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_bufferobjects.h"
  51 #include "st_cb_fbo.h"
  52 #include "st_cb_flush.h"
  53 #include "st_cb_texture.h"
  54 #include "st_format.h"
  55 #include "st_texture.h"
  56 #include "st_util.h"
  57 #include "st_manager.h"
  58
  59 #include "util/format/u_format.h"
  60 #include "util/u_inlines.h"
  61 #include "util/u_surface.h"
  62
  63
  64 static GLboolean
  65 st_renderbuffer_alloc_sw_storage(struct gl_context * ctx,
  66                                  struct gl_renderbuffer *rb,
  67                                  GLenum internalFormat,
  68                                  GLuint width, GLuint height)
  69 {
  70    struct st_context *st = st_context(ctx);
  71    struct st_renderbuffer *strb = st_renderbuffer(rb);
  72    enum pipe_format format;
  73    size_t size;
  74
  75    free(strb->data);
  76    strb->data = NULL;
  77
  78    if (internalFormat == GL_RGBA16_SNORM) {
  79       /* Special case for software accum buffers.  Otherwise, if the
  80        * call to st_choose_renderbuffer_format() fails (because the
  81        * driver doesn't support signed 16-bit/channel colors) we'd
  82        * just return without allocating the software accum buffer.
  83        */
  84       format = PIPE_FORMAT_R16G16B16A16_SNORM;
  85    }
  86    else {
  87       format = st_choose_renderbuffer_format(st, internalFormat, 0, 0);
  88
  89       /* Not setting gl_renderbuffer::Format here will cause
  90        * FRAMEBUFFER_UNSUPPORTED and ValidateFramebuffer will not be called.
  91        */
  92       if (format == PIPE_FORMAT_NONE) {
  93          return GL_TRUE;
  94       }
  95    }
  96
  97    strb->Base.Format = st_pipe_format_to_mesa_format(format);
  98
  99    size = _mesa_format_image_size(strb->Base.Format, width, height, 1);
 100    strb->data = malloc(size);
 101    return strb->data != NULL;
 102 }
 103
 104
 105 /**
 106  * gl_renderbuffer::AllocStorage()
 107  * This is called to allocate the original drawing surface, and
 108  * during window resize.
 109  */
 110 static GLboolean
 111 st_renderbuffer_alloc_storage(struct gl_context * ctx,
 112                               struct gl_renderbuffer *rb,
 113                               GLenum internalFormat,
 114                               GLuint width, GLuint height)
 115 {
 116    struct st_context *st = st_context(ctx);
 117    struct pipe_screen *screen = st->pipe->screen;
 118    struct st_renderbuffer *strb = st_renderbuffer(rb);
 119    enum pipe_format format = PIPE_FORMAT_NONE;
 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_srgb, NULL);
 136    pipe_surface_reference(&strb->surface_linear, NULL);
 137    strb->surface = NULL;
 138    pipe_resource_reference(&strb->texture, NULL);
 139
 140    /* If an sRGB framebuffer is unsupported, sRGB formats behave like linear
 141     * formats.
 142     */
 143    if (!ctx->Extensions.EXT_sRGB) {
 144       internalFormat = _mesa_get_linear_internalformat(internalFormat);
 145    }
 146
 147    /* Handle multisample renderbuffers first.
 148     *
 149     * From ARB_framebuffer_object:
 150     *   If <samples> is zero, then RENDERBUFFER_SAMPLES is set to zero.
 151     *   Otherwise <samples> represents a request for a desired minimum
 152     *   number of samples. Since different implementations may support
 153     *   different sample counts for multisampled rendering, the actual
 154     *   number of samples allocated for the renderbuffer image is
 155     *   implementation dependent.  However, the resulting value for
 156     *   RENDERBUFFER_SAMPLES is guaranteed to be greater than or equal
 157     *   to <samples> and no more than the next larger sample count supported
 158     *   by the implementation.
