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