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_setup/swrast_setup.h"
  42 #include "tnl/tnl.h"
  43 #include "tnl/t_context.h"
  44 #include "tnl/t_pipeline.h"
  45 #include "vbo/vbo.h"
  46 #include "drivers/common/driverfuncs.h"
  47 #include "drivers/common/meta.h"
  48 #include "utils.h"
  49
  50 #include "swrast_priv.h"
  51
  52
  53 /**
  54  * Screen and config-related functions
  55  */
  56
  57 static const __DRIextension *dri_screen_extensions[] = {
  58     NULL
  59 };
  60
  61 static __DRIconfig **
  62 swrastFillInModes(__DRIscreen *psp,
  63                   unsigned pixel_bits, unsigned depth_bits,
  64                   unsigned stencil_bits, GLboolean have_back_buffer)
  65 {
  66     __DRIconfig **configs;
  67     unsigned depth_buffer_factor;
  68     unsigned back_buffer_factor;
  69     GLenum fb_format;
  70     GLenum fb_type;
  71
  72     /* GLX_SWAP_COPY_OML is only supported because the Intel driver doesn't
  73      * support pageflipping at all.
  74      */
  75     static const GLenum back_buffer_modes[] = {
  76         GLX_NONE, GLX_SWAP_UNDEFINED_OML
  77     };
  78
  79     uint8_t depth_bits_array[4];
  80     uint8_t stencil_bits_array[4];
  81     uint8_t msaa_samples_array[1];
  82
  83     depth_bits_array[0] = 0;
  84     depth_bits_array[1] = 0;
  85     depth_bits_array[2] = depth_bits;
  86     depth_bits_array[3] = depth_bits;
  87
  88     /* Just like with the accumulation buffer, always provide some modes
  89      * with a stencil buffer.
  90      */
  91     stencil_bits_array[0] = 0;
  92     stencil_bits_array[1] = (stencil_bits == 0) ? 8 : stencil_bits;
  93     stencil_bits_array[2] = 0;
  94     stencil_bits_array[3] = (stencil_bits == 0) ? 8 : stencil_bits;
  95
  96     msaa_samples_array[0] = 0;
  97
  98     depth_buffer_factor = 4;
  99     back_buffer_factor = 2;
 100
 101     switch (pixel_bits) {
 102     case 8:
 103         fb_format = GL_RGB;
 104         fb_type = GL_UNSIGNED_BYTE_2_3_3_REV;
 105         break;
 106     case 16:
 107         fb_format = GL_RGB;
 108         fb_type = GL_UNSIGNED_SHORT_5_6_5;
 109         break;
 110     case 24:
 111         fb_format = GL_BGR;
 112         fb_type = GL_UNSIGNED_INT_8_8_8_8_REV;
 113         break;
 114     case 32:
 115         fb_format = GL_BGRA;
 116         fb_type = GL_UNSIGNED_INT_8_8_8_8_REV;
 117         break;
 118     default:
 119         fprintf(stderr, "[%s:%u] bad depth %d\n", __func__, __LINE__,
 120                 pixel_bits);
 121         return NULL;
 122     }
 123
 124     configs = driCreateConfigs(fb_format, fb_type,
 125                                depth_bits_array, stencil_bits_array,
 126                                depth_buffer_factor, back_buffer_modes,
 127                                back_buffer_factor, msaa_samples_array, 1,
 128                                GL_TRUE);
 129     if (configs == NULL) {
 130         fprintf(stderr, "[%s:%u] Error creating FBConfig!\n", __func__,
 131                 __LINE__);
 132         return NULL;
 133     }
 134
 135     return configs;
 136 }
 137
 138 static const __DRIconfig **
 139 dri_init_screen(__DRIscreen * psp)
 140 {
 141     __DRIconfig **configs8, **configs16, **configs24, **configs32;
 142
 143     TRACE;
 144
 145     psp->extensions = dri_screen_extensions;
 146
 147     configs8  = swrastFillInModes(psp,  8,  8, 0, 1);
 148     configs16 = swrastFillInModes(psp, 16, 16, 0, 1);
 149     configs24 = swrastFillInModes(psp, 24, 24, 8, 1);
 150     configs32 = swrastFillInModes(psp, 32, 24, 8, 1);
 151
 152     configs16 = driConcatConfigs(configs8, configs16);
 153     configs24 = driConcatConfigs(configs16, configs24);
 154     configs32 = driConcatConfigs(configs24, configs32);
 155
 156     return (const __DRIconfig **)configs32;
 157 }
 158
 159 static void
 160 dri_destroy_screen(__DRIscreen * sPriv)
 161 {
 162     TRACE;
 163 }
 164
 165
 166 /**
 167  * Framebuffer and renderbuffer-related functions.
