s_context.c revision f386f73f9e4054a750d453fa2f5449c2f1d2e242 
1/* $Id: s_context.c,v 1.46 2003/03/14 15:41:00 brianp Exp $ */
2
3/*
4 * Mesa 3-D graphics library
5 * Version:  5.1
6 *
7 * Copyright (C) 1999-2003  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 <keith@tungstengraphics.com>
28 *    Brian Paul
29 */
30
31#include "imports.h"
32#include "context.h"
33#include "mtypes.h"
34#include "texobj.h"
35
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_texture.h"
44
45
46/*
47 * Recompute the value of swrast->_RasterMask, etc. according to
48 * the current context.
49 */
50static void
51_swrast_update_rasterflags( GLcontext *ctx )
52{
53   GLuint RasterMask = 0;
54
55   if (ctx->Color.AlphaEnabled)           RasterMask |= ALPHATEST_BIT;
56   if (ctx->Color.BlendEnabled)           RasterMask |= BLEND_BIT;
57   if (ctx->Depth.Test)                   RasterMask |= DEPTH_BIT;
58   if (ctx->Fog.Enabled)                  RasterMask |= FOG_BIT;
59   if (ctx->Scissor.Enabled)              RasterMask |= CLIP_BIT;
60   if (ctx->Stencil.Enabled)              RasterMask |= STENCIL_BIT;
61   if (ctx->Visual.rgbMode) {
62      const GLuint colorMask = *((GLuint *) &ctx->Color.ColorMask);
63      if (colorMask != 0xffffffff)        RasterMask |= MASKING_BIT;
64      if (ctx->Color.ColorLogicOpEnabled) RasterMask |= LOGIC_OP_BIT;
65      if (ctx->Texture._EnabledUnits)     RasterMask |= TEXTURE_BIT;
66   }
67   else {
68      if (ctx->Color.IndexMask != 0xffffffff) RasterMask |= MASKING_BIT;
69      if (ctx->Color.IndexLogicOpEnabled)     RasterMask |= LOGIC_OP_BIT;
70   }
71
72   if (ctx->DrawBuffer->UseSoftwareAlphaBuffers
73       && ctx->Color.ColorMask[ACOMP]
74       && ctx->Color.DrawBuffer != GL_NONE)
75      RasterMask |= ALPHABUF_BIT;
76
77   if (   ctx->Viewport.X < 0
78       || ctx->Viewport.X + ctx->Viewport.Width > (GLint) ctx->DrawBuffer->Width
79       || ctx->Viewport.Y < 0
80       || ctx->Viewport.Y + ctx->Viewport.Height > (GLint) ctx->DrawBuffer->Height) {
81      RasterMask |= CLIP_BIT;
82   }
83
84   if (ctx->Depth.OcclusionTest)
85      RasterMask |= OCCLUSION_BIT;
86
87
88   /* If we're not drawing to exactly one color buffer set the
89    * MULTI_DRAW_BIT flag.  Also set it if we're drawing to no
90    * buffers or the RGBA or CI mask disables all writes.
