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GL_SGI_texture_color_table extension (Eric Plante)
[mesa.git] / src / mesa / swrast / s_triangle.c
1 /* $Id: s_triangle.c,v 1.66 2002/12/18 15:02:19 brianp Exp $ */
2
3 /*
4 * Mesa 3-D graphics library
5 * Version: 5.1
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
27
28 /*
29 * When the device driver doesn't implement triangle rasterization it
30 * can hook in _swrast_Triangle, which eventually calls one of these
31 * functions to draw triangles.
32 */
33
34 #include "glheader.h"
35 #include "context.h"
36 #include "colormac.h"
37 #include "imports.h"
38 #include "macros.h"
39 #include "mmath.h"
40 #include "texformat.h"
41 #include "teximage.h"
42 #include "texstate.h"
43
44 #include "s_aatriangle.h"
45 #include "s_context.h"
46 #include "s_depth.h"
47 #include "s_feedback.h"
48 #include "s_span.h"
49 #include "s_triangle.h"
50
51
52 /*
53 * Just used for feedback mode.
54 */
55 GLboolean _mesa_cull_triangle( GLcontext *ctx,
56 const SWvertex *v0,
57 const SWvertex *v1,
58 const SWvertex *v2 )
59 {
60 GLfloat ex = v1->win[0] - v0->win[0];
61 GLfloat ey = v1->win[1] - v0->win[1];
62 GLfloat fx = v2->win[0] - v0->win[0];
63 GLfloat fy = v2->win[1] - v0->win[1];
64 GLfloat c = ex*fy-ey*fx;
65
66 if (c * SWRAST_CONTEXT(ctx)->_backface_sign > 0)
67 return 0;
68
69 return 1;
70 }
71
72
73
74 /*
75 * Render a flat-shaded color index triangle.
76 */
77 #define NAME flat_ci_triangle
78 #define INTERP_Z 1
79 #define INTERP_FOG 1
80 #define SETUP_CODE \
81 span.interpMask |= SPAN_INDEX; \
82 span.index = IntToFixed(v2->index); \
83 span.indexStep = 0;
84 #define RENDER_SPAN( span ) _mesa_write_index_span(ctx, &span);
85 #include "s_tritemp.h"
86
87
88
89 /*
90 * Render a smooth-shaded color index triangle.
91 */
92 #define NAME smooth_ci_triangle
93 #define INTERP_Z 1
94 #define INTERP_FOG 1
95 #define INTERP_INDEX 1
96 #define RENDER_SPAN( span ) _mesa_write_index_span(ctx, &span);
97 #include "s_tritemp.h"
98
99
100
101 /*
102 * Render a flat-shaded RGBA triangle.
103 */
104 #define NAME flat_rgba_triangle
105 #define INTERP_Z 1
106 #define INTERP_FOG 1
107 #define DEPTH_TYPE DEFAULT_SOFTWARE_DEPTH_TYPE
108 #define SETUP_CODE \
109 ASSERT(ctx->Texture._EnabledUnits == 0); \
110 ASSERT(ctx->Light.ShadeModel==GL_FLAT); \
111 span.interpMask |= SPAN_RGBA; \
112 span.red = ChanToFixed(v2->color[0]); \
113 span.green = ChanToFixed(v2->color[1]); \
114 span.blue = ChanToFixed(v2->color[2]); \
115 span.alpha = ChanToFixed(v2->color[3]); \
116 span.redStep = 0; \
117 span.greenStep = 0; \
118 span.blueStep = 0; \
119 span.alphaStep = 0;
120 #define RENDER_SPAN( span ) _mesa_write_rgba_span(ctx, &span);
121 #include "s_tritemp.h"
122
123
124
125 /*
126 * Render a smooth-shaded RGBA triangle.
127 */
128 #define NAME smooth_rgba_triangle
129 #define INTERP_Z 1
130 #define INTERP_FOG 1
131 #define DEPTH_TYPE DEFAULT_SOFTWARE_DEPTH_TYPE
132 #define INTERP_RGB 1
133 #define INTERP_ALPHA 1
134 #define SETUP_CODE \
135 { \
136 /* texturing must be off */ \
137 ASSERT(ctx->Texture._EnabledUnits == 0); \
138 ASSERT(ctx->Light.ShadeModel==GL_SMOOTH); \
139 }
140 #define RENDER_SPAN( span ) _mesa_write_rgba_span(ctx, &span);
141 #include "s_tritemp.h"
142
143
144
145 /*
146 * Render an RGB, GL_DECAL, textured triangle.
147 * Interpolate S,T only w/out mipmapping or perspective correction.
148 *
149 * No fog.
150 */
151 #define NAME simple_textured_triangle
152 #define INTERP_INT_TEX 1
153 #define S_SCALE twidth
154 #define T_SCALE theight
155
156 #define SETUP_CODE \
157 SWcontext *swrast = SWRAST_CONTEXT(ctx); \
158 struct gl_texture_object *obj = ctx->Texture.Unit[0].Current2D; \
159 const GLint b = obj->BaseLevel; \
160 const GLfloat twidth = (GLfloat) obj->Image[b]->Width; \
161 const GLfloat theight = (GLfloat) obj->Image[b]->Height; \
162 const GLint twidth_log2 = obj->Image[b]->WidthLog2; \
163 const GLchan *texture = (const GLchan *) obj->Image[b]->Data; \
164 const GLint smask = obj->Image[b]->Width - 1; \
165 const GLint tmask = obj->Image[b]->Height - 1; \
166 if (!texture) { \
167 /* this shouldn't happen */ \
168 return; \
169 }
170
171 #define RENDER_SPAN( span ) \
172 GLuint i; \
173 span.intTex[0] -= FIXED_HALF; /* off-by-one error? */ \
174 span.intTex[1] -= FIXED_HALF; \
175 for (i = 0; i < span.end; i++) { \
176 GLint s = FixedToInt(span.intTex[0]) & smask; \
177 GLint t = FixedToInt(span.intTex[1]) & tmask; \
178 GLint pos = (t << twidth_log2) + s; \
179 pos = pos + pos + pos; /* multiply by 3 */ \
180 span.array->rgb[i][RCOMP] = texture[pos]; \
181 span.array->rgb[i][GCOMP] = texture[pos+1]; \
182 span.array->rgb[i][BCOMP] = texture[pos+2]; \
183 span.intTex[0] += span.intTexStep[0]; \
184 span.intTex[1] += span.intTexStep[1]; \
185 } \
186 (*swrast->Driver.WriteRGBSpan)(ctx, span.end, span.x, span.y, \
187 (CONST GLchan (*)[3]) span.array->rgb,\
188 NULL );
189 #include "s_tritemp.h"
190
191
192
193 /*
194 * Render an RGB, GL_DECAL, textured triangle.
