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     * 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    st_update_renderbuffer_surface(st, strb);
 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_srgb);
 233       pipe_surface_release(st->pipe, &strb->surface_linear);
 234       strb->surface = NULL;
 235    }
 236    pipe_resource_reference(&strb->texture, NULL);
 237    free(strb->data);
 238    _mesa_delete_renderbuffer(ctx, rb);
 239 }
 240
 241
 242 /**
 243  * Called via ctx->Driver.NewRenderbuffer()
 244  */
 245 static struct gl_renderbuffer *
 246 st_new_renderbuffer(struct gl_context *ctx, GLuint name)
 247 {
 248    struct st_renderbuffer *strb = ST_CALLOC_STRUCT(st_renderbuffer);
 249    if (strb) {
 250       assert(name != 0);
 251       _mesa_init_renderbuffer(&strb->Base, name);
 252       strb->Base.Delete = st_renderbuffer_delete;
 253       strb->Base.AllocStorage = st_renderbuffer_alloc_storage;
 254       return &strb->Base;
 255    }
 256    return NULL;
 257 }
 258
 259
 260 /**
 261  * Allocate a renderbuffer for an on-screen window (not a user-created
 262  * renderbuffer).  The window system code determines the format.
 263  */
 264 struct gl_renderbuffer *
 265 st_new_renderbuffer_fb(enum pipe_format format, int samples, boolean sw)
 266 {
 267    struct st_renderbuffer *strb;
 268
 269    strb = ST_CALLOC_STRUCT(st_renderbuffer);
 270    if (!strb) {
 271       _mesa_error(NULL, GL_OUT_OF_MEMORY, "creating renderbuffer");
 272       return NULL;
 273    }
 274
 275    _mesa_init_renderbuffer(&strb->Base, 0);
 276    strb->Base.ClassID = 0x4242; /* just a unique value */
 277    strb->Base.NumSamples = samples;
 278    strb->Base.Format = st_pipe_format_to_mesa_format(format);
 279    strb->Base._BaseFormat = _mesa_get_format_base_format(strb->Base.Format);
 280    strb->software = sw;
 281
 282    switch (format) {
 283    case PIPE_FORMAT_R8G8B8A8_UNORM:
 284    case PIPE_FORMAT_B8G8R8A8_UNORM:
 285    case PIPE_FORMAT_A8R8G8B8_UNORM:
 286       strb->Base.InternalFormat = GL_RGBA8;
 287       break;
 288    case PIPE_FORMAT_R8G8B8X8_UNORM:
 289    case PIPE_FORMAT_B8G8R8X8_UNORM:
 290    case PIPE_FORMAT_X8R8G8B8_UNORM:
 291       strb->Base.InternalFormat = GL_RGB8;
 292       break;
 293    case PIPE_FORMAT_R8G8B8A8_SRGB:
 294    case PIPE_FORMAT_B8G8R8A8_SRGB:
 295    case PIPE_FORMAT_A8R8G8B8_SRGB:
 296       strb->Base.InternalFormat = GL_SRGB8_ALPHA8;
 297       break;
 298    case PIPE_FORMAT_R8G8B8X8_SRGB:
 299    case PIPE_FORMAT_B8G8R8X8_SRGB:
 300    case PIPE_FORMAT_X8R8G8B8_SRGB:
 301       strb->Base.InternalFormat = GL_SRGB8;
 302       break;
 303    case PIPE_FORMAT_B5G5R5A1_UNORM:
 304       strb->Base.InternalFormat = GL_RGB5_A1;
 305       break;
 306    case PIPE_FORMAT_B4G4R4A4_UNORM:
 307       strb->Base.InternalFormat = GL_RGBA4;
 308       break;
 309    case PIPE_FORMAT_B5G6R5_UNORM:
 310       strb->Base.InternalFormat = GL_RGB565;
 311       break;
