src/gallium/state_trackers/osmesa/osmesa.c

   1 /*
   2  * Copyright (c) 2013  Brian Paul   All Rights Reserved.
   3  *
   4  * Permission is hereby granted, free of charge, to any person obtaining a
   5  * copy of this software and associated documentation files (the "Software"),
   6  * to deal in the Software without restriction, including without limitation
   7  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
   8  * and/or sell copies of the Software, and to permit persons to whom the
   9  * Software is furnished to do so, subject to the following conditions:
  10  *
  11  * The above copyright notice and this permission notice shall be included
  12  * in all copies or substantial portions of the Software.
  13  *
  14  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  15  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  16  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  17  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
  18  * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
  19  * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
  20  * OTHER DEALINGS IN THE SOFTWARE.
  21  */
  22
  23
  24 /*
  25  * Off-Screen rendering into client memory.
  26  * State tracker for gallium (for softpipe and llvmpipe)
  27  *
  28  * Notes:
  29  *
  30  * If Gallium is built with LLVM support we use the llvmpipe driver.
  31  * Otherwise we use softpipe.  The GALLIUM_DRIVER environment variable
  32  * may be set to "softpipe" or "llvmpipe" to override.
  33  *
  34  * With softpipe we could render directly into the user's buffer by using a
  35  * display target resource.  However, softpipe doesn't suport "upside-down"
  36  * rendering which would be needed for the OSMESA_Y_UP=TRUE case.
  37  *
  38  * With llvmpipe we could only render directly into the user's buffer when its
  39  * width and height is a multiple of the tile size (64 pixels).
  40  *
  41  * Because of these constraints we always render into ordinary resources then
  42  * copy the results to the user's buffer in the flush_front() function which
  43  * is called when the app calls glFlush/Finish.
  44  *
  45  * In general, the OSMesa interface is pretty ugly and not a good match
  46  * for Gallium.  But we're interested in doing the best we can to preserve
  47  * application portability.  With a little work we could come up with a
  48  * much nicer, new off-screen Gallium interface...
  49  */
  50
  51
  52 #include <stdio.h>
  53 #include "GL/osmesa.h"
  54
  55 #include "glapi/glapi.h"  /* for OSMesaGetProcAddress below */
  56
  57 #include "pipe/p_context.h"
  58 #include "pipe/p_screen.h"
  59 #include "pipe/p_state.h"
  60
  61 #include "util/u_atomic.h"
  62 #include "util/u_box.h"
  63 #include "util/u_debug.h"
  64 #include "util/u_format.h"
  65 #include "util/u_memory.h"
  66
  67 #include "postprocess/filters.h"
  68 #include "postprocess/postprocess.h"
  69
  70 #include "state_tracker/st_api.h"
  71 #include "state_tracker/st_gl_api.h"
  72
  73
  74
  75 extern struct pipe_screen *
  76 osmesa_create_screen(void);
  77
  78
  79
  80 struct osmesa_buffer
  81 {
  82    struct st_framebuffer_iface *stfb;
  83    struct st_visual visual;
  84    unsigned width, height;
  85
  86    struct pipe_resource *textures[ST_ATTACHMENT_COUNT];
  87
  88    void *map;
  89
  90    struct osmesa_buffer *next;  /**< next in linked list */
  91 };
  92
  93
  94 struct osmesa_context
  95 {
  96    struct st_context_iface *stctx;
  97
  98    boolean ever_used;     /*< Has this context ever been current? */
  99
 100    struct osmesa_buffer *current_buffer;
 101
 102    enum pipe_format depth_stencil_format, accum_format;
 103
 104    GLenum format;         /*< User-specified context format */
 105    GLenum type;           /*< Buffer's data type */
 106    GLint user_row_length; /*< user-specified number of pixels per row */
 107    GLboolean y_up;        /*< TRUE  -> Y increases upward */
 108                           /*< FALSE -> Y increases downward */
 109
 110    /** Which postprocessing filters are enabled. */
 111    unsigned pp_enabled[PP_FILTERS];
 112    struct pp_queue_t *pp;
 113 };
 114
 115
 116 /**
 117  * Linked list of all osmesa_buffers.
 118  * We can re-use an osmesa_buffer from one OSMesaMakeCurrent() call to
 119  * the next unless the color/depth/stencil/accum formats change.
 120  * We have to do this to be compatible with the original OSMesa implementation
 121  * because some apps call OSMesaMakeCurrent() several times during rendering
 122  * a frame.