195 * Interpolate S,T, GL_LESS depth test, w/out mipmapping or
196 * perspective correction.
197 *
198 * No fog.
199 */
200 #define NAME simple_z_textured_triangle
201 #define INTERP_Z 1
202 #define DEPTH_TYPE DEFAULT_SOFTWARE_DEPTH_TYPE
203 #define INTERP_INT_TEX 1
204 #define S_SCALE twidth
205 #define T_SCALE theight
206
207 #define SETUP_CODE \
208 SWcontext *swrast = SWRAST_CONTEXT(ctx); \
209 struct gl_texture_object *obj = ctx->Texture.Unit[0].Current2D; \
210 const GLint b = obj->BaseLevel; \
211 const GLfloat twidth = (GLfloat) obj->Image[b]->Width; \
212 const GLfloat theight = (GLfloat) obj->Image[b]->Height; \
213 const GLint twidth_log2 = obj->Image[b]->WidthLog2; \
214 const GLchan *texture = (const GLchan *) obj->Image[b]->Data; \
215 const GLint smask = obj->Image[b]->Width - 1; \
216 const GLint tmask = obj->Image[b]->Height - 1; \
217 if (!texture) { \
218 /* this shouldn't happen */ \
219 return; \
220 }
221
222 #define RENDER_SPAN( span ) \
223 GLuint i; \
224 span.intTex[0] -= FIXED_HALF; /* off-by-one error? */ \
225 span.intTex[1] -= FIXED_HALF; \
226 for (i = 0; i < span.end; i++) { \
227 const GLdepth z = FixedToDepth(span.z); \
228 if (z < zRow[i]) { \
229 GLint s = FixedToInt(span.intTex[0]) & smask; \
230 GLint t = FixedToInt(span.intTex[1]) & tmask; \
231 GLint pos = (t << twidth_log2) + s; \
232 pos = pos + pos + pos; /* multiply by 3 */ \
233 span.array->rgb[i][RCOMP] = texture[pos]; \
234 span.array->rgb[i][GCOMP] = texture[pos+1]; \
235 span.array->rgb[i][BCOMP] = texture[pos+2]; \
236 zRow[i] = z; \
237 span.array->mask[i] = 1; \
238 } \
239 else { \
240 span.array->mask[i] = 0; \
241 } \
242 span.intTex[0] += span.intTexStep[0]; \
243 span.intTex[1] += span.intTexStep[1]; \
244 span.z += span.zStep; \
245 } \
246 (*swrast->Driver.WriteRGBSpan)(ctx, span.end, span.x, span.y, \
247 (CONST GLchan (*)[3]) span.array->rgb,\
248 span.array->mask );
249 #include "s_tritemp.h"
250
251
252
253 #if CHAN_TYPE != GL_FLOAT
254
255 struct affine_info
256 {
257 GLenum filter;
258 GLenum format;
259 GLenum envmode;
260 GLint smask, tmask;
261 GLint twidth_log2;
262 const GLchan *texture;
263 GLfixed er, eg, eb, ea;
264 GLint tbytesline, tsize;
265 };
266
267
268 /* This function can handle GL_NEAREST or GL_LINEAR sampling of 2D RGB or RGBA
269 * textures with GL_REPLACE, GL_MODULATE, GL_BLEND, GL_DECAL or GL_ADD
270 * texture env modes.
271 */
272 static INLINE void
273 affine_span(GLcontext *ctx, struct sw_span *span,
274 struct affine_info *info)
275 {
276 GLchan sample[4]; /* the filtered texture sample */
277
278 /* Instead of defining a function for each mode, a test is done
279 * between the outer and inner loops. This is to reduce code size
280 * and complexity. Observe that an optimizing compiler kills
281 * unused variables (for instance tf,sf,ti,si in case of GL_NEAREST).
