src/mesa/drivers/dri/unichrome/via_context.c

   1 /*
   2  * Copyright 1998-2003 VIA Technologies, Inc. All Rights Reserved.
   3  * Copyright 2001-2003 S3 Graphics, Inc. All Rights Reserved.
   4  *
   5  * Permission is hereby granted, free of charge, to any person obtaining a
   6  * copy of this software and associated documentation files (the "Software"),
   7  * to deal in the Software without restriction, including without limitation
   8  * the rights to use, copy, modify, merge, publish, distribute, sub license,
   9  * and/or sell copies of the Software, and to permit persons to whom the
  10  * Software is furnished to do so, subject to the following conditions:
  11  *
  12  * The above copyright notice and this permission notice (including the
  13  * next paragraph) shall be included in all copies or substantial portions
  14  * of the Software.
  15  *
  16  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  17  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  18  * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
  19  * VIA, S3 GRAPHICS, AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
  20  * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
  21  * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
  22  * DEALINGS IN THE SOFTWARE.
  23  */
  24
  25 /**
  26  * \file via_context.c
  27  *
  28  * \author John Sheng (presumably of either VIA Technologies or S3 Graphics)
  29  * \author Others at VIA Technologies?
  30  * \author Others at S3 Graphics?
  31  */
  32
  33 #include "glheader.h"
  34 #include "context.h"
  35 #include "matrix.h"
  36 #include "state.h"
  37 #include "simple_list.h"
  38 #include "extensions.h"
  39
  40 #include "swrast/swrast.h"
  41 #include "swrast_setup/swrast_setup.h"
  42 #include "tnl/tnl.h"
  43 #include "array_cache/acache.h"
  44
  45 #include "tnl/t_pipeline.h"
  46
  47 #include "drivers/common/driverfuncs.h"
  48
  49 #include "via_screen.h"
  50 #include "via_dri.h"
  51
  52 #include "via_state.h"
  53 #include "via_tex.h"
  54 #include "via_span.h"
  55 #include "via_tris.h"
  56 #include "via_ioctl.h"
  57 #include "via_fb.h"
  58
  59 #include <stdio.h>
  60 #include "macros.h"
  61
  62 #define DRIVER_DATE     "20041215"
  63
  64 #include "vblank.h"
  65 #include "utils.h"
  66
  67 #ifdef DEBUG
  68 GLuint VIA_DEBUG = 0;
  69 #endif
  70
  71
  72 /**
  73  * Return various strings for \c glGetString.
  74  *
  75  * \sa glGetString
  76  */
  77 static const GLubyte *viaGetString(GLcontext *ctx, GLenum name)
  78 {
  79    static char buffer[128];
  80    unsigned   offset;
  81
  82
  83    switch (name) {
  84    case GL_VENDOR:
  85       return (GLubyte *)"VIA Technology";
  86
  87    case GL_RENDERER: {
  88       static const char * const chipset_names[] = {
  89          "UniChrome",
  90          "CastleRock (CLE266)",
  91          "UniChrome (KM400)",
  92          "UniChrome (K8M800)",
  93          "UniChrome (PM8x0/CN400)",
  94       };
  95       const viaContext * const via = VIA_CONTEXT(ctx);
  96       const unsigned id = via->viaScreen->deviceID;
  97
  98       offset = driGetRendererString( buffer,
  99                                      chipset_names[(id > VIA_PM800) ? 0 : id],
 100                                      DRIVER_DATE, 0 );
 101       return (GLubyte *)buffer;
 102    }
 103
 104    default:
 105       return NULL;
 106    }
 107 }
 108
 109
 110 /**
 111  * Calculate a width that satisfies the hardware's alignment requirements.
 112  * On the Unichrome hardware, each scanline must be aligned to a multiple of
 113  * 16 pixels.
 114  *
 115  * \param width  Minimum buffer width, in pixels.
 116  *
 117  * \returns A pixel width that meets the alignment requirements.
