src/mesa/state_tracker/st_cb_fbo.c

   1 /**************************************************************************
   2  *
   3  * Copyright 2007 Tungsten Graphics, Inc., Cedar Park, Texas.
   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 TUNGSTEN GRAPHICS 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/macros.h"
  41 #include "main/renderbuffer.h"
  42
  43 #include "pipe/p_context.h"
  44 #include "pipe/p_defines.h"
  45 #include "pipe/p_screen.h"
  46 #include "st_context.h"
  47 #include "st_cb_fbo.h"
  48 #include "st_cb_flush.h"
  49 #include "st_cb_texture.h"
  50 #include "st_format.h"
  51 #include "st_texture.h"
  52 #include "st_manager.h"
  53
  54 #include "util/u_format.h"
  55 #include "util/u_inlines.h"
  56 #include "util/u_surface.h"
  57
  58
  59 static GLboolean
  60 st_renderbuffer_alloc_sw_storage(struct gl_context * ctx,
  61                                  struct gl_renderbuffer *rb,
  62                                  GLenum internalFormat,
  63                                  GLuint width, GLuint height)
  64 {
  65    struct st_context *st = st_context(ctx);
  66    struct st_renderbuffer *strb = st_renderbuffer(rb);
  67    enum pipe_format format;
  68    size_t size;
  69
  70    free(strb->data);
  71    strb->data = NULL;
  72
  73    if (internalFormat == GL_RGBA16_SNORM) {
  74       /* Special case for software accum buffers.  Otherwise, if the
  75        * call to st_choose_renderbuffer_format() fails (because the
  76        * driver doesn't support signed 16-bit/channel colors) we'd
  77        * just return without allocating the software accum buffer.
  78        */
  79       format = PIPE_FORMAT_R16G16B16A16_SNORM;
  80    }
  81    else {
  82       format = st_choose_renderbuffer_format(st, internalFormat, 0);
  83
  84       /* Not setting gl_renderbuffer::Format here will cause
  85        * FRAMEBUFFER_UNSUPPORTED and ValidateFramebuffer will not be called.
  86        */
  87       if (format == PIPE_FORMAT_NONE) {
  88          return GL_TRUE;
  89       }
  90    }
  91
  92    strb->Base.Format = st_pipe_format_to_mesa_format(format);
  93
  94    size = _mesa_format_image_size(strb->Base.Format, width, height, 1);
  95    strb->data = malloc(size);
  96    return strb->data != NULL;
  97 }
  98
  99
 100 /**
 101  * gl_renderbuffer::AllocStorage()
 102  * This is called to allocate the original drawing surface, and
 103  * during window resize.
 104  */
 105 static GLboolean
 106 st_renderbuffer_alloc_storage(struct gl_context * ctx,
 107                               struct gl_renderbuffer *rb,
 108                               GLenum internalFormat,
 109                               GLuint width, GLuint height)
 110 {
 111    struct st_context *st = st_context(ctx);
 112    struct pipe_context *pipe = st->pipe;
 113    struct pipe_screen *screen = st->pipe->screen;
 114    struct st_renderbuffer *strb = st_renderbuffer(rb);
 115    enum pipe_format format = PIPE_FORMAT_NONE;
 116    struct pipe_surface surf_tmpl;
 117    struct pipe_resource templ;
 118
 119    /* init renderbuffer fields */
 120    strb->Base.Width  = width;
 121    strb->Base.Height = height;
 122    strb->Base._BaseFormat = _mesa_base_fbo_format(ctx, internalFormat);
 123    strb->defined = GL_FALSE;  /* undefined contents now */
 124
 125    if (strb->software) {
 126       return st_renderbuffer_alloc_sw_storage(ctx, rb, internalFormat,
 127                                               width, height);
 128    }
 129
 130    /* Free the old surface and texture
 131     */
 132    pipe_surface_reference( &strb->surface, NULL );
 133    pipe_resource_reference( &strb->texture, NULL );
 134
 135    /* Handle multisample renderbuffers first.
 136     *
 137     * From ARB_framebuffer_object:
 138     *   If <samples> is zero, then RENDERBUFFER_SAMPLES is set to zero.
