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
  44 #include "pipe/p_context.h"
  45 #include "pipe/p_defines.h"
  46 #include "pipe/p_screen.h"
  47 #include "st_context.h"
  48 #include "st_cb_fbo.h"
  49 #include "st_cb_flush.h"
  50 #include "st_cb_texture.h"
  51 #include "st_format.h"
  52 #include "st_texture.h"
  53 #include "st_manager.h"
  54
  55 #include "util/u_format.h"
  56 #include "util/u_inlines.h"
  57 #include "util/u_surface.h"
  58
  59
  60 static GLboolean
  61 st_renderbuffer_alloc_sw_storage(struct gl_context * ctx,
  62                                  struct gl_renderbuffer *rb,
  63                                  GLenum internalFormat,
  64                                  GLuint width, GLuint height)
  65 {
  66    struct st_context *st = st_context(ctx);
  67    struct st_renderbuffer *strb = st_renderbuffer(rb);
  68    enum pipe_format format;
  69    size_t size;
  70
  71    free(strb->data);
  72    strb->data = NULL;
  73
  74    if (internalFormat == GL_RGBA16_SNORM) {
  75       /* Special case for software accum buffers.  Otherwise, if the
  76        * call to st_choose_renderbuffer_format() fails (because the
  77        * driver doesn't support signed 16-bit/channel colors) we'd
  78        * just return without allocating the software accum buffer.
  79        */
  80       format = PIPE_FORMAT_R16G16B16A16_SNORM;
  81    }
  82    else {
  83       format = st_choose_renderbuffer_format(st, internalFormat, 0);
  84
  85       /* Not setting gl_renderbuffer::Format here will cause
  86        * FRAMEBUFFER_UNSUPPORTED and ValidateFramebuffer will not be called.
  87        */
  88       if (format == PIPE_FORMAT_NONE) {
  89          return GL_TRUE;
  90       }
  91    }
  92
  93    strb->Base.Format = st_pipe_format_to_mesa_format(format);
  94
  95    size = _mesa_format_image_size(strb->Base.Format, width, height, 1);
  96    strb->data = malloc(size);
  97    return strb->data != NULL;
  98 }
  99
 100
 101 /**
 102  * gl_renderbuffer::AllocStorage()
 103  * This is called to allocate the original drawing surface, and
 104  * during window resize.
 105  */
 106 static GLboolean
 107 st_renderbuffer_alloc_storage(struct gl_context * ctx,
 108                               struct gl_renderbuffer *rb,
 109                               GLenum internalFormat,
 110                               GLuint width, GLuint height)
 111 {
 112    struct st_context *st = st_context(ctx);
 113    struct pipe_context *pipe = st->pipe;
 114    struct pipe_screen *screen = st->pipe->screen;
 115    struct st_renderbuffer *strb = st_renderbuffer(rb);
 116    enum pipe_format format = PIPE_FORMAT_NONE;
 117    struct pipe_surface surf_tmpl;
 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, NULL );
 134    pipe_resource_reference( &strb->texture, NULL );
 135
 136    /* If an sRGB framebuffer is unsupported, sRGB formats behave like linear
 137     * formats.
 138     */
 139    if (!ctx->Extensions.EXT_framebuffer_sRGB) {
 140       internalFormat = _mesa_get_linear_internalformat(internalFormat);
 141    }
 142
 143    /* Handle multisample renderbuffers first.
 144     *
 145     * From ARB_framebuffer_object:
 146     *   If <samples> is zero, then RENDERBUFFER_SAMPLES is set to zero.
 147     *   Otherwise <samples> represents a request for a desired minimum
 148     *   number of samples. Since different implementations may support
 149     *   different sample counts for multisampled rendering, the actual
 150     *   number of samples allocated for the renderbuffer image is
 151     *   implementation dependent.  However, the resulting value for
 152     *   RENDERBUFFER_SAMPLES is guaranteed to be greater than or equal
 153     *   to <samples> and no more than the next larger sample count supported
 154     *   by the implementation.