91    */
92   if (ctx->Color._DrawDestMask != FRONT_LEFT_BIT &&
93       ctx->Color._DrawDestMask != BACK_LEFT_BIT &&
94       ctx->Color._DrawDestMask != FRONT_RIGHT_BIT &&
95       ctx->Color._DrawDestMask != BACK_RIGHT_BIT) {
96      /* more than one color buffer designated for writing (or zero buffers) */
97      RasterMask |= MULTI_DRAW_BIT;
98   }
99   else if (ctx->Visual.rgbMode && *((GLuint *) ctx->Color.ColorMask) == 0) {
100      RasterMask |= MULTI_DRAW_BIT; /* all RGBA channels disabled */
101   }
102   else if (!ctx->Visual.rgbMode && ctx->Color.IndexMask==0) {
103      RasterMask |= MULTI_DRAW_BIT; /* all color index bits disabled */
104   }
105
106   SWRAST_CONTEXT(ctx)->_RasterMask = RasterMask;
107}
108
109
110static void
111_swrast_update_polygon( GLcontext *ctx )
112{
113   GLfloat backface_sign = 1;
114
115   if (ctx->Polygon.CullFlag) {
116      backface_sign = 1;
117      switch(ctx->Polygon.CullFaceMode) {
118      case GL_BACK:
119	 if(ctx->Polygon.FrontFace==GL_CCW)
120	    backface_sign = -1;
121	 break;
122      case GL_FRONT:
123	 if(ctx->Polygon.FrontFace!=GL_CCW)
124	    backface_sign = -1;
125	 break;
126      default:
127      case GL_FRONT_AND_BACK:
128	 backface_sign = 0;
129	 break;
130      }
131   }
132   else {
133      backface_sign = 0;
134   }
135
136   SWRAST_CONTEXT(ctx)->_backface_sign = backface_sign;
137}
138
139
140static void
141_swrast_update_hint( GLcontext *ctx )
142{
143   SWcontext *swrast = SWRAST_CONTEXT(ctx);
144   swrast->_PreferPixelFog = (!swrast->AllowVertexFog ||
145			      (ctx->Hint.Fog == GL_NICEST &&
146			       swrast->AllowPixelFog));
147}
148
149
150/*
151 * Update the swrast->_AnyTextureCombine flag.
152 */
153static void
154_swrast_update_texture_env( GLcontext *ctx )
155{
156   SWcontext *swrast = SWRAST_CONTEXT(ctx);
157   GLuint i;
158   swrast->_AnyTextureCombine = GL_FALSE;
159   for (i = 0; i < ctx->Const.MaxTextureUnits; i++) {
160      if (ctx->Texture.Unit[i].EnvMode == GL_COMBINE_EXT ||
161          ctx->Texture.Unit[i].EnvMode == GL_COMBINE4_NV) {
162         swrast->_AnyTextureCombine = GL_TRUE;
163         return;
164      }
165   }
166}
167
168
169#define _SWRAST_NEW_DERIVED (_SWRAST_NEW_RASTERMASK |	\
170			     _NEW_TEXTURE |		\
171			     _NEW_HINT |		\
172			     _NEW_POLYGON )
173
174/* State referenced by _swrast_choose_triangle, _swrast_choose_line.
175 */
176#define _SWRAST_NEW_TRIANGLE (_SWRAST_NEW_DERIVED |		\
177			      _NEW_RENDERMODE|			\
178                              _NEW_POLYGON|			\
179                              _NEW_DEPTH|			\
180                              _NEW_STENCIL|			\
181                              _NEW_COLOR|			\
182                              _NEW_TEXTURE|			\
183                              _SWRAST_NEW_RASTERMASK|		\
184                              _NEW_LIGHT|			\
185                              _NEW_FOG |			\
186			      _DD_NEW_SEPARATE_SPECULAR)
187
188#define _SWRAST_NEW_LINE (_SWRAST_NEW_DERIVED |		\
189			  _NEW_RENDERMODE|		\
190                          _NEW_LINE|			\
191                          _NEW_TEXTURE|			\
192                          _NEW_LIGHT|			\
193                          _NEW_FOG|			\
194                          _NEW_DEPTH |			\
195                          _DD_NEW_SEPARATE_SPECULAR)
196
197#define _SWRAST_NEW_POINT (_SWRAST_NEW_DERIVED |	\
198			   _NEW_RENDERMODE |		\
199			   _NEW_POINT |			\
200			   _NEW_TEXTURE |		\
201			   _NEW_LIGHT |			\
202			   _NEW_FOG |			\
203                           _DD_NEW_SEPARATE_SPECULAR)
204
205#define _SWRAST_NEW_TEXTURE_SAMPLE_FUNC _NEW_TEXTURE
206
207#define _SWRAST_NEW_TEXTURE_ENV_MODE _NEW_TEXTURE
208
209#define _SWRAST_NEW_BLEND_FUNC _NEW_COLOR
210
211
212
213/* Stub for swrast->Triangle to select a true triangle function
214 * after a state change.
