src/mesa/drivers/dri/swrast/swrast.c

   1 /*
   2  * Copyright (C) 2008 George Sapountzis <gsap7@yahoo.gr>
   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     GLframebuffer *fb;
 312     struct swrast_renderbuffer *frontrb, *backrb;
 313
 314     TRACE;
 315
 316     fb = &dPriv->Base;
 317
 318     dPriv->row = malloc(MAX_WIDTH * 4);
 319
 320     /* basic framebuffer setup */
 321     _mesa_initialize_window_framebuffer(fb, visual);
 322
 323     /* add front renderbuffer */
 324     frontrb = swrast_new_renderbuffer(visual, GL_TRUE);
 325     _mesa_add_renderbuffer(fb, BUFFER_FRONT_LEFT, &frontrb->Base);
 326
 327     /* add back renderbuffer */
 328     if (visual->doubleBufferMode) {
 329         backrb = swrast_new_renderbuffer(visual, GL_FALSE);
 330         _mesa_add_renderbuffer(fb, BUFFER_BACK_LEFT, &backrb->Base);
 331     }
 332
 333     /* add software renderbuffers */
 334     _mesa_add_soft_renderbuffers(fb,
 335                                  GL_FALSE, /* color */
 336                                  visual->haveDepthBuffer,
 337                                  visual->haveStencilBuffer,
 338                                  visual->haveAccumBuffer,
 339                                  GL_FALSE, /* alpha */
 340                                  GL_FALSE /* aux bufs */);
 341
 342     return GL_TRUE;
 343 }
 344
 345 static void
 346 dri_destroy_buffer(__DRIdrawable * dPriv)
 347 {
 348     TRACE;
 349
 350     if (dPriv) {
 351         GLframebuffer *fb;
 352
 353         free(dPriv->row);
 354
 355         fb = &dPriv->Base;
 356
 357         fb->DeletePending = GL_TRUE;
 358         _mesa_reference_framebuffer(&fb, NULL);
 359     }
 360 }
 361
 362 static void
 363 dri_swap_buffers(__DRIdrawable * dPriv)
 364 {
 365     __DRIscreen *sPriv = dPriv->driScreenPriv;
 366
 367     GET_CURRENT_CONTEXT(ctx);
 368
 369     GLframebuffer *fb;
 370     struct swrast_renderbuffer *frontrb, *backrb;
 371
 372     TRACE;
 373
 374     fb = &dPriv->Base;
 375
 376     frontrb = swrast_renderbuffer(fb->Attachment[BUFFER_FRONT_LEFT].Renderbuffer);
 377     backrb = swrast_renderbuffer(fb->Attachment[BUFFER_BACK_LEFT].Renderbuffer);
 378
 379     /* check for signle-buffered */
 380     if (backrb == NULL)
 381         return;
 382
 383     /* check if swapping currently bound buffer */
 384     if (ctx && ctx->DrawBuffer == fb) {
 385         /* flush pending rendering */
 386         _mesa_notifySwapBuffers(ctx);
 387     }
 388
 389     sPriv->swrast_loader->putImage(dPriv, __DRI_SWRAST_IMAGE_OP_SWAP,
 390                                    0, 0,
 391                                    frontrb->Base.Width,
 392                                    frontrb->Base.Height,
 393                                    backrb->Base.Data,
 394                                    dPriv->loaderPrivate);
 395 }
 396
 397
 398 /**
 399  * General device driver functions.
 400  */
 401
 402 static void
 403 get_window_size( GLframebuffer *fb, GLsizei *w, GLsizei *h )
 404 {
 405     __DRIdrawable *dPriv = swrast_drawable(fb);
 406     __DRIscreen *sPriv = dPriv->driScreenPriv;
 407     int x, y;
 408
 409     sPriv->swrast_loader->getDrawableInfo(dPriv,
 410                                           &x, &y, w, h,
 411                                           dPriv->loaderPrivate);
 412 }
 413
 414 static void
 415 swrast_check_and_update_window_size( GLcontext *ctx, GLframebuffer *fb )
 416 {
 417     GLsizei width, height;
 418
 419     get_window_size(fb, &width, &height);
 420     if (fb->Width != width || fb->Height != height) {
 421         _mesa_resize_framebuffer(ctx, fb, width, height);
 422     }
 423 }
 424
 425 static const GLubyte *
 426 get_string(GLcontext *ctx, GLenum pname)
 427 {
 428     (void) ctx;
 429     switch (pname) {
 430         case GL_VENDOR:
 431             return (const GLubyte *) "Mesa Project";
 432         case GL_RENDERER:
 433             return (const GLubyte *) "Software Rasterizer";
 434         default:
 435             return NULL;
 436     }
 437 }
 438
 439 static void
 440 update_state( GLcontext *ctx, GLuint new_state )
 441 {
 442     /* not much to do here - pass it on */
 443     _swrast_InvalidateState( ctx, new_state );
 444     _swsetup_InvalidateState( ctx, new_state );
 445     _vbo_InvalidateState( ctx, new_state );
 446     _tnl_InvalidateState( ctx, new_state );
 447 }
 448
 449 static void
 450 viewport(GLcontext *ctx, GLint x, GLint y, GLsizei w, GLsizei h)
 451 {
 452     GLframebuffer *draw = ctx->WinSysDrawBuffer;
 453     GLframebuffer *read = ctx->WinSysReadBuffer;
 454
 455     swrast_check_and_update_window_size(ctx, draw);
 456     swrast_check_and_update_window_size(ctx, read);
 457 }
 458
 459 static void
 460 swrast_init_driver_functions(struct dd_function_table *driver)
 461 {
 462     driver->GetString = get_string;
 463     driver->UpdateState = update_state;
 464     driver->GetBufferSize = NULL;
 465     driver->Viewport = viewport;
 466 }
 467
 468
 469 /**
 470  * Context-related functions.
