src/mesa/drivers/dri/swrast/swrast.c

   1 /*
   2  * Copyright 2008, 2010 George Sapountzis <gsapountzis@gmail.com>
   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  * BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
  18  * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  19  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  20  */
  21
  22 /*
  23  * DRI software rasterizer
  24  *
  25  * This is the mesa swrast module packaged into a DRI driver structure.
  26  *
  27  * The front-buffer is allocated by the loader. The loader provides read/write
  28  * callbacks for access to the front-buffer. The driver uses a scratch row for
  29  * front-buffer rendering to avoid repeated calls to the loader.
  30  *
  31  * The back-buffer is allocated by the driver and is private.
  32  */
  33
  34 #include "main/context.h"
  35 #include "main/extensions.h"
  36 #include "main/formats.h"
  37 #include "main/framebuffer.h"
  38 #include "main/imports.h"
  39 #include "main/renderbuffer.h"
  40 #include "swrast/swrast.h"
  41 #include "swrast/s_renderbuffer.h"
  42 #include "swrast_setup/swrast_setup.h"
  43 #include "tnl/tnl.h"
  44 #include "tnl/t_context.h"
  45 #include "tnl/t_pipeline.h"
  46 #include "vbo/vbo.h"
  47 #include "drivers/common/driverfuncs.h"
  48 #include "drivers/common/meta.h"
  49 #include "utils.h"
  50
  51 #include "main/teximage.h"
  52 #include "main/texformat.h"
  53 #include "main/texstate.h"
  54
  55 #include "swrast_priv.h"
  56 #include "swrast/s_context.h"
  57
  58
  59 /**
  60  * Screen and config-related functions
  61  */
  62
  63 static void swrastSetTexBuffer2(__DRIcontext *pDRICtx, GLint target,
  64                                 GLint texture_format, __DRIdrawable *dPriv)
  65 {
  66     struct dri_context *dri_ctx;
  67     int x, y, w, h;
  68     __DRIscreen *sPriv = dPriv->driScreenPriv;
  69     struct gl_texture_unit *texUnit;
  70     struct gl_texture_object *texObj;
  71     struct gl_texture_image *texImage;
  72     struct swrast_texture_image *swImage;
  73     uint32_t internalFormat;
  74     gl_format texFormat;
  75
  76     dri_ctx = pDRICtx->driverPrivate;
  77
  78     internalFormat = (texture_format == __DRI_TEXTURE_FORMAT_RGB ? 3 : 4);
  79
  80     texUnit = _mesa_get_current_tex_unit(&dri_ctx->Base);
  81     texObj = _mesa_select_tex_object(&dri_ctx->Base, texUnit, target);
  82     texImage = _mesa_get_tex_image(&dri_ctx->Base, texObj, target, 0);
  83     swImage = swrast_texture_image(texImage);
  84
  85     _mesa_lock_texture(&dri_ctx->Base, texObj);
  86
  87     sPriv->swrast_loader->getDrawableInfo(dPriv, &x, &y, &w, &h, dPriv->loaderPrivate);
  88
  89     if (texture_format == __DRI_TEXTURE_FORMAT_RGB)
  90         texFormat = MESA_FORMAT_XRGB8888;
  91     else
  92         texFormat = MESA_FORMAT_ARGB8888;
  93
  94     _mesa_init_teximage_fields(&dri_ctx->Base, texImage,
  95                                w, h, 1, 0, internalFormat, texFormat);
  96
  97     sPriv->swrast_loader->getImage(dPriv, x, y, w, h, (char *)swImage->Buffer,
  98                                    dPriv->loaderPrivate);
  99
 100     _mesa_unlock_texture(&dri_ctx->Base, texObj);
 101 }
 102
 103 static void swrastSetTexBuffer(__DRIcontext *pDRICtx, GLint target,
 104                                __DRIdrawable *dPriv)
 105 {
 106     swrastSetTexBuffer2(pDRICtx, target, __DRI_TEXTURE_FORMAT_RGBA, dPriv);
 107 }
 108
 109 static const __DRItexBufferExtension swrastTexBufferExtension = {
 110     { __DRI_TEX_BUFFER, __DRI_TEX_BUFFER_VERSION },
 111     swrastSetTexBuffer,
 112     swrastSetTexBuffer2,
 113 };
 114
 115 static const __DRIextension *dri_screen_extensions[] = {
 116     &swrastTexBufferExtension.base,
 117     NULL
 118 };
 119
 120 static __DRIconfig **
 121 swrastFillInModes(__DRIscreen *psp,
 122                   unsigned pixel_bits, unsigned depth_bits,
 123                   unsigned stencil_bits, GLboolean have_back_buffer)
 124 {
 125     __DRIconfig **configs;
 126     unsigned depth_buffer_factor;
 127     unsigned back_buffer_factor;
 128     GLenum fb_format;
 129     GLenum fb_type;
 130
 131     /* GLX_SWAP_COPY_OML is only supported because the Intel driver doesn't
 132      * support pageflipping at all.