 123  */
 124 static struct osmesa_buffer *BufferList = NULL;
 125
 126
 127 /**
 128  * Called from the ST manager.
 129  */
 130 static int
 131 osmesa_st_get_param(struct st_manager *smapi, enum st_manager_param param)
 132 {
 133    /* no-op */
 134    return 0;
 135 }
 136
 137
 138 /**
 139  * Create/return singleton st_api object.
 140  */
 141 static struct st_api *
 142 get_st_api(void)
 143 {
 144    static struct st_api *stapi = NULL;
 145    if (!stapi) {
 146       stapi = st_gl_api_create();
 147    }
 148    return stapi;
 149 }
 150
 151
 152 /**
 153  * Create/return a singleton st_manager object.
 154  */
 155 static struct st_manager *
 156 get_st_manager(void)
 157 {
 158    static struct st_manager *stmgr = NULL;
 159    if (!stmgr) {
 160       stmgr = CALLOC_STRUCT(st_manager);
 161       if (stmgr) {
 162          stmgr->screen = osmesa_create_screen();
 163          stmgr->get_param = osmesa_st_get_param;
 164          stmgr->get_egl_image = NULL;
 165       }
 166    }
 167    return stmgr;
 168 }
 169
 170
 171 static INLINE boolean
 172 little_endian(void)
 173 {
 174    const unsigned ui = 1;
 175    return *((const char *) &ui);
 176 }
 177
 178
 179 /**
 180  * Given an OSMESA_x format and a GL_y type, return the best
 181  * matching PIPE_FORMAT_z.
 182  * Note that we can't exactly match all user format/type combinations
 183  * with gallium formats.  If we find this to be a problem, we can
 184  * implement more elaborate format/type conversion in the flush_front()
 185  * function.
 186  */
 187 static enum pipe_format
 188 osmesa_choose_format(GLenum format, GLenum type)
 189 {
 190    switch (format) {
 191    case OSMESA_RGBA:
 192       if (type == GL_UNSIGNED_BYTE) {
 193          if (little_endian())
 194             return PIPE_FORMAT_R8G8B8A8_UNORM;
 195          else
 196             return PIPE_FORMAT_A8B8G8R8_UNORM;
 197       }
 198       else if (type == GL_UNSIGNED_SHORT) {
 199          return PIPE_FORMAT_R16G16B16A16_UNORM;
 200       }
 201       else if (type == GL_FLOAT) {
 202          return PIPE_FORMAT_R32G32B32A32_FLOAT;
 203       }
 204       else {
 205          return PIPE_FORMAT_NONE;
 206       }
 207       break;
 208    case OSMESA_BGRA:
 209       if (type == GL_UNSIGNED_BYTE) {
 210          if (little_endian())
 211             return PIPE_FORMAT_B8G8R8A8_UNORM;
 212          else
 213             return PIPE_FORMAT_A8R8G8B8_UNORM;
 214       }
 215       else if (type == GL_UNSIGNED_SHORT) {
 216          return PIPE_FORMAT_R16G16B16A16_UNORM;
 217       }
 218       else if (type == GL_FLOAT) {
 219          return PIPE_FORMAT_R32G32B32A32_FLOAT;
 220       }
 221       else {
 222          return PIPE_FORMAT_NONE;
 223       }
 224       break;
 225    case OSMESA_ARGB:
 226       if (type == GL_UNSIGNED_BYTE) {
 227          if (little_endian())
 228             return PIPE_FORMAT_A8R8G8B8_UNORM;
 229          else
 230             return PIPE_FORMAT_B8G8R8A8_UNORM;
 231       }
 232       else if (type == GL_UNSIGNED_SHORT) {
 233          return PIPE_FORMAT_R16G16B16A16_UNORM;
 234       }
 235       else if (type == GL_FLOAT) {
 236          return PIPE_FORMAT_R32G32B32A32_FLOAT;
 237       }
 238       else {
 239          return PIPE_FORMAT_NONE;
 240       }
 241       break;
 242    case OSMESA_RGB:
 243       if (type == GL_UNSIGNED_BYTE) {
 244          return PIPE_FORMAT_R8G8B8_UNORM;
 245       }
 246       else if (type == GL_UNSIGNED_SHORT) {
 247          return PIPE_FORMAT_R16G16B16_UNORM;
 248       }
 249       else if (type == GL_FLOAT) {
 250          return PIPE_FORMAT_R32G32B32_FLOAT;
 251       }
 252       else {
 253          return PIPE_FORMAT_NONE;
 254       }
 255       break;
 256    case OSMESA_BGR:
 257       /* No gallium format for this one */
 258       return PIPE_FORMAT_NONE;
 259    case OSMESA_RGB_565:
 260       return PIPE_FORMAT_B5G6R5_UNORM;
 261    default:
 262       ; /* fall-through */
 263    }
 264    return PIPE_FORMAT_NONE;
 265 }
 266
 267
 268 /**
 269  * Initialize an st_visual object.
