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
  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    case PIPE_FORMAT_R8G8B8_UNORM:
 359       strb->Base.InternalFormat = GL_RGB8;
 360       break;
 361    case PIPE_FORMAT_R8G8B8A8_SRGB:
 362    case PIPE_FORMAT_B8G8R8A8_SRGB:
 363    case PIPE_FORMAT_A8R8G8B8_SRGB:
 364       strb->Base.InternalFormat = GL_SRGB8_ALPHA8;
 365       break;
 366    case PIPE_FORMAT_R8G8B8X8_SRGB:
 367    case PIPE_FORMAT_B8G8R8X8_SRGB:
 368    case PIPE_FORMAT_X8R8G8B8_SRGB:
 369       strb->Base.InternalFormat = GL_SRGB8;
 370       break;
 371    case PIPE_FORMAT_B5G5R5A1_UNORM:
 372       strb->Base.InternalFormat = GL_RGB5_A1;
 373       break;
 374    case PIPE_FORMAT_B4G4R4A4_UNORM:
 375       strb->Base.InternalFormat = GL_RGBA4;
 376       break;
 377    case PIPE_FORMAT_B5G6R5_UNORM:
 378       strb->Base.InternalFormat = GL_RGB565;
 379       break;
 380    case PIPE_FORMAT_Z16_UNORM:
 381       strb->Base.InternalFormat = GL_DEPTH_COMPONENT16;
 382       break;
 383    case PIPE_FORMAT_Z32_UNORM:
 384       strb->Base.InternalFormat = GL_DEPTH_COMPONENT32;
 385       break;
 386    case PIPE_FORMAT_Z24_UNORM_S8_UINT:
 387    case PIPE_FORMAT_S8_UINT_Z24_UNORM:
 388       strb->Base.InternalFormat = GL_DEPTH24_STENCIL8_EXT;
 389       break;
 390    case PIPE_FORMAT_Z24X8_UNORM:
 391    case PIPE_FORMAT_X8Z24_UNORM:
 392       strb->Base.InternalFormat = GL_DEPTH_COMPONENT24;
 393       break;
 394    case PIPE_FORMAT_S8_UINT:
 395       strb->Base.InternalFormat = GL_STENCIL_INDEX8_EXT;
 396       break;
 397    case PIPE_FORMAT_R16G16B16A16_SNORM:
 398       /* accum buffer */
 399       strb->Base.InternalFormat = GL_RGBA16_SNORM;
 400       break;
 401    case PIPE_FORMAT_R16G16B16A16_UNORM:
 402       strb->Base.InternalFormat = GL_RGBA16;
 403       break;
 404    case PIPE_FORMAT_R16G16B16_UNORM:
 405       strb->Base.InternalFormat = GL_RGB16;
 406       break;
 407    case PIPE_FORMAT_R8_UNORM:
 408       strb->Base.InternalFormat = GL_R8;
 409       break;
 410    case PIPE_FORMAT_R8G8_UNORM:
 411       strb->Base.InternalFormat = GL_RG8;
 412       break;
 413    case PIPE_FORMAT_R16_UNORM:
 414       strb->Base.InternalFormat = GL_R16;
 415       break;
 416    case PIPE_FORMAT_R16G16_UNORM:
 417       strb->Base.InternalFormat = GL_RG16;
 418       break;
 419    case PIPE_FORMAT_R32G32B32A32_FLOAT:
 420       strb->Base.InternalFormat = GL_RGBA32F;
 421       break;
 422    case PIPE_FORMAT_R32G32B32X32_FLOAT:
 423    case PIPE_FORMAT_R32G32B32_FLOAT:
 424       strb->Base.InternalFormat = GL_RGB32F;
 425       break;
 426    case PIPE_FORMAT_R16G16B16A16_FLOAT:
 427       strb->Base.InternalFormat = GL_RGBA16F;
 428       break;
 429    case PIPE_FORMAT_R16G16B16X16_FLOAT:
 430       strb->Base.InternalFormat = GL_RGB16F;
 431       break;
 432    default:
 433       _mesa_problem(NULL,
 434                     "Unexpected format %s in st_new_renderbuffer_fb",
 435                     util_format_name(format));
 436       free(strb);
 437       return NULL;
 438    }
 439
 440    /* st-specific methods */
 441    strb->Base.Delete = st_renderbuffer_delete;
 442    strb->Base.AllocStorage = st_renderbuffer_alloc_storage;
 443
 444    /* surface is allocated in st_renderbuffer_alloc_storage() */
 445    strb->surface = NULL;
 446
 447    return &strb->Base;
 448 }
 449
 450
 451 /**
 452  * Create or update the pipe_surface of a FBO renderbuffer.