 118  */
 119 static __inline__ unsigned
 120 buffer_align( unsigned width )
 121 {
 122     return (width + 0x0f) & ~0x0f;
 123 }
 124
 125
 126 /**
 127  * Calculate the framebuffer parameters for all buffers (front, back, depth,
 128  * and stencil) associated with the specified context.
 129  *
 130  * \warning
 131  * This function also calls \c AllocateBuffer to actually allocate the
 132  * buffers.
 133  *
 134  * \sa AllocateBuffer
 135  */
 136 static GLboolean
 137 calculate_buffer_parameters( viaContextPtr vmesa )
 138 {
 139    const unsigned shift = vmesa->viaScreen->bitsPerPixel / 16;
 140    const unsigned extra = 32;
 141    unsigned w;
 142    unsigned h;
 143
 144    /* Allocate front-buffer */
 145    if (vmesa->drawType == GLX_PBUFFER_BIT) {
 146       w = vmesa->driDrawable->w;
 147       h = vmesa->driDrawable->h;
 148
 149       vmesa->front.bpp = vmesa->viaScreen->bitsPerPixel;
 150       vmesa->front.pitch = buffer_align( w ) << shift;
 151       vmesa->front.size = vmesa->front.pitch * h;
 152
 153       if (vmesa->front.map)
 154          via_free_draw_buffer(vmesa, &vmesa->front);
 155       if (!via_alloc_draw_buffer(vmesa, &vmesa->front))
 156          return GL_FALSE;
 157
 158    }
 159    else {
 160       w = vmesa->viaScreen->width;
 161       h = vmesa->viaScreen->height;
 162
 163       vmesa->front.bpp = vmesa->viaScreen->bitsPerPixel;
 164       vmesa->front.pitch = buffer_align( w ) << shift;
 165       vmesa->front.size = vmesa->front.pitch * h;
 166       vmesa->front.offset = 0;
 167       vmesa->front.map = (char *) vmesa->driScreen->pFB;
 168    }
 169
 170
 171    /* Allocate back-buffer */
 172    if (vmesa->hasBack) {
 173       vmesa->back.bpp = vmesa->viaScreen->bitsPerPixel;
 174       vmesa->back.pitch = (buffer_align( vmesa->driDrawable->w ) << shift) + extra;
 175       vmesa->back.size = vmesa->back.pitch * vmesa->driDrawable->h;
 176       if (vmesa->back.map)
 177          via_free_draw_buffer(vmesa, &vmesa->back);
 178       if (!via_alloc_draw_buffer(vmesa, &vmesa->back))
 179          return GL_FALSE;
 180    }
 181    else {
 182       if (vmesa->back.map)
 183          via_free_draw_buffer(vmesa, &vmesa->back);
 184       (void) memset( &vmesa->back, 0, sizeof( vmesa->back ) );
 185    }
 186
 187
 188    /* Allocate depth-buffer */
 189    if ( vmesa->hasStencil || vmesa->hasDepth ) {
 190       vmesa->depth.bpp = vmesa->depthBits;
 191       if (vmesa->depth.bpp == 24)
 192          vmesa->depth.bpp = 32;
 193
 194       vmesa->depth.pitch = (buffer_align( vmesa->driDrawable->w ) * (vmesa->depth.bpp/8)) + extra;
 195       vmesa->depth.size = vmesa->depth.pitch * vmesa->driDrawable->h;
 196
 197       if (vmesa->depth.map)
 198          via_free_draw_buffer(vmesa, &vmesa->depth);
 199       if (!via_alloc_draw_buffer(vmesa, &vmesa->depth)) {
 200          return GL_FALSE;
 201       }
 202    }
 203    else {
 204       if (vmesa->depth.map)
 205          via_free_draw_buffer(vmesa, &vmesa->depth);
 206       (void) memset( & vmesa->depth, 0, sizeof( vmesa->depth ) );
