1 /*
2 * Mesa 3-D graphics library
3 *
4 * Copyright (C) 1999-2006 Brian Paul All Rights Reserved.
5 *
6 * Permission is hereby granted, free of charge, to any person obtaining a
7 * copy of this software and associated documentation files (the "Software"),
8 * to deal in the Software without restriction, including without limitation
9 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
10 * and/or sell copies of the Software, and to permit persons to whom the
11 * Software is furnished to do so, subject to the following conditions:
12 *
13 * The above copyright notice and this permission notice shall be included
14 * in all copies or substantial portions of the Software.
15 *
16 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
17 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
18 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
19 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
20 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
21 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
22 * OTHER DEALINGS IN THE SOFTWARE.
23 *
24 * Authors:
25 * Brian Paul Keith Whitwell <keithw@vmware.com>
26 */
27
28 /*
29 * Regarding GL_NV_texgen_reflection:
30 *
31 * Portions of this software may use or implement intellectual
32 * property owned and licensed by NVIDIA Corporation. NVIDIA disclaims
33 * any and all warranties with respect to such intellectual property,
34 * including any use thereof or modifications thereto.
35 */
36
37 #include "main/glheader.h"
38 #include "main/macros.h"
39 #include "main/imports.h"
40 #include "main/mtypes.h"
41
42 #include "math/m_xform.h"
43
44 #include "t_context.h"
45 #include "t_pipeline.h"
46
47
48 /***********************************************************************
49 * Automatic texture coordinate generation (texgen) code.
50 */
51
52
53 struct texgen_stage_data;
54
55 typedef void (*texgen_func)( struct gl_context *ctx,
56 struct texgen_stage_data *store,
57 GLuint unit);
58
59
60 struct texgen_stage_data {
61
62 /* Per-texunit derived state.
63 */
64 GLuint TexgenSize[MAX_TEXTURE_COORD_UNITS];
65 texgen_func TexgenFunc[MAX_TEXTURE_COORD_UNITS];
66
67 /* Temporary values used in texgen.
68 */
69 GLfloat (*tmp_f)[3];
70 GLfloat *tmp_m;
71
72 /* Buffered outputs of the stage.
73 */
74 GLvector4f texcoord[MAX_TEXTURE_COORD_UNITS];
75 };
76
77
78 #define TEXGEN_STAGE_DATA(stage) ((struct texgen_stage_data *)stage->privatePtr)
79
80
81
82 static GLuint all_bits[5] = {
83 0,
84 VEC_SIZE_1,
85 VEC_SIZE_2,
86 VEC_SIZE_3,
87 VEC_SIZE_4,
88 };
89
90 #define VEC_SIZE_FLAGS (VEC_SIZE_1|VEC_SIZE_2|VEC_SIZE_3|VEC_SIZE_4)
91
92 #define TEXGEN_NEED_M (TEXGEN_SPHERE_MAP)
93 #define TEXGEN_NEED_F (TEXGEN_SPHERE_MAP | \
94 TEXGEN_REFLECTION_MAP_NV)
95
96
97
build_m3(GLfloat f[][3],GLfloat m[],const GLvector4f * normal,const GLvector4f * eye)98 static void build_m3( GLfloat f[][3], GLfloat m[],
99 const GLvector4f *normal,
100 const GLvector4f *eye )
101 {
102 GLuint stride = eye->stride;
103 GLfloat *coord = (GLfloat *)eye->start;
104 GLuint count = eye->count;
105 const GLfloat *norm = normal->start;
106 GLuint i;
107
108 for (i=0;i<count;i++,STRIDE_F(coord,stride),STRIDE_F(norm,normal->stride)) {
109 GLfloat u[3], two_nu, fx, fy, fz;
110 COPY_3V( u, coord );
