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triangle.c
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1/* $Id: triangle.c,v 1.31 1998/02/03 23:46:00 brianp Exp $ */
2
3/*
4 * Mesa 3-D graphics library
5 * Version: 2.4
6 * Copyright (C) 1995-1997 Brian Paul
7 *
8 * This library is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU Library General Public
10 * License as published by the Free Software Foundation; either
11 * version 2 of the License, or (at your option) any later version.
12 *
13 * This library is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 * Library General Public License for more details.
17 *
18 * You should have received a copy of the GNU Library General Public
19 * License along with this library; if not, write to the Free
20 * Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
21 */
22
23
24/*
25 * $Log: triangle.c,v $
26 * Revision 1.31 1998/02/03 23:46:00 brianp
27 * fixed a few problems with condition expressions for Amiga StormC compiler
28 *
29 * Revision 1.30 1997/08/27 01:20:05 brianp
30 * moved texture completeness test out one level (Karl Anders Oygard)
31 *
32 * Revision 1.29 1997/07/24 01:26:05 brianp
33 * changed precompiled header symbol from PCH to PC_HEADER
34 *
35 * Revision 1.28 1997/07/21 22:18:10 brianp
36 * fixed bug in compute_lambda() thanks to Magnus Lundin
37 *
38 * Revision 1.27 1997/06/23 00:40:03 brianp
39 * added a DEFARRAY/UNDEFARRAY for the Mac
40 *
41 * Revision 1.26 1997/06/20 02:51:38 brianp
42 * changed color components from GLfixed to GLubyte
43 *
44 * Revision 1.25 1997/06/03 01:38:22 brianp
45 * fixed divide by zero problem in feedback function (William Mitchell)
46 *
47 * Revision 1.24 1997/05/28 03:26:49 brianp
48 * added precompiled header (PCH) support
49 *
50 * Revision 1.23 1997/05/17 03:40:55 brianp
51 * refined textured triangle selection code (Mats Lofkvist)
52 *
53 * Revision 1.22 1997/05/03 00:51:02 brianp
54 * removed calls to gl_texturing_enabled()
55 *
56 * Revision 1.21 1997/04/14 21:38:15 brianp
57 * fixed a typo (dtdx instead of dudx) in lambda_textured_triangle()
58 *
59 * Revision 1.20 1997/04/14 02:00:39 brianp
60 * #include "texstate.h" instead of "texture.h"
61 *
62 * Revision 1.19 1997/04/12 12:27:16 brianp
63 * replaced ctx->TriangleFunc with ctx->Driver.TriangleFunc
64 *
65 * Revision 1.18 1997/04/02 03:12:06 brianp
66 * replaced ctx->IdentityTexMat with ctx->TextureMatrixType
67 *
68 * Revision 1.17 1997/03/13 03:05:31 brianp
69 * removed unused shift variable in feedback_triangle()
70 *
71 * Revision 1.16 1997/03/08 02:04:27 brianp
72 * better implementation of feedback function
73 *
74 * Revision 1.15 1997/03/04 18:54:13 brianp
75 * renamed mipmap_textured_triangle() to lambda_textured_triangle()
76 * better comments about lambda and mipmapping
77 *
78 * Revision 1.14 1997/02/20 23:47:35 brianp
79 * triangle feedback colors were wrong when using smooth shading
80 *
81 * Revision 1.13 1997/02/19 10:24:26 brianp
82 * use a GLdouble instead of a GLfloat for wwvvInv (perspective correction)
83 *
84 * Revision 1.12 1997/02/09 19:53:43 brianp
85 * now use TEXTURE_xD enable constants
86 *
87 * Revision 1.11 1997/02/09 18:51:02 brianp
88 * added GL_EXT_texture3D support
89 *
90 * Revision 1.10 1997/01/16 03:36:43 brianp
91 * added #include "texture.h"
92 *
93 * Revision 1.9 1997/01/09 19:50:49 brianp
94 * now call gl_texturing_enabled()
95 *
96 * Revision 1.8 1996/12/20 20:23:30 brianp
97 * the test for using general_textured_triangle() was wrong
98 *
99 * Revision 1.7 1996/12/12 22:37:30 brianp
100 * projective textures didn't work right
101 *
102 * Revision 1.6 1996/11/08 02:21:21 brianp
103 * added null drawing function for GL_NO_RASTER
104 *
105 * Revision 1.4 1996/09/27 01:30:37 brianp
106 * removed unneeded INTERP_ALPHA from flat_rgba_triangle()
107 *
108 * Revision 1.3 1996/09/15 14:19:16 brianp
109 * now use GLframebuffer and GLvisual
110 *
111 * Revision 1.2 1996/09/15 01:48:58 brianp
112 * removed #define NULL 0
113 *
114 * Revision 1.1 1996/09/13 01:38:16 brianp
115 * Initial revision
116 *
117 */
118
119
120/*
121 * Triangle rasterizers
122 */
123
124
125#ifdef PC_HEADER
126#include "all.h"
127#else
128#include <assert.h>
129#include <math.h>
130#include <stdio.h>
131#include "depth.h"
132#include "feedback.h"
133#include "macros.h"
134#include "span.h"
135#include "texstate.h"
136#include "triangle.h"
137#include "types.h"
138#include "vb.h"
139#endif
140
141
142/*
143 * Put triangle in feedback buffer.
