s_context.c revision 89dae684aa1d74b06a4f70cb76b33671d0cef9e6 
1/* $Id: s_context.c,v 1.21 2001/05/17 09:32:17 keithw Exp $ */
2
3/*
4 * Mesa 3-D graphics library
5 * Version:  3.5
6 *
7 * Copyright (C) 1999-2001  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 "mtypes.h"
32#include "mem.h"
33
34#include "s_pb.h"
35#include "s_points.h"
36#include "s_lines.h"
37#include "s_triangle.h"
38#include "s_blend.h"
39#include "s_context.h"
40#include "s_texture.h"
41
42
43
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 |= SCISSOR_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._ReallyEnabled)     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 > ctx->DrawBuffer->Width
79       || ctx->Viewport.Y < 0
80       || ctx->Viewport.Y + ctx->Viewport.Height > ctx->DrawBuffer->Height) {
81      RasterMask |= WINCLIP_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.MultiDrawBuffer) {
93      RasterMask |= MULTI_DRAW_BIT;
94   }
95   else if (ctx->Color.DrawBuffer==GL_NONE) {
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
109static 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
139static 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#define _SWRAST_NEW_DERIVED (_SWRAST_NEW_RASTERMASK |	\
149			     _NEW_TEXTURE |		\
150			     _NEW_HINT |		\
151			     _NEW_POLYGON )
152
153/* State referenced by _swrast_choose_triangle, _swrast_choose_line.
154 */
155#define _SWRAST_NEW_TRIANGLE (_SWRAST_NEW_DERIVED |		\
156			      _NEW_RENDERMODE|			\
157                              _NEW_POLYGON|			\
158                              _NEW_DEPTH|			\
159                              _NEW_STENCIL|			\
160                              _NEW_COLOR|			\
161                              _NEW_TEXTURE|			\
162                              _SWRAST_NEW_RASTERMASK|		\
163                              _NEW_LIGHT|			\
164                              _NEW_FOG |			\
165			      _DD_NEW_SEPARATE_SPECULAR)
166
167#define _SWRAST_NEW_LINE (_SWRAST_NEW_DERIVED |		\
168			  _NEW_RENDERMODE|		\
169                          _NEW_LINE|			\
170                          _NEW_TEXTURE|			\
171                          _NEW_LIGHT|			\
172                          _NEW_FOG|			\
173                          _NEW_DEPTH |			\
174                          _DD_NEW_SEPARATE_SPECULAR)
175
176#define _SWRAST_NEW_POINT (_SWRAST_NEW_DERIVED |	\
177			   _NEW_RENDERMODE |		\
178			   _NEW_POINT |			\
179			   _NEW_TEXTURE |		\
180			   _NEW_LIGHT |			\
181			   _NEW_FOG |			\
182                           _DD_NEW_SEPARATE_SPECULAR)
183
184#define _SWRAST_NEW_TEXTURE_SAMPLE_FUNC _NEW_TEXTURE
185
186#define _SWRAST_NEW_BLEND_FUNC _NEW_COLOR
187
188
189
190/* Stub for swrast->Triangle to select a true triangle function
191 * after a state change.