111 NORMALIZE_3FV( u );
112 two_nu = 2.0F * DOT3(norm,u);
113 fx = f[i][0] = u[0] - norm[0] * two_nu;
114 fy = f[i][1] = u[1] - norm[1] * two_nu;
115 fz = f[i][2] = u[2] - norm[2] * two_nu;
116 m[i] = fx * fx + fy * fy + (fz + 1.0F) * (fz + 1.0F);
117 if (m[i] != 0.0F) {
118 m[i] = 0.5F * (1.0f / sqrtf(m[i]));
119 }
120 }
121 }
122
123
124
build_m2(GLfloat f[][3],GLfloat m[],const GLvector4f * normal,const GLvector4f * eye)125 static void build_m2( GLfloat f[][3], GLfloat m[],
126 const GLvector4f *normal,
127 const GLvector4f *eye )
128 {
129 GLuint stride = eye->stride;
130 GLfloat *coord = eye->start;
131 GLuint count = eye->count;
132
133 GLfloat *norm = normal->start;
134 GLuint i;
135
136 for (i=0;i<count;i++,STRIDE_F(coord,stride),STRIDE_F(norm,normal->stride)) {
137 GLfloat u[3], two_nu, fx, fy, fz;
138 COPY_2V( u, coord );
139 u[2] = 0;
140 NORMALIZE_3FV( u );
141 two_nu = 2.0F * DOT3(norm,u);
142 fx = f[i][0] = u[0] - norm[0] * two_nu;
143 fy = f[i][1] = u[1] - norm[1] * two_nu;
144 fz = f[i][2] = u[2] - norm[2] * two_nu;
145 m[i] = fx * fx + fy * fy + (fz + 1.0F) * (fz + 1.0F);
146 if (m[i] != 0.0F) {
147 m[i] = 0.5F * (1.0f / sqrtf(m[i]));
148 }
149 }
150 }
151
152
153
154 typedef void (*build_m_func)( GLfloat f[][3],
155 GLfloat m[],
156 const GLvector4f *normal,
157 const GLvector4f *eye );
158
159
160 static build_m_func build_m_tab[5] = {
161 NULL,
162 NULL,
163 build_m2,
164 build_m3,
165 build_m3
166 };
167
168
169 /* This is unusual in that we respect the stride of the output vector
170 * (f). This allows us to pass in either a texcoord vector4f, or a
171 * temporary vector3f.
172 */
build_f3(GLfloat * f,GLuint fstride,const GLvector4f * normal,const GLvector4f * eye)173 static void build_f3( GLfloat *f,
174 GLuint fstride,
175 const GLvector4f *normal,
176 const GLvector4f *eye )
177 {
178 GLuint stride = eye->stride;
179 GLfloat *coord = eye->start;
180 GLuint count = eye->count;
181
182 GLfloat *norm = normal->start;
183 GLuint i;
184
185 for (i=0;i<count;i++) {
186 GLfloat u[3], two_nu;
187 COPY_3V( u, coord );
188 NORMALIZE_3FV( u );
189 two_nu = 2.0F * DOT3(norm,u);
190 f[0] = u[0] - norm[0] * two_nu;
191 f[1] = u[1] - norm[1] * two_nu;
192 f[2] = u[2] - norm[2] * two_nu;
193 STRIDE_F(coord,stride);
194 STRIDE_F(f,fstride);
195 STRIDE_F(norm, normal->stride);
196 }
197 }
198
199
build_f2(GLfloat * f,GLuint fstride,const GLvector4f * normal,const GLvector4f * eye)200 static void build_f2( GLfloat *f,
201 GLuint fstride,
202 const GLvector4f *normal,
203 const GLvector4f *eye )
204 {
205 GLuint stride = eye->stride;
206 GLfloat *coord = eye->start;
207 GLuint count = eye->count;
208 GLfloat *norm = normal->start;
209 GLuint i;
210
211 for (i=0;i<count;i++) {
212
213 GLfloat u[3], two_nu;
214 COPY_2V( u, coord );
215 u[2] = 0;
216 NORMALIZE_3FV( u );
217 two_nu = 2.0F * DOT3(norm,u);
218 f[0] = u[0] - norm[0] * two_nu;
219 f[1] = u[1] - norm[1] * two_nu;
220 f[2] = u[2] - norm[2] * two_nu;
221
222 STRIDE_F(coord,stride);
223 STRIDE_F(f,fstride);
224 STRIDE_F(norm, normal->stride);
225 }
226 }
227
228 typedef void (*build_f_func)( GLfloat *f,
229 GLuint fstride,
230 const GLvector4f *normal_vec,
231 const GLvector4f *eye );
232
233
234
235 /* Just treat 4-vectors as 3-vectors.