 453  * This is usually called after st_finalize_texture.
 454  */
 455 void
 456 st_update_renderbuffer_surface(struct st_context *st,
 457                                struct st_renderbuffer *strb)
 458 {
 459    struct pipe_context *pipe = st->pipe;
 460    struct pipe_resource *resource = strb->texture;
 461    const struct st_texture_object *stTexObj = NULL;
 462    unsigned rtt_width = strb->Base.Width;
 463    unsigned rtt_height = strb->Base.Height;
 464    unsigned rtt_depth = strb->Base.Depth;
 465
 466    /*
 467     * For winsys fbo, it is possible that the renderbuffer is sRGB-capable but
 468     * the format of strb->texture is linear (because we have no control over
 469     * the format).  Check strb->Base.Format instead of strb->texture->format
 470     * to determine if the rb is sRGB-capable.
 471     */
 472    boolean enable_srgb = st->ctx->Color.sRGBEnabled &&
 473       _mesa_is_format_srgb(strb->Base.Format);
 474    enum pipe_format format = resource->format;
 475
 476    if (strb->is_rtt) {
 477       stTexObj = st_texture_object(strb->Base.TexImage->TexObject);
 478       if (stTexObj->surface_based)
 479          format = stTexObj->surface_format;
 480    }
 481
 482    format = enable_srgb ? util_format_srgb(format) : util_format_linear(format);
 483
 484    if (resource->target == PIPE_TEXTURE_1D_ARRAY) {
 485       rtt_depth = rtt_height;
 486       rtt_height = 1;
 487    }
 488
 489    /* find matching mipmap level size */
 490    unsigned level;
 491    for (level = 0; level <= resource->last_level; level++) {
 492       if (u_minify(resource->width0, level) == rtt_width &&
 493           u_minify(resource->height0, level) == rtt_height &&
 494           (resource->target != PIPE_TEXTURE_3D ||
 495            u_minify(resource->depth0, level) == rtt_depth)) {
 496          break;
 497       }
 498    }
 499    assert(level <= resource->last_level);
 500
 501    /* determine the layer bounds */
 502    unsigned first_layer, last_layer;
 503    if (strb->rtt_layered) {
 504       first_layer = 0;
 505       last_layer = util_max_layer(strb->texture, level);
 506    }
 507    else {
 508       first_layer =
 509       last_layer = strb->rtt_face + strb->rtt_slice;
 510    }
 511
 512    /* Adjust for texture views */
 513    if (strb->is_rtt && resource->array_size > 1 &&
 514        stTexObj->base.Immutable) {
 515       const struct gl_texture_object *tex = &stTexObj->base;
 516       first_layer += tex->MinLayer;
 517       if (!strb->rtt_layered)
 518          last_layer += tex->MinLayer;
 519       else
 520          last_layer = MIN2(first_layer + tex->NumLayers - 1, last_layer);
 521    }
 522
 523    struct pipe_surface **psurf =
 524       enable_srgb ? &strb->surface_srgb : &strb->surface_linear;
 525    struct pipe_surface *surf = *psurf;
 526
 527    if (!surf ||
 528        surf->texture->nr_samples != strb->Base.NumSamples ||
 529        surf->texture->nr_storage_samples != strb->Base.NumStorageSamples ||
 530        surf->format != format ||
 531        surf->texture != resource ||
 532        surf->width != rtt_width ||
 533        surf->height != rtt_height ||
 534        surf->nr_samples != strb->rtt_nr_samples ||
 535        surf->u.tex.level != level ||
 536        surf->u.tex.first_layer != first_layer ||
 537        surf->u.tex.last_layer != last_layer) {
 538       /* create a new pipe_surface */
 539       struct pipe_surface surf_tmpl;
 540       memset(&surf_tmpl, 0, sizeof(surf_tmpl));
 541       surf_tmpl.format = format;
 542       surf_tmpl.nr_samples = strb->rtt_nr_samples;
 543       surf_tmpl.u.tex.level = level;
 544       surf_tmpl.u.tex.first_layer = first_layer;
 545       surf_tmpl.u.tex.last_layer = last_layer;
 546
 547       pipe_surface_release(pipe, psurf);
 548
 549       *psurf = pipe->create_surface(pipe, resource, &surf_tmpl);
 550    }
 551    strb->surface = *psurf;
 552 }
 553
 554
 555 /**
 556  * Return the pipe_resource which stores a particular texture image.