192 */
193static void
194_swrast_validate_triangle( GLcontext *ctx,
195			   const SWvertex *v0,
196                           const SWvertex *v1,
197                           const SWvertex *v2 )
198{
199   SWcontext *swrast = SWRAST_CONTEXT(ctx);
200
201   _swrast_validate_derived( ctx );
202   swrast->choose_triangle( ctx );
203
204   if ((ctx->_TriangleCaps & DD_SEPARATE_SPECULAR) &&
205       !ctx->Texture._ReallyEnabled) {
206      swrast->SpecTriangle = swrast->Triangle;
207      swrast->Triangle = _swrast_add_spec_terms_triangle;
208   }
209
210   swrast->Triangle( ctx, v0, v1, v2 );
211}
212
213static void
214_swrast_validate_line( GLcontext *ctx, const SWvertex *v0, const SWvertex *v1 )
215{
216   SWcontext *swrast = SWRAST_CONTEXT(ctx);
217
218   _swrast_validate_derived( ctx );
219   swrast->choose_line( ctx );
220
221   if ((ctx->_TriangleCaps & DD_SEPARATE_SPECULAR) &&
222       !ctx->Texture._ReallyEnabled) {
223      swrast->SpecLine = swrast->Line;
224      swrast->Line = _swrast_add_spec_terms_line;
225   }
226
227
228   swrast->Line( ctx, v0, v1 );
229}
230
231static void
232_swrast_validate_point( GLcontext *ctx, const SWvertex *v0 )
233{
234   SWcontext *swrast = SWRAST_CONTEXT(ctx);
235
236   _swrast_validate_derived( ctx );
237   swrast->choose_point( ctx );
238
239   if ((ctx->_TriangleCaps & DD_SEPARATE_SPECULAR) &&
240       !ctx->Texture._ReallyEnabled) {
241      swrast->SpecPoint = swrast->Point;
242      swrast->Point = _swrast_add_spec_terms_point;
243   }
244
245   swrast->Point( ctx, v0 );
246}
247
248static void
249_swrast_validate_blend_func( GLcontext *ctx, GLuint n,
250			     const GLubyte mask[],
251			     GLchan src[][4],
252			     CONST GLchan dst[][4] )
253{
254   SWcontext *swrast = SWRAST_CONTEXT(ctx);
255
256   _swrast_validate_derived( ctx );
257   _swrast_choose_blend_func( ctx );
258
259   swrast->BlendFunc( ctx, n, mask, src, dst );
260}
261
262
263static void
264_swrast_validate_texture_sample( GLcontext *ctx, GLuint texUnit,
265				 const struct gl_texture_object *tObj,
266				 GLuint n,
267				 const GLfloat s[], const GLfloat t[],
268				 const GLfloat u[], const GLfloat lambda[],
269				 GLchan rgba[][4] )
270{
271   SWcontext *swrast = SWRAST_CONTEXT(ctx);
272
273   _swrast_validate_derived( ctx );
274   _swrast_choose_texture_sample_func( ctx, texUnit, tObj );
275
276   swrast->TextureSample[texUnit]( ctx, texUnit, tObj, n, s, t, u,
277				   lambda, rgba );
278}
279
280
281static void
282_swrast_sleep( GLcontext *ctx, GLuint new_state )
283{
284}
285
286
287static void
288_swrast_invalidate_state( GLcontext *ctx, GLuint new_state )
289{
290   SWcontext *swrast = SWRAST_CONTEXT(ctx);
291   GLuint i;
292
293   swrast->NewState |= new_state;
294
295   /* After 10 statechanges without any swrast functions being called,
296    * put the module to sleep.
297    */
298   if (++swrast->StateChanges > 10) {
299      swrast->InvalidateState = _swrast_sleep;
300      swrast->NewState = ~0;
301      new_state = ~0;
302   }
303
304   if (new_state & swrast->invalidate_triangle)
305      swrast->Triangle = _swrast_validate_triangle;
306
307   if (new_state & swrast->invalidate_line)
308      swrast->Line = _swrast_validate_line;
309
310   if (new_state & swrast->invalidate_point)
311      swrast->Point = _swrast_validate_point;
312
313   if (new_state & _SWRAST_NEW_BLEND_FUNC)
314      swrast->BlendFunc = _swrast_validate_blend_func;
315
316   if (new_state & _SWRAST_NEW_TEXTURE_SAMPLE_FUNC)
317      for (i = 0 ; i < ctx->Const.MaxTextureUnits ; i++)
318	 swrast->TextureSample[i] = _swrast_validate_texture_sample;
319
320
321   if (ctx->Visual.rgbMode) {
322      ASSERT(swrast->Driver.WriteRGBASpan);
323      ASSERT(swrast->Driver.WriteRGBSpan);
324      ASSERT(swrast->Driver.WriteMonoRGBASpan);
325      ASSERT(swrast->Driver.WriteRGBAPixels);
326      ASSERT(swrast->Driver.WriteMonoRGBAPixels);
327      ASSERT(swrast->Driver.ReadRGBASpan);
328      ASSERT(swrast->Driver.ReadRGBAPixels);
329   }
330   else {
331      ASSERT(swrast->Driver.WriteCI32Span);
332      ASSERT(swrast->Driver.WriteCI8Span);
333      ASSERT(swrast->Driver.WriteMonoCISpan);
334      ASSERT(swrast->Driver.WriteCI32Pixels);
335      ASSERT(swrast->Driver.WriteMonoCIPixels);
336      ASSERT(swrast->Driver.ReadCI32Span);
337      ASSERT(swrast->Driver.ReadCI32Pixels);
338   }
339
340}
341
342
343
344void
345_swrast_validate_derived( GLcontext *ctx )
346{
347   SWcontext *swrast = SWRAST_CONTEXT(ctx);
348
349   if (swrast->NewState)
350   {
351      if (swrast->NewState & _SWRAST_NEW_RASTERMASK)
352 	 _swrast_update_rasterflags( ctx );
353
354      if (swrast->NewState & _NEW_POLYGON)
355	 _swrast_update_polygon( ctx );
356
357      if (swrast->NewState & _NEW_HINT)
358	 _swrast_update_hint( ctx );
359
360      swrast->NewState = 0;
361      swrast->StateChanges = 0;
362      swrast->InvalidateState = _swrast_invalidate_state;
363   }
364}
365
366#define SWRAST_DEBUG 0
367
368/* Public entrypoints:  See also s_accum.c, s_bitmap.c, etc.
