s_context.c revision db79b5683cfc3f2ea3f9b0aca8c4d149bf9a63f7 
1/*
2 * Mesa 3-D graphics library
3 * Version:  6.1
4 *
5 * Copyright (C) 1999-2004  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 "context.h"
31#include "colormac.h"
32#include "mtypes.h"
33#include "program.h"
34#include "texobj.h"
35#include "nvfragprog.h"
36
37#include "swrast.h"
38#include "s_blend.h"
39#include "s_context.h"
40#include "s_lines.h"
41#include "s_points.h"
42#include "s_span.h"
43#include "s_triangle.h"
44#include "s_texture.h"
45
46
47/*
48 * Recompute the value of swrast->_RasterMask, etc. according to
49 * the current context.
50 */
51static void
52_swrast_update_rasterflags( GLcontext *ctx )
53{
54   GLuint RasterMask = 0;
55
56   if (ctx->Color.AlphaEnabled)           RasterMask |= ALPHATEST_BIT;
57   if (ctx->Color.BlendEnabled)           RasterMask |= BLEND_BIT;
58   if (ctx->Depth.Test)                   RasterMask |= DEPTH_BIT;
59   if (ctx->Fog.Enabled)                  RasterMask |= FOG_BIT;
60   if (ctx->Scissor.Enabled)              RasterMask |= CLIP_BIT;
61   if (ctx->Stencil.Enabled)              RasterMask |= STENCIL_BIT;
62   if (ctx->Visual.rgbMode) {
63      const GLuint colorMask = *((GLuint *) &ctx->Color.ColorMask);
64      if (colorMask != 0xffffffff)        RasterMask |= MASKING_BIT;
65      if (ctx->Color._LogicOpEnabled)     RasterMask |= LOGIC_OP_BIT;
66      if (ctx->Texture._EnabledUnits)     RasterMask |= TEXTURE_BIT;
67   }
68   else {
69      if (ctx->Color.IndexMask != 0xffffffff) RasterMask |= MASKING_BIT;
70      if (ctx->Color.IndexLogicOpEnabled)     RasterMask |= LOGIC_OP_BIT;
71   }
72
73   if (ctx->DrawBuffer->UseSoftwareAlphaBuffers
74       && ctx->Color.ColorMask[ACOMP]
75       && ctx->Color.DrawBuffer != GL_NONE)
76      RasterMask |= ALPHABUF_BIT;
77
78   if (   ctx->Viewport.X < 0
79       || ctx->Viewport.X + ctx->Viewport.Width > (GLint) ctx->DrawBuffer->Width
80       || ctx->Viewport.Y < 0
81       || ctx->Viewport.Y + ctx->Viewport.Height > (GLint) ctx->DrawBuffer->Height) {
82      RasterMask |= CLIP_BIT;
83   }
84
85   if (ctx->Depth.OcclusionTest || ctx->Occlusion.Active)
86      RasterMask |= OCCLUSION_BIT;
87
88
89   /* If we're not drawing to exactly one color buffer set the
90    * MULTI_DRAW_BIT flag.  Also set it if we're drawing to no
91    * buffers or the RGBA or CI mask disables all writes.