 139     *   Otherwise <samples> represents a request for a desired minimum
 140     *   number of samples. Since different implementations may support
 141     *   different sample counts for multisampled rendering, the actual
 142     *   number of samples allocated for the renderbuffer image is
 143     *   implementation dependent.  However, the resulting value for
 144     *   RENDERBUFFER_SAMPLES is guaranteed to be greater than or equal
 145     *   to <samples> and no more than the next larger sample count supported
 146     *   by the implementation.
 147     *
 148     * So let's find the supported number of samples closest to NumSamples.
 149     * (NumSamples == 1) is treated the same as (NumSamples == 0).
 150     */
 151    if (rb->NumSamples > 1) {
 152       unsigned i;
 153
 154       for (i = rb->NumSamples; i <= ctx->Const.MaxSamples; i++) {
 155          format = st_choose_renderbuffer_format(st, internalFormat, i);
 156
 157          if (format != PIPE_FORMAT_NONE) {
 158             rb->NumSamples = i;
 159             break;
 160          }
 161       }
 162    } else {
 163       format = st_choose_renderbuffer_format(st, internalFormat, 0);
 164    }
 165
 166    /* Not setting gl_renderbuffer::Format here will cause
 167     * FRAMEBUFFER_UNSUPPORTED and ValidateFramebuffer will not be called.
 168     */
 169    if (format == PIPE_FORMAT_NONE) {
 170       return GL_TRUE;
 171    }
 172
 173    strb->Base.Format = st_pipe_format_to_mesa_format(format);
 174
 175    if (width == 0 || height == 0) {
 176       /* if size is zero, nothing to allocate */
 177       return GL_TRUE;
 178    }
 179
 180    /* Setup new texture template.
 181     */
 182    memset(&templ, 0, sizeof(templ));
 183    templ.target = st->internal_target;
 184    templ.format = format;
 185    templ.width0 = width;
 186    templ.height0 = height;
 187    templ.depth0 = 1;
 188    templ.array_size = 1;
 189    templ.nr_samples = rb->NumSamples;
 190    if (util_format_is_depth_or_stencil(format)) {
 191       templ.bind = PIPE_BIND_DEPTH_STENCIL;
 192    }
 193    else if (strb->Base.Name != 0) {
 194       /* this is a user-created renderbuffer */
 195       templ.bind = PIPE_BIND_RENDER_TARGET;
 196    }
 197    else {
 198       /* this is a window-system buffer */
 199       templ.bind = (PIPE_BIND_DISPLAY_TARGET |
 200                     PIPE_BIND_RENDER_TARGET);
 201    }
 202
 203    strb->texture = screen->resource_create(screen, &templ);
 204
 205    if (!strb->texture)
 206       return FALSE;
 207
 208    u_surface_default_template(&surf_tmpl, strb->texture);
 209    strb->surface = pipe->create_surface(pipe,
 210                                         strb->texture,
 211                                         &surf_tmpl);
 212    if (strb->surface) {
 213       assert(strb->surface->texture);
 214       assert(strb->surface->format);
 215       assert(strb->surface->width == width);
 216       assert(strb->surface->height == height);
 217    }
 218
 219    return strb->surface != NULL;
 220 }
 221
 222
 223 /**
 224  * gl_renderbuffer::Delete()
 225  */
 226 static void
 227 st_renderbuffer_delete(struct gl_context *ctx, struct gl_renderbuffer *rb)
 228 {
 229    struct st_renderbuffer *strb = st_renderbuffer(rb);
 230    if (ctx) {
 231       struct st_context *st = st_context(ctx);
 232       pipe_surface_release(st->pipe, &strb->surface);
 233    }
 234    pipe_resource_reference(&strb->texture, NULL);
 235    free(strb->data);
 236    _mesa_delete_renderbuffer(ctx, rb);
 237 }
 238
 239
 240 /**
 241  * Called via ctx->Driver.NewFramebuffer()
 242  */
 243 static struct gl_framebuffer *
 244 st_new_framebuffer(struct gl_context *ctx, GLuint name)
 245 {
 246    /* XXX not sure we need to subclass gl_framebuffer for pipe */
 247    return _mesa_new_framebuffer(ctx, name);
 248 }
 249
 250
 251 /**
 252  * Called via ctx->Driver.NewRenderbuffer()
 253  */
 254 static struct gl_renderbuffer *
 255 st_new_renderbuffer(struct gl_context *ctx, GLuint name)
 256 {
 257    struct st_renderbuffer *strb = ST_CALLOC_STRUCT(st_renderbuffer);
 258    if (strb) {
 259       assert(name != 0);
 260       _mesa_init_renderbuffer(&strb->Base, name);
 261       strb->Base.Delete = st_renderbuffer_delete;
 262       strb->Base.AllocStorage = st_renderbuffer_alloc_storage;
 263       return &strb->Base;
 264    }
 265    return NULL;
 266 }
 267
 268
 269 /**
 270  * Allocate a renderbuffer for a an on-screen window (not a user-created
 271  * renderbuffer).  The window system code determines the format.
