src/mesa/swrast/s_context.c

   1 /*
   2  * Mesa 3-D graphics library
   3  * Version:  6.5.3
   4  *
   5  * Copyright (C) 1999-2007  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 "prog_statevars.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._Current) {
 102       rasterMask |= FRAGPROG_BIT;
 103    }
 104
 105    if (ctx->Shader._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._Current ||
 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    const struct gl_fragment_program *fp = ctx->FragmentProgram._Current;
 202
 203    /* determine if fog is needed, and if so, which fog mode */
 204    swrast->_FogEnabled = GL_FALSE;
 205    if (fp && fp->Base.Target == GL_FRAGMENT_PROGRAM_ARB) {
 206       if (fp->FogOption != GL_NONE) {
 207          swrast->_FogEnabled = GL_TRUE;
 208          swrast->_FogMode = fp->FogOption;
 209       }
 210    }
 211    else if (ctx->Fog.Enabled) {
 212       swrast->_FogEnabled = GL_TRUE;
 213       swrast->_FogMode = ctx->Fog.Mode;
 214    }
 215 }
 216
 217
 218 /**
 219  * Update state for running fragment programs.  Basically, load the
 220  * program parameters with current state values.
 221  */
 222 static void
 223 _swrast_update_fragment_program(GLcontext *ctx, GLbitfield newState)
 224 {
 225    const struct gl_fragment_program *fp = ctx->FragmentProgram._Current;
 226    if (fp) {
 227 #if 0
 228       /* XXX Need a way to trigger the initial loading of parameters
 229        * even when there's no recent state changes.
 230        */
 231       if (fp->Base.Parameters->StateFlags & newState)
 232 #endif
 233          _mesa_load_state_parameters(ctx, fp->Base.Parameters);
 234    }
 235 }
 236
 237
 238
 239 #define _SWRAST_NEW_DERIVED (_SWRAST_NEW_RASTERMASK |   \
 240                              _NEW_TEXTURE |             \
 241                              _NEW_HINT |                \
 242                              _NEW_POLYGON )
 243
 244 /* State referenced by _swrast_choose_triangle, _swrast_choose_line.
 245  */
 246 #define _SWRAST_NEW_TRIANGLE (_SWRAST_NEW_DERIVED |             \
 247                               _NEW_RENDERMODE|                  \
 248                               _NEW_POLYGON|                     \
 249                               _NEW_DEPTH|                       \
 250                               _NEW_STENCIL|                     \
 251                               _NEW_COLOR|                       \
 252                               _NEW_TEXTURE|                     \
 253                               _SWRAST_NEW_RASTERMASK|           \
 254                               _NEW_LIGHT|                       \
 255                               _NEW_FOG |                        \
 256                               _DD_NEW_SEPARATE_SPECULAR)
 257
 258 #define _SWRAST_NEW_LINE (_SWRAST_NEW_DERIVED |         \
 259                           _NEW_RENDERMODE|              \
 260                           _NEW_LINE|                    \
 261                           _NEW_TEXTURE|                 \
 262                           _NEW_LIGHT|                   \
 263                           _NEW_FOG|                     \
 264                           _NEW_DEPTH |                  \
 265                           _DD_NEW_SEPARATE_SPECULAR)
 266
 267 #define _SWRAST_NEW_POINT (_SWRAST_NEW_DERIVED |        \
 268                            _NEW_RENDERMODE |            \
 269                            _NEW_POINT |                 \
 270                            _NEW_TEXTURE |               \
 271                            _NEW_LIGHT |                 \
 272                            _NEW_FOG |                   \
 273                            _DD_NEW_SEPARATE_SPECULAR)
 274
 275 #define _SWRAST_NEW_TEXTURE_SAMPLE_FUNC _NEW_TEXTURE
 276
 277 #define _SWRAST_NEW_TEXTURE_ENV_MODE _NEW_TEXTURE
 278
 279 #define _SWRAST_NEW_BLEND_FUNC _NEW_COLOR
 280
 281
 282
 283 /**
 284  * Stub for swrast->Triangle to select a true triangle function
 285  * after a state change.