 155     *
 156     * So let's find the supported number of samples closest to NumSamples.
 157     * (NumSamples == 1) is treated the same as (NumSamples == 0).
 158     */
 159    if (rb->NumSamples > 1) {
 160       unsigned i;
 161
 162       for (i = rb->NumSamples; i <= ctx->Const.MaxSamples; i++) {
 163          format = st_choose_renderbuffer_format(st, internalFormat, i);
 164
 165          if (format != PIPE_FORMAT_NONE) {
 166             rb->NumSamples = i;
 167             break;
 168          }
 169       }
 170    } else {
 171       format = st_choose_renderbuffer_format(st, internalFormat, 0);
 172    }
 173
 174    /* Not setting gl_renderbuffer::Format here will cause
 175     * FRAMEBUFFER_UNSUPPORTED and ValidateFramebuffer will not be called.
 176     */
 177    if (format == PIPE_FORMAT_NONE) {
 178       return GL_TRUE;
 179    }
 180
 181    strb->Base.Format = st_pipe_format_to_mesa_format(format);
 182
 183    if (width == 0 || height == 0) {
 184       /* if size is zero, nothing to allocate */
 185       return GL_TRUE;
 186    }
 187
 188    /* Setup new texture template.
 189     */
 190    memset(&templ, 0, sizeof(templ));
 191    templ.target = st->internal_target;
 192    templ.format = format;
 193    templ.width0 = width;
 194    templ.height0 = height;
 195    templ.depth0 = 1;
 196    templ.array_size = 1;
 197    templ.nr_samples = rb->NumSamples;
 198    if (util_format_is_depth_or_stencil(format)) {
 199       templ.bind = PIPE_BIND_DEPTH_STENCIL;
 200    }
 201    else if (strb->Base.Name != 0) {
 202       /* this is a user-created renderbuffer */
 203       templ.bind = PIPE_BIND_RENDER_TARGET;
 204    }
 205    else {
 206       /* this is a window-system buffer */
 207       templ.bind = (PIPE_BIND_DISPLAY_TARGET |
 208                     PIPE_BIND_RENDER_TARGET);
 209    }
 210
 211    strb->texture = screen->resource_create(screen, &templ);
 212
 213    if (!strb->texture)
 214       return FALSE;
 215
 216    u_surface_default_template(&surf_tmpl, strb->texture);
 217    strb->surface = pipe->create_surface(pipe,
 218                                         strb->texture,
 219                                         &surf_tmpl);
 220    if (strb->surface) {
 221       assert(strb->surface->texture);
 222       assert(strb->surface->format);
 223       assert(strb->surface->width == width);
 224       assert(strb->surface->height == height);
 225    }
 226
 227    return strb->surface != NULL;
 228 }
 229
 230
 231 /**
 232  * gl_renderbuffer::Delete()
 233  */
 234 static void
 235 st_renderbuffer_delete(struct gl_context *ctx, struct gl_renderbuffer *rb)
 236 {
 237    struct st_renderbuffer *strb = st_renderbuffer(rb);
 238    if (ctx) {
 239       struct st_context *st = st_context(ctx);
 240       pipe_surface_release(st->pipe, &strb->surface);
 241    }
 242    pipe_resource_reference(&strb->texture, NULL);
 243    free(strb->data);
 244    _mesa_delete_renderbuffer(ctx, rb);
 245 }
 246
 247
 248 /**
 249  * Called via ctx->Driver.NewFramebuffer()
 250  */
 251 static struct gl_framebuffer *
 252 st_new_framebuffer(struct gl_context *ctx, GLuint name)
 253 {
 254    /* XXX not sure we need to subclass gl_framebuffer for pipe */
 255    return _mesa_new_framebuffer(ctx, name);
 256 }
 257
 258
 259 /**
 260  * Called via ctx->Driver.NewRenderbuffer()
 261  */
 262 static struct gl_renderbuffer *
 263 st_new_renderbuffer(struct gl_context *ctx, GLuint name)
 264 {
 265    struct st_renderbuffer *strb = ST_CALLOC_STRUCT(st_renderbuffer);
 266    if (strb) {
 267       assert(name != 0);
 268       _mesa_init_renderbuffer(&strb->Base, name);
 269       strb->Base.Delete = st_renderbuffer_delete;
 270       strb->Base.AllocStorage = st_renderbuffer_alloc_storage;
 271       return &strb->Base;
 272    }
 273    return NULL;
 274 }
 275
 276
 277 /**
 278  * Allocate a renderbuffer for a an on-screen window (not a user-created
 279  * renderbuffer).  The window system code determines the format.
