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  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
  18  * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
  19  * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
  20  * OTHER DEALINGS IN THE SOFTWARE.
  21  */
  22
  23 /*
  24  * DRI software rasterizer
  25  *
  26  * This is the mesa swrast module packaged into a DRI driver structure.
  27  *
  28  * The front-buffer is allocated by the loader. The loader provides read/write
  29  * callbacks for access to the front-buffer. The driver uses a scratch row for
  30  * front-buffer rendering to avoid repeated calls to the loader.
  31  *
  32  * The back-buffer is allocated by the driver and is private.
  33  */
  34
  35 #include "main/api_exec.h"
  36 #include "main/context.h"
  37 #include "main/extensions.h"
  38 #include "main/formats.h"
  39 #include "main/framebuffer.h"
  40 #include "main/imports.h"
  41 #include "main/renderbuffer.h"
  42 #include "main/version.h"
  43 #include "main/vtxfmt.h"
  44 #include "swrast/swrast.h"
  45 #include "swrast/s_renderbuffer.h"
  46 #include "swrast_setup/swrast_setup.h"
  47 #include "tnl/tnl.h"
  48 #include "tnl/t_context.h"
  49 #include "tnl/t_pipeline.h"
  50 #include "vbo/vbo.h"
  51 #include "drivers/common/driverfuncs.h"
  52 #include "drivers/common/meta.h"
  53 #include "utils.h"
  54
  55 #include "main/teximage.h"
  56 #include "main/texformat.h"
  57 #include "main/texstate.h"
  58
  59 #include "swrast_priv.h"
  60 #include "swrast/s_context.h"
  61
  62 const __DRIextension **__driDriverGetExtensions_swrast(void);
  63
  64 /**
  65  * Screen and config-related functions
  66  */
  67
  68 static void swrastSetTexBuffer2(__DRIcontext *pDRICtx, GLint target,
  69                                 GLint texture_format, __DRIdrawable *dPriv)
  70 {
  71     struct dri_context *dri_ctx;
  72     int x, y, w, h;
  73     __DRIscreen *sPriv = dPriv->driScreenPriv;
  74     struct gl_texture_unit *texUnit;
  75     struct gl_texture_object *texObj;
  76     struct gl_texture_image *texImage;
  77     struct swrast_texture_image *swImage;
  78     uint32_t internalFormat;
  79     gl_format texFormat;
  80
  81     dri_ctx = pDRICtx->driverPrivate;
  82
  83     internalFormat = (texture_format == __DRI_TEXTURE_FORMAT_RGB ? 3 : 4);
  84
  85     texUnit = _mesa_get_current_tex_unit(&dri_ctx->Base);
  86     texObj = _mesa_select_tex_object(&dri_ctx->Base, texUnit, target);
  87     texImage = _mesa_get_tex_image(&dri_ctx->Base, texObj, target, 0);
  88     swImage = swrast_texture_image(texImage);
  89
  90     _mesa_lock_texture(&dri_ctx->Base, texObj);
  91
  92     sPriv->swrast_loader->getDrawableInfo(dPriv, &x, &y, &w, &h, dPriv->loaderPrivate);
  93
  94     if (texture_format == __DRI_TEXTURE_FORMAT_RGB)
  95         texFormat = MESA_FORMAT_XRGB8888;
  96     else
  97         texFormat = MESA_FORMAT_ARGB8888;
  98
  99     _mesa_init_teximage_fields(&dri_ctx->Base, texImage,
 100                                w, h, 1, 0, internalFormat, texFormat);
 101
 102     sPriv->swrast_loader->getImage(dPriv, x, y, w, h, (char *)swImage->Buffer,
 103                                    dPriv->loaderPrivate);
 104
 105     _mesa_unlock_texture(&dri_ctx->Base, texObj);
 106 }
 107
 108 static void swrastSetTexBuffer(__DRIcontext *pDRICtx, GLint target,
 109                                __DRIdrawable *dPriv)
 110 {
 111     swrastSetTexBuffer2(pDRICtx, target, __DRI_TEXTURE_FORMAT_RGBA, dPriv);
 112 }
 113
 114 static const __DRItexBufferExtension swrastTexBufferExtension = {
 115     { __DRI_TEX_BUFFER, __DRI_TEX_BUFFER_VERSION },
 116     swrastSetTexBuffer,
 117     swrastSetTexBuffer2,
 118 };
 119
 120 static const __DRIextension *dri_screen_extensions[] = {
 121     &swrastTexBufferExtension.base,
 122     NULL
 123 };
 124
 125 static __DRIconfig **
 126 swrastFillInModes(__DRIscreen *psp,
 127                   unsigned pixel_bits, unsigned depth_bits,
 128                   unsigned stencil_bits, GLboolean have_back_buffer)
 129 {
 130     __DRIconfig **configs;
 131     unsigned depth_buffer_factor;
 132     unsigned back_buffer_factor;
 133     gl_format format;
 134
 135     /* GLX_SWAP_COPY_OML is only supported because the Intel driver doesn't
 136      * support pageflipping at all.