 286  */
 287 static void
 288 _swrast_validate_triangle( GLcontext *ctx,
 289                            const SWvertex *v0,
 290                            const SWvertex *v1,
 291                            const SWvertex *v2 )
 292 {
 293    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 294
 295    _swrast_validate_derived( ctx );
 296    swrast->choose_triangle( ctx );
 297    ASSERT(swrast->Triangle);
 298
 299    if (ctx->Texture._EnabledUnits == 0
 300        && NEED_SECONDARY_COLOR(ctx)
 301        && !ctx->FragmentProgram._Current) {
 302       /* separate specular color, but no texture */
 303       swrast->SpecTriangle = swrast->Triangle;
 304       swrast->Triangle = _swrast_add_spec_terms_triangle;
 305    }
 306
 307    swrast->Triangle( ctx, v0, v1, v2 );
 308 }
 309
 310 /**
 311  * Called via swrast->Line.  Examine current GL state and choose a software
 312  * line routine.  Then call it.
 313  */
 314 static void
 315 _swrast_validate_line( GLcontext *ctx, const SWvertex *v0, const SWvertex *v1 )
 316 {
 317    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 318
 319    _swrast_validate_derived( ctx );
 320    swrast->choose_line( ctx );
 321    ASSERT(swrast->Line);
 322
 323    if (ctx->Texture._EnabledUnits == 0
 324        && NEED_SECONDARY_COLOR(ctx)
 325        && !ctx->FragmentProgram._Current) {
 326       swrast->SpecLine = swrast->Line;
 327       swrast->Line = _swrast_add_spec_terms_line;
 328    }
 329
 330
 331    swrast->Line( ctx, v0, v1 );
 332 }
 333
 334 /**
 335  * Called via swrast->Point.  Examine current GL state and choose a software
 336  * point routine.  Then call it.
 337  */
 338 static void
 339 _swrast_validate_point( GLcontext *ctx, const SWvertex *v0 )
 340 {
 341    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 342
 343    _swrast_validate_derived( ctx );
 344    swrast->choose_point( ctx );
 345
 346    if (ctx->Texture._EnabledUnits == 0
 347        && NEED_SECONDARY_COLOR(ctx)
 348        && !ctx->FragmentProgram._Current) {
 349       swrast->SpecPoint = swrast->Point;
 350       swrast->Point = _swrast_add_spec_terms_point;
 351    }
 352
 353    swrast->Point( ctx, v0 );
 354 }
 355
 356
 357 /**
 358  * Called via swrast->BlendFunc.  Examine GL state to choose a blending
 359  * function, then call it.
 360  */
 361 static void _ASMAPI
 362 _swrast_validate_blend_func(GLcontext *ctx, GLuint n, const GLubyte mask[],
 363                             GLvoid *src, const GLvoid *dst,
 364                             GLenum chanType )
 365 {
 366    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 367
 368    _swrast_validate_derived( ctx ); /* why is this needed? */
 369    _swrast_choose_blend_func( ctx, chanType );
 370
 371    swrast->BlendFunc( ctx, n, mask, src, dst, chanType );
 372 }
 373
 374
 375 /**
 376  * Make sure we have texture image data for all the textures we may need
 377  * for subsequent rendering.
 378  */
 379 static void
 380 _swrast_validate_texture_images(GLcontext *ctx)
 381 {
 382    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 383    GLuint u;
 384
 385    if (!swrast->ValidateTextureImage || !ctx->Texture._EnabledUnits) {
 386       /* no textures enabled, or no way to validate images! */
 387       return;
 388    }
 389
 390    for (u = 0; u < ctx->Const.MaxTextureImageUnits; u++) {
 391       if (ctx->Texture.Unit[u]._ReallyEnabled) {
 392          struct gl_texture_object *texObj = ctx->Texture.Unit[u]._Current;
 393          ASSERT(texObj);
 394          if (texObj) {
 395             GLuint numFaces = (texObj->Target == GL_TEXTURE_CUBE_MAP) ? 6 : 1;
 396             GLuint face;
 397             for (face = 0; face < numFaces; face++) {
 398                GLuint lvl;
 399                for (lvl = texObj->BaseLevel; lvl <= texObj->_MaxLevel; lvl++) {
 400                   struct gl_texture_image *texImg = texObj->Image[face][lvl];
 401                   if (texImg && !texImg->Data) {
 402                      swrast->ValidateTextureImage(ctx, texObj, face, lvl);
 403                      ASSERT(texObj->Image[face][lvl]->Data);
 404                   }
 405                }
 406             }
 407          }
 408       }
 409    }
 410 }
 411
 412
 413 /**
 414  * Free the texture image data attached to all currently enabled
 415  * textures.  Meant to be called by device drivers when transitioning
 416  * from software to hardware rendering.
