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 8:
 165         fb_format = GL_RGB;
 166         fb_type = GL_UNSIGNED_BYTE_2_3_3_REV;
 167         break;
 168     case 16:
 169         fb_format = GL_RGB;
 170         fb_type = GL_UNSIGNED_SHORT_5_6_5;
 171         break;
 172     case 24:
 173         fb_format = GL_BGR;
 174         fb_type = GL_UNSIGNED_INT_8_8_8_8_REV;
 175         break;
 176     case 32:
 177         fb_format = GL_BGRA;
 178         fb_type = GL_UNSIGNED_INT_8_8_8_8_REV;
 179         break;
 180     default:
 181         fprintf(stderr, "[%s:%u] bad depth %d\n", __func__, __LINE__,
 182                 pixel_bits);
 183         return NULL;
 184     }
 185
 186     configs = driCreateConfigs(fb_format, fb_type,
 187                                depth_bits_array, stencil_bits_array,
 188                                depth_buffer_factor, back_buffer_modes,
 189                                back_buffer_factor, msaa_samples_array, 1,
 190                                GL_TRUE);
 191     if (configs == NULL) {
 192         fprintf(stderr, "[%s:%u] Error creating FBConfig!\n", __func__,
 193                 __LINE__);
 194         return NULL;
 195     }
 196
 197     return configs;
 198 }
 199
 200 static const __DRIconfig **
 201 dri_init_screen(__DRIscreen * psp)
 202 {
 203     __DRIconfig **configs8, **configs16, **configs24, **configs32;
 204
 205     TRACE;
 206
 207     psp->extensions = dri_screen_extensions;
 208
 209     configs8  = swrastFillInModes(psp,  8,  8, 0, 1);
 210     configs16 = swrastFillInModes(psp, 16, 16, 0, 1);
 211     configs24 = swrastFillInModes(psp, 24, 24, 8, 1);
 212     configs32 = swrastFillInModes(psp, 32, 24, 8, 1);
 213
 214     configs16 = driConcatConfigs(configs8, configs16);
 215     configs24 = driConcatConfigs(configs16, configs24);
 216     configs32 = driConcatConfigs(configs24, configs32);
 217
 218     return (const __DRIconfig **)configs32;
 219 }
 220
 221 static void
 222 dri_destroy_screen(__DRIscreen * sPriv)
 223 {
 224     TRACE;
 225     (void) sPriv;
 226 }
 227
 228
 229 /**
 230  * Framebuffer and renderbuffer-related functions.
 231  */
 232
 233 static GLuint
 234 choose_pixel_format(const struct gl_config *v)
 235 {
 236     int depth = v->rgbBits;
 237
 238     if (depth == 32
 239         && v->redMask   == 0xff0000
 240         && v->greenMask == 0x00ff00
 241         && v->blueMask  == 0x0000ff)
 242         return PF_A8R8G8B8;
 243     else if (depth == 24
 244              && v->redMask   == 0xff0000
 245              && v->greenMask == 0x00ff00
 246              && v->blueMask  == 0x0000ff)
 247         return PF_X8R8G8B8;
 248     else if (depth == 16
 249              && v->redMask   == 0xf800
 250              && v->greenMask == 0x07e0
 251              && v->blueMask  == 0x001f)
 252         return PF_R5G6B5;
 253     else if (depth == 8
 254              && v->redMask   == 0x07
 255              && v->greenMask == 0x38
 256              && v->blueMask  == 0xc0)
 257         return PF_R3G3B2;
 258
 259     _mesa_problem( NULL, "unexpected format in %s", __FUNCTION__ );
 260     return 0;
 261 }
 262