215 */
216static void
217_swrast_validate_triangle( GLcontext *ctx,
218			   const SWvertex *v0,
219                           const SWvertex *v1,
220                           const SWvertex *v2 )
221{
222   SWcontext *swrast = SWRAST_CONTEXT(ctx);
223
224   _swrast_validate_derived( ctx );
225   swrast->choose_triangle( ctx );
226
227   if ((ctx->_TriangleCaps & DD_SEPARATE_SPECULAR) &&
228       ctx->Texture._EnabledUnits == 0) {
229      swrast->SpecTriangle = swrast->Triangle;
230      swrast->Triangle = _swrast_add_spec_terms_triangle;
231   }
232
233   swrast->Triangle( ctx, v0, v1, v2 );
234}
235
236static void
237_swrast_validate_line( GLcontext *ctx, const SWvertex *v0, const SWvertex *v1 )
238{
239   SWcontext *swrast = SWRAST_CONTEXT(ctx);
240
241   _swrast_validate_derived( ctx );
242   swrast->choose_line( ctx );
243
244   if ((ctx->_TriangleCaps & DD_SEPARATE_SPECULAR) &&
245       ctx->Texture._EnabledUnits == 0) {
246      swrast->SpecLine = swrast->Line;
247      swrast->Line = _swrast_add_spec_terms_line;
248   }
249
250
251   swrast->Line( ctx, v0, v1 );
252}
253
254static void
255_swrast_validate_point( GLcontext *ctx, const SWvertex *v0 )
256{
257   SWcontext *swrast = SWRAST_CONTEXT(ctx);
258
259   _swrast_validate_derived( ctx );
260   swrast->choose_point( ctx );
261
262   if ((ctx->_TriangleCaps & DD_SEPARATE_SPECULAR) &&
263       ctx->Texture._EnabledUnits == 0) {
264      swrast->SpecPoint = swrast->Point;
265      swrast->Point = _swrast_add_spec_terms_point;
266   }
267
268   swrast->Point( ctx, v0 );
269}
270
271
272static void
273_swrast_validate_blend_func( GLcontext *ctx, GLuint n,
274			     const GLubyte mask[],
275			     GLchan src[][4],
276			     CONST GLchan dst[][4] )
277{
278   SWcontext *swrast = SWRAST_CONTEXT(ctx);
279
280   _swrast_validate_derived( ctx );
281   _swrast_choose_blend_func( ctx );
282
283   swrast->BlendFunc( ctx, n, mask, src, dst );
284}
285
286
287static void
288_swrast_validate_texture_sample( GLcontext *ctx, GLuint texUnit,
289				 const struct gl_texture_object *tObj,
290				 GLuint n, const GLfloat texcoords[][4],
291				 const GLfloat lambda[], GLchan rgba[][4] )
292{
293   SWcontext *swrast = SWRAST_CONTEXT(ctx);
294
295   _swrast_validate_derived( ctx );
296
297   /* Compute min/mag filter threshold */
298   if (tObj->MinFilter != tObj->MagFilter) {
299      if (tObj->MagFilter == GL_LINEAR
300          && (tObj->MinFilter == GL_NEAREST_MIPMAP_NEAREST ||
301              tObj->MinFilter == GL_NEAREST_MIPMAP_LINEAR)) {
302         swrast->_MinMagThresh[texUnit] = 0.5F;
303      }
304      else {
305         swrast->_MinMagThresh[texUnit] = 0.0F;
306      }
307   }
308
309   if (ctx->FragmentProgram.Enabled) {
310      ASSERT(ctx->FragmentProgram.Current);
311      /* only one target can be referenced per unit per fragment program */
312      switch (ctx->FragmentProgram.Current->TexturesUsed[texUnit]) {
313      case TEXTURE_1D_BIT:
314         tObj = ctx->Texture.Unit[texUnit].Current1D;
315         break;
316      case TEXTURE_2D_BIT:
317         tObj = ctx->Texture.Unit[texUnit].Current2D;
318         break;
319      case TEXTURE_3D_BIT:
320         tObj = ctx->Texture.Unit[texUnit].Current3D;
321         break;
322      case TEXTURE_CUBE_BIT:
323         tObj = ctx->Texture.Unit[texUnit].CurrentCubeMap;
324         break;
325      case TEXTURE_RECT_BIT:
326         tObj = ctx->Texture.Unit[texUnit].CurrentRect;