144 */
145static void feedback_triangle( GLcontext *ctx,
146 GLuint v0, GLuint v1, GLuint v2, GLuint pv )
147{
148 struct vertex_buffer *VB = ctx->VB;
149 GLfloat color[4];
150 GLuint i;
151 GLfloat invRedScale = ctx->Visual->InvRedScale;
152 GLfloat invGreenScale = ctx->Visual->InvGreenScale;
153 GLfloat invBlueScale = ctx->Visual->InvBlueScale;
154 GLfloat invAlphaScale = ctx->Visual->InvAlphaScale;
155
156 FEEDBACK_TOKEN( ctx, (GLfloat) (GLint) GL_POLYGON_TOKEN );
157 FEEDBACK_TOKEN( ctx, (GLfloat) 3 ); /* three vertices */
158
159 if (ctx->Light.ShadeModel==GL_FLAT) {
160 /* flat shading - same color for each vertex */
161 color[0] = (GLfloat) VB->Color[pv][0] * invRedScale;
162 color[1] = (GLfloat) VB->Color[pv][1] * invGreenScale;
163 color[2] = (GLfloat) VB->Color[pv][2] * invBlueScale;
164 color[3] = (GLfloat) VB->Color[pv][3] * invAlphaScale;
165 }
166
167 for (i=0;i<3;i++) {
168 GLfloat x, y, z, w;
169 GLfloat tc[4];
170 GLuint v;
171 GLfloat invq;
172
173 if (i==0) v = v0;
174 else if (i==1) v = v1;
175 else v = v2;
176
177 x = VB->Win[v][0];
178 y = VB->Win[v][1];
179 z = VB->Win[v][2] / DEPTH_SCALE;
180 w = VB->Clip[v][3];
181
182 if (ctx->Light.ShadeModel==GL_SMOOTH) {
183 /* smooth shading - different color for each vertex */
184 color[0] = VB->Color[v][0] * invRedScale;
185 color[1] = VB->Color[v][1] * invGreenScale;
186 color[2] = VB->Color[v][2] * invBlueScale;
187 color[3] = VB->Color[v][3] * invAlphaScale;
188 }
189
190 invq = (VB->TexCoord[v][3]==0.0) ? 1.0 : (1.0F / VB->TexCoord[v][3]);
191 tc[0] = VB->TexCoord[v][0] * invq;
192 tc[1] = VB->TexCoord[v][1] * invq;
193 tc[2] = VB->TexCoord[v][2] * invq;
194 tc[3] = VB->TexCoord[v][3];
195
196 gl_feedback_vertex( ctx, x, y, z, w, color, (GLfloat) VB->Index[v], tc );
197 }
198}
199
200
201
202/*
203 * Put triangle in selection buffer.
204 */
205static void select_triangle( GLcontext *ctx,
206 GLuint v0, GLuint v1, GLuint v2, GLuint pv )
207{
208 struct vertex_buffer *VB = ctx->VB;
209
210 gl_update_hitflag( ctx, VB->Win[v0][2] / DEPTH_SCALE );
211 gl_update_hitflag( ctx, VB->Win[v1][2] / DEPTH_SCALE );
212 gl_update_hitflag( ctx, VB->Win[v2][2] / DEPTH_SCALE );
213}
214
215
216
217/*
218 * Render a flat-shaded color index triangle.
219 */
220static void flat_ci_triangle( GLcontext *ctx,
221 GLuint v0, GLuint v1, GLuint v2, GLuint pv )
222{
223#define INTERP_Z 1
224
225#define SETUP_CODE \
226 GLuint index = VB->Index[pv]; \
227 if (!VB->MonoColor) { \
228 /* set the color index */ \
229 (*ctx->Driver.Index)( ctx, index ); \
230 }
231
232#define INNER_LOOP( LEFT, RIGHT, Y ) \
233 { \
234 GLint i, n = RIGHT-LEFT; \
235 GLdepth zspan[MAX_WIDTH]; \
236 if (n>0) { \
237 for (i=0;i<n;i++) { \
238 zspan[i] = ffz; \
239 ffz += fdzdx; \
240 } \
241 gl_write_monoindex_span( ctx, n, LEFT, Y, \
242 zspan, index, GL_POLYGON ); \
243 } \
244 }
245
246#include "tritemp.h"
247}
248
249
250
251/*
252 * Render a smooth-shaded color index triangle.