 207    }
 208
 209    /*=* John Sheng [2003.5.31] flip *=*/
 210    if( vmesa->viaScreen->width == vmesa->driDrawable->w &&
 211        vmesa->viaScreen->height == vmesa->driDrawable->h ) {
 212 #define ALLOW_EXPERIMENTAL_PAGEFLIP 0
 213 #if ALLOW_EXPERIMENTAL_PAGEFLIP
 214       vmesa->doPageFlip = GL_TRUE;
 215       /* vmesa->currentPage = 0; */
 216       assert(vmesa->back.pitch == vmesa->front.pitch);
 217 #else
 218       vmesa->doPageFlip = GL_FALSE;
 219 #endif
 220    }
 221    else
 222       vmesa->doPageFlip = GL_FALSE;
 223
 224    return GL_TRUE;
 225 }
 226
 227
 228 void viaReAllocateBuffers(GLframebuffer *drawbuffer)
 229 {
 230     GET_CURRENT_CONTEXT(ctx);
 231     viaContextPtr vmesa = VIA_CONTEXT(ctx);
 232
 233     _swrast_alloc_buffers( drawbuffer );
 234     calculate_buffer_parameters( vmesa );
 235 }
 236
 237 static void viaBufferSize(GLframebuffer *buffer, GLuint *width, GLuint *height)
 238 {
 239     GET_CURRENT_CONTEXT(ctx);
 240     viaContextPtr vmesa = VIA_CONTEXT(ctx);
 241     *width = vmesa->driDrawable->w;
 242     *height = vmesa->driDrawable->h;
 243 }
 244
 245 /* Extension strings exported by the Unichrome driver.
 246  */
 247 static const char * const card_extensions[] =
 248 {
 249    "GL_ARB_multitexture",
 250    "GL_ARB_point_parameters",
 251    "GL_ARB_texture_env_add",
 252    "GL_ARB_texture_env_combine",
 253    "GL_ARB_texture_env_dot3",
 254    "GL_ARB_texture_mirrored_repeat",
 255    "GL_EXT_stencil_wrap",
 256    "GL_EXT_texture_env_combine",
 257    "GL_EXT_texture_env_dot3",
 258    "GL_EXT_texture_lod_bias",
 259    "GL_EXT_secondary_color",
 260    "GL_EXT_fog_coord",
 261    "GL_NV_blend_square",
 262    NULL
 263 };
 264
 265 extern const struct tnl_pipeline_stage _via_fastrender_stage;
 266 extern const struct tnl_pipeline_stage _via_render_stage;
 267
 268 static const struct tnl_pipeline_stage *via_pipeline[] = {
 269     &_tnl_vertex_transform_stage,
 270     &_tnl_normal_transform_stage,
 271     &_tnl_lighting_stage,
 272     &_tnl_fog_coordinate_stage,
 273     &_tnl_texgen_stage,
 274     &_tnl_texture_transform_stage,
 275     /* REMOVE: point attenuation stage */
 276     &_via_fastrender_stage,     /* ADD: unclipped rastersetup-to-dma */
 277     &_tnl_render_stage,
 278     0,
 279 };
 280
 281
 282 static GLboolean
 283 AllocateDmaBuffer(const GLvisual *visual, viaContextPtr vmesa)
 284 {
 285     if (vmesa->dma)
 286         via_free_dma_buffer(vmesa);
 287
 288     if (!via_alloc_dma_buffer(vmesa))
 289         return GL_FALSE;
 290
 291     vmesa->dmaLow = 0;
 292     vmesa->dmaCliprectAddr = ~0;
 293     return GL_TRUE;
 294 }
 295
 296 static void
 297 FreeBuffer(viaContextPtr vmesa)
 298 {
 299     if (vmesa->front.map && vmesa->drawType == GLX_PBUFFER_BIT)
 300         via_free_draw_buffer(vmesa, &vmesa->front);
 301
 302     if (vmesa->back.map)
 303         via_free_draw_buffer(vmesa, &vmesa->back);
 304
 305     if (vmesa->depth.map)
 306         via_free_draw_buffer(vmesa, &vmesa->depth);