 280  */
 281 struct gl_renderbuffer *
 282 st_new_renderbuffer_fb(enum pipe_format format, int samples, boolean sw)
 283 {
 284    struct st_renderbuffer *strb;
 285
 286    strb = ST_CALLOC_STRUCT(st_renderbuffer);
 287    if (!strb) {
 288       _mesa_error(NULL, GL_OUT_OF_MEMORY, "creating renderbuffer");
 289       return NULL;
 290    }
 291
 292    _mesa_init_renderbuffer(&strb->Base, 0);
 293    strb->Base.ClassID = 0x4242; /* just a unique value */
 294    strb->Base.NumSamples = samples;
 295    strb->Base.Format = st_pipe_format_to_mesa_format(format);
 296    strb->Base._BaseFormat = _mesa_get_format_base_format(strb->Base.Format);
 297    strb->software = sw;
 298
 299    switch (format) {
 300    case PIPE_FORMAT_R8G8B8A8_UNORM:
 301    case PIPE_FORMAT_B8G8R8A8_UNORM:
 302    case PIPE_FORMAT_A8R8G8B8_UNORM:
 303       strb->Base.InternalFormat = GL_RGBA8;
 304       break;
 305    case PIPE_FORMAT_R8G8B8X8_UNORM:
 306    case PIPE_FORMAT_B8G8R8X8_UNORM:
 307    case PIPE_FORMAT_X8R8G8B8_UNORM:
 308       strb->Base.InternalFormat = GL_RGB8;
 309       break;
 310    case PIPE_FORMAT_R8G8B8A8_SRGB:
 311    case PIPE_FORMAT_B8G8R8A8_SRGB:
 312    case PIPE_FORMAT_A8R8G8B8_SRGB:
 313       strb->Base.InternalFormat = GL_SRGB8_ALPHA8;
 314       break;
 315    case PIPE_FORMAT_R8G8B8X8_SRGB:
 316    case PIPE_FORMAT_B8G8R8X8_SRGB:
 317    case PIPE_FORMAT_X8R8G8B8_SRGB:
 318       strb->Base.InternalFormat = GL_SRGB8;
 319       break;
 320    case PIPE_FORMAT_B5G5R5A1_UNORM:
 321       strb->Base.InternalFormat = GL_RGB5_A1;
 322       break;
 323    case PIPE_FORMAT_B4G4R4A4_UNORM:
 324       strb->Base.InternalFormat = GL_RGBA4;
 325       break;
 326    case PIPE_FORMAT_B5G6R5_UNORM:
 327       strb->Base.InternalFormat = GL_RGB565;
 328       break;
 329    case PIPE_FORMAT_Z16_UNORM:
 330       strb->Base.InternalFormat = GL_DEPTH_COMPONENT16;
 331       break;
 332    case PIPE_FORMAT_Z32_UNORM:
 333       strb->Base.InternalFormat = GL_DEPTH_COMPONENT32;
 334       break;
 335    case PIPE_FORMAT_Z24_UNORM_S8_UINT:
 336    case PIPE_FORMAT_S8_UINT_Z24_UNORM:
 337       strb->Base.InternalFormat = GL_DEPTH24_STENCIL8_EXT;
 338       break;
 339    case PIPE_FORMAT_Z24X8_UNORM:
 340    case PIPE_FORMAT_X8Z24_UNORM:
 341       strb->Base.InternalFormat = GL_DEPTH_COMPONENT24;
 342       break;
 343    case PIPE_FORMAT_S8_UINT:
 344       strb->Base.InternalFormat = GL_STENCIL_INDEX8_EXT;
 345       break;
 346    case PIPE_FORMAT_R16G16B16A16_SNORM:
 347       /* accum buffer */
 348       strb->Base.InternalFormat = GL_RGBA16_SNORM;
 349       break;