282 */
283
284 #define NEAREST_RGB \
285 sample[RCOMP] = tex00[RCOMP]; \
286 sample[GCOMP] = tex00[GCOMP]; \
287 sample[BCOMP] = tex00[BCOMP]; \
288 sample[ACOMP] = CHAN_MAX
289
290 #define LINEAR_RGB \
291 sample[RCOMP] = (ti * (si * tex00[0] + sf * tex01[0]) + \
292 tf * (si * tex10[0] + sf * tex11[0])) >> 2 * FIXED_SHIFT; \
293 sample[GCOMP] = (ti * (si * tex00[1] + sf * tex01[1]) + \
294 tf * (si * tex10[1] + sf * tex11[1])) >> 2 * FIXED_SHIFT; \
295 sample[BCOMP] = (ti * (si * tex00[2] + sf * tex01[2]) + \
296 tf * (si * tex10[2] + sf * tex11[2])) >> 2 * FIXED_SHIFT; \
297 sample[ACOMP] = CHAN_MAX
298
299 #define NEAREST_RGBA COPY_CHAN4(sample, tex00)
300
301 #define LINEAR_RGBA \
302 sample[RCOMP] = (ti * (si * tex00[0] + sf * tex01[0]) + \
303 tf * (si * tex10[0] + sf * tex11[0])) >> 2 * FIXED_SHIFT;\
304 sample[GCOMP] = (ti * (si * tex00[1] + sf * tex01[1]) + \
305 tf * (si * tex10[1] + sf * tex11[1])) >> 2 * FIXED_SHIFT;\
306 sample[BCOMP] = (ti * (si * tex00[2] + sf * tex01[2]) + \
307 tf * (si * tex10[2] + sf * tex11[2])) >> 2 * FIXED_SHIFT;\
308 sample[ACOMP] = (ti * (si * tex00[3] + sf * tex01[3]) + \
309 tf * (si * tex10[3] + sf * tex11[3])) >> 2 * FIXED_SHIFT
310
311 #define MODULATE \
312 dest[RCOMP] = span->red * (sample[RCOMP] + 1u) >> (FIXED_SHIFT + 8); \
313 dest[GCOMP] = span->green * (sample[GCOMP] + 1u) >> (FIXED_SHIFT + 8); \
314 dest[BCOMP] = span->blue * (sample[BCOMP] + 1u) >> (FIXED_SHIFT + 8); \
315 dest[ACOMP] = span->alpha * (sample[ACOMP] + 1u) >> (FIXED_SHIFT + 8)
316
317 #define DECAL \
318 dest[RCOMP] = ((CHAN_MAX - sample[ACOMP]) * span->red + \
319 ((sample[ACOMP] + 1) * sample[RCOMP] << FIXED_SHIFT)) \
320 >> (FIXED_SHIFT + 8); \
321 dest[GCOMP] = ((CHAN_MAX - sample[ACOMP]) * span->green + \
322 ((sample[ACOMP] + 1) * sample[GCOMP] << FIXED_SHIFT)) \
323 >> (FIXED_SHIFT + 8); \
324 dest[BCOMP] = ((CHAN_MAX - sample[ACOMP]) * span->blue + \
325 ((sample[ACOMP] + 1) * sample[BCOMP] << FIXED_SHIFT)) \
326 >> (FIXED_SHIFT + 8); \
327 dest[ACOMP] = FixedToInt(span->alpha)
328
329 #define BLEND \
330 dest[RCOMP] = ((CHAN_MAX - sample[RCOMP]) * span->red \
331 + (sample[RCOMP] + 1) * info->er) >> (FIXED_SHIFT + 8); \
332 dest[GCOMP] = ((CHAN_MAX - sample[GCOMP]) * span->green \
333 + (sample[GCOMP] + 1) * info->eg) >> (FIXED_SHIFT + 8); \
334 dest[BCOMP] = ((CHAN_MAX - sample[BCOMP]) * span->blue \
335 + (sample[BCOMP] + 1) * info->eb) >> (FIXED_SHIFT + 8); \
336 dest[ACOMP] = span->alpha * (sample[ACOMP] + 1) >> (FIXED_SHIFT + 8)
337
338 #define REPLACE COPY_CHAN4(dest, sample)
339
340 #define ADD \
341 { \
342 GLint rSum = FixedToInt(span->red) + (GLint) sample[RCOMP]; \
343 GLint gSum = FixedToInt(span->green) + (GLint) sample[GCOMP]; \
344 GLint bSum = FixedToInt(span->blue) + (GLint) sample[BCOMP]; \
345 dest[RCOMP] = MIN2(rSum, CHAN_MAX); \
346 dest[GCOMP] = MIN2(gSum, CHAN_MAX); \
347 dest[BCOMP] = MIN2(bSum, CHAN_MAX); \
348 dest[ACOMP] = span->alpha * (sample[ACOMP] + 1) >> (FIXED_SHIFT + 8); \
349 }
350
351 /* shortcuts */
352
353 #define NEAREST_RGB_REPLACE \
354 NEAREST_RGB; \
355 dest[0] = sample[0]; \
356 dest[1] = sample[1]; \
357 dest[2] = sample[2]; \
358 dest[3] = FixedToInt(span->alpha);
359
360 #define NEAREST_RGBA_REPLACE COPY_CHAN4(dest, tex00)
361
362 #define SPAN_NEAREST(DO_TEX,COMP) \
363 for (i = 0; i < span->end; i++) { \
364 /* Isn't it necessary to use FixedFloor below?? */ \
365 GLint s = FixedToInt(span->intTex[0]) & info->smask; \
366 GLint t = FixedToInt(span->intTex[1]) & info->tmask; \
367 GLint pos = (t << info->twidth_log2) + s; \
368 const GLchan *tex00 = info->texture + COMP * pos; \
369 DO_TEX; \
370 span->red += span->redStep; \
371 span->green += span->greenStep; \
372 span->blue += span->blueStep; \
373 span->alpha += span->alphaStep; \
374 span->intTex[0] += span->intTexStep[0]; \