 263 static void
 264 swrast_delete_renderbuffer(struct gl_renderbuffer *rb)
 265 {
 266     TRACE;
 267
 268     free(rb->Data);
 269     free(rb);
 270 }
 271
 272 /* see bytes_per_line in libGL */
 273 static INLINE int
 274 bytes_per_line(unsigned pitch_bits, unsigned mul)
 275 {
 276    unsigned mask = mul - 1;
 277
 278    return ((pitch_bits + mask) & ~mask) / 8;
 279 }
 280
 281 static GLboolean
 282 swrast_alloc_front_storage(struct gl_context *ctx, struct gl_renderbuffer *rb,
 283                            GLenum internalFormat, GLuint width, GLuint height)
 284 {
 285     struct swrast_renderbuffer *xrb = swrast_renderbuffer(rb);
 286
 287     TRACE;
 288
 289     (void) ctx;
 290     (void) internalFormat;
 291
 292     rb->Data = NULL;
 293     rb->Width = width;
 294     rb->Height = height;
 295     rb->RowStride = width;
 296     xrb->pitch = bytes_per_line(width * xrb->bpp, 32);
 297
 298     return GL_TRUE;
 299 }
 300
 301 static GLboolean
 302 swrast_alloc_back_storage(struct gl_context *ctx, struct gl_renderbuffer *rb,
 303                           GLenum internalFormat, GLuint width, GLuint height)
 304 {
 305     struct swrast_renderbuffer *xrb = swrast_renderbuffer(rb);
 306
 307     TRACE;
 308
 309     free(rb->Data);
 310
 311     swrast_alloc_front_storage(ctx, rb, internalFormat, width, height);
 312
 313     rb->Data = malloc(height * xrb->pitch);
 314
 315     return GL_TRUE;
 316 }
 317
 318 static struct swrast_renderbuffer *
 319 swrast_new_renderbuffer(const struct gl_config *visual, __DRIdrawable *dPriv,
 320                         GLboolean front)
 321 {
 322     struct swrast_renderbuffer *xrb = calloc(1, sizeof *xrb);
 323     GLuint pixel_format;
 324
 325     TRACE;
 326
 327     if (!xrb)
 328         return NULL;
 329
 330     _mesa_init_renderbuffer(&xrb->Base, 0);
 331
 332     pixel_format = choose_pixel_format(visual);
 333
 334     xrb->dPriv = dPriv;
 335     xrb->Base.Delete = swrast_delete_renderbuffer;
 336     if (front) {
 337         xrb->Base.AllocStorage = swrast_alloc_front_storage;
 338     }
 339     else {
 340         xrb->Base.AllocStorage = swrast_alloc_back_storage;
 341     }
 342
 343     switch (pixel_format) {
 344     case PF_A8R8G8B8:
 345         xrb->Base.Format = MESA_FORMAT_ARGB8888;
 346         xrb->Base.InternalFormat = GL_RGBA;
 347         xrb->Base._BaseFormat = GL_RGBA;
 348         xrb->Base.DataType = GL_UNSIGNED_BYTE;
 349         xrb->bpp = 32;
 350         break;
 351     case PF_X8R8G8B8:
 352         xrb->Base.Format = MESA_FORMAT_ARGB8888; /* XXX */
 353         xrb->Base.InternalFormat = GL_RGB;
 354         xrb->Base._BaseFormat = GL_RGB;
 355         xrb->Base.DataType = GL_UNSIGNED_BYTE;
 356         xrb->bpp = 32;
 357         break;
 358     case PF_R5G6B5:
 359         xrb->Base.Format = MESA_FORMAT_RGB565;
 360         xrb->Base.InternalFormat = GL_RGB;
 361         xrb->Base._BaseFormat = GL_RGB;
 362         xrb->Base.DataType = GL_UNSIGNED_BYTE;
 363         xrb->bpp = 16;
 364         break;
 365     case PF_R3G3B2:
 366         xrb->Base.Format = MESA_FORMAT_RGB332;
 367         xrb->Base.InternalFormat = GL_RGB;
