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 INLINE int
 210 bytes_per_line(unsigned pitch_bits, unsigned mul)
 211 {
 212    unsigned mask = mul - 1;
 213
 214    return ((pitch_bits + mask) & ~mask) / 8;
 215 }
 216
 217 static GLboolean
 218 swrast_alloc_front_storage(GLcontext *ctx, struct gl_renderbuffer *rb,
 219                            GLenum internalFormat, GLuint width, GLuint height)
 220 {
 221     struct swrast_renderbuffer *xrb = swrast_renderbuffer(rb);
 222
 223     TRACE;
 224
 225     rb->Data = NULL;
 226     rb->Width = width;
 227     rb->Height = height;
 228
 229     xrb->pitch = bytes_per_line(width * xrb->bpp, 32);
 230
 231     return GL_TRUE;
 232 }
 233
 234 static GLboolean
 235 swrast_alloc_back_storage(GLcontext *ctx, struct gl_renderbuffer *rb,
 236                           GLenum internalFormat, GLuint width, GLuint height)
 237 {
 238     struct swrast_renderbuffer *xrb = swrast_renderbuffer(rb);
 239
 240     TRACE;
 241
 242     free(rb->Data);
 243
 244     swrast_alloc_front_storage(ctx, rb, internalFormat, width, height);
 245
 246     rb->Data = malloc(height * xrb->pitch);
 247
 248     return GL_TRUE;
 249 }
 250
 251 static struct swrast_renderbuffer *
 252 swrast_new_renderbuffer(const GLvisual *visual, GLboolean front)
 253 {
 254     struct swrast_renderbuffer *xrb = calloc(1, sizeof *xrb);
 255     GLuint pixel_format;
 256
 257     TRACE;
 258
 259     if (!xrb)
 260         return NULL;
 261
 262     _mesa_init_renderbuffer(&xrb->Base, 0);
 263
 264     pixel_format = choose_pixel_format(visual);
 265
 266     xrb->Base.Delete = swrast_delete_renderbuffer;
 267     if (front) {
 268         xrb->Base.AllocStorage = swrast_alloc_front_storage;
 269         swrast_set_span_funcs_front(xrb, pixel_format);
 270     }
 271     else {
 272         xrb->Base.AllocStorage = swrast_alloc_back_storage;
 273         swrast_set_span_funcs_back(xrb, pixel_format);
 274     }
 275
 276     switch (pixel_format) {
 277     case PF_A8R8G8B8:
 278         xrb->Base.Format = MESA_FORMAT_ARGB8888;
 279         xrb->Base.InternalFormat = GL_RGBA;
 280         xrb->Base._BaseFormat = GL_RGBA;
 281         xrb->Base.DataType = GL_UNSIGNED_BYTE;
 282         xrb->bpp = 32;
 283         break;
 284     case PF_X8R8G8B8:
 285         xrb->Base.Format = MESA_FORMAT_ARGB8888; /* XXX */
 286         xrb->Base.InternalFormat = GL_RGB;
 287         xrb->Base._BaseFormat = GL_RGB;
 288         xrb->Base.DataType = GL_UNSIGNED_BYTE;
 289         xrb->bpp = 32;
 290         break;
 291     case PF_R5G6B5:
 292         xrb->Base.Format = MESA_FORMAT_RGB565;
 293         xrb->Base.InternalFormat = GL_RGB;
 294         xrb->Base._BaseFormat = GL_RGB;
 295         xrb->Base.DataType = GL_UNSIGNED_BYTE;
 296         xrb->bpp = 16;
 297         break;
 298     case PF_R3G3B2:
 299         xrb->Base.Format = MESA_FORMAT_RGB332;
 300         xrb->Base.InternalFormat = GL_RGB;
 301         xrb->Base._BaseFormat = GL_RGB;
 302         xrb->Base.DataType = GL_UNSIGNED_BYTE;
 303         xrb->bpp = 8;
 304         break;
 305     default:
 306         return NULL;
 307     }
 308
 309     return xrb;
 310 }
 311
 312 static GLboolean
 313 dri_create_buffer(__DRIscreen * sPriv,
 314                   __DRIdrawable * dPriv,
 315                   const __GLcontextModes * visual, GLboolean isPixmap)
 316 {