327         break;
328      default:
329         _mesa_problem(ctx, "Bad texture in _swrast_validate_texture_sample");
330         return;
331      }
332      if (!tObj->Complete) {
333         _mesa_test_texobj_completeness(ctx,
334                                        (struct gl_texture_object *) tObj );
335      }
336   }
337
338   swrast->TextureSample[texUnit] =
339      _swrast_choose_texture_sample_func( ctx, tObj );
340
341   swrast->TextureSample[texUnit]( ctx, texUnit, tObj, n, texcoords,
342                                   lambda, rgba );
343
344   /* GL_SGI_texture_color_table */
345   if (ctx->Texture.Unit[texUnit].ColorTableEnabled) {
346      _swrast_texture_table_lookup(&ctx->Texture.Unit[texUnit].ColorTable, n, rgba);
347   }
348}
349
350
351static void
352_swrast_sleep( GLcontext *ctx, GLuint new_state )
353{
354}
355
356
357static void
358_swrast_invalidate_state( GLcontext *ctx, GLuint new_state )
359{
360   SWcontext *swrast = SWRAST_CONTEXT(ctx);
361   GLuint i;
362
363   swrast->NewState |= new_state;
364
365   /* After 10 statechanges without any swrast functions being called,
366    * put the module to sleep.
367    */
368   if (++swrast->StateChanges > 10) {
369      swrast->InvalidateState = _swrast_sleep;
370      swrast->NewState = ~0;
371      new_state = ~0;
372   }
373
374   if (new_state & swrast->invalidate_triangle)
375      swrast->Triangle = _swrast_validate_triangle;
376
377   if (new_state & swrast->invalidate_line)
378      swrast->Line = _swrast_validate_line;
379
380   if (new_state & swrast->invalidate_point)
381      swrast->Point = _swrast_validate_point;
382
383   if (new_state & _SWRAST_NEW_BLEND_FUNC)
384      swrast->BlendFunc = _swrast_validate_blend_func;
385
386   if (new_state & _SWRAST_NEW_TEXTURE_SAMPLE_FUNC)
387      for (i = 0 ; i < ctx->Const.MaxTextureUnits ; i++)
388	 swrast->TextureSample[i] = _swrast_validate_texture_sample;
389
390   if (ctx->Visual.rgbMode) {
391      ASSERT(swrast->Driver.WriteRGBASpan);
392      ASSERT(swrast->Driver.WriteRGBSpan);
393      ASSERT(swrast->Driver.WriteMonoRGBASpan);
394      ASSERT(swrast->Driver.WriteRGBAPixels);
395      ASSERT(swrast->Driver.WriteMonoRGBAPixels);
396      ASSERT(swrast->Driver.ReadRGBASpan);
397      ASSERT(swrast->Driver.ReadRGBAPixels);
398   }
399   else {
400      ASSERT(swrast->Driver.WriteCI32Span);
401      ASSERT(swrast->Driver.WriteCI8Span);
402      ASSERT(swrast->Driver.WriteMonoCISpan);
403      ASSERT(swrast->Driver.WriteCI32Pixels);
404      ASSERT(swrast->Driver.WriteMonoCIPixels);
405      ASSERT(swrast->Driver.ReadCI32Span);
406      ASSERT(swrast->Driver.ReadCI32Pixels);
407   }
408}
409
410
411void
412_swrast_validate_derived( GLcontext *ctx )
413{
414   SWcontext *swrast = SWRAST_CONTEXT(ctx);
415
416   if (swrast->NewState) {
417      if (swrast->NewState & _SWRAST_NEW_RASTERMASK)
418 	 _swrast_update_rasterflags( ctx );
419
420      if (swrast->NewState & _NEW_POLYGON)
421	 _swrast_update_polygon( ctx );
422
423      if (swrast->NewState & _NEW_HINT)
424	 _swrast_update_hint( ctx );
425
426      if (swrast->NewState & _SWRAST_NEW_TEXTURE_ENV_MODE)
427	 _swrast_update_texture_env( ctx );
428
429      swrast->NewState = 0;
430      swrast->StateChanges = 0;
431      swrast->InvalidateState = _swrast_invalidate_state;
432   }
433}
434
435#define SWRAST_DEBUG 0
436
437/* Public entrypoints:  See also s_accum.c, s_bitmap.c, etc.