 417  */
 418 void
 419 _swrast_eject_texture_images(GLcontext *ctx)
 420 {
 421    GLuint u;
 422
 423    if (!ctx->Texture._EnabledUnits) {
 424       /* no textures enabled */
 425       return;
 426    }
 427
 428    for (u = 0; u < ctx->Const.MaxTextureImageUnits; u++) {
 429       if (ctx->Texture.Unit[u]._ReallyEnabled) {
 430          struct gl_texture_object *texObj = ctx->Texture.Unit[u]._Current;
 431          ASSERT(texObj);
 432          if (texObj) {
 433             GLuint numFaces = (texObj->Target == GL_TEXTURE_CUBE_MAP) ? 6 : 1;
 434             GLuint face;
 435             for (face = 0; face < numFaces; face++) {
 436                GLuint lvl;
 437                for (lvl = texObj->BaseLevel; lvl <= texObj->_MaxLevel; lvl++) {
 438                   struct gl_texture_image *texImg = texObj->Image[face][lvl];
 439                   if (texImg && texImg->Data) {
 440                      _mesa_free_texmemory(texImg->Data);
 441                      texImg->Data = NULL;
 442                   }
 443                }
 444             }
 445          }
 446       }
 447    }
 448 }
 449
 450
 451
 452 static void
 453 _swrast_sleep( GLcontext *ctx, GLbitfield new_state )
 454 {
 455    (void) ctx; (void) new_state;
 456 }
 457
 458
 459 static void
 460 _swrast_invalidate_state( GLcontext *ctx, GLbitfield new_state )
 461 {
 462    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 463    GLuint i;
 464
 465    swrast->NewState |= new_state;
 466
 467    /* After 10 statechanges without any swrast functions being called,
 468     * put the module to sleep.
 469     */
 470    if (++swrast->StateChanges > 10) {
 471       swrast->InvalidateState = _swrast_sleep;
 472       swrast->NewState = ~0;
 473       new_state = ~0;
 474    }
 475
 476    if (new_state & swrast->InvalidateTriangleMask)
 477       swrast->Triangle = _swrast_validate_triangle;
 478
 479    if (new_state & swrast->InvalidateLineMask)
 480       swrast->Line = _swrast_validate_line;
 481
 482    if (new_state & swrast->InvalidatePointMask)
 483       swrast->Point = _swrast_validate_point;
 484
 485    if (new_state & _SWRAST_NEW_BLEND_FUNC)
 486       swrast->BlendFunc = _swrast_validate_blend_func;
 487
 488    if (new_state & _SWRAST_NEW_TEXTURE_SAMPLE_FUNC)
 489       for (i = 0 ; i < ctx->Const.MaxTextureImageUnits ; i++)
 490          swrast->TextureSample[i] = NULL;
 491 }
 492
 493
 494 static void
 495 _swrast_update_texture_samplers(GLcontext *ctx)
 496 {
 497    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 498    GLuint u;
 499
 500    for (u = 0; u < ctx->Const.MaxTextureImageUnits; u++) {
 501       const struct gl_texture_object *tObj = ctx->Texture.Unit[u]._Current;
 502       /* Note: If tObj is NULL, the sample function will be a simple
 503        * function that just returns opaque black (0,0,0,1).