 137      */
 138     static const GLenum back_buffer_modes[] = {
 139         GLX_NONE, GLX_SWAP_UNDEFINED_OML
 140     };
 141
 142     uint8_t depth_bits_array[4];
 143     uint8_t stencil_bits_array[4];
 144     uint8_t msaa_samples_array[1];
 145
 146     (void) psp;
 147     (void) have_back_buffer;
 148
 149     depth_bits_array[0] = 0;
 150     depth_bits_array[1] = 0;
 151     depth_bits_array[2] = depth_bits;
 152     depth_bits_array[3] = depth_bits;
 153
 154     /* Just like with the accumulation buffer, always provide some modes
 155      * with a stencil buffer.
 156      */
 157     stencil_bits_array[0] = 0;
 158     stencil_bits_array[1] = (stencil_bits == 0) ? 8 : stencil_bits;
 159     stencil_bits_array[2] = 0;
 160     stencil_bits_array[3] = (stencil_bits == 0) ? 8 : stencil_bits;
 161
 162     msaa_samples_array[0] = 0;
 163
 164     depth_buffer_factor = 4;
 165     back_buffer_factor = 2;
 166
 167     switch (pixel_bits) {
 168     case 16:
 169         format = MESA_FORMAT_RGB565;
 170         break;
 171     case 24:
 172         format = MESA_FORMAT_XRGB8888;
 173         break;
 174     case 32:
 175         format = MESA_FORMAT_ARGB8888;
 176         break;
 177     default:
 178         fprintf(stderr, "[%s:%u] bad depth %d\n", __func__, __LINE__,
 179                 pixel_bits);
 180         return NULL;
 181     }
 182
 183     configs = driCreateConfigs(format,
 184                                depth_bits_array, stencil_bits_array,
 185                                depth_buffer_factor, back_buffer_modes,
 186                                back_buffer_factor, msaa_samples_array, 1,
 187                                GL_TRUE);
 188     if (configs == NULL) {
 189         fprintf(stderr, "[%s:%u] Error creating FBConfig!\n", __func__,
 190                 __LINE__);
 191         return NULL;
 192     }
 193
 194     return configs;
 195 }
 196
 197 static const __DRIconfig **
 198 dri_init_screen(__DRIscreen * psp)
 199 {
 200     __DRIconfig **configs16, **configs24, **configs32;
 201
 202     TRACE;
 203
 204     psp->max_gl_compat_version = 21;
 205     psp->max_gl_es1_version = 11;
 206     psp->max_gl_es2_version = 20;
 207
 208     psp->extensions = dri_screen_extensions;
 209
 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     configs24 = driConcatConfigs(configs16, configs24);
 215     configs32 = driConcatConfigs(configs24, configs32);
 216
 217     return (const __DRIconfig **)configs32;
 218 }
 219
 220 static void
 221 dri_destroy_screen(__DRIscreen * sPriv)
 222 {
 223     TRACE;
 224     (void) sPriv;
 225 }
 226
 227
 228 /**
 229  * Framebuffer and renderbuffer-related functions.