 368         xrb->Base._BaseFormat = GL_RGB;
 369         xrb->Base.DataType = GL_UNSIGNED_BYTE;
 370         xrb->bpp = 8;
 371         break;
 372     default:
 373         return NULL;
 374     }
 375
 376     return xrb;
 377 }
 378
 379 static void
 380 swrast_map_renderbuffer(struct gl_context *ctx,
 381                         struct gl_renderbuffer *rb,
 382                         GLuint x, GLuint y, GLuint w, GLuint h,
 383                         GLbitfield mode,
 384                         GLubyte **out_map,
 385                         GLint *out_stride)
 386 {
 387    struct swrast_renderbuffer *xrb = swrast_renderbuffer(rb);
 388    GLubyte *map = rb->Data;
 389    int cpp = _mesa_get_format_bytes(rb->Format);
 390    int stride = rb->RowStride * cpp;
 391
 392    if (rb->AllocStorage == swrast_alloc_front_storage) {
 393       __DRIdrawable *dPriv = xrb->dPriv;
 394       __DRIscreen *sPriv = dPriv->driScreenPriv;
 395
 396       xrb->map_mode = mode;
 397       xrb->map_x = x;
 398       xrb->map_y = y;
 399       xrb->map_w = w;
 400       xrb->map_h = h;
 401
 402       stride = w * cpp;
 403       rb->Data = malloc(h * stride);
 404
 405       sPriv->swrast_loader->getImage(dPriv, x, y, w, h,
 406                                      (char *)rb->Data,
 407                                      dPriv->loaderPrivate);
 408
 409       *out_map = rb->Data;
 410       *out_stride = stride;
 411       return;
 412    }
 413
 414    ASSERT(rb->Data);
 415
 416    if (rb->AllocStorage == swrast_alloc_back_storage) {
 417       map += (rb->Height - 1) * stride;
 418       stride = -stride;
 419    }
 420
 421    map += (GLsizei)y * stride;
 422    map += (GLsizei)x * cpp;
 423
 424    *out_map = map;
 425    *out_stride = stride;
 426 }
 427
 428 static void
 429 swrast_unmap_renderbuffer(struct gl_context *ctx,
 430                           struct gl_renderbuffer *rb)
 431 {
 432    struct swrast_renderbuffer *xrb = swrast_renderbuffer(rb);
 433
 434    if (rb->AllocStorage == swrast_alloc_front_storage) {
 435       __DRIdrawable *dPriv = xrb->dPriv;
 436       __DRIscreen *sPriv = dPriv->driScreenPriv;
 437
 438       if (xrb->map_mode & GL_MAP_WRITE_BIT) {
 439          sPriv->swrast_loader->putImage(dPriv, __DRI_SWRAST_IMAGE_OP_DRAW,
 440                                         xrb->map_x, xrb->map_y,
 441                                         xrb->map_w, xrb->map_h,
 442                                         rb->Data,
 443                                         dPriv->loaderPrivate);
 444       }
 445
 446       free(rb->Data);
 447       rb->Data = NULL;
 448    }
 449 }
 450
 451 static GLboolean
 452 dri_create_buffer(__DRIscreen * sPriv,
 453                   __DRIdrawable * dPriv,
 454                   const struct gl_config * visual, GLboolean isPixmap)
 455 {
 456     struct dri_drawable *drawable = NULL;
 457     struct gl_framebuffer *fb;
 458     struct swrast_renderbuffer *frontrb, *backrb;
 459
 460     TRACE;
 461
 462     (void) sPriv;
 463     (void) isPixmap;
 464
 465     drawable = CALLOC_STRUCT(dri_drawable);
 466     if (drawable == NULL)
 467         goto drawable_fail;