 504        */
 505       swrast->TextureSample[u] = _swrast_choose_texture_sample_func(ctx, tObj);
 506    }
 507 }
 508
 509
 510 void
 511 _swrast_validate_derived( GLcontext *ctx )
 512 {
 513    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 514
 515    if (swrast->NewState) {
 516       if (swrast->NewState & _NEW_POLYGON)
 517          _swrast_update_polygon( ctx );
 518
 519       if (swrast->NewState & (_NEW_HINT | _NEW_PROGRAM))
 520          _swrast_update_fog_hint( ctx );
 521
 522       if (swrast->NewState & _SWRAST_NEW_TEXTURE_ENV_MODE)
 523          _swrast_update_texture_env( ctx );
 524
 525       if (swrast->NewState & (_NEW_FOG | _NEW_PROGRAM))
 526          _swrast_update_fog_state( ctx );
 527
 528       if (swrast->NewState & (_NEW_MODELVIEW |
 529                               _NEW_PROJECTION |
 530                               _NEW_TEXTURE_MATRIX |
 531                               _NEW_FOG |
 532                               _NEW_LIGHT |
 533                               _NEW_LINE |
 534                               _NEW_TEXTURE |
 535                               _NEW_TRANSFORM |
 536                               _NEW_POINT |
 537                               _NEW_VIEWPORT |
 538                               _NEW_PROGRAM))
 539          _swrast_update_fragment_program( ctx, swrast->NewState );
 540
 541       if (swrast->NewState & _NEW_TEXTURE)
 542          _swrast_update_texture_samplers( ctx );
 543
 544       if (swrast->NewState & (_NEW_TEXTURE | _NEW_PROGRAM))
 545          _swrast_validate_texture_images( ctx );
 546
 547       if (swrast->NewState & _SWRAST_NEW_RASTERMASK)
 548          _swrast_update_rasterflags( ctx );
 549
 550       swrast->NewState = 0;
 551       swrast->StateChanges = 0;
 552       swrast->InvalidateState = _swrast_invalidate_state;
 553    }
 554 }
 555
 556 #define SWRAST_DEBUG 0
 557
 558 /* Public entrypoints:  See also s_accum.c, s_bitmap.c, etc.
 559  */
 560 void
 561 _swrast_Quad( GLcontext *ctx,
 562               const SWvertex *v0, const SWvertex *v1,
 563               const SWvertex *v2, const SWvertex *v3 )
 564 {
 565    if (SWRAST_DEBUG) {
 566       _mesa_debug(ctx, "_swrast_Quad\n");
 567       _swrast_print_vertex( ctx, v0 );
 568       _swrast_print_vertex( ctx, v1 );
 569       _swrast_print_vertex( ctx, v2 );
 570       _swrast_print_vertex( ctx, v3 );
 571    }
 572    SWRAST_CONTEXT(ctx)->Triangle( ctx, v0, v1, v3 );
 573    SWRAST_CONTEXT(ctx)->Triangle( ctx, v1, v2, v3 );
 574 }
 575
 576 void
 577 _swrast_Triangle( GLcontext *ctx, const SWvertex *v0,
 578                   const SWvertex *v1, const SWvertex *v2 )
 579 {
 580    if (SWRAST_DEBUG) {
 581       _mesa_debug(ctx, "_swrast_Triangle\n");
 582       _swrast_print_vertex( ctx, v0 );
 583       _swrast_print_vertex( ctx, v1 );
 584       _swrast_print_vertex( ctx, v2 );
 585    }
 586    SWRAST_CONTEXT(ctx)->Triangle( ctx, v0, v1, v2 );
 587 }
 588
 589 void
 590 _swrast_Line( GLcontext *ctx, const SWvertex *v0, const SWvertex *v1 )
 591 {
 592    if (SWRAST_DEBUG) {
 593       _mesa_debug(ctx, "_swrast_Line\n");
 594       _swrast_print_vertex( ctx, v0 );
 595       _swrast_print_vertex( ctx, v1 );
 596    }
 597    SWRAST_CONTEXT(ctx)->Line( ctx, v0, v1 );
 598 }
 599
 600 void
 601 _swrast_Point( GLcontext *ctx, const SWvertex *v0 )
 602 {
 603    if (SWRAST_DEBUG) {
 604       _mesa_debug(ctx, "_swrast_Point\n");
 605       _swrast_print_vertex( ctx, v0 );
 606    }
 607    SWRAST_CONTEXT(ctx)->Point( ctx, v0 );
 608 }
 609
 610 void