 272  */
 273 struct gl_renderbuffer *
 274 st_new_renderbuffer_fb(enum pipe_format format, int samples, boolean sw)
 275 {
 276    struct st_renderbuffer *strb;
 277
 278    strb = ST_CALLOC_STRUCT(st_renderbuffer);
 279    if (!strb) {
 280       _mesa_error(NULL, GL_OUT_OF_MEMORY, "creating renderbuffer");
 281       return NULL;
 282    }
 283
 284    _mesa_init_renderbuffer(&strb->Base, 0);
 285    strb->Base.ClassID = 0x4242; /* just a unique value */
 286    strb->Base.NumSamples = samples;
 287    strb->Base.Format = st_pipe_format_to_mesa_format(format);
 288    strb->Base._BaseFormat = _mesa_get_format_base_format(strb->Base.Format);
 289    strb->software = sw;
 290
 291    switch (format) {
 292    case PIPE_FORMAT_R8G8B8A8_UNORM:
 293    case PIPE_FORMAT_B8G8R8A8_UNORM:
 294    case PIPE_FORMAT_A8R8G8B8_UNORM:
 295       strb->Base.InternalFormat = GL_RGBA8;
 296       break;
 297    case PIPE_FORMAT_R8G8B8X8_UNORM:
 298    case PIPE_FORMAT_B8G8R8X8_UNORM:
 299    case PIPE_FORMAT_X8R8G8B8_UNORM:
 300       strb->Base.InternalFormat = GL_RGB8;
 301       break;
 302    case PIPE_FORMAT_B5G5R5A1_UNORM:
 303       strb->Base.InternalFormat = GL_RGB5_A1;
 304       break;
 305    case PIPE_FORMAT_B4G4R4A4_UNORM:
 306       strb->Base.InternalFormat = GL_RGBA4;
 307       break;
 308    case PIPE_FORMAT_B5G6R5_UNORM:
 309       strb->Base.InternalFormat = GL_RGB565;
 310       break;
 311    case PIPE_FORMAT_Z16_UNORM:
 312       strb->Base.InternalFormat = GL_DEPTH_COMPONENT16;
 313       break;
 314    case PIPE_FORMAT_Z32_UNORM:
 315       strb->Base.InternalFormat = GL_DEPTH_COMPONENT32;
 316       break;
 317    case PIPE_FORMAT_Z24_UNORM_S8_UINT:
 318    case PIPE_FORMAT_S8_UINT_Z24_UNORM:
 319       strb->Base.InternalFormat = GL_DEPTH24_STENCIL8_EXT;
 320       break;
 321    case PIPE_FORMAT_Z24X8_UNORM:
 322    case PIPE_FORMAT_X8Z24_UNORM:
 323       strb->Base.InternalFormat = GL_DEPTH_COMPONENT24;
 324       break;
 325    case PIPE_FORMAT_S8_UINT:
 326       strb->Base.InternalFormat = GL_STENCIL_INDEX8_EXT;
 327       break;
 328    case PIPE_FORMAT_R16G16B16A16_SNORM:
 329       /* accum buffer */
 330       strb->Base.InternalFormat = GL_RGBA16_SNORM;
 331       break;
 332    case PIPE_FORMAT_R16G16B16A16_UNORM:
 333       strb->Base.InternalFormat = GL_RGBA16;
 334       break;
 335    case PIPE_FORMAT_R8_UNORM:
 336       strb->Base.InternalFormat = GL_R8;
 337       break;
 338    case PIPE_FORMAT_R8G8_UNORM:
 339       strb->Base.InternalFormat = GL_RG8;
 340       break;
 341    case PIPE_FORMAT_R16_UNORM:
 342       strb->Base.InternalFormat = GL_R16;
 343       break;
 344    case PIPE_FORMAT_R16G16_UNORM:
 345       strb->Base.InternalFormat = GL_RG16;
 346       break;
 347    case PIPE_FORMAT_R32G32B32A32_FLOAT:
 348       strb->Base.InternalFormat = GL_RGBA32F;
 349       break;
 350    case PIPE_FORMAT_R16G16B16A16_FLOAT:
 351       strb->Base.InternalFormat = GL_RGBA16F;
 352       break;
 353    default:
 354       _mesa_problem(NULL,
 355                     "Unexpected format %s in st_new_renderbuffer_fb",