 312    case PIPE_FORMAT_Z16_UNORM:
 313       strb->Base.InternalFormat = GL_DEPTH_COMPONENT16;
 314       break;
 315    case PIPE_FORMAT_Z32_UNORM:
 316       strb->Base.InternalFormat = GL_DEPTH_COMPONENT32;
 317       break;
 318    case PIPE_FORMAT_Z24_UNORM_S8_UINT:
 319    case PIPE_FORMAT_S8_UINT_Z24_UNORM:
 320       strb->Base.InternalFormat = GL_DEPTH24_STENCIL8_EXT;
 321       break;
 322    case PIPE_FORMAT_Z24X8_UNORM:
 323    case PIPE_FORMAT_X8Z24_UNORM:
 324       strb->Base.InternalFormat = GL_DEPTH_COMPONENT24;
 325       break;
 326    case PIPE_FORMAT_S8_UINT:
 327       strb->Base.InternalFormat = GL_STENCIL_INDEX8_EXT;
 328       break;
 329    case PIPE_FORMAT_R16G16B16A16_SNORM:
 330       /* accum buffer */
 331       strb->Base.InternalFormat = GL_RGBA16_SNORM;
 332       break;
 333    case PIPE_FORMAT_R16G16B16A16_UNORM:
 334       strb->Base.InternalFormat = GL_RGBA16;
 335       break;
 336    case PIPE_FORMAT_R8_UNORM:
 337       strb->Base.InternalFormat = GL_R8;
 338       break;
 339    case PIPE_FORMAT_R8G8_UNORM:
 340       strb->Base.InternalFormat = GL_RG8;
 341       break;
 342    case PIPE_FORMAT_R16_UNORM:
 343       strb->Base.InternalFormat = GL_R16;
 344       break;
 345    case PIPE_FORMAT_R16G16_UNORM:
 346       strb->Base.InternalFormat = GL_RG16;
 347       break;
 348    case PIPE_FORMAT_R32G32B32A32_FLOAT:
 349       strb->Base.InternalFormat = GL_RGBA32F;
 350       break;
 351    case PIPE_FORMAT_R16G16B16A16_FLOAT:
 352       strb->Base.InternalFormat = GL_RGBA16F;
 353       break;
 354    default:
 355       _mesa_problem(NULL,
 356                     "Unexpected format %s in st_new_renderbuffer_fb",
 357                     util_format_name(format));
 358       free(strb);
 359       return NULL;
 360    }
 361
 362    /* st-specific methods */
 363    strb->Base.Delete = st_renderbuffer_delete;
 364    strb->Base.AllocStorage = st_renderbuffer_alloc_storage;
 365
 366    /* surface is allocated in st_renderbuffer_alloc_storage() */
 367    strb->surface = NULL;
 368
 369    return &strb->Base;
 370 }
 371
 372
 373 /**
 374  * Create or update the pipe_surface of a FBO renderbuffer.
 375  * This is usually called after st_finalize_texture.
 376  */
 377 void
 378 st_update_renderbuffer_surface(struct st_context *st,
 379                                struct st_renderbuffer *strb)
 380 {
 381    struct pipe_context *pipe = st->pipe;
 382    struct pipe_resource *resource = strb->texture;
 383    const struct st_texture_object *stTexObj = NULL;
 384    unsigned rtt_width = strb->Base.Width;
 385    unsigned rtt_height = strb->Base.Height;
 386    unsigned rtt_depth = strb->Base.Depth;
 387
 388    /*
 389     * For winsys fbo, it is possible that the renderbuffer is sRGB-capable but
 390     * the format of strb->texture is linear (because we have no control over
 391     * the format).  Check strb->Base.Format instead of strb->texture->format
 392     * to determine if the rb is sRGB-capable.