 307
 308     if (vmesa->dma)
 309         via_free_dma_buffer(vmesa);
 310 }
 311
 312 static int
 313 get_ust_nop( int64_t * ust )
 314 {
 315    *ust = 1;
 316    return 0;
 317 }
 318
 319 GLboolean
 320 viaCreateContext(const __GLcontextModes *mesaVis,
 321                  __DRIcontextPrivate *driContextPriv,
 322                  void *sharedContextPrivate)
 323 {
 324     GLcontext *ctx, *shareCtx;
 325     viaContextPtr vmesa;
 326     __DRIscreenPrivate *sPriv = driContextPriv->driScreenPriv;
 327     viaScreenPrivate *viaScreen = (viaScreenPrivate *)sPriv->private;
 328     drm_via_sarea_t *saPriv = (drm_via_sarea_t *)
 329         (((GLubyte *)sPriv->pSAREA) + viaScreen->sareaPrivOffset);
 330     struct dd_function_table functions;
 331
 332     /* Allocate via context */
 333     vmesa = (viaContextPtr) CALLOC_STRUCT(via_context_t);
 334     if (!vmesa) {
 335         return GL_FALSE;
 336     }
 337     if (VIA_DEBUG) fprintf(stderr, "%s - in\n", __FUNCTION__);
 338
 339     /* Parse configuration files.
 340      */
 341     driParseConfigFiles (&vmesa->optionCache, &viaScreen->optionCache,
 342                          sPriv->myNum, "via");
 343
 344     /* pick back buffer */
 345     vmesa->hasBack = mesaVis->doubleBufferMode;
 346
 347     switch(mesaVis->depthBits) {
 348     case 0:
 349        vmesa->hasDepth = GL_FALSE;
 350        vmesa->depthBits = 0;
 351        vmesa->depth_max = 1.0;
 352        break;
 353     case 16:
 354        vmesa->hasDepth = GL_TRUE;
 355        vmesa->depthBits = mesaVis->depthBits;
 356        vmesa->have_hw_stencil = GL_FALSE;
 357        vmesa->depth_max = (GLfloat)0xffff;
 358        vmesa->depth_clear_mask = 0xf << 28;
 359        vmesa->ClearDepth = 0xffff;
 360        vmesa->polygon_offset_scale = 1.0 / vmesa->depth_max;
 361        break;
 362     case 24:
 363        vmesa->hasDepth = GL_TRUE;
 364        vmesa->depthBits = mesaVis->depthBits;
 365        vmesa->depth_max = (GLfloat) 0xffffff;
 366        vmesa->depth_clear_mask = 0xe << 28;
 367        vmesa->ClearDepth = 0xffffff00;
 368
 369        assert(mesaVis->haveStencilBuffer);
 370        assert(mesaVis->stencilBits == 8);
 371
 372        vmesa->have_hw_stencil = GL_TRUE;
 373        vmesa->stencilBits = mesaVis->stencilBits;
 374        vmesa->stencil_clear_mask = 0x1 << 28;
 375        vmesa->polygon_offset_scale = 2.0 / vmesa->depth_max;
 376        break;
 377     case 32:
 378        vmesa->hasDepth = GL_TRUE;
 379        vmesa->depthBits = mesaVis->depthBits;
 380        assert(!mesaVis->haveStencilBuffer);
 381        vmesa->have_hw_stencil = GL_FALSE;
 382        vmesa->depth_max = (GLfloat)0xffffffff;
 383        vmesa->depth_clear_mask = 0xf << 28;
 384        vmesa->ClearDepth = 0xffffffff;
 385        vmesa->polygon_offset_scale = 2.0 / vmesa->depth_max;
 386        break;
 387     default:
 388        assert(0);
 389        break;
 390     }
 391
 392
 393     _mesa_init_driver_functions(&functions);
 394     viaInitTextureFuncs(&functions);
 395
 396     /* Allocate the Mesa context */