 611 _swrast_InvalidateState( GLcontext *ctx, GLbitfield new_state )
 612 {
 613    if (SWRAST_DEBUG) {
 614       _mesa_debug(ctx, "_swrast_InvalidateState\n");
 615    }
 616    SWRAST_CONTEXT(ctx)->InvalidateState( ctx, new_state );
 617 }
 618
 619 void
 620 _swrast_ResetLineStipple( GLcontext *ctx )
 621 {
 622    if (SWRAST_DEBUG) {
 623       _mesa_debug(ctx, "_swrast_ResetLineStipple\n");
 624    }
 625    SWRAST_CONTEXT(ctx)->StippleCounter = 0;
 626 }
 627
 628 void
 629 _swrast_allow_vertex_fog( GLcontext *ctx, GLboolean value )
 630 {
 631    if (SWRAST_DEBUG) {
 632       _mesa_debug(ctx, "_swrast_allow_vertex_fog %d\n", value);
 633    }
 634    SWRAST_CONTEXT(ctx)->InvalidateState( ctx, _NEW_HINT );
 635    SWRAST_CONTEXT(ctx)->AllowVertexFog = value;
 636 }
 637
 638 void
 639 _swrast_allow_pixel_fog( GLcontext *ctx, GLboolean value )
 640 {
 641    if (SWRAST_DEBUG) {
 642       _mesa_debug(ctx, "_swrast_allow_pixel_fog %d\n", value);
 643    }
 644    SWRAST_CONTEXT(ctx)->InvalidateState( ctx, _NEW_HINT );
 645    SWRAST_CONTEXT(ctx)->AllowPixelFog = value;
 646 }
 647
 648
 649 GLboolean
 650 _swrast_CreateContext( GLcontext *ctx )
 651 {
 652    GLuint i;
 653    SWcontext *swrast = (SWcontext *)CALLOC(sizeof(SWcontext));
 654
 655    if (SWRAST_DEBUG) {
 656       _mesa_debug(ctx, "_swrast_CreateContext\n");
 657    }
 658
 659    if (!swrast)
 660       return GL_FALSE;
 661
 662    swrast->NewState = ~0;
 663
 664    swrast->choose_point = _swrast_choose_point;
 665    swrast->choose_line = _swrast_choose_line;
 666    swrast->choose_triangle = _swrast_choose_triangle;
 667
 668    swrast->InvalidatePointMask = _SWRAST_NEW_POINT;
 669    swrast->InvalidateLineMask = _SWRAST_NEW_LINE;
 670    swrast->InvalidateTriangleMask = _SWRAST_NEW_TRIANGLE;
 671
 672    swrast->Point = _swrast_validate_point;
 673    swrast->Line = _swrast_validate_line;
 674    swrast->Triangle = _swrast_validate_triangle;
 675    swrast->InvalidateState = _swrast_sleep;
 676    swrast->BlendFunc = _swrast_validate_blend_func;
 677
 678    swrast->AllowVertexFog = GL_TRUE;
 679    swrast->AllowPixelFog = GL_TRUE;
 680
 681    /* Optimized Accum buffer */
 682    swrast->_IntegerAccumMode = GL_FALSE;
 683    swrast->_IntegerAccumScaler = 0.0;
 684
 685    for (i = 0; i < MAX_TEXTURE_IMAGE_UNITS; i++)
 686       swrast->TextureSample[i] = NULL;
 687
 688    swrast->SpanArrays = MALLOC_STRUCT(sw_span_arrays);
 689    if (!swrast->SpanArrays) {
 690       FREE(swrast);
 691       return GL_FALSE;
 692    }
 693    swrast->SpanArrays->ChanType = CHAN_TYPE;
 694 #if CHAN_TYPE == GL_UNSIGNED_BYTE
 695    swrast->SpanArrays->rgba = swrast->SpanArrays->color.sz1.rgba;
 696    swrast->SpanArrays->spec = swrast->SpanArrays->color.sz1.spec;
 697 #elif CHAN_TYPE == GL_UNSIGNED_SHORT
 698    swrast->SpanArrays->rgba = swrast->SpanArrays->color.sz2.rgba;
 699    swrast->SpanArrays->spec = swrast->SpanArrays->color.sz2.spec;
 700 #else
 701    swrast->SpanArrays->rgba = swrast->SpanArrays->color.sz4.rgba;
 702    swrast->SpanArrays->spec = swrast->SpanArrays->color.sz4.spec;
 703 #endif
 704
 705    /* init point span buffer */
 706    swrast->PointSpan.primitive = GL_POINT;
 707    swrast->PointSpan.end = 0;
 708    swrast->PointSpan.facing = 0;
 709    swrast->PointSpan.array = swrast->SpanArrays;
 710
 711    swrast->TexelBuffer = (GLchan *) MALLOC(ctx->Const.MaxTextureImageUnits *
 712                                            MAX_WIDTH * 4 * sizeof(GLchan));
 713    if (!swrast->TexelBuffer) {