 168  */
 169
 170 static GLuint
 171 choose_pixel_format(const GLvisual *v)
 172 {
 173     int depth = v->rgbBits;
 174
 175     if (depth == 32
 176         && v->redMask   == 0xff0000
 177         && v->greenMask == 0x00ff00
 178         && v->blueMask  == 0x0000ff)
 179         return PF_A8R8G8B8;
 180     else if (depth == 24
 181              && v->redMask   == 0xff0000
 182              && v->greenMask == 0x00ff00
 183              && v->blueMask  == 0x0000ff)
 184         return PF_X8R8G8B8;
 185     else if (depth == 16
 186              && v->redMask   == 0xf800
 187              && v->greenMask == 0x07e0
 188              && v->blueMask  == 0x001f)
 189         return PF_R5G6B5;
 190     else if (depth == 8
 191              && v->redMask   == 0x07
 192              && v->greenMask == 0x38
 193              && v->blueMask  == 0xc0)
 194         return PF_R3G3B2;
 195
 196     _mesa_problem( NULL, "unexpected format in %s", __FUNCTION__ );
 197     return 0;
 198 }
 199
 200 static void
 201 swrast_delete_renderbuffer(struct gl_renderbuffer *rb)
 202 {
 203     TRACE;
 204
 205     free(rb->Data);
 206     free(rb);
 207 }
 208
 209 static GLboolean
 210 swrast_alloc_front_storage(GLcontext *ctx, struct gl_renderbuffer *rb,
 211                            GLenum internalFormat, GLuint width, GLuint height)
 212 {
 213     struct swrast_renderbuffer *xrb = swrast_renderbuffer(rb);
 214     unsigned mask = PITCH_ALIGN_BITS - 1;
 215
 216     TRACE;
 217
 218     rb->Data = NULL;
 219     rb->Width = width;
 220     rb->Height = height;
 221
 222     /* always pad to PITCH_ALIGN_BITS */
 223     xrb->pitch = ((width * xrb->bpp + mask) & ~mask) / 8;
 224
 225     return GL_TRUE;
 226 }
 227
 228 static GLboolean
 229 swrast_alloc_back_storage(GLcontext *ctx, struct gl_renderbuffer *rb,
 230                           GLenum internalFormat, GLuint width, GLuint height)
 231 {
 232     struct swrast_renderbuffer *xrb = swrast_renderbuffer(rb);
 233
 234     TRACE;
 235
 236     free(rb->Data);
 237
 238     swrast_alloc_front_storage(ctx, rb, internalFormat, width, height);
 239
 240     rb->Data = malloc(height * xrb->pitch);
 241
 242     return GL_TRUE;
 243 }
 244
 245 static struct swrast_renderbuffer *
 246 swrast_new_renderbuffer(const GLvisual *visual, GLboolean front)
 247 {
 248     struct swrast_renderbuffer *xrb = calloc(1, sizeof *xrb);
 249     GLuint pixel_format;
 250
 251     TRACE;
 252
 253     if (!xrb)
 254         return NULL;
 255
 256     _mesa_init_renderbuffer(&xrb->Base, 0);
 257
 258     pixel_format = choose_pixel_format(visual);
 259
 260     xrb->Base.Delete = swrast_delete_renderbuffer;
 261     if (front) {
 262         xrb->Base.AllocStorage = swrast_alloc_front_storage;
 263         swrast_set_span_funcs_front(xrb, pixel_format);
 264     }
 265     else {
 266         xrb->Base.AllocStorage = swrast_alloc_back_storage;
 267         swrast_set_span_funcs_back(xrb, pixel_format);
 268     }
 269
 270     switch (pixel_format) {
 271     case PF_A8R8G8B8:
 272         xrb->Base.Format = MESA_FORMAT_ARGB8888;
 273         xrb->Base.InternalFormat = GL_RGBA;
 274         xrb->Base._BaseFormat = GL_RGBA;
 275         xrb->Base.DataType = GL_UNSIGNED_BYTE;
 276         xrb->bpp = 32;
 277         break;
 278     case PF_X8R8G8B8:
 279         xrb->Base.Format = MESA_FORMAT_ARGB8888; /* XXX */
 280         xrb->Base.InternalFormat = GL_RGB;
 281         xrb->Base._BaseFormat = GL_RGB;
 282         xrb->Base.DataType = GL_UNSIGNED_BYTE;
 283         xrb->bpp = 32;
 284         break;
 285     case PF_R5G6B5:
 286         xrb->Base.Format = MESA_FORMAT_RGB565;
 287         xrb->Base.InternalFormat = GL_RGB;
 288         xrb->Base._BaseFormat = GL_RGB;
 289         xrb->Base.DataType = GL_UNSIGNED_BYTE;
 290         xrb->bpp = 16;
 291         break;
 292     case PF_R3G3B2:
 293         xrb->Base.Format = MESA_FORMAT_RGB332;
 294         xrb->Base.InternalFormat = GL_RGB;
 295         xrb->Base._BaseFormat = GL_RGB;
 296         xrb->Base.DataType = GL_UNSIGNED_BYTE;
 297         xrb->bpp = 8;
 298         break;
 299     default:
 300         return NULL;
 301     }
 302
 303     return xrb;
 304 }
 305
 306 static GLboolean
 307 dri_create_buffer(__DRIscreen * sPriv,
 308                   __DRIdrawable * dPriv,
 309                   const __GLcontextModes * visual, GLboolean isPixmap)
 310 {
 311     struct dri_drawable *drawable = NULL;
 312     GLframebuffer *fb;
 313     struct swrast_renderbuffer *frontrb, *backrb;
 314
 315     TRACE;
 316
 317     drawable = CALLOC_STRUCT(dri_drawable);
 318     if (drawable == NULL)
 319         goto drawable_fail;
 320
 321     dPriv->driverPrivate = drawable;
 322     drawable->dPriv = dPriv;
 323
 324     drawable->row = malloc(MAX_WIDTH * 4);
 325     if (drawable->row == NULL)
 326         goto drawable_fail;
 327
 328     fb = &drawable->Base;
 329
 330     /* basic framebuffer setup */
 331     _mesa_initialize_window_framebuffer(fb, visual);
 332
 333     /* add front renderbuffer */
 334     frontrb = swrast_new_renderbuffer(visual, GL_TRUE);
 335     _mesa_add_renderbuffer(fb, BUFFER_FRONT_LEFT, &frontrb->Base);
 336
 337     /* add back renderbuffer */
 338     if (visual->doubleBufferMode) {
 339         backrb = swrast_new_renderbuffer(visual, GL_FALSE);
 340         _mesa_add_renderbuffer(fb, BUFFER_BACK_LEFT, &backrb->Base);
 341     }
 342
 343     /* add software renderbuffers */
 344     _mesa_add_soft_renderbuffers(fb,
 345                                  GL_FALSE, /* color */
 346                                  visual->haveDepthBuffer,
 347                                  visual->haveStencilBuffer,
 348                                  visual->haveAccumBuffer,
 349                                  GL_FALSE, /* alpha */
 350                                  GL_FALSE /* aux bufs */);
 351
 352     return GL_TRUE;
 353
 354 drawable_fail:
 355
 356     if (drawable)
 357         free(drawable->row);
 358
 359     FREE(drawable);
 360
 361     return GL_FALSE;
 362 }
 363
 364 static void
 365 dri_destroy_buffer(__DRIdrawable * dPriv)
 366 {
 367     TRACE;
 368
 369     if (dPriv) {
 370         struct dri_drawable *drawable = dri_drawable(dPriv);
 371         GLframebuffer *fb;
 372
 373         free(drawable->row);
 374
 375         fb = &drawable->Base;
 376
 377         fb->DeletePending = GL_TRUE;
 378         _mesa_reference_framebuffer(&fb, NULL);
 379     }
 380 }
 381
 382 static void
 383 dri_swap_buffers(__DRIdrawable * dPriv)
 384 {
 385     __DRIscreen *sPriv = dPriv->driScreenPriv;
 386
 387     GET_CURRENT_CONTEXT(ctx);
 388
 389     struct dri_drawable *drawable = dri_drawable(dPriv);
 390     GLframebuffer *fb;
 391     struct swrast_renderbuffer *frontrb, *backrb;
 392
 393     TRACE;
 394
 395     fb = &drawable->Base;
 396
 397     frontrb = swrast_renderbuffer(fb->Attachment[BUFFER_FRONT_LEFT].Renderbuffer);
 398     backrb = swrast_renderbuffer(fb->Attachment[BUFFER_BACK_LEFT].Renderbuffer);
 399
 400     /* check for signle-buffered */
 401     if (backrb == NULL)
 402         return;
 403
 404     /* check if swapping currently bound buffer */
 405     if (ctx && ctx->DrawBuffer == fb) {
 406         /* flush pending rendering */
 407         _mesa_notifySwapBuffers(ctx);
 408     }
 409
 410     sPriv->swrast_loader->putImage(dPriv, __DRI_SWRAST_IMAGE_OP_SWAP,
 411                                    0, 0,
 412                                    frontrb->Base.Width,
 413                                    frontrb->Base.Height,
 414                                    backrb->Base.Data,
 415                                    dPriv->loaderPrivate);
 416 }
 417
 418
 419 /**
 420  * General device driver functions.