 159     *
 160     * Find the supported number of samples >= rb->NumSamples
 161     */
 162    if (rb->NumSamples > 0) {
 163       unsigned start, start_storage;
 164
 165       if (ctx->Const.MaxSamples > 1 &&  rb->NumSamples == 1) {
 166          /* don't try num_samples = 1 with drivers that support real msaa */
 167          start = 2;
 168          start_storage = 2;
 169       } else {
 170          start = rb->NumSamples;
 171          start_storage = rb->NumStorageSamples;
 172       }
 173
 174       if (ctx->Extensions.AMD_framebuffer_multisample_advanced) {
 175          if (rb->_BaseFormat == GL_DEPTH_COMPONENT ||
 176              rb->_BaseFormat == GL_DEPTH_STENCIL ||
 177              rb->_BaseFormat == GL_STENCIL_INDEX) {
 178             /* Find a supported depth-stencil format. */
 179             for (unsigned samples = start;
 180                  samples <= ctx->Const.MaxDepthStencilFramebufferSamples;
 181                  samples++) {
 182                format = st_choose_renderbuffer_format(st, internalFormat,
 183                                                       samples, samples);
 184
 185                if (format != PIPE_FORMAT_NONE) {
 186                   rb->NumSamples = samples;
 187                   rb->NumStorageSamples = samples;
 188                   break;
 189                }
 190             }
 191          } else {
 192             /* Find a supported color format, samples >= storage_samples. */
 193             for (unsigned storage_samples = start_storage;
 194                  storage_samples <= ctx->Const.MaxColorFramebufferStorageSamples;
 195                  storage_samples++) {
 196                for (unsigned samples = MAX2(start, storage_samples);
 197                     samples <= ctx->Const.MaxColorFramebufferSamples;
 198                     samples++) {
 199                   format = st_choose_renderbuffer_format(st, internalFormat,
 200                                                          samples,
 201                                                          storage_samples);
 202
 203                   if (format != PIPE_FORMAT_NONE) {
 204                      rb->NumSamples = samples;
 205                      rb->NumStorageSamples = storage_samples;
 206                      goto found;
 207                   }
 208                }
 209             }
 210             found:;
 211          }
 212       } else {
 213          for (unsigned samples = start; samples <= ctx->Const.MaxSamples;
 214               samples++) {
 215             format = st_choose_renderbuffer_format(st, internalFormat,
 216                                                    samples, samples);
 217
 218             if (format != PIPE_FORMAT_NONE) {
 219                rb->NumSamples = samples;
 220                rb->NumStorageSamples = samples;
 221                break;
 222             }
 223          }
 224       }
 225    } else {
 226       format = st_choose_renderbuffer_format(st, internalFormat, 0, 0);
 227    }
 228
 229    /* Not setting gl_renderbuffer::Format here will cause
 230     * FRAMEBUFFER_UNSUPPORTED and ValidateFramebuffer will not be called.
 231     */
 232    if (format == PIPE_FORMAT_NONE) {
 233       return GL_TRUE;
 234    }
 235
 236    strb->Base.Format = st_pipe_format_to_mesa_format(format);
 237
 238    if (width == 0 || height == 0) {
 239       /* if size is zero, nothing to allocate */
 240       return GL_TRUE;
 241    }
 242
 243    /* Setup new texture template.
 244     */
 245    memset(&templ, 0, sizeof(templ));
 246    templ.target = st->internal_target;
 247    templ.format = format;
 248    templ.width0 = width;
 249    templ.height0 = height;
 250    templ.depth0 = 1;
 251    templ.array_size = 1;
 252    templ.nr_samples = rb->NumSamples;
 253    templ.nr_storage_samples = rb->NumStorageSamples;
 254
 255    if (util_format_is_depth_or_stencil(format)) {
 256       templ.bind = PIPE_BIND_DEPTH_STENCIL;
 257    }
 258    else if (strb->Base.Name != 0) {
 259       /* this is a user-created renderbuffer */
 260       templ.bind = PIPE_BIND_RENDER_TARGET;
 261    }
 262    else {
 263       /* this is a window-system buffer */
 264       templ.bind = (PIPE_BIND_DISPLAY_TARGET |
 265                     PIPE_BIND_RENDER_TARGET);
 266    }
 267
 268    strb->texture = screen->resource_create(screen, &templ);
 269
 270    if (!strb->texture)
 271       return FALSE;
 272
 273    st_update_renderbuffer_surface(st, strb);
 274    return strb->surface != NULL;
 275 }
 276
 277
 278 /**
 279  * gl_renderbuffer::Delete()
 280  */
 281 static void
 282 st_renderbuffer_delete(struct gl_context *ctx, struct gl_renderbuffer *rb)
 283 {
 284    struct st_renderbuffer *strb = st_renderbuffer(rb);
 285    if (ctx) {
 286       struct st_context *st = st_context(ctx);
 287       pipe_surface_release(st->pipe, &strb->surface_srgb);
 288       pipe_surface_release(st->pipe, &strb->surface_linear);
 289    } else {
 290       pipe_surface_release_no_context(&strb->surface_srgb);
 291       pipe_surface_release_no_context(&strb->surface_linear);
 292    }
 293    strb->surface = NULL;
 294    pipe_resource_reference(&strb->texture, NULL);
 295    free(strb->data);
 296    _mesa_delete_renderbuffer(ctx, rb);
 297 }
 298
 299
 300 /**
 301  * Called via ctx->Driver.NewRenderbuffer()
 302  */
 303 static struct gl_renderbuffer *
 304 st_new_renderbuffer(struct gl_context *ctx, GLuint name)
 305 {
 306    struct st_renderbuffer *strb = ST_CALLOC_STRUCT(st_renderbuffer);
 307    if (strb) {
 308       assert(name != 0);
 309       _mesa_init_renderbuffer(&strb->Base, name);
 310       strb->Base.Delete = st_renderbuffer_delete;
 311       strb->Base.AllocStorage = st_renderbuffer_alloc_storage;
 312       return &strb->Base;
 313    }
 314    return NULL;
 315 }
 316
 317
 318 /**
 319  * Allocate a renderbuffer for an on-screen window (not a user-created
 320  * renderbuffer).  The window system code determines the format.