253 */
254static void smooth_ci_triangle( GLcontext *ctx,
255 GLuint v0, GLuint v1, GLuint v2, GLuint pv )
256{
257#define INTERP_Z 1
258#define INTERP_INDEX 1
259
260#define INNER_LOOP( LEFT, RIGHT, Y ) \
261 { \
262 GLint i, n = RIGHT-LEFT; \
263 GLdepth zspan[MAX_WIDTH]; \
264 GLuint index[MAX_WIDTH]; \
265 if (n>0) { \
266 for (i=0;i<n;i++) { \
267 zspan[i] = ffz; \
268 index[i] = FixedToInt(ffi); \
269 ffz += fdzdx; \
270 ffi += fdidx; \
271 } \
272 gl_write_index_span( ctx, n, LEFT, Y, zspan, \
273 index, GL_POLYGON ); \
274 } \
275 }
276
277#include "tritemp.h"
278}
279
280
281
282/*
283 * Render a flat-shaded RGBA triangle.
284 */
285static void flat_rgba_triangle( GLcontext *ctx,
286 GLuint v0, GLuint v1, GLuint v2, GLuint pv )
287{
288#define INTERP_Z 1
289
290#define SETUP_CODE \
291 if (!VB->MonoColor) { \
292 /* set the color */ \
293 GLubyte r = VB->Color[pv][0]; \
294 GLubyte g = VB->Color[pv][1]; \
295 GLubyte b = VB->Color[pv][2]; \
296 GLubyte a = VB->Color[pv][3]; \
297 (*ctx->Driver.Color)( ctx, r, g, b, a ); \
298 }
299
300#define INNER_LOOP( LEFT, RIGHT, Y ) \
301 { \
302 GLint i, n = RIGHT-LEFT; \
303 GLdepth zspan[MAX_WIDTH]; \
304 if (n>0) { \
305 for (i=0;i<n;i++) { \
306 zspan[i] = ffz; \
307 ffz += fdzdx; \
308 } \
309 gl_write_monocolor_span( ctx, n, LEFT, Y, zspan, \
310 VB->Color[pv][0], VB->Color[pv][1],\
311 VB->Color[pv][2], VB->Color[pv][3],\
312 GL_POLYGON ); \
313 } \
314 }
315
316#include "tritemp.h"
317}
318
319
320
321/*
322 * Render a smooth-shaded RGBA triangle.
323 */
324static void smooth_rgba_triangle( GLcontext *ctx,
325 GLuint v0, GLuint v1, GLuint v2, GLuint pv )
326{
327#define INTERP_Z 1
328#define INTERP_RGB 1
329#define INTERP_ALPHA 1
330
331#define INNER_LOOP( LEFT, RIGHT, Y ) \
332 { \
333 GLint i, n = RIGHT-LEFT; \
334 GLdepth zspan[MAX_WIDTH]; \
335 GLubyte red[MAX_WIDTH], green[MAX_WIDTH]; \
336 GLubyte blue[MAX_WIDTH], alpha[MAX_WIDTH]; \
337 if (n>0) { \
338 for (i=0;i<n;i++) { \
339 zspan[i] = ffz; \
340 red[i] = FixedToInt(ffr); \
341 green[i] = FixedToInt(ffg); \
342 blue[i] = FixedToInt(ffb); \
343 alpha[i] = FixedToInt(ffa); \
344 ffz += fdzdx; \
345 ffr += fdrdx; \
346 ffg += fdgdx; \
347 ffb += fdbdx; \
348 ffa += fdadx; \
349 } \
350 gl_write_color_span( ctx, n, LEFT, Y, zspan, \
351 red, green, blue, alpha, \
352 GL_POLYGON ); \
353 } \
354 }
355
356#include "tritemp.h"
357}
358
359
360
361/*
362 * Render an RGB, GL_DECAL, textured triangle.
363 * Interpolate S,T only w/out mipmapping or perspective correction.
364 */
365static void simple_textured_triangle( GLcontext *ctx, GLuint v0, GLuint v1,
366 GLuint v2, GLuint pv )
367{
368#define INTERP_ST 1
369#define S_SCALE twidth
370#define T_SCALE theight
371#define SETUP_CODE \
372 GLfloat twidth = (GLfloat) ctx->Texture.Current2D->Image[0]->Width; \
373 GLfloat theight = (GLfloat) ctx->Texture.Current2D->Image[0]->Height;\
374 GLint twidth_log2 = ctx->Texture.Current2D->Image[0]->WidthLog2; \
375 GLubyte *texture = ctx->Texture.Current2D->Image[0]->Data; \
376 GLint smask = ctx->Texture.Current2D->Image[0]->Width - 1; \
377 GLint tmask = ctx->Texture.Current2D->Image[0]->Height - 1;
378
379#define INNER_LOOP( LEFT, RIGHT, Y ) \
380 { \
381 GLint i, n = RIGHT-LEFT; \
382 GLubyte red[MAX_WIDTH], green[MAX_WIDTH]; \
383 GLubyte blue[MAX_WIDTH], alpha[MAX_WIDTH]; \
384 if (n>0) { \
385 for (i=0;i<n;i++) { \
386 GLint s = FixedToInt(ffs) & smask; \
387 GLint t = FixedToInt(fft) & tmask; \
388 GLint pos = (t << twidth_log2) + s; \
389 pos = pos + pos + pos; /* multiply by 3 */ \
390 red[i] = texture[pos]; \
391 green[i] = texture[pos+1]; \
392 blue[i] = texture[pos+2]; \
393 alpha[i] = 255; \
394 ffs += fdsdx; \
395 fft += fdtdx; \
396 } \
397 (*ctx->Driver.WriteColorSpan)( ctx, n, LEFT, Y, \
398 red, green, blue, alpha, NULL ); \
399 } \
400 }
401
402#include "tritemp.h"
403}
404
405
406
407/*
408 * Render an RGB, GL_DECAL, textured triangle.