 397     if (sharedContextPrivate)
 398         shareCtx = ((viaContextPtr) sharedContextPrivate)->glCtx;
 399     else
 400         shareCtx = NULL;
 401
 402     vmesa->glCtx = _mesa_create_context(mesaVis, shareCtx, &functions, (void*) vmesa);
 403
 404     vmesa->shareCtx = shareCtx;
 405
 406     if (!vmesa->glCtx) {
 407         FREE(vmesa);
 408         return GL_FALSE;
 409     }
 410     driContextPriv->driverPrivate = vmesa;
 411
 412     ctx = vmesa->glCtx;
 413
 414     ctx->Const.MaxTextureLevels = 10;
 415     ctx->Const.MaxTextureUnits = 2;
 416     ctx->Const.MaxTextureImageUnits = ctx->Const.MaxTextureUnits;
 417     ctx->Const.MaxTextureCoordUnits = ctx->Const.MaxTextureUnits;
 418
 419     ctx->Const.MinLineWidth = 1.0;
 420     ctx->Const.MinLineWidthAA = 1.0;
 421     ctx->Const.MaxLineWidth = 1.0;
 422     ctx->Const.MaxLineWidthAA = 1.0;
 423     ctx->Const.LineWidthGranularity = 1.0;
 424
 425     ctx->Const.MinPointSize = 1.0;
 426     ctx->Const.MinPointSizeAA = 1.0;
 427     ctx->Const.MaxPointSize = 1.0;
 428     ctx->Const.MaxPointSizeAA = 1.0;
 429     ctx->Const.PointSizeGranularity = 1.0;
 430
 431     ctx->Driver.GetBufferSize = viaBufferSize;
 432 /*    ctx->Driver.ResizeBuffers = _swrast_alloc_buffers;  *//* FIXME ?? */
 433     ctx->Driver.GetString = viaGetString;
 434
 435     ctx->DriverCtx = (void *)vmesa;
 436     vmesa->glCtx = ctx;
 437
 438     /* Initialize the software rasterizer and helper modules.
 439      */
 440     _swrast_CreateContext(ctx);
 441     _ac_CreateContext(ctx);
 442     _tnl_CreateContext(ctx);
 443     _swsetup_CreateContext(ctx);
 444
 445     /* Install the customized pipeline:
 446      */
 447     _tnl_destroy_pipeline(ctx);
 448     _tnl_install_pipeline(ctx, via_pipeline);
 449
 450     /* Configure swrast and T&L to match hardware characteristics:
 451      */
 452     _swrast_allow_pixel_fog(ctx, GL_FALSE);
 453     _swrast_allow_vertex_fog(ctx, GL_TRUE);
 454     _tnl_allow_pixel_fog(ctx, GL_FALSE);
 455     _tnl_allow_vertex_fog(ctx, GL_TRUE);
 456
 457 /*     vmesa->display = dpy; */
 458     vmesa->display = sPriv->display;
 459
 460     vmesa->hHWContext = driContextPriv->hHWContext;
 461     vmesa->driFd = sPriv->fd;
 462     vmesa->driHwLock = &sPriv->pSAREA->lock;
 463
 464     vmesa->viaScreen = viaScreen;
 465     vmesa->driScreen = sPriv;
 466     vmesa->sarea = saPriv;
 467     vmesa->glBuffer = NULL;
 468
 469     vmesa->texHeap = mmInit(0, viaScreen->textureSize);
 470     vmesa->renderIndex = ~0;
 471     vmesa->setupIndex = ~0;
 472     vmesa->hwPrimitive = GL_POLYGON+1;
 473
 474     /* KW: Hardwire this.  Was previously set bogusly in
 475      * viaCreateBuffer.  Needs work before PBUFFER can be used:
 476      */
 477     vmesa->drawType = GLX_WINDOW_BIT;
 478
 479
 480     make_empty_list(&vmesa->TexObjList);
 481     make_empty_list(&vmesa->SwappedOut);
 482
 483     vmesa->CurrentTexObj[0] = 0;
 484     vmesa->CurrentTexObj[1] = 0;
 485
 486     _math_matrix_ctr(&vmesa->ViewportMatrix);
 487