 230  */
 231
 232 static GLuint
 233 choose_pixel_format(const struct gl_config *v)
 234 {
 235     int depth = v->rgbBits;
 236
 237     if (depth == 32
 238         && v->redMask   == 0xff0000
 239         && v->greenMask == 0x00ff00
 240         && v->blueMask  == 0x0000ff)
 241         return PF_A8R8G8B8;
 242     else if (depth == 24
 243              && v->redMask   == 0xff0000
 244              && v->greenMask == 0x00ff00
 245              && v->blueMask  == 0x0000ff)
 246         return PF_X8R8G8B8;
 247     else if (depth == 16
 248              && v->redMask   == 0xf800
 249              && v->greenMask == 0x07e0
 250              && v->blueMask  == 0x001f)
 251         return PF_R5G6B5;
 252     else if (depth == 8
 253              && v->redMask   == 0x07
 254              && v->greenMask == 0x38
 255              && v->blueMask  == 0xc0)
 256         return PF_R3G3B2;
 257
 258     _mesa_problem( NULL, "unexpected format in %s", __FUNCTION__ );
 259     return 0;
 260 }
 261
 262 static void
 263 swrast_delete_renderbuffer(struct gl_context *ctx, struct gl_renderbuffer *rb)
 264 {
 265     struct dri_swrast_renderbuffer *xrb = dri_swrast_renderbuffer(rb);
 266
 267     TRACE;
 268
 269     free(xrb->Base.Buffer);
 270     _mesa_delete_renderbuffer(ctx, rb);
 271 }
 272
 273 /* see bytes_per_line in libGL */
 274 static INLINE int
 275 bytes_per_line(unsigned pitch_bits, unsigned mul)
 276 {
 277    unsigned mask = mul - 1;
 278
 279    return ((pitch_bits + mask) & ~mask) / 8;
 280 }
 281
 282 static GLboolean
 283 swrast_alloc_front_storage(struct gl_context *ctx, struct gl_renderbuffer *rb,
 284                            GLenum internalFormat, GLuint width, GLuint height)
 285 {
 286     struct dri_swrast_renderbuffer *xrb = dri_swrast_renderbuffer(rb);
 287
 288     TRACE;
 289
 290     (void) ctx;
 291     (void) internalFormat;
 292
 293     xrb->Base.Buffer = NULL;
 294     rb->Width = width;
 295     rb->Height = height;
 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 dri_swrast_renderbuffer *xrb = dri_swrast_renderbuffer(rb);
 306
 307     TRACE;
 308
 309     free(xrb->Base.Buffer);
 310
 311     swrast_alloc_front_storage(ctx, rb, internalFormat, width, height);
 312
 313     xrb->Base.Buffer = malloc(height * xrb->pitch);
 314
 315     return GL_TRUE;
 316 }
 317
 318 static struct dri_swrast_renderbuffer *
 319 swrast_new_renderbuffer(const struct gl_config *visual, __DRIdrawable *dPriv,
 320                         GLboolean front)
 321 {
 322     struct dri_swrast_renderbuffer *xrb = calloc(1, sizeof *xrb);
 323     struct gl_renderbuffer *rb;
 324     GLuint pixel_format;
 325
 326     TRACE;
 327
 328     if (!xrb)
 329         return NULL;
 330
 331     rb = &xrb->Base.Base;
 332
 333     _mesa_init_renderbuffer(rb, 0);
 334
 335     pixel_format = choose_pixel_format(visual);
 336
 337     xrb->dPriv = dPriv;
 338     xrb->Base.Base.Delete = swrast_delete_renderbuffer;
 339     if (front) {
 340         rb->AllocStorage = swrast_alloc_front_storage;
 341     }
 342     else {
 343         rb->AllocStorage = swrast_alloc_back_storage;
 344     }
 345
 346     switch (pixel_format) {
 347     case PF_A8R8G8B8:
 348         rb->Format = MESA_FORMAT_ARGB8888;
 349         rb->InternalFormat = GL_RGBA;
 350         rb->_BaseFormat = GL_RGBA;
 351         xrb->bpp = 32;
 352         break;
 353     case PF_X8R8G8B8:
 354         rb->Format = MESA_FORMAT_ARGB8888; /* XXX */
 355         rb->InternalFormat = GL_RGB;
 356         rb->_BaseFormat = GL_RGB;
 357         xrb->bpp = 32;
 358         break;
 359     case PF_R5G6B5:
 360         rb->Format = MESA_FORMAT_RGB565;
 361         rb->InternalFormat = GL_RGB;
 362         rb->_BaseFormat = GL_RGB;
 363         xrb->bpp = 16;
 364         break;
