src/mesa/swrast/s_context.c

   1 /* $Id: s_context.c,v 1.41 2002/10/24 23:57:24 brianp Exp $ */
   2
   3 /*
   4  * Mesa 3-D graphics library
   5  * Version:  4.1
   6  *
   7  * Copyright (C) 1999-2002  Brian Paul   All Rights Reserved.
   8  *
   9  * Permission is hereby granted, free of charge, to any person obtaining a
  10  * copy of this software and associated documentation files (the "Software"),
  11  * to deal in the Software without restriction, including without limitation
  12  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
  13  * and/or sell copies of the Software, and to permit persons to whom the
  14  * Software is furnished to do so, subject to the following conditions:
  15  *
  16  * The above copyright notice and this permission notice shall be included
  17  * in all copies or substantial portions of the Software.
  18  *
  19  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  20  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  21  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  22  * BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
  23  * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  24  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  25  *
  26  * Authors:
  27  *    Keith Whitwell <keithw@valinux.com>
  28  */
  29
  30 #include "glheader.h"
  31 #include "context.h"
  32 #include "mtypes.h"
  33 #include "imports.h"
  34
  35 #include "swrast.h"
  36 #include "s_blend.h"
  37 #include "s_context.h"
  38 #include "s_lines.h"
  39 #include "s_points.h"
  40 #include "s_span.h"
  41 #include "s_triangle.h"
  42 #include "s_texture.h"
  43
  44
  45 /*
  46  * Recompute the value of swrast->_RasterMask, etc. according to
  47  * the current context.
  48  */
  49 static void
  50 _swrast_update_rasterflags( GLcontext *ctx )
  51 {
  52    GLuint RasterMask = 0;
  53
  54    if (ctx->Color.AlphaEnabled)           RasterMask |= ALPHATEST_BIT;
  55    if (ctx->Color.BlendEnabled)           RasterMask |= BLEND_BIT;
  56    if (ctx->Depth.Test)                   RasterMask |= DEPTH_BIT;
  57    if (ctx->Fog.Enabled)                  RasterMask |= FOG_BIT;
  58    if (ctx->Scissor.Enabled)              RasterMask |= CLIP_BIT;
  59    if (ctx->Stencil.Enabled)              RasterMask |= STENCIL_BIT;
  60    if (ctx->Visual.rgbMode) {
  61       const GLuint colorMask = *((GLuint *) &ctx->Color.ColorMask);
  62       if (colorMask != 0xffffffff)        RasterMask |= MASKING_BIT;
  63       if (ctx->Color.ColorLogicOpEnabled) RasterMask |= LOGIC_OP_BIT;
  64       if (ctx->Texture._EnabledUnits)     RasterMask |= TEXTURE_BIT;
  65    }
  66    else {
  67       if (ctx->Color.IndexMask != 0xffffffff) RasterMask |= MASKING_BIT;
  68       if (ctx->Color.IndexLogicOpEnabled)     RasterMask |= LOGIC_OP_BIT;
  69    }
  70
  71    if (ctx->DrawBuffer->UseSoftwareAlphaBuffers
  72        && ctx->Color.ColorMask[ACOMP]
  73        && ctx->Color.DrawBuffer != GL_NONE)
  74       RasterMask |= ALPHABUF_BIT;
  75
  76    if (   ctx->Viewport.X < 0
  77        || ctx->Viewport.X + ctx->Viewport.Width > (GLint) ctx->DrawBuffer->Width
  78        || ctx->Viewport.Y < 0
  79        || ctx->Viewport.Y + ctx->Viewport.Height > (GLint) ctx->DrawBuffer->Height) {
  80       RasterMask |= CLIP_BIT;
  81    }
  82
  83    if (ctx->Depth.OcclusionTest)
  84       RasterMask |= OCCLUSION_BIT;
  85
  86
  87    /* If we're not drawing to exactly one color buffer set the
  88     * MULTI_DRAW_BIT flag.  Also set it if we're drawing to no
  89     * buffers or the RGBA or CI mask disables all writes.
