src/mesa/swrast/s_context.c

   1 /*
   2  * Mesa 3-D graphics library
   3  * Version:  6.5.1
   4  *
   5  * Copyright (C) 1999-2006  Brian Paul   All Rights Reserved.
   6  *
   7  * Permission is hereby granted, free of charge, to any person obtaining a
   8  * copy of this software and associated documentation files (the "Software"),
   9  * to deal in the Software without restriction, including without limitation
  10  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
  11  * and/or sell copies of the Software, and to permit persons to whom the
  12  * Software is furnished to do so, subject to the following conditions:
  13  *
  14  * The above copyright notice and this permission notice shall be included
  15  * in all copies or substantial portions of the Software.
  16  *
  17  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  18  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  19  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  20  * BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
  21  * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  22  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  23  *
  24  * Authors:
  25  *    Keith Whitwell <keith@tungstengraphics.com>
  26  *    Brian Paul
  27  */
  28
  29 #include "imports.h"
  30 #include "bufferobj.h"
  31 #include "context.h"
  32 #include "colormac.h"
  33 #include "mtypes.h"
  34 #include "program.h"
  35 #include "teximage.h"
  36 #include "swrast.h"
  37 #include "s_blend.h"
  38 #include "s_context.h"
  39 #include "s_lines.h"
  40 #include "s_points.h"
  41 #include "s_span.h"
  42 #include "s_triangle.h"
  43 #include "s_texfilter.h"
  44
  45
  46 /**
  47  * Recompute the value of swrast->_RasterMask, etc. according to
  48  * the current context.  The _RasterMask field can be easily tested by
  49  * drivers to determine certain basic GL state (does the primitive need
  50  * stenciling, logic-op, fog, etc?).
  51  */
  52 static void
  53 _swrast_update_rasterflags( GLcontext *ctx )
  54 {
  55    SWcontext *swrast = SWRAST_CONTEXT(ctx);
  56    GLbitfield rasterMask = 0;
  57
  58    if (ctx->Color.AlphaEnabled)           rasterMask |= ALPHATEST_BIT;
  59    if (ctx->Color.BlendEnabled)           rasterMask |= BLEND_BIT;
  60    if (ctx->Depth.Test)                   rasterMask |= DEPTH_BIT;
  61    if (swrast->_FogEnabled)               rasterMask |= FOG_BIT;
  62    if (ctx->Scissor.Enabled)              rasterMask |= CLIP_BIT;
  63    if (ctx->Stencil.Enabled)              rasterMask |= STENCIL_BIT;
  64    if (ctx->Visual.rgbMode) {
  65       const GLuint colorMask = *((GLuint *) &ctx->Color.ColorMask);
  66       if (colorMask != 0xffffffff)        rasterMask |= MASKING_BIT;
  67       if (ctx->Color._LogicOpEnabled)     rasterMask |= LOGIC_OP_BIT;
  68       if (ctx->Texture._EnabledUnits)     rasterMask |= TEXTURE_BIT;
  69    }
  70    else {
  71       if (ctx->Color.IndexMask != 0xffffffff) rasterMask |= MASKING_BIT;
  72       if (ctx->Color.IndexLogicOpEnabled)     rasterMask |= LOGIC_OP_BIT;
  73    }
  74
  75    if (   ctx->Viewport.X < 0
  76        || ctx->Viewport.X + ctx->Viewport.Width > (GLint) ctx->DrawBuffer->Width
  77        || ctx->Viewport.Y < 0
  78        || ctx->Viewport.Y + ctx->Viewport.Height > (GLint) ctx->DrawBuffer->Height) {
  79       rasterMask |= CLIP_BIT;
  80    }
  81
  82    if (ctx->Query.CurrentOcclusionObject)
  83       rasterMask |= OCCLUSION_BIT;
  84
  85
  86    /* If we're not drawing to exactly one color buffer set the
  87     * MULTI_DRAW_BIT flag.  Also set it if we're drawing to no
  88     * buffers or the RGBA or CI mask disables all writes.