92    */
93   if (ctx->Color._DrawDestMask != FRONT_LEFT_BIT &&
94       ctx->Color._DrawDestMask != BACK_LEFT_BIT &&
95       ctx->Color._DrawDestMask != FRONT_RIGHT_BIT &&
96       ctx->Color._DrawDestMask != BACK_RIGHT_BIT) {
97      /* more than one color buffer designated for writing (or zero buffers) */
98      RasterMask |= MULTI_DRAW_BIT;
99   }
100   else if (ctx->Visual.rgbMode && *((GLuint *) ctx->Color.ColorMask) == 0) {
101      RasterMask |= MULTI_DRAW_BIT; /* all RGBA channels disabled */
102   }
103   else if (!ctx->Visual.rgbMode && ctx->Color.IndexMask==0) {
104      RasterMask |= MULTI_DRAW_BIT; /* all color index bits disabled */
105   }
106
107   if (ctx->FragmentProgram.Enabled) {
108      RasterMask |= FRAGPROG_BIT;
109   }
110
111   SWRAST_CONTEXT(ctx)->_RasterMask = RasterMask;
112}
113
114
115static void
116_swrast_update_polygon( GLcontext *ctx )
117{
118   GLfloat backface_sign = 1;
119
120   if (ctx->Polygon.CullFlag) {
121      backface_sign = 1;
122      switch(ctx->Polygon.CullFaceMode) {
123      case GL_BACK:
124	 if(ctx->Polygon.FrontFace==GL_CCW)
125	    backface_sign = -1;
126	 break;
127      case GL_FRONT:
128	 if(ctx->Polygon.FrontFace!=GL_CCW)
129	    backface_sign = -1;
130	 break;
131      default:
132      case GL_FRONT_AND_BACK:
133	 backface_sign = 0;
134	 break;
135      }
136   }
137   else {
138      backface_sign = 0;
139   }
140
141   SWRAST_CONTEXT(ctx)->_BackfaceSign = backface_sign;
142}
143
144
145static void
146_swrast_update_fog_hint( GLcontext *ctx )
147{
148   SWcontext *swrast = SWRAST_CONTEXT(ctx);
149   swrast->_PreferPixelFog = (!swrast->AllowVertexFog ||
150                              ctx->FragmentProgram.Enabled ||
151			      (ctx->Hint.Fog == GL_NICEST &&
152			       swrast->AllowPixelFog));
153}
154
155
156
157/*
158 * Update the swrast->_AnyTextureCombine flag.
159 */
160static void
161_swrast_update_texture_env( GLcontext *ctx )
162{
163   SWcontext *swrast = SWRAST_CONTEXT(ctx);
164   GLuint i;
165   swrast->_AnyTextureCombine = GL_FALSE;
166   for (i = 0; i < ctx->Const.MaxTextureUnits; i++) {
167      if (ctx->Texture.Unit[i].EnvMode == GL_COMBINE_EXT ||
168          ctx->Texture.Unit[i].EnvMode == GL_COMBINE4_NV) {
169         swrast->_AnyTextureCombine = GL_TRUE;
170         return;
171      }
172   }
173}
174
175
176/*
177 * Update swrast->_FogColor and swrast->_FogEnable values.
178 */
179static void
180_swrast_update_fog_state( GLcontext *ctx )
181{
182   SWcontext *swrast = SWRAST_CONTEXT(ctx);
183
184   /* convert fog color to GLchan values */
185   CLAMPED_FLOAT_TO_CHAN(swrast->_FogColor[RCOMP], ctx->Fog.Color[RCOMP]);
186   CLAMPED_FLOAT_TO_CHAN(swrast->_FogColor[GCOMP], ctx->Fog.Color[GCOMP]);
187   CLAMPED_FLOAT_TO_CHAN(swrast->_FogColor[BCOMP], ctx->Fog.Color[BCOMP]);
188
189   /* determine if fog is needed */
190   swrast->_FogEnabled = GL_FALSE;
191   if (ctx->Fog.Enabled) {
192      swrast->_FogEnabled = GL_TRUE;
193   }
194   else if (ctx->FragmentProgram.Enabled &&
195        ctx->FragmentProgram.Current->Base.Target == GL_FRAGMENT_PROGRAM_ARB) {
196      const struct fragment_program *p;
197      p = (struct fragment_program *) ctx->FragmentProgram.Current;
198      if (p->FogOption != GL_NONE) {
199         swrast->_FogEnabled = GL_TRUE;
200      }
201   }
202}
203
204
205static void
206_swrast_update_fragment_program( GLcontext *ctx )
207{
208   if (ctx->FragmentProgram.Enabled) {
209      struct fragment_program *program = ctx->FragmentProgram.Current;
210      _mesa_load_state_parameters(ctx, program->Parameters);
211   }
212}
213
214
215
216#define _SWRAST_NEW_DERIVED (_SWRAST_NEW_RASTERMASK |	\
217			     _NEW_TEXTURE |		\
218			     _NEW_HINT |		\
219			     _NEW_POLYGON )
220
221/* State referenced by _swrast_choose_triangle, _swrast_choose_line.