 488     /* Do this early, before VIA_FLUSH_DMA can be called:
 489      */
 490     if (!AllocateDmaBuffer(mesaVis, vmesa)) {
 491         fprintf(stderr ,"AllocateDmaBuffer fail\n");
 492         FreeBuffer(vmesa);
 493         FREE(vmesa);
 494         return GL_FALSE;
 495     }
 496
 497     driInitExtensions( ctx, card_extensions, GL_TRUE );
 498     viaInitStateFuncs(ctx);
 499     viaInitTextures(ctx);
 500     viaInitTriFuncs(ctx);
 501     viaInitSpanFuncs(ctx);
 502     viaInitIoctlFuncs(ctx);
 503     viaInitState(ctx);
 504
 505 #ifdef DEBUG
 506     if (getenv("VIA_DEBUG"))
 507         VIA_DEBUG = 1;
 508     else
 509         VIA_DEBUG = 0;
 510 #endif
 511
 512     if (getenv("VIA_NO_RAST"))
 513        FALLBACK(vmesa, VIA_FALLBACK_USER_DISABLE, 1);
 514
 515     if (getenv("VIA_CONFORM"))
 516        vmesa->strictConformance = 1;
 517
 518     /* I don't understand why this isn't working:
 519      */
 520     vmesa->vblank_flags =
 521        vmesa->viaScreen->irqEnabled ?
 522         driGetDefaultVBlankFlags(&vmesa->optionCache) : VBLANK_FLAG_NO_IRQ;
 523
 524     /* Hack this up in its place:
 525      */
 526     vmesa->vblank_flags = getenv("VIA_VSYNC") ? VBLANK_FLAG_SYNC : VBLANK_FLAG_NO_IRQ;
 527
 528
 529     vmesa->get_ust = (PFNGLXGETUSTPROC) glXGetProcAddress( (const GLubyte *) "__glXGetUST" );
 530     if ( vmesa->get_ust == NULL ) {
 531        vmesa->get_ust = get_ust_nop;
 532     }
 533     vmesa->get_ust( &vmesa->swap_ust );
 534
 535
 536     vmesa->regMMIOBase = (GLuint *)((GLuint)viaScreen->reg);
 537     vmesa->pnGEMode = (GLuint *)((GLuint)viaScreen->reg + 0x4);
 538     vmesa->regEngineStatus = (GLuint *)((GLuint)viaScreen->reg + 0x400);
 539     vmesa->regTranSet = (GLuint *)((GLuint)viaScreen->reg + 0x43C);
 540     vmesa->regTranSpace = (GLuint *)((GLuint)viaScreen->reg + 0x440);
 541     vmesa->agpBase = viaScreen->agpBase;
 542     if (VIA_DEBUG) {
 543         fprintf(stderr, "regEngineStatus = %x\n", *vmesa->regEngineStatus);
 544     }
 545
 546     if (VIA_DEBUG) fprintf(stderr, "%s - out\n", __FUNCTION__);
 547     return GL_TRUE;
 548 }
 549
 550 void
 551 viaDestroyContext(__DRIcontextPrivate *driContextPriv)
 552 {
 553     GET_CURRENT_CONTEXT(ctx);
 554     viaContextPtr vmesa = (viaContextPtr)driContextPriv->driverPrivate;
 555     viaContextPtr current = ctx ? VIA_CONTEXT(ctx) : NULL;
 556     if (VIA_DEBUG) fprintf(stderr, "%s - in\n", __FUNCTION__);
 557     assert(vmesa); /* should never be null */
 558
 559     /* check if we're deleting the currently bound context */
 560     if (vmesa == current) {
 561       VIA_FLUSH_DMA(vmesa);
 562       _mesa_make_current2(NULL, NULL, NULL);
 563     }
 564
 565     if (vmesa) {
 566         /*=* John Sheng [2003.5.31]  agp tex *=*/
 567         WAIT_IDLE(vmesa);
 568         if(VIA_DEBUG) fprintf(stderr, "agpFullCount = %d\n", vmesa->agpFullCount);
 569
 570         _swsetup_DestroyContext(vmesa->glCtx);
 571         _tnl_DestroyContext(vmesa->glCtx);
 572         _ac_DestroyContext(vmesa->glCtx);