  90     */
  91    if (ctx->Color._DrawDestMask != FRONT_LEFT_BIT &&
  92        ctx->Color._DrawDestMask != BACK_LEFT_BIT &&
  93        ctx->Color._DrawDestMask != FRONT_RIGHT_BIT &&
  94        ctx->Color._DrawDestMask != BACK_RIGHT_BIT) {
  95       /* more than one color buffer designated for writing (or zero buffers) */
  96       RasterMask |= MULTI_DRAW_BIT;
  97    }
  98    else if (ctx->Visual.rgbMode && *((GLuint *) ctx->Color.ColorMask) == 0) {
  99       RasterMask |= MULTI_DRAW_BIT; /* all RGBA channels disabled */
 100    }
 101    else if (!ctx->Visual.rgbMode && ctx->Color.IndexMask==0) {
 102       RasterMask |= MULTI_DRAW_BIT; /* all color index bits disabled */
 103    }
 104
 105    SWRAST_CONTEXT(ctx)->_RasterMask = RasterMask;
 106 }
 107
 108
 109 static void
 110 _swrast_update_polygon( GLcontext *ctx )
 111 {
 112    GLfloat backface_sign = 1;
 113
 114    if (ctx->Polygon.CullFlag) {
 115       backface_sign = 1;
 116       switch(ctx->Polygon.CullFaceMode) {
 117       case GL_BACK:
 118          if(ctx->Polygon.FrontFace==GL_CCW)
 119             backface_sign = -1;
 120          break;
 121       case GL_FRONT:
 122          if(ctx->Polygon.FrontFace!=GL_CCW)
 123             backface_sign = -1;
 124          break;
 125       default:
 126       case GL_FRONT_AND_BACK:
 127          backface_sign = 0;
 128          break;
 129       }
 130    }
 131    else {
 132       backface_sign = 0;
 133    }
 134
 135    SWRAST_CONTEXT(ctx)->_backface_sign = backface_sign;
 136 }
 137
 138
 139 static void
 140 _swrast_update_hint( GLcontext *ctx )
 141 {
 142    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 143    swrast->_PreferPixelFog = (!swrast->AllowVertexFog ||
 144                               (ctx->Hint.Fog == GL_NICEST &&
 145                                swrast->AllowPixelFog));
 146 }
 147
 148
 149 /*
 150  * Update the swrast->_AnyTextureCombine flag.
 151  */
 152 static void
 153 _swrast_update_texture_env( GLcontext *ctx )
 154 {
 155    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 156    GLuint i;
 157    swrast->_AnyTextureCombine = GL_FALSE;
 158    for (i = 0; i < ctx->Const.MaxTextureUnits; i++) {
 159       if (ctx->Texture.Unit[i].EnvMode == GL_COMBINE_EXT ||
 160           ctx->Texture.Unit[i].EnvMode == GL_COMBINE4_NV) {
 161          swrast->_AnyTextureCombine = GL_TRUE;
 162          return;
 163       }
 164    }
 165 }
 166
 167
 168 #define _SWRAST_NEW_DERIVED (_SWRAST_NEW_RASTERMASK |   \
 169                              _NEW_TEXTURE |             \
 170                              _NEW_HINT |                \
 171                              _NEW_POLYGON )
 172
 173 /* State referenced by _swrast_choose_triangle, _swrast_choose_line.