 356                     util_format_name(format));
 357       free(strb);
 358       return NULL;
 359    }
 360
 361    /* st-specific methods */
 362    strb->Base.Delete = st_renderbuffer_delete;
 363    strb->Base.AllocStorage = st_renderbuffer_alloc_storage;
 364
 365    /* surface is allocated in st_renderbuffer_alloc_storage() */
 366    strb->surface = NULL;
 367
 368    return &strb->Base;
 369 }
 370
 371
 372 /**
 373  * Called via ctx->Driver.BindFramebufferEXT().
 374  */
 375 static void
 376 st_bind_framebuffer(struct gl_context *ctx, GLenum target,
 377                     struct gl_framebuffer *fb, struct gl_framebuffer *fbread)
 378 {
 379    /* no-op */
 380 }
 381
 382
 383 /**
 384  * Called by ctx->Driver.RenderTexture
 385  */
 386 static void
 387 st_render_texture(struct gl_context *ctx,
 388                   struct gl_framebuffer *fb,
 389                   struct gl_renderbuffer_attachment *att)
 390 {
 391    struct st_context *st = st_context(ctx);
 392    struct pipe_context *pipe = st->pipe;
 393    struct gl_renderbuffer *rb = att->Renderbuffer;
 394    struct st_renderbuffer *strb = st_renderbuffer(rb);
 395    struct pipe_resource *pt;
 396    struct st_texture_object *stObj;
 397    const struct gl_texture_image *texImage;
 398    struct pipe_surface surf_tmpl;
 399
 400    if (!st_finalize_texture(ctx, pipe, att->Texture))
 401       return;
 402
 403    pt = st_get_texobj_resource(att->Texture);
 404    assert(pt);
 405
 406    /* get pointer to texture image we're rendeing to */
 407    texImage = _mesa_get_attachment_teximage(att);
 408
 409    /* get the texture for the texture object */
 410    stObj = st_texture_object(att->Texture);
 411
 412    /* point renderbuffer at texobject */
 413    strb->rtt = stObj;
 414    strb->rtt_level = att->TextureLevel;
 415    strb->rtt_face = att->CubeMapFace;
 416    strb->rtt_slice = att->Zoffset;
 417    rb->NumSamples = texImage->NumSamples;
 418    rb->Width = texImage->Width2;
 419    rb->Height = texImage->Height2;
 420    rb->_BaseFormat = texImage->_BaseFormat;
 421    rb->InternalFormat = texImage->InternalFormat;
 422
 423    pipe_resource_reference( &strb->texture, pt );
 424
 425    pipe_surface_release(pipe, &strb->surface);
 426
 427    assert(strb->rtt_level <= strb->texture->last_level);
 428
 429    /* new surface for rendering into the texture */
 430    memset(&surf_tmpl, 0, sizeof(surf_tmpl));
 431    surf_tmpl.format = ctx->Color.sRGBEnabled
 432       ? strb->texture->format : util_format_linear(strb->texture->format);
 433    surf_tmpl.u.tex.level = strb->rtt_level;
 434    surf_tmpl.u.tex.first_layer = strb->rtt_face + strb->rtt_slice;
 435    surf_tmpl.u.tex.last_layer = strb->rtt_face + strb->rtt_slice;
 436    strb->surface = pipe->create_surface(pipe,
 437                                         strb->texture,
 438                                         &surf_tmpl);
 439
 440    strb->Base.Format = st_pipe_format_to_mesa_format(pt->format);
 441
 442    /* Invalidate buffer state so that the pipe's framebuffer state
 443     * gets updated.