 365     case PF_R3G3B2:
 366         rb->Format = MESA_FORMAT_RGB332;
 367         rb->InternalFormat = GL_RGB;
 368         rb->_BaseFormat = GL_RGB;
 369         xrb->bpp = 8;
 370         break;
 371     default:
 372         free(xrb);
 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 dri_swrast_renderbuffer *xrb = dri_swrast_renderbuffer(rb);
 388    GLubyte *map = xrb->Base.Buffer;
 389    int cpp = _mesa_get_format_bytes(rb->Format);
 390    int stride = rb->Width * 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       xrb->Base.Buffer = malloc(h * stride);
 404
 405       sPriv->swrast_loader->getImage(dPriv, x, rb->Height - y - h, w, h,
 406                                      (char *) xrb->Base.Buffer,
 407                                      dPriv->loaderPrivate);
 408
 409       *out_map = xrb->Base.Buffer + (h - 1) * stride;
 410       *out_stride = -stride;
 411       return;
 412    }
 413
 414    ASSERT(xrb->Base.Buffer);
 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 dri_swrast_renderbuffer *xrb = dri_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                                         (char *) xrb->Base.Buffer,
 443                                         dPriv->loaderPrivate);
 444       }
 445
 446       free(xrb->Base.Buffer);
 447       xrb->Base.Buffer = 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 dri_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(SWRAST_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.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.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 dri_swrast_renderbuffer *frontrb, *backrb;
 540
 541     TRACE;
 542
 543     fb = &drawable->Base;
 544
 545     frontrb =
 546         dri_swrast_renderbuffer(fb->Attachment[BUFFER_FRONT_LEFT].Renderbuffer);
 547     backrb =
 548         dri_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.Base.Width,
 563                                    frontrb->Base.Base.Height,
 564                                    (char *) backrb->Base.Buffer,
 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                                            GLenum target,
 636                                            GLint internalFormat,
 637                                            GLenum format,
 638                                            GLenum type)
 639 {
 640     if (internalFormat == GL_RGB)
 641         return MESA_FORMAT_XRGB8888;
 642     return _mesa_choose_tex_format(ctx, target, internalFormat, format, type);
 643 }
 644
 645 static void
 646 swrast_init_driver_functions(struct dd_function_table *driver)
 647 {
 648     driver->GetString = get_string;
 649     driver->UpdateState = update_state;
 650     driver->Viewport = viewport;
 651     driver->ChooseTextureFormat = swrastChooseTextureFormat;
 652     driver->MapRenderbuffer = swrast_map_renderbuffer;
 653     driver->UnmapRenderbuffer = swrast_unmap_renderbuffer;
 654 }
 655
 656 /**
 657  * Context-related functions.
 658  */
 659
 660 static GLboolean
 661 dri_create_context(gl_api api,
 662                    const struct gl_config * visual,
 663                    __DRIcontext * cPriv,
 664                    unsigned major_version,
 665                    unsigned minor_version,
 666                    uint32_t flags,
 667                    bool notify_reset,
 668                    unsigned *error,
 669                    void *sharedContextPrivate)
 670 {
 671     struct dri_context *ctx = NULL;
 672     struct dri_context *share = (struct dri_context *)sharedContextPrivate;
 673     struct gl_context *mesaCtx = NULL;
 674     struct gl_context *sharedCtx = NULL;
 675     struct dd_function_table functions;
 676
 677     TRACE;
 678
 679     /* Flag filtering is handled in dri2CreateContextAttribs.