 270  */
 271 static void
 272 osmesa_init_st_visual(struct st_visual *vis,
 273                       enum pipe_format color_format,
 274                       enum pipe_format ds_format,
 275                       enum pipe_format accum_format)
 276 {
 277    vis->buffer_mask = ST_ATTACHMENT_FRONT_LEFT_MASK;
 278
 279    if (ds_format != PIPE_FORMAT_NONE)
 280       vis->buffer_mask |= ST_ATTACHMENT_DEPTH_STENCIL_MASK;
 281    if (accum_format != PIPE_FORMAT_NONE)
 282       vis->buffer_mask |= ST_ATTACHMENT_ACCUM;
 283
 284    vis->color_format = color_format;
 285    vis->depth_stencil_format = ds_format;
 286    vis->accum_format = accum_format;
 287    vis->samples = 1;
 288    vis->render_buffer = ST_ATTACHMENT_FRONT_LEFT;
 289 }
 290
 291
 292 /**
 293  * Return the osmesa_buffer that corresponds to an st_framebuffer_iface.
 294  */
 295 static INLINE struct osmesa_buffer *
 296 stfbi_to_osbuffer(struct st_framebuffer_iface *stfbi)
 297 {
 298    return (struct osmesa_buffer *) stfbi->st_manager_private;
 299 }
 300
 301
 302 /**
 303  * Called via glFlush/glFinish.  This is where we copy the contents
 304  * of the driver's color buffer into the user-specified buffer.
 305  */
 306 static boolean
 307 osmesa_st_framebuffer_flush_front(struct st_context_iface *stctx,
 308                                   struct st_framebuffer_iface *stfbi,
 309                                   enum st_attachment_type statt)
 310 {
 311    OSMesaContext osmesa = OSMesaGetCurrentContext();
 312    struct osmesa_buffer *osbuffer = stfbi_to_osbuffer(stfbi);
 313    struct pipe_context *pipe = stctx->pipe;
 314    struct pipe_resource *res = osbuffer->textures[statt];
 315    struct pipe_transfer *transfer = NULL;
 316    struct pipe_box box;
 317    void *map;
 318    ubyte *src, *dst;
 319    unsigned y, bytes, bpp;
 320    int dst_stride;
 321
 322    if (osmesa->pp) {
 323       struct pipe_resource *zsbuf = NULL;
 324       unsigned i;
 325
 326       /* Find the z/stencil buffer if there is one */
 327       for (i = 0; i < Elements(osbuffer->textures); i++) {
 328          struct pipe_resource *res = osbuffer->textures[i];
 329          if (res) {
 330             const struct util_format_description *desc =
 331                util_format_description(res->format);
 332
 333             if (util_format_has_depth(desc)) {
 334                zsbuf = res;
 335                break;
 336             }
 337          }
 338       }
 339
 340       /* run the postprocess stage(s) */
 341       pp_run(osmesa->pp, res, res, zsbuf);
 342    }
 343
 344    u_box_2d(0, 0, res->width0, res->height0, &box);
 345
 346    map = pipe->transfer_map(pipe, res, 0, PIPE_TRANSFER_READ, &box,
 347                             &transfer);
 348
 349    /*
 350     * Copy the color buffer from the resource to the user's buffer.
 351     */
 352    bpp = util_format_get_blocksize(osbuffer->visual.color_format);
 353    src = map;
 354    dst = osbuffer->map;
 355    if (osmesa->user_row_length)
 356       dst_stride = bpp * osmesa->user_row_length;
 357    else
 358       dst_stride = bpp * osbuffer->width;
 359    bytes = bpp * res->width0;
 360
 361    if (osmesa->y_up) {
 362       /* need to flip image upside down */
 363       dst = dst + (res->height0 - 1) * dst_stride;
 364       dst_stride = -dst_stride;
 365    }
 366
 367    for (y = 0; y < res->height0; y++) {
 368       memcpy(dst, src, bytes);
 369       dst += dst_stride;
 370       src += transfer->stride;
 371    }
 372
 373    pipe->transfer_unmap(pipe, transfer);
 374
 375    return TRUE;
 376 }
 377
 378
 379 /**
 380  * Called by the st manager to validate the framebuffer (allocate
 381  * its resources).