 133      */
 134     static const GLenum back_buffer_modes[] = {
 135         GLX_NONE, GLX_SWAP_UNDEFINED_OML
 136     };
 137
 138     uint8_t depth_bits_array[4];
 139     uint8_t stencil_bits_array[4];
 140     uint8_t msaa_samples_array[1];
 141
 142     (void) psp;
 143     (void) have_back_buffer;
 144
 145     depth_bits_array[0] = 0;
 146     depth_bits_array[1] = 0;
 147     depth_bits_array[2] = depth_bits;
 148     depth_bits_array[3] = depth_bits;
 149
 150     /* Just like with the accumulation buffer, always provide some modes
 151      * with a stencil buffer.
 152      */
 153     stencil_bits_array[0] = 0;
 154     stencil_bits_array[1] = (stencil_bits == 0) ? 8 : stencil_bits;
 155     stencil_bits_array[2] = 0;
 156     stencil_bits_array[3] = (stencil_bits == 0) ? 8 : stencil_bits;
 157
 158     msaa_samples_array[0] = 0;
 159
 160     depth_buffer_factor = 4;
 161     back_buffer_factor = 2;
 162
 163     switch (pixel_bits) {
 164     case 16:
 165         fb_format = GL_RGB;
 166         fb_type = GL_UNSIGNED_SHORT_5_6_5;
 167         break;
 168     case 24:
 169         fb_format = GL_BGR;
 170         fb_type = GL_UNSIGNED_INT_8_8_8_8_REV;
 171         break;
 172     case 32:
 173         fb_format = GL_BGRA;
 174         fb_type = GL_UNSIGNED_INT_8_8_8_8_REV;
 175         break;
 176     default:
 177         fprintf(stderr, "[%s:%u] bad depth %d\n", __func__, __LINE__,
 178                 pixel_bits);
 179         return NULL;
 180     }
 181
 182     configs = driCreateConfigs(fb_format, fb_type,
 183                                depth_bits_array, stencil_bits_array,
 184                                depth_buffer_factor, back_buffer_modes,
 185                                back_buffer_factor, msaa_samples_array, 1,
 186                                GL_TRUE);
 187     if (configs == NULL) {
 188         fprintf(stderr, "[%s:%u] Error creating FBConfig!\n", __func__,
 189                 __LINE__);
 190         return NULL;
 191     }
 192
 193     return configs;
 194 }
 195
 196 static const __DRIconfig **
 197 dri_init_screen(__DRIscreen * psp)
 198 {
 199     __DRIconfig **configs8, **configs16, **configs24, **configs32;
 200
 201     TRACE;
 202
 203     psp->extensions = dri_screen_extensions;
 204
 205     configs8  = swrastFillInModes(psp,  8,  8, 0, 1);
 206     configs16 = swrastFillInModes(psp, 16, 16, 0, 1);
 207     configs24 = swrastFillInModes(psp, 24, 24, 8, 1);
 208     configs32 = swrastFillInModes(psp, 32, 24, 8, 1);
 209
 210     configs16 = driConcatConfigs(configs8, configs16);
 211     configs24 = driConcatConfigs(configs16, configs24);
 212     configs32 = driConcatConfigs(configs24, configs32);
 213
 214     return (const __DRIconfig **)configs32;
 215 }
 216
 217 static void
 218 dri_destroy_screen(__DRIscreen * sPriv)
 219 {
 220     TRACE;
 221     (void) sPriv;
 222 }
 223
 224
 225 /**
 226  * Framebuffer and renderbuffer-related functions.