 393     */
 394    boolean enable_srgb = st->ctx->Color.sRGBEnabled &&
 395       _mesa_get_format_color_encoding(strb->Base.Format) == GL_SRGB;
 396    enum pipe_format format = resource->format;
 397
 398    if (strb->is_rtt) {
 399       stTexObj = st_texture_object(strb->Base.TexImage->TexObject);
 400       if (stTexObj->surface_based)
 401          format = stTexObj->surface_format;
 402    }
 403
 404    format = enable_srgb ? util_format_srgb(format) : util_format_linear(format);
 405
 406    if (resource->target == PIPE_TEXTURE_1D_ARRAY) {
 407       rtt_depth = rtt_height;
 408       rtt_height = 1;
 409    }
 410
 411    /* find matching mipmap level size */
 412    unsigned level;
 413    for (level = 0; level <= resource->last_level; level++) {
 414       if (u_minify(resource->width0, level) == rtt_width &&
 415           u_minify(resource->height0, level) == rtt_height &&
 416           (resource->target != PIPE_TEXTURE_3D ||
 417            u_minify(resource->depth0, level) == rtt_depth)) {
 418          break;
 419       }
 420    }
 421    assert(level <= resource->last_level);
 422
 423    /* determine the layer bounds */
 424    unsigned first_layer, last_layer;
 425    if (strb->rtt_layered) {
 426       first_layer = 0;
 427       last_layer = util_max_layer(strb->texture, level);
 428    }
 429    else {
 430       first_layer =
 431       last_layer = strb->rtt_face + strb->rtt_slice;
 432    }
 433
 434    /* Adjust for texture views */
 435    if (strb->is_rtt && resource->array_size > 1 &&
 436        stTexObj->base.Immutable) {
 437       const struct gl_texture_object *tex = &stTexObj->base;
 438       first_layer += tex->MinLayer;
 439       if (!strb->rtt_layered)
 440          last_layer += tex->MinLayer;
 441       else
 442          last_layer = MIN2(first_layer + tex->NumLayers - 1, last_layer);
 443    }
 444
 445    struct pipe_surface **psurf =
 446       enable_srgb ? &strb->surface_srgb : &strb->surface_linear;
 447    struct pipe_surface *surf = *psurf;
 448
 449    if (!surf ||
 450        surf->texture->nr_samples != strb->Base.NumSamples ||
 451        surf->format != format ||
 452        surf->texture != resource ||
 453        surf->width != rtt_width ||
 454        surf->height != rtt_height ||
 455        surf->u.tex.level != level ||
 456        surf->u.tex.first_layer != first_layer ||
 457        surf->u.tex.last_layer != last_layer) {
 458       /* create a new pipe_surface */
 459       struct pipe_surface surf_tmpl;
 460       memset(&surf_tmpl, 0, sizeof(surf_tmpl));
 461       surf_tmpl.format = format;
 462       surf_tmpl.u.tex.level = level;
 463       surf_tmpl.u.tex.first_layer = first_layer;
 464       surf_tmpl.u.tex.last_layer = last_layer;
 465
 466       pipe_surface_release(pipe, psurf);
 467
 468       *psurf = pipe->create_surface(pipe, resource, &surf_tmpl);
 469    }
 470    strb->surface = *psurf;
 471 }
 472
 473
 474 /**
 475  * Return the pipe_resource which stores a particular texture image.
 476  */
 477 static struct pipe_resource *
 478 get_teximage_resource(struct gl_texture_object *texObj,
 479                       unsigned face, unsigned level)
 480 {
 481    struct st_texture_image *stImg =
 482       st_texture_image(texObj->Image[face][level]);
 483
 484    return stImg->pt;
 485 }
 486
 487
 488 /**
 489  * Called by ctx->Driver.RenderTexture
 490  */
 491 static void
 492 st_render_texture(struct gl_context *ctx,
 493                   struct gl_framebuffer *fb,
 494                   struct gl_renderbuffer_attachment *att)
 495 {
 496    struct st_context *st = st_context(ctx);
 497    struct pipe_context *pipe = st->pipe;
 498    struct gl_renderbuffer *rb = att->Renderbuffer;
 499    struct st_renderbuffer *strb = st_renderbuffer(rb);
 500    struct pipe_resource *pt;
 501
 502    if (!st_finalize_texture(ctx, pipe, att->Texture, att->CubeMapFace))
 503       return;
 504
 505    pt = get_teximage_resource(att->Texture,
 506                               att->CubeMapFace,
 507                               att->TextureLevel);
 508    assert(pt);
 509
 510    /* point renderbuffer at texobject */
 511    strb->is_rtt = TRUE;
 512    strb->rtt_face = att->CubeMapFace;
 513    strb->rtt_slice = att->Zoffset;
 514    strb->rtt_layered = att->Layered;
 515    pipe_resource_reference(&strb->texture, pt);
 516
 517    st_update_renderbuffer_surface(st, strb);
 518
 519    /* Invalidate buffer state so that the pipe's framebuffer state
 520     * gets updated.
 521     * That's where the new renderbuffer (which we just created) gets
 522     * passed to the pipe as a (color/depth) render target.
 523     */
 524    st_invalidate_buffers(st);
 525
 526
 527    /* Need to trigger a call to update_framebuffer() since we just
 528     * attached a new renderbuffer.
 529     */
 530    ctx->NewState |= _NEW_BUFFERS;
 531 }
 532
 533
 534 /**
 535  * Called via ctx->Driver.FinishRenderTexture.