369 */
370void
371_swrast_Quad( GLcontext *ctx,
372	      const SWvertex *v0, const SWvertex *v1,
373              const SWvertex *v2, const SWvertex *v3 )
374{
375   if (SWRAST_DEBUG) {
376      fprintf(stderr, "_swrast_Quad\n");
377      _swrast_print_vertex( ctx, v0 );
378      _swrast_print_vertex( ctx, v1 );
379      _swrast_print_vertex( ctx, v2 );
380      _swrast_print_vertex( ctx, v3 );
381   }
382   SWRAST_CONTEXT(ctx)->Triangle( ctx, v0, v1, v3 );
383   SWRAST_CONTEXT(ctx)->Triangle( ctx, v1, v2, v3 );
384}
385
386void
387_swrast_Triangle( GLcontext *ctx, const SWvertex *v0,
388                  const SWvertex *v1, const SWvertex *v2 )
389{
390   if (SWRAST_DEBUG) {
391      fprintf(stderr, "_swrast_Triangle\n");
392      _swrast_print_vertex( ctx, v0 );
393      _swrast_print_vertex( ctx, v1 );
394      _swrast_print_vertex( ctx, v2 );
395   }
396   SWRAST_CONTEXT(ctx)->Triangle( ctx, v0, v1, v2 );
397}
398
399void
400_swrast_Line( GLcontext *ctx, const SWvertex *v0, const SWvertex *v1 )
401{
402   if (SWRAST_DEBUG) {
403      fprintf(stderr, "_swrast_Line\n");
404      _swrast_print_vertex( ctx, v0 );
405      _swrast_print_vertex( ctx, v1 );
406   }
407   SWRAST_CONTEXT(ctx)->Line( ctx, v0, v1 );
408}
409
410void
411_swrast_Point( GLcontext *ctx, const SWvertex *v0 )
412{
413   if (SWRAST_DEBUG) {
414      fprintf(stderr, "_swrast_Point\n");
415      _swrast_print_vertex( ctx, v0 );
416   }
417   SWRAST_CONTEXT(ctx)->Point( ctx, v0 );
418}
419
420void
421_swrast_InvalidateState( GLcontext *ctx, GLuint new_state )
422{
423   if (SWRAST_DEBUG) {
424      fprintf(stderr, "_swrast_InvalidateState\n");
425   }
426   SWRAST_CONTEXT(ctx)->InvalidateState( ctx, new_state );
427}
428
429void
430_swrast_ResetLineStipple( GLcontext *ctx )
431{
432   if (SWRAST_DEBUG) {
433      fprintf(stderr, "_swrast_ResetLineStipple\n");
434   }
435   SWRAST_CONTEXT(ctx)->StippleCounter = 0;
436}
437
438void
439_swrast_allow_vertex_fog( GLcontext *ctx, GLboolean value )
440{
441   if (SWRAST_DEBUG) {
442      fprintf(stderr, "_swrast_allow_vertex_fog %d\n", value);
443   }
444   SWRAST_CONTEXT(ctx)->InvalidateState( ctx, _NEW_HINT );
445   SWRAST_CONTEXT(ctx)->AllowVertexFog = value;
446}
447
448void
449_swrast_allow_pixel_fog( GLcontext *ctx, GLboolean value )
450{
451   if (SWRAST_DEBUG) {
452      fprintf(stderr, "_swrast_allow_pixel_fog %d\n", value);
453   }
454   SWRAST_CONTEXT(ctx)->InvalidateState( ctx, _NEW_HINT );
455   SWRAST_CONTEXT(ctx)->AllowPixelFog = value;
456}
457
458
459GLboolean
460_swrast_CreateContext( GLcontext *ctx )
461{
462   GLuint i;
463   SWcontext *swrast = (SWcontext *)CALLOC(sizeof(SWcontext));