  89     */
  90    if (ctx->DrawBuffer->_NumColorDrawBuffers[0] != 1) {
  91       /* more than one color buffer designated for writing (or zero buffers) */
  92       rasterMask |= MULTI_DRAW_BIT;
  93    }
  94    else if (ctx->Visual.rgbMode && *((GLuint *) ctx->Color.ColorMask) == 0) {
  95       rasterMask |= MULTI_DRAW_BIT; /* all RGBA channels disabled */
  96    }
  97    else if (!ctx->Visual.rgbMode && ctx->Color.IndexMask==0) {
  98       rasterMask |= MULTI_DRAW_BIT; /* all color index bits disabled */
  99    }
 100
 101    if (ctx->FragmentProgram._Enabled) {
 102       rasterMask |= FRAGPROG_BIT;
 103    }
 104
 105    if (ctx->ShaderObjects._FragmentShaderPresent) {
 106       rasterMask |= FRAGPROG_BIT;
 107    }
 108
 109    if (ctx->ATIFragmentShader._Enabled) {
 110       rasterMask |= ATIFRAGSHADER_BIT;
 111    }
 112
 113 #if CHAN_TYPE == GL_FLOAT
 114    if (ctx->Color.ClampFragmentColor == GL_TRUE) {
 115       rasterMask |= CLAMPING_BIT;
 116    }
 117 #endif
 118
 119    SWRAST_CONTEXT(ctx)->_RasterMask = rasterMask;
 120 }
 121
 122
 123 /**
 124  * Examine polycon culls tate to compute the _BackfaceSign field.
 125  * _BackfaceSign will be 0 if no culling, -1 if culling back-faces,
 126  * and 1 if culling front-faces.  The Polygon FrontFace state also
 127  * factors in.
 128  */
 129 static void
 130 _swrast_update_polygon( GLcontext *ctx )
 131 {
 132    GLfloat backface_sign = 1;
 133
 134    if (ctx->Polygon.CullFlag) {
 135       backface_sign = 1;
 136       switch(ctx->Polygon.CullFaceMode) {
 137       case GL_BACK:
 138          if(ctx->Polygon.FrontFace==GL_CCW)
 139             backface_sign = -1;
 140          break;
 141       case GL_FRONT:
 142          if(ctx->Polygon.FrontFace!=GL_CCW)
 143             backface_sign = -1;
 144          break;
 145       default:
 146       case GL_FRONT_AND_BACK:
 147          backface_sign = 0;
 148          break;
 149       }
 150    }
 151    else {
 152       backface_sign = 0;
 153    }
 154
 155    SWRAST_CONTEXT(ctx)->_BackfaceSign = backface_sign;
 156 }
 157
 158
 159 /**
 160  * Update the _PreferPixelFog field to indicate if we need to compute
 161  * fog factors per-fragment.
 162  */
 163 static void
 164 _swrast_update_fog_hint( GLcontext *ctx )
 165 {
 166    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 167    swrast->_PreferPixelFog = (!swrast->AllowVertexFog ||
 168                               ctx->FragmentProgram._Enabled || /* not _Active! */
 169                               (ctx->Hint.Fog == GL_NICEST &&
 170                                swrast->AllowPixelFog));
 171 }
 172
 173
 174
 175 /**
 176  * Update the swrast->_AnyTextureCombine flag.
 177  */
 178 static void
 179 _swrast_update_texture_env( GLcontext *ctx )
 180 {
 181    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 182    GLuint i;
 183    swrast->_AnyTextureCombine = GL_FALSE;
 184    for (i = 0; i < ctx->Const.MaxTextureUnits; i++) {
 185       if (ctx->Texture.Unit[i].EnvMode == GL_COMBINE_EXT ||
 186           ctx->Texture.Unit[i].EnvMode == GL_COMBINE4_NV) {
 187          swrast->_AnyTextureCombine = GL_TRUE;
 188          return;
 189       }
 190    }
 191 }
 192
 193
 194 /**
 195  * Update swrast->_FogColor and swrast->_FogEnable values.