236 */
237 static build_f_func build_f_tab[5] = {
238 NULL,
239 NULL,
240 build_f2,
241 build_f3,
242 build_f3
243 };
244
245
246
247 /* Special case texgen functions.
248 */
texgen_reflection_map_nv(struct gl_context * ctx,struct texgen_stage_data * store,GLuint unit)249 static void texgen_reflection_map_nv( struct gl_context *ctx,
250 struct texgen_stage_data *store,
251 GLuint unit )
252 {
253 struct vertex_buffer *VB = &TNL_CONTEXT(ctx)->vb;
254 GLvector4f *in = VB->AttribPtr[VERT_ATTRIB_TEX0 + unit];
255 GLvector4f *out = &store->texcoord[unit];
256
257 build_f_tab[VB->EyePtr->size]( out->start,
258 out->stride,
259 VB->AttribPtr[_TNL_ATTRIB_NORMAL],
260 VB->EyePtr );
261
262 out->flags |= (in->flags & VEC_SIZE_FLAGS) | VEC_SIZE_3;
263 out->count = VB->Count;
264 out->size = MAX2(in->size, 3);
265 if (in->size == 4)
266 _mesa_copy_tab[0x8]( out, in );
267 }
268
269
270
texgen_normal_map_nv(struct gl_context * ctx,struct texgen_stage_data * store,GLuint unit)271 static void texgen_normal_map_nv( struct gl_context *ctx,
272 struct texgen_stage_data *store,
273 GLuint unit )
274 {
275 struct vertex_buffer *VB = &TNL_CONTEXT(ctx)->vb;
276 GLvector4f *in = VB->AttribPtr[VERT_ATTRIB_TEX0 + unit];
277 GLvector4f *out = &store->texcoord[unit];
278 GLvector4f *normal = VB->AttribPtr[_TNL_ATTRIB_NORMAL];
279 GLfloat (*texcoord)[4] = (GLfloat (*)[4])out->start;
280 GLuint count = VB->Count;
281 GLuint i;
282 const GLfloat *norm = normal->start;
283
284 for (i=0;i<count;i++, STRIDE_F(norm, normal->stride)) {
285 texcoord[i][0] = norm[0];
286 texcoord[i][1] = norm[1];
287 texcoord[i][2] = norm[2];
288 }
289
290
291 out->flags |= (in->flags & VEC_SIZE_FLAGS) | VEC_SIZE_3;
292 out->count = count;
293 out->size = MAX2(in->size, 3);
294 if (in->size == 4)
295 _mesa_copy_tab[0x8]( out, in );
296 }
297
298
texgen_sphere_map(struct gl_context * ctx,struct texgen_stage_data * store,GLuint unit)299 static void texgen_sphere_map( struct gl_context *ctx,
300 struct texgen_stage_data *store,
301 GLuint unit )
302 {
303 struct vertex_buffer *VB = &TNL_CONTEXT(ctx)->vb;
304 GLvector4f *in = VB->AttribPtr[VERT_ATTRIB_TEX0 + unit];
305 GLvector4f *out = &store->texcoord[unit];
306 GLfloat (*texcoord)[4] = (GLfloat (*)[4]) out->start;
307 GLuint count = VB->Count;
308 GLuint i;
309 GLfloat (*f)[3] = store->tmp_f;
310 GLfloat *m = store->tmp_m;
311
312 (build_m_tab[VB->EyePtr->size])( store->tmp_f,
313 store->tmp_m,
314 VB->AttribPtr[_TNL_ATTRIB_NORMAL],
315 VB->EyePtr );
316
317 out->size = MAX2(in->size,2);
318
319 for (i=0;i<count;i++) {
320 texcoord[i][0] = f[i][0] * m[i] + 0.5F;
321 texcoord[i][1] = f[i][1] * m[i] + 0.5F;
322 }
323
324 out->count = count;