464
465   if (SWRAST_DEBUG) {
466      fprintf(stderr, "_swrast_CreateContext\n");
467   }
468
469   if (!swrast)
470      return GL_FALSE;
471
472   swrast->PB = _mesa_alloc_pb();
473   if (!swrast->PB) {
474      FREE(swrast);
475      return GL_FALSE;
476   }
477
478   swrast->NewState = ~0;
479
480   swrast->choose_point = _swrast_choose_point;
481   swrast->choose_line = _swrast_choose_line;
482   swrast->choose_triangle = _swrast_choose_triangle;
483
484   swrast->invalidate_point = _SWRAST_NEW_POINT;
485   swrast->invalidate_line = _SWRAST_NEW_LINE;
486   swrast->invalidate_triangle = _SWRAST_NEW_TRIANGLE;
487
488   swrast->Point = _swrast_validate_point;
489   swrast->Line = _swrast_validate_line;
490   swrast->Triangle = _swrast_validate_triangle;
491   swrast->InvalidateState = _swrast_sleep;
492   swrast->BlendFunc = _swrast_validate_blend_func;
493
494   swrast->AllowVertexFog = GL_TRUE;
495   swrast->AllowPixelFog = GL_TRUE;
496
497   /* Optimized Accum buffer */
498   swrast->_IntegerAccumMode = GL_TRUE;
499   swrast->_IntegerAccumScaler = 0.0;
500
501
502   for (i = 0 ; i < MAX_TEXTURE_UNITS ; i++)
503      swrast->TextureSample[i] = _swrast_validate_texture_sample;
504
505   ctx->swrast_context = swrast;
506   return GL_TRUE;
507}
508
509void
510_swrast_DestroyContext( GLcontext *ctx )
511{
512   SWcontext *swrast = SWRAST_CONTEXT(ctx);
513
514   if (SWRAST_DEBUG) {
515      fprintf(stderr, "_swrast_DestroyContext\n");
516   }
517
518   FREE( swrast->PB );
519   FREE( swrast );
520
521   ctx->swrast_context = 0;
522}
523
524
525struct swrast_device_driver *
526_swrast_GetDeviceDriverReference( GLcontext *ctx )
527{
528   SWcontext *swrast = SWRAST_CONTEXT(ctx);
529   return &swrast->Driver;
530}
531
532#define SWRAST_DEBUG_VERTICES 0
533
534void
535_swrast_print_vertex( GLcontext *ctx, const SWvertex *v )
536{
537   GLuint i;
538
539   if (SWRAST_DEBUG_VERTICES) {
540      fprintf(stderr, "win %f %f %f %f\n",
541	      v->win[0], v->win[1], v->win[2], v->win[3]);
542
543      for (i = 0 ; i < ctx->Const.MaxTextureUnits ; i++)
544	 fprintf(stderr, "texcoord[%d] %f %f %f %f\n", i,
545		 v->texcoord[i][0], v->texcoord[i][1],
546		 v->texcoord[i][2], v->texcoord[i][3]);
547
548      fprintf(stderr, "color %d %d %d %d\n",
549	      v->color[0], v->color[1], v->color[2], v->color[3]);
550      fprintf(stderr, "spec %d %d %d %d\n",
551	      v->specular[0], v->specular[1], v->specular[2], v->specular[3]);
552      fprintf(stderr, "fog %f\n", v->fog);
553      fprintf(stderr, "index %d\n", v->index);
554      fprintf(stderr, "pointsize %f\n", v->pointSize);
555      fprintf(stderr, "\n");
556   }
557}
558