 714       FREE(swrast->SpanArrays);
 715       FREE(swrast);
 716       return GL_FALSE;
 717    }
 718
 719    ctx->swrast_context = swrast;
 720
 721    return GL_TRUE;
 722 }
 723
 724 void
 725 _swrast_DestroyContext( GLcontext *ctx )
 726 {
 727    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 728
 729    if (SWRAST_DEBUG) {
 730       _mesa_debug(ctx, "_swrast_DestroyContext\n");
 731    }
 732
 733    FREE( swrast->SpanArrays );
 734    FREE( swrast->TexelBuffer );
 735    FREE( swrast );
 736
 737    ctx->swrast_context = 0;
 738 }
 739
 740
 741 struct swrast_device_driver *
 742 _swrast_GetDeviceDriverReference( GLcontext *ctx )
 743 {
 744    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 745    return &swrast->Driver;
 746 }
 747
 748 void
 749 _swrast_flush( GLcontext *ctx )
 750 {
 751    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 752    /* flush any pending fragments from rendering points */
 753    if (swrast->PointSpan.end > 0) {
 754       if (ctx->Visual.rgbMode) {
 755          _swrast_write_rgba_span(ctx, &(swrast->PointSpan));
 756       }
 757       else {
 758          _swrast_write_index_span(ctx, &(swrast->PointSpan));
 759       }
 760       swrast->PointSpan.end = 0;
 761    }
 762 }
 763
 764 void
 765 _swrast_render_primitive( GLcontext *ctx, GLenum prim )
 766 {
 767    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 768    if (swrast->Primitive == GL_POINTS && prim != GL_POINTS) {
 769       _swrast_flush(ctx);
 770    }
 771    swrast->Primitive = prim;
 772 }
 773
 774
 775 void
 776 _swrast_render_start( GLcontext *ctx )
 777 {
 778    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 779    if (swrast->Driver.SpanRenderStart)
 780       swrast->Driver.SpanRenderStart( ctx );
 781    swrast->PointSpan.end = 0;
 782 }
 783
 784 void
 785 _swrast_render_finish( GLcontext *ctx )
 786 {
 787    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 788    if (swrast->Driver.SpanRenderFinish)
 789       swrast->Driver.SpanRenderFinish( ctx );
 790
 791    _swrast_flush(ctx);
 792 }
 793
 794
 795 #define SWRAST_DEBUG_VERTICES 0
 796
 797 void
 798 _swrast_print_vertex( GLcontext *ctx, const SWvertex *v )
 799 {
 800    GLuint i;
 801
 802    if (SWRAST_DEBUG_VERTICES) {
 803       _mesa_debug(ctx, "win %f %f %f %f\n",
 804                   v->win[0], v->win[1], v->win[2], v->win[3]);
 805
 806       for (i = 0 ; i < ctx->Const.MaxTextureCoordUnits ; i++)
 807          if (ctx->Texture.Unit[i]._ReallyEnabled)
 808             _mesa_debug(ctx, "texcoord[%d] %f %f %f %f\n", i,
 809                         v->texcoord[i][0], v->texcoord[i][1],
 810                         v->texcoord[i][2], v->texcoord[i][3]);
 811
 812 #if CHAN_TYPE == GL_FLOAT
 813       _mesa_debug(ctx, "color %f %f %f %f\n",
 814                   v->color[0], v->color[1], v->color[2], v->color[3]);
 815       _mesa_debug(ctx, "spec %f %f %f %f\n",
 816                   v->specular[0], v->specular[1],
 817                   v->specular[2], v->specular[3]);
 818 #else
 819       _mesa_debug(ctx, "color %d %d %d %d\n",
 820                   v->color[0], v->color[1], v->color[2], v->color[3]);
 821       _mesa_debug(ctx, "spec %d %d %d %d\n",
 822                   v->specular[0], v->specular[1],
 823                   v->specular[2], v->specular[3]);
 824 #endif
 825       _mesa_debug(ctx, "fog %f\n", v->fog);
 826       _mesa_debug(ctx, "index %d\n", v->index);
 827       _mesa_debug(ctx, "pointsize %f\n", v->pointSize);
 828       _mesa_debug(ctx, "\n");
 829    }
 830 }