 536  */
 537 static void
 538 st_finish_render_texture(struct gl_context *ctx, struct gl_renderbuffer *rb)
 539 {
 540    struct st_context *st = st_context(ctx);
 541    struct st_renderbuffer *strb = st_renderbuffer(rb);
 542
 543    if (!strb)
 544       return;
 545
 546    strb->is_rtt = FALSE;
 547
 548    /* restore previous framebuffer state */
 549    st_invalidate_buffers(st);
 550 }
 551
 552
 553 /** Debug helper */
 554 static void
 555 st_fbo_invalid(const char *reason)
 556 {
 557    if (MESA_DEBUG_FLAGS & DEBUG_INCOMPLETE_FBO) {
 558       _mesa_debug(NULL, "Invalid FBO: %s\n", reason);
 559    }
 560 }
 561
 562
 563 /**
 564  * Validate a renderbuffer attachment for a particular set of bindings.
 565  */
 566 static GLboolean
 567 st_validate_attachment(struct gl_context *ctx,
 568                        struct pipe_screen *screen,
 569                        const struct gl_renderbuffer_attachment *att,
 570                        unsigned bindings)
 571 {
 572    const struct st_texture_object *stObj = st_texture_object(att->Texture);
 573    enum pipe_format format;
 574    mesa_format texFormat;
 575    GLboolean valid;
 576
 577    /* Sanity check: we must be binding the surface as a (color) render target
 578     * or depth/stencil target.
 579     */
 580    assert(bindings == PIPE_BIND_RENDER_TARGET ||
 581           bindings == PIPE_BIND_DEPTH_STENCIL);
 582
 583    /* Only validate texture attachments for now, since
 584     * st_renderbuffer_alloc_storage makes sure that
 585     * the format is supported.
 586     */
 587    if (att->Type != GL_TEXTURE)
 588       return GL_TRUE;
 589
 590    if (!stObj || !stObj->pt)
 591       return GL_FALSE;
 592
 593    format = stObj->pt->format;
 594    texFormat = att->Renderbuffer->TexImage->TexFormat;
 595
 596    /* If the encoding is sRGB and sRGB rendering cannot be enabled,
 597     * check for linear format support instead.
 598     * Later when we create a surface, we change the format to a linear one. */
 599    if (!ctx->Extensions.EXT_framebuffer_sRGB &&
 600        _mesa_get_format_color_encoding(texFormat) == GL_SRGB) {
 601       const mesa_format linearFormat = _mesa_get_srgb_format_linear(texFormat);
 602       format = st_mesa_format_to_pipe_format(st_context(ctx), linearFormat);
 603    }
 604
 605    valid = screen->is_format_supported(screen, format,
 606                                       PIPE_TEXTURE_2D,
 607                                       stObj->pt->nr_samples, bindings);
 608    if (!valid) {
 609       st_fbo_invalid("Invalid format");
 610    }
 611
 612    return valid;
 613 }
 614
 615
 616 /**
 617  * Check that the framebuffer configuration is valid in terms of what
 618  * the driver can support.
 619  *
 620  * For Gallium we only supports combined Z+stencil, not separate buffers.
 621  */
 622 static void
 623 st_validate_framebuffer(struct gl_context *ctx, struct gl_framebuffer *fb)
 624 {
 625    struct st_context *st = st_context(ctx);
 626    struct pipe_screen *screen = st->pipe->screen;
 627    const struct gl_renderbuffer_attachment *depth =
 628          &fb->Attachment[BUFFER_DEPTH];
 629    const struct gl_renderbuffer_attachment *stencil =
 630          &fb->Attachment[BUFFER_STENCIL];
 631    GLuint i;
 632    enum pipe_format first_format = PIPE_FORMAT_NONE;
 633    boolean mixed_formats =
 634          screen->get_param(screen, PIPE_CAP_MIXED_COLORBUFFER_FORMATS) != 0;
 635
 636    if (depth->Type && stencil->Type && depth->Type != stencil->Type) {
 637       st_fbo_invalid("Different Depth/Stencil buffer formats");
 638       fb->_Status = GL_FRAMEBUFFER_UNSUPPORTED_EXT;
 639       return;
 640    }
 641    if (depth->Type == GL_RENDERBUFFER_EXT &&
 642        stencil->Type == GL_RENDERBUFFER_EXT &&
 643        depth->Renderbuffer != stencil->Renderbuffer) {
 644       st_fbo_invalid("Separate Depth/Stencil buffers");
 645       fb->_Status = GL_FRAMEBUFFER_UNSUPPORTED_EXT;
 646       return;
 647    }