 444     * That's where the new renderbuffer (which we just created) gets
 445     * passed to the pipe as a (color/depth) render target.
 446     */
 447    st_invalidate_state(ctx, _NEW_BUFFERS);
 448
 449
 450    /* Need to trigger a call to update_framebuffer() since we just
 451     * attached a new renderbuffer.
 452     */
 453    ctx->NewState |= _NEW_BUFFERS;
 454 }
 455
 456
 457 /**
 458  * Called via ctx->Driver.FinishRenderTexture.
 459  */
 460 static void
 461 st_finish_render_texture(struct gl_context *ctx,
 462                          struct gl_renderbuffer_attachment *att)
 463 {
 464    struct st_renderbuffer *strb = st_renderbuffer(att->Renderbuffer);
 465
 466    if (!strb)
 467       return;
 468
 469    strb->rtt = NULL;
 470
 471    /* restore previous framebuffer state */
 472    st_invalidate_state(ctx, _NEW_BUFFERS);
 473 }
 474
 475
 476 /** Debug helper */
 477 static void
 478 st_fbo_invalid(const char *reason)
 479 {
 480    if (MESA_DEBUG_FLAGS & DEBUG_INCOMPLETE_FBO) {
 481       _mesa_debug(NULL, "Invalid FBO: %s\n", reason);
 482    }
 483 }
 484
 485
 486 /**
 487  * Validate a renderbuffer attachment for a particular set of bindings.
 488  */
 489 static GLboolean
 490 st_validate_attachment(struct gl_context *ctx,
 491                        struct pipe_screen *screen,
 492                        const struct gl_renderbuffer_attachment *att,
 493                        unsigned bindings)
 494 {
 495    const struct st_texture_object *stObj = st_texture_object(att->Texture);
 496    enum pipe_format format;
 497    gl_format texFormat;
 498    GLboolean valid;
 499
 500    /* Only validate texture attachments for now, since
 501     * st_renderbuffer_alloc_storage makes sure that
 502     * the format is supported.
 503     */
 504    if (att->Type != GL_TEXTURE)
 505       return GL_TRUE;
 506
 507    if (!stObj)
 508       return GL_FALSE;
 509
 510    format = stObj->pt->format;
 511    texFormat = _mesa_get_attachment_teximage_const(att)->TexFormat;
 512
 513    /* If the encoding is sRGB and sRGB rendering cannot be enabled,
 514     * check for linear format support instead.
 515     * Later when we create a surface, we change the format to a linear one. */
 516    if (!ctx->Extensions.EXT_framebuffer_sRGB &&
 517        _mesa_get_format_color_encoding(texFormat) == GL_SRGB) {
 518       const gl_format linearFormat = _mesa_get_srgb_format_linear(texFormat);
 519       format = st_mesa_format_to_pipe_format(linearFormat);
 520    }
 521
 522    valid = screen->is_format_supported(screen, format,
 523                                       PIPE_TEXTURE_2D,
 524                                       stObj->pt->nr_samples, bindings);
 525    if (!valid) {
 526       st_fbo_invalid("Invalid format");
 527    }
 528
 529    return valid;
 530 }
 531
 532
 533 /**
 534  * Check that the framebuffer configuration is valid in terms of what
 535  * the driver can support.
 536  *
 537  * For Gallium we only supports combined Z+stencil, not separate buffers.