 196  */
 197 static void
 198 _swrast_update_fog_state( GLcontext *ctx )
 199 {
 200    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 201
 202    /* determine if fog is needed, and if so, which fog mode */
 203    swrast->_FogEnabled = GL_FALSE;
 204    if (ctx->FragmentProgram._Enabled) {
 205       if (ctx->FragmentProgram._Current->Base.Target==GL_FRAGMENT_PROGRAM_ARB) {
 206          const struct gl_fragment_program *fp
 207             = ctx->FragmentProgram._Current;
 208          if (fp->FogOption != GL_NONE) {
 209             swrast->_FogEnabled = GL_TRUE;
 210             swrast->_FogMode = fp->FogOption;
 211          }
 212       }
 213    }
 214    else if (ctx->Fog.Enabled) {
 215       swrast->_FogEnabled = GL_TRUE;
 216       swrast->_FogMode = ctx->Fog.Mode;
 217    }
 218 }
 219
 220
 221 /**
 222  * Update state for running fragment programs.  Basically, load the
 223  * program parameters with current state values.
 224  */
 225 static void
 226 _swrast_update_fragment_program( GLcontext *ctx )
 227 {
 228    if (ctx->FragmentProgram._Enabled) {
 229       const struct gl_fragment_program *fp = ctx->FragmentProgram._Current;
 230       _mesa_load_state_parameters(ctx, fp->Base.Parameters);
 231    }
 232 }
 233
 234
 235
 236 #define _SWRAST_NEW_DERIVED (_SWRAST_NEW_RASTERMASK |   \
 237                              _NEW_TEXTURE |             \
 238                              _NEW_HINT |                \
 239                              _NEW_POLYGON )
 240
 241 /* State referenced by _swrast_choose_triangle, _swrast_choose_line.
 242  */
 243 #define _SWRAST_NEW_TRIANGLE (_SWRAST_NEW_DERIVED |             \
 244                               _NEW_RENDERMODE|                  \
 245                               _NEW_POLYGON|                     \
 246                               _NEW_DEPTH|                       \
 247                               _NEW_STENCIL|                     \
 248                               _NEW_COLOR|                       \
 249                               _NEW_TEXTURE|                     \
 250                               _SWRAST_NEW_RASTERMASK|           \
 251                               _NEW_LIGHT|                       \
 252                               _NEW_FOG |                        \
 253                               _DD_NEW_SEPARATE_SPECULAR)
 254
 255 #define _SWRAST_NEW_LINE (_SWRAST_NEW_DERIVED |         \
 256                           _NEW_RENDERMODE|              \
 257                           _NEW_LINE|                    \
 258                           _NEW_TEXTURE|                 \
 259                           _NEW_LIGHT|                   \
 260                           _NEW_FOG|                     \
 261                           _NEW_DEPTH |                  \
 262                           _DD_NEW_SEPARATE_SPECULAR)
 263
 264 #define _SWRAST_NEW_POINT (_SWRAST_NEW_DERIVED |        \
 265                            _NEW_RENDERMODE |            \
 266                            _NEW_POINT |                 \
 267                            _NEW_TEXTURE |               \
 268                            _NEW_LIGHT |                 \
 269                            _NEW_FOG |                   \
 270                            _DD_NEW_SEPARATE_SPECULAR)
 271
 272 #define _SWRAST_NEW_TEXTURE_SAMPLE_FUNC _NEW_TEXTURE
 273
 274 #define _SWRAST_NEW_TEXTURE_ENV_MODE _NEW_TEXTURE
 275
 276 #define _SWRAST_NEW_BLEND_FUNC _NEW_COLOR
 277
 278
 279
 280 /**
 281  * Stub for swrast->Triangle to select a true triangle function
 282  * after a state change.
 283  */
 284 static void
 285 _swrast_validate_triangle( GLcontext *ctx,
 286                            const SWvertex *v0,
 287                            const SWvertex *v1,
 288                            const SWvertex *v2 )
 289 {
 290    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 291
 292    _swrast_validate_derived( ctx );
 293    swrast->choose_triangle( ctx );
 294
 295    if (ctx->Texture._EnabledUnits == 0
 296        && NEED_SECONDARY_COLOR(ctx)
 297        && !ctx->FragmentProgram._Enabled) {
 298       /* separate specular color, but no texture */
 299       swrast->SpecTriangle = swrast->Triangle;
 300       swrast->Triangle = _swrast_add_spec_terms_triangle;
 301    }
 302
 303    swrast->Triangle( ctx, v0, v1, v2 );
 304 }
 305
 306 /**
 307  * Called via swrast->Line.  Examine current GL state and choose a software
 308  * line routine.  Then call it.