 350    case PIPE_FORMAT_R16G16B16A16_UNORM:
 351       strb->Base.InternalFormat = GL_RGBA16;
 352       break;
 353    case PIPE_FORMAT_R8_UNORM:
 354       strb->Base.InternalFormat = GL_R8;
 355       break;
 356    case PIPE_FORMAT_R8G8_UNORM:
 357       strb->Base.InternalFormat = GL_RG8;
 358       break;
 359    case PIPE_FORMAT_R16_UNORM:
 360       strb->Base.InternalFormat = GL_R16;
 361       break;
 362    case PIPE_FORMAT_R16G16_UNORM:
 363       strb->Base.InternalFormat = GL_RG16;
 364       break;
 365    case PIPE_FORMAT_R32G32B32A32_FLOAT:
 366       strb->Base.InternalFormat = GL_RGBA32F;
 367       break;
 368    case PIPE_FORMAT_R16G16B16A16_FLOAT:
 369       strb->Base.InternalFormat = GL_RGBA16F;
 370       break;
 371    default:
 372       _mesa_problem(NULL,
 373                     "Unexpected format %s in st_new_renderbuffer_fb",
 374                     util_format_name(format));
 375       free(strb);
 376       return NULL;
 377    }
 378
 379    /* st-specific methods */
 380    strb->Base.Delete = st_renderbuffer_delete;
 381    strb->Base.AllocStorage = st_renderbuffer_alloc_storage;
 382
 383    /* surface is allocated in st_renderbuffer_alloc_storage() */
 384    strb->surface = NULL;
 385
 386    return &strb->Base;
 387 }
 388
 389
 390 /**
 391  * Called via ctx->Driver.BindFramebufferEXT().
 392  */
 393 static void
 394 st_bind_framebuffer(struct gl_context *ctx, GLenum target,
 395                     struct gl_framebuffer *fb, struct gl_framebuffer *fbread)
 396 {
 397    /* no-op */
 398 }
 399
 400
 401 /**
 402  * Create or update the pipe_surface of a FBO renderbuffer.
 403  * This is usually called after st_finalize_texture.
 404  */
 405 void
 406 st_update_renderbuffer_surface(struct st_context *st,
 407                                struct st_renderbuffer *strb)
 408 {
 409    struct pipe_context *pipe = st->pipe;
 410    struct pipe_resource *resource = strb->texture;
 411    unsigned rtt_width = strb->Base.Width;
 412    unsigned rtt_height = strb->Base.Height;
 413    unsigned rtt_depth = strb->Base.Depth;
 414    /*
 415     * For winsys fbo, it is possible that the renderbuffer is sRGB-capable but
 416     * the format of strb->texture is linear (because we have no control over
 417     * the format).  Check strb->Base.Format instead of strb->texture->format
 418     * to determine if the rb is sRGB-capable.
 419     */
 420    boolean enable_srgb = (st->ctx->Color.sRGBEnabled &&
 421          _mesa_get_format_color_encoding(strb->Base.Format) == GL_SRGB);
 422    enum pipe_format format = (enable_srgb) ?
