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/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_B5G5R5A1_UNORM:
 311       strb->Base.InternalFormat = GL_RGB5_A1;
 312       break;
 313    case PIPE_FORMAT_B4G4R4A4_UNORM:
 314       strb->Base.InternalFormat = GL_RGBA4;
 315       break;
 316    case PIPE_FORMAT_B5G6R5_UNORM:
 317       strb->Base.InternalFormat = GL_RGB565;
 318       break;
 319    case PIPE_FORMAT_Z16_UNORM:
 320       strb->Base.InternalFormat = GL_DEPTH_COMPONENT16;
 321       break;
 322    case PIPE_FORMAT_Z32_UNORM:
 323       strb->Base.InternalFormat = GL_DEPTH_COMPONENT32;
 324       break;
 325    case PIPE_FORMAT_Z24_UNORM_S8_UINT:
 326    case PIPE_FORMAT_S8_UINT_Z24_UNORM:
 327       strb->Base.InternalFormat = GL_DEPTH24_STENCIL8_EXT;
 328       break;
 329    case PIPE_FORMAT_Z24X8_UNORM:
 330    case PIPE_FORMAT_X8Z24_UNORM:
 331       strb->Base.InternalFormat = GL_DEPTH_COMPONENT24;
 332       break;
 333    case PIPE_FORMAT_S8_UINT:
 334       strb->Base.InternalFormat = GL_STENCIL_INDEX8_EXT;
 335       break;
 336    case PIPE_FORMAT_R16G16B16A16_SNORM:
 337       /* accum buffer */
 338       strb->Base.InternalFormat = GL_RGBA16_SNORM;
 339       break;
 340    case PIPE_FORMAT_R16G16B16A16_UNORM:
 341       strb->Base.InternalFormat = GL_RGBA16;
 342       break;
 343    case PIPE_FORMAT_R8_UNORM:
 344       strb->Base.InternalFormat = GL_R8;
 345       break;
 346    case PIPE_FORMAT_R8G8_UNORM:
 347       strb->Base.InternalFormat = GL_RG8;
 348       break;
 349    case PIPE_FORMAT_R16_UNORM:
 350       strb->Base.InternalFormat = GL_R16;
 351       break;
 352    case PIPE_FORMAT_R16G16_UNORM:
 353       strb->Base.InternalFormat = GL_RG16;
 354       break;
 355    case PIPE_FORMAT_R32G32B32A32_FLOAT:
 356       strb->Base.InternalFormat = GL_RGBA32F;
 357       break;
 358    case PIPE_FORMAT_R16G16B16A16_FLOAT:
 359       strb->Base.InternalFormat = GL_RGBA16F;
 360       break;
 361    default:
 362       _mesa_problem(NULL,
 363                     "Unexpected format %s in st_new_renderbuffer_fb",
 364                     util_format_name(format));
 365       free(strb);
 366       return NULL;
 367    }
 368
 369    /* st-specific methods */
 370    strb->Base.Delete = st_renderbuffer_delete;
 371    strb->Base.AllocStorage = st_renderbuffer_alloc_storage;
 372
 373    /* surface is allocated in st_renderbuffer_alloc_storage() */
 374    strb->surface = NULL;
 375
 376    return &strb->Base;
 377 }
 378
 379
 380 /**
 381  * Called via ctx->Driver.BindFramebufferEXT().
 382  */
 383 static void
 384 st_bind_framebuffer(struct gl_context *ctx, GLenum target,
 385                     struct gl_framebuffer *fb, struct gl_framebuffer *fbread)
 386 {
 387    /* no-op */
 388 }
 389
 390
 391 /**
 392  * Called by ctx->Driver.RenderTexture
 393  */
 394 static void
 395 st_render_texture(struct gl_context *ctx,
 396                   struct gl_framebuffer *fb,
 397                   struct gl_renderbuffer_attachment *att)
 398 {
 399    struct st_context *st = st_context(ctx);
 400    struct pipe_context *pipe = st->pipe;
 401    struct gl_renderbuffer *rb = att->Renderbuffer;
 402    struct st_renderbuffer *strb = st_renderbuffer(rb);
 403    struct pipe_resource *pt;
 404    struct st_texture_object *stObj;
 405    struct pipe_surface surf_tmpl;
 406
 407    if (!st_finalize_texture(ctx, pipe, att->Texture))
 408       return;
 409
 410    pt = st_get_texobj_resource(att->Texture);
 411    assert(pt);
 412
 413    /* get the texture for the texture object */
 414    stObj = st_texture_object(att->Texture);
 415
 416    /* point renderbuffer at texobject */
 417    strb->rtt = stObj;
 418    strb->rtt_level = att->TextureLevel;
 419    strb->rtt_face = att->CubeMapFace;
 420    strb->rtt_slice = att->Zoffset;
 421
 422    pipe_resource_reference( &strb->texture, pt );
 423
 424    pipe_surface_release(pipe, &strb->surface);
 425
 426    assert(strb->rtt_level <= strb->texture->last_level);
 427
 428    /* new surface for rendering into the texture */
 429    memset(&surf_tmpl, 0, sizeof(surf_tmpl));
 430    surf_tmpl.format = ctx->Color.sRGBEnabled
 431       ? strb->texture->format : util_format_linear(strb->texture->format);
 432    surf_tmpl.u.tex.level = strb->rtt_level;
 433    surf_tmpl.u.tex.first_layer = strb->rtt_face + strb->rtt_slice;
 434    surf_tmpl.u.tex.last_layer = strb->rtt_face + strb->rtt_slice;
 435    strb->surface = pipe->create_surface(pipe,
 436                                         strb->texture,
 437                                         &surf_tmpl);
 438
 439    strb->Base.Format = st_pipe_format_to_mesa_format(pt->format);
 440
 441    /* Invalidate buffer state so that the pipe's framebuffer state
 442     * gets updated.