222 */
223#define _SWRAST_NEW_TRIANGLE (_SWRAST_NEW_DERIVED |		\
224			      _NEW_RENDERMODE|			\
225                              _NEW_POLYGON|			\
226                              _NEW_DEPTH|			\
227                              _NEW_STENCIL|			\
228                              _NEW_COLOR|			\
229                              _NEW_TEXTURE|			\
230                              _SWRAST_NEW_RASTERMASK|		\
231                              _NEW_LIGHT|			\
232                              _NEW_FOG |			\
233			      _DD_NEW_SEPARATE_SPECULAR)
234
235#define _SWRAST_NEW_LINE (_SWRAST_NEW_DERIVED |		\
236			  _NEW_RENDERMODE|		\
237                          _NEW_LINE|			\
238                          _NEW_TEXTURE|			\
239                          _NEW_LIGHT|			\
240                          _NEW_FOG|			\
241                          _NEW_DEPTH |			\
242                          _DD_NEW_SEPARATE_SPECULAR)
243
244#define _SWRAST_NEW_POINT (_SWRAST_NEW_DERIVED |	\
245			   _NEW_RENDERMODE |		\
246			   _NEW_POINT |			\
247			   _NEW_TEXTURE |		\
248			   _NEW_LIGHT |			\
249			   _NEW_FOG |			\
250                           _DD_NEW_SEPARATE_SPECULAR)
251
252#define _SWRAST_NEW_TEXTURE_SAMPLE_FUNC _NEW_TEXTURE
253
254#define _SWRAST_NEW_TEXTURE_ENV_MODE _NEW_TEXTURE
255
256#define _SWRAST_NEW_BLEND_FUNC _NEW_COLOR
257
258
259
260/* Stub for swrast->Triangle to select a true triangle function
261 * after a state change.
262 */
263static void
264_swrast_validate_triangle( GLcontext *ctx,
265			   const SWvertex *v0,
266                           const SWvertex *v1,
267                           const SWvertex *v2 )
268{
269   SWcontext *swrast = SWRAST_CONTEXT(ctx);
270
271   _swrast_validate_derived( ctx );
272   swrast->choose_triangle( ctx );
273
274   if (ctx->Texture._EnabledUnits == 0
275       && NEED_SECONDARY_COLOR(ctx)
276       && !ctx->FragmentProgram.Enabled) {
277      /* separate specular color, but no texture */
278      swrast->SpecTriangle = swrast->Triangle;
279      swrast->Triangle = _swrast_add_spec_terms_triangle;
280   }
281
282   swrast->Triangle( ctx, v0, v1, v2 );
283}
284
285static void
286_swrast_validate_line( GLcontext *ctx, const SWvertex *v0, const SWvertex *v1 )
287{
288   SWcontext *swrast = SWRAST_CONTEXT(ctx);
289
290   _swrast_validate_derived( ctx );
291   swrast->choose_line( ctx );
292
293   if (ctx->Texture._EnabledUnits == 0
294       && NEED_SECONDARY_COLOR(ctx)
295       && !ctx->FragmentProgram.Enabled) {
296      swrast->SpecLine = swrast->Line;
297      swrast->Line = _swrast_add_spec_terms_line;
298   }
299
300
301   swrast->Line( ctx, v0, v1 );
302}
303
304static void
305_swrast_validate_point( GLcontext *ctx, const SWvertex *v0 )
306{
307   SWcontext *swrast = SWRAST_CONTEXT(ctx);
308
309   _swrast_validate_derived( ctx );
310   swrast->choose_point( ctx );
311
312   if (ctx->Texture._EnabledUnits == 0
313       && NEED_SECONDARY_COLOR(ctx)
314       && !ctx->FragmentProgram.Enabled) {
315      swrast->SpecPoint = swrast->Point;
316      swrast->Point = _swrast_add_spec_terms_point;