 423       util_format_srgb(resource->format) :
 424       util_format_linear(resource->format);
 425    unsigned first_layer, last_layer, level;
 426
 427    if (resource->target == PIPE_TEXTURE_1D_ARRAY) {
 428       rtt_depth = rtt_height;
 429       rtt_height = 1;
 430    }
 431
 432    /* find matching mipmap level size */
 433    for (level = 0; level <= resource->last_level; level++) {
 434       if (u_minify(resource->width0, level) == rtt_width &&
 435           u_minify(resource->height0, level) == rtt_height &&
 436           (resource->target != PIPE_TEXTURE_3D ||
 437            u_minify(resource->depth0, level) == rtt_depth)) {
 438          break;
 439       }
 440    }
 441    assert(level <= resource->last_level);
 442
 443    /* determine the layer bounds */
 444    if (strb->rtt_layered) {
 445       first_layer = 0;
 446       last_layer = util_max_layer(strb->texture, level);
 447    }
 448    else {
 449       first_layer =
 450       last_layer = strb->rtt_face + strb->rtt_slice;
 451    }
 452
 453    /* Adjust for texture views */
 454    if (strb->is_rtt && resource->array_size > 1 &&
 455        strb->Base.TexImage->TexObject->Immutable) {
 456       struct gl_texture_object *tex = strb->Base.TexImage->TexObject;
 457       first_layer += tex->MinLayer;
 458       if (!strb->rtt_layered)
 459          last_layer += tex->MinLayer;
 460       else
 461          last_layer = MIN2(first_layer + tex->NumLayers - 1, last_layer);
 462    }
 463
 464    if (!strb->surface ||
 465        strb->surface->texture->nr_samples != strb->Base.NumSamples ||
 466        strb->surface->format != format ||
 467        strb->surface->texture != resource ||
 468        strb->surface->width != rtt_width ||
 469        strb->surface->height != rtt_height ||
 470        strb->surface->u.tex.level != level ||
 471        strb->surface->u.tex.first_layer != first_layer ||
 472        strb->surface->u.tex.last_layer != last_layer) {
 473       /* create a new pipe_surface */
 474       struct pipe_surface surf_tmpl;
 475       memset(&surf_tmpl, 0, sizeof(surf_tmpl));
 476       surf_tmpl.format = format;
 477       surf_tmpl.u.tex.level = level;
 478       surf_tmpl.u.tex.first_layer = first_layer;
 479       surf_tmpl.u.tex.last_layer = last_layer;
 480
 481       pipe_surface_reference(&strb->surface, NULL);
 482
 483       strb->surface = pipe->create_surface(pipe, resource, &surf_tmpl);
 484    }
 485 }
 486
 487 /**
 488  * Called by ctx->Driver.RenderTexture
 489  */
 490 static void
 491 st_render_texture(struct gl_context *ctx,
 492                   struct gl_framebuffer *fb,
 493                   struct gl_renderbuffer_attachment *att)
 494 {
 495    struct st_context *st = st_context(ctx);
 496    struct pipe_context *pipe = st->pipe;
 497    struct gl_renderbuffer *rb = att->Renderbuffer;
 498    struct st_renderbuffer *strb = st_renderbuffer(rb);
 499    struct pipe_resource *pt;
 500
 501    if (!st_finalize_texture(ctx, pipe, att->Texture))
 502       return;
 503
 504    pt = st_get_texobj_resource(att->Texture);
 505    assert(pt);
 506
 507    /* point renderbuffer at texobject */
 508    strb->is_rtt = TRUE;
 509    strb->rtt_face = att->CubeMapFace;
 510    strb->rtt_slice = att->Zoffset;
 511    strb->rtt_layered = att->Layered;
 512    pipe_resource_reference(&strb->texture, pt);
 513
 514    pipe_surface_release(pipe, &strb->surface);
 515
 516    st_update_renderbuffer_surface(st, strb);
 517
 518    strb->Base.Format = st_pipe_format_to_mesa_format(pt->format);
 519
 520    /* Invalidate buffer state so that the pipe's framebuffer state
 521     * gets updated.
 522     * That's where the new renderbuffer (which we just created) gets
 523     * passed to the pipe as a (color/depth) render target.