 468
 469     dPriv->driverPrivate = drawable;
 470     drawable->dPriv = dPriv;
 471
 472     drawable->row = malloc(MAX_WIDTH * 4);
 473     if (drawable->row == NULL)
 474         goto drawable_fail;
 475
 476     fb = &drawable->Base;
 477
 478     /* basic framebuffer setup */
 479     _mesa_initialize_window_framebuffer(fb, visual);
 480
 481     /* add front renderbuffer */
 482     frontrb = swrast_new_renderbuffer(visual, dPriv, GL_TRUE);
 483     _mesa_add_renderbuffer(fb, BUFFER_FRONT_LEFT, &frontrb->Base);
 484
 485     /* add back renderbuffer */
 486     if (visual->doubleBufferMode) {
 487         backrb = swrast_new_renderbuffer(visual, dPriv, GL_FALSE);
 488         _mesa_add_renderbuffer(fb, BUFFER_BACK_LEFT, &backrb->Base);
 489     }
 490
 491     /* add software renderbuffers */
 492     _swrast_add_soft_renderbuffers(fb,
 493                                    GL_FALSE, /* color */
 494                                    visual->haveDepthBuffer,
 495                                    visual->haveStencilBuffer,
 496                                    visual->haveAccumBuffer,
 497                                    GL_FALSE, /* alpha */
 498                                    GL_FALSE /* aux bufs */);
 499
 500     return GL_TRUE;
 501
 502 drawable_fail:
 503
 504     if (drawable)
 505         free(drawable->row);
 506
 507     FREE(drawable);
 508
 509     return GL_FALSE;
 510 }
 511
 512 static void
 513 dri_destroy_buffer(__DRIdrawable * dPriv)
 514 {
 515     TRACE;
 516
 517     if (dPriv) {
 518         struct dri_drawable *drawable = dri_drawable(dPriv);
 519         struct gl_framebuffer *fb;
 520
 521         free(drawable->row);
 522
 523         fb = &drawable->Base;
 524
 525         fb->DeletePending = GL_TRUE;
 526         _mesa_reference_framebuffer(&fb, NULL);
 527     }
 528 }
 529
 530 static void
 531 dri_swap_buffers(__DRIdrawable * dPriv)
 532 {
 533     __DRIscreen *sPriv = dPriv->driScreenPriv;
 534
 535     GET_CURRENT_CONTEXT(ctx);
 536
 537     struct dri_drawable *drawable = dri_drawable(dPriv);
 538     struct gl_framebuffer *fb;
 539     struct swrast_renderbuffer *frontrb, *backrb;
 540
 541     TRACE;
 542
 543     fb = &drawable->Base;
 544
 545     frontrb =
 546         swrast_renderbuffer(fb->Attachment[BUFFER_FRONT_LEFT].Renderbuffer);
 547     backrb =
 548         swrast_renderbuffer(fb->Attachment[BUFFER_BACK_LEFT].Renderbuffer);
 549
 550     /* check for signle-buffered */
 551     if (backrb == NULL)
 552         return;
 553
 554     /* check if swapping currently bound buffer */
 555     if (ctx && ctx->DrawBuffer == fb) {
 556         /* flush pending rendering */
 557         _mesa_notifySwapBuffers(ctx);
 558     }
 559
 560     sPriv->swrast_loader->putImage(dPriv, __DRI_SWRAST_IMAGE_OP_SWAP,
 561                                    0, 0,
 562                                    frontrb->Base.Width,
 563                                    frontrb->Base.Height,
 564                                    backrb->Base.Data,
 565                                    dPriv->loaderPrivate);
 566 }
 567
 568
 569 /**
 570  * General device driver functions.