375 span->intTex[1] += span->intTexStep[1]; \
376 dest += 4; \
377 }
378
379 #define SPAN_LINEAR(DO_TEX,COMP) \
380 for (i = 0; i < span->end; i++) { \
381 /* Isn't it necessary to use FixedFloor below?? */ \
382 GLint s = FixedToInt(span->intTex[0]) & info->smask; \
383 GLint t = FixedToInt(span->intTex[1]) & info->tmask; \
384 GLfixed sf = span->intTex[0] & FIXED_FRAC_MASK; \
385 GLfixed tf = span->intTex[1] & FIXED_FRAC_MASK; \
386 GLfixed si = FIXED_FRAC_MASK - sf; \
387 GLfixed ti = FIXED_FRAC_MASK - tf; \
388 GLint pos = (t << info->twidth_log2) + s; \
389 const GLchan *tex00 = info->texture + COMP * pos; \
390 const GLchan *tex10 = tex00 + info->tbytesline; \
391 const GLchan *tex01 = tex00 + COMP; \
392 const GLchan *tex11 = tex10 + COMP; \
393 (void) ti; \
394 (void) si; \
395 if (t == info->tmask) { \
396 tex10 -= info->tsize; \
397 tex11 -= info->tsize; \
398 } \
399 if (s == info->smask) { \
400 tex01 -= info->tbytesline; \
401 tex11 -= info->tbytesline; \
402 } \
403 DO_TEX; \
404 span->red += span->redStep; \
405 span->green += span->greenStep; \
406 span->blue += span->blueStep; \
407 span->alpha += span->alphaStep; \
408 span->intTex[0] += span->intTexStep[0]; \
409 span->intTex[1] += span->intTexStep[1]; \
410 dest += 4; \
411 }
412
413
414 GLuint i;
415 GLchan *dest = span->array->rgba[0];
416
417 span->intTex[0] -= FIXED_HALF;
418 span->intTex[1] -= FIXED_HALF;
419 switch (info->filter) {
420 case GL_NEAREST:
421 switch (info->format) {
422 case GL_RGB:
423 switch (info->envmode) {
424 case GL_MODULATE:
425 SPAN_NEAREST(NEAREST_RGB;MODULATE,3);
426 break;
427 case GL_DECAL:
428 case GL_REPLACE:
429 SPAN_NEAREST(NEAREST_RGB_REPLACE,3);
430 break;
431 case GL_BLEND:
432 SPAN_NEAREST(NEAREST_RGB;BLEND,3);
433 break;
434 case GL_ADD:
435 SPAN_NEAREST(NEAREST_RGB;ADD,3);
436 break;
437 default:
438 _mesa_problem(ctx, "bad tex env mode in SPAN_LINEAR");
439 return;
440 }
441 break;
442 case GL_RGBA:
443 switch(info->envmode) {
444 case GL_MODULATE:
445 SPAN_NEAREST(NEAREST_RGBA;MODULATE,4);
446 break;
447 case GL_DECAL:
448 SPAN_NEAREST(NEAREST_RGBA;DECAL,4);
449 break;
450 case GL_BLEND:
451 SPAN_NEAREST(NEAREST_RGBA;BLEND,4);
452 break;
453 case GL_ADD:
454 SPAN_NEAREST(NEAREST_RGBA;ADD,4);
455 break;
456 case GL_REPLACE:
457 SPAN_NEAREST(NEAREST_RGBA_REPLACE,4);
458 break;
459 default:
460 _mesa_problem(ctx, "bad tex env mode (2) in SPAN_LINEAR");
461 return;
462 }
463 break;
464 }
465 break;
466
467 case GL_LINEAR:
468 span->intTex[0] -= FIXED_HALF;
469 span->intTex[1] -= FIXED_HALF;
470 switch (info->format) {
471 case GL_RGB:
472 switch (info->envmode) {
473 case GL_MODULATE:
474 SPAN_LINEAR(LINEAR_RGB;MODULATE,3);
475 break;
476 case GL_DECAL:
477 case GL_REPLACE:
478 SPAN_LINEAR(LINEAR_RGB;REPLACE,3);
479 break;
480 case GL_BLEND:
481 SPAN_LINEAR(LINEAR_RGB;BLEND,3);
482 break;
483 case GL_ADD:
484 SPAN_LINEAR(LINEAR_RGB;ADD,3);
485 break;
486 default:
487 _mesa_problem(ctx, "bad tex env mode (3) in SPAN_LINEAR");
488 return;
489 }
490 break;
491 case GL_RGBA:
492 switch (info->envmode) {
493 case GL_MODULATE:
494 SPAN_LINEAR(LINEAR_RGBA;MODULATE,4);
495 break;
496 case GL_DECAL:
497 SPAN_LINEAR(LINEAR_RGBA;DECAL,4);
498 break;
499 case GL_BLEND:
500 SPAN_LINEAR(LINEAR_RGBA;BLEND,4);
501 break;
502 case GL_ADD:
503 SPAN_LINEAR(LINEAR_RGBA;ADD,4);
504 break;
505 case GL_REPLACE:
506 SPAN_LINEAR(LINEAR_RGBA;REPLACE,4);
507 break;
508 default:
509 _mesa_problem(ctx, "bad tex env mode (4) in SPAN_LINEAR");
510 return;
511 }
512 break;
513 }
514 break;
515 }
516 span->interpMask &= ~SPAN_RGBA;
517 ASSERT(span->arrayMask & SPAN_RGBA);
518 _mesa_write_rgba_span(ctx, span);
519
520 #undef SPAN_NEAREST
521 #undef SPAN_LINEAR
522 }
523
524
525
526 /*
527 * Render an RGB/RGBA textured triangle without perspective correction.