 317     struct dri_drawable *drawable = NULL;
 318     GLframebuffer *fb;
 319     struct swrast_renderbuffer *frontrb, *backrb;
 320
 321     TRACE;
 322
 323     drawable = CALLOC_STRUCT(dri_drawable);
 324     if (drawable == NULL)
 325         goto drawable_fail;
 326
 327     dPriv->driverPrivate = drawable;
 328     drawable->dPriv = dPriv;
 329
 330     drawable->row = malloc(MAX_WIDTH * 4);
 331     if (drawable->row == NULL)
 332         goto drawable_fail;
 333
 334     fb = &drawable->Base;
 335
 336     /* basic framebuffer setup */
 337     _mesa_initialize_window_framebuffer(fb, visual);
 338
 339     /* add front renderbuffer */
 340     frontrb = swrast_new_renderbuffer(visual, GL_TRUE);
 341     _mesa_add_renderbuffer(fb, BUFFER_FRONT_LEFT, &frontrb->Base);
 342
 343     /* add back renderbuffer */
 344     if (visual->doubleBufferMode) {
 345         backrb = swrast_new_renderbuffer(visual, GL_FALSE);
 346         _mesa_add_renderbuffer(fb, BUFFER_BACK_LEFT, &backrb->Base);
 347     }
 348
 349     /* add software renderbuffers */
 350     _mesa_add_soft_renderbuffers(fb,
 351                                  GL_FALSE, /* color */
 352                                  visual->haveDepthBuffer,
 353                                  visual->haveStencilBuffer,
 354                                  visual->haveAccumBuffer,
 355                                  GL_FALSE, /* alpha */
 356                                  GL_FALSE /* aux bufs */);
 357
 358     return GL_TRUE;
 359
 360 drawable_fail:
 361
 362     if (drawable)
 363         free(drawable->row);
 364
 365     FREE(drawable);
 366
 367     return GL_FALSE;
 368 }
 369
 370 static void
 371 dri_destroy_buffer(__DRIdrawable * dPriv)
 372 {
 373     TRACE;
 374
 375     if (dPriv) {
 376         struct dri_drawable *drawable = dri_drawable(dPriv);
 377         GLframebuffer *fb;
 378
 379         free(drawable->row);
 380
 381         fb = &drawable->Base;
 382
 383         fb->DeletePending = GL_TRUE;
 384         _mesa_reference_framebuffer(&fb, NULL);
 385     }
 386 }
 387
 388 static void
 389 dri_swap_buffers(__DRIdrawable * dPriv)
 390 {
 391     __DRIscreen *sPriv = dPriv->driScreenPriv;
 392
 393     GET_CURRENT_CONTEXT(ctx);
 394
 395     struct dri_drawable *drawable = dri_drawable(dPriv);
 396     GLframebuffer *fb;
 397     struct swrast_renderbuffer *frontrb, *backrb;
 398
 399     TRACE;
 400
 401     fb = &drawable->Base;
 402
 403     frontrb =
 404         swrast_renderbuffer(fb->Attachment[BUFFER_FRONT_LEFT].Renderbuffer);
 405     backrb =
 406         swrast_renderbuffer(fb->Attachment[BUFFER_BACK_LEFT].Renderbuffer);
 407
 408     /* check for signle-buffered */
 409     if (backrb == NULL)
 410         return;
 411
 412     /* check if swapping currently bound buffer */
 413     if (ctx && ctx->DrawBuffer == fb) {
 414         /* flush pending rendering */
 415         _mesa_notifySwapBuffers(ctx);
 416     }
 417
 418     sPriv->swrast_loader->putImage(dPriv, __DRI_SWRAST_IMAGE_OP_SWAP,
 419                                    0, 0,
 420                                    frontrb->Base.Width,
 421                                    frontrb->Base.Height,
 422                                    backrb->Base.Data,
 423                                    dPriv->loaderPrivate);
 424 }
 425
 426
 427 /**
 428  * General device driver functions.