 174  */
 175 #define _SWRAST_NEW_TRIANGLE (_SWRAST_NEW_DERIVED |             \
 176                               _NEW_RENDERMODE|                  \
 177                               _NEW_POLYGON|                     \
 178                               _NEW_DEPTH|                       \
 179                               _NEW_STENCIL|                     \
 180                               _NEW_COLOR|                       \
 181                               _NEW_TEXTURE|                     \
 182                               _SWRAST_NEW_RASTERMASK|           \
 183                               _NEW_LIGHT|                       \
 184                               _NEW_FOG |                        \
 185                               _DD_NEW_SEPARATE_SPECULAR)
 186
 187 #define _SWRAST_NEW_LINE (_SWRAST_NEW_DERIVED |         \
 188                           _NEW_RENDERMODE|              \
 189                           _NEW_LINE|                    \
 190                           _NEW_TEXTURE|                 \
 191                           _NEW_LIGHT|                   \
 192                           _NEW_FOG|                     \
 193                           _NEW_DEPTH |                  \
 194                           _DD_NEW_SEPARATE_SPECULAR)
 195
 196 #define _SWRAST_NEW_POINT (_SWRAST_NEW_DERIVED |        \
 197                            _NEW_RENDERMODE |            \
 198                            _NEW_POINT |                 \
 199                            _NEW_TEXTURE |               \
 200                            _NEW_LIGHT |                 \
 201                            _NEW_FOG |                   \
 202                            _DD_NEW_SEPARATE_SPECULAR)
 203
 204 #define _SWRAST_NEW_TEXTURE_SAMPLE_FUNC _NEW_TEXTURE
 205
 206 #define _SWRAST_NEW_TEXTURE_ENV_MODE _NEW_TEXTURE
 207
 208 #define _SWRAST_NEW_BLEND_FUNC _NEW_COLOR
 209
 210
 211
 212 /* Stub for swrast->Triangle to select a true triangle function
 213  * after a state change.
 214  */
 215 static void
 216 _swrast_validate_triangle( GLcontext *ctx,
 217                            const SWvertex *v0,
 218                            const SWvertex *v1,
 219                            const SWvertex *v2 )
 220 {
 221    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 222
 223    _swrast_validate_derived( ctx );
 224    swrast->choose_triangle( ctx );
 225
 226    if ((ctx->_TriangleCaps & DD_SEPARATE_SPECULAR) &&
 227        ctx->Texture._EnabledUnits == 0) {
 228       swrast->SpecTriangle = swrast->Triangle;
 229       swrast->Triangle = _swrast_add_spec_terms_triangle;
 230    }
 231
 232    swrast->Triangle( ctx, v0, v1, v2 );
 233 }
 234
 235 static void
 236 _swrast_validate_line( GLcontext *ctx, const SWvertex *v0, const SWvertex *v1 )
 237 {
 238    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 239
 240    _swrast_validate_derived( ctx );
 241    swrast->choose_line( ctx );
 242
 243    if ((ctx->_TriangleCaps & DD_SEPARATE_SPECULAR) &&
 244        ctx->Texture._EnabledUnits == 0) {
 245       swrast->SpecLine = swrast->Line;
 246       swrast->Line = _swrast_add_spec_terms_line;
 247    }
 248
 249
 250    swrast->Line( ctx, v0, v1 );
 251 }
 252
 253 static void
 254 _swrast_validate_point( GLcontext *ctx, const SWvertex *v0 )
 255 {
 256    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 257
 258    _swrast_validate_derived( ctx );
 259    swrast->choose_point( ctx );
 260
 261    if ((ctx->_TriangleCaps & DD_SEPARATE_SPECULAR) &&
 262        ctx->Texture._EnabledUnits == 0) {
 263       swrast->SpecPoint = swrast->Point;
 264       swrast->Point = _swrast_add_spec_terms_point;
 265    }
 266
 267    swrast->Point( ctx, v0 );
 268 }
 269
 270 static void
 271 _swrast_validate_blend_func( GLcontext *ctx, GLuint n,
 272                              const GLubyte mask[],
 273                              GLchan src[][4],
 274                              CONST GLchan dst[][4] )
 275 {
 276    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 277
 278    _swrast_validate_derived( ctx );
 279    _swrast_choose_blend_func( ctx );
 280
 281    swrast->BlendFunc( ctx, n, mask, src, dst );
 282 }
 283
 284
 285 static void
 286 _swrast_validate_texture_sample( GLcontext *ctx, GLuint texUnit,
 287                                  const struct gl_texture_object *tObj,
 288                                  GLuint n, GLfloat texcoords[][4],
 289                                  const GLfloat lambda[], GLchan rgba[][4] )
 290 {
 291    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 292
 293    _swrast_validate_derived( ctx );
 294    _swrast_choose_texture_sample_func( ctx, texUnit, tObj );
 295
 296    swrast->TextureSample[texUnit]( ctx, texUnit, tObj, n, texcoords,
 297                                    lambda, rgba );
 298 }
 299
 300
 301 static void
 302 _swrast_sleep( GLcontext *ctx, GLuint new_state )
 303 {
 304 }
 305
 306
 307 static void
 308 _swrast_invalidate_state( GLcontext *ctx, GLuint new_state )
 309 {
 310    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 311    GLuint i;
 312
 313    swrast->NewState |= new_state;
 314
 315    /* After 10 statechanges without any swrast functions being called,
 316     * put the module to sleep.