 227  */
 228
 229 static GLuint
 230 choose_pixel_format(const struct gl_config *v)
 231 {
 232     int depth = v->rgbBits;
 233
 234     if (depth == 32
 235         && v->redMask   == 0xff0000
 236         && v->greenMask == 0x00ff00
 237         && v->blueMask  == 0x0000ff)
 238         return PF_A8R8G8B8;
 239     else if (depth == 24
 240              && v->redMask   == 0xff0000
 241              && v->greenMask == 0x00ff00
 242              && v->blueMask  == 0x0000ff)
 243         return PF_X8R8G8B8;
 244     else if (depth == 16
 245              && v->redMask   == 0xf800
 246              && v->greenMask == 0x07e0
 247              && v->blueMask  == 0x001f)
 248         return PF_R5G6B5;
 249     else if (depth == 8
 250              && v->redMask   == 0x07
 251              && v->greenMask == 0x38
 252              && v->blueMask  == 0xc0)
 253         return PF_R3G3B2;
 254
 255     _mesa_problem( NULL, "unexpected format in %s", __FUNCTION__ );
 256     return 0;
 257 }
 258
 259 static void
 260 swrast_delete_renderbuffer(struct gl_renderbuffer *rb)
 261 {
 262     struct dri_swrast_renderbuffer *xrb = dri_swrast_renderbuffer(rb);
 263
 264     TRACE;
 265
 266     free(xrb->Base.Buffer);
 267     _mesa_delete_renderbuffer(rb);
 268 }
 269
 270 /* see bytes_per_line in libGL */
 271 static INLINE int
 272 bytes_per_line(unsigned pitch_bits, unsigned mul)
 273 {
 274    unsigned mask = mul - 1;
 275
 276    return ((pitch_bits + mask) & ~mask) / 8;
 277 }
 278
 279 static GLboolean
 280 swrast_alloc_front_storage(struct gl_context *ctx, struct gl_renderbuffer *rb,
 281                            GLenum internalFormat, GLuint width, GLuint height)
 282 {
 283     struct dri_swrast_renderbuffer *xrb = dri_swrast_renderbuffer(rb);
 284
 285     TRACE;
 286
 287     (void) ctx;
 288     (void) internalFormat;
 289
 290     xrb->Base.Buffer = NULL;
 291     rb->Width = width;
 292     rb->Height = height;
 293     xrb->pitch = bytes_per_line(width * xrb->bpp, 32);
 294
 295     return GL_TRUE;
 296 }
 297
 298 static GLboolean
 299 swrast_alloc_back_storage(struct gl_context *ctx, struct gl_renderbuffer *rb,
 300                           GLenum internalFormat, GLuint width, GLuint height)
 301 {
 302     struct dri_swrast_renderbuffer *xrb = dri_swrast_renderbuffer(rb);
 303
 304     TRACE;
 305
 306     free(xrb->Base.Buffer);
 307
 308     swrast_alloc_front_storage(ctx, rb, internalFormat, width, height);
 309
 310     xrb->Base.Buffer = malloc(height * xrb->pitch);
 311
 312     return GL_TRUE;
 313 }
 314
 315 static struct dri_swrast_renderbuffer *
 316 swrast_new_renderbuffer(const struct gl_config *visual, __DRIdrawable *dPriv,
 317                         GLboolean front)
 318 {
 319     struct dri_swrast_renderbuffer *xrb = calloc(1, sizeof *xrb);
 320     struct gl_renderbuffer *rb;
 321     GLuint pixel_format;
 322
 323     TRACE;
 324
 325     if (!xrb)
 326         return NULL;
 327
 328     rb = &xrb->Base.Base;
 329
 330     _mesa_init_renderbuffer(rb, 0);
 331
 332     pixel_format = choose_pixel_format(visual);
 333
 334     xrb->dPriv = dPriv;
 335     xrb->Base.Base.Delete = swrast_delete_renderbuffer;
 336     if (front) {
 337         rb->AllocStorage = swrast_alloc_front_storage;
 338     }
 339     else {
 340         rb->AllocStorage = swrast_alloc_back_storage;
 341     }
 342
 343     switch (pixel_format) {
 344     case PF_A8R8G8B8:
 345         rb->Format = MESA_FORMAT_ARGB8888;
 346         rb->InternalFormat = GL_RGBA;