 321  */
 322 struct gl_renderbuffer *
 323 st_new_renderbuffer_fb(enum pipe_format format, unsigned samples, boolean sw)
 324 {
 325    struct st_renderbuffer *strb;
 326
 327    strb = ST_CALLOC_STRUCT(st_renderbuffer);
 328    if (!strb) {
 329       _mesa_error(NULL, GL_OUT_OF_MEMORY, "creating renderbuffer");
 330       return NULL;
 331    }
 332
 333    _mesa_init_renderbuffer(&strb->Base, 0);
 334    strb->Base.ClassID = 0x4242; /* just a unique value */
 335    strb->Base.NumSamples = samples;
 336    strb->Base.NumStorageSamples = samples;
 337    strb->Base.Format = st_pipe_format_to_mesa_format(format);
 338    strb->Base._BaseFormat = _mesa_get_format_base_format(strb->Base.Format);
 339    strb->software = sw;
 340
 341    switch (format) {
 342    case PIPE_FORMAT_B10G10R10A2_UNORM:
 343    case PIPE_FORMAT_R10G10B10A2_UNORM:
 344       strb->Base.InternalFormat = GL_RGB10_A2;
 345       break;
 346    case PIPE_FORMAT_R10G10B10X2_UNORM:
 347    case PIPE_FORMAT_B10G10R10X2_UNORM:
 348       strb->Base.InternalFormat = GL_RGB10;
 349       break;
 350    case PIPE_FORMAT_R8G8B8A8_UNORM:
 351    case PIPE_FORMAT_B8G8R8A8_UNORM:
 352    case PIPE_FORMAT_A8R8G8B8_UNORM:
 353       strb->Base.InternalFormat = GL_RGBA8;
 354       break;
 355    case PIPE_FORMAT_R8G8B8X8_UNORM:
 356    case PIPE_FORMAT_B8G8R8X8_UNORM:
 357    case PIPE_FORMAT_X8R8G8B8_UNORM:
 358       strb->Base.InternalFormat = GL_RGB8;
 359       break;
 360    case PIPE_FORMAT_R8G8B8A8_SRGB:
 361    case PIPE_FORMAT_B8G8R8A8_SRGB:
 362    case PIPE_FORMAT_A8R8G8B8_SRGB:
 363       strb->Base.InternalFormat = GL_SRGB8_ALPHA8;
 364       break;
 365    case PIPE_FORMAT_R8G8B8X8_SRGB:
 366    case PIPE_FORMAT_B8G8R8X8_SRGB:
 367    case PIPE_FORMAT_X8R8G8B8_SRGB:
 368       strb->Base.InternalFormat = GL_SRGB8;
 369       break;
 370    case PIPE_FORMAT_B5G5R5A1_UNORM:
 371       strb->Base.InternalFormat = GL_RGB5_A1;
 372       break;
 373    case PIPE_FORMAT_B4G4R4A4_UNORM:
 374       strb->Base.InternalFormat = GL_RGBA4;
 375       break;
 376    case PIPE_FORMAT_B5G6R5_UNORM:
 377       strb->Base.InternalFormat = GL_RGB565;
 378       break;
 379    case PIPE_FORMAT_Z16_UNORM:
 380       strb->Base.InternalFormat = GL_DEPTH_COMPONENT16;
 381       break;
 382    case PIPE_FORMAT_Z32_UNORM:
 383       strb->Base.InternalFormat = GL_DEPTH_COMPONENT32;
 384       break;
 385    case PIPE_FORMAT_Z24_UNORM_S8_UINT:
 386    case PIPE_FORMAT_S8_UINT_Z24_UNORM:
 387       strb->Base.InternalFormat = GL_DEPTH24_STENCIL8_EXT;
 388       break;
 389    case PIPE_FORMAT_Z24X8_UNORM:
 390    case PIPE_FORMAT_X8Z24_UNORM:
 391       strb->Base.InternalFormat = GL_DEPTH_COMPONENT24;
 392       break;
 393    case PIPE_FORMAT_S8_UINT:
 394       strb->Base.InternalFormat = GL_STENCIL_INDEX8_EXT;
 395       break;
 396    case PIPE_FORMAT_R16G16B16A16_SNORM:
 397       /* accum buffer */
 398       strb->Base.InternalFormat = GL_RGBA16_SNORM;
 399       break;
 400    case PIPE_FORMAT_R16G16B16A16_UNORM:
 401       strb->Base.InternalFormat = GL_RGBA16;
 402       break;
 403    case PIPE_FORMAT_R8_UNORM:
 404       strb->Base.InternalFormat = GL_R8;
 405       break;
 406    case PIPE_FORMAT_R8G8_UNORM:
 407       strb->Base.InternalFormat = GL_RG8;
 408       break;
 409    case PIPE_FORMAT_R16_UNORM:
 410       strb->Base.InternalFormat = GL_R16;
 411       break;
 412    case PIPE_FORMAT_R16G16_UNORM:
 413       strb->Base.InternalFormat = GL_RG16;
 414       break;
 415    case PIPE_FORMAT_R32G32B32A32_FLOAT:
 416       strb->Base.InternalFormat = GL_RGBA32F;
 417       break;
 418    case PIPE_FORMAT_R32G32B32X32_FLOAT:
 419       strb->Base.InternalFormat = GL_RGB32F;
 420       break;