 557  */
 558 static struct pipe_resource *
 559 get_teximage_resource(struct gl_texture_object *texObj,
 560                       unsigned face, unsigned level)
 561 {
 562    struct st_texture_image *stImg =
 563       st_texture_image(texObj->Image[face][level]);
 564
 565    return stImg->pt;
 566 }
 567
 568
 569 /**
 570  * Called by ctx->Driver.RenderTexture
 571  */
 572 static void
 573 st_render_texture(struct gl_context *ctx,
 574                   struct gl_framebuffer *fb,
 575                   struct gl_renderbuffer_attachment *att)
 576 {
 577    struct st_context *st = st_context(ctx);
 578    struct gl_renderbuffer *rb = att->Renderbuffer;
 579    struct st_renderbuffer *strb = st_renderbuffer(rb);
 580    struct pipe_resource *pt;
 581
 582    pt = get_teximage_resource(att->Texture,
 583                               att->CubeMapFace,
 584                               att->TextureLevel);
 585    assert(pt);
 586
 587    /* point renderbuffer at texobject */
 588    strb->is_rtt = TRUE;
 589    strb->rtt_face = att->CubeMapFace;
 590    strb->rtt_slice = att->Zoffset;
 591    strb->rtt_layered = att->Layered;
 592    strb->rtt_nr_samples = att->NumSamples;
 593    pipe_resource_reference(&strb->texture, pt);
 594
 595    st_update_renderbuffer_surface(st, strb);
 596
 597    /* Invalidate buffer state so that the pipe's framebuffer state
 598     * gets updated.
 599     * That's where the new renderbuffer (which we just created) gets
 600     * passed to the pipe as a (color/depth) render target.
 601     */
 602    st_invalidate_buffers(st);
 603
 604
 605    /* Need to trigger a call to update_framebuffer() since we just
 606     * attached a new renderbuffer.
 607     */
 608    ctx->NewState |= _NEW_BUFFERS;
 609 }
 610
 611
 612 /**
 613  * Called via ctx->Driver.FinishRenderTexture.
 614  */
 615 static void
 616 st_finish_render_texture(struct gl_context *ctx, struct gl_renderbuffer *rb)
 617 {
 618    struct st_context *st = st_context(ctx);
 619    struct st_renderbuffer *strb = st_renderbuffer(rb);
 620
 621    if (!strb)
 622       return;
 623
 624    strb->is_rtt = FALSE;
 625
 626    /* restore previous framebuffer state */
 627    st_invalidate_buffers(st);
 628 }
 629
 630
 631 /** Debug helper */
 632 static void
 633 st_fbo_invalid(const char *reason)
 634 {
 635    if (MESA_DEBUG_FLAGS & DEBUG_INCOMPLETE_FBO) {
 636       _mesa_debug(NULL, "Invalid FBO: %s\n", reason);
 637    }
 638 }
 639
 640
 641 /**
 642  * Validate a renderbuffer attachment for a particular set of bindings.
 643  */
 644 static GLboolean
 645 st_validate_attachment(struct gl_context *ctx,
 646                        struct pipe_screen *screen,
 647                        const struct gl_renderbuffer_attachment *att,
 648                        unsigned bindings)
 649 {
 650    const struct st_texture_object *stObj = st_texture_object(att->Texture);
 651    enum pipe_format format;
 652    mesa_format texFormat;
 653    GLboolean valid;
 654
 655    /* Sanity check: we must be binding the surface as a (color) render target
 656     * or depth/stencil target.
 657     */
 658    assert(bindings == PIPE_BIND_RENDER_TARGET ||
 659           bindings == PIPE_BIND_DEPTH_STENCIL);
 660
 661    /* Only validate texture attachments for now, since
 662     * st_renderbuffer_alloc_storage makes sure that
 663     * the format is supported.