 309  */
 310 static void
 311 _swrast_validate_line( GLcontext *ctx, const SWvertex *v0, const SWvertex *v1 )
 312 {
 313    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 314
 315    _swrast_validate_derived( ctx );
 316    swrast->choose_line( ctx );
 317
 318    if (ctx->Texture._EnabledUnits == 0
 319        && NEED_SECONDARY_COLOR(ctx)
 320        && !ctx->FragmentProgram._Enabled) {
 321       swrast->SpecLine = swrast->Line;
 322       swrast->Line = _swrast_add_spec_terms_line;
 323    }
 324
 325
 326    swrast->Line( ctx, v0, v1 );
 327 }
 328
 329 /**
 330  * Called via swrast->Point.  Examine current GL state and choose a software
 331  * point routine.  Then call it.
 332  */
 333 static void
 334 _swrast_validate_point( GLcontext *ctx, const SWvertex *v0 )
 335 {
 336    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 337
 338    _swrast_validate_derived( ctx );
 339    swrast->choose_point( ctx );
 340
 341    if (ctx->Texture._EnabledUnits == 0
 342        && NEED_SECONDARY_COLOR(ctx)
 343        && !ctx->FragmentProgram._Enabled) {
 344       swrast->SpecPoint = swrast->Point;
 345       swrast->Point = _swrast_add_spec_terms_point;
 346    }
 347
 348    swrast->Point( ctx, v0 );
 349 }
 350
 351
 352 /**
 353  * Called via swrast->BlendFunc.  Examine GL state to choose a blending
 354  * function, then call it.
 355  */
 356 static void _ASMAPI
 357 _swrast_validate_blend_func(GLcontext *ctx, GLuint n, const GLubyte mask[],
 358                             GLchan src[][4], CONST GLchan dst[][4],
 359                             GLenum chanType )
 360 {
 361    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 362
 363    _swrast_validate_derived( ctx );
 364    _swrast_choose_blend_func( ctx );
 365
 366    swrast->BlendFunc( ctx, n, mask, src, dst, chanType );
 367 }
 368
 369
 370 /**
 371  * Make sure we have texture image data for all the textures we may need
 372  * for subsequent rendering.
 373  */
 374 static void
 375 _swrast_validate_texture_images(GLcontext *ctx)
 376 {
 377    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 378    GLuint u;
 379
 380    if (!swrast->ValidateTextureImage || !ctx->Texture._EnabledUnits) {
 381       /* no textures enabled, or no way to validate images! */
 382       return;
 383    }
 384
 385    for (u = 0; u < ctx->Const.MaxTextureImageUnits; u++) {
 386       if (ctx->Texture.Unit[u]._ReallyEnabled) {
 387          struct gl_texture_object *texObj = ctx->Texture.Unit[u]._Current;
 388          ASSERT(texObj);
 389          if (texObj) {
 390             GLuint numFaces = (texObj->Target == GL_TEXTURE_CUBE_MAP) ? 6 : 1;
 391             GLuint face;
 392             for (face = 0; face < numFaces; face++) {
 393                GLuint lvl;
 394                for (lvl = texObj->BaseLevel; lvl <= texObj->_MaxLevel; lvl++) {
 395                   struct gl_texture_image *texImg = texObj->Image[face][lvl];
 396                   if (texImg && !texImg->Data) {
 397                      swrast->ValidateTextureImage(ctx, texObj, face, lvl);
 398                      ASSERT(texObj->Image[face][lvl]->Data);
 399                   }
 400                }
 401             }
 402          }
 403       }
 404    }
 405 }
 406
 407
 408 /**
 409  * Free the texture image data attached to all currently enabled
 410  * textures.  Meant to be called by device drivers when transitioning
 411  * from software to hardware rendering.