 382  */
 383 static boolean
 384 osmesa_st_framebuffer_validate(struct st_context_iface *stctx,
 385                                struct st_framebuffer_iface *stfbi,
 386                                const enum st_attachment_type *statts,
 387                                unsigned count,
 388                                struct pipe_resource **out)
 389 {
 390    struct pipe_screen *screen = get_st_manager()->screen;
 391    enum st_attachment_type i;
 392    struct osmesa_buffer *osbuffer = stfbi_to_osbuffer(stfbi);
 393    struct pipe_resource templat;
 394
 395    memset(&templat, 0, sizeof(templat));
 396    templat.target = PIPE_TEXTURE_RECT;
 397    templat.format = 0; /* setup below */
 398    templat.last_level = 0;
 399    templat.width0 = osbuffer->width;
 400    templat.height0 = osbuffer->height;
 401    templat.depth0 = 1;
 402    templat.array_size = 1;
 403    templat.usage = PIPE_USAGE_DEFAULT;
 404    templat.bind = 0; /* setup below */
 405    templat.flags = 0;
 406
 407    for (i = 0; i < count; i++) {
 408       enum pipe_format format = PIPE_FORMAT_NONE;
 409       unsigned bind = 0;
 410
 411       /*
 412        * At this time, we really only need to handle the front-left color
 413        * attachment, since that's all we specified for the visual in
 414        * osmesa_init_st_visual().
 415        */
 416       if (statts[i] == ST_ATTACHMENT_FRONT_LEFT) {
 417          format = osbuffer->visual.color_format;
 418          bind = PIPE_BIND_RENDER_TARGET;
 419       }
 420       else if (statts[i] == ST_ATTACHMENT_DEPTH_STENCIL) {
 421          format = osbuffer->visual.depth_stencil_format;
 422          bind = PIPE_BIND_DEPTH_STENCIL;
 423       }
 424       else if (statts[i] == ST_ATTACHMENT_ACCUM) {
 425          format = osbuffer->visual.accum_format;
 426          bind = PIPE_BIND_RENDER_TARGET;
 427       }
 428       else {
 429          debug_warning("Unexpected attachment type in "
 430                        "osmesa_st_framebuffer_validate()");
 431       }
 432
 433       templat.format = format;
 434       templat.bind = bind;
 435       out[i] = osbuffer->textures[statts[i]] =
 436          screen->resource_create(screen, &templat);
 437    }
 438
 439    return TRUE;
 440 }
 441
 442
 443 static struct st_framebuffer_iface *
 444 osmesa_create_st_framebuffer(void)
 445 {
 446    struct st_framebuffer_iface *stfbi = CALLOC_STRUCT(st_framebuffer_iface);
 447    if (stfbi) {
 448       stfbi->flush_front = osmesa_st_framebuffer_flush_front;
 449       stfbi->validate = osmesa_st_framebuffer_validate;
 450       p_atomic_set(&stfbi->stamp, 1);
 451    }
 452    return stfbi;
 453 }
 454
 455
 456 /**
 457  * Create new buffer and add to linked list.
 458  */
 459 static struct osmesa_buffer *
 460 osmesa_create_buffer(enum pipe_format color_format,
 461                      enum pipe_format ds_format,
 462                      enum pipe_format accum_format)
 463 {
 464    struct osmesa_buffer *osbuffer = CALLOC_STRUCT(osmesa_buffer);
 465    if (osbuffer) {
 466       osbuffer->stfb = osmesa_create_st_framebuffer();
 467
 468       osbuffer->stfb->st_manager_private = osbuffer;
 469       osbuffer->stfb->visual = &osbuffer->visual;
 470
 471       osmesa_init_st_visual(&osbuffer->visual, color_format,
 472                             ds_format, accum_format);
 473
 474       /* insert into linked list */
 475       osbuffer->next = BufferList;
 476       BufferList = osbuffer;
 477    }
 478
 479    return osbuffer;
 480 }
 481
 482
 483 /**
 484  * Search linked list for a buffer with matching pixel formats and size.