 680      */
 681     (void) flags;
 682
 683     ctx = CALLOC_STRUCT(dri_context);
 684     if (ctx == NULL) {
 685         *error = __DRI_CTX_ERROR_NO_MEMORY;
 686         goto context_fail;
 687     }
 688
 689     cPriv->driverPrivate = ctx;
 690     ctx->cPriv = cPriv;
 691
 692     /* build table of device driver functions */
 693     _mesa_init_driver_functions(&functions);
 694     swrast_init_driver_functions(&functions);
 695
 696     if (share) {
 697         sharedCtx = &share->Base;
 698     }
 699
 700     mesaCtx = &ctx->Base;
 701
 702     /* basic context setup */
 703     if (!_mesa_initialize_context(mesaCtx, api, visual, sharedCtx, &functions)) {
 704         *error = __DRI_CTX_ERROR_NO_MEMORY;
 705         goto context_fail;
 706     }
 707
 708     /* do bounds checking to prevent segfaults and server crashes! */
 709     mesaCtx->Const.CheckArrayBounds = GL_TRUE;
 710
 711     /* create module contexts */
 712     _swrast_CreateContext( mesaCtx );
 713     _vbo_CreateContext( mesaCtx );
 714     _tnl_CreateContext( mesaCtx );
 715     _swsetup_CreateContext( mesaCtx );
 716     _swsetup_Wakeup( mesaCtx );
 717
 718     /* use default TCL pipeline */
 719     {
 720        TNLcontext *tnl = TNL_CONTEXT(mesaCtx);
 721        tnl->Driver.RunPipeline = _tnl_run_pipeline;
 722     }
 723
 724     _mesa_meta_init(mesaCtx);
 725     _mesa_enable_sw_extensions(mesaCtx);
 726
 727     _mesa_compute_version(mesaCtx);
 728
 729     _mesa_initialize_dispatch_tables(mesaCtx);
 730     _mesa_initialize_vbo_vtxfmt(mesaCtx);
 731
 732     *error = __DRI_CTX_ERROR_SUCCESS;
 733     return GL_TRUE;
 734
 735 context_fail:
 736
 737     free(ctx);
 738
 739     return GL_FALSE;
 740 }
 741
 742 static void
 743 dri_destroy_context(__DRIcontext * cPriv)
 744 {
 745     TRACE;
 746
 747     if (cPriv) {
 748         struct dri_context *ctx = dri_context(cPriv);
 749         struct gl_context *mesaCtx;
 750
 751         mesaCtx = &ctx->Base;
 752
 753         _mesa_meta_free(mesaCtx);
 754         _swsetup_DestroyContext( mesaCtx );
 755         _swrast_DestroyContext( mesaCtx );
 756         _tnl_DestroyContext( mesaCtx );
 757         _vbo_DestroyContext( mesaCtx );
 758         _mesa_destroy_context( mesaCtx );
 759     }
 760 }
 761
 762 static GLboolean
 763 dri_make_current(__DRIcontext * cPriv,
 764                  __DRIdrawable * driDrawPriv,
 765                  __DRIdrawable * driReadPriv)
 766 {
 767     struct gl_context *mesaCtx;
 768     struct gl_framebuffer *mesaDraw;
 769     struct gl_framebuffer *mesaRead;
 770     TRACE;
 771
 772     if (cPriv) {
 773         struct dri_context *ctx = dri_context(cPriv);
 774         struct dri_drawable *draw;
 775         struct dri_drawable *read;
 776
 777         if (!driDrawPriv || !driReadPriv)
 778             return GL_FALSE;
 779
 780         draw = dri_drawable(driDrawPriv);
 781         read = dri_drawable(driReadPriv);
 782         mesaCtx = &ctx->Base;
 783         mesaDraw = &draw->Base;
 784         mesaRead = &read->Base;
 785
 786         /* check for same context and buffer */
 787         if (mesaCtx == _mesa_get_current_context()
 788             && mesaCtx->DrawBuffer == mesaDraw