528 */
529 #define NAME affine_textured_triangle
530 #define INTERP_Z 1
531 #define INTERP_FOG 1
532 #define DEPTH_TYPE DEFAULT_SOFTWARE_DEPTH_TYPE
533 #define INTERP_RGB 1
534 #define INTERP_ALPHA 1
535 #define INTERP_INT_TEX 1
536 #define S_SCALE twidth
537 #define T_SCALE theight
538
539 #define SETUP_CODE \
540 struct affine_info info; \
541 struct gl_texture_unit *unit = ctx->Texture.Unit+0; \
542 struct gl_texture_object *obj = unit->Current2D; \
543 const GLint b = obj->BaseLevel; \
544 const GLfloat twidth = (GLfloat) obj->Image[b]->Width; \
545 const GLfloat theight = (GLfloat) obj->Image[b]->Height; \
546 info.texture = (const GLchan *) obj->Image[b]->Data; \
547 info.twidth_log2 = obj->Image[b]->WidthLog2; \
548 info.smask = obj->Image[b]->Width - 1; \
549 info.tmask = obj->Image[b]->Height - 1; \
550 info.format = obj->Image[b]->Format; \
551 info.filter = obj->MinFilter; \
552 info.envmode = unit->EnvMode; \
553 span.arrayMask |= SPAN_RGBA; \
554 \
555 if (info.envmode == GL_BLEND) { \
556 /* potential off-by-one error here? (1.0f -> 2048 -> 0) */ \
557 info.er = FloatToFixed(unit->EnvColor[RCOMP] * CHAN_MAXF); \
558 info.eg = FloatToFixed(unit->EnvColor[GCOMP] * CHAN_MAXF); \
559 info.eb = FloatToFixed(unit->EnvColor[BCOMP] * CHAN_MAXF); \
560 info.ea = FloatToFixed(unit->EnvColor[ACOMP] * CHAN_MAXF); \
561 } \
562 if (!info.texture) { \
563 /* this shouldn't happen */ \
564 return; \
565 } \
566 \
567 switch (info.format) { \
568 case GL_ALPHA: \
569 case GL_LUMINANCE: \
570 case GL_INTENSITY: \
571 info.tbytesline = obj->Image[b]->Width; \
572 break; \
573 case GL_LUMINANCE_ALPHA: \
574 info.tbytesline = obj->Image[b]->Width * 2; \
575 break; \
576 case GL_RGB: \
577 info.tbytesline = obj->Image[b]->Width * 3; \
578 break; \
579 case GL_RGBA: \
580 info.tbytesline = obj->Image[b]->Width * 4; \
581 break; \
582 default: \
583 _mesa_problem(NULL, "Bad texture format in affine_texture_triangle");\
584 return; \
585 } \
586 info.tsize = obj->Image[b]->Height * info.tbytesline;
587
588 #define RENDER_SPAN( span ) affine_span(ctx, &span, &info);
589
590 #include "s_tritemp.h"
591
592
593
594 struct persp_info
595 {
596 GLenum filter;
597 GLenum format;
598 GLenum envmode;
599 GLint smask, tmask;
600 GLint twidth_log2;
601 const GLchan *texture;
602 GLfixed er, eg, eb, ea; /* texture env color */
603 GLint tbytesline, tsize;
604 };
605
606
607 static INLINE void
608 fast_persp_span(GLcontext *ctx, struct sw_span *span,
609 struct persp_info *info)
610 {
611 GLchan sample[4]; /* the filtered texture sample */
612
613 /* Instead of defining a function for each mode, a test is done
614 * between the outer and inner loops. This is to reduce code size
615 * and complexity. Observe that an optimizing compiler kills
616 * unused variables (for instance tf,sf,ti,si in case of GL_NEAREST).
617 */
618 #define SPAN_NEAREST(DO_TEX,COMP) \
619 for (i = 0; i < span->end; i++) { \
620 GLdouble invQ = tex_coord[2] ? \
621 (1.0 / tex_coord[2]) : 1.0; \
622 GLfloat s_tmp = (GLfloat) (tex_coord[0] * invQ); \
623 GLfloat t_tmp = (GLfloat) (tex_coord[1] * invQ); \
624 GLint s = IFLOOR(s_tmp) & info->smask; \
625 GLint t = IFLOOR(t_tmp) & info->tmask; \
626 GLint pos = (t << info->twidth_log2) + s; \
627 const GLchan *tex00 = info->texture + COMP * pos; \
628 DO_TEX; \
629 span->red += span->redStep; \
630 span->green += span->greenStep; \
631 span->blue += span->blueStep; \
632 span->alpha += span->alphaStep; \
633 tex_coord[0] += tex_step[0]; \
634 tex_coord[1] += tex_step[1]; \
635 tex_coord[2] += tex_step[2]; \
636 dest += 4; \
637 }
638
639 #define SPAN_LINEAR(DO_TEX,COMP) \
640 for (i = 0; i < span->end; i++) { \
641 GLdouble invQ = tex_coord[2] ? \
642 (1.0 / tex_coord[2]) : 1.0; \
643 GLfloat s_tmp = (GLfloat) (tex_coord[0] * invQ); \
644 GLfloat t_tmp = (GLfloat) (tex_coord[1] * invQ); \
645 GLfixed s_fix = FloatToFixed(s_tmp) - FIXED_HALF; \
646 GLfixed t_fix = FloatToFixed(t_tmp) - FIXED_HALF; \
647 GLint s = FixedToInt(FixedFloor(s_fix)) & info->smask; \
648 GLint t = FixedToInt(FixedFloor(t_fix)) & info->tmask; \
649 GLfixed sf = s_fix & FIXED_FRAC_MASK; \
650 GLfixed tf = t_fix & FIXED_FRAC_MASK; \
651 GLfixed si = FIXED_FRAC_MASK - sf; \
652 GLfixed ti = FIXED_FRAC_MASK - tf; \
653 GLint pos = (t << info->twidth_log2) + s; \
654 const GLchan *tex00 = info->texture + COMP * pos; \
655 const GLchan *tex10 = tex00 + info->tbytesline; \
656 const GLchan *tex01 = tex00 + COMP; \
657 const GLchan *tex11 = tex10 + COMP; \
658 (void) ti; \
659 (void) si; \
660 if (t == info->tmask) { \
661 tex10 -= info->tsize; \
662 tex11 -= info->tsize; \
663 } \
664 if (s == info->smask) { \
665 tex01 -= info->tbytesline; \
666 tex11 -= info->tbytesline; \
667 } \
668 DO_TEX; \
669 span->red += span->redStep; \
670 span->green += span->greenStep; \
671 span->blue += span->blueStep; \
672 span->alpha += span->alphaStep; \
673 tex_coord[0] += tex_step[0]; \
674 tex_coord[1] += tex_step[1]; \
675 tex_coord[2] += tex_step[2]; \
676 dest += 4; \