 648    if (depth->Type == GL_TEXTURE &&
 649        stencil->Type == GL_TEXTURE &&
 650        depth->Texture != stencil->Texture) {
 651       fb->_Status = GL_FRAMEBUFFER_UNSUPPORTED_EXT;
 652       st_fbo_invalid("Different Depth/Stencil textures");
 653       return;
 654    }
 655
 656    if (!st_validate_attachment(ctx, screen, depth, PIPE_BIND_DEPTH_STENCIL)) {
 657       fb->_Status = GL_FRAMEBUFFER_UNSUPPORTED_EXT;
 658       st_fbo_invalid("Invalid depth attachment");
 659       return;
 660    }
 661    if (!st_validate_attachment(ctx, screen, stencil, PIPE_BIND_DEPTH_STENCIL)) {
 662       fb->_Status = GL_FRAMEBUFFER_UNSUPPORTED_EXT;
 663       st_fbo_invalid("Invalid stencil attachment");
 664       return;
 665    }
 666    for (i = 0; i < ctx->Const.MaxColorAttachments; i++) {
 667       struct gl_renderbuffer_attachment *att =
 668             &fb->Attachment[BUFFER_COLOR0 + i];
 669       enum pipe_format format;
 670
 671       if (!st_validate_attachment(ctx, screen, att, PIPE_BIND_RENDER_TARGET)) {
 672          fb->_Status = GL_FRAMEBUFFER_UNSUPPORTED_EXT;
 673          st_fbo_invalid("Invalid color attachment");
 674          return;
 675       }
 676
 677       if (!mixed_formats) {
 678          /* Disallow mixed formats. */
 679          if (att->Type != GL_NONE) {
 680             format = st_renderbuffer(att->Renderbuffer)->surface->format;
 681          } else {
 682             continue;
 683          }
 684
 685          if (first_format == PIPE_FORMAT_NONE) {
 686             first_format = format;
 687          } else if (format != first_format) {
 688             fb->_Status = GL_FRAMEBUFFER_UNSUPPORTED_EXT;
 689             st_fbo_invalid("Mixed color formats");
 690             return;
 691          }
 692       }
 693    }
 694 }
 695
 696
 697 /**
 698  * Called via glDrawBuffer.  We only provide this driver function so that we
 699  * can check if we need to allocate a new renderbuffer.  Specifically, we
 700  * don't usually allocate a front color buffer when using a double-buffered
 701  * visual.  But if the app calls glDrawBuffer(GL_FRONT) we need to allocate
 702  * that buffer.  Note, this is only for window system buffers, not user-
 703  * created FBOs.
 704  */
 705 static void
 706 st_DrawBuffers(struct gl_context *ctx, GLsizei count, const GLenum *buffers)
 707 {
 708    struct st_context *st = st_context(ctx);
 709    struct gl_framebuffer *fb = ctx->DrawBuffer;
 710
 711    (void) count;
 712    (void) buffers;
 713
 714    if (_mesa_is_winsys_fbo(fb)) {
 715       GLuint i;
 716       /* add the renderbuffers on demand */
 717       for (i = 0; i < fb->_NumColorDrawBuffers; i++) {
 718          GLint idx = fb->_ColorDrawBufferIndexes[i];
 719
 720          if (idx >= 0) {
 721             st_manager_add_color_renderbuffer(st, fb, idx);
 722          }
 723       }
 724    }
 725 }
 726
 727
 728 /**
 729  * Called via glReadBuffer.  As with st_DrawBuffers, we use this function
 730  * to check if we need to allocate a renderbuffer on demand.
 731  */
 732 static void
 733 st_ReadBuffer(struct gl_context *ctx, GLenum buffer)
 734 {
 735    struct st_context *st = st_context(ctx);
 736    struct gl_framebuffer *fb = ctx->ReadBuffer;
 737
 738    (void) buffer;
 739
 740    /* Check if we need to allocate a front color buffer.
 741     * Front buffers are often allocated on demand (other color buffers are
 742     * always allocated in advance).
 743     */
 744    if ((fb->_ColorReadBufferIndex == BUFFER_FRONT_LEFT ||
 745         fb->_ColorReadBufferIndex == BUFFER_FRONT_RIGHT) &&
 746        fb->Attachment[fb->_ColorReadBufferIndex].Type == GL_NONE) {
 747       assert(_mesa_is_winsys_fbo(fb));
 748       /* add the buffer */
 749       st_manager_add_color_renderbuffer(st, fb, fb->_ColorReadBufferIndex);
 750       _mesa_update_state(ctx);
 751       st_validate_state(st, ST_PIPELINE_UPDATE_FRAMEBUFFER);
 752    }
 753 }
 754
 755
 756
 757 /**
 758  * Called via ctx->Driver.MapRenderbuffer.