438 */
439void
440_swrast_Quad( GLcontext *ctx,
441	      const SWvertex *v0, const SWvertex *v1,
442              const SWvertex *v2, const SWvertex *v3 )
443{
444   if (SWRAST_DEBUG) {
445      _mesa_debug(ctx, "_swrast_Quad\n");
446      _swrast_print_vertex( ctx, v0 );
447      _swrast_print_vertex( ctx, v1 );
448      _swrast_print_vertex( ctx, v2 );
449      _swrast_print_vertex( ctx, v3 );
450   }
451   SWRAST_CONTEXT(ctx)->Triangle( ctx, v0, v1, v3 );
452   SWRAST_CONTEXT(ctx)->Triangle( ctx, v1, v2, v3 );
453}
454
455void
456_swrast_Triangle( GLcontext *ctx, const SWvertex *v0,
457                  const SWvertex *v1, const SWvertex *v2 )
458{
459   if (SWRAST_DEBUG) {
460      _mesa_debug(ctx, "_swrast_Triangle\n");
461      _swrast_print_vertex( ctx, v0 );
462      _swrast_print_vertex( ctx, v1 );
463      _swrast_print_vertex( ctx, v2 );
464   }
465   SWRAST_CONTEXT(ctx)->Triangle( ctx, v0, v1, v2 );
466}
467
468void
469_swrast_Line( GLcontext *ctx, const SWvertex *v0, const SWvertex *v1 )
470{
471   if (SWRAST_DEBUG) {
472      _mesa_debug(ctx, "_swrast_Line\n");
473      _swrast_print_vertex( ctx, v0 );
474      _swrast_print_vertex( ctx, v1 );
475   }
476   SWRAST_CONTEXT(ctx)->Line( ctx, v0, v1 );
477}
478
479void
480_swrast_Point( GLcontext *ctx, const SWvertex *v0 )
481{
482   if (SWRAST_DEBUG) {
483      _mesa_debug(ctx, "_swrast_Point\n");
484      _swrast_print_vertex( ctx, v0 );
485   }
486   SWRAST_CONTEXT(ctx)->Point( ctx, v0 );
487}
488
489void
490_swrast_InvalidateState( GLcontext *ctx, GLuint new_state )
491{
492   if (SWRAST_DEBUG) {
493      _mesa_debug(ctx, "_swrast_InvalidateState\n");
494   }
495   SWRAST_CONTEXT(ctx)->InvalidateState( ctx, new_state );
496}
497
498void
499_swrast_ResetLineStipple( GLcontext *ctx )
500{
501   if (SWRAST_DEBUG) {
502      _mesa_debug(ctx, "_swrast_ResetLineStipple\n");
503   }
504   SWRAST_CONTEXT(ctx)->StippleCounter = 0;
505}
506
507void
508_swrast_allow_vertex_fog( GLcontext *ctx, GLboolean value )
509{
510   if (SWRAST_DEBUG) {
511      _mesa_debug(ctx, "_swrast_allow_vertex_fog %d\n", value);
512   }
513   SWRAST_CONTEXT(ctx)->InvalidateState( ctx, _NEW_HINT );
514   SWRAST_CONTEXT(ctx)->AllowVertexFog = value;
515}
516
517void
518_swrast_allow_pixel_fog( GLcontext *ctx, GLboolean value )
519{
520   if (SWRAST_DEBUG) {
521      _mesa_debug(ctx, "_swrast_allow_pixel_fog %d\n", value);
522   }
523   SWRAST_CONTEXT(ctx)->InvalidateState( ctx, _NEW_HINT );
524   SWRAST_CONTEXT(ctx)->AllowPixelFog = value;
525}
526
527
528GLboolean
529_swrast_CreateContext( GLcontext *ctx )
530{
531   GLuint i;
532   SWcontext *swrast = (SWcontext *)CALLOC(sizeof(SWcontext));