 429  */
 430
 431 static void
 432 get_window_size( GLframebuffer *fb, GLsizei *w, GLsizei *h )
 433 {
 434     __DRIdrawable *dPriv = swrast_drawable(fb)->dPriv;
 435     __DRIscreen *sPriv = dPriv->driScreenPriv;
 436     int x, y;
 437
 438     sPriv->swrast_loader->getDrawableInfo(dPriv,
 439                                           &x, &y, w, h,
 440                                           dPriv->loaderPrivate);
 441 }
 442
 443 static void
 444 swrast_check_and_update_window_size( GLcontext *ctx, GLframebuffer *fb )
 445 {
 446     GLsizei width, height;
 447
 448     get_window_size(fb, &width, &height);
 449     if (fb->Width != width || fb->Height != height) {
 450         _mesa_resize_framebuffer(ctx, fb, width, height);
 451     }
 452 }
 453
 454 static const GLubyte *
 455 get_string(GLcontext *ctx, GLenum pname)
 456 {
 457     (void) ctx;
 458     switch (pname) {
 459         case GL_VENDOR:
 460             return (const GLubyte *) "Mesa Project";
 461         case GL_RENDERER:
 462             return (const GLubyte *) "Software Rasterizer";
 463         default:
 464             return NULL;
 465     }
 466 }
 467
 468 static void
 469 update_state( GLcontext *ctx, GLuint new_state )
 470 {
 471     /* not much to do here - pass it on */
 472     _swrast_InvalidateState( ctx, new_state );
 473     _swsetup_InvalidateState( ctx, new_state );
 474     _vbo_InvalidateState( ctx, new_state );
 475     _tnl_InvalidateState( ctx, new_state );
 476 }
 477
 478 static void
 479 viewport(GLcontext *ctx, GLint x, GLint y, GLsizei w, GLsizei h)
 480 {
 481     GLframebuffer *draw = ctx->WinSysDrawBuffer;
 482     GLframebuffer *read = ctx->WinSysReadBuffer;
 483
 484     swrast_check_and_update_window_size(ctx, draw);
 485     swrast_check_and_update_window_size(ctx, read);
 486 }
 487
 488 static void
 489 swrast_init_driver_functions(struct dd_function_table *driver)
 490 {
 491     driver->GetString = get_string;
 492     driver->UpdateState = update_state;
 493     driver->GetBufferSize = NULL;
 494     driver->Viewport = viewport;
 495 }
 496
 497
 498 /**
 499  * Context-related functions.
 500  */
 501
 502 static GLboolean
 503 dri_create_context(const __GLcontextModes * visual,
 504                    __DRIcontext * cPriv, void *sharedContextPrivate)
 505 {
 506     struct dri_context *ctx = NULL;
 507     struct dri_context *share = (struct dri_context *)sharedContextPrivate;
 508     GLcontext *mesaCtx = NULL;
 509     GLcontext *sharedCtx = NULL;
 510     struct dd_function_table functions;
 511
 512     TRACE;
 513
 514     ctx = CALLOC_STRUCT(dri_context);
 515     if (ctx == NULL)
 516         goto context_fail;
 517
 518     cPriv->driverPrivate = ctx;
 519     ctx->cPriv = cPriv;
 520
 521     /* build table of device driver functions */
 522     _mesa_init_driver_functions(&functions);
 523     swrast_init_driver_functions(&functions);
 524
 525     if (share) {
 526         sharedCtx = &share->Base;
 527     }
 528
 529     mesaCtx = &ctx->Base;
 530
 531     /* basic context setup */
 532     if (!_mesa_initialize_context(mesaCtx, visual, sharedCtx, &functions, (void *) cPriv)) {
 533         goto context_fail;
 534     }
 535
 536     /* do bounds checking to prevent segfaults and server crashes! */
 537     mesaCtx->Const.CheckArrayBounds = GL_TRUE;
 538
 539     /* create module contexts */
 540     _swrast_CreateContext( mesaCtx );
 541     _vbo_CreateContext( mesaCtx );
 542     _tnl_CreateContext( mesaCtx );
 543     _swsetup_CreateContext( mesaCtx );
 544     _swsetup_Wakeup( mesaCtx );