409 * Interpolate S,T, GL_LESS depth test, w/out mipmapping or
410 * perspective correction.
411 */
412static void simple_z_textured_triangle( GLcontext *ctx, GLuint v0, GLuint v1,
413 GLuint v2, GLuint pv )
414{
415#define INTERP_Z 1
416#define INTERP_ST 1
417#define S_SCALE twidth
418#define T_SCALE theight
419#define SETUP_CODE \
420 GLfloat twidth = (GLfloat) ctx->Texture.Current2D->Image[0]->Width; \
421 GLfloat theight = (GLfloat) ctx->Texture.Current2D->Image[0]->Height;\
422 GLint twidth_log2 = ctx->Texture.Current2D->Image[0]->WidthLog2; \
423 GLubyte *texture = ctx->Texture.Current2D->Image[0]->Data; \
424 GLint smask = ctx->Texture.Current2D->Image[0]->Width - 1; \
425 GLint tmask = ctx->Texture.Current2D->Image[0]->Height - 1;
426
427#define INNER_LOOP( LEFT, RIGHT, Y ) \
428 { \
429 GLint i, n = RIGHT-LEFT; \
430 GLubyte red[MAX_WIDTH], green[MAX_WIDTH]; \
431 GLubyte blue[MAX_WIDTH], alpha[MAX_WIDTH]; \
432 GLubyte mask[MAX_WIDTH]; \
433 if (n>0) { \
434 for (i=0;i<n;i++) { \
435 GLdepth z = ffz; \
436 if (z < zRow[i]) { \
437 GLint s = FixedToInt(ffs) & smask; \
438 GLint t = FixedToInt(fft) & tmask; \
439 GLint pos = (t << twidth_log2) + s; \
440 pos = pos + pos + pos; /* multiply by 3 */\
441 red[i] = texture[pos]; \
442 green[i] = texture[pos+1]; \
443 blue[i] = texture[pos+2]; \
444 alpha[i] = 255; \
445 zRow[i] = z; \
446 mask[i] = 1; \
447 } \
448 else { \
449 mask[i] = 0; \
450 } \
451 ffz += fdzdx; \
452 ffs += fdsdx; \
453 fft += fdtdx; \
454 } \
455 (*ctx->Driver.WriteColorSpan)( ctx, n, LEFT, Y, \
456 red, green, blue, alpha, mask ); \
457 } \
458 }
459
460#include "tritemp.h"
461}
462
463
464
465/*
466 * Render a smooth-shaded, textured, RGBA triangle.
467 * Interpolate S,T,U with perspective correction, w/out mipmapping.
468 * Note: we use texture coordinates S,T,U,V instead of S,T,R,Q because
469 * R is already used for red.
470 */
471static void general_textured_triangle( GLcontext *ctx, GLuint v0, GLuint v1,
472 GLuint v2, GLuint pv )
473{
474#define INTERP_Z 1
475#define INTERP_RGB 1
476#define INTERP_ALPHA 1
477#define INTERP_STW 1
478#define INTERP_UV 1
479#define SETUP_CODE \
480 GLboolean flat_shade = (ctx->Light.ShadeModel==GL_FLAT); \
481 GLint r, g, b, a; \
482 if (flat_shade) { \
483 r = VB->Color[pv][0]; \
484 g = VB->Color[pv][1]; \
485 b = VB->Color[pv][2]; \
486 a = VB->Color[pv][3]; \
487 }
488#define INNER_LOOP( LEFT, RIGHT, Y ) \
489 { \
490 GLint i, n = RIGHT-LEFT; \
491 GLdepth zspan[MAX_WIDTH]; \
492 GLubyte red[MAX_WIDTH], green[MAX_WIDTH]; \
493 GLubyte blue[MAX_WIDTH], alpha[MAX_WIDTH]; \
494 GLfloat s[MAX_WIDTH], t[MAX_WIDTH], u[MAX_WIDTH]; \
495 if (n>0) { \
496 if (flat_shade) { \
497 for (i=0;i<n;i++) { \
498 GLdouble wwvvInv = 1.0 / (ww*vv); \
499 zspan[i] = ffz; \
500 red[i] = r; \
501 green[i] = g; \
502 blue[i] = b; \
503 alpha[i] = a; \
504 s[i] = ss*wwvvInv; \
505 t[i] = tt*wwvvInv; \
506 u[i] = uu*wwvvInv; \
507 ffz += fdzdx; \
508 ss += dsdx; \
509 tt += dtdx; \
510 uu += dudx; \
511 vv += dvdx; \
512 ww += dwdx; \
513 } \
514 } \
515 else { \
516 for (i=0;i<n;i++) { \
517 GLdouble wwvvInv = 1.0 / (ww*vv); \
518 zspan[i] = ffz; \
519 red[i] = FixedToInt(ffr); \
520 green[i] = FixedToInt(ffg); \
521 blue[i] = FixedToInt(ffb); \
522 alpha[i] = FixedToInt(ffa); \
523 s[i] = ss*wwvvInv; \
524 t[i] = tt*wwvvInv; \
525 u[i] = uu*wwvvInv; \
526 ffz += fdzdx; \
527 ffr += fdrdx; \