 317     */
 318    if (++swrast->StateChanges > 10) {
 319       swrast->InvalidateState = _swrast_sleep;
 320       swrast->NewState = ~0;
 321       new_state = ~0;
 322    }
 323
 324    if (new_state & swrast->invalidate_triangle)
 325       swrast->Triangle = _swrast_validate_triangle;
 326
 327    if (new_state & swrast->invalidate_line)
 328       swrast->Line = _swrast_validate_line;
 329
 330    if (new_state & swrast->invalidate_point)
 331       swrast->Point = _swrast_validate_point;
 332
 333    if (new_state & _SWRAST_NEW_BLEND_FUNC)
 334       swrast->BlendFunc = _swrast_validate_blend_func;
 335
 336    if (new_state & _SWRAST_NEW_TEXTURE_SAMPLE_FUNC)
 337       for (i = 0 ; i < ctx->Const.MaxTextureUnits ; i++)
 338          swrast->TextureSample[i] = _swrast_validate_texture_sample;
 339
 340    if (ctx->Visual.rgbMode) {
 341       ASSERT(swrast->Driver.WriteRGBASpan);
 342       ASSERT(swrast->Driver.WriteRGBSpan);
 343       ASSERT(swrast->Driver.WriteMonoRGBASpan);
 344       ASSERT(swrast->Driver.WriteRGBAPixels);
 345       ASSERT(swrast->Driver.WriteMonoRGBAPixels);
 346       ASSERT(swrast->Driver.ReadRGBASpan);
 347       ASSERT(swrast->Driver.ReadRGBAPixels);
 348    }
 349    else {
 350       ASSERT(swrast->Driver.WriteCI32Span);
 351       ASSERT(swrast->Driver.WriteCI8Span);
 352       ASSERT(swrast->Driver.WriteMonoCISpan);
 353       ASSERT(swrast->Driver.WriteCI32Pixels);
 354       ASSERT(swrast->Driver.WriteMonoCIPixels);
 355       ASSERT(swrast->Driver.ReadCI32Span);
 356       ASSERT(swrast->Driver.ReadCI32Pixels);
 357    }
 358 }
 359
 360
 361 void
 362 _swrast_validate_derived( GLcontext *ctx )
 363 {
 364    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 365
 366    if (swrast->NewState) {
 367       if (swrast->NewState & _SWRAST_NEW_RASTERMASK)
 368          _swrast_update_rasterflags( ctx );
 369
 370       if (swrast->NewState & _NEW_POLYGON)
 371          _swrast_update_polygon( ctx );
 372
 373       if (swrast->NewState & _NEW_HINT)
 374          _swrast_update_hint( ctx );
 375
 376       if (swrast->NewState & _SWRAST_NEW_TEXTURE_ENV_MODE)
 377          _swrast_update_texture_env( ctx );
 378
 379       swrast->NewState = 0;
 380       swrast->StateChanges = 0;
 381       swrast->InvalidateState = _swrast_invalidate_state;
 382    }
 383 }
 384
 385 #define SWRAST_DEBUG 0
 386
 387 /* Public entrypoints:  See also s_accum.c, s_bitmap.c, etc.