 347         rb->_BaseFormat = GL_RGBA;
 348         xrb->bpp = 32;
 349         break;
 350     case PF_X8R8G8B8:
 351         rb->Format = MESA_FORMAT_ARGB8888; /* XXX */
 352         rb->InternalFormat = GL_RGB;
 353         rb->_BaseFormat = GL_RGB;
 354         xrb->bpp = 32;
 355         break;
 356     case PF_R5G6B5:
 357         rb->Format = MESA_FORMAT_RGB565;
 358         rb->InternalFormat = GL_RGB;
 359         rb->_BaseFormat = GL_RGB;
 360         xrb->bpp = 16;
 361         break;
 362     case PF_R3G3B2:
 363         rb->Format = MESA_FORMAT_RGB332;
 364         rb->InternalFormat = GL_RGB;
 365         rb->_BaseFormat = GL_RGB;
 366         xrb->bpp = 8;
 367         break;
 368     default:
 369         return NULL;
 370     }
 371
 372     return xrb;
 373 }
 374
 375 static void
 376 swrast_map_renderbuffer(struct gl_context *ctx,
 377                         struct gl_renderbuffer *rb,
 378                         GLuint x, GLuint y, GLuint w, GLuint h,
 379                         GLbitfield mode,
 380                         GLubyte **out_map,
 381                         GLint *out_stride)
 382 {
 383    struct dri_swrast_renderbuffer *xrb = dri_swrast_renderbuffer(rb);
 384    GLubyte *map = xrb->Base.Buffer;
 385    int cpp = _mesa_get_format_bytes(rb->Format);
 386    int stride = rb->Width * cpp;
 387
 388    if (rb->AllocStorage == swrast_alloc_front_storage) {
 389       __DRIdrawable *dPriv = xrb->dPriv;
 390       __DRIscreen *sPriv = dPriv->driScreenPriv;
 391
 392       xrb->map_mode = mode;
 393       xrb->map_x = x;
 394       xrb->map_y = y;
 395       xrb->map_w = w;
 396       xrb->map_h = h;
 397
 398       stride = w * cpp;
 399       xrb->Base.Buffer = malloc(h * stride);
 400
 401       sPriv->swrast_loader->getImage(dPriv, x, y, w, h,
 402                                      (char *) xrb->Base.Buffer,
 403                                      dPriv->loaderPrivate);
 404
 405       *out_map = xrb->Base.Buffer;
 406       *out_stride = stride;
 407       return;
 408    }
 409
 410    ASSERT(xrb->Base.Buffer);
 411
 412    if (rb->AllocStorage == swrast_alloc_back_storage) {
 413       map += (rb->Height - 1) * stride;
 414       stride = -stride;
 415    }
 416
 417    map += (GLsizei)y * stride;
 418    map += (GLsizei)x * cpp;
 419
 420    *out_map = map;
 421    *out_stride = stride;
 422 }
 423
 424 static void
 425 swrast_unmap_renderbuffer(struct gl_context *ctx,
 426                           struct gl_renderbuffer *rb)
 427 {
 428    struct dri_swrast_renderbuffer *xrb = dri_swrast_renderbuffer(rb);
 429
 430    if (rb->AllocStorage == swrast_alloc_front_storage) {
 431       __DRIdrawable *dPriv = xrb->dPriv;
 432       __DRIscreen *sPriv = dPriv->driScreenPriv;
 433
 434       if (xrb->map_mode & GL_MAP_WRITE_BIT) {
 435          sPriv->swrast_loader->putImage(dPriv, __DRI_SWRAST_IMAGE_OP_DRAW,
 436                                         xrb->map_x, xrb->map_y,
 437                                         xrb->map_w, xrb->map_h,
 438                                         (char *) xrb->Base.Buffer,
 439                                         dPriv->loaderPrivate);
 440       }
 441
 442       free(xrb->Base.Buffer);
 443       xrb->Base.Buffer = NULL;
 444    }
 445 }
 446
 447 static GLboolean
 448 dri_create_buffer(__DRIscreen * sPriv,
 449                   __DRIdrawable * dPriv,
 450                   const struct gl_config * visual, GLboolean isPixmap)
 451 {
 452     struct dri_drawable *drawable = NULL;