533
534   if (SWRAST_DEBUG) {
535      _mesa_debug(ctx, "_swrast_CreateContext\n");
536   }
537
538   if (!swrast)
539      return GL_FALSE;
540
541   swrast->NewState = ~0;
542
543   swrast->choose_point = _swrast_choose_point;
544   swrast->choose_line = _swrast_choose_line;
545   swrast->choose_triangle = _swrast_choose_triangle;
546
547   swrast->invalidate_point = _SWRAST_NEW_POINT;
548   swrast->invalidate_line = _SWRAST_NEW_LINE;
549   swrast->invalidate_triangle = _SWRAST_NEW_TRIANGLE;
550
551   swrast->Point = _swrast_validate_point;
552   swrast->Line = _swrast_validate_line;
553   swrast->Triangle = _swrast_validate_triangle;
554   swrast->InvalidateState = _swrast_sleep;
555   swrast->BlendFunc = _swrast_validate_blend_func;
556
557   swrast->AllowVertexFog = GL_TRUE;
558   swrast->AllowPixelFog = GL_TRUE;
559
560   if (ctx->Visual.doubleBufferMode)
561      swrast->CurrentBuffer = BACK_LEFT_BIT;
562   else
563      swrast->CurrentBuffer = FRONT_LEFT_BIT;
564
565   /* Optimized Accum buffer */
566   swrast->_IntegerAccumMode = GL_TRUE;
567   swrast->_IntegerAccumScaler = 0.0;
568
569   for (i = 0; i < MAX_TEXTURE_IMAGE_UNITS; i++)
570      swrast->TextureSample[i] = _swrast_validate_texture_sample;
571
572   swrast->SpanArrays = MALLOC_STRUCT(span_arrays);
573   if (!swrast->SpanArrays) {
574      FREE(swrast);
575      return GL_FALSE;
576   }
577
578   /* init point span buffer */
579   swrast->PointSpan.primitive = GL_POINT;
580   swrast->PointSpan.start = 0;
581   swrast->PointSpan.end = 0;
582   swrast->PointSpan.facing = 0;
583   swrast->PointSpan.array = swrast->SpanArrays;
584
585   assert(ctx->Const.MaxTextureUnits > 0);
586   assert(ctx->Const.MaxTextureUnits <= MAX_TEXTURE_UNITS);
587
588   swrast->TexelBuffer = (GLchan *) MALLOC(ctx->Const.MaxTextureUnits *
589                                           MAX_WIDTH * 4 * sizeof(GLchan));
590   if (!swrast->TexelBuffer) {
591      FREE(swrast->SpanArrays);
592      FREE(swrast);
593      return GL_FALSE;
594   }
595
596   ctx->swrast_context = swrast;
597
598   return GL_TRUE;
599}
600
601void
602_swrast_DestroyContext( GLcontext *ctx )
603{
604   SWcontext *swrast = SWRAST_CONTEXT(ctx);
605
606   if (SWRAST_DEBUG) {
607      _mesa_debug(ctx, "_swrast_DestroyContext\n");
608   }
609
610   FREE( swrast->SpanArrays );
611   FREE( swrast->TexelBuffer );
612   FREE( swrast );
613
614   ctx->swrast_context = 0;
615}
616
617
618struct swrast_device_driver *
619_swrast_GetDeviceDriverReference( GLcontext *ctx )
620{
621   SWcontext *swrast = SWRAST_CONTEXT(ctx);
622   return &swrast->Driver;
623}
624
625void
626_swrast_flush( GLcontext *ctx )
627{