 471  */
 472
 473 static GLboolean
 474 dri_create_context(const __GLcontextModes * visual,
 475                    __DRIcontext * cPriv, void *sharedContextPrivate)
 476 {
 477     GLcontext *mesaCtx;
 478     GLcontext *sharedCtx;
 479     struct dd_function_table functions;
 480
 481     TRACE;
 482
 483     /* build table of device driver functions */
 484     _mesa_init_driver_functions(&functions);
 485     swrast_init_driver_functions(&functions);
 486
 487     sharedCtx = sharedContextPrivate;
 488
 489     /* basic context setup */
 490     if (!_mesa_initialize_context(&cPriv->Base, visual, sharedCtx, &functions, (void *) cPriv)) {
 491       return GL_FALSE;
 492     }
 493
 494     mesaCtx = &cPriv->Base;
 495
 496     /* do bounds checking to prevent segfaults and server crashes! */
 497     mesaCtx->Const.CheckArrayBounds = GL_TRUE;
 498
 499     /* create module contexts */
 500     _swrast_CreateContext( mesaCtx );
 501     _vbo_CreateContext( mesaCtx );
 502     _tnl_CreateContext( mesaCtx );
 503     _swsetup_CreateContext( mesaCtx );
 504     _swsetup_Wakeup( mesaCtx );
 505
 506     /* use default TCL pipeline */
 507     {
 508        TNLcontext *tnl = TNL_CONTEXT(mesaCtx);
 509        tnl->Driver.RunPipeline = _tnl_run_pipeline;
 510     }
 511
 512     _mesa_enable_sw_extensions(mesaCtx);
 513     _mesa_enable_1_3_extensions(mesaCtx);
 514     _mesa_enable_1_4_extensions(mesaCtx);
 515     _mesa_enable_1_5_extensions(mesaCtx);
 516     _mesa_enable_2_0_extensions(mesaCtx);
 517     _mesa_enable_2_1_extensions(mesaCtx);
 518
 519     _mesa_meta_init(mesaCtx);
 520
 521     driInitExtensions( mesaCtx, NULL, GL_FALSE );
 522
 523     return GL_TRUE;
 524 }
 525
 526 static void
 527 dri_destroy_context(__DRIcontext * cPriv)
 528 {
 529     GLcontext *mesaCtx;
 530     TRACE;
 531
 532     if (cPriv) {
 533         mesaCtx = &cPriv->Base;
 534
 535         _mesa_meta_free(mesaCtx);
 536         _swsetup_DestroyContext( mesaCtx );
 537         _swrast_DestroyContext( mesaCtx );
 538         _tnl_DestroyContext( mesaCtx );
 539         _vbo_DestroyContext( mesaCtx );
 540         _mesa_destroy_context( mesaCtx );
 541     }
 542 }
 543
 544 static GLboolean
 545 dri_make_current(__DRIcontext * cPriv,
 546                  __DRIdrawable * driDrawPriv,
 547                  __DRIdrawable * driReadPriv)
 548 {
 549     GLcontext *mesaCtx;
 550     GLframebuffer *mesaDraw;
 551     GLframebuffer *mesaRead;
 552     TRACE;
 553
 554     if (cPriv) {
 555         if (!driDrawPriv || !driReadPriv)
 556             return GL_FALSE;
 557
 558         mesaCtx = &cPriv->Base;
 559         mesaDraw = &driDrawPriv->Base;
 560         mesaRead = &driReadPriv->Base;
 561
 562         /* check for same context and buffer */
 563         if (mesaCtx == _mesa_get_current_context()
 564             && mesaCtx->DrawBuffer == mesaDraw
 565             && mesaCtx->ReadBuffer == mesaRead) {
 566             return GL_TRUE;
 567         }
 568
 569         _glapi_check_multithread();
 570
 571         swrast_check_and_update_window_size(mesaCtx, mesaDraw);
 572         if (mesaRead != mesaDraw)
 573             swrast_check_and_update_window_size(mesaCtx, mesaRead);
 574
 575         _mesa_make_current( mesaCtx,
 576                             mesaDraw,
 577                             mesaRead );
 578     }
 579     else {
 580         /* unbind */
 581         _mesa_make_current( NULL, NULL, NULL );
 582     }
 583
 584     return GL_TRUE;
 585 }
 586
 587 static GLboolean
 588 dri_unbind_context(__DRIcontext * cPriv)
 589 {
 590     TRACE;
 591     (void) cPriv;
 592     return GL_TRUE;
 593 }
 594
 595
 596 const struct __DriverAPIRec driDriverAPI = {
 597     .InitScreen = dri_init_screen,
 598     .DestroyScreen = dri_destroy_screen,
 599     .CreateContext = dri_create_context,
 600     .DestroyContext = dri_destroy_context,
 601     .CreateBuffer = dri_create_buffer,
 602     .DestroyBuffer = dri_destroy_buffer,
 603     .SwapBuffers = dri_swap_buffers,
 604     .MakeCurrent = dri_make_current,
 605     .UnbindContext = dri_unbind_context,
 606 };
 607
 608 /* This is the table of extensions that the loader will dlsym() for. */
 609 PUBLIC const __DRIextension *__driDriverExtensions[] = {
 610     &driCoreExtension.base,
 611     &driSWRastExtension.base,
 612     NULL
 613 };