317   }
318
319   swrast->Point( ctx, v0 );
320}
321
322
323static void _ASMAPI
324_swrast_validate_blend_func( GLcontext *ctx, GLuint n,
325			     const GLubyte mask[],
326			     GLchan src[][4],
327			     CONST GLchan dst[][4] )
328{
329   SWcontext *swrast = SWRAST_CONTEXT(ctx);
330
331   _swrast_validate_derived( ctx );
332   _swrast_choose_blend_func( ctx );
333
334   swrast->BlendFunc( ctx, n, mask, src, dst );
335}
336
337
338static void
339_swrast_validate_texture_sample( GLcontext *ctx, GLuint texUnit,
340				 const struct gl_texture_object *tObj,
341				 GLuint n, const GLfloat texcoords[][4],
342				 const GLfloat lambda[], GLchan rgba[][4] )
343{
344   SWcontext *swrast = SWRAST_CONTEXT(ctx);
345
346   _swrast_validate_derived( ctx );
347
348   /* Compute min/mag filter threshold */
349   if (tObj->MinFilter != tObj->MagFilter) {
350      if (tObj->MagFilter == GL_LINEAR
351          && (tObj->MinFilter == GL_NEAREST_MIPMAP_NEAREST ||
352              tObj->MinFilter == GL_NEAREST_MIPMAP_LINEAR)) {
353         swrast->_MinMagThresh[texUnit] = 0.5F;
354      }
355      else {
356         swrast->_MinMagThresh[texUnit] = 0.0F;
357      }
358   }
359
360   swrast->TextureSample[texUnit] =
361      _swrast_choose_texture_sample_func( ctx, tObj );
362
363   swrast->TextureSample[texUnit]( ctx, texUnit, tObj, n, texcoords,
364                                   lambda, rgba );
365}
366
367
368static void
369_swrast_sleep( GLcontext *ctx, GLuint new_state )
370{
371}
372
373
374static void
375_swrast_invalidate_state( GLcontext *ctx, GLuint new_state )
376{
377   SWcontext *swrast = SWRAST_CONTEXT(ctx);
378   GLuint i;
379
380   swrast->NewState |= new_state;
381
382   /* After 10 statechanges without any swrast functions being called,
383    * put the module to sleep.
384    */
385   if (++swrast->StateChanges > 10) {
386      swrast->InvalidateState = _swrast_sleep;
387      swrast->NewState = ~0;
388      new_state = ~0;
389   }
390
391   if (new_state & swrast->invalidate_triangle)
392      swrast->Triangle = _swrast_validate_triangle;
393
394   if (new_state & swrast->invalidate_line)
395      swrast->Line = _swrast_validate_line;
396
397   if (new_state & swrast->invalidate_point)
398      swrast->Point = _swrast_validate_point;
399
400   if (new_state & _SWRAST_NEW_BLEND_FUNC)
401      swrast->BlendFunc = _swrast_validate_blend_func;
402
403   if (new_state & _SWRAST_NEW_TEXTURE_SAMPLE_FUNC)
404      for (i = 0 ; i < ctx->Const.MaxTextureUnits ; i++)
405	 swrast->TextureSample[i] = _swrast_validate_texture_sample;
406
407   if (ctx->Visual.rgbMode) {
408      ASSERT(swrast->Driver.WriteRGBASpan);
409      ASSERT(swrast->Driver.WriteRGBSpan);
410      ASSERT(swrast->Driver.WriteMonoRGBASpan);
411      ASSERT(swrast->Driver.WriteRGBAPixels);
412      ASSERT(swrast->Driver.WriteMonoRGBAPixels);
413      ASSERT(swrast->Driver.ReadRGBASpan);
414      ASSERT(swrast->Driver.ReadRGBAPixels);
415   }
416   else {
417      ASSERT(swrast->Driver.WriteCI32Span);
418      ASSERT(swrast->Driver.WriteCI8Span);