528 ffg += fdgdx; \
529 ffb += fdbdx; \
530 ffa += fdadx; \
531 ss += dsdx; \
532 tt += dtdx; \
533 uu += dudx; \
534 ww += dwdx; \
535 vv += dvdx; \
536 } \
537 } \
538 gl_write_texture_span( ctx, n, LEFT, Y, zspan, \
539 s, t, u, NULL, \
540 red, green, blue, alpha, \
541 GL_POLYGON ); \
542 } \
543 }
544
545#include "tritemp.h"
546}
547
548
549
550/*
551 * Compute the lambda value (texture level value) for a fragment.
552 */
553static GLfloat compute_lambda( GLfloat s, GLfloat t,
554 GLfloat dsdx, GLfloat dsdy,
555 GLfloat dtdx, GLfloat dtdy,
556 GLfloat w, GLfloat dwdx, GLfloat dwdy,
557 GLfloat width, GLfloat height )
558{
559 /* TODO: this function can probably be optimized a bit */
560 GLfloat invw = 1.0 / w;
561 GLfloat dudx, dudy, dvdx, dvdy;
562 GLfloat r1, r2, rho2;
563
564 dudx = (dsdx - s*dwdx) * invw * width;
565 dudy = (dsdy - s*dwdy) * invw * width;
566 dvdx = (dtdx - t*dwdx) * invw * height;
567 dvdy = (dtdy - t*dwdy) * invw * height;
568
569 r1 = dudx * dudx + dudy * dudy;
570 r2 = dvdx * dvdx + dvdy * dvdy;
571
572 /* rho2 = MAX2(r1,r2); */
573 rho2 = r1 + r2;
574 if (rho2 <= 0.0F) {
575 return 0.0F;
576 }
577 else {
578 /* return log base 2 of rho */
579 return log(rho2) * 1.442695 * 0.5; /* 1.442695 = 1/log(2) */
580 }
581}
582
583
584
585/*
586 * Render a smooth-shaded, textured, RGBA triangle.
587 * Interpolate S,T,U with perspective correction and compute lambda for
588 * each fragment. Lambda is used to determine whether to use the
589 * minification or magnification filter. If minification and using
590 * mipmaps, lambda is also used to select the texture level of detail.
591 */
592static void lambda_textured_triangle( GLcontext *ctx, GLuint v0, GLuint v1,
593 GLuint v2, GLuint pv )
594{
595#define INTERP_Z 1
596#define INTERP_RGB 1
597#define INTERP_ALPHA 1
598#define INTERP_STW 1
599#define INTERP_UV 1
600
601#define SETUP_CODE \
602 GLboolean flat_shade = (ctx->Light.ShadeModel==GL_FLAT); \
603 GLint r, g, b, a; \
604 GLfloat twidth, theight; \
605 if (ctx->Texture.Enabled & TEXTURE_2D) { \
606 twidth = (GLfloat) ctx->Texture.Current2D->Image[0]->Width; \
607 theight = (GLfloat) ctx->Texture.Current2D->Image[0]->Height; \
608 } \
609 else { \
610 twidth = (GLfloat) ctx->Texture.Current1D->Image[0]->Width; \
611 theight = 1.0; \
612 } \
613 if (flat_shade) { \
614 r = VB->Color[pv][0]; \
615 g = VB->Color[pv][1]; \
616 b = VB->Color[pv][2]; \
617 a = VB->Color[pv][3]; \
618 }
619
620#define INNER_LOOP( LEFT, RIGHT, Y ) \
621 { \
622 GLint i, n = RIGHT-LEFT; \
623 GLdepth zspan[MAX_WIDTH]; \
624 GLubyte red[MAX_WIDTH], green[MAX_WIDTH]; \
625 GLubyte blue[MAX_WIDTH], alpha[MAX_WIDTH]; \
626 GLfloat s[MAX_WIDTH], t[MAX_WIDTH], u[MAX_WIDTH]; \
627 DEFARRAY(GLfloat,lambda,MAX_WIDTH); \
628 if (n>0) { \
629 if (flat_shade) { \
630 for (i=0;i<n;i++) { \
631 GLdouble wwvvInv = 1.0 / (ww*vv); \
632 zspan[i] = ffz; \
633 red[i] = r; \
634 green[i] = g; \
635 blue[i] = b; \
636 alpha[i] = a; \
637 s[i] = ss*wwvvInv; \
638 t[i] = tt*wwvvInv; \
639 u[i] = uu*wwvvInv; \
640 lambda[i] = compute_lambda( s[i], t[i], \
641 dsdx, dsdy, \
642 dtdx, dtdy, ww, \
643 dwdx, dwdy, \
644 twidth, theight ); \
645 ffz += fdzdx; \
646 ss += dsdx; \
647 tt += dtdx; \
648 uu += dudx; \
649 vv += dvdx; \
650 ww += dwdx; \
651 } \
652 } \
653 else { \
654 for (i=0;i<n;i++) { \
655 GLdouble wwvvInv = 1.0 / (ww*vv); \