 664     */
 665    if (att->Type != GL_TEXTURE)
 666       return GL_TRUE;
 667
 668    if (!stObj || !stObj->pt)
 669       return GL_FALSE;
 670
 671    format = stObj->pt->format;
 672    texFormat = att->Renderbuffer->TexImage->TexFormat;
 673
 674    /* If the encoding is sRGB and sRGB rendering cannot be enabled,
 675     * check for linear format support instead.
 676     * Later when we create a surface, we change the format to a linear one. */
 677    if (!ctx->Extensions.EXT_sRGB && _mesa_is_format_srgb(texFormat)) {
 678       const mesa_format linearFormat = _mesa_get_srgb_format_linear(texFormat);
 679       format = st_mesa_format_to_pipe_format(st_context(ctx), linearFormat);
 680    }
 681
 682    valid = screen->is_format_supported(screen, format,
 683                                        PIPE_TEXTURE_2D,
 684                                        stObj->pt->nr_samples,
 685                                        stObj->pt->nr_storage_samples,
 686                                        bindings);
 687    if (!valid) {
 688       st_fbo_invalid("Invalid format");
 689    }
 690
 691    return valid;
 692 }
 693
 694
 695 /**
 696  * Check that the framebuffer configuration is valid in terms of what
 697  * the driver can support.
 698  *
 699  * For Gallium we only supports combined Z+stencil, not separate buffers.
 700  */
 701 static void
 702 st_validate_framebuffer(struct gl_context *ctx, struct gl_framebuffer *fb)
 703 {
 704    struct st_context *st = st_context(ctx);
 705    struct pipe_screen *screen = st->pipe->screen;
 706    const struct gl_renderbuffer_attachment *depth =
 707          &fb->Attachment[BUFFER_DEPTH];
 708    const struct gl_renderbuffer_attachment *stencil =
 709          &fb->Attachment[BUFFER_STENCIL];
 710    GLuint i;
 711    enum pipe_format first_format = PIPE_FORMAT_NONE;
 712    boolean mixed_formats =
 713          screen->get_param(screen, PIPE_CAP_MIXED_COLORBUFFER_FORMATS) != 0;
 714
 715    if (depth->Type && stencil->Type && depth->Type != stencil->Type) {
 716       st_fbo_invalid("Different Depth/Stencil buffer formats");
 717       fb->_Status = GL_FRAMEBUFFER_UNSUPPORTED_EXT;
 718       return;
 719    }
 720    if (depth->Type == GL_RENDERBUFFER_EXT &&
 721        stencil->Type == GL_RENDERBUFFER_EXT &&
 722        depth->Renderbuffer != stencil->Renderbuffer) {
 723       st_fbo_invalid("Separate Depth/Stencil buffers");
 724       fb->_Status = GL_FRAMEBUFFER_UNSUPPORTED_EXT;
 725       return;
 726    }
 727    if (depth->Type == GL_TEXTURE &&
 728        stencil->Type == GL_TEXTURE &&
 729        depth->Texture != stencil->Texture) {
 730       fb->_Status = GL_FRAMEBUFFER_UNSUPPORTED_EXT;
 731       st_fbo_invalid("Different Depth/Stencil textures");
 732       return;
 733    }
 734
 735    if (!st_validate_attachment(ctx, screen, depth, PIPE_BIND_DEPTH_STENCIL)) {
 736       fb->_Status = GL_FRAMEBUFFER_UNSUPPORTED_EXT;
 737       st_fbo_invalid("Invalid depth attachment");
 738       return;
 739    }
 740    if (!st_validate_attachment(ctx, screen, stencil, PIPE_BIND_DEPTH_STENCIL)) {
 741       fb->_Status = GL_FRAMEBUFFER_UNSUPPORTED_EXT;
 742       st_fbo_invalid("Invalid stencil attachment");
 743       return;
 744    }
 745    for (i = 0; i < ctx->Const.MaxColorAttachments; i++) {
 746       struct gl_renderbuffer_attachment *att =
 747             &fb->Attachment[BUFFER_COLOR0 + i];
 748       enum pipe_format format;
 749
 750       if (!st_validate_attachment(ctx, screen, att, PIPE_BIND_RENDER_TARGET)) {
 751          fb->_Status = GL_FRAMEBUFFER_UNSUPPORTED_EXT;