 421    case PIPE_FORMAT_R16G16B16A16_FLOAT:
 422       strb->Base.InternalFormat = GL_RGBA16F;
 423       break;
 424    case PIPE_FORMAT_R16G16B16X16_FLOAT:
 425       strb->Base.InternalFormat = GL_RGB16F;
 426       break;
 427    default:
 428       _mesa_problem(NULL,
 429                     "Unexpected format %s in st_new_renderbuffer_fb",
 430                     util_format_name(format));
 431       free(strb);
 432       return NULL;
 433    }
 434
 435    /* st-specific methods */
 436    strb->Base.Delete = st_renderbuffer_delete;
 437    strb->Base.AllocStorage = st_renderbuffer_alloc_storage;
 438
 439    /* surface is allocated in st_renderbuffer_alloc_storage() */
 440    strb->surface = NULL;
 441
 442    return &strb->Base;
 443 }
 444
 445
 446 /**
 447  * Create or update the pipe_surface of a FBO renderbuffer.
 448  * This is usually called after st_finalize_texture.
 449  */
 450 void
 451 st_update_renderbuffer_surface(struct st_context *st,
 452                                struct st_renderbuffer *strb)
 453 {
 454    struct pipe_context *pipe = st->pipe;
 455    struct pipe_resource *resource = strb->texture;
 456    const struct st_texture_object *stTexObj = NULL;
 457    unsigned rtt_width = strb->Base.Width;
 458    unsigned rtt_height = strb->Base.Height;
 459    unsigned rtt_depth = strb->Base.Depth;
 460
 461    /*
 462     * For winsys fbo, it is possible that the renderbuffer is sRGB-capable but
 463     * the format of strb->texture is linear (because we have no control over
 464     * the format).  Check strb->Base.Format instead of strb->texture->format
 465     * to determine if the rb is sRGB-capable.
 466     */
 467    boolean enable_srgb = st->ctx->Color.sRGBEnabled &&
 468       _mesa_is_format_srgb(strb->Base.Format);
 469    enum pipe_format format = resource->format;
 470
 471    if (strb->is_rtt) {
 472       stTexObj = st_texture_object(strb->Base.TexImage->TexObject);
 473       if (stTexObj->surface_based)
 474          format = stTexObj->surface_format;
 475    }
 476
 477    format = enable_srgb ? util_format_srgb(format) : util_format_linear(format);
 478
 479    if (resource->target == PIPE_TEXTURE_1D_ARRAY) {
 480       rtt_depth = rtt_height;
 481       rtt_height = 1;
 482    }
 483
 484    /* find matching mipmap level size */
 485    unsigned level;
 486    for (level = 0; level <= resource->last_level; level++) {
 487       if (u_minify(resource->width0, level) == rtt_width &&
 488           u_minify(resource->height0, level) == rtt_height &&
 489           (resource->target != PIPE_TEXTURE_3D ||
 490            u_minify(resource->depth0, level) == rtt_depth)) {
 491          break;
 492       }
 493    }
 494    assert(level <= resource->last_level);
 495
 496    /* determine the layer bounds */
 497    unsigned first_layer, last_layer;
 498    if (strb->rtt_layered) {
 499       first_layer = 0;
 500       last_layer = util_max_layer(strb->texture, level);
 501    }
 502    else {
 503       first_layer =
 504       last_layer = strb->rtt_face + strb->rtt_slice;
 505    }
 506
 507    /* Adjust for texture views */
 508    if (strb->is_rtt && resource->array_size > 1 &&
 509        stTexObj->base.Immutable) {
 510       const struct gl_texture_object *tex = &stTexObj->base;
 511       first_layer += tex->MinLayer;
 512       if (!strb->rtt_layered)
 513          last_layer += tex->MinLayer;
 514       else
 515          last_layer = MIN2(first_layer + tex->NumLayers - 1, last_layer);
 516    }
 517
 518    struct pipe_surface **psurf =
 519       enable_srgb ? &strb->surface_srgb : &strb->surface_linear;
 520    struct pipe_surface *surf = *psurf;
 521
 522    if (!surf ||