656 zspan[i] = ffz; \
657 red[i] = FixedToInt(ffr); \
658 green[i] = FixedToInt(ffg); \
659 blue[i] = FixedToInt(ffb); \
660 alpha[i] = FixedToInt(ffa); \
661 s[i] = ss*wwvvInv; \
662 t[i] = tt*wwvvInv; \
663 u[i] = uu*wwvvInv; \
664 lambda[i] = compute_lambda( s[i], t[i], \
665 dsdx, dsdy, \
666 dtdx, dtdy, ww, \
667 dwdx, dwdy, \
668 twidth, theight ); \
669 ffz += fdzdx; \
670 ffr += fdrdx; \
671 ffg += fdgdx; \
672 ffb += fdbdx; \
673 ffa += fdadx; \
674 ss += dsdx; \
675 tt += dtdx; \
676 uu += dudx; \
677 vv += dvdx; \
678 ww += dwdx; \
679 } \
680 } \
681 gl_write_texture_span( ctx, n, LEFT, Y, zspan, \
682 s, t, u, lambda, \
683 red, green, blue, alpha, \
684 GL_POLYGON ); \
685 } \
686 UNDEFARRAY(lambda); \
687 }
688
689#include "tritemp.h"
690}
691
692
693
694/*
695 * Null rasterizer for measuring transformation speed.
696 */
697static void null_triangle( GLcontext *ctx, GLuint v0, GLuint v1,
698 GLuint v2, GLuint pv )
699{
700}
701
702
703
704/*
705 * Determine which triangle rendering function to use given the current
706 * rendering context.
707 */
708void gl_set_triangle_function( GLcontext *ctx )
709{
710 GLboolean rgbmode = ctx->Visual->RGBAflag;
711
712 if (ctx->RenderMode==GL_RENDER) {
713 if (ctx->NoRaster) {
714 ctx->Driver.TriangleFunc = null_triangle;
715 return;
716 }
717 if (ctx->Driver.TriangleFunc) {
718 /* Device driver will draw triangles. */
719 }
720 else if (ctx->Texture.Enabled
721 && ctx->Texture.Current
722 && ctx->Texture.Current->Complete) {
723 if ( (ctx->Texture.Enabled==TEXTURE_2D)
724 && ctx->Texture.Current2D->MinFilter==GL_NEAREST
725 && ctx->Texture.Current2D->MagFilter==GL_NEAREST
726 && ctx->Texture.Current2D->WrapS==GL_REPEAT
727 && ctx->Texture.Current2D->WrapT==GL_REPEAT
728 && ctx->Texture.Current2D->Image[0]->Format==GL_RGB
729 && ctx->Texture.Current2D->Image[0]->Border==0
730 && (ctx->Texture.EnvMode==GL_DECAL
731 || ctx->Texture.EnvMode==GL_REPLACE)
732 && ctx->Hint.PerspectiveCorrection==GL_FASTEST
733 && ctx->TextureMatrixType==MATRIX_IDENTITY
734 && ((ctx->RasterMask==DEPTH_BIT
735 && ctx->Depth.Func==GL_LESS
736 && ctx->Depth.Mask==GL_TRUE)
737 || ctx->RasterMask==0)
738 && ctx->Polygon.StippleFlag==GL_FALSE
739 && ctx->Visual->EightBitColor) {
740 if (ctx->RasterMask==DEPTH_BIT) {
741 ctx->Driver.TriangleFunc = simple_z_textured_triangle;
742 }
743 else {
744 ctx->Driver.TriangleFunc = simple_textured_triangle;
745 }
746 }
747 else {
748 GLboolean needLambda = GL_TRUE;
749 /* if mag filter == min filter we're not mipmapping */
750 if (ctx->Texture.Enabled & TEXTURE_2D) {
751 if (ctx->Texture.Current2D->MinFilter==
752 ctx->Texture.Current2D->MagFilter) {
753 needLambda = GL_FALSE;
754 }
755 }
756 else if (ctx->Texture.Enabled & TEXTURE_1D) {
757 if (ctx->Texture.Current1D->MinFilter==
758 ctx->Texture.Current1D->MagFilter) {
759 needLambda = GL_FALSE;
760 }
761 }
762 if (needLambda)
763 ctx->Driver.TriangleFunc = lambda_textured_triangle;
764 else
765 ctx->Driver.TriangleFunc = general_textured_triangle;
766 }
767 }
768 else {
769 if (ctx->Light.ShadeModel==GL_SMOOTH) {
770 /* smooth shaded, no texturing, stippled or some raster ops */
771 if (rgbmode)
772 ctx->Driver.TriangleFunc = smooth_rgba_triangle;
773 else
774 ctx->Driver.TriangleFunc = smooth_ci_triangle;
775 }
776 else {
777 /* flat shaded, no texturing, stippled or some raster ops */
778 if (rgbmode)
