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