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source: trunk/src/opengl/mesa/light.c@ 2963

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Last change on this file since 2963 was 2962, checked in by jeroen, 25 years ago
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File size: 36.4 KB

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1	/* $Id: light.c,v 1.2 2000-03-01 18:49:31 jeroen Exp $ */
2
3	/*
4	* Mesa 3-D graphics library
5	* Version: 3.1
6	*
7	* Copyright (C) 1999 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
30
31	#ifdef PC_HEADER
32	#include "all.h"
33	#else
34	#include <float.h>
35	#ifndef XFree86Server
36	#include <assert.h>
37	#include <float.h>
38	#include <math.h>
39	#include <stdlib.h>
40	#include <stdio.h>
41	#else
42	#include "GL/xf86glx.h"
43	#endif
44	#include "types.h"
45	#include "context.h"
46	#include "enums.h"
47	#include "light.h"
48	#include "macros.h"
49	#include "matrix.h"
50	#include "mmath.h"
51	#include "simple_list.h"
52	#include "vb.h"
53	#include "xform.h"
54	#endif
55
56
57
58	void gl_ShadeModel( GLcontext *ctx, GLenum mode )
59	{
60	ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx, "glShadeModel");
61
62	if (MESA_VERBOSE & VERBOSE_API)
63	fprintf(stderr, "glShadeModel %s\n", gl_lookup_enum_by_nr(mode));
64
65	if (mode == GL_FLAT \|\| mode == GL_SMOOTH) {
66	if (ctx->Light.ShadeModel != mode) {
67	ctx->Light.ShadeModel = mode;
68	if (ctx->Light.ShadeModel == GL_FLAT)
69	ctx->TriangleCaps \|= DD_FLATSHADE;
70	else
71	ctx->TriangleCaps &= ~DD_FLATSHADE;
72	ctx->NewState \|= NEW_RASTER_OPS;
73	if (ctx->Driver.ShadeModel)
74	(*ctx->Driver.ShadeModel)( ctx, mode );
75	}
76	}
77	else {
78	gl_error( ctx, GL_INVALID_ENUM, "glShadeModel" );
79	}
80	}
81
82
83
84	void gl_Lightfv( GLcontext *ctx,
85	GLenum light, GLenum pname, const GLfloat *params,
86	GLint nparams )
87	{
88	GLint l;
89
90	(void) nparams;
91
92	ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx, "glLight");
93
94	l = (GLint) (light - GL_LIGHT0);
95
96	if (l<0 \|\| l>=MAX_LIGHTS) {
97	gl_error( ctx, GL_INVALID_ENUM, "glLight" );
98	return;
99	}
100
101	switch (pname) {
102	case GL_AMBIENT:
103	COPY_4V( ctx->Light.Light[l].Ambient, params );
104	break;
105	case GL_DIFFUSE:
106	COPY_4V( ctx->Light.Light[l].Diffuse, params );
107	break;
108	case GL_SPECULAR:
109	COPY_4V( ctx->Light.Light[l].Specular, params );
110	break;
111	case GL_POSITION:
112	/* transform position by ModelView matrix */
113	TRANSFORM_POINT( ctx->Light.Light[l].EyePosition,
114	ctx->ModelView.m,
115	params );
116	break;
117	case GL_SPOT_DIRECTION:
118	/* transform direction by inverse modelview */
119	if (ctx->ModelView.flags & MAT_DIRTY_INVERSE) {
120	gl_matrix_analyze( &ctx->ModelView );
121	}
122	TRANSFORM_NORMAL( ctx->Light.Light[l].EyeDirection,
123	params,
124	ctx->ModelView.inv );
125	break;
126	case GL_SPOT_EXPONENT:
127	if (params[0]<0.0 \|\| params[0]>128.0) {
128	gl_error( ctx, GL_INVALID_VALUE, "glLight" );