 523        surf->texture->nr_samples != strb->Base.NumSamples ||
 524        surf->texture->nr_storage_samples != strb->Base.NumStorageSamples ||
 525        surf->format != format ||
 526        surf->texture != resource ||
 527        surf->width != rtt_width ||
 528        surf->height != rtt_height ||
 529        surf->nr_samples != strb->rtt_nr_samples ||
 530        surf->u.tex.level != level ||
 531        surf->u.tex.first_layer != first_layer ||
 532        surf->u.tex.last_layer != last_layer) {
 533       /* create a new pipe_surface */
 534       struct pipe_surface surf_tmpl;
 535       memset(&surf_tmpl, 0, sizeof(surf_tmpl));
 536       surf_tmpl.format = format;
 537       surf_tmpl.nr_samples = strb->rtt_nr_samples;
 538       surf_tmpl.u.tex.level = level;
 539       surf_tmpl.u.tex.first_layer = first_layer;
 540       surf_tmpl.u.tex.last_layer = last_layer;
 541
 542       pipe_surface_release(pipe, psurf);
 543
 544       *psurf = pipe->create_surface(pipe, resource, &surf_tmpl);
 545    }
 546    strb->surface = *psurf;
 547 }
 548
 549
 550 /**
 551  * Return the pipe_resource which stores a particular texture image.
 552  */
 553 static struct pipe_resource *
 554 get_teximage_resource(struct gl_texture_object *texObj,
 555                       unsigned face, unsigned level)
 556 {
 557    struct st_texture_image *stImg =
 558       st_texture_image(texObj->Image[face][level]);
 559
 560    return stImg->pt;
 561 }
 562
 563
 564 /**
 565  * Called by ctx->Driver.RenderTexture
 566  */
 567 static void
 568 st_render_texture(struct gl_context *ctx,
 569                   struct gl_framebuffer *fb,
 570                   struct gl_renderbuffer_attachment *att)
 571 {
 572    struct st_context *st = st_context(ctx);
 573    struct gl_renderbuffer *rb = att->Renderbuffer;
 574    struct st_renderbuffer *strb = st_renderbuffer(rb);
 575    struct pipe_resource *pt;
 576
 577    pt = get_teximage_resource(att->Texture,
 578                               att->CubeMapFace,
 579                               att->TextureLevel);
 580    assert(pt);
 581
 582    /* point renderbuffer at texobject */
 583    strb->is_rtt = TRUE;
 584    strb->rtt_face = att->CubeMapFace;
 585    strb->rtt_slice = att->Zoffset;
 586    strb->rtt_layered = att->Layered;
 587    strb->rtt_nr_samples = att->NumSamples;
 588    pipe_resource_reference(&strb->texture, pt);
 589
 590    st_update_renderbuffer_surface(st, strb);
 591
 592    /* Invalidate buffer state so that the pipe's framebuffer state
 593     * gets updated.
 594     * That's where the new renderbuffer (which we just created) gets
 595     * passed to the pipe as a (color/depth) render target.
 596     */
 597    st_invalidate_buffers(st);
 598
 599
 600    /* Need to trigger a call to update_framebuffer() since we just
 601     * attached a new renderbuffer.
 602     */
 603    ctx->NewState |= _NEW_BUFFERS;
 604 }
 605
 606
 607 /**
 608  * Called via ctx->Driver.FinishRenderTexture.
 609  */
 610 static void
 611 st_finish_render_texture(struct gl_context *ctx, struct gl_renderbuffer *rb)
 612 {
 613    struct st_context *st = st_context(ctx);
 614    struct st_renderbuffer *strb = st_renderbuffer(rb);
 615
 616    if (!strb)
 617       return;
 618
 619    strb->is_rtt = FALSE;
 620
 621    /* restore previous framebuffer state */
 622    st_invalidate_buffers(st);
 623 }
 624
 625
 626 /** Debug helper */
 627 static void
 628 st_fbo_invalid(const char *reason)
 629 {
 630    if (MESA_DEBUG_FLAGS & DEBUG_INCOMPLETE_FBO) {
 631       _mesa_debug(NULL, "Invalid FBO: %s\n", reason);
 632    }
 633 }
 634
 635
 636 /**
 637  * Validate a renderbuffer attachment for a particular set of bindings.