 412  */
 413 void
 414 _swrast_eject_texture_images(GLcontext *ctx)
 415 {
 416    GLuint u;
 417
 418    if (!ctx->Texture._EnabledUnits) {
 419       /* no textures enabled */
 420       return;
 421    }
 422
 423    for (u = 0; u < ctx->Const.MaxTextureImageUnits; u++) {
 424       if (ctx->Texture.Unit[u]._ReallyEnabled) {
 425          struct gl_texture_object *texObj = ctx->Texture.Unit[u]._Current;
 426          ASSERT(texObj);
 427          if (texObj) {
 428             GLuint numFaces = (texObj->Target == GL_TEXTURE_CUBE_MAP) ? 6 : 1;
 429             GLuint face;
 430             for (face = 0; face < numFaces; face++) {
 431                GLuint lvl;
 432                for (lvl = texObj->BaseLevel; lvl <= texObj->_MaxLevel; lvl++) {
 433                   struct gl_texture_image *texImg = texObj->Image[face][lvl];
 434                   if (texImg && texImg->Data) {
 435                      _mesa_free_texmemory(texImg->Data);
 436                      texImg->Data = NULL;
 437                   }
 438                }
 439             }
 440          }
 441       }
 442    }
 443 }
 444
 445
 446
 447 static void
 448 _swrast_sleep( GLcontext *ctx, GLbitfield new_state )
 449 {
 450    (void) ctx; (void) new_state;
 451 }
 452
 453
 454 static void
 455 _swrast_invalidate_state( GLcontext *ctx, GLbitfield new_state )
 456 {
 457    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 458    GLuint i;
 459
 460    swrast->NewState |= new_state;
 461
 462    /* After 10 statechanges without any swrast functions being called,
 463     * put the module to sleep.
 464     */
 465    if (++swrast->StateChanges > 10) {
 466       swrast->InvalidateState = _swrast_sleep;
 467       swrast->NewState = ~0;
 468       new_state = ~0;
 469    }
 470
 471    if (new_state & swrast->InvalidateTriangleMask)
 472       swrast->Triangle = _swrast_validate_triangle;
 473
 474    if (new_state & swrast->InvalidateLineMask)
 475       swrast->Line = _swrast_validate_line;
 476
 477    if (new_state & swrast->InvalidatePointMask)
 478       swrast->Point = _swrast_validate_point;
 479
 480    if (new_state & _SWRAST_NEW_BLEND_FUNC)
 481       swrast->BlendFunc = _swrast_validate_blend_func;
 482
 483    if (new_state & _SWRAST_NEW_TEXTURE_SAMPLE_FUNC)
 484       for (i = 0 ; i < ctx->Const.MaxTextureImageUnits ; i++)
 485          swrast->TextureSample[i] = NULL;
 486 }
 487
 488
 489 static void
 490 _swrast_update_texture_samplers(GLcontext *ctx)
 491 {
 492    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 493    GLuint u;
 494
 495    for (u = 0; u < ctx->Const.MaxTextureImageUnits; u++) {
 496       const struct gl_texture_object *tObj = ctx->Texture.Unit[u]._Current;
 497       if (tObj)
 498          swrast->TextureSample[u] =
 499             _swrast_choose_texture_sample_func(ctx, tObj);
 500    }
 501 }
 502
 503
 504 void
 505 _swrast_validate_derived( GLcontext *ctx )
 506 {
 507    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 508
 509    if (swrast->NewState) {
 510       if (swrast->NewState & _NEW_POLYGON)
 511          _swrast_update_polygon( ctx );
 512
 513       if (swrast->NewState & (_NEW_HINT | _NEW_PROGRAM))
 514          _swrast_update_fog_hint( ctx );
 515
 516       if (swrast->NewState & _SWRAST_NEW_TEXTURE_ENV_MODE)
 517          _swrast_update_texture_env( ctx );
 518
 519       if (swrast->NewState & (_NEW_FOG | _NEW_PROGRAM))
 520          _swrast_update_fog_state( ctx );
 521
 522       if (swrast->NewState & _NEW_PROGRAM)
 523          _swrast_update_fragment_program( ctx );
 524
 525       if (swrast->NewState & _NEW_TEXTURE)
 526          _swrast_update_texture_samplers( ctx );
 527
 528       if (swrast->NewState & (_NEW_TEXTURE | _NEW_PROGRAM))
 529          _swrast_validate_texture_images( ctx );
 530
 531       if (swrast->NewState & _SWRAST_NEW_RASTERMASK)
 532          _swrast_update_rasterflags( ctx );
 533
 534       swrast->NewState = 0;
 535       swrast->StateChanges = 0;
 536       swrast->InvalidateState = _swrast_invalidate_state;
 537    }
 538 }
 539
 540 #define SWRAST_DEBUG 0
 541
 542 /* Public entrypoints:  See also s_accum.c, s_bitmap.c, etc.