 388  */
 389 void
 390 _swrast_Quad( GLcontext *ctx,
 391               const SWvertex *v0, const SWvertex *v1,
 392               const SWvertex *v2, const SWvertex *v3 )
 393 {
 394    if (SWRAST_DEBUG) {
 395       _mesa_debug(ctx, "_swrast_Quad\n");
 396       _swrast_print_vertex( ctx, v0 );
 397       _swrast_print_vertex( ctx, v1 );
 398       _swrast_print_vertex( ctx, v2 );
 399       _swrast_print_vertex( ctx, v3 );
 400    }
 401    SWRAST_CONTEXT(ctx)->Triangle( ctx, v0, v1, v3 );
 402    SWRAST_CONTEXT(ctx)->Triangle( ctx, v1, v2, v3 );
 403 }
 404
 405 void
 406 _swrast_Triangle( GLcontext *ctx, const SWvertex *v0,
 407                   const SWvertex *v1, const SWvertex *v2 )
 408 {
 409    if (SWRAST_DEBUG) {
 410       _mesa_debug(ctx, "_swrast_Triangle\n");
 411       _swrast_print_vertex( ctx, v0 );
 412       _swrast_print_vertex( ctx, v1 );
 413       _swrast_print_vertex( ctx, v2 );
 414    }
 415    SWRAST_CONTEXT(ctx)->Triangle( ctx, v0, v1, v2 );
 416 }
 417
 418 void
 419 _swrast_Line( GLcontext *ctx, const SWvertex *v0, const SWvertex *v1 )
 420 {
 421    if (SWRAST_DEBUG) {
 422       _mesa_debug(ctx, "_swrast_Line\n");
 423       _swrast_print_vertex( ctx, v0 );
 424       _swrast_print_vertex( ctx, v1 );
 425    }
 426    SWRAST_CONTEXT(ctx)->Line( ctx, v0, v1 );
 427 }
 428
 429 void
 430 _swrast_Point( GLcontext *ctx, const SWvertex *v0 )
 431 {
 432    if (SWRAST_DEBUG) {
 433       _mesa_debug(ctx, "_swrast_Point\n");
 434       _swrast_print_vertex( ctx, v0 );
 435    }
 436    SWRAST_CONTEXT(ctx)->Point( ctx, v0 );
 437 }
 438
 439 void
 440 _swrast_InvalidateState( GLcontext *ctx, GLuint new_state )
 441 {
 442    if (SWRAST_DEBUG) {
 443       _mesa_debug(ctx, "_swrast_InvalidateState\n");
 444    }
 445    SWRAST_CONTEXT(ctx)->InvalidateState( ctx, new_state );
 446 }
 447
 448 void
 449 _swrast_ResetLineStipple( GLcontext *ctx )
 450 {
 451    if (SWRAST_DEBUG) {
 452       _mesa_debug(ctx, "_swrast_ResetLineStipple\n");
 453    }
 454    SWRAST_CONTEXT(ctx)->StippleCounter = 0;
 455 }
 456
 457 void
 458 _swrast_allow_vertex_fog( GLcontext *ctx, GLboolean value )
 459 {
 460    if (SWRAST_DEBUG) {
 461       _mesa_debug(ctx, "_swrast_allow_vertex_fog %d\n", value);
 462    }
 463    SWRAST_CONTEXT(ctx)->InvalidateState( ctx, _NEW_HINT );
 464    SWRAST_CONTEXT(ctx)->AllowVertexFog = value;
 465 }
 466
 467 void
 468 _swrast_allow_pixel_fog( GLcontext *ctx, GLboolean value )
 469 {
 470    if (SWRAST_DEBUG) {
 471       _mesa_debug(ctx, "_swrast_allow_pixel_fog %d\n", value);
 472    }
 473    SWRAST_CONTEXT(ctx)->InvalidateState( ctx, _NEW_HINT );
 474    SWRAST_CONTEXT(ctx)->AllowPixelFog = value;
 475 }
 476
 477
 478 GLboolean
 479 _swrast_CreateContext( GLcontext *ctx )
 480 {
 481    GLuint i;
 482    SWcontext *swrast = (SWcontext *)CALLOC(sizeof(SWcontext));