 638  */
 639 static GLboolean
 640 st_validate_attachment(struct gl_context *ctx,
 641                        struct pipe_screen *screen,
 642                        const struct gl_renderbuffer_attachment *att,
 643                        unsigned bindings)
 644 {
 645    const struct st_texture_object *stObj = st_texture_object(att->Texture);
 646    enum pipe_format format;
 647    mesa_format texFormat;
 648    GLboolean valid;
 649
 650    /* Sanity check: we must be binding the surface as a (color) render target
 651     * or depth/stencil target.
 652     */
 653    assert(bindings == PIPE_BIND_RENDER_TARGET ||
 654           bindings == PIPE_BIND_DEPTH_STENCIL);
 655
 656    /* Only validate texture attachments for now, since
 657     * st_renderbuffer_alloc_storage makes sure that
 658     * the format is supported.
 659     */
 660    if (att->Type != GL_TEXTURE)
 661       return GL_TRUE;
 662
 663    if (!stObj || !stObj->pt)
 664       return GL_FALSE;
 665
 666    format = stObj->pt->format;
 667    texFormat = att->Renderbuffer->TexImage->TexFormat;
 668
 669    /* If the encoding is sRGB and sRGB rendering cannot be enabled,
 670     * check for linear format support instead.
 671     * Later when we create a surface, we change the format to a linear one. */
 672    if (!ctx->Extensions.EXT_sRGB && _mesa_is_format_srgb(texFormat)) {
 673       const mesa_format linearFormat = _mesa_get_srgb_format_linear(texFormat);
 674       format = st_mesa_format_to_pipe_format(st_context(ctx), linearFormat);
 675    }
 676
 677    valid = screen->is_format_supported(screen, format,
 678                                        PIPE_TEXTURE_2D,
 679                                        stObj->pt->nr_samples,
 680                                        stObj->pt->nr_storage_samples,
 681                                        bindings);
 682    if (!valid) {
 683       st_fbo_invalid("Invalid format");
 684    }
 685
 686    return valid;
 687 }
 688
 689
 690 /**
 691  * Check that the framebuffer configuration is valid in terms of what
 692  * the driver can support.
 693  *
 694  * For Gallium we only supports combined Z+stencil, not separate buffers.
 695  */
 696 static void
 697 st_validate_framebuffer(struct gl_context *ctx, struct gl_framebuffer *fb)
 698 {
 699    struct st_context *st = st_context(ctx);
 700    struct pipe_screen *screen = st->pipe->screen;
 701    const struct gl_renderbuffer_attachment *depth =
 702          &fb->Attachment[BUFFER_DEPTH];
 703    const struct gl_renderbuffer_attachment *stencil =
 704          &fb->Attachment[BUFFER_STENCIL];
 705    GLuint i;
 706    enum pipe_format first_format = PIPE_FORMAT_NONE;
 707    boolean mixed_formats =
 708          screen->get_param(screen, PIPE_CAP_MIXED_COLORBUFFER_FORMATS) != 0;
 709
 710    if (depth->Type && stencil->Type && depth->Type != stencil->Type) {
 711       st_fbo_invalid("Different Depth/Stencil buffer formats");
 712       fb->_Status = GL_FRAMEBUFFER_UNSUPPORTED_EXT;
 713       return;
 714    }
 715    if (depth->Type == GL_RENDERBUFFER_EXT &&
 716        stencil->Type == GL_RENDERBUFFER_EXT &&
 717        depth->Renderbuffer != stencil->Renderbuffer) {
 718       st_fbo_invalid("Separate Depth/Stencil buffers");
 719       fb->_Status = GL_FRAMEBUFFER_UNSUPPORTED_EXT;
 720       return;
 721    }
 722    if (depth->Type == GL_TEXTURE &&
 723        stencil->Type == GL_TEXTURE &&
 724        depth->Texture != stencil->Texture) {
 725       fb->_Status = GL_FRAMEBUFFER_UNSUPPORTED_EXT;
 726       st_fbo_invalid("Different Depth/Stencil textures");
 727       return;
 728    }
 729
 730    if (!st_validate_attachment(ctx, screen, depth, PIPE_BIND_DEPTH_STENCIL)) {
 731       fb->_Status = GL_FRAMEBUFFER_UNSUPPORTED_EXT;
 732       st_fbo_invalid("Invalid depth attachment");
 733       return;
 734    }
 735    if (!st_validate_attachment(ctx, screen, stencil, PIPE_BIND_DEPTH_STENCIL)) {
 736       fb->_Status = GL_FRAMEBUFFER_UNSUPPORTED_EXT;
 737       st_fbo_invalid("Invalid stencil attachment");