 524     */
 525    st_invalidate_state(ctx, _NEW_BUFFERS);
 526
 527
 528    /* Need to trigger a call to update_framebuffer() since we just
 529     * attached a new renderbuffer.
 530     */
 531    ctx->NewState |= _NEW_BUFFERS;
 532 }
 533
 534
 535 /**
 536  * Called via ctx->Driver.FinishRenderTexture.
 537  */
 538 static void
 539 st_finish_render_texture(struct gl_context *ctx, struct gl_renderbuffer *rb)
 540 {
 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_state(ctx, _NEW_BUFFERS);
 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,
 657                                screen,
 658                                depth,
 659                                PIPE_BIND_DEPTH_STENCIL)) {
 660       fb->_Status = GL_FRAMEBUFFER_UNSUPPORTED_EXT;
 661       return;
 662    }
 663    if (!st_validate_attachment(ctx,
 664                                screen,
 665                                stencil,
 666                                PIPE_BIND_DEPTH_STENCIL)) {
 667       fb->_Status = GL_FRAMEBUFFER_UNSUPPORTED_EXT;
 668       return;
 669    }
 670    for (i = 0; i < ctx->Const.MaxColorAttachments; i++) {
 671       struct gl_renderbuffer_attachment *att =
 672             &fb->Attachment[BUFFER_COLOR0 + i];
 673       enum pipe_format format;
 674
 675       if (!st_validate_attachment(ctx,
 676                                   screen,
 677                                   att,
 678                                   PIPE_BIND_RENDER_TARGET)) {
 679          fb->_Status = GL_FRAMEBUFFER_UNSUPPORTED_EXT;
 680          return;
 681       }
 682
 683       if (!mixed_formats) {
 684          /* Disallow mixed formats. */
 685          if (att->Type != GL_NONE) {
 686             format = st_renderbuffer(att->Renderbuffer)->surface->format;
 687          } else {
 688             continue;
 689          }
 690
 691          if (first_format == PIPE_FORMAT_NONE) {
 692             first_format = format;
 693          } else if (format != first_format) {
 694             fb->_Status = GL_FRAMEBUFFER_UNSUPPORTED_EXT;
 695             st_fbo_invalid("Mixed color formats");
 696             return;
 697          }
 698       }
 699    }
 700 }
 701
 702
 703 /**
 704  * Called via glDrawBuffer.
 705  */
 706 static void
 707 st_DrawBuffers(struct gl_context *ctx, GLsizei count, const GLenum *buffers)
 708 {
 709    struct st_context *st = st_context(ctx);
 710    struct gl_framebuffer *fb = ctx->DrawBuffer;
 711    GLuint i;
 712
 713    (void) count;
 714    (void) buffers;
 715
 716    /* add the renderbuffers on demand */
 717    for (i = 0; i < fb->_NumColorDrawBuffers; i++) {
 718       gl_buffer_index 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  * Called via glReadBuffer.
 729  */
 730 static void
 731 st_ReadBuffer(struct gl_context *ctx, GLenum buffer)
 732 {
 733    struct st_context *st = st_context(ctx);
 734    struct gl_framebuffer *fb = ctx->ReadBuffer;
 735
 736    (void) buffer;
 737
 738    /* add the renderbuffer on demand */
 739    if (fb->_ColorReadBufferIndex >= 0)
 740       st_manager_add_color_renderbuffer(st, fb, fb->_ColorReadBufferIndex);
 741 }
 742
 743
 744
 745 /**
 746  * Called via ctx->Driver.MapRenderbuffer.