 483
 484    if (SWRAST_DEBUG) {
 485       _mesa_debug(ctx, "_swrast_CreateContext\n");
 486    }
 487
 488    if (!swrast)
 489       return GL_FALSE;
 490
 491    swrast->NewState = ~0;
 492
 493    swrast->choose_point = _swrast_choose_point;
 494    swrast->choose_line = _swrast_choose_line;
 495    swrast->choose_triangle = _swrast_choose_triangle;
 496
 497    swrast->invalidate_point = _SWRAST_NEW_POINT;
 498    swrast->invalidate_line = _SWRAST_NEW_LINE;
 499    swrast->invalidate_triangle = _SWRAST_NEW_TRIANGLE;
 500
 501    swrast->Point = _swrast_validate_point;
 502    swrast->Line = _swrast_validate_line;
 503    swrast->Triangle = _swrast_validate_triangle;
 504    swrast->InvalidateState = _swrast_sleep;
 505    swrast->BlendFunc = _swrast_validate_blend_func;
 506
 507    swrast->AllowVertexFog = GL_TRUE;
 508    swrast->AllowPixelFog = GL_TRUE;
 509
 510    if (ctx->Visual.doubleBufferMode)
 511       swrast->CurrentBuffer = BACK_LEFT_BIT;
 512    else
 513       swrast->CurrentBuffer = FRONT_LEFT_BIT;
 514
 515    /* Optimized Accum buffer */
 516    swrast->_IntegerAccumMode = GL_TRUE;
 517    swrast->_IntegerAccumScaler = 0.0;
 518
 519    for (i = 0 ; i < MAX_TEXTURE_UNITS ; i++)
 520       swrast->TextureSample[i] = _swrast_validate_texture_sample;
 521
 522    swrast->SpanArrays = MALLOC_STRUCT(span_arrays);
 523    if (!swrast->SpanArrays) {
 524       FREE(swrast);
 525       return GL_FALSE;
 526    }
 527
 528    /* init point span buffer */
 529    swrast->PointSpan.primitive = GL_POINT;
 530    swrast->PointSpan.start = 0;
 531    swrast->PointSpan.end = 0;
 532    swrast->PointSpan.facing = 0;
 533    swrast->PointSpan.array = swrast->SpanArrays;
 534
 535    assert(ctx->Const.MaxTextureUnits > 0);
 536    assert(ctx->Const.MaxTextureUnits <= MAX_TEXTURE_UNITS);
 537
 538    swrast->TexelBuffer = (GLchan *) MALLOC(ctx->Const.MaxTextureUnits *
 539                                            MAX_WIDTH * 4 * sizeof(GLchan));
 540    if (!swrast->TexelBuffer) {
 541       FREE(swrast->SpanArrays);
 542       FREE(swrast);
 543       return GL_FALSE;
 544    }
 545
 546    ctx->swrast_context = swrast;
 547
 548    return GL_TRUE;
 549 }
 550
 551 void
 552 _swrast_DestroyContext( GLcontext *ctx )
 553 {
 554    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 555
 556    if (SWRAST_DEBUG) {
 557       _mesa_debug(ctx, "_swrast_DestroyContext\n");
 558    }
 559
 560    FREE( swrast->SpanArrays );
 561    FREE( swrast->TexelBuffer );
 562    FREE( swrast );
 563
 564    ctx->swrast_context = 0;
 565 }
 566
 567
 568 struct swrast_device_driver *
 569 _swrast_GetDeviceDriverReference( GLcontext *ctx )
 570 {
 571    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 572    return &swrast->Driver;
 573 }
 574
 575 void
 576 _swrast_flush( GLcontext *ctx )
 577 {