677 }
678
679 GLuint i;
680 GLfloat tex_coord[3], tex_step[3];
681 GLchan *dest = span->array->rgba[0];
682
683 tex_coord[0] = span->tex[0][0] * (info->smask + 1);
684 tex_step[0] = span->texStepX[0][0] * (info->smask + 1);
685 tex_coord[1] = span->tex[0][1] * (info->tmask + 1);
686 tex_step[1] = span->texStepX[0][1] * (info->tmask + 1);
687 /* span->tex[0][2] only if 3D-texturing, here only 2D */
688 tex_coord[2] = span->tex[0][3];
689 tex_step[2] = span->texStepX[0][3];
690
691 switch (info->filter) {
692 case GL_NEAREST:
693 switch (info->format) {
694 case GL_RGB:
695 switch (info->envmode) {
696 case GL_MODULATE:
697 SPAN_NEAREST(NEAREST_RGB;MODULATE,3);
698 break;
699 case GL_DECAL:
700 case GL_REPLACE:
701 SPAN_NEAREST(NEAREST_RGB_REPLACE,3);
702 break;
703 case GL_BLEND:
704 SPAN_NEAREST(NEAREST_RGB;BLEND,3);
705 break;
706 case GL_ADD:
707 SPAN_NEAREST(NEAREST_RGB;ADD,3);
708 break;
709 default:
710 _mesa_problem(ctx, "bad tex env mode (5) in SPAN_LINEAR");
711 return;
712 }
713 break;
714 case GL_RGBA:
715 switch(info->envmode) {
716 case GL_MODULATE:
717 SPAN_NEAREST(NEAREST_RGBA;MODULATE,4);
718 break;
719 case GL_DECAL:
720 SPAN_NEAREST(NEAREST_RGBA;DECAL,4);
721 break;
722 case GL_BLEND:
723 SPAN_NEAREST(NEAREST_RGBA;BLEND,4);
724 break;
725 case GL_ADD:
726 SPAN_NEAREST(NEAREST_RGBA;ADD,4);
727 break;
728 case GL_REPLACE:
729 SPAN_NEAREST(NEAREST_RGBA_REPLACE,4);
730 break;
731 default:
732 _mesa_problem(ctx, "bad tex env mode (6) in SPAN_LINEAR");
733 return;
734 }
735 break;
736 }
737 break;
738
739 case GL_LINEAR:
740 switch (info->format) {
741 case GL_RGB:
742 switch (info->envmode) {
743 case GL_MODULATE:
744 SPAN_LINEAR(LINEAR_RGB;MODULATE,3);
745 break;
746 case GL_DECAL:
747 case GL_REPLACE:
748 SPAN_LINEAR(LINEAR_RGB;REPLACE,3);
749 break;
750 case GL_BLEND:
751 SPAN_LINEAR(LINEAR_RGB;BLEND,3);
752 break;
753 case GL_ADD:
754 SPAN_LINEAR(LINEAR_RGB;ADD,3);
755 break;
756 default:
757 _mesa_problem(ctx, "bad tex env mode (7) in SPAN_LINEAR");
758 return;
759 }
760 break;
761 case GL_RGBA:
762 switch (info->envmode) {
763 case GL_MODULATE:
764 SPAN_LINEAR(LINEAR_RGBA;MODULATE,4);
765 break;
766 case GL_DECAL:
767 SPAN_LINEAR(LINEAR_RGBA;DECAL,4);
768 break;
769 case GL_BLEND:
770 SPAN_LINEAR(LINEAR_RGBA;BLEND,4);
771 break;
772 case GL_ADD:
773 SPAN_LINEAR(LINEAR_RGBA;ADD,4);
774 break;
775 case GL_REPLACE:
776 SPAN_LINEAR(LINEAR_RGBA;REPLACE,4);
777 break;
778 default:
779 _mesa_problem(ctx, "bad tex env mode (8) in SPAN_LINEAR");
780 return;
781 }
782 break;
783 }
784 break;
785 }
786
787 ASSERT(span->arrayMask & SPAN_RGBA);
788 _mesa_write_rgba_span(ctx, span);
789
790 #undef SPAN_NEAREST
791 #undef SPAN_LINEAR
792 }
793
794
795 /*
796 * Render an perspective corrected RGB/RGBA textured triangle.
797 * The Q (aka V in Mesa) coordinate must be zero such that the divide
798 * by interpolated Q/W comes out right.
799 *
800 */
801 #define NAME persp_textured_triangle
802 #define INTERP_Z 1
803 #define INTERP_FOG 1
804 #define DEPTH_TYPE DEFAULT_SOFTWARE_DEPTH_TYPE
805 #define INTERP_RGB 1
806 #define INTERP_ALPHA 1
807 #define INTERP_TEX 1
808
809 #define SETUP_CODE \
810 struct persp_info info; \
811 const struct gl_texture_unit *unit = ctx->Texture.Unit+0; \
812 const struct gl_texture_object *obj = unit->Current2D; \
813 const GLint b = obj->BaseLevel; \
814 info.texture = (const GLchan *) obj->Image[b]->Data; \
815 info.twidth_log2 = obj->Image[b]->WidthLog2; \
816 info.smask = obj->Image[b]->Width - 1; \
817 info.tmask = obj->Image[b]->Height - 1; \
818 info.format = obj->Image[b]->Format; \
819 info.filter = obj->MinFilter; \
820 info.envmode = unit->EnvMode; \
821 \
822 if (info.envmode == GL_BLEND) { \
823 /* potential off-by-one error here? (1.0f -> 2048 -> 0) */ \
824 info.er = FloatToFixed(unit->EnvColor[RCOMP] * CHAN_MAXF); \
825 info.eg = FloatToFixed(unit->EnvColor[GCOMP] * CHAN_MAXF); \
826 info.eb = FloatToFixed(unit->EnvColor[BCOMP] * CHAN_MAXF); \
827 info.ea = FloatToFixed(unit->EnvColor[ACOMP] * CHAN_MAXF); \
828 } \
829 if (!info.texture) { \
830 /* this shouldn't happen */ \
831 return; \
832 } \
833 \
834 switch (info.format) { \
835 case GL_ALPHA: \
836 case GL_LUMINANCE: \
837 case GL_INTENSITY: \
838 info.tbytesline = obj->Image[b]->Width; \
839 break; \
840 case GL_LUMINANCE_ALPHA: \
841 info.tbytesline = obj->Image[b]->Width * 2; \
842 break; \
843 case GL_RGB: \
844 info.tbytesline = obj->Image[b]->Width * 3; \
845 break; \
846 case GL_RGBA: \
847 info.tbytesline = obj->Image[b]->Width * 4; \
848 break; \
849 default: \
850 _mesa_problem(NULL, "Bad texture format in persp_textured_triangle");\
851 return; \
852 } \
853 info.tsize = obj->Image[b]->Height * info.tbytesline;
854
855 #define RENDER_SPAN( span ) \
856 span.interpMask &= ~SPAN_RGBA; \
857 span.arrayMask |= SPAN_RGBA; \
858 fast_persp_span(ctx, &span, &info);
859
860 #include "s_tritemp.h"
861
862
863 #endif /* CHAN_BITS != GL_FLOAT */
864
865
866
867
868 /*
869 * Render a smooth-shaded, textured, RGBA triangle.