 571  */
 572
 573 static void
 574 get_window_size( struct gl_framebuffer *fb, GLsizei *w, GLsizei *h )
 575 {
 576     __DRIdrawable *dPriv = swrast_drawable(fb)->dPriv;
 577     __DRIscreen *sPriv = dPriv->driScreenPriv;
 578     int x, y;
 579
 580     sPriv->swrast_loader->getDrawableInfo(dPriv,
 581                                           &x, &y, w, h,
 582                                           dPriv->loaderPrivate);
 583 }
 584
 585 static void
 586 swrast_check_and_update_window_size( struct gl_context *ctx, struct gl_framebuffer *fb )
 587 {
 588     GLsizei width, height;
 589
 590     get_window_size(fb, &width, &height);
 591     if (fb->Width != width || fb->Height != height) {
 592         _mesa_resize_framebuffer(ctx, fb, width, height);
 593     }
 594 }
 595
 596 static const GLubyte *
 597 get_string(struct gl_context *ctx, GLenum pname)
 598 {
 599     (void) ctx;
 600     switch (pname) {
 601         case GL_VENDOR:
 602             return (const GLubyte *) "Mesa Project";
 603         case GL_RENDERER:
 604             return (const GLubyte *) "Software Rasterizer";
 605         default:
 606             return NULL;
 607     }
 608 }
 609
 610 static void
 611 update_state( struct gl_context *ctx, GLuint new_state )
 612 {
 613     /* not much to do here - pass it on */
 614     _swrast_InvalidateState( ctx, new_state );
 615     _swsetup_InvalidateState( ctx, new_state );
 616     _vbo_InvalidateState( ctx, new_state );
 617     _tnl_InvalidateState( ctx, new_state );
 618 }
 619
 620 static void
 621 viewport(struct gl_context *ctx, GLint x, GLint y, GLsizei w, GLsizei h)
 622 {
 623     struct gl_framebuffer *draw = ctx->WinSysDrawBuffer;
 624     struct gl_framebuffer *read = ctx->WinSysReadBuffer;
 625
 626     (void) x;
 627     (void) y;
 628     (void) w;
 629     (void) h;
 630     swrast_check_and_update_window_size(ctx, draw);
 631     swrast_check_and_update_window_size(ctx, read);
 632 }
 633
 634 static gl_format swrastChooseTextureFormat(struct gl_context * ctx,
 635                                            GLint internalFormat,
 636                                            GLenum format,
 637                                            GLenum type)
 638 {
 639     if (internalFormat == GL_RGB)
 640         return MESA_FORMAT_XRGB8888;
 641     return _mesa_choose_tex_format(ctx, internalFormat, format, type);
 642 }
 643
 644 static void
 645 swrast_init_driver_functions(struct dd_function_table *driver)
 646 {
 647     driver->GetString = get_string;
 648     driver->UpdateState = update_state;
 649     driver->GetBufferSize = NULL;
 650     driver->Viewport = viewport;
 651     driver->ChooseTextureFormat = swrastChooseTextureFormat;
 652     driver->MapRenderbuffer = swrast_map_renderbuffer;
 653     driver->UnmapRenderbuffer = swrast_unmap_renderbuffer;
 654 }
 655
 656 static const char *es2_extensions[] = {
 657    /* Used by mesa internally (cf all_mesa_extensions in ../common/utils.c) */
 658    "GL_ARB_transpose_matrix",
 659    "GL_ARB_window_pos",
 660    "GL_EXT_blend_func_separate",
 661    "GL_EXT_compiled_vertex_array",
 662    "GL_EXT_framebuffer_blit",
 663    "GL_IBM_multimode_draw_arrays",
 664    "GL_MESA_window_pos",
 665    "GL_NV_vertex_program",
 666
 667    /* Required by GLES2 */
 668    "GL_ARB_fragment_program",
 669    "GL_ARB_fragment_shader",
 670    "GL_ARB_shader_objects",
 671    "GL_ARB_texture_cube_map",
 672    "GL_ARB_texture_non_power_of_two",
 673    "GL_ARB_vertex_shader",
 674    "GL_EXT_blend_color",
 675    "GL_EXT_blend_equation_separate",
 676    "GL_EXT_blend_minmax",
 677
 678    /* Optional GLES2 */
 679    "GL_ARB_framebuffer_object",
 680    "GL_EXT_texture_filter_anisotropic",
 681    "GL_ARB_depth_texture",
 682    "GL_EXT_packed_depth_stencil",
 683    "GL_EXT_framebuffer_object",
 684    NULL,
 685 };
 686
 687 static void
 688 InitExtensionsES2(struct gl_context *ctx)
 689 {
 690    int i;
 691
 692    for (i = 0; es2_extensions[i]; i++)
 693       _mesa_enable_extension(ctx, es2_extensions[i]);
 694 }
 695
 696 /**
 697  * Context-related functions.