 543  */
 544 void
 545 _swrast_Quad( GLcontext *ctx,
 546               const SWvertex *v0, const SWvertex *v1,
 547               const SWvertex *v2, const SWvertex *v3 )
 548 {
 549    if (SWRAST_DEBUG) {
 550       _mesa_debug(ctx, "_swrast_Quad\n");
 551       _swrast_print_vertex( ctx, v0 );
 552       _swrast_print_vertex( ctx, v1 );
 553       _swrast_print_vertex( ctx, v2 );
 554       _swrast_print_vertex( ctx, v3 );
 555    }
 556    SWRAST_CONTEXT(ctx)->Triangle( ctx, v0, v1, v3 );
 557    SWRAST_CONTEXT(ctx)->Triangle( ctx, v1, v2, v3 );
 558 }
 559
 560 void
 561 _swrast_Triangle( GLcontext *ctx, const SWvertex *v0,
 562                   const SWvertex *v1, const SWvertex *v2 )
 563 {
 564    if (SWRAST_DEBUG) {
 565       _mesa_debug(ctx, "_swrast_Triangle\n");
 566       _swrast_print_vertex( ctx, v0 );
 567       _swrast_print_vertex( ctx, v1 );
 568       _swrast_print_vertex( ctx, v2 );
 569    }
 570    SWRAST_CONTEXT(ctx)->Triangle( ctx, v0, v1, v2 );
 571 }
 572
 573 void
 574 _swrast_Line( GLcontext *ctx, const SWvertex *v0, const SWvertex *v1 )
 575 {
 576    if (SWRAST_DEBUG) {
 577       _mesa_debug(ctx, "_swrast_Line\n");
 578       _swrast_print_vertex( ctx, v0 );
 579       _swrast_print_vertex( ctx, v1 );
 580    }
 581    SWRAST_CONTEXT(ctx)->Line( ctx, v0, v1 );
 582 }
 583
 584 void
 585 _swrast_Point( GLcontext *ctx, const SWvertex *v0 )
 586 {
 587    if (SWRAST_DEBUG) {
 588       _mesa_debug(ctx, "_swrast_Point\n");
 589       _swrast_print_vertex( ctx, v0 );
 590    }
 591    SWRAST_CONTEXT(ctx)->Point( ctx, v0 );
 592 }
 593
 594 void
 595 _swrast_InvalidateState( GLcontext *ctx, GLbitfield new_state )
 596 {
 597    if (SWRAST_DEBUG) {
 598       _mesa_debug(ctx, "_swrast_InvalidateState\n");
 599    }
 600    SWRAST_CONTEXT(ctx)->InvalidateState( ctx, new_state );
 601 }
 602
 603 void
 604 _swrast_ResetLineStipple( GLcontext *ctx )
 605 {
 606    if (SWRAST_DEBUG) {
 607       _mesa_debug(ctx, "_swrast_ResetLineStipple\n");
 608    }
 609    SWRAST_CONTEXT(ctx)->StippleCounter = 0;
 610 }
 611
 612 void
 613 _swrast_allow_vertex_fog( GLcontext *ctx, GLboolean value )
 614 {
 615    if (SWRAST_DEBUG) {
 616       _mesa_debug(ctx, "_swrast_allow_vertex_fog %d\n", value);
 617    }
 618    SWRAST_CONTEXT(ctx)->InvalidateState( ctx, _NEW_HINT );
 619    SWRAST_CONTEXT(ctx)->AllowVertexFog = value;
 620 }
 621
 622 void
 623 _swrast_allow_pixel_fog( GLcontext *ctx, GLboolean value )
 624 {
 625    if (SWRAST_DEBUG) {
 626       _mesa_debug(ctx, "_swrast_allow_pixel_fog %d\n", value);
 627    }
 628    SWRAST_CONTEXT(ctx)->InvalidateState( ctx, _NEW_HINT );
 629    SWRAST_CONTEXT(ctx)->AllowPixelFog = value;
 630 }
 631
 632
 633 GLboolean
 634 _swrast_CreateContext( GLcontext *ctx )
 635 {
 636    GLuint i;
 637    SWcontext *swrast = (SWcontext *)CALLOC(sizeof(SWcontext));
 638
 639    if (SWRAST_DEBUG) {