870 * Interpolate S,T,R with perspective correction, w/out mipmapping.
871 */
872 #define NAME general_textured_triangle
873 #define INTERP_Z 1
874 #define INTERP_FOG 1
875 #define DEPTH_TYPE DEFAULT_SOFTWARE_DEPTH_TYPE
876 #define INTERP_RGB 1
877 #define INTERP_SPEC 1
878 #define INTERP_ALPHA 1
879 #define INTERP_TEX 1
880 #define RENDER_SPAN( span ) _mesa_write_texture_span(ctx, &span);
881 #include "s_tritemp.h"
882
883
884
885 /*
886 * This is the big one!
887 * Interpolate Z, RGB, Alpha, specular, fog, and N sets of texture coordinates.
888 * Yup, it's slow.
889 */
890 #define NAME multitextured_triangle
891 #define INTERP_Z 1
892 #define INTERP_FOG 1
893 #define DEPTH_TYPE DEFAULT_SOFTWARE_DEPTH_TYPE
894 #define INTERP_RGB 1
895 #define INTERP_ALPHA 1
896 #define INTERP_SPEC 1
897 #define INTERP_MULTITEX 1
898 #define RENDER_SPAN( span ) _mesa_write_texture_span(ctx, &span);
899 #include "s_tritemp.h"
900
901
902
903 #define NAME occlusion_zless_triangle
904 #define DO_OCCLUSION_TEST
905 #define INTERP_Z 1
906 #define DEPTH_TYPE DEFAULT_SOFTWARE_DEPTH_TYPE
907 #define SETUP_CODE \
908 if (ctx->OcclusionResult) { \
909 return; \
910 }
911 #define RENDER_SPAN( span ) \
912 GLuint i; \
913 for (i = 0; i < span.end; i++) { \
914 GLdepth z = FixedToDepth(span.z); \
915 if (z < zRow[i]) { \
916 ctx->OcclusionResult = GL_TRUE; \
917 return; \
918 } \
919 span.z += span.zStep; \
920 }
921 #include "s_tritemp.h"
922
923
924
925 static void
926 nodraw_triangle( GLcontext *ctx,
927 const SWvertex *v0,
928 const SWvertex *v1,
929 const SWvertex *v2 )
930 {
931 (void) (ctx && v0 && v1 && v2);
932 }
933
934
935 /*
936 * This is used when separate specular color is enabled, but not
937 * texturing. We add the specular color to the primary color,
938 * draw the triangle, then restore the original primary color.
939 * Inefficient, but seldom needed.
940 */
941 void _swrast_add_spec_terms_triangle( GLcontext *ctx,
942 const SWvertex *v0,
943 const SWvertex *v1,
944 const SWvertex *v2 )
945 {
946 SWvertex *ncv0 = (SWvertex *)v0; /* drop const qualifier */
947 SWvertex *ncv1 = (SWvertex *)v1;
948 SWvertex *ncv2 = (SWvertex *)v2;
949 #if CHAN_TYPE == GL_FLOAT
950 GLfloat rSum, gSum, bSum;
951 #else
952 GLint rSum, gSum, bSum;
953 #endif
954 GLchan c[3][4];
955 /* save original colors */
956 COPY_CHAN4( c[0], ncv0->color );
957 COPY_CHAN4( c[1], ncv1->color );
958 COPY_CHAN4( c[2], ncv2->color );
959 /* sum v0 */
960 rSum = ncv0->color[0] + ncv0->specular[0];
961 gSum = ncv0->color[1] + ncv0->specular[1];
962 bSum = ncv0->color[2] + ncv0->specular[2];
963 ncv0->color[0] = MIN2(rSum, CHAN_MAX);
964 ncv0->color[1] = MIN2(gSum, CHAN_MAX);
965 ncv0->color[2] = MIN2(bSum, CHAN_MAX);
966 /* sum v1 */
967 rSum = ncv1->color[0] + ncv1->specular[0];
968 gSum = ncv1->color[1] + ncv1->specular[1];
969 bSum = ncv1->color[2] + ncv1->specular[2];
970 ncv1->color[0] = MIN2(rSum, CHAN_MAX);
971 ncv1->color[1] = MIN2(gSum, CHAN_MAX);
972 ncv1->color[2] = MIN2(bSum, CHAN_MAX);
973 /* sum v2 */
974 rSum = ncv2->color[0] + ncv2->specular[0];
975 gSum = ncv2->color[1] + ncv2->specular[1];
976 bSum = ncv2->color[2] + ncv2->specular[2];
977 ncv2->color[0] = MIN2(rSum, CHAN_MAX);
978 ncv2->color[1] = MIN2(gSum, CHAN_MAX);
979 ncv2->color[2] = MIN2(bSum, CHAN_MAX);
980 /* draw */
981 SWRAST_CONTEXT(ctx)->SpecTriangle( ctx, ncv0, ncv1, ncv2 );
982 /* restore original colors */
983 COPY_CHAN4( ncv0->color, c[0] );
984 COPY_CHAN4( ncv1->color, c[1] );
985 COPY_CHAN4( ncv2->color, c[2] );
986 }
987
988
989
990 #ifdef DEBUG
991
992 /* record the current triangle function name */
993 const char *_mesa_triFuncName = NULL;
994
995 #define USE(triFunc) \
996 do { \
997 _mesa_triFuncName = #triFunc; \
998 /*printf("%s\n", _mesa_triFuncName);*/ \
999 swrast->Triangle = triFunc; \
1000 } while (0)
1001
1002 #else
1003
1004 #define USE(triFunc) swrast->Triangle = triFunc;
1005
1006 #endif
1007
1008
1009
1010
1011 /*
1012 * Determine which triangle rendering function to use given the current
1013 * rendering context.