 453     struct gl_framebuffer *fb;
 454     struct dri_swrast_renderbuffer *frontrb, *backrb;
 455
 456     TRACE;
 457
 458     (void) sPriv;
 459     (void) isPixmap;
 460
 461     drawable = CALLOC_STRUCT(dri_drawable);
 462     if (drawable == NULL)
 463         goto drawable_fail;
 464
 465     dPriv->driverPrivate = drawable;
 466     drawable->dPriv = dPriv;
 467
 468     drawable->row = malloc(SWRAST_MAX_WIDTH * 4);
 469     if (drawable->row == NULL)
 470         goto drawable_fail;
 471
 472     fb = &drawable->Base;
 473
 474     /* basic framebuffer setup */
 475     _mesa_initialize_window_framebuffer(fb, visual);
 476
 477     /* add front renderbuffer */
 478     frontrb = swrast_new_renderbuffer(visual, dPriv, GL_TRUE);
 479     _mesa_add_renderbuffer(fb, BUFFER_FRONT_LEFT, &frontrb->Base.Base);
 480
 481     /* add back renderbuffer */
 482     if (visual->doubleBufferMode) {
 483         backrb = swrast_new_renderbuffer(visual, dPriv, GL_FALSE);
 484         _mesa_add_renderbuffer(fb, BUFFER_BACK_LEFT, &backrb->Base.Base);
 485     }
 486
 487     /* add software renderbuffers */
 488     _swrast_add_soft_renderbuffers(fb,
 489                                    GL_FALSE, /* color */
 490                                    visual->haveDepthBuffer,
 491                                    visual->haveStencilBuffer,
 492                                    visual->haveAccumBuffer,
 493                                    GL_FALSE, /* alpha */
 494                                    GL_FALSE /* aux bufs */);
 495
 496     return GL_TRUE;
 497
 498 drawable_fail:
 499
 500     if (drawable)
 501         free(drawable->row);
 502
 503     free(drawable);
 504
 505     return GL_FALSE;
 506 }
 507
 508 static void
 509 dri_destroy_buffer(__DRIdrawable * dPriv)
 510 {
 511     TRACE;
 512
 513     if (dPriv) {
 514         struct dri_drawable *drawable = dri_drawable(dPriv);
 515         struct gl_framebuffer *fb;
 516
 517         free(drawable->row);
 518
 519         fb = &drawable->Base;
 520
 521         fb->DeletePending = GL_TRUE;
 522         _mesa_reference_framebuffer(&fb, NULL);
 523     }
 524 }
 525
 526 static void
 527 dri_swap_buffers(__DRIdrawable * dPriv)
 528 {
 529     __DRIscreen *sPriv = dPriv->driScreenPriv;
 530
 531     GET_CURRENT_CONTEXT(ctx);
 532
 533     struct dri_drawable *drawable = dri_drawable(dPriv);
 534     struct gl_framebuffer *fb;
 535     struct dri_swrast_renderbuffer *frontrb, *backrb;
 536
 537     TRACE;
 538
 539     fb = &drawable->Base;
 540
 541     frontrb =
 542         dri_swrast_renderbuffer(fb->Attachment[BUFFER_FRONT_LEFT].Renderbuffer);
 543     backrb =
 544         dri_swrast_renderbuffer(fb->Attachment[BUFFER_BACK_LEFT].Renderbuffer);
 545
 546     /* check for signle-buffered */
 547     if (backrb == NULL)
 548         return;
 549
 550     /* check if swapping currently bound buffer */
 551     if (ctx && ctx->DrawBuffer == fb) {
 552         /* flush pending rendering */
 553         _mesa_notifySwapBuffers(ctx);
 554     }
 555
 556     sPriv->swrast_loader->putImage(dPriv, __DRI_SWRAST_IMAGE_OP_SWAP,
 557                                    0, 0,
 558                                    frontrb->Base.Base.Width,
 559                                    frontrb->Base.Base.Height,
 560                                    (char *) backrb->Base.Buffer,
 561                                    dPriv->loaderPrivate);
 562 }
 563
 564
 565 /**
 566  * General device driver functions.