 443     * That's where the new renderbuffer (which we just created) gets
 444     * passed to the pipe as a (color/depth) render target.
 445     */
 446    st_invalidate_state(ctx, _NEW_BUFFERS);
 447
 448
 449    /* Need to trigger a call to update_framebuffer() since we just
 450     * attached a new renderbuffer.
 451     */
 452    ctx->NewState |= _NEW_BUFFERS;
 453 }
 454
 455
 456 /**
 457  * Called via ctx->Driver.FinishRenderTexture.
 458  */
 459 static void
 460 st_finish_render_texture(struct gl_context *ctx, struct gl_renderbuffer *rb)
 461 {
 462    struct st_renderbuffer *strb = st_renderbuffer(rb);
 463
 464    if (!strb)
 465       return;
 466
 467    strb->rtt = NULL;
 468
 469    /* restore previous framebuffer state */
 470    st_invalidate_state(ctx, _NEW_BUFFERS);
 471 }
 472
 473
 474 /** Debug helper */
 475 static void
 476 st_fbo_invalid(const char *reason)
 477 {
 478    if (MESA_DEBUG_FLAGS & DEBUG_INCOMPLETE_FBO) {
 479       _mesa_debug(NULL, "Invalid FBO: %s\n", reason);
 480    }
 481 }
 482
 483
 484 /**
 485  * Validate a renderbuffer attachment for a particular set of bindings.
 486  */
 487 static GLboolean
 488 st_validate_attachment(struct gl_context *ctx,
 489                        struct pipe_screen *screen,
 490                        const struct gl_renderbuffer_attachment *att,
 491                        unsigned bindings)
 492 {
 493    const struct st_texture_object *stObj = st_texture_object(att->Texture);
 494    enum pipe_format format;
 495    gl_format texFormat;
 496    GLboolean valid;
 497
 498    /* Only validate texture attachments for now, since
 499     * st_renderbuffer_alloc_storage makes sure that
 500     * the format is supported.
 501     */
 502    if (att->Type != GL_TEXTURE)
 503       return GL_TRUE;
 504
 505    if (!stObj || !stObj->pt)
 506       return GL_FALSE;
 507
 508    format = stObj->pt->format;
 509    texFormat = att->Renderbuffer->TexImage->TexFormat;
 510
 511    /* If the encoding is sRGB and sRGB rendering cannot be enabled,
 512     * check for linear format support instead.
 513     * Later when we create a surface, we change the format to a linear one. */
 514    if (!ctx->Extensions.EXT_framebuffer_sRGB &&
 515        _mesa_get_format_color_encoding(texFormat) == GL_SRGB) {
 516       const gl_format linearFormat = _mesa_get_srgb_format_linear(texFormat);
 517       format = st_mesa_format_to_pipe_format(linearFormat);
 518    }
 519
 520    valid = screen->is_format_supported(screen, format,
 521                                       PIPE_TEXTURE_2D,
 522                                       stObj->pt->nr_samples, bindings);
 523    if (!valid) {
 524       st_fbo_invalid("Invalid format");
 525    }
 526
 527    return valid;
 528 }
 529
 530
 531 /**
 532  * Check that the framebuffer configuration is valid in terms of what
 533  * the driver can support.
 534  *
 535  * For Gallium we only supports combined Z+stencil, not separate buffers.