1014 *
1015 * Please update the summary flag _SWRAST_NEW_TRIANGLE if you add or
1016 * remove tests to this code.
1017 */
1018 void
1019 _swrast_choose_triangle( GLcontext *ctx )
1020 {
1021 SWcontext *swrast = SWRAST_CONTEXT(ctx);
1022 const GLboolean rgbmode = ctx->Visual.rgbMode;
1023
1024 if (ctx->Polygon.CullFlag &&
1025 ctx->Polygon.CullFaceMode == GL_FRONT_AND_BACK) {
1026 USE(nodraw_triangle);
1027 return;
1028 }
1029
1030 if (ctx->RenderMode==GL_RENDER) {
1031
1032 if (ctx->Polygon.SmoothFlag) {
1033 _mesa_set_aa_triangle_function(ctx);
1034 ASSERT(swrast->Triangle);
1035 return;
1036 }
1037
1038 if (ctx->Depth.OcclusionTest &&
1039 ctx->Depth.Test &&
1040 ctx->Depth.Mask == GL_FALSE &&
1041 ctx->Depth.Func == GL_LESS &&
1042 !ctx->Stencil.Enabled) {
1043 if ((rgbmode &&
1044 ctx->Color.ColorMask[0] == 0 &&
1045 ctx->Color.ColorMask[1] == 0 &&
1046 ctx->Color.ColorMask[2] == 0 &&
1047 ctx->Color.ColorMask[3] == 0)
1048 ||
1049 (!rgbmode && ctx->Color.IndexMask == 0)) {
1050 USE(occlusion_zless_triangle);
1051 return;
1052 }
1053 }
1054
1055 if (ctx->Texture._EnabledUnits) {
1056 /* Ugh, we do a _lot_ of tests to pick the best textured tri func */
1057 const struct gl_texture_object *texObj2D;
1058 const struct gl_texture_image *texImg;
1059 GLenum minFilter, magFilter, envMode;
1060 GLint format;
1061 texObj2D = ctx->Texture.Unit[0].Current2D;
1062 texImg = texObj2D ? texObj2D->Image[texObj2D->BaseLevel] : NULL;
1063 format = texImg ? texImg->TexFormat->MesaFormat : -1;
1064 minFilter = texObj2D ? texObj2D->MinFilter : (GLenum) 0;
1065 magFilter = texObj2D ? texObj2D->MagFilter : (GLenum) 0;
1066 envMode = ctx->Texture.Unit[0].EnvMode;
1067
1068 /* First see if we can use an optimized 2-D texture function */
1069 if (ctx->Texture._EnabledUnits == 1
1070 && ctx->Texture.Unit[0]._ReallyEnabled == TEXTURE_2D_BIT
1071 && texObj2D->WrapS==GL_REPEAT
1072 && texObj2D->WrapT==GL_REPEAT
1073 && texImg->Border==0
1074 && texImg->Width == texImg->RowStride
1075 && (format == MESA_FORMAT_RGB || format == MESA_FORMAT_RGBA)
1076 && minFilter == magFilter
1077 && ctx->Light.Model.ColorControl == GL_SINGLE_COLOR
1078 && ctx->Texture.Unit[0].EnvMode != GL_COMBINE_EXT) {
1079 if (ctx->Hint.PerspectiveCorrection==GL_FASTEST) {
1080 if (minFilter == GL_NEAREST
1081 && format == MESA_FORMAT_RGB
1082 && (envMode == GL_REPLACE || envMode == GL_DECAL)
1083 && ((swrast->_RasterMask == (DEPTH_BIT | TEXTURE_BIT)
1084 && ctx->Depth.Func == GL_LESS
1085 && ctx->Depth.Mask == GL_TRUE)
1086 || swrast->_RasterMask == TEXTURE_BIT)
1087 && ctx->Polygon.StippleFlag == GL_FALSE) {
1088 if (swrast->_RasterMask == (DEPTH_BIT | TEXTURE_BIT)) {
1089 USE(simple_z_textured_triangle);
1090 }
1091 else {
1092 USE(simple_textured_triangle);
1093 }
1094 }
1095 else {
1096 #if (CHAN_BITS == 16 || CHAN_BITS == 32)
1097 USE(general_textured_triangle);
1098 #else
1099 USE(affine_textured_triangle);
1100 #endif
1101 }
1102 }
1103 else {
1104 #if (CHAN_BITS == 16 || CHAN_BITS == 32)
1105 USE(general_textured_triangle);
1106 #else
1107 USE(persp_textured_triangle);
1108 #endif
1109 }
1110 }
1111 else {
1112 /* general case textured triangles */
1113 if (ctx->Texture._EnabledUnits > 1) {
1114 USE(multitextured_triangle);
1115 }
1116 else {
1117 USE(general_textured_triangle);
1118 }
1119 }
1120 }
1121 else {
1122 ASSERT(!ctx->Texture._EnabledUnits);
1123 if (ctx->Light.ShadeModel==GL_SMOOTH) {
1124 /* smooth shaded, no texturing, stippled or some raster ops */
1125 if (rgbmode) {
1126 USE(smooth_rgba_triangle);
1127 }
1128 else {
1129 USE(smooth_ci_triangle);
1130 }
1131 }
1132 else {
1133 /* flat shaded, no texturing, stippled or some raster ops */
1134 if (rgbmode) {
1135 USE(flat_rgba_triangle);
1136 }
1137 else {
1138 USE(flat_ci_triangle);
1139 }
1140 }
1141 }
1142 }
1143 else if (ctx->RenderMode==GL_FEEDBACK) {
1144 USE(_mesa_feedback_triangle);
1145 }
1146 else {
1147 /* GL_SELECT mode */
1148 USE(_mesa_select_triangle);
1149 }
1150 }