 738       return;
 739    }
 740    for (i = 0; i < ctx->Const.MaxColorAttachments; i++) {
 741       struct gl_renderbuffer_attachment *att =
 742             &fb->Attachment[BUFFER_COLOR0 + i];
 743       enum pipe_format format;
 744
 745       if (!st_validate_attachment(ctx, screen, att, PIPE_BIND_RENDER_TARGET)) {
 746          fb->_Status = GL_FRAMEBUFFER_UNSUPPORTED_EXT;
 747          st_fbo_invalid("Invalid color attachment");
 748          return;
 749       }
 750
 751       if (!mixed_formats) {
 752          /* Disallow mixed formats. */
 753          if (att->Type != GL_NONE) {
 754             format = st_renderbuffer(att->Renderbuffer)->surface->format;
 755          } else {
 756             continue;
 757          }
 758
 759          if (first_format == PIPE_FORMAT_NONE) {
 760             first_format = format;
 761          } else if (format != first_format) {
 762             fb->_Status = GL_FRAMEBUFFER_UNSUPPORTED_EXT;
 763             st_fbo_invalid("Mixed color formats");
 764             return;
 765          }
 766       }
 767    }
 768 }
 769
 770
 771 /**
 772  * Called by ctx->Driver.DiscardFramebuffer
 773  */
 774 static void
 775 st_discard_framebuffer(struct gl_context *ctx, struct gl_framebuffer *fb,
 776                        struct gl_renderbuffer_attachment *att)
 777 {
 778    struct st_context *st = st_context(ctx);
 779    struct pipe_resource *prsc;
 780
 781    if (!att->Renderbuffer || !att->Complete)
 782       return;
 783
 784    prsc = st_renderbuffer(att->Renderbuffer)->surface->texture;
 785
 786    /* using invalidate_resource will only work for simple 2D resources */
 787    if (prsc->depth0 != 1 || prsc->array_size != 1 || prsc->last_level != 0)
 788       return;
 789
 790    if (st->pipe->invalidate_resource)
 791       st->pipe->invalidate_resource(st->pipe, prsc);
 792 }
 793
 794
 795 /**
 796  * Called via glDrawBuffer.  We only provide this driver function so that we
 797  * can check if we need to allocate a new renderbuffer.  Specifically, we
 798  * don't usually allocate a front color buffer when using a double-buffered
 799  * visual.  But if the app calls glDrawBuffer(GL_FRONT) we need to allocate
 800  * that buffer.  Note, this is only for window system buffers, not user-
 801  * created FBOs.
 802  */
 803 static void
 804 st_DrawBufferAllocate(struct gl_context *ctx)
 805 {
 806    struct st_context *st = st_context(ctx);
 807    struct gl_framebuffer *fb = ctx->DrawBuffer;
 808
 809    if (_mesa_is_winsys_fbo(fb)) {
 810       GLuint i;
 811       /* add the renderbuffers on demand */
 812       for (i = 0; i < fb->_NumColorDrawBuffers; i++) {
 813          gl_buffer_index idx = fb->_ColorDrawBufferIndexes[i];
 814
 815          if (idx != BUFFER_NONE) {
 816             st_manager_add_color_renderbuffer(st, fb, idx);
 817          }
 818       }
 819    }
 820 }
 821
 822
 823 /**
 824  * Called via glReadBuffer.  As with st_DrawBufferAllocate, we use this
 825  * function to check if we need to allocate a renderbuffer on demand.
 826  */
 827 static void
 828 st_ReadBuffer(struct gl_context *ctx, GLenum buffer)
 829 {
 830    struct st_context *st = st_context(ctx);
 831    struct gl_framebuffer *fb = ctx->ReadBuffer;
 832
 833    (void) buffer;
 834
 835    /* Check if we need to allocate a front color buffer.
 836     * Front buffers are often allocated on demand (other color buffers are
 837     * always allocated in advance).
 838     */
 839    if ((fb->_ColorReadBufferIndex == BUFFER_FRONT_LEFT ||
 840         fb->_ColorReadBufferIndex == BUFFER_FRONT_RIGHT) &&
 841        fb->Attachment[fb->_ColorReadBufferIndex].Type == GL_NONE) {
 842       assert(_mesa_is_winsys_fbo(fb));
 843       /* add the buffer */
 844       st_manager_add_color_renderbuffer(st, fb, fb->_ColorReadBufferIndex);
 845       _mesa_update_state(ctx);
 846       st_validate_state(st, ST_PIPELINE_UPDATE_FRAMEBUFFER);
 847    }
 848 }
 849
 850
 851
 852 /**
 853  * Called via ctx->Driver.MapRenderbuffer.