 698  */
 699
 700 static GLboolean
 701 dri_create_context(gl_api api,
 702                    const struct gl_config * visual,
 703                    __DRIcontext * cPriv,
 704                    unsigned major_version,
 705                    unsigned minor_version,
 706                    uint32_t flags,
 707                    unsigned *error,
 708                    void *sharedContextPrivate)
 709 {
 710     struct dri_context *ctx = NULL;
 711     struct dri_context *share = (struct dri_context *)sharedContextPrivate;
 712     struct gl_context *mesaCtx = NULL;
 713     struct gl_context *sharedCtx = NULL;
 714     struct dd_function_table functions;
 715
 716     TRACE;
 717
 718     /* Flag filtering is handled in dri2CreateContextAttribs.
 719      */
 720     (void) flags;
 721
 722     if (api == API_OPENGL
 723         && (major_version > 2
 724             || (major_version == 2 && minor_version > 1))) {
 725        *error = __DRI_CTX_ERROR_BAD_VERSION;
 726        goto context_fail;
 727     }
 728
 729     ctx = CALLOC_STRUCT(dri_context);
 730     if (ctx == NULL) {
 731         *error = __DRI_CTX_ERROR_NO_MEMORY;
 732         goto context_fail;
 733     }
 734
 735     cPriv->driverPrivate = ctx;
 736     ctx->cPriv = cPriv;
 737
 738     /* build table of device driver functions */
 739     _mesa_init_driver_functions(&functions);
 740     swrast_init_driver_functions(&functions);
 741
 742     if (share) {
 743         sharedCtx = &share->Base;
 744     }
 745
 746     mesaCtx = &ctx->Base;
 747
 748     /* basic context setup */
 749     if (!_mesa_initialize_context(mesaCtx, api, visual, sharedCtx, &functions, (void *) cPriv)) {
 750         *error = __DRI_CTX_ERROR_NO_MEMORY;
 751         goto context_fail;
 752     }
 753
 754     /* do bounds checking to prevent segfaults and server crashes! */
 755     mesaCtx->Const.CheckArrayBounds = GL_TRUE;
 756
 757     /* create module contexts */
 758     _swrast_CreateContext( mesaCtx );
 759     _vbo_CreateContext( mesaCtx );
 760     _tnl_CreateContext( mesaCtx );
 761     _swsetup_CreateContext( mesaCtx );
 762     _swsetup_Wakeup( mesaCtx );
 763
 764     /* use default TCL pipeline */
 765     {
 766        TNLcontext *tnl = TNL_CONTEXT(mesaCtx);
 767        tnl->Driver.RunPipeline = _tnl_run_pipeline;
 768     }
 769
 770     _mesa_meta_init(mesaCtx);
 771     _mesa_enable_sw_extensions(mesaCtx);
 772
 773     switch (api) {
 774     case API_OPENGL:
 775         _mesa_enable_1_3_extensions(mesaCtx);
 776         _mesa_enable_1_4_extensions(mesaCtx);
 777         _mesa_enable_1_5_extensions(mesaCtx);
 778         _mesa_enable_2_0_extensions(mesaCtx);
 779         _mesa_enable_2_1_extensions(mesaCtx);
 780         break;
 781     case API_OPENGLES:
 782         _mesa_enable_1_3_extensions(mesaCtx);
 783         _mesa_enable_1_4_extensions(mesaCtx);
 784         _mesa_enable_1_5_extensions(mesaCtx);
 785
 786         break;
 787     case API_OPENGLES2:
 788         InitExtensionsES2( mesaCtx);
 789         break;
 790     }
 791
 792     *error = __DRI_CTX_ERROR_SUCCESS;
 793     return GL_TRUE;
 794
 795 context_fail:
 796
 797     FREE(ctx);
 798
 799     return GL_FALSE;
 800 }
 801
 802 static void
 803 dri_destroy_context(__DRIcontext * cPriv)
 804 {
 805     TRACE;
 806
 807     if (cPriv) {
 808         struct dri_context *ctx = dri_context(cPriv);
 809         struct gl_context *mesaCtx;
 810
 811         mesaCtx = &ctx->Base;
 812
 813         _mesa_meta_free(mesaCtx);
 814         _swsetup_DestroyContext( mesaCtx );
 815         _swrast_DestroyContext( mesaCtx );
 816         _tnl_DestroyContext( mesaCtx );
 817         _vbo_DestroyContext( mesaCtx );
 818         _mesa_destroy_context( mesaCtx );
 819     }
 820 }
 821
 822 static GLboolean
 823 dri_make_current(__DRIcontext * cPriv,
 824                  __DRIdrawable * driDrawPriv,
 825                  __DRIdrawable * driReadPriv)
 826 {
 827     struct gl_context *mesaCtx;
 828     struct gl_framebuffer *mesaDraw;
 829     struct gl_framebuffer *mesaRead;
 830     TRACE;
 831
 832     if (cPriv) {
 833         struct dri_context *ctx = dri_context(cPriv);
 834         struct dri_drawable *draw;
 835         struct dri_drawable *read;
 836
 837         if (!driDrawPriv || !driReadPriv)
 838             return GL_FALSE;
 839
 840         draw = dri_drawable(driDrawPriv);
 841         read = dri_drawable(driReadPriv);
 842         mesaCtx = &ctx->Base;
 843         mesaDraw = &draw->Base;
 844         mesaRead = &read->Base;
 845
 846         /* check for same context and buffer */
 847         if (mesaCtx == _mesa_get_current_context()
 848             && mesaCtx->DrawBuffer == mesaDraw
 849             && mesaCtx->ReadBuffer == mesaRead) {
 850             return GL_TRUE;
 851         }
 852
 853         _glapi_check_multithread();
 854
 855         swrast_check_and_update_window_size(mesaCtx, mesaDraw);
 856         if (mesaRead != mesaDraw)
 857             swrast_check_and_update_window_size(mesaCtx, mesaRead);
 858
 859         _mesa_make_current( mesaCtx,
 860                             mesaDraw,
 861                             mesaRead );
 862     }
 863     else {
 864         /* unbind */
 865         _mesa_make_current( NULL, NULL, NULL );
 866     }
 867
 868     return GL_TRUE;
 869 }
 870
 871 static GLboolean
 872 dri_unbind_context(__DRIcontext * cPriv)
 873 {
 874     TRACE;
 875     (void) cPriv;
 876
 877     /* Unset current context and dispath table */
 878     _mesa_make_current(NULL, NULL, NULL);
 879
 880     return GL_TRUE;
 881 }
 882
 883
 884 const struct __DriverAPIRec driDriverAPI = {
 885     .InitScreen = dri_init_screen,
 886     .DestroyScreen = dri_destroy_screen,
 887     .CreateContext = dri_create_context,
 888     .DestroyContext = dri_destroy_context,
 889     .CreateBuffer = dri_create_buffer,
 890     .DestroyBuffer = dri_destroy_buffer,
 891     .SwapBuffers = dri_swap_buffers,
 892     .MakeCurrent = dri_make_current,
 893     .UnbindContext = dri_unbind_context,
 894 };
 895
 896 /* This is the table of extensions that the loader will dlsym() for. */
 897 PUBLIC const __DRIextension *__driDriverExtensions[] = {
 898     &driCoreExtension.base,
 899     &driSWRastExtension.base,
 900     NULL
 901 };