419      ASSERT(swrast->Driver.WriteMonoCISpan);
420      ASSERT(swrast->Driver.WriteCI32Pixels);
421      ASSERT(swrast->Driver.WriteMonoCIPixels);
422      ASSERT(swrast->Driver.ReadCI32Span);
423      ASSERT(swrast->Driver.ReadCI32Pixels);
424   }
425}
426
427
428void
429_swrast_validate_derived( GLcontext *ctx )
430{
431   SWcontext *swrast = SWRAST_CONTEXT(ctx);
432
433   if (swrast->NewState) {
434      if (swrast->NewState & _SWRAST_NEW_RASTERMASK)
435 	 _swrast_update_rasterflags( ctx );
436
437      if (swrast->NewState & _NEW_POLYGON)
438	 _swrast_update_polygon( ctx );
439
440      if (swrast->NewState & (_NEW_HINT | _NEW_PROGRAM))
441	 _swrast_update_fog_hint( ctx );
442
443      if (swrast->NewState & _SWRAST_NEW_TEXTURE_ENV_MODE)
444	 _swrast_update_texture_env( ctx );
445
446      if (swrast->NewState & _NEW_FOG)
447         _swrast_update_fog_state( ctx );
448
449      if (swrast->NewState & _NEW_PROGRAM)
450	 _swrast_update_fragment_program( ctx );
451
452      swrast->NewState = 0;
453      swrast->StateChanges = 0;
454      swrast->InvalidateState = _swrast_invalidate_state;
455   }
456}
457
458#define SWRAST_DEBUG 0
459
460/* Public entrypoints:  See also s_accum.c, s_bitmap.c, etc.
461 */
462void
463_swrast_Quad( GLcontext *ctx,
464	      const SWvertex *v0, const SWvertex *v1,
465              const SWvertex *v2, const SWvertex *v3 )
466{
467   if (SWRAST_DEBUG) {
468      _mesa_debug(ctx, "_swrast_Quad\n");
469      _swrast_print_vertex( ctx, v0 );
470      _swrast_print_vertex( ctx, v1 );
471      _swrast_print_vertex( ctx, v2 );
472      _swrast_print_vertex( ctx, v3 );
473   }
474   SWRAST_CONTEXT(ctx)->Triangle( ctx, v0, v1, v3 );
475   SWRAST_CONTEXT(ctx)->Triangle( ctx, v1, v2, v3 );
476}
477
478void
479_swrast_Triangle( GLcontext *ctx, const SWvertex *v0,
480                  const SWvertex *v1, const SWvertex *v2 )
481{
482   if (SWRAST_DEBUG) {
483      _mesa_debug(ctx, "_swrast_Triangle\n");
484      _swrast_print_vertex( ctx, v0 );
485      _swrast_print_vertex( ctx, v1 );
486      _swrast_print_vertex( ctx, v2 );
487   }
488   SWRAST_CONTEXT(ctx)->Triangle( ctx, v0, v1, v2 );
489}
490
491void
492_swrast_Line( GLcontext *ctx, const SWvertex *v0, const SWvertex *v1 )
493{
494   if (SWRAST_DEBUG) {
495      _mesa_debug(ctx, "_swrast_Line\n");
496      _swrast_print_vertex( ctx, v0 );
497      _swrast_print_vertex( ctx, v1 );
498   }
499   SWRAST_CONTEXT(ctx)->Line( ctx, v0, v1 );
500}
501
502void
503_swrast_Point( GLcontext *ctx, const SWvertex *v0 )
504{
505   if (SWRAST_DEBUG) {
506      _mesa_debug(ctx, "_swrast_Point\n");
507      _swrast_print_vertex( ctx, v0 );
508   }
509   SWRAST_CONTEXT(ctx)->Point( ctx, v0 );
510}
511
512void
513_swrast_InvalidateState( GLcontext *ctx, GLuint new_state )
514{
515   if (SWRAST_DEBUG) {
516      _mesa_debug(ctx, "_swrast_InvalidateState\n");
517   }
518   SWRAST_CONTEXT(ctx)->InvalidateState( ctx, new_state );
519}
520
521void
522_swrast_ResetLineStipple( GLcontext *ctx )
523{
524   if (SWRAST_DEBUG) {
525      _mesa_debug(ctx, "_swrast_ResetLineStipple\n");
