx = fb->_ColorDrawBufferIndexes[i];
 713
 714          if (idx >= 0) {
 715             st_manager_add_color_renderbuffer(st, fb, idx);
 716          }
 717       }
 718    }
 719 }
 720
 721
 722 /**
 723  * Called via glReadBuffer.  As with st_DrawBuffers, we use this function
 724  * to check if we need to allocate a renderbuffer on demand.
 725  */
 726 static void
 727 st_ReadBuffer(struct gl_context *ctx, GLenum buffer)
 728 {
 729    struct st_context *st = st_context(ctx);
 730    struct gl_framebuffer *fb = ctx->ReadBuffer;
 731
 732    (void) buffer;
 733
 734    /* Check if we need to allocate a front color buffer.
 735     * Front buffers are often allocated on demand (other color buffers are
 736     * always allocated in advance).
 737     */
 738    if ((fb->_ColorReadBufferIndex == BUFFER_FRONT_LEFT ||
 739         fb->_ColorReadBufferIndex == BUFFER_FRONT_RIGHT) &&
 740        fb->Attachment[fb->_ColorReadBufferIndex].Type == GL_NONE) {
 741       assert(_mesa_is_winsys_fbo(fb));
 742       /* add the buffer */
 743       st_manager_add_color_renderbuffer(st, fb, fb->_ColorReadBufferIndex);
 744       _mesa_update_state(ctx);
 745       st_validate_state(st, ST_PIPELINE_UPDATE_FRAMEBUFFER);
 746    }
 747 }
 748
 749
 750
 751 /**
 752  * Called via ctx->Driver.MapRenderbuffer.
 753  */
 754 static void
 755 st_MapRenderbuffer(struct gl_context *ctx,
 756                    struct gl_renderbuffer *rb,
 757                    GLuint x, GLuint y, GLuint w, GLuint h,
 758                    GLbitfield mode,
 759                    GLubyte **mapOut, GLint *rowStrideOut)
 760 {
 761    struct st_context *st = st_context(ctx);
 762    struct st_renderbuffer *strb = st_renderbuffer(rb);
 763    struct pipe_context *pipe = st->pipe;
 764    const GLboolean invert = rb->Name == 0;
 765    unsigned usage;
 766    GLuint y2;
 767    GLubyte *map;
 768
 769    if (strb->software) {
 770       /* software-allocated renderbuffer (probably an accum buffer) */
 771       if (strb->data) {
 772          GLint bpp = _mesa_get_format_bytes(strb->Base.Format);
 773          GLint stride = _mesa_format_row_stride(strb->Base.Format,
 774                                                 strb->Base.Width);
 775          *mapOut = (GLubyte *) strb->data + y * stride + x * bpp;
 776          *rowStrideOut = stride;
 777       }
 778       else {
 779          *mapOut = NULL;
 780          *rowStrideOut = 0;
 781       }
 782       return;
 783    }
 784
 785    usage = 0x0;
 786    if (mode & GL_MAP_READ_BIT)
 787       usage |= PIPE_TRANSFER_READ;
 788    if (mode & GL_MAP_WRITE_BIT)
 789       usage |= PIPE_TRANSFER_WRITE;
 790    if (mode & GL_MAP_INVALIDATE_RANGE_BIT)
 791       usage |= PIPE_TRANSFER_DISCARD_RANGE;
 792
 793    /* Note: y=0=bottom of buffer while y2=0=top of buffer.
 794     * 'invert' will be true for window-system buffers and false for
 795     * user-allocated renderbuffers and textures.
 796     */
 797    if (invert)
 798       y2 = strb->Base.Height - y - h;
 799    else
 800       y2 = y;
 801
 802     map = pipe_transfer_map(pipe,
 803                             strb->texture,
 804                             strb->surface->u.tex.level,
 805                             strb->surface->u.tex.first_layer,
 806                             usage, x, y2, w, h, &strb->transfer);
 807    if (map) {
 808       if (invert) {
 809          *rowStrideOut = -(int) strb->transfer->stride;
 810          map += (h - 1) * strb->transfer->stride;
 811       }
 812       else {
 813          *rowStrideOut = strb->transfer->stride;
 814       }
 815       *mapOut = map;
 816    }
 817    else {
 818       *mapOut = NULL;
 819       *rowStrideOut = 0;
 820    }
 821 }
 822
 823
 824 /**
 825  * Called via ctx->Driver.UnmapRenderbuffer.
 826  */
 827 static void
 828 st_UnmapRenderbuffer(struct gl_context *ctx,
 829                      struct gl_renderbuffer *rb)
 830 {
 831    struct st_context *st = st_context(ctx);
 832    struct st_renderbuffer *strb = st_renderbuffer(rb);
 833    struct pipe_context *pipe = st->pipe;
 834
 835    if (strb->software) {
 836       /* software-allocated renderbuffer (probably an accum buffer) */
 837       return;
 838    }
 839
 840    pipe_transfer_unmap(pipe, strb->transfer);
 841    strb->transfer = NULL;
 842 }
 843
 844
 845
 846 void st_init_fbo_functions(struct dd_function_table *functions)
 847 {
 848    functions->NewFramebuffer = _mesa_new_framebuffer;
 849    functions->NewRenderbuffer = st_new_renderbuffer;
 850    functions->FramebufferRenderbuffer = _mesa_FramebufferRenderbuffer_sw;
 851    functions->RenderTexture = st_render_texture;
 852    functions->FinishRenderTexture = st_finish_render_texture;
 853    functions->ValidateFramebuffer = st_validate_framebuffer;
 854
 855    functions->DrawBuffers = st_DrawBuffers;
 856    functions->ReadBuffer = st_ReadBuffer;
 857
 858    functions->MapRenderbuffer = st_MapRenderbuffer;
 859    functions->UnmapRenderbuffer = st_UnmapRenderbuffer;
 860 }
 861
 862