 485  */
 486 static struct osmesa_buffer *
 487 osmesa_find_buffer(enum pipe_format color_format,
 488                    enum pipe_format ds_format,
 489                    enum pipe_format accum_format,
 490                    GLsizei width, GLsizei height)
 491 {
 492    struct osmesa_buffer *b;
 493
 494    /* Check if we already have a suitable buffer for the given formats */
 495    for (b = BufferList; b; b = b->next) {
 496       if (b->visual.color_format == color_format &&
 497           b->visual.depth_stencil_format == ds_format &&
 498           b->visual.accum_format == accum_format &&
 499           b->width == width &&
 500           b->height == height) {
 501          return b;
 502       }
 503    }
 504    return NULL;
 505 }
 506
 507
 508 static void
 509 osmesa_destroy_buffer(struct osmesa_buffer *osbuffer)
 510 {
 511    FREE(osbuffer->stfb);
 512    FREE(osbuffer);
 513 }
 514
 515
 516
 517 /**********************************************************************/
 518 /*****                    Public Functions                        *****/
 519 /**********************************************************************/
 520
 521
 522 /**
 523  * Create an Off-Screen Mesa rendering context.  The only attribute needed is
 524  * an RGBA vs Color-Index mode flag.
 525  *
 526  * Input:  format - Must be GL_RGBA
 527  *         sharelist - specifies another OSMesaContext with which to share
 528  *                     display lists.  NULL indicates no sharing.
 529  * Return:  an OSMesaContext or 0 if error
 530  */
 531 GLAPI OSMesaContext GLAPIENTRY
 532 OSMesaCreateContext(GLenum format, OSMesaContext sharelist)
 533 {
 534    return OSMesaCreateContextExt(format, 24, 8, 0, sharelist);
 535 }
 536
 537
 538 /**
 539  * New in Mesa 3.5
 540  *
 541  * Create context and specify size of ancillary buffers.
 542  */
 543 GLAPI OSMesaContext GLAPIENTRY
 544 OSMesaCreateContextExt(GLenum format, GLint depthBits, GLint stencilBits,
 545                        GLint accumBits, OSMesaContext sharelist)
 546 {
 547    OSMesaContext osmesa;
 548    struct st_context_iface *st_shared;
 549    enum st_context_error st_error = 0;
 550    struct st_context_attribs attribs;
 551    struct st_api *stapi = get_st_api();
 552
 553    if (sharelist) {
 554       st_shared = sharelist->stctx;
 555    }
 556    else {
 557       st_shared = NULL;
 558    }
 559
 560    osmesa = (OSMesaContext) CALLOC_STRUCT(osmesa_context);
 561    if (!osmesa)
 562       return NULL;
 563
 564    /* Choose depth/stencil/accum buffer formats */
 565    if (accumBits > 0) {
 566       osmesa->accum_format = PIPE_FORMAT_R16G16B16A16_SNORM;
 567    }
 568    if (depthBits > 0 && stencilBits > 0) {
 569       osmesa->depth_stencil_format = PIPE_FORMAT_Z24_UNORM_S8_UINT;
 570    }
 571    else if (stencilBits > 0) {
 572       osmesa->depth_stencil_format = PIPE_FORMAT_S8_UINT;
 573    }
 574    else if (depthBits >= 24) {
 575       osmesa->depth_stencil_format = PIPE_FORMAT_Z24X8_UNORM;
 576    }
 577    else if (depthBits >= 16) {
 578       osmesa->depth_stencil_format = PIPE_FORMAT_Z16_UNORM;
 579    }
 580
 581    /*
 582     * Create the rendering context
 583     */
 584    attribs.profile = ST_PROFILE_DEFAULT;
 585    attribs.major = 2;
 586    attribs.minor = 1;
 587    attribs.flags = 0;  /* ST_CONTEXT_FLAG_x */
 588    attribs.options.force_glsl_extensions_warn = FALSE;
 589    attribs.options.disable_blend_func_extended = FALSE;
 590    attribs.options.disable_glsl_line_continuations = FALSE;
 591    attribs.options.disable_shader_bit_encoding = FALSE;
 592    attribs.options.force_s3tc_enable = FALSE;
 593    attribs.options.force_glsl_version = 0;
 594
 595    osmesa_init_st_visual(&attribs.visual,
 596                          PIPE_FORMAT_R8G8B8A8_UNORM,
 597                          osmesa->depth_stencil_format,
 598                          osmesa->accum_format);
 599
 600    osmesa->stctx = stapi->create_context(stapi, get_st_manager(),
 601                                          &attribs, &st_error, st_shared);
 602    if (!osmesa->stctx) {
 603       FREE(osmesa);
 604       return NULL;
 605    }
 606
 607    osmesa->stctx->st_manager_private = osmesa;
 608
 609    osmesa->format = format;
 610    osmesa->user_row_length = 0;
 611    osmesa->y_up = GL_TRUE;
 612
 613    return osmesa;
 614 }
 615
 616
 617 /**
 618  * Destroy an Off-Screen Mesa rendering context.