 759  */
 760 static void
 761 st_MapRenderbuffer(struct gl_context *ctx,
 762                    struct gl_renderbuffer *rb,
 763                    GLuint x, GLuint y, GLuint w, GLuint h,
 764                    GLbitfield mode,
 765                    GLubyte **mapOut, GLint *rowStrideOut)
 766 {
 767    struct st_context *st = st_context(ctx);
 768    struct st_renderbuffer *strb = st_renderbuffer(rb);
 769    struct pipe_context *pipe = st->pipe;
 770    const GLboolean invert = rb->Name == 0;
 771    unsigned usage;
 772    GLuint y2;
 773    GLubyte *map;
 774
 775    if (strb->software) {
 776       /* software-allocated renderbuffer (probably an accum buffer) */
 777       if (strb->data) {
 778          GLint bpp = _mesa_get_format_bytes(strb->Base.Format);
 779          GLint stride = _mesa_format_row_stride(strb->Base.Format,
 780                                                 strb->Base.Width);
 781          *mapOut = (GLubyte *) strb->data + y * stride + x * bpp;
 782          *rowStrideOut = stride;
 783       }
 784       else {
 785          *mapOut = NULL;
 786          *rowStrideOut = 0;
 787       }
 788       return;
 789    }
 790
 791    usage = 0x0;
 792    if (mode & GL_MAP_READ_BIT)
 793       usage |= PIPE_TRANSFER_READ;
 794    if (mode & GL_MAP_WRITE_BIT)
 795       usage |= PIPE_TRANSFER_WRITE;
 796    if (mode & GL_MAP_INVALIDATE_RANGE_BIT)
 797       usage |= PIPE_TRANSFER_DISCARD_RANGE;
 798
 799    /* Note: y=0=bottom of buffer while y2=0=top of buffer.
 800     * 'invert' will be true for window-system buffers and false for
 801     * user-allocated renderbuffers and textures.
 802     */
 803    if (invert)
 804       y2 = strb->Base.Height - y - h;
 805    else
 806       y2 = y;
 807
 808     map = pipe_transfer_map(pipe,
 809                             strb->texture,
 810                             strb->surface->u.tex.level,
 811                             strb->surface->u.tex.first_layer,
 812                             usage, x, y2, w, h, &strb->transfer);
 813    if (map) {
 814       if (invert) {
 815          *rowStrideOut = -(int) strb->transfer->stride;
 816          map += (h - 1) * strb->transfer->stride;
 817       }
 818       else {
 819          *rowStrideOut = strb->transfer->stride;
 820       }
 821       *mapOut = map;
 822    }
 823    else {
 824       *mapOut = NULL;
 825       *rowStrideOut = 0;
 826    }
 827 }
 828
 829
 830 /**
 831  * Called via ctx->Driver.UnmapRenderbuffer.
 832  */
 833 static void
 834 st_UnmapRenderbuffer(struct gl_context *ctx,
 835                      struct gl_renderbuffer *rb)
 836 {
 837    struct st_context *st = st_context(ctx);
 838    struct st_renderbuffer *strb = st_renderbuffer(rb);
 839    struct pipe_context *pipe = st->pipe;
 840
 841    if (strb->software) {
 842       /* software-allocated renderbuffer (probably an accum buffer) */
 843       return;
 844    }
 845
 846    pipe_transfer_unmap(pipe, strb->transfer);
 847    strb->transfer = NULL;
 848 }
 849
 850
 851
 852 void
 853 st_init_fbo_functions(struct dd_function_table *functions)
 854 {
 855    functions->NewFramebuffer = _mesa_new_framebuffer;
 856    functions->NewRenderbuffer = st_new_renderbuffer;
 857    functions->FramebufferRenderbuffer = _mesa_FramebufferRenderbuffer_sw;
 858    functions->RenderTexture = st_render_texture;
 859    functions->FinishRenderTexture = st_finish_render_texture;
 860    functions->ValidateFramebuffer = st_validate_framebuffer;
 861
 862    functions->DrawBuffers = st_DrawBuffers;
 863    functions->ReadBuffer = st_ReadBuffer;
 864
 865    functions->MapRenderbuffer = st_MapRenderbuffer;
 866    functions->UnmapRenderbuffer = st_UnmapRenderbuffer;
 867 }