 640       _mesa_debug(ctx, "_swrast_CreateContext\n");
 641    }
 642
 643    if (!swrast)
 644       return GL_FALSE;
 645
 646    swrast->NewState = ~0;
 647
 648    swrast->choose_point = _swrast_choose_point;
 649    swrast->choose_line = _swrast_choose_line;
 650    swrast->choose_triangle = _swrast_choose_triangle;
 651
 652    swrast->InvalidatePointMask = _SWRAST_NEW_POINT;
 653    swrast->InvalidateLineMask = _SWRAST_NEW_LINE;
 654    swrast->InvalidateTriangleMask = _SWRAST_NEW_TRIANGLE;
 655
 656    swrast->Point = _swrast_validate_point;
 657    swrast->Line = _swrast_validate_line;
 658    swrast->Triangle = _swrast_validate_triangle;
 659    swrast->InvalidateState = _swrast_sleep;
 660    swrast->BlendFunc = _swrast_validate_blend_func;
 661
 662    swrast->AllowVertexFog = GL_TRUE;
 663    swrast->AllowPixelFog = GL_TRUE;
 664
 665    /* Optimized Accum buffer */
 666    swrast->_IntegerAccumMode = GL_FALSE;
 667    swrast->_IntegerAccumScaler = 0.0;
 668
 669    for (i = 0; i < MAX_TEXTURE_IMAGE_UNITS; i++)
 670       swrast->TextureSample[i] = NULL;
 671
 672    swrast->SpanArrays = MALLOC_STRUCT(span_arrays);
 673    if (!swrast->SpanArrays) {
 674       FREE(swrast);
 675       return GL_FALSE;
 676    }
 677    swrast->SpanArrays->ChanType = CHAN_TYPE;
 678 #if CHAN_TYPE == GL_UNSIGNED_BYTE
 679    swrast->SpanArrays->rgba = swrast->SpanArrays->color.sz1.rgba;
 680    swrast->SpanArrays->spec = swrast->SpanArrays->color.sz1.spec;
 681 #elif CHAN_TYPE == GL_UNSIGNED_SHORT
 682    swrast->SpanArrays->rgba = swrast->SpanArrays->color.sz2.rgba;
 683    swrast->SpanArrays->spec = swrast->SpanArrays->color.sz2.spec;
 684 #else
 685    swrast->SpanArrays->rgba = swrast->SpanArrays->color.sz4.rgba;
 686    swrast->SpanArrays->spec = swrast->SpanArrays->color.sz4.spec;
 687 #endif
 688
 689    /* init point span buffer */
 690    swrast->PointSpan.primitive = GL_POINT;
 691    swrast->PointSpan.start = 0;
 692    swrast->PointSpan.end = 0;
 693    swrast->PointSpan.facing = 0;
 694    swrast->PointSpan.array = swrast->SpanArrays;
 695
 696    swrast->TexelBuffer = (GLchan *) MALLOC(ctx->Const.MaxTextureImageUnits *
 697                                            MAX_WIDTH * 4 * sizeof(GLchan));
 698    if (!swrast->TexelBuffer) {
 699       FREE(swrast->SpanArrays);
 700       FREE(swrast);
 701       return GL_FALSE;
 702    }
 703
 704    ctx->swrast_context = swrast;
 705
 706    return GL_TRUE;
 707 }
 708
 709 void
 710 _swrast_DestroyContext( GLcontext *ctx )
 711 {
 712    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 713
 714    if (SWRAST_DEBUG) {
 715       _mesa_debug(ctx, "_swrast_DestroyContext\n");
 716    }
 717
 718    FREE( swrast->SpanArrays );
 719    FREE( swrast->TexelBuffer );
 720    FREE( swrast );
 721
 722    ctx->swrast_context = 0;
 723 }
 724
 725
 726 struct swrast_device_driver *
 727 _swrast_GetDeviceDriverReference( GLcontext *ctx )