129	return;
130	}
131	if (ctx->Light.Light[l].SpotExponent != params[0]) {
132	ctx->Light.Light[l].SpotExponent = params[0];
133	gl_compute_spot_exp_table( &ctx->Light.Light[l] );
134	}
135	break;
136	case GL_SPOT_CUTOFF:
137	if ((params[0]<0.0 \|\| params[0]>90.0) && params[0]!=180.0) {
138	gl_error( ctx, GL_INVALID_VALUE, "glLight" );
139	return;
140	}
141	ctx->Light.Light[l].SpotCutoff = params[0];
142	ctx->Light.Light[l].CosCutoff = cos(params[0]*DEG2RAD);
143	if (ctx->Light.Light[l].CosCutoff < 0)
144	ctx->Light.Light[l].CosCutoff = 0;
145	break;
146	case GL_CONSTANT_ATTENUATION:
147	if (params[0]<0.0) {
148	gl_error( ctx, GL_INVALID_VALUE, "glLight" );
149	return;
150	}
151	ctx->Light.Light[l].ConstantAttenuation = params[0];
152	break;
153	case GL_LINEAR_ATTENUATION:
154	if (params[0]<0.0) {
155	gl_error( ctx, GL_INVALID_VALUE, "glLight" );
156	return;
157	}
158	ctx->Light.Light[l].LinearAttenuation = params[0];
159	break;
160	case GL_QUADRATIC_ATTENUATION:
161	if (params[0]<0.0) {
162	gl_error( ctx, GL_INVALID_VALUE, "glLight" );
163	return;
164	}
165	ctx->Light.Light[l].QuadraticAttenuation = params[0];
166	break;
167	default:
168	gl_error( ctx, GL_INVALID_ENUM, "glLight" );
169	break;
170	}
171
172	if (ctx->Driver.Lightfv)
173	ctx->Driver.Lightfv( ctx, light, pname, params, nparams );
174
175	ctx->NewState \|= NEW_LIGHTING;
176	}
177
178
179
180	void gl_GetLightfv( GLcontext *ctx,
181	GLenum light, GLenum pname, GLfloat *params )
182	{
183	GLint l = (GLint) (light - GL_LIGHT0);
184
185	ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx, "glGetLight");
186
187	if (l<0 \|\| l>=MAX_LIGHTS) {
188	gl_error( ctx, GL_INVALID_ENUM, "glGetLightfv" );
189	return;
190	}
191
192	switch (pname) {
193	case GL_AMBIENT:
194	COPY_4V( params, ctx->Light.Light[l].Ambient );
195	break;
196	case GL_DIFFUSE:
197	COPY_4V( params, ctx->Light.Light[l].Diffuse );
198	break;
199	case GL_SPECULAR:
200	COPY_4V( params, ctx->Light.Light[l].Specular );
201	break;
202	case GL_POSITION:
203	COPY_4V( params, ctx->Light.Light[l].EyePosition );
204	break;
205	case GL_SPOT_DIRECTION:
206	COPY_3V( params, ctx->Light.Light[l].EyeDirection );
207	break;
208	case GL_SPOT_EXPONENT:
209	params[0] = ctx->Light.Light[l].SpotExponent;
210	break;
211	case GL_SPOT_CUTOFF:
212	params[0] = ctx->Light.Light[l].SpotCutoff;
213	break;
214	case GL_CONSTANT_ATTENUATION:
215	params[0] = ctx->Light.Light[l].ConstantAttenuation;
216	break;
217	case GL_LINEAR_ATTENUATION:
218	params[0] = ctx->Light.Light[l].LinearAttenuation;
219	break;
220	case GL_QUADRATIC_ATTENUATION:
221	params[0] = ctx->Light.Light[l].QuadraticAttenuation;
222	break;
223	default:
224	gl_error( ctx, GL_INVALID_ENUM, "glGetLightfv" );
225	break;
226	}
227	}
228
229
230
231	void gl_GetLightiv( GLcontext ctx, GLenum light, GLenum pname, GLint params )
232	{
233	GLint l = (GLint) (light - GL_LIGHT0);
234
235	ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx, "glGetLight");