 545
 546     /* use default TCL pipeline */
 547     {
 548        TNLcontext *tnl = TNL_CONTEXT(mesaCtx);
 549        tnl->Driver.RunPipeline = _tnl_run_pipeline;
 550     }
 551
 552     _mesa_enable_sw_extensions(mesaCtx);
 553     _mesa_enable_1_3_extensions(mesaCtx);
 554     _mesa_enable_1_4_extensions(mesaCtx);
 555     _mesa_enable_1_5_extensions(mesaCtx);
 556     _mesa_enable_2_0_extensions(mesaCtx);
 557     _mesa_enable_2_1_extensions(mesaCtx);
 558
 559     _mesa_meta_init(mesaCtx);
 560
 561     driInitExtensions( mesaCtx, NULL, GL_FALSE );
 562
 563     return GL_TRUE;
 564
 565 context_fail:
 566
 567     FREE(ctx);
 568
 569     return GL_FALSE;
 570 }
 571
 572 static void
 573 dri_destroy_context(__DRIcontext * cPriv)
 574 {
 575     TRACE;
 576
 577     if (cPriv) {
 578         struct dri_context *ctx = dri_context(cPriv);
 579         GLcontext *mesaCtx;
 580
 581         mesaCtx = &ctx->Base;
 582
 583         _mesa_meta_free(mesaCtx);
 584         _swsetup_DestroyContext( mesaCtx );
 585         _swrast_DestroyContext( mesaCtx );
 586         _tnl_DestroyContext( mesaCtx );
 587         _vbo_DestroyContext( mesaCtx );
 588         _mesa_destroy_context( mesaCtx );
 589     }
 590 }
 591
 592 static GLboolean
 593 dri_make_current(__DRIcontext * cPriv,
 594                  __DRIdrawable * driDrawPriv,
 595                  __DRIdrawable * driReadPriv)
 596 {
 597     GLcontext *mesaCtx;
 598     GLframebuffer *mesaDraw;
 599     GLframebuffer *mesaRead;
 600     TRACE;
 601
 602     if (cPriv) {
 603         struct dri_context *ctx = dri_context(cPriv);
 604         struct dri_drawable *draw = dri_drawable(driDrawPriv);
 605         struct dri_drawable *read = dri_drawable(driReadPriv);
 606
 607         if (!driDrawPriv || !driReadPriv)
 608             return GL_FALSE;
 609
 610         mesaCtx = &ctx->Base;
 611         mesaDraw = &draw->Base;
 612         mesaRead = &read->Base;
 613
 614         /* check for same context and buffer */
 615         if (mesaCtx == _mesa_get_current_context()
 616             && mesaCtx->DrawBuffer == mesaDraw
 617             && mesaCtx->ReadBuffer == mesaRead) {
 618             return GL_TRUE;
 619         }
 620
 621         _glapi_check_multithread();
 622
 623         swrast_check_and_update_window_size(mesaCtx, mesaDraw);
 624         if (mesaRead != mesaDraw)
 625             swrast_check_and_update_window_size(mesaCtx, mesaRead);
 626
 627         _mesa_make_current( mesaCtx,
 628                             mesaDraw,
 629                             mesaRead );
 630     }
 631     else {
 632         /* unbind */
 633         _mesa_make_current( NULL, NULL, NULL );
 634     }
 635
 636     return GL_TRUE;
 637 }
 638
 639 static GLboolean
 640 dri_unbind_context(__DRIcontext * cPriv)
 641 {
 642     TRACE;
 643     (void) cPriv;
 644     return GL_TRUE;
 645 }
 646
 647
 648 const struct __DriverAPIRec driDriverAPI = {
 649     .InitScreen = dri_init_screen,
 650     .DestroyScreen = dri_destroy_screen,
 651     .CreateContext = dri_create_context,
 652     .DestroyContext = dri_destroy_context,
 653     .CreateBuffer = dri_create_buffer,
 654     .DestroyBuffer = dri_destroy_buffer,
 655     .SwapBuffers = dri_swap_buffers,
 656     .MakeCurrent = dri_make_current,
 657     .UnbindContext = dri_unbind_context,
 658 };
 659
 660 /* This is the table of extensions that the loader will dlsym() for. */
 661 PUBLIC const __DRIextension *__driDriverExtensions[] = {
 662     &driCoreExtension.base,
 663     &driSWRastExtension.base,
 664     NULL
 665 };