628   SWcontext *swrast = SWRAST_CONTEXT(ctx);
629   /* flush any pending fragments from rendering points */
630   if (swrast->PointSpan.end > 0) {
631      if (ctx->Visual.rgbMode) {
632         if (ctx->Texture._EnabledUnits)
633            _mesa_write_texture_span(ctx, &(swrast->PointSpan));
634         else
635            _mesa_write_rgba_span(ctx, &(swrast->PointSpan));
636      }
637      else {
638         _mesa_write_index_span(ctx, &(swrast->PointSpan));
639      }
640      swrast->PointSpan.end = 0;
641   }
642}
643
644void
645_swrast_render_primitive( GLcontext *ctx, GLenum prim )
646{
647   SWcontext *swrast = SWRAST_CONTEXT(ctx);
648   if (swrast->Primitive == GL_POINTS && prim != GL_POINTS) {
649      _swrast_flush(ctx);
650   }
651   swrast->Primitive = prim;
652}
653
654
655void
656_swrast_render_start( GLcontext *ctx )
657{
658   SWcontext *swrast = SWRAST_CONTEXT(ctx);
659   if (swrast->Driver.SpanRenderStart)
660      swrast->Driver.SpanRenderStart( ctx );
661   swrast->PointSpan.end = 0;
662}
663
664void
665_swrast_render_finish( GLcontext *ctx )
666{
667   SWcontext *swrast = SWRAST_CONTEXT(ctx);
668   if (swrast->Driver.SpanRenderFinish)
669      swrast->Driver.SpanRenderFinish( ctx );
670
671   _swrast_flush(ctx);
672}
673
674
675#define SWRAST_DEBUG_VERTICES 0
676
677void
678_swrast_print_vertex( GLcontext *ctx, const SWvertex *v )
679{
680   GLuint i;
681
682   if (SWRAST_DEBUG_VERTICES) {
683      _mesa_debug(ctx, "win %f %f %f %f\n",
684                  v->win[0], v->win[1], v->win[2], v->win[3]);
685
686      for (i = 0 ; i < ctx->Const.MaxTextureUnits ; i++)
687	 if (ctx->Texture.Unit[i]._ReallyEnabled)
688	    _mesa_debug(ctx, "texcoord[%d] %f %f %f %f\n", i,
689                        v->texcoord[i][0], v->texcoord[i][1],
690                        v->texcoord[i][2], v->texcoord[i][3]);
691
692#if CHAN_TYPE == GL_FLOAT
693      _mesa_debug(ctx, "color %f %f %f %f\n",
694                  v->color[0], v->color[1], v->color[2], v->color[3]);
695      _mesa_debug(ctx, "spec %f %f %f %f\n",
696                  v->specular[0], v->specular[1],
697                  v->specular[2], v->specular[3]);
698#else
699      _mesa_debug(ctx, "color %d %d %d %d\n",
700                  v->color[0], v->color[1], v->color[2], v->color[3]);
701      _mesa_debug(ctx, "spec %d %d %d %d\n",
702                  v->specular[0], v->specular[1],
703                  v->specular[2], v->specular[3]);
704#endif
705      _mesa_debug(ctx, "fog %f\n", v->fog);
706      _mesa_debug(ctx, "index %d\n", v->index);
707      _mesa_debug(ctx, "pointsize %f\n", v->pointSize);
708      _mesa_debug(ctx, "\n");
709   }
710}
711