 421  */
 422
 423 static void
 424 get_window_size( GLframebuffer *fb, GLsizei *w, GLsizei *h )
 425 {
 426     __DRIdrawable *dPriv = swrast_drawable(fb)->dPriv;
 427     __DRIscreen *sPriv = dPriv->driScreenPriv;
 428     int x, y;
 429
 430     sPriv->swrast_loader->getDrawableInfo(dPriv,
 431                                           &x, &y, w, h,
 432                                           dPriv->loaderPrivate);
 433 }
 434
 435 static void
 436 swrast_check_and_update_window_size( GLcontext *ctx, GLframebuffer *fb )
 437 {
 438     GLsizei width, height;
 439
 440     get_window_size(fb, &width, &height);
 441     if (fb->Width != width || fb->Height != height) {
 442         _mesa_resize_framebuffer(ctx, fb, width, height);
 443     }
 444 }
 445
 446 static const GLubyte *
 447 get_string(GLcontext *ctx, GLenum pname)
 448 {
 449     (void) ctx;
 450     switch (pname) {
 451         case GL_VENDOR:
 452             return (const GLubyte *) "Mesa Project";
 453         case GL_RENDERER:
 454             return (const GLubyte *) "Software Rasterizer";
 455         default:
 456             return NULL;
 457     }
 458 }
 459
 460 static void
 461 update_state( GLcontext *ctx, GLuint new_state )
 462 {
 463     /* not much to do here - pass it on */
 464     _swrast_InvalidateState( ctx, new_state );
 465     _swsetup_InvalidateState( ctx, new_state );
 466     _vbo_InvalidateState( ctx, new_state );
 467     _tnl_InvalidateState( ctx, new_state );
 468 }
 469
 470 static void
 471 viewport(GLcontext *ctx, GLint x, GLint y, GLsizei w, GLsizei h)
 472 {
 473     GLframebuffer *draw = ctx->WinSysDrawBuffer;
 474     GLframebuffer *read = ctx->WinSysReadBuffer;
 475
 476     swrast_check_and_update_window_size(ctx, draw);
 477     swrast_check_and_update_window_size(ctx, read);
 478 }
 479
 480 static void
 481 swrast_init_driver_functions(struct dd_function_table *driver)
 482 {
 483     driver->GetString = get_string;
 484     driver->UpdateState = update_state;
 485     driver->GetBufferSize = NULL;
 486     driver->Viewport = viewport;
 487 }
 488
 489
 490 /**
 491  * Context-related functions.
 492  */
 493
 494 static GLboolean
 495 dri_create_context(const __GLcontextModes * visual,
 496                    __DRIcontext * cPriv, void *sharedContextPrivate)
 497 {
 498     struct dri_context *ctx = NULL;
 499     struct dri_context *share = (struct dri_context *)sharedContextPrivate;
 500     GLcontext *mesaCtx = NULL;
 501     GLcontext *sharedCtx = NULL;
 502     struct dd_function_table functions;
 503
 504     TRACE;
 505
 506     ctx = CALLOC_STRUCT(dri_context);
 507     if (ctx == NULL)
 508         goto context_fail;
 509
 510     cPriv->driverPrivate = ctx;
 511     ctx->cPriv = cPriv;
 512
 513     /* build table of device driver functions */
 514     _mesa_init_driver_functions(&functions);
 515     swrast_init_driver_functions(&functions);
 516
 517     if (share) {
 518         sharedCtx = &share->Base;
 519     }
 520
 521     mesaCtx = &ctx->Base;
 522
 523     /* basic context setup */
 524     if (!_mesa_initialize_context(mesaCtx, visual, sharedCtx, &functions, (void *) cPriv)) {
 525         goto context_fail;
 526     }
 527
 528     /* do bounds checking to prevent segfaults and server crashes! */
 529     mesaCtx->Const.CheckArrayBounds = GL_TRUE;
 530
 531     /* create module contexts */
 532     _swrast_CreateContext( mesaCtx );
 533     _vbo_CreateContext( mesaCtx );
 534     _tnl_CreateContext( mesaCtx );
 535     _swsetup_CreateContext( mesaCtx );
 536     _swsetup_Wakeup( mesaCtx );