 728 {
 729    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 730    return &swrast->Driver;
 731 }
 732
 733 void
 734 _swrast_flush( GLcontext *ctx )
 735 {
 736    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 737    /* flush any pending fragments from rendering points */
 738    if (swrast->PointSpan.end > 0) {
 739       if (ctx->Visual.rgbMode) {
 740          _swrast_write_rgba_span(ctx, &(swrast->PointSpan));
 741       }
 742       else {
 743          _swrast_write_index_span(ctx, &(swrast->PointSpan));
 744       }
 745       swrast->PointSpan.end = 0;
 746    }
 747 }
 748
 749 void
 750 _swrast_render_primitive( GLcontext *ctx, GLenum prim )
 751 {
 752    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 753    if (swrast->Primitive == GL_POINTS && prim != GL_POINTS) {
 754       _swrast_flush(ctx);
 755    }
 756    swrast->Primitive = prim;
 757 }
 758
 759
 760 void
 761 _swrast_render_start( GLcontext *ctx )
 762 {
 763    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 764    if (swrast->Driver.SpanRenderStart)
 765       swrast->Driver.SpanRenderStart( ctx );
 766    swrast->PointSpan.end = 0;
 767 }
 768
 769 void
 770 _swrast_render_finish( GLcontext *ctx )
 771 {
 772    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 773    if (swrast->Driver.SpanRenderFinish)
 774       swrast->Driver.SpanRenderFinish( ctx );
 775
 776    _swrast_flush(ctx);
 777 }
 778
 779
 780 #define SWRAST_DEBUG_VERTICES 0
 781
 782 void
 783 _swrast_print_vertex( GLcontext *ctx, const SWvertex *v )
 784 {
 785    GLuint i;
 786
 787    if (SWRAST_DEBUG_VERTICES) {
 788       _mesa_debug(ctx, "win %f %f %f %f\n",
 789                   v->win[0], v->win[1], v->win[2], v->win[3]);
 790
 791       for (i = 0 ; i < ctx->Const.MaxTextureCoordUnits ; i++)
 792          if (ctx->Texture.Unit[i]._ReallyEnabled)
 793             _mesa_debug(ctx, "texcoord[%d] %f %f %f %f\n", i,
 794                         v->texcoord[i][0], v->texcoord[i][1],
 795                         v->texcoord[i][2], v->texcoord[i][3]);
 796
 797 #if CHAN_TYPE == GL_FLOAT
 798       _mesa_debug(ctx, "color %f %f %f %f\n",
 799                   v->color[0], v->color[1], v->color[2], v->color[3]);
 800       _mesa_debug(ctx, "spec %f %f %f %f\n",
 801                   v->specular[0], v->specular[1],
 802                   v->specular[2], v->specular[3]);
 803 #else
 804       _mesa_debug(ctx, "color %d %d %d %d\n",
 805                   v->color[0], v->color[1], v->color[2], v->color[3]);
 806       _mesa_debug(ctx, "spec %d %d %d %d\n",
 807                   v->specular[0], v->specular[1],
 808                   v->specular[2], v->specular[3]);
 809 #endif
 810       _mesa_debug(ctx, "fog %f\n", v->fog);
 811       _mesa_debug(ctx, "index %d\n", v->index);
 812       _mesa_debug(ctx, "pointsize %f\n", v->pointSize);
 813       _mesa_debug(ctx, "\n");
 814    }
 815 }