 752          st_fbo_invalid("Invalid color attachment");
 753          return;
 754       }
 755
 756       if (!mixed_formats) {
 757          /* Disallow mixed formats. */
 758          if (att->Type != GL_NONE) {
 759             format = st_renderbuffer(att->Renderbuffer)->surface->format;
 760          } else {
 761             continue;
 762          }
 763
 764          if (first_format == PIPE_FORMAT_NONE) {
 765             first_format = format;
 766          } else if (format != first_format) {
 767             fb->_Status = GL_FRAMEBUFFER_UNSUPPORTED_EXT;
 768             st_fbo_invalid("Mixed color formats");
 769             return;
 770          }
 771       }
 772    }
 773 }
 774
 775
 776 /**
 777  * Called by ctx->Driver.DiscardFramebuffer
 778  */
 779 static void
 780 st_discard_framebuffer(struct gl_context *ctx, struct gl_framebuffer *fb,
 781                        struct gl_renderbuffer_attachment *att)
 782 {
 783    struct st_context *st = st_context(ctx);
 784    struct pipe_resource *prsc;
 785
 786    if (!att->Renderbuffer || !att->Complete)
 787       return;
 788
 789    prsc = st_renderbuffer(att->Renderbuffer)->surface->texture;
 790
 791    /* using invalidate_resource will only work for simple 2D resources */
 792    if (prsc->depth0 != 1 || prsc->array_size != 1 || prsc->last_level != 0)
 793       return;
 794
 795    if (st->pipe->invalidate_resource)
 796       st->pipe->invalidate_resource(st->pipe, prsc);
 797 }
 798
 799
 800 /**
 801  * Called via glDrawBuffer.  We only provide this driver function so that we
 802  * can check if we need to allocate a new renderbuffer.  Specifically, we
 803  * don't usually allocate a front color buffer when using a double-buffered
 804  * visual.  But if the app calls glDrawBuffer(GL_FRONT) we need to allocate
 805  * that buffer.  Note, this is only for window system buffers, not user-
 806  * created FBOs.
 807  */
 808 static void
 809 st_DrawBufferAllocate(struct gl_context *ctx)
 810 {
 811    struct st_context *st = st_context(ctx);
 812    struct gl_framebuffer *fb = ctx->DrawBuffer;
 813
 814    if (_mesa_is_winsys_fbo(fb)) {
 815       GLuint i;
 816       /* add the renderbuffers on demand */
 817       for (i = 0; i < fb->_NumColorDrawBuffers; i++) {
 818          gl_buffer_index idx = fb->_ColorDrawBufferIndexes[i];
 819
 820          if (idx != BUFFER_NONE) {
 821             st_manager_add_color_renderbuffer(st, fb, idx);
 822          }
 823       }
 824    }
 825 }
 826
 827
 828 /**
 829  * Called via glReadBuffer.  As with st_DrawBufferAllocate, we use this
 830  * function to check if we need to allocate a renderbuffer on demand.
 831  */
 832 static void
 833 st_ReadBuffer(struct gl_context *ctx, GLenum buffer)
 834 {
 835    struct st_context *st = st_context(ctx);
 836    struct gl_framebuffer *fb = ctx->ReadBuffer;
 837
 838    (void) buffer;
 839
 840    /* Check if we need to allocate a front color buffer.
 841     * Front buffers are often allocated on demand (other color buffers are
 842     * always allocated in advance).
 843     */
 844    if ((fb->_ColorReadBufferIndex == BUFFER_FRONT_LEFT ||
 845         fb->_ColorReadBufferIndex == BUFFER_FRONT_RIGHT) &&
 846        fb->Attachment[fb->_ColorReadBufferIndex].Type == GL_NONE) {
 847       assert(_mesa_is_winsys_fbo(fb));
 848       /* add the buffer */
 849       st_manager_add_color_renderbuffer(st, fb, fb->_ColorReadBufferIndex);
 850       _mesa_update_state(ctx);
 851       st_validate_state(st, ST_PIPELINE_UPDATE_FRAMEBUFFER);
 852    }
 853 }
 854
 855
 856
 857 /**
 858  * Called via ctx->Driver.MapRenderbuffer.