 573         _swrast_DestroyContext(vmesa->glCtx);
 574         FreeBuffer(vmesa);
 575         /* free the Mesa context */
 576         _mesa_destroy_context(vmesa->glCtx);
 577         FREE(vmesa);
 578     }
 579
 580     if (VIA_DEBUG) fprintf(stderr, "%s - out\n", __FUNCTION__);
 581 }
 582
 583
 584 void viaXMesaWindowMoved(viaContextPtr vmesa)
 585 {
 586    __DRIdrawablePrivate *dPriv = vmesa->driDrawable;
 587    GLuint bytePerPixel = vmesa->viaScreen->bitsPerPixel >> 3;
 588
 589    if (!dPriv)
 590       return;
 591
 592    switch (vmesa->glCtx->Color._DrawDestMask[0]) {
 593    case DD_FRONT_LEFT_BIT:
 594       if (dPriv->numBackClipRects == 0) {
 595          vmesa->numClipRects = dPriv->numClipRects;
 596          vmesa->pClipRects = dPriv->pClipRects;
 597       }
 598       else {
 599          vmesa->numClipRects = dPriv->numBackClipRects;
 600          vmesa->pClipRects = dPriv->pBackClipRects;
 601       }
 602       break;
 603    case DD_BACK_LEFT_BIT:
 604       vmesa->numClipRects = dPriv->numClipRects;
 605       vmesa->pClipRects = dPriv->pClipRects;
 606       break;
 607    default:
 608       vmesa->numClipRects = 0;
 609       break;
 610    }
 611
 612    if (vmesa->drawW != dPriv->w ||
 613        vmesa->drawH != dPriv->h)
 614       calculate_buffer_parameters( vmesa );
 615
 616    vmesa->drawXoff = (GLuint)(((dPriv->x * bytePerPixel) & 0x1f) / bytePerPixel);
 617    vmesa->drawX = dPriv->x - vmesa->drawXoff;
 618    vmesa->drawY = dPriv->y;
 619    vmesa->drawW = dPriv->w;
 620    vmesa->drawH = dPriv->h;
 621
 622    vmesa->front.orig = (vmesa->front.offset +
 623                         vmesa->drawY * vmesa->front.pitch +
 624                         vmesa->drawX * bytePerPixel);
 625
 626    vmesa->front.origMap = (vmesa->front.map +
 627                            vmesa->drawY * vmesa->front.pitch +
 628                            vmesa->drawX * bytePerPixel);
 629
 630    vmesa->back.orig = vmesa->back.offset;
 631    vmesa->depth.orig = vmesa->depth.offset;
 632    vmesa->back.origMap = vmesa->back.map;
 633    vmesa->depth.origMap = vmesa->depth.map;
 634
 635    viaCalcViewport(vmesa->glCtx);
 636 }
 637
 638 GLboolean
 639 viaUnbindContext(__DRIcontextPrivate *driContextPriv)
 640 {
 641     if (VIA_DEBUG) fprintf(stderr, "%s - in\n", __FUNCTION__);
 642     if (VIA_DEBUG) fprintf(stderr, "%s - out\n", __FUNCTION__);
 643     return GL_TRUE;
 644 }
 645
 646 GLboolean
 647 viaMakeCurrent(__DRIcontextPrivate *driContextPriv,
 648                __DRIdrawablePrivate *driDrawPriv,
 649                __DRIdrawablePrivate *driReadPriv)
 650 {
 651     if (VIA_DEBUG) fprintf(stderr, "%s - in\n", __FUNCTION__);
 652
 653     if (VIA_DEBUG) {
 654         fprintf(stderr, "driContextPriv = %08x\n", (GLuint)driContextPriv);
 655         fprintf(stderr, "driDrawPriv = %08x\n", (GLuint)driDrawPriv);
 656         fprintf(stderr, "driReadPriv = %08x\n", (GLuint)driReadPriv);
 657     }
 658
 659     if (driContextPriv) {
 660         viaContextPtr vmesa = (viaContextPtr)driContextPriv->driverPrivate;