 536  */
 537 static void
 538 st_validate_framebuffer(struct gl_context *ctx, struct gl_framebuffer *fb)
 539 {
 540    struct st_context *st = st_context(ctx);
 541    struct pipe_screen *screen = st->pipe->screen;
 542    const struct gl_renderbuffer_attachment *depth =
 543          &fb->Attachment[BUFFER_DEPTH];
 544    const struct gl_renderbuffer_attachment *stencil =
 545          &fb->Attachment[BUFFER_STENCIL];
 546    GLuint i;
 547    enum pipe_format first_format = PIPE_FORMAT_NONE;
 548    boolean mixed_formats =
 549          screen->get_param(screen, PIPE_CAP_MIXED_COLORBUFFER_FORMATS) != 0;
 550
 551    if (depth->Type && stencil->Type && depth->Type != stencil->Type) {
 552       st_fbo_invalid("Different Depth/Stencil buffer formats");
 553       fb->_Status = GL_FRAMEBUFFER_UNSUPPORTED_EXT;
 554       return;
 555    }
 556    if (depth->Type == GL_RENDERBUFFER_EXT &&
 557        stencil->Type == GL_RENDERBUFFER_EXT &&
 558        depth->Renderbuffer != stencil->Renderbuffer) {
 559       st_fbo_invalid("Separate Depth/Stencil buffers");
 560       fb->_Status = GL_FRAMEBUFFER_UNSUPPORTED_EXT;
 561       return;
 562    }
 563    if (depth->Type == GL_TEXTURE &&
 564        stencil->Type == GL_TEXTURE &&
 565        depth->Texture != stencil->Texture) {
 566       fb->_Status = GL_FRAMEBUFFER_UNSUPPORTED_EXT;
 567       st_fbo_invalid("Different Depth/Stencil textures");
 568       return;
 569    }
 570
 571    if (!st_validate_attachment(ctx,
 572                                screen,
 573                                depth,
 574                                PIPE_BIND_DEPTH_STENCIL)) {
 575       fb->_Status = GL_FRAMEBUFFER_UNSUPPORTED_EXT;
 576       return;
 577    }
 578    if (!st_validate_attachment(ctx,
 579                                screen,
 580                                stencil,
 581                                PIPE_BIND_DEPTH_STENCIL)) {
 582       fb->_Status = GL_FRAMEBUFFER_UNSUPPORTED_EXT;
 583       return;
 584    }
 585    for (i = 0; i < ctx->Const.MaxColorAttachments; i++) {
 586       struct gl_renderbuffer_attachment *att =
 587             &fb->Attachment[BUFFER_COLOR0 + i];
 588       enum pipe_format format;
 589
 590       if (!st_validate_attachment(ctx,
 591                                   screen,
 592                                   att,
 593                                   PIPE_BIND_RENDER_TARGET)) {
 594          fb->_Status = GL_FRAMEBUFFER_UNSUPPORTED_EXT;
 595          return;
 596       }
 597
 598       if (!mixed_formats) {
 599          /* Disallow mixed formats. */
 600          if (att->Type != GL_NONE) {
 601             format = st_renderbuffer(att->Renderbuffer)->surface->format;
 602          } else {
 603             continue;
 604          }
 605
 606          if (first_format == PIPE_FORMAT_NONE) {
 607             first_format = format;
 608          } else if (format != first_format) {
 609             fb->_Status = GL_FRAMEBUFFER_UNSUPPORTED_EXT;
 610             st_fbo_invalid("Mixed color formats");
 611             return;
 612          }
 613       }
 614    }
 615 }
 616
 617
 618 /**
 619  * Called via glDrawBuffer.
 620  */
 621 static void
 622 st_DrawBuffers(struct gl_context *ctx, GLsizei count, const GLenum *buffers)
 623 {
 624    struct st_context *st = st_context(ctx);
 625    struct gl_framebuffer *fb = ctx->DrawBuffer;
 626    GLuint i;
 627
 628    (void) count;
 629    (void) buffers;
 630
 631    /* add the renderbuffers on demand */
 632    for (i = 0; i < fb->_NumColorDrawBuffers; i++) {
 633       gl_buffer_index idx = fb->_ColorDrawBufferIndexes[i];
 634       st_manager_add_color_renderbuffer(st, fb, idx);
 635    }
 636 }
 637
 638
 639 /**
 640  * Called via glReadBuffer.