325 out->flags |= (in->flags & VEC_SIZE_FLAGS) | VEC_SIZE_2;
326 if (in->size > 2)
327 _mesa_copy_tab[all_bits[in->size] & ~0x3]( out, in );
328 }
329
330
331
texgen(struct gl_context * ctx,struct texgen_stage_data * store,GLuint unit)332 static void texgen( struct gl_context *ctx,
333 struct texgen_stage_data *store,
334 GLuint unit )
335 {
336 TNLcontext *tnl = TNL_CONTEXT(ctx);
337 struct vertex_buffer *VB = &tnl->vb;
338 GLvector4f *in = VB->AttribPtr[VERT_ATTRIB_TEX0 + unit];
339 GLvector4f *out = &store->texcoord[unit];
340 const struct gl_texture_unit *texUnit = &ctx->Texture.Unit[unit];
341 const GLvector4f *obj = VB->AttribPtr[_TNL_ATTRIB_POS];
342 const GLvector4f *eye = VB->EyePtr;
343 const GLvector4f *normal = VB->AttribPtr[_TNL_ATTRIB_NORMAL];
344 const GLfloat *m = store->tmp_m;
345 const GLuint count = VB->Count;
346 GLfloat (*texcoord)[4] = (GLfloat (*)[4])out->data;
347 GLfloat (*f)[3] = store->tmp_f;
348 GLuint copy;
349
350 if (texUnit->_GenFlags & TEXGEN_NEED_M) {
351 build_m_tab[eye->size]( store->tmp_f, store->tmp_m, normal, eye );
352 } else if (texUnit->_GenFlags & TEXGEN_NEED_F) {
353 build_f_tab[eye->size]( (GLfloat *)store->tmp_f, 3, normal, eye );
354 }
355
356
357 out->size = MAX2(in->size, store->TexgenSize[unit]);
358 out->flags |= (in->flags & VEC_SIZE_FLAGS) | texUnit->TexGenEnabled;
359 out->count = count;
360
361 copy = (all_bits[in->size] & ~texUnit->TexGenEnabled);
362 if (copy)
363 _mesa_copy_tab[copy]( out, in );
364
365 if (texUnit->TexGenEnabled & S_BIT) {
366 GLuint i;
367 switch (texUnit->GenS.Mode) {
368 case GL_OBJECT_LINEAR:
369 _mesa_dotprod_tab[obj->size]( (GLfloat *)out->data,
370 sizeof(out->data[0]), obj,
371 texUnit->GenS.ObjectPlane );
372 break;
373 case GL_EYE_LINEAR:
374 _mesa_dotprod_tab[eye->size]( (GLfloat *)out->data,
375 sizeof(out->data[0]), eye,
376 texUnit->GenS.EyePlane );
377 break;
378 case GL_SPHERE_MAP:
379 for (i = 0; i < count; i++)
380 texcoord[i][0] = f[i][0] * m[i] + 0.5F;
381 break;
382 case GL_REFLECTION_MAP_NV:
383 for (i=0;i<count;i++)
384 texcoord[i][0] = f[i][0];
385 break;
386 case GL_NORMAL_MAP_NV: {
387 const GLfloat *norm = normal->start;
388 for (i=0;i<count;i++, STRIDE_F(norm, normal->stride)) {
389 texcoord[i][0] = norm[0];
390 }
391 break;
392 }
393 default:
394 _mesa_problem(ctx, "Bad S texgen");
395 }
396 }
397
398 if (texUnit->TexGenEnabled & T_BIT) {
399 GLuint i;
400 switch (texUnit->GenT.Mode) {
401 case GL_OBJECT_LINEAR:
402 _mesa_dotprod_tab[obj->size]( &(out->data[0][1]),
403 sizeof(out->data[0]), obj,
404 texUnit->GenT.ObjectPlane );
405 break;
406 case GL_EYE_LINEAR:
407 _mesa_dotprod_tab[eye->size]( &(out->data[0][1]),
408 sizeof(out->data[0]), eye,