 538  */
 539 static void
 540 st_validate_framebuffer(struct gl_context *ctx, struct gl_framebuffer *fb)
 541 {
 542    struct st_context *st = st_context(ctx);
 543    struct pipe_screen *screen = st->pipe->screen;
 544    const struct gl_renderbuffer_attachment *depth =
 545          &fb->Attachment[BUFFER_DEPTH];
 546    const struct gl_renderbuffer_attachment *stencil =
 547          &fb->Attachment[BUFFER_STENCIL];
 548    GLuint i;
 549    enum pipe_format first_format = PIPE_FORMAT_NONE;
 550    boolean mixed_formats =
 551          screen->get_param(screen, PIPE_CAP_MIXED_COLORBUFFER_FORMATS) != 0;
 552
 553    if (depth->Type && stencil->Type && depth->Type != stencil->Type) {
 554       st_fbo_invalid("Different Depth/Stencil buffer formats");
 555       fb->_Status = GL_FRAMEBUFFER_UNSUPPORTED_EXT;
 556       return;
 557    }
 558    if (depth->Type == GL_RENDERBUFFER_EXT &&
 559        stencil->Type == GL_RENDERBUFFER_EXT &&
 560        depth->Renderbuffer != stencil->Renderbuffer) {
 561       st_fbo_invalid("Separate Depth/Stencil buffers");
 562       fb->_Status = GL_FRAMEBUFFER_UNSUPPORTED_EXT;
 563       return;
 564    }
 565    if (depth->Type == GL_TEXTURE &&
 566        stencil->Type == GL_TEXTURE &&
 567        depth->Texture != stencil->Texture) {
 568       fb->_Status = GL_FRAMEBUFFER_UNSUPPORTED_EXT;
 569       st_fbo_invalid("Different Depth/Stencil textures");
 570       return;
 571    }
 572
 573    if (!st_validate_attachment(ctx,
 574                                screen,
 575                                depth,
 576                                PIPE_BIND_DEPTH_STENCIL)) {
 577       fb->_Status = GL_FRAMEBUFFER_UNSUPPORTED_EXT;
 578       return;
 579    }
 580    if (!st_validate_attachment(ctx,
 581                                screen,
 582                                stencil,
 583                                PIPE_BIND_DEPTH_STENCIL)) {
 584       fb->_Status = GL_FRAMEBUFFER_UNSUPPORTED_EXT;
 585       return;
 586    }
 587    for (i = 0; i < ctx->Const.MaxColorAttachments; i++) {
 588       struct gl_renderbuffer_attachment *att =
 589             &fb->Attachment[BUFFER_COLOR0 + i];
 590       enum pipe_format format;
 591
 592       if (!st_validate_attachment(ctx,
 593                                   screen,
 594                                   att,
 595                                   PIPE_BIND_RENDER_TARGET)) {
 596          fb->_Status = GL_FRAMEBUFFER_UNSUPPORTED_EXT;
 597          return;
 598       }
 599
 600       if (!mixed_formats) {
 601          /* Disallow mixed formats. */
 602          if (att->Type != GL_NONE) {
 603             format = st_renderbuffer(att->Renderbuffer)->surface->format;
 604          } else {
 605             continue;
 606          }
 607
 608          if (first_format == PIPE_FORMAT_NONE) {
 609             first_format = format;
 610          } else if (format != first_format) {
 611             fb->_Status = GL_FRAMEBUFFER_UNSUPPORTED_EXT;
 612             st_fbo_invalid("Mixed color formats");
 613             return;
 614          }
 615       }
 616    }
 617 }
 618
 619
 620 /**
 621  * Called via glDrawBuffer.
 622  */
 623 static void
 624 st_DrawBuffers(struct gl_context *ctx, GLsizei count, const GLenum *buffers)
 625 {
 626    struct st_context *st = st_context(ctx);
 627    struct gl_framebuffer *fb = ctx->DrawBuffer;
 628    GLuint i;
 629
 630    (void) count;
 631    (void) buffers;
 632
 633    /* add the renderbuffers on demand */
 634    for (i = 0; i < fb->_NumColorDrawBuffers; i++) {
 635       gl_buffer_index idx = fb->_ColorDrawBufferIndexes[i];
 636       st_manager_add_color_renderbuffer(st, fb, idx);
 637    }
 638 }
 639
 640
 641 /**
 642  * Called via glReadBuffer.
 643  */
 644 static void
 645 st_ReadBuffer(struct gl_context *ctx, GLenum buffer)
 646 {
 647    struct st_context *st = st_context(ctx);
 648    struct gl_framebuffer *fb = ctx->ReadBuffer;
 649
 650    (void) buffer;
 651
 652    /* add the renderbuffer on demand */
 653    st_manager_add_color_renderbuffer(st, fb, fb->_ColorReadBufferIndex);
 654 }
 655
 656
 657
 658 /**
 659  * Called via ctx->Driver.MapRenderbuffer.