526   }
527   SWRAST_CONTEXT(ctx)->StippleCounter = 0;
528}
529
530void
531_swrast_allow_vertex_fog( GLcontext *ctx, GLboolean value )
532{
533   if (SWRAST_DEBUG) {
534      _mesa_debug(ctx, "_swrast_allow_vertex_fog %d\n", value);
535   }
536   SWRAST_CONTEXT(ctx)->InvalidateState( ctx, _NEW_HINT );
537   SWRAST_CONTEXT(ctx)->AllowVertexFog = value;
538}
539
540void
541_swrast_allow_pixel_fog( GLcontext *ctx, GLboolean value )
542{
543   if (SWRAST_DEBUG) {
544      _mesa_debug(ctx, "_swrast_allow_pixel_fog %d\n", value);
545   }
546   SWRAST_CONTEXT(ctx)->InvalidateState( ctx, _NEW_HINT );
547   SWRAST_CONTEXT(ctx)->AllowPixelFog = value;
548}
549
550
551GLboolean
552_swrast_CreateContext( GLcontext *ctx )
553{
554   GLuint i;
555   SWcontext *swrast = (SWcontext *)CALLOC(sizeof(SWcontext));
556
557   if (SWRAST_DEBUG) {
558      _mesa_debug(ctx, "_swrast_CreateContext\n");
559   }
560
561   if (!swrast)
562      return GL_FALSE;
563
564   swrast->NewState = ~0;
565
566   swrast->choose_point = _swrast_choose_point;
567   swrast->choose_line = _swrast_choose_line;
568   swrast->choose_triangle = _swrast_choose_triangle;
569
570   swrast->invalidate_point = _SWRAST_NEW_POINT;
571   swrast->invalidate_line = _SWRAST_NEW_LINE;
572   swrast->invalidate_triangle = _SWRAST_NEW_TRIANGLE;
573
574   swrast->Point = _swrast_validate_point;
575   swrast->Line = _swrast_validate_line;
576   swrast->Triangle = _swrast_validate_triangle;
577   swrast->InvalidateState = _swrast_sleep;
578   swrast->BlendFunc = _swrast_validate_blend_func;
579
580   swrast->AllowVertexFog = GL_TRUE;
581   swrast->AllowPixelFog = GL_TRUE;
582
583   if (ctx->Visual.doubleBufferMode)
584      swrast->CurrentBuffer = BACK_LEFT_BIT;
585   else
586      swrast->CurrentBuffer = FRONT_LEFT_BIT;
587
588   /* Optimized Accum buffer */
589   swrast->_IntegerAccumMode = GL_TRUE;
590   swrast->_IntegerAccumScaler = 0.0;
591
592   for (i = 0; i < MAX_TEXTURE_IMAGE_UNITS; i++)
593      swrast->TextureSample[i] = _swrast_validate_texture_sample;
594
595   swrast->SpanArrays = MALLOC_STRUCT(span_arrays);
596   if (!swrast->SpanArrays) {
597      FREE(swrast);
598      return GL_FALSE;
599   }
600
601   /* init point span buffer */
602   swrast->PointSpan.primitive = GL_POINT;
603   swrast->PointSpan.start = 0;
604   swrast->PointSpan.end = 0;
605   swrast->PointSpan.facing = 0;
606   swrast->PointSpan.array = swrast->SpanArrays;
607
608   assert(ctx->Const.MaxTextureUnits > 0);
609   assert(ctx->Const.MaxTextureUnits <= MAX_TEXTURE_UNITS);
610
611   swrast->TexelBuffer = (GLchan *) MALLOC(ctx->Const.MaxTextureUnits *
612                                           MAX_WIDTH * 4 * sizeof(GLchan));
613   if (!swrast->TexelBuffer) {
614      FREE(swrast->SpanArrays);
615      FREE(swrast);
616      return GL_FALSE;
617   }
618
619   ctx->swrast_context = swrast;
620
621   return GL_TRUE;
622}
623
624void
625_swrast_DestroyContext( GLcontext *ctx )
626{
627   SWcontext *swrast = SWRAST_CONTEXT(ctx);
628
629   if (SWRAST_DEBUG) {
630      _mesa_debug(ctx, "_swrast_DestroyContext\n");