409 texUnit->GenT.EyePlane );
410 break;
411 case GL_SPHERE_MAP:
412 for (i = 0; i < count; i++)
413 texcoord[i][1] = f[i][1] * m[i] + 0.5F;
414 break;
415 case GL_REFLECTION_MAP_NV:
416 for (i=0;i<count;i++)
417 texcoord[i][1] = f[i][1];
418 break;
419 case GL_NORMAL_MAP_NV: {
420 const GLfloat *norm = normal->start;
421 for (i=0;i<count;i++, STRIDE_F(norm, normal->stride)) {
422 texcoord[i][1] = norm[1];
423 }
424 break;
425 }
426 default:
427 _mesa_problem(ctx, "Bad T texgen");
428 }
429 }
430
431 if (texUnit->TexGenEnabled & R_BIT) {
432 GLuint i;
433 switch (texUnit->GenR.Mode) {
434 case GL_OBJECT_LINEAR:
435 _mesa_dotprod_tab[obj->size]( &(out->data[0][2]),
436 sizeof(out->data[0]), obj,
437 texUnit->GenR.ObjectPlane );
438 break;
439 case GL_EYE_LINEAR:
440 _mesa_dotprod_tab[eye->size]( &(out->data[0][2]),
441 sizeof(out->data[0]), eye,
442 texUnit->GenR.EyePlane );
443 break;
444 case GL_REFLECTION_MAP_NV:
445 for (i=0;i<count;i++)
446 texcoord[i][2] = f[i][2];
447 break;
448 case GL_NORMAL_MAP_NV: {
449 const GLfloat *norm = normal->start;
450 for (i=0;i<count;i++,STRIDE_F(norm, normal->stride)) {
451 texcoord[i][2] = norm[2];
452 }
453 break;
454 }
455 default:
456 _mesa_problem(ctx, "Bad R texgen");
457 }
458 }
459
460 if (texUnit->TexGenEnabled & Q_BIT) {
461 switch (texUnit->GenQ.Mode) {
462 case GL_OBJECT_LINEAR:
463 _mesa_dotprod_tab[obj->size]( &(out->data[0][3]),
464 sizeof(out->data[0]), obj,
465 texUnit->GenQ.ObjectPlane );
466 break;
467 case GL_EYE_LINEAR:
468 _mesa_dotprod_tab[eye->size]( &(out->data[0][3]),
469 sizeof(out->data[0]), eye,
470 texUnit->GenQ.EyePlane );
471 break;
472 default:
473 _mesa_problem(ctx, "Bad Q texgen");
474 }
475 }
476 }
477
478
479
480
run_texgen_stage(struct gl_context * ctx,struct tnl_pipeline_stage * stage)481 static GLboolean run_texgen_stage( struct gl_context *ctx,
482 struct tnl_pipeline_stage *stage )
483 {
484 struct vertex_buffer *VB = &TNL_CONTEXT(ctx)->vb;
485 struct texgen_stage_data *store = TEXGEN_STAGE_DATA(stage);
486 GLuint i;
487
488 if (!ctx->Texture._TexGenEnabled || ctx->VertexProgram._Current)
489 return GL_TRUE;
490
491 for (i = 0 ; i < ctx->Const.MaxTextureCoordUnits ; i++) {
492 struct gl_texture_unit *texUnit = &ctx->Texture.Unit[i];
493
494 if (texUnit->TexGenEnabled) {
495
496 store->TexgenFunc[i]( ctx, store, i );
497
498 VB->AttribPtr[VERT_ATTRIB_TEX0 + i] = &store->texcoord[i];
499 }
500 }
501
502 return GL_TRUE;
503 }
504
505
validate_texgen_stage(struct gl_context * ctx,struct tnl_pipeline_stage * stage)506 static void validate_texgen_stage( struct gl_context *ctx,
507 struct tnl_pipeline_stage *stage )
508 {
509 struct texgen_stage_data *store = TEXGEN_STAGE_DATA(stage);