 578    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 579    /* flush any pending fragments from rendering points */
 580    if (swrast->PointSpan.end > 0) {
 581       if (ctx->Visual.rgbMode) {
 582          if (ctx->Texture._EnabledUnits)
 583             _mesa_write_texture_span(ctx, &(swrast->PointSpan));
 584          else
 585             _mesa_write_rgba_span(ctx, &(swrast->PointSpan));
 586       }
 587       else {
 588          _mesa_write_index_span(ctx, &(swrast->PointSpan));
 589       }
 590       swrast->PointSpan.end = 0;
 591    }
 592 }
 593
 594 void
 595 _swrast_render_primitive( GLcontext *ctx, GLenum prim )
 596 {
 597    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 598    if (swrast->Primitive == GL_POINTS && prim != GL_POINTS) {
 599       _swrast_flush(ctx);
 600    }
 601    swrast->Primitive = prim;
 602 }
 603
 604
 605 void
 606 _swrast_render_start( GLcontext *ctx )
 607 {
 608    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 609    if (swrast->Driver.SpanRenderStart)
 610       swrast->Driver.SpanRenderStart( ctx );
 611    swrast->PointSpan.end = 0;
 612 }
 613
 614 void
 615 _swrast_render_finish( GLcontext *ctx )
 616 {
 617    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 618    if (swrast->Driver.SpanRenderFinish)
 619       swrast->Driver.SpanRenderFinish( ctx );
 620
 621    _swrast_flush(ctx);
 622 }
 623
 624
 625 #define SWRAST_DEBUG_VERTICES 0
 626
 627 void
 628 _swrast_print_vertex( GLcontext *ctx, const SWvertex *v )
 629 {
 630    GLuint i;
 631
 632    if (SWRAST_DEBUG_VERTICES) {
 633       _mesa_debug(ctx, "win %f %f %f %f\n",
 634                   v->win[0], v->win[1], v->win[2], v->win[3]);
 635
 636       for (i = 0 ; i < ctx->Const.MaxTextureUnits ; i++)
 637          if (ctx->Texture.Unit[i]._ReallyEnabled)
 638             _mesa_debug(ctx, "texcoord[%d] %f %f %f %f\n", i,
 639                         v->texcoord[i][0], v->texcoord[i][1],
 640                         v->texcoord[i][2], v->texcoord[i][3]);
 641
 642 #if CHAN_TYPE == GL_FLOAT
 643       _mesa_debug(ctx, "color %f %f %f %f\n",
 644                   v->color[0], v->color[1], v->color[2], v->color[3]);
 645       _mesa_debug(ctx, "spec %f %f %f %f\n",
 646                   v->specular[0], v->specular[1],
 647                   v->specular[2], v->specular[3]);
 648 #else
 649       _mesa_debug(ctx, "color %d %d %d %d\n",
 650                   v->color[0], v->color[1], v->color[2], v->color[3]);
 651       _mesa_debug(ctx, "spec %d %d %d %d\n",
 652                   v->specular[0], v->specular[1],
 653                   v->specular[2], v->specular[3]);
 654 #endif
 655       _mesa_debug(ctx, "fog %f\n", v->fog);
 656       _mesa_debug(ctx, "index %d\n", v->index);
 657       _mesa_debug(ctx, "pointsize %f\n", v->pointSize);
 658       _mesa_debug(ctx, "\n");
 659    }
 660 }