 567  */
 568
 569 static void
 570 get_window_size( struct gl_framebuffer *fb, GLsizei *w, GLsizei *h )
 571 {
 572     __DRIdrawable *dPriv = swrast_drawable(fb)->dPriv;
 573     __DRIscreen *sPriv = dPriv->driScreenPriv;
 574     int x, y;
 575
 576     sPriv->swrast_loader->getDrawableInfo(dPriv,
 577                                           &x, &y, w, h,
 578                                           dPriv->loaderPrivate);
 579 }
 580
 581 static void
 582 swrast_check_and_update_window_size( struct gl_context *ctx, struct gl_framebuffer *fb )
 583 {
 584     GLsizei width, height;
 585
 586     get_window_size(fb, &width, &height);
 587     if (fb->Width != width || fb->Height != height) {
 588         _mesa_resize_framebuffer(ctx, fb, width, height);
 589     }
 590 }
 591
 592 static const GLubyte *
 593 get_string(struct gl_context *ctx, GLenum pname)
 594 {
 595     (void) ctx;
 596     switch (pname) {
 597         case GL_VENDOR:
 598             return (const GLubyte *) "Mesa Project";
 599         case GL_RENDERER:
 600             return (const GLubyte *) "Software Rasterizer";
 601         default:
 602             return NULL;
 603     }
 604 }
 605
 606 static void
 607 update_state( struct gl_context *ctx, GLuint new_state )
 608 {
 609     /* not much to do here - pass it on */
 610     _swrast_InvalidateState( ctx, new_state );
 611     _swsetup_InvalidateState( ctx, new_state );
 612     _vbo_InvalidateState( ctx, new_state );
 613     _tnl_InvalidateState( ctx, new_state );
 614 }
 615
 616 static void
 617 viewport(struct gl_context *ctx, GLint x, GLint y, GLsizei w, GLsizei h)
 618 {
 619     struct gl_framebuffer *draw = ctx->WinSysDrawBuffer;
 620     struct gl_framebuffer *read = ctx->WinSysReadBuffer;
 621
 622     (void) x;
 623     (void) y;
 624     (void) w;
 625     (void) h;
 626     swrast_check_and_update_window_size(ctx, draw);
 627     swrast_check_and_update_window_size(ctx, read);
 628 }
 629
 630 static gl_format swrastChooseTextureFormat(struct gl_context * ctx,
 631                                            GLenum target,
 632                                            GLint internalFormat,
 633                                            GLenum format,
 634                                            GLenum type)
 635 {
 636     if (internalFormat == GL_RGB)
 637         return MESA_FORMAT_XRGB8888;
 638     return _mesa_choose_tex_format(ctx, target, internalFormat, format, type);
 639 }
 640
 641 static void
 642 swrast_init_driver_functions(struct dd_function_table *driver)
 643 {
 644     driver->GetString = get_string;
 645     driver->UpdateState = update_state;
 646     driver->GetBufferSize = NULL;
 647     driver->Viewport = viewport;
 648     driver->ChooseTextureFormat = swrastChooseTextureFormat;
 649     driver->MapRenderbuffer = swrast_map_renderbuffer;
 650     driver->UnmapRenderbuffer = swrast_unmap_renderbuffer;
 651 }
 652
 653 static const char *es2_extensions[] = {
 654    /* Used by mesa internally (cf all_mesa_extensions in ../common/utils.c) */
 655    "GL_ARB_transpose_matrix",
 656    "GL_ARB_window_pos",
 657    "GL_EXT_blend_func_separate",
 658    "GL_EXT_compiled_vertex_array",
 659    "GL_EXT_framebuffer_blit",
 660    "GL_IBM_multimode_draw_arrays",
 661    "GL_MESA_window_pos",
 662
 663    /* Required by GLES2 */
 664    "GL_ARB_fragment_program",
 665    "GL_ARB_fragment_shader",
 666    "GL_ARB_shader_objects",
 667    "GL_ARB_texture_cube_map",
 668    "GL_ARB_texture_non_power_of_two",
 669    "GL_ARB_vertex_shader",
 670    "GL_EXT_blend_color",
 671    "GL_EXT_blend_equation_separate",
 672    "GL_EXT_blend_minmax",
 673
 674    /* Optional GLES2 */
 675    "GL_ARB_framebuffer_object",
 676    "GL_EXT_texture_filter_anisotropic",
 677    "GL_ARB_depth_texture",
 678    "GL_EXT_packed_depth_stencil",
 679    "GL_EXT_framebuffer_object",
 680    NULL,
 681 };
 682
 683 static void
 684 InitExtensionsES2(struct gl_context *ctx)
 685 {
 686    int i;
 687
 688    for (i = 0; es2_extensions[i]; i++)
 689       _mesa_enable_extension(ctx, es2_extensions[i]);
 690 }
 691
 692 /**
 693  * Context-related functions.