 619  *
 620  * \param osmesa  the context to destroy
 621  */
 622 GLAPI void GLAPIENTRY
 623 OSMesaDestroyContext(OSMesaContext osmesa)
 624 {
 625    if (osmesa) {
 626       pp_free(osmesa->pp);
 627       osmesa->stctx->destroy(osmesa->stctx);
 628       FREE(osmesa);
 629    }
 630 }
 631
 632
 633 /**
 634  * Bind an OSMesaContext to an image buffer.  The image buffer is just a
 635  * block of memory which the client provides.  Its size must be at least
 636  * as large as width*height*pixelSize.  Its address should be a multiple
 637  * of 4 if using RGBA mode.
 638  *
 639  * By default, image data is stored in the order of glDrawPixels: row-major
 640  * order with the lower-left image pixel stored in the first array position
 641  * (ie. bottom-to-top).
 642  *
 643  * If the context's viewport hasn't been initialized yet, it will now be
 644  * initialized to (0,0,width,height).
 645  *
 646  * Input:  osmesa - the rendering context
 647  *         buffer - the image buffer memory
 648  *         type - data type for pixel components
 649  *                GL_UNSIGNED_BYTE, GL_UNSIGNED_SHORT_5_6_5, GL_UNSIGNED_SHORT
 650  *                or GL_FLOAT.
 651  *         width, height - size of image buffer in pixels, at least 1
 652  * Return:  GL_TRUE if success, GL_FALSE if error because of invalid osmesa,
 653  *          invalid type, invalid size, etc.
 654  */
 655 GLAPI GLboolean GLAPIENTRY
 656 OSMesaMakeCurrent(OSMesaContext osmesa, void *buffer, GLenum type,
 657                   GLsizei width, GLsizei height)
 658 {
 659    struct st_api *stapi = get_st_api();
 660    struct osmesa_buffer *osbuffer;
 661    enum pipe_format color_format;
 662
 663    if (!osmesa || !buffer || width < 1 || height < 1) {
 664       return GL_FALSE;
 665    }
 666
 667    if (osmesa->format == OSMESA_RGB_565 && type != GL_UNSIGNED_SHORT_5_6_5) {
 668       return GL_FALSE;
 669    }
 670
 671    color_format = osmesa_choose_format(osmesa->format, type);
 672    if (color_format == PIPE_FORMAT_NONE) {
 673       fprintf(stderr, "OSMesaMakeCurrent(unsupported format/type)\n");
 674       return GL_FALSE;
 675    }
 676
 677    /* See if we already have a buffer that uses these pixel formats */
 678    osbuffer = osmesa_find_buffer(color_format,
 679                                  osmesa->depth_stencil_format,
 680                                  osmesa->accum_format, width, height);
 681    if (!osbuffer) {
 682       /* Existing buffer found, create new buffer */
 683       osbuffer = osmesa_create_buffer(color_format,
 684                                       osmesa->depth_stencil_format,
 685                                       osmesa->accum_format);
 686    }
 687
 688    osbuffer->width = width;
 689    osbuffer->height = height;
 690    osbuffer->map = buffer;
 691
 692    /* XXX unused for now */
 693    (void) osmesa_destroy_buffer;
 694
 695    osmesa->current_buffer = osbuffer;
 696    osmesa->type = type;
 697
 698    stapi->make_current(stapi, osmesa->stctx, osbuffer->stfb, osbuffer->stfb);
 699
 700    if (!osmesa->ever_used) {
 701       /* one-time init, just postprocessing for now */
 702       boolean any_pp_enabled = FALSE;
 703       unsigned i;
 704
 705       for (i = 0; i < Elements(osmesa->pp_enabled); i++) {
 706          if (osmesa->pp_enabled[i]) {
 707             any_pp_enabled = TRUE;
 708             break;
 709          }
 710       }
 711
 712       if (any_pp_enabled) {
 713          osmesa->pp = pp_init(osmesa->stctx->pipe,
 714                               osmesa->pp_enabled,
 715                               osmesa->stctx->cso_context);
 716
 717          pp_init_fbos(osmesa->pp, width, height);
 718       }
 719
 720       osmesa->ever_used = TRUE;
 721    }
 722
 723    return GL_TRUE;
 724 }
 725
 726
 727
 728 GLAPI OSMesaContext GLAPIENTRY
 729 OSMesaGetCurrentContext(void)
 730 {