 661         GLcontext *ctx = vmesa->glCtx;
 662
 663         if ( vmesa->driDrawable != driDrawPriv ) {
 664            driDrawableInitVBlank( driDrawPriv, vmesa->vblank_flags );
 665            vmesa->driDrawable = driDrawPriv;
 666            if ( ! calculate_buffer_parameters( vmesa ) ) {
 667               return GL_FALSE;
 668            }
 669            ctx->Driver.DrawBuffer( ctx, ctx->Color.DrawBuffer[0] );
 670         }
 671         if (VIA_DEBUG) fprintf(stderr, "viaMakeCurrent: w = %d\n", vmesa->driDrawable->w);
 672
 673         _mesa_make_current2(vmesa->glCtx,
 674                             (GLframebuffer *)driDrawPriv->driverPrivate,
 675                             (GLframebuffer *)driReadPriv->driverPrivate);
 676         if (VIA_DEBUG) fprintf(stderr, "Context %d MakeCurrent\n", vmesa->hHWContext);
 677
 678         viaXMesaWindowMoved(vmesa);
 679         ctx->Driver.Scissor(vmesa->glCtx,
 680                             vmesa->glCtx->Scissor.X,
 681                             vmesa->glCtx->Scissor.Y,
 682                             vmesa->glCtx->Scissor.Width,
 683                             vmesa->glCtx->Scissor.Height);
 684     }
 685     else {
 686         _mesa_make_current(0,0);
 687     }
 688
 689     if (VIA_DEBUG) fprintf(stderr, "%s - out\n", __FUNCTION__);
 690     return GL_TRUE;
 691 }
 692
 693 void viaGetLock(viaContextPtr vmesa, GLuint flags)
 694 {
 695     __DRIdrawablePrivate *dPriv = vmesa->driDrawable;
 696     __DRIscreenPrivate *sPriv = vmesa->driScreen;
 697
 698     drmGetLock(vmesa->driFd, vmesa->hHWContext, flags);
 699
 700     DRI_VALIDATE_DRAWABLE_INFO( sPriv, dPriv );
 701
 702     if (vmesa->sarea->ctxOwner != vmesa->hHWContext) {
 703        vmesa->sarea->ctxOwner = vmesa->hHWContext;
 704        vmesa->newEmitState = ~0;
 705     }
 706
 707     if (vmesa->lastStamp != dPriv->lastStamp) {
 708        viaXMesaWindowMoved(vmesa);
 709        vmesa->lastStamp = dPriv->lastStamp;
 710     }
 711 }
 712
 713
 714 void
 715 viaSwapBuffers(__DRIdrawablePrivate *drawablePrivate)
 716 {
 717     __DRIdrawablePrivate *dPriv = (__DRIdrawablePrivate *)drawablePrivate;
 718     if (VIA_DEBUG) fprintf(stderr, "%s - in\n", __FUNCTION__);
 719     if (dPriv && dPriv->driContextPriv && dPriv->driContextPriv->driverPrivate) {
 720         viaContextPtr vmesa;
 721         GLcontext *ctx;
 722
 723         vmesa = (viaContextPtr)dPriv->driContextPriv->driverPrivate;
 724         ctx = vmesa->glCtx;
 725         if (ctx->Visual.doubleBufferMode) {
 726             _mesa_notifySwapBuffers(ctx);
 727             if (vmesa->doPageFlip) {
 728                 viaPageFlip(dPriv);
 729             }
 730             else {
 731                 viaCopyBuffer(dPriv);
 732             }
 733         }
 734         else
 735             VIA_FLUSH_DMA(vmesa);
 736     }
 737     else {
 738         _mesa_problem(NULL, "viaSwapBuffers: drawable has no context!\n");
 739     }
 740     if (VIA_DEBUG) fprintf(stderr, "%s - out\n", __FUNCTION__);
 741 }