 537
 538     /* use default TCL pipeline */
 539     {
 540        TNLcontext *tnl = TNL_CONTEXT(mesaCtx);
 541        tnl->Driver.RunPipeline = _tnl_run_pipeline;
 542     }
 543
 544     _mesa_enable_sw_extensions(mesaCtx);
 545     _mesa_enable_1_3_extensions(mesaCtx);
 546     _mesa_enable_1_4_extensions(mesaCtx);
 547     _mesa_enable_1_5_extensions(mesaCtx);
 548     _mesa_enable_2_0_extensions(mesaCtx);
 549     _mesa_enable_2_1_extensions(mesaCtx);
 550
 551     _mesa_meta_init(mesaCtx);
 552
 553     driInitExtensions( mesaCtx, NULL, GL_FALSE );
 554
 555     return GL_TRUE;
 556
 557 context_fail:
 558
 559     FREE(ctx);
 560
 561     return GL_FALSE;
 562 }
 563
 564 static void
 565 dri_destroy_context(__DRIcontext * cPriv)
 566 {
 567     TRACE;
 568
 569     if (cPriv) {
 570         struct dri_context *ctx = dri_context(cPriv);
 571         GLcontext *mesaCtx;
 572
 573         mesaCtx = &ctx->Base;
 574
 575         _mesa_meta_free(mesaCtx);
 576         _swsetup_DestroyContext( mesaCtx );
 577         _swrast_DestroyContext( mesaCtx );
 578         _tnl_DestroyContext( mesaCtx );
 579         _vbo_DestroyContext( mesaCtx );
 580         _mesa_destroy_context( mesaCtx );
 581     }
 582 }
 583
 584 static GLboolean
 585 dri_make_current(__DRIcontext * cPriv,
 586                  __DRIdrawable * driDrawPriv,
 587                  __DRIdrawable * driReadPriv)
 588 {
 589     GLcontext *mesaCtx;
 590     GLframebuffer *mesaDraw;
 591     GLframebuffer *mesaRead;
 592     TRACE;
 593
 594     if (cPriv) {
 595         struct dri_context *ctx = dri_context(cPriv);
 596         struct dri_drawable *draw = dri_drawable(driDrawPriv);
 597         struct dri_drawable *read = dri_drawable(driReadPriv);
 598
 599         if (!driDrawPriv || !driReadPriv)
 600             return GL_FALSE;
 601
 602         mesaCtx = &ctx->Base;
 603         mesaDraw = &draw->Base;
 604         mesaRead = &read->Base;
 605
 606         /* check for same context and buffer */
 607         if (mesaCtx == _mesa_get_current_context()
 608             && mesaCtx->DrawBuffer == mesaDraw
 609             && mesaCtx->ReadBuffer == mesaRead) {
 610             return GL_TRUE;
 611         }
 612
 613         _glapi_check_multithread();
 614
 615         swrast_check_and_update_window_size(mesaCtx, mesaDraw);
 616         if (mesaRead != mesaDraw)
 617             swrast_check_and_update_window_size(mesaCtx, mesaRead);
 618
 619         _mesa_make_current( mesaCtx,
 620                             mesaDraw,
 621                             mesaRead );
 622     }
 623     else {
 624         /* unbind */
 625         _mesa_make_current( NULL, NULL, NULL );
 626     }
 627
 628     return GL_TRUE;
 629 }
 630
 631 static GLboolean
 632 dri_unbind_context(__DRIcontext * cPriv)
 633 {
 634     TRACE;
 635     (void) cPriv;
 636     return GL_TRUE;
 637 }
 638
 639
 640 const struct __DriverAPIRec driDriverAPI = {
 641     .InitScreen = dri_init_screen,
 642     .DestroyScreen = dri_destroy_screen,
 643     .CreateContext = dri_create_context,
 644     .DestroyContext = dri_destroy_context,
 645     .CreateBuffer = dri_create_buffer,
 646     .DestroyBuffer = dri_destroy_buffer,
 647     .SwapBuffers = dri_swap_buffers,
 648     .MakeCurrent = dri_make_current,
 649     .UnbindContext = dri_unbind_context,
 650 };
 651
 652 /* This is the table of extensions that the loader will dlsym() for. */
 653 PUBLIC const __DRIextension *__driDriverExtensions[] = {
 654     &driCoreExtension.base,
 655     &driSWRastExtension.base,
 656     NULL
 657 };