 731    struct st_api *stapi = get_st_api();
 732    struct st_context_iface *st = stapi->get_current(stapi);
 733    return st ? (OSMesaContext) st->st_manager_private : NULL;
 734 }
 735
 736
 737
 738 GLAPI void GLAPIENTRY
 739 OSMesaPixelStore(GLint pname, GLint value)
 740 {
 741    OSMesaContext osmesa = OSMesaGetCurrentContext();
 742
 743    switch (pname) {
 744    case OSMESA_ROW_LENGTH:
 745       osmesa->user_row_length = value;
 746       break;
 747    case OSMESA_Y_UP:
 748       osmesa->y_up = value ? GL_TRUE : GL_FALSE;
 749       break;
 750    default:
 751       fprintf(stderr, "Invalid pname in OSMesaPixelStore()\n");
 752       return;
 753    }
 754 }
 755
 756
 757 GLAPI void GLAPIENTRY
 758 OSMesaGetIntegerv(GLint pname, GLint *value)
 759 {
 760    OSMesaContext osmesa = OSMesaGetCurrentContext();
 761    struct osmesa_buffer *osbuffer = osmesa ? osmesa->current_buffer : NULL;
 762
 763    switch (pname) {
 764    case OSMESA_WIDTH:
 765       *value = osbuffer ? osbuffer->width : 0;
 766       return;
 767    case OSMESA_HEIGHT:
 768       *value = osbuffer ? osbuffer->height : 0;
 769       return;
 770    case OSMESA_FORMAT:
 771       *value = osmesa->format;
 772       return;
 773    case OSMESA_TYPE:
 774       /* current color buffer's data type */
 775       *value = osmesa->type;
 776       return;
 777    case OSMESA_ROW_LENGTH:
 778       *value = osmesa->user_row_length;
 779       return;
 780    case OSMESA_Y_UP:
 781       *value = osmesa->y_up;
 782       return;
 783    case OSMESA_MAX_WIDTH:
 784       /* fall-through */
 785    case OSMESA_MAX_HEIGHT:
 786       {
 787          struct pipe_screen *screen = get_st_manager()->screen;
 788          int maxLevels = screen->get_param(screen,
 789                                            PIPE_CAP_MAX_TEXTURE_2D_LEVELS);
 790          *value = 1 << (maxLevels - 1);
 791          *value = 8 * 1024;
 792       }
 793       return;
 794    default:
 795       fprintf(stderr, "Invalid pname in OSMesaGetIntegerv()\n");
 796       return;
 797    }
 798 }
 799
 800
 801 /**
 802  * Return information about the depth buffer associated with an OSMesa context.
 803  * Input:  c - the OSMesa context
 804  * Output:  width, height - size of buffer in pixels
 805  *          bytesPerValue - bytes per depth value (2 or 4)
 806  *          buffer - pointer to depth buffer values
 807  * Return:  GL_TRUE or GL_FALSE to indicate success or failure.
 808  */
 809 GLAPI GLboolean GLAPIENTRY
 810 OSMesaGetDepthBuffer(OSMesaContext c, GLint *width, GLint *height,
 811                      GLint *bytesPerValue, void **buffer)
 812 {
 813    struct osmesa_buffer *osbuffer = c->current_buffer;
 814    struct pipe_context *pipe = c->stctx->pipe;
 815    struct pipe_resource *res = osbuffer->textures[ST_ATTACHMENT_DEPTH_STENCIL];
 816    struct pipe_transfer *transfer = NULL;
 817    struct pipe_box box;
 818
 819    /*
 820     * Note: we can't really implement this function with gallium as
 821     * we did for swrast.  We can't just map the resource and leave it
 822     * mapped (and there's no OSMesaUnmapDepthBuffer() function) so
 823     * we unmap the buffer here and return a 'stale' pointer.  This should
 824     * actually be OK in most cases where the caller of this function
 825     * immediately uses the pointer.
 826     */
 827
 828    u_box_2d(0, 0, res->width0, res->height0, &box);
 829
 830    *buffer = pipe->transfer_map(pipe, res, 0, PIPE_TRANSFER_READ, &box,
 831                                 &transfer);
 832    if (!*buffer) {
 833       return GL_FALSE;
 834    }
 835
 836    *width = res->width0;
 837    *height = res->height0;
 838    *bytesPerValue = util_format_get_blocksize(res->format);
 839
 840    pipe->transfer_unmap(pipe, transfer);
 841
 842    return GL_TRUE;
 843 }
 844
 845
 846 /**
 847  * Return the color buffer associated with an OSMesa context.