631   }
632
633   FREE( swrast->SpanArrays );
634   FREE( swrast->TexelBuffer );
635   FREE( swrast );
636
637   ctx->swrast_context = 0;
638}
639
640
641struct swrast_device_driver *
642_swrast_GetDeviceDriverReference( GLcontext *ctx )
643{
644   SWcontext *swrast = SWRAST_CONTEXT(ctx);
645   return &swrast->Driver;
646}
647
648void
649_swrast_flush( GLcontext *ctx )
650{
651   SWcontext *swrast = SWRAST_CONTEXT(ctx);
652   /* flush any pending fragments from rendering points */
653   if (swrast->PointSpan.end > 0) {
654      if (ctx->Visual.rgbMode) {
655         if (ctx->Texture._EnabledCoordUnits)
656            _swrast_write_texture_span(ctx, &(swrast->PointSpan));
657         else
658            _swrast_write_rgba_span(ctx, &(swrast->PointSpan));
659      }
660      else {
661         _swrast_write_index_span(ctx, &(swrast->PointSpan));
662      }
663      swrast->PointSpan.end = 0;
664   }
665}
666
667void
668_swrast_render_primitive( GLcontext *ctx, GLenum prim )
669{
670   SWcontext *swrast = SWRAST_CONTEXT(ctx);
671   if (swrast->Primitive == GL_POINTS && prim != GL_POINTS) {
672      _swrast_flush(ctx);
673   }
674   swrast->Primitive = prim;
675}
676
677
678void
679_swrast_render_start( GLcontext *ctx )
680{
681   SWcontext *swrast = SWRAST_CONTEXT(ctx);
682   if (swrast->Driver.SpanRenderStart)
683      swrast->Driver.SpanRenderStart( ctx );
684   swrast->PointSpan.end = 0;
685}
686
687void
688_swrast_render_finish( GLcontext *ctx )
689{
690   SWcontext *swrast = SWRAST_CONTEXT(ctx);
691   if (swrast->Driver.SpanRenderFinish)
692      swrast->Driver.SpanRenderFinish( ctx );
693
694   _swrast_flush(ctx);
695}
696
697
698#define SWRAST_DEBUG_VERTICES 0
699
700void
701_swrast_print_vertex( GLcontext *ctx, const SWvertex *v )
702{
703   GLuint i;
704
705   if (SWRAST_DEBUG_VERTICES) {
706      _mesa_debug(ctx, "win %f %f %f %f\n",
707                  v->win[0], v->win[1], v->win[2], v->win[3]);
708
709      for (i = 0 ; i < ctx->Const.MaxTextureUnits ; i++)
710	 if (ctx->Texture.Unit[i]._ReallyEnabled)
711	    _mesa_debug(ctx, "texcoord[%d] %f %f %f %f\n", i,
712                        v->texcoord[i][0], v->texcoord[i][1],
713                        v->texcoord[i][2], v->texcoord[i][3]);
714
715#if CHAN_TYPE == GL_FLOAT
716      _mesa_debug(ctx, "color %f %f %f %f\n",
717                  v->color[0], v->color[1], v->color[2], v->color[3]);
718      _mesa_debug(ctx, "spec %f %f %f %f\n",
719                  v->specular[0], v->specular[1],
720                  v->specular[2], v->specular[3]);
721#else
722      _mesa_debug(ctx, "color %d %d %d %d\n",
723                  v->color[0], v->color[1], v->color[2], v->color[3]);
724      _mesa_debug(ctx, "spec %d %d %d %d\n",
725                  v->specular[0], v->specular[1],
726                  v->specular[2], v->specular[3]);
727#endif
728      _mesa_debug(ctx, "fog %f\n", v->fog);
729      _mesa_debug(ctx, "index %d\n", v->index);
730      _mesa_debug(ctx, "pointsize %f\n", v->pointSize);
731      _mesa_debug(ctx, "\n");
732   }
733}
734