 641  */
 642 static void
 643 st_ReadBuffer(struct gl_context *ctx, GLenum buffer)
 644 {
 645    struct st_context *st = st_context(ctx);
 646    struct gl_framebuffer *fb = ctx->ReadBuffer;
 647
 648    (void) buffer;
 649
 650    /* add the renderbuffer on demand */
 651    st_manager_add_color_renderbuffer(st, fb, fb->_ColorReadBufferIndex);
 652 }
 653
 654
 655
 656 /**
 657  * Called via ctx->Driver.MapRenderbuffer.
 658  */
 659 static void
 660 st_MapRenderbuffer(struct gl_context *ctx,
 661                    struct gl_renderbuffer *rb,
 662                    GLuint x, GLuint y, GLuint w, GLuint h,
 663                    GLbitfield mode,
 664                    GLubyte **mapOut, GLint *rowStrideOut)
 665 {
 666    struct st_context *st = st_context(ctx);
 667    struct st_renderbuffer *strb = st_renderbuffer(rb);
 668    struct pipe_context *pipe = st->pipe;
 669    const GLboolean invert = rb->Name == 0;
 670    unsigned usage;
 671    GLuint y2;
 672    GLubyte *map;
 673
 674    if (strb->software) {
 675       /* software-allocated renderbuffer (probably an accum buffer) */
 676       if (strb->data) {
 677          GLint bpp = _mesa_get_format_bytes(strb->Base.Format);
 678          GLint stride = _mesa_format_row_stride(strb->Base.Format,
 679                                                 strb->Base.Width);
 680          *mapOut = (GLubyte *) strb->data + y * stride + x * bpp;
 681          *rowStrideOut = stride;
 682       }
 683       else {
 684          *mapOut = NULL;
 685          *rowStrideOut = 0;
 686       }
 687       return;
 688    }
 689
 690    usage = 0x0;
 691    if (mode & GL_MAP_READ_BIT)
 692       usage |= PIPE_TRANSFER_READ;
 693    if (mode & GL_MAP_WRITE_BIT)
 694       usage |= PIPE_TRANSFER_WRITE;
 695    if (mode & GL_MAP_INVALIDATE_RANGE_BIT)
 696       usage |= PIPE_TRANSFER_DISCARD_RANGE;
 697
 698    /* Note: y=0=bottom of buffer while y2=0=top of buffer.
 699     * 'invert' will be true for window-system buffers and false for
 700     * user-allocated renderbuffers and textures.
 701     */
 702    if (invert)
 703       y2 = strb->Base.Height - y - h;
 704    else
 705       y2 = y;
 706
 707     map = pipe_transfer_map(pipe,
 708                             strb->texture,
 709                             strb->rtt_level,
 710                             strb->rtt_face + strb->rtt_slice,
 711                             usage, x, y2, w, h, &strb->transfer);
 712    if (map) {
 713       if (invert) {
 714          *rowStrideOut = -(int) strb->transfer->stride;
 715          map += (h - 1) * strb->transfer->stride;
 716       }
 717       else {
 718          *rowStrideOut = strb->transfer->stride;
 719       }
 720       *mapOut = map;
 721    }
 722    else {
 723       *mapOut = NULL;
 724       *rowStrideOut = 0;
 725    }
 726 }
 727
 728
 729 /**
 730  * Called via ctx->Driver.UnmapRenderbuffer.
 731  */
 732 static void
 733 st_UnmapRenderbuffer(struct gl_context *ctx,
 734                      struct gl_renderbuffer *rb)
 735 {
 736    struct st_context *st = st_context(ctx);
 737    struct st_renderbuffer *strb = st_renderbuffer(rb);
 738    struct pipe_context *pipe = st->pipe;
 739
 740    if (strb->software) {
 741       /* software-allocated renderbuffer (probably an accum buffer) */
 742       return;
 743    }
 744
 745    pipe_transfer_unmap(pipe, strb->transfer);
 746    strb->transfer = NULL;
 747 }
 748
 749
 750
 751 void st_init_fbo_functions(struct dd_function_table *functions)
 752 {
 753    functions->NewFramebuffer = st_new_framebuffer;
 754    functions->NewRenderbuffer = st_new_renderbuffer;
 755    functions->BindFramebuffer = st_bind_framebuffer;
 756    functions->FramebufferRenderbuffer = _mesa_framebuffer_renderbuffer;
 757    functions->RenderTexture = st_render_texture;
 758    functions->FinishRenderTexture = st_finish_render_texture;
 759    functions->ValidateFramebuffer = st_validate_framebuffer;
 760
 761    functions->DrawBuffers = st_DrawBuffers;
 762    functions->ReadBuffer = st_ReadBuffer;
 763
 764    functions->MapRenderbuffer = st_MapRenderbuffer;
 765    functions->UnmapRenderbuffer = st_UnmapRenderbuffer;
 766 }
 767
 768