 848  * Input:  c - the OSMesa context
 849  * Output:  width, height - size of buffer in pixels
 850  *          format - the pixel format (OSMESA_FORMAT)
 851  *          buffer - pointer to color buffer values
 852  * Return:  GL_TRUE or GL_FALSE to indicate success or failure.
 853  */
 854 GLAPI GLboolean GLAPIENTRY
 855 OSMesaGetColorBuffer(OSMesaContext osmesa, GLint *width,
 856                       GLint *height, GLint *format, void **buffer)
 857 {
 858    struct osmesa_buffer *osbuffer = osmesa->current_buffer;
 859
 860    if (osbuffer) {
 861       *width = osbuffer->width;
 862       *height = osbuffer->height;
 863       *format = osmesa->format;
 864       *buffer = osbuffer->map;
 865       return GL_TRUE;
 866    }
 867    else {
 868       *width = 0;
 869       *height = 0;
 870       *format = 0;
 871       *buffer = 0;
 872       return GL_FALSE;
 873    }
 874 }
 875
 876
 877 struct name_function
 878 {
 879    const char *Name;
 880    OSMESAproc Function;
 881 };
 882
 883 static struct name_function functions[] = {
 884    { "OSMesaCreateContext", (OSMESAproc) OSMesaCreateContext },
 885    { "OSMesaCreateContextExt", (OSMESAproc) OSMesaCreateContextExt },
 886    { "OSMesaDestroyContext", (OSMESAproc) OSMesaDestroyContext },
 887    { "OSMesaMakeCurrent", (OSMESAproc) OSMesaMakeCurrent },
 888    { "OSMesaGetCurrentContext", (OSMESAproc) OSMesaGetCurrentContext },
 889    { "OSMesaPixelsStore", (OSMESAproc) OSMesaPixelStore },
 890    { "OSMesaGetIntegerv", (OSMESAproc) OSMesaGetIntegerv },
 891    { "OSMesaGetDepthBuffer", (OSMESAproc) OSMesaGetDepthBuffer },
 892    { "OSMesaGetColorBuffer", (OSMESAproc) OSMesaGetColorBuffer },
 893    { "OSMesaGetProcAddress", (OSMESAproc) OSMesaGetProcAddress },
 894    { "OSMesaColorClamp", (OSMESAproc) OSMesaColorClamp },
 895    { "OSMesaPostprocess", (OSMESAproc) OSMesaPostprocess },
 896    { NULL, NULL }
 897 };
 898
 899
 900 GLAPI OSMESAproc GLAPIENTRY
 901 OSMesaGetProcAddress(const char *funcName)
 902 {
 903    int i;
 904    for (i = 0; functions[i].Name; i++) {
 905       if (strcmp(functions[i].Name, funcName) == 0)
 906          return functions[i].Function;
 907    }
 908    return _glapi_get_proc_address(funcName);
 909 }
 910
 911
 912 GLAPI void GLAPIENTRY
 913 OSMesaColorClamp(GLboolean enable)
 914 {
 915    extern void GLAPIENTRY _mesa_ClampColor(GLenum target, GLenum clamp);
 916
 917    _mesa_ClampColor(GL_CLAMP_FRAGMENT_COLOR_ARB,
 918                     enable ? GL_TRUE : GL_FIXED_ONLY_ARB);
 919 }
 920
 921
 922 GLAPI void GLAPIENTRY
 923 OSMesaPostprocess(OSMesaContext osmesa, const char *filter,
 924                   unsigned enable_value)
 925 {
 926    if (!osmesa->ever_used) {
 927       /* We can only enable/disable postprocess filters before a context
 928        * is made current for the first time.
 929        */
 930       unsigned i;
 931
 932       for (i = 0; i < PP_FILTERS; i++) {
 933          if (strcmp(pp_filters[i].name, filter) == 0) {
 934             osmesa->pp_enabled[i] = enable_value;
 935             return;
 936          }
 937       }
 938       debug_warning("OSMesaPostprocess(unknown filter)\n");
 939    }
 940    else {
 941       debug_warning("Calling OSMesaPostprocess() after OSMesaMakeCurrent()\n");
 942    }
 943 }