 747  */
 748 static void
 749 st_MapRenderbuffer(struct gl_context *ctx,
 750                    struct gl_renderbuffer *rb,
 751                    GLuint x, GLuint y, GLuint w, GLuint h,
 752                    GLbitfield mode,
 753                    GLubyte **mapOut, GLint *rowStrideOut)
 754 {
 755    struct st_context *st = st_context(ctx);
 756    struct st_renderbuffer *strb = st_renderbuffer(rb);
 757    struct pipe_context *pipe = st->pipe;
 758    const GLboolean invert = rb->Name == 0;
 759    unsigned usage;
 760    GLuint y2;
 761    GLubyte *map;
 762
 763    if (strb->software) {
 764       /* software-allocated renderbuffer (probably an accum buffer) */
 765       if (strb->data) {
 766          GLint bpp = _mesa_get_format_bytes(strb->Base.Format);
 767          GLint stride = _mesa_format_row_stride(strb->Base.Format,
 768                                                 strb->Base.Width);
 769          *mapOut = (GLubyte *) strb->data + y * stride + x * bpp;
 770          *rowStrideOut = stride;
 771       }
 772       else {
 773          *mapOut = NULL;
 774          *rowStrideOut = 0;
 775       }
 776       return;
 777    }
 778
 779    usage = 0x0;
 780    if (mode & GL_MAP_READ_BIT)
 781       usage |= PIPE_TRANSFER_READ;
 782    if (mode & GL_MAP_WRITE_BIT)
 783       usage |= PIPE_TRANSFER_WRITE;
 784    if (mode & GL_MAP_INVALIDATE_RANGE_BIT)
 785       usage |= PIPE_TRANSFER_DISCARD_RANGE;
 786
 787    /* Note: y=0=bottom of buffer while y2=0=top of buffer.
 788     * 'invert' will be true for window-system buffers and false for
 789     * user-allocated renderbuffers and textures.
 790     */
 791    if (invert)
 792       y2 = strb->Base.Height - y - h;
 793    else
 794       y2 = y;
 795
 796     map = pipe_transfer_map(pipe,
 797                             strb->texture,
 798                             strb->surface->u.tex.level,
 799                             strb->surface->u.tex.first_layer,
 800                             usage, x, y2, w, h, &strb->transfer);
 801    if (map) {
 802       if (invert) {
 803          *rowStrideOut = -(int) strb->transfer->stride;
 804          map += (h - 1) * strb->transfer->stride;
 805       }
 806       else {
 807          *rowStrideOut = strb->transfer->stride;
 808       }
 809       *mapOut = map;
 810    }
 811    else {
 812       *mapOut = NULL;
 813       *rowStrideOut = 0;
 814    }
 815 }
 816
 817
 818 /**
 819  * Called via ctx->Driver.UnmapRenderbuffer.
 820  */
 821 static void
 822 st_UnmapRenderbuffer(struct gl_context *ctx,
 823                      struct gl_renderbuffer *rb)
 824 {
 825    struct st_context *st = st_context(ctx);
 826    struct st_renderbuffer *strb = st_renderbuffer(rb);
 827    struct pipe_context *pipe = st->pipe;
 828
 829    if (strb->software) {
 830       /* software-allocated renderbuffer (probably an accum buffer) */
 831       return;
 832    }
 833
 834    pipe_transfer_unmap(pipe, strb->transfer);
 835    strb->transfer = NULL;
 836 }
 837
 838
 839
 840 void st_init_fbo_functions(struct dd_function_table *functions)
 841 {
 842    functions->NewFramebuffer = st_new_framebuffer;
 843    functions->NewRenderbuffer = st_new_renderbuffer;
 844    functions->BindFramebuffer = st_bind_framebuffer;
 845    functions->FramebufferRenderbuffer = _mesa_FramebufferRenderbuffer_sw;
 846    functions->RenderTexture = st_render_texture;
 847    functions->FinishRenderTexture = st_finish_render_texture;
 848    functions->ValidateFramebuffer = st_validate_framebuffer;
 849
 850    functions->DrawBuffers = st_DrawBuffers;
 851    functions->ReadBuffer = st_ReadBuffer;
 852
 853    functions->MapRenderbuffer = st_MapRenderbuffer;
 854    functions->UnmapRenderbuffer = st_UnmapRenderbuffer;
 855 }
 856
 857