510 GLuint i;
511
512 if (!ctx->Texture._TexGenEnabled || ctx->VertexProgram._Current)
513 return;
514
515 for (i = 0 ; i < ctx->Const.MaxTextureCoordUnits ; i++) {
516 struct gl_texture_unit *texUnit = &ctx->Texture.Unit[i];
517
518 if (texUnit->TexGenEnabled) {
519 GLuint sz;
520
521 if (texUnit->TexGenEnabled & Q_BIT)
522 sz = 4;
523 else if (texUnit->TexGenEnabled & R_BIT)
524 sz = 3;
525 else if (texUnit->TexGenEnabled & T_BIT)
526 sz = 2;
527 else
528 sz = 1;
529
530 store->TexgenSize[i] = sz;
531 store->TexgenFunc[i] = texgen; /* general solution */
532
533 /* look for special texgen cases */
534 if (texUnit->TexGenEnabled == (S_BIT|T_BIT|R_BIT)) {
535 if (texUnit->_GenFlags == TEXGEN_REFLECTION_MAP_NV) {
536 store->TexgenFunc[i] = texgen_reflection_map_nv;
537 }
538 else if (texUnit->_GenFlags == TEXGEN_NORMAL_MAP_NV) {
539 store->TexgenFunc[i] = texgen_normal_map_nv;
540 }
541 }
542 else if (texUnit->TexGenEnabled == (S_BIT|T_BIT) &&
543 texUnit->_GenFlags == TEXGEN_SPHERE_MAP) {
544 store->TexgenFunc[i] = texgen_sphere_map;
545 }
546 }
547 }
548 }
549
550
551
552
553
554 /* Called the first time stage->run() is invoked.
555 */
alloc_texgen_data(struct gl_context * ctx,struct tnl_pipeline_stage * stage)556 static GLboolean alloc_texgen_data( struct gl_context *ctx,
557 struct tnl_pipeline_stage *stage )
558 {
559 struct vertex_buffer *VB = &TNL_CONTEXT(ctx)->vb;
560 struct texgen_stage_data *store;
561 GLuint i;
562
563 stage->privatePtr = calloc(1, sizeof(*store));
564 store = TEXGEN_STAGE_DATA(stage);
565 if (!store)
566 return GL_FALSE;
567
568 for (i = 0 ; i < ctx->Const.MaxTextureCoordUnits ; i++)
569 _mesa_vector4f_alloc( &store->texcoord[i], 0, VB->Size, 32 );
570
571 store->tmp_f = malloc(VB->Size * sizeof(GLfloat) * 3);
572 store->tmp_m = malloc(VB->Size * sizeof(GLfloat));
573
574 return GL_TRUE;
575 }
576
577
free_texgen_data(struct tnl_pipeline_stage * stage)578 static void free_texgen_data( struct tnl_pipeline_stage *stage )
579
580 {
581 struct texgen_stage_data *store = TEXGEN_STAGE_DATA(stage);
582 GLuint i;
583
584 if (store) {
585 for (i = 0 ; i < MAX_TEXTURE_COORD_UNITS ; i++)
586 if (store->texcoord[i].data)
587 _mesa_vector4f_free( &store->texcoord[i] );
588
589
590 free( store->tmp_f );
591 free( store->tmp_m );
592 free( store );
593 stage->privatePtr = NULL;
594 }
595 }
596
597
598
599 const struct tnl_pipeline_stage _tnl_texgen_stage =
600 {
601 "texgen", /* name */
602 NULL, /* private data */
603 alloc_texgen_data, /* destructor */
604 free_texgen_data, /* destructor */
605 validate_texgen_stage, /* check */
606 run_texgen_stage /* run -- initially set to alloc data */
607 };
608