 859  */
 860 static void
 861 st_MapRenderbuffer(struct gl_context *ctx,
 862                    struct gl_renderbuffer *rb,
 863                    GLuint x, GLuint y, GLuint w, GLuint h,
 864                    GLbitfield mode,
 865                    GLubyte **mapOut, GLint *rowStrideOut,
 866                    bool flip_y)
 867 {
 868    struct st_context *st = st_context(ctx);
 869    struct st_renderbuffer *strb = st_renderbuffer(rb);
 870    struct pipe_context *pipe = st->pipe;
 871    const GLboolean invert = flip_y;
 872    GLuint y2;
 873    GLubyte *map;
 874
 875    if (strb->software) {
 876       /* software-allocated renderbuffer (probably an accum buffer) */
 877       if (strb->data) {
 878          GLint bpp = _mesa_get_format_bytes(strb->Base.Format);
 879          GLint stride = _mesa_format_row_stride(strb->Base.Format,
 880                                                 strb->Base.Width);
 881          *mapOut = (GLubyte *) strb->data + y * stride + x * bpp;
 882          *rowStrideOut = stride;
 883       }
 884       else {
 885          *mapOut = NULL;
 886          *rowStrideOut = 0;
 887       }
 888       return;
 889    }
 890
 891    /* Check for unexpected flags */
 892    assert((mode & ~(GL_MAP_READ_BIT |
 893                     GL_MAP_WRITE_BIT |
 894                     GL_MAP_INVALIDATE_RANGE_BIT)) == 0);
 895
 896    const enum pipe_transfer_usage transfer_flags =
 897       st_access_flags_to_transfer_flags(mode, false);
 898
 899    /* Note: y=0=bottom of buffer while y2=0=top of buffer.
 900     * 'invert' will be true for window-system buffers and false for
 901     * user-allocated renderbuffers and textures.
 902     */
 903    if (invert)
 904       y2 = strb->Base.Height - y - h;
 905    else
 906       y2 = y;
 907
 908     map = pipe_transfer_map(pipe,
 909                             strb->texture,
 910                             strb->surface->u.tex.level,
 911                             strb->surface->u.tex.first_layer,
 912                             transfer_flags, x, y2, w, h, &strb->transfer);
 913    if (map) {
 914       if (invert) {
 915          *rowStrideOut = -(int) strb->transfer->stride;
 916          map += (h - 1) * strb->transfer->stride;
 917       }
 918       else {
 919          *rowStrideOut = strb->transfer->stride;
 920       }
 921       *mapOut = map;
 922    }
 923    else {
 924       *mapOut = NULL;
 925       *rowStrideOut = 0;
 926    }
 927 }
 928
 929
 930 /**
 931  * Called via ctx->Driver.UnmapRenderbuffer.
 932  */
 933 static void
 934 st_UnmapRenderbuffer(struct gl_context *ctx,
 935                      struct gl_renderbuffer *rb)
 936 {
 937    struct st_context *st = st_context(ctx);
 938    struct st_renderbuffer *strb = st_renderbuffer(rb);
 939    struct pipe_context *pipe = st->pipe;
 940
 941    if (strb->software) {
 942       /* software-allocated renderbuffer (probably an accum buffer) */
 943       return;
 944    }
 945
 946    pipe_transfer_unmap(pipe, strb->transfer);
 947    strb->transfer = NULL;
 948 }
 949
 950
 951 /**
 952  * Called via ctx->Driver.EvaluateDepthValues.
 953  */
 954 static void
 955 st_EvaluateDepthValues(struct gl_context *ctx)
 956 {
 957    struct st_context *st = st_context(ctx);
 958
 959    st_validate_state(st, ST_PIPELINE_UPDATE_FRAMEBUFFER);
 960
 961    st->pipe->evaluate_depth_buffer(st->pipe);
 962 }
 963
 964
 965 void
 966 st_init_fbo_functions(struct dd_function_table *functions)
 967 {
 968    functions->NewFramebuffer = _mesa_new_framebuffer;
 969    functions->NewRenderbuffer = st_new_renderbuffer;
 970    functions->FramebufferRenderbuffer = _mesa_FramebufferRenderbuffer_sw;
 971    functions->RenderTexture = st_render_texture;
 972    functions->FinishRenderTexture = st_finish_render_texture;
 973    functions->ValidateFramebuffer = st_validate_framebuffer;
 974    functions->DiscardFramebuffer = st_discard_framebuffer;
 975
 976    functions->DrawBufferAllocate = st_DrawBufferAllocate;
 977    functions->ReadBuffer = st_ReadBuffer;
 978
 979    functions->MapRenderbuffer = st_MapRenderbuffer;
 980    functions->UnmapRenderbuffer = st_UnmapRenderbuffer;
 981    functions->EvaluateDepthValues = st_EvaluateDepthValues;
 982 }