 660  */
 661 static void
 662 st_MapRenderbuffer(struct gl_context *ctx,
 663                    struct gl_renderbuffer *rb,
 664                    GLuint x, GLuint y, GLuint w, GLuint h,
 665                    GLbitfield mode,
 666                    GLubyte **mapOut, GLint *rowStrideOut)
 667 {
 668    struct st_context *st = st_context(ctx);
 669    struct st_renderbuffer *strb = st_renderbuffer(rb);
 670    struct pipe_context *pipe = st->pipe;
 671    const GLboolean invert = rb->Name == 0;
 672    unsigned usage;
 673    GLuint y2;
 674    GLubyte *map;
 675
 676    if (strb->software) {
 677       /* software-allocated renderbuffer (probably an accum buffer) */
 678       if (strb->data) {
 679          GLint bpp = _mesa_get_format_bytes(strb->Base.Format);
 680          GLint stride = _mesa_format_row_stride(strb->Base.Format,
 681                                                 strb->Base.Width);
 682          *mapOut = (GLubyte *) strb->data + y * stride + x * bpp;
 683          *rowStrideOut = stride;
 684       }
 685       else {
 686          *mapOut = NULL;
 687          *rowStrideOut = 0;
 688       }
 689       return;
 690    }
 691
 692    usage = 0x0;
 693    if (mode & GL_MAP_READ_BIT)
 694       usage |= PIPE_TRANSFER_READ;
 695    if (mode & GL_MAP_WRITE_BIT)
 696       usage |= PIPE_TRANSFER_WRITE;
 697    if (mode & GL_MAP_INVALIDATE_RANGE_BIT)
 698       usage |= PIPE_TRANSFER_DISCARD_RANGE;
 699
 700    /* Note: y=0=bottom of buffer while y2=0=top of buffer.
 701     * 'invert' will be true for window-system buffers and false for
 702     * user-allocated renderbuffers and textures.
 703     */
 704    if (invert)
 705       y2 = strb->Base.Height - y - h;
 706    else
 707       y2 = y;
 708
 709     map = pipe_transfer_map(pipe,
 710                             strb->texture,
 711                             strb->rtt_level,
 712                             strb->rtt_face + strb->rtt_slice,
 713                             usage, x, y2, w, h, &strb->transfer);
 714    if (map) {
 715       if (invert) {
 716          *rowStrideOut = -(int) strb->transfer->stride;
 717          map += (h - 1) * strb->transfer->stride;
 718       }
 719       else {
 720          *rowStrideOut = strb->transfer->stride;
 721       }
 722       *mapOut = map;
 723    }
 724    else {
 725       *mapOut = NULL;
 726       *rowStrideOut = 0;
 727    }
 728 }
 729
 730
 731 /**
 732  * Called via ctx->Driver.UnmapRenderbuffer.
 733  */
 734 static void
 735 st_UnmapRenderbuffer(struct gl_context *ctx,
 736                      struct gl_renderbuffer *rb)
 737 {
 738    struct st_context *st = st_context(ctx);
 739    struct st_renderbuffer *strb = st_renderbuffer(rb);
 740    struct pipe_context *pipe = st->pipe;
 741
 742    if (strb->software) {
 743       /* software-allocated renderbuffer (probably an accum buffer) */
 744       return;
 745    }
 746
 747    pipe_transfer_unmap(pipe, strb->transfer);
 748    strb->transfer = NULL;
 749 }
 750
 751
 752
 753 void st_init_fbo_functions(struct dd_function_table *functions)
 754 {
 755    functions->NewFramebuffer = st_new_framebuffer;
 756    functions->NewRenderbuffer = st_new_renderbuffer;
 757    functions->BindFramebuffer = st_bind_framebuffer;
 758    functions->FramebufferRenderbuffer = _mesa_framebuffer_renderbuffer;
 759    functions->RenderTexture = st_render_texture;
 760    functions->FinishRenderTexture = st_finish_render_texture;
 761    functions->ValidateFramebuffer = st_validate_framebuffer;
 762
 763    functions->DrawBuffers = st_DrawBuffers;
 764    functions->ReadBuffer = st_ReadBuffer;
 765
 766    functions->MapRenderbuffer = st_MapRenderbuffer;
 767    functions->UnmapRenderbuffer = st_UnmapRenderbuffer;
 768 }
 769
 770