779 ctx->Driver.TriangleFunc = flat_rgba_triangle;
780 else
781 ctx->Driver.TriangleFunc = flat_ci_triangle;
782 }
783 }
784 }
785 else if (ctx->RenderMode==GL_FEEDBACK) {
786 ctx->Driver.TriangleFunc = feedback_triangle;
787 }
788 else {
789 /* GL_SELECT mode */
790 ctx->Driver.TriangleFunc = select_triangle;
791 }
792}
793
DEPTH_SCALE
#define DEPTH_SCALE
Definition: config.h:146
TEXTURE_1D
#define TEXTURE_1D
Definition: types.h:894
DEPTH_BIT
#define DEPTH_BIT
Definition: types.h:1217
TEXTURE_2D
#define TEXTURE_2D
Definition: types.h:895
MATRIX_IDENTITY
#define MATRIX_IDENTITY
Definition: types.h:1243
gl_feedback_vertex
void gl_feedback_vertex(GLcontext *ctx, GLfloat x, GLfloat y, GLfloat z, GLfloat w, const GLfloat color[4], GLfloat index, const GLfloat texcoord[4])
Definition: feedback.c:161
gl_update_hitflag
void gl_update_hitflag(GLcontext *ctx, GLfloat z)
Definition: feedback.c:240
FEEDBACK_TOKEN
#define FEEDBACK_TOKEN(CTX, T)
Definition: feedback.h:39
GL_RENDER
#define GL_RENDER
Definition: gl.h:388
GL_TRUE
#define GL_TRUE
Definition: gl.h:174
GL_FASTEST
#define GL_FASTEST
Definition: gl.h:584
GL_LESS
#define GL_LESS
Definition: gl.h:294
GLfloat
float GLfloat
Definition: gl.h:161
x
GLint GLint GLint GLint GLint x
Definition: gl.h:1548
v
const GLdouble * v
Definition: gl.h:2040
GL_SMOOTH
#define GL_SMOOTH
Definition: gl.h:339
s
GLdouble s
Definition: gl.h:2039
GL_FEEDBACK
#define GL_FEEDBACK
Definition: gl.h:387
GLuint
unsigned int GLuint
Definition: gl.h:159
GL_RGB
#define GL_RGB
Definition: gl.h:502
y
GLint GLint GLint GLint GLint GLint y
Definition: gl.h:1548
GL_NEAREST
#define GL_NEAREST
Definition: gl.h:678
GL_POLYGON_TOKEN
#define GL_POLYGON_TOKEN
Definition: gl.h:400
GL_DECAL
#define GL_DECAL
Definition: gl.h:676
GL_REPEAT
#define GL_REPEAT
Definition: gl.h:679
height
GLint GLint GLsizei GLsizei height
Definition: gl.h:1546
GL_FALSE
#define GL_FALSE
Definition: gl.h:173
t
GLdouble GLdouble t
Definition: gl.h:2047
GLint
int GLint
Definition: gl.h:156
width
GLint GLint GLsizei width
Definition: gl.h:1546
GL_FLAT
#define GL_FLAT
Definition: gl.h:338
GL_REPLACE
#define GL_REPLACE
Definition: gl.h:460
GLboolean
unsigned char GLboolean
Definition: gl.h:151
color
GLuint color
Definition: glext.h:6243
tc
const GLfloat * tc
Definition: glext.h:8925
v0
GLfloat v0
Definition: glext.h:6061
v1
GLfloat GLfloat v1
Definition: glext.h:6062
v2
GLfloat GLfloat GLfloat v2
Definition: glext.h:6063
w
GLubyte GLubyte GLubyte GLubyte w
Definition: glext.h:6102
z
GLdouble GLdouble z
Definition: glext.h:5874
i
GLsizei GLenum const GLvoid GLsizei GLenum GLbyte GLbyte GLbyte GLdouble GLdouble GLdouble GLfloat GLfloat GLfloat GLint GLint GLint GLshort GLshort GLshort GLubyte GLubyte GLubyte GLuint GLuint GLuint GLushort GLushort GLushort GLbyte GLbyte GLbyte GLbyte GLdouble GLdouble GLdouble GLdouble GLfloat GLfloat GLfloat GLfloat GLint GLint GLint GLint GLshort GLshort GLshort GLshort GLubyte GLubyte GLubyte GLubyte GLuint GLuint GLuint GLuint GLushort GLushort GLushort GLushort GLboolean const GLdouble const GLfloat const GLint const GLshort const GLbyte const GLdouble const GLfloat const GLint const GLshort const GLdouble const GLfloat const GLint const GLshort const GLdouble const GLfloat const GLint const GLshort const GLdouble const GLfloat const GLint const GLshort const GLdouble const GLdouble const GLfloat const GLfloat const GLint const GLint const GLshort