 694  */
 695
 696 static GLboolean
 697 dri_create_context(gl_api api,
 698                    const struct gl_config * visual,
 699                    __DRIcontext * cPriv,
 700                    unsigned major_version,
 701                    unsigned minor_version,
 702                    uint32_t flags,
 703                    unsigned *error,
 704                    void *sharedContextPrivate)
 705 {
 706     struct dri_context *ctx = NULL;
 707     struct dri_context *share = (struct dri_context *)sharedContextPrivate;
 708     struct gl_context *mesaCtx = NULL;
 709     struct gl_context *sharedCtx = NULL;
 710     struct dd_function_table functions;
 711
 712     TRACE;
 713
 714     /* Flag filtering is handled in dri2CreateContextAttribs.
 715      */
 716     (void) flags;
 717
 718     switch (api) {
 719     case API_OPENGL:
 720         if (major_version > 2
 721             || (major_version == 2 && minor_version > 1)) {
 722             *error = __DRI_CTX_ERROR_BAD_VERSION;
 723             return GL_FALSE;
 724         }
 725         break;
 726     case API_OPENGLES:
 727     case API_OPENGLES2:
 728         break;
 729     case API_OPENGL_CORE:
 730         *error = __DRI_CTX_ERROR_BAD_API;
 731         return GL_FALSE;
 732     }
 733
 734     ctx = CALLOC_STRUCT(dri_context);
 735     if (ctx == NULL) {
 736         *error = __DRI_CTX_ERROR_NO_MEMORY;
 737         goto context_fail;
 738     }
 739
 740     cPriv->driverPrivate = ctx;
 741     ctx->cPriv = cPriv;
 742
 743     /* build table of device driver functions */
 744     _mesa_init_driver_functions(&functions);
 745     swrast_init_driver_functions(&functions);
 746
 747     if (share) {
 748         sharedCtx = &share->Base;
 749     }
 750
 751     mesaCtx = &ctx->Base;
 752
 753     /* basic context setup */
 754     if (!_mesa_initialize_context(mesaCtx, api, visual, sharedCtx, &functions)) {
 755         *error = __DRI_CTX_ERROR_NO_MEMORY;
 756         goto context_fail;
 757     }
 758
 759     /* do bounds checking to prevent segfaults and server crashes! */
 760     mesaCtx->Const.CheckArrayBounds = GL_TRUE;
 761
 762     /* create module contexts */
 763     _swrast_CreateContext( mesaCtx );
 764     _vbo_CreateContext( mesaCtx );
 765     _tnl_CreateContext( mesaCtx );
 766     _swsetup_CreateContext( mesaCtx );
 767     _swsetup_Wakeup( mesaCtx );
 768
 769     /* use default TCL pipeline */
 770     {
 771        TNLcontext *tnl = TNL_CONTEXT(mesaCtx);
 772        tnl->Driver.RunPipeline = _tnl_run_pipeline;
 773     }
 774
 775     _mesa_meta_init(mesaCtx);
 776     _mesa_enable_sw_extensions(mesaCtx);
 777
 778     switch (api) {
 779     case API_OPENGL_CORE:
 780         /* XXX fix me, fall-through for now */
 781     case API_OPENGL:
 782         _mesa_enable_1_3_extensions(mesaCtx);
 783         _mesa_enable_1_4_extensions(mesaCtx);
 784         _mesa_enable_1_5_extensions(mesaCtx);
 785         _mesa_enable_2_0_extensions(mesaCtx);
 786         _mesa_enable_2_1_extensions(mesaCtx);
 787         break;
 788     case API_OPENGLES:
 789         _mesa_enable_1_3_extensions(mesaCtx);
 790         _mesa_enable_1_4_extensions(mesaCtx);
 791         _mesa_enable_1_5_extensions(mesaCtx);
 792
 793         break;
 794     case API_OPENGLES2:
 795         InitExtensionsES2( mesaCtx);
 796         break;
 797     }
 798
 799     *error = __DRI_CTX_ERROR_SUCCESS;
 800     return GL_TRUE;
 801
 802 context_fail:
 803
 804     free(ctx);
 805
 806     return GL_FALSE;
 807 }
 808
 809 static void
 810 dri_destroy_context(__DRIcontext * cPriv)
 811 {
 812     TRACE;
 813
 814     if (cPriv) {
 815         struct dri_context *ctx = dri_context(cPriv);
 816         struct gl_context *mesaCtx;
 817
 818         mesaCtx = &ctx->Base;
 819
 820         _mesa_meta_free(mesaCtx);
 821         _swsetup_DestroyContext( mesaCtx );
 822         _swrast_DestroyContext( mesaCtx );
 823         _tnl_DestroyContext( mesaCtx );
 824         _vbo_DestroyContext( mesaCtx );
 825         _mesa_destroy_context( mesaCtx );
 826     }
 827 }
 828
 829 static GLboolean
 830 dri_make_current(__DRIcontext * cPriv,
 831                  __DRIdrawable * driDrawPriv,
 832                  __DRIdrawable * driReadPriv)
 833 {
 834     struct gl_context *mesaCtx;
 835     struct gl_framebuffer *mesaDraw;
 836     struct gl_framebuffer *mesaRead;
 837     TRACE;
 838
 839     if (cPriv) {
 840         struct dri_context *ctx = dri_context(cPriv);
 841         struct dri_drawable *draw;
 842         struct dri_drawable *read;
 843
 844         if (!driDrawPriv || !driReadPriv)
 845             return GL_FALSE;
 846
 847         draw = dri_drawable(driDrawPriv);
 848         read = dri_drawable(driReadPriv);
 849         mesaCtx = &ctx->Base;
 850         mesaDraw = &draw->Base;
 851         mesaRead = &read->Base;
 852
 853         /* check for same context and buffer */
 854         if (mesaCtx == _mesa_get_current_context()
 855             && mesaCtx->DrawBuffer == mesaDraw
 856             && mesaCtx->ReadBuffer == mesaRead) {
 857             return GL_TRUE;
 858         }
 859
 860         _glapi_check_multithread();
 861
 862         swrast_check_and_update_window_size(mesaCtx, mesaDraw);
 863         if (mesaRead != mesaDraw)
 864             swrast_check_and_update_window_size(mesaCtx, mesaRead);
 865
 866         _mesa_make_current( mesaCtx,
 867                             mesaDraw,
 868                             mesaRead );
 869     }
 870     else {
 871         /* unbind */
 872         _mesa_make_current( NULL, NULL, NULL );
 873     }
 874
 875     return GL_TRUE;
 876 }
 877
 878 static GLboolean
 879 dri_unbind_context(__DRIcontext * cPriv)
 880 {
 881     TRACE;
 882     (void) cPriv;
 883
 884     /* Unset current context and dispath table */
 885     _mesa_make_current(NULL, NULL, NULL);
 886
 887     return GL_TRUE;
 888 }
 889
 890
 891 const struct __DriverAPIRec driDriverAPI = {
 892     .InitScreen = dri_init_screen,
 893     .DestroyScreen = dri_destroy_screen,
 894     .CreateContext = dri_create_context,
 895     .DestroyContext = dri_destroy_context,
 896     .CreateBuffer = dri_create_buffer,
 897     .DestroyBuffer = dri_destroy_buffer,
 898     .SwapBuffers = dri_swap_buffers,
 899     .MakeCurrent = dri_make_current,
 900     .UnbindContext = dri_unbind_context,
 901 };
 902
 903 /* This is the table of extensions that the loader will dlsym() for. */
 904 PUBLIC const __DRIextension *__driDriverExtensions[] = {
 905     &driCoreExtension.base,
 906     &driSWRastExtension.base,
 907     NULL
 908 };