 854  */
 855 static void
 856 st_MapRenderbuffer(struct gl_context *ctx,
 857                    struct gl_renderbuffer *rb,
 858                    GLuint x, GLuint y, GLuint w, GLuint h,
 859                    GLbitfield mode,
 860                    GLubyte **mapOut, GLint *rowStrideOut,
 861                    bool flip_y)
 862 {
 863    struct st_context *st = st_context(ctx);
 864    struct st_renderbuffer *strb = st_renderbuffer(rb);
 865    struct pipe_context *pipe = st->pipe;
 866    const GLboolean invert = flip_y;
 867    GLuint y2;
 868    GLubyte *map;
 869
 870    if (strb->software) {
 871       /* software-allocated renderbuffer (probably an accum buffer) */
 872       if (strb->data) {
 873          GLint bpp = _mesa_get_format_bytes(strb->Base.Format);
 874          GLint stride = _mesa_format_row_stride(strb->Base.Format,
 875                                                 strb->Base.Width);
 876          *mapOut = (GLubyte *) strb->data + y * stride + x * bpp;
 877          *rowStrideOut = stride;
 878       }
 879       else {
 880          *mapOut = NULL;
 881          *rowStrideOut = 0;
 882       }
 883       return;
 884    }
 885
 886    /* Check for unexpected flags */
 887    assert((mode & ~(GL_MAP_READ_BIT |
 888                     GL_MAP_WRITE_BIT |
 889                     GL_MAP_INVALIDATE_RANGE_BIT)) == 0);
 890
 891    const enum pipe_transfer_usage transfer_flags =
 892       st_access_flags_to_transfer_flags(mode, false);
 893
 894    /* Note: y=0=bottom of buffer while y2=0=top of buffer.
 895     * 'invert' will be true for window-system buffers and false for
 896     * user-allocated renderbuffers and textures.
 897     */
 898    if (invert)
 899       y2 = strb->Base.Height - y - h;
 900    else
 901       y2 = y;
 902
 903     map = pipe_transfer_map(pipe,
 904                             strb->texture,
 905                             strb->surface->u.tex.level,
 906                             strb->surface->u.tex.first_layer,
 907                             transfer_flags, x, y2, w, h, &strb->transfer);
 908    if (map) {
 909       if (invert) {
 910          *rowStrideOut = -(int) strb->transfer->stride;
 911          map += (h - 1) * strb->transfer->stride;
 912       }
 913       else {
 914          *rowStrideOut = strb->transfer->stride;
 915       }
 916       *mapOut = map;
 917    }
 918    else {
 919       *mapOut = NULL;
 920       *rowStrideOut = 0;
 921    }
 922 }
 923
 924
 925 /**
 926  * Called via ctx->Driver.UnmapRenderbuffer.
 927  */
 928 static void
 929 st_UnmapRenderbuffer(struct gl_context *ctx,
 930                      struct gl_renderbuffer *rb)
 931 {
 932    struct st_context *st = st_context(ctx);
 933    struct st_renderbuffer *strb = st_renderbuffer(rb);
 934    struct pipe_context *pipe = st->pipe;
 935
 936    if (strb->software) {
 937       /* software-allocated renderbuffer (probably an accum buffer) */
 938       return;
 939    }
 940
 941    pipe_transfer_unmap(pipe, strb->transfer);
 942    strb->transfer = NULL;
 943 }
 944
 945
 946 /**
 947  * Called via ctx->Driver.EvaluateDepthValues.
 948  */
 949 static void
 950 st_EvaluateDepthValues(struct gl_context *ctx)
 951 {
 952    struct st_context *st = st_context(ctx);
 953
 954    st_validate_state(st, ST_PIPELINE_UPDATE_FRAMEBUFFER);
 955
 956    st->pipe->evaluate_depth_buffer(st->pipe);
 957 }
 958
 959
 960 void
 961 st_init_fbo_functions(struct dd_function_table *functions)
 962 {
 963    functions->NewFramebuffer = _mesa_new_framebuffer;
 964    functions->NewRenderbuffer = st_new_renderbuffer;
 965    functions->FramebufferRenderbuffer = _mesa_FramebufferRenderbuffer_sw;
 966    functions->RenderTexture = st_render_texture;
 967    functions->FinishRenderTexture = st_finish_render_texture;
 968    functions->ValidateFramebuffer = st_validate_framebuffer;
 969    functions->DiscardFramebuffer = st_discard_framebuffer;
 970
 971    functions->DrawBufferAllocate = st_DrawBufferAllocate;
 972    functions->ReadBuffer = st_ReadBuffer;
 973
 974    functions->MapRenderbuffer = st_MapRenderbuffer;
 975    functions->UnmapRenderbuffer = st_UnmapRenderbuffer;
 976    functions->EvaluateDepthValues = st_EvaluateDepthValues;
 977 }