const GLshort const GLdouble const GLfloat const GLint const GLshort const GLdouble const GLfloat const GLint const GLshort const GLdouble const GLfloat const GLint const GLshort const GLdouble const GLfloat const GLint const GLshort const GLdouble const GLfloat const GLint const GLshort const GLdouble const GLfloat const GLint const GLshort const GLdouble const GLfloat const GLint const GLshort GLenum GLenum GLenum GLfloat GLenum GLint GLenum GLenum GLenum GLfloat GLenum GLenum GLint GLenum GLfloat GLenum GLint GLint GLushort GLenum GLenum GLfloat GLenum GLenum GLint GLfloat const GLubyte GLenum GLenum GLenum const GLfloat GLenum GLenum const GLint GLenum GLint GLint GLsizei GLsizei GLint GLenum GLenum const GLvoid GLenum GLenum const GLfloat GLenum GLenum const GLint GLenum GLenum const GLdouble GLenum GLenum const GLfloat GLenum GLenum const GLint GLsizei GLuint GLfloat GLuint GLbitfield GLfloat GLint GLuint GLboolean GLenum GLfloat GLenum GLbitfield GLenum GLfloat GLfloat GLint GLint const GLfloat GLenum GLfloat GLfloat GLint GLint GLfloat GLfloat GLint GLint const GLfloat GLint GLfloat GLfloat GLint GLfloat GLfloat GLint GLfloat GLfloat const GLdouble const GLfloat const GLdouble const GLfloat GLint i
Definition: glfuncs.h:248
r1
static DNS_RECORDW r1
Definition: record.c:37
r2
static DNS_RECORDW r2
Definition: record.c:38
log
#define log(outFile, fmt,...)
Definition: util.h:15
gl_context
Definition: types.h:1263
vertex_buffer
Definition: vb.h:99
flat_rgba_triangle
static void flat_rgba_triangle(GLcontext *ctx, GLuint v0, GLuint v1, GLuint v2, GLuint pv)
Definition: triangle.c:285
smooth_rgba_triangle
static void smooth_rgba_triangle(GLcontext *ctx, GLuint v0, GLuint v1, GLuint v2, GLuint pv)
Definition: triangle.c:324
simple_textured_triangle
static void simple_textured_triangle(GLcontext *ctx, GLuint v0, GLuint v1, GLuint v2, GLuint pv)
Definition: triangle.c:365
flat_ci_triangle
static void flat_ci_triangle(GLcontext *ctx, GLuint v0, GLuint v1, GLuint v2, GLuint pv)
Definition: triangle.c:220
feedback_triangle
static void feedback_triangle(GLcontext *ctx, GLuint v0, GLuint v1, GLuint v2, GLuint pv)
Definition: triangle.c:145
simple_z_textured_triangle
static void simple_z_textured_triangle(GLcontext *ctx, GLuint v0, GLuint v1, GLuint v2, GLuint pv)
Definition: triangle.c:412
null_triangle
static void null_triangle(GLcontext *ctx, GLuint v0, GLuint v1, GLuint v2, GLuint pv)
Definition: triangle.c:697
smooth_ci_triangle
static void smooth_ci_triangle(GLcontext *ctx, GLuint v0, GLuint v1, GLuint v2, GLuint pv)
Definition: triangle.c:254
lambda_textured_triangle
static void lambda_textured_triangle(GLcontext *ctx, GLuint v0, GLuint v1, GLuint v2, GLuint pv)
Definition: triangle.c:592
compute_lambda
static GLfloat compute_lambda(GLfloat s, GLfloat t, GLfloat dsdx, GLfloat dsdy, GLfloat dtdx, GLfloat dtdy, GLfloat w, GLfloat dwdx, GLfloat dwdy, GLfloat width, GLfloat height)
Definition: triangle.c:553
select_triangle
static void select_triangle(GLcontext *ctx, GLuint v0, GLuint v1, GLuint v2, GLuint pv)
Definition: triangle.c:205
general_textured_triangle
static void general_textured_triangle(GLcontext *ctx, GLuint v0, GLuint v1, GLuint v2, GLuint pv)
Definition: triangle.c:471
gl_set_triangle_function
void gl_set_triangle_function(GLcontext *ctx)
Definition: triangle.c:708
VB
struct vertex_buffer * VB
Definition: tritemp.h:139