236
237	if (l<0 \|\| l>=MAX_LIGHTS) {
238	gl_error( ctx, GL_INVALID_ENUM, "glGetLightiv" );
239	return;
240	}
241
242	switch (pname) {
243	case GL_AMBIENT:
244	params[0] = FLOAT_TO_INT(ctx->Light.Light[l].Ambient[0]);
245	params[1] = FLOAT_TO_INT(ctx->Light.Light[l].Ambient[1]);
246	params[2] = FLOAT_TO_INT(ctx->Light.Light[l].Ambient[2]);
247	params[3] = FLOAT_TO_INT(ctx->Light.Light[l].Ambient[3]);
248	break;
249	case GL_DIFFUSE:
250	params[0] = FLOAT_TO_INT(ctx->Light.Light[l].Diffuse[0]);
251	params[1] = FLOAT_TO_INT(ctx->Light.Light[l].Diffuse[1]);
252	params[2] = FLOAT_TO_INT(ctx->Light.Light[l].Diffuse[2]);
253	params[3] = FLOAT_TO_INT(ctx->Light.Light[l].Diffuse[3]);
254	break;
255	case GL_SPECULAR:
256	params[0] = FLOAT_TO_INT(ctx->Light.Light[l].Specular[0]);
257	params[1] = FLOAT_TO_INT(ctx->Light.Light[l].Specular[1]);
258	params[2] = FLOAT_TO_INT(ctx->Light.Light[l].Specular[2]);
259	params[3] = FLOAT_TO_INT(ctx->Light.Light[l].Specular[3]);
260	break;
261	case GL_POSITION:
262	params[0] = (GLint) ctx->Light.Light[l].EyePosition[0];
263	params[1] = (GLint) ctx->Light.Light[l].EyePosition[1];
264	params[2] = (GLint) ctx->Light.Light[l].EyePosition[2];
265	params[3] = (GLint) ctx->Light.Light[l].EyePosition[3];
266	break;
267	case GL_SPOT_DIRECTION:
268	params[0] = (GLint) ctx->Light.Light[l].EyeDirection[0];
269	params[1] = (GLint) ctx->Light.Light[l].EyeDirection[1];
270	params[2] = (GLint) ctx->Light.Light[l].EyeDirection[2];
271	break;
272	case GL_SPOT_EXPONENT:
273	params[0] = (GLint) ctx->Light.Light[l].SpotExponent;
274	break;
275	case GL_SPOT_CUTOFF:
276	params[0] = (GLint) ctx->Light.Light[l].SpotCutoff;
277	break;
278	case GL_CONSTANT_ATTENUATION:
279	params[0] = (GLint) ctx->Light.Light[l].ConstantAttenuation;
280	break;
281	case GL_LINEAR_ATTENUATION:
282	params[0] = (GLint) ctx->Light.Light[l].LinearAttenuation;
283	break;
284	case GL_QUADRATIC_ATTENUATION:
285	params[0] = (GLint) ctx->Light.Light[l].QuadraticAttenuation;
286	break;
287	default:
288	gl_error( ctx, GL_INVALID_ENUM, "glGetLightiv" );
289	break;
290	}
291	}
292
293
294
295	/**********************************************************************/
296	/* Light Model */
297	/**********************************************************************/
298
299
300	void gl_LightModelfv( GLcontext ctx, GLenum pname, const GLfloat params )
301	{
302	ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx, "glLightModel");
303
304	switch (pname) {
305	case GL_LIGHT_MODEL_AMBIENT:
306	COPY_4V( ctx->Light.Model.Ambient, params );
307	break;
308	case GL_LIGHT_MODEL_LOCAL_VIEWER:
309	if (params[0]==0.0)
310	ctx->Light.Model.LocalViewer = GL_FALSE;
311	else
312	ctx->Light.Model.LocalViewer = GL_TRUE;
313	break;
314	case GL_LIGHT_MODEL_TWO_SIDE:
315	if (params[0]==0.0)
316	ctx->Light.Model.TwoSide = GL_FALSE;
317	else
318	ctx->Light.Model.TwoSide = GL_TRUE;
319	break;
320	case GL_LIGHT_MODEL_COLOR_CONTROL:
321	if (