 789             && mesaCtx->ReadBuffer == mesaRead) {
 790             return GL_TRUE;
 791         }
 792
 793         _glapi_check_multithread();
 794
 795         swrast_check_and_update_window_size(mesaCtx, mesaDraw);
 796         if (mesaRead != mesaDraw)
 797             swrast_check_and_update_window_size(mesaCtx, mesaRead);
 798
 799         _mesa_make_current( mesaCtx,
 800                             mesaDraw,
 801                             mesaRead );
 802     }
 803     else {
 804         /* unbind */
 805         _mesa_make_current( NULL, NULL, NULL );
 806     }
 807
 808     return GL_TRUE;
 809 }
 810
 811 static GLboolean
 812 dri_unbind_context(__DRIcontext * cPriv)
 813 {
 814     TRACE;
 815     (void) cPriv;
 816
 817     /* Unset current context and dispath table */
 818     _mesa_make_current(NULL, NULL, NULL);
 819
 820     return GL_TRUE;
 821 }
 822
 823 static void
 824 dri_copy_sub_buffer(__DRIdrawable *dPriv, int x, int y,
 825                     int w, int h)
 826 {
 827     __DRIscreen *sPriv = dPriv->driScreenPriv;
 828     void *data;
 829     int iy;
 830     struct dri_drawable *drawable = dri_drawable(dPriv);
 831     struct gl_framebuffer *fb;
 832     struct dri_swrast_renderbuffer *frontrb, *backrb;
 833
 834     TRACE;
 835
 836     fb = &drawable->Base;
 837
 838     frontrb =
 839         dri_swrast_renderbuffer(fb->Attachment[BUFFER_FRONT_LEFT].Renderbuffer);
 840     backrb =
 841         dri_swrast_renderbuffer(fb->Attachment[BUFFER_BACK_LEFT].Renderbuffer);
 842
 843     /* check for signle-buffered */
 844     if (backrb == NULL)
 845        return;
 846
 847     iy = frontrb->Base.Base.Height - y - h;
 848     data = (char *)backrb->Base.Buffer + (iy * backrb->pitch) + (x * ((backrb->bpp + 7) / 8));
 849     sPriv->swrast_loader->putImage2(dPriv, __DRI_SWRAST_IMAGE_OP_SWAP,
 850                                     x, iy, w, h,
 851                                     frontrb->pitch,
 852                                     data,
 853                                     dPriv->loaderPrivate);
 854 }
 855
 856
 857 static const struct __DriverAPIRec swrast_driver_api = {
 858     .InitScreen = dri_init_screen,
 859     .DestroyScreen = dri_destroy_screen,
 860     .CreateContext = dri_create_context,
 861     .DestroyContext = dri_destroy_context,
 862     .CreateBuffer = dri_create_buffer,
 863     .DestroyBuffer = dri_destroy_buffer,
 864     .SwapBuffers = dri_swap_buffers,
 865     .MakeCurrent = dri_make_current,
 866     .UnbindContext = dri_unbind_context,
 867     .CopySubBuffer = dri_copy_sub_buffer,
 868 };
 869
 870 static const struct __DRIDriverVtableExtensionRec swrast_vtable = {
 871    .base = { __DRI_DRIVER_VTABLE, 1 },
 872    .vtable = &swrast_driver_api,
 873 };
 874
 875 static const __DRIextension *swrast_driver_extensions[] = {
 876     &driCoreExtension.base,
 877     &driSWRastExtension.base,
 878     &driCopySubBufferExtension.base,
 879     &swrast_vtable.base,
 880     NULL
 881 };
 882
 883 PUBLIC const __DRIextension **__driDriverGetExtensions_swrast(void)
 884 {
 885    globalDriverAPI = &swrast_driver_api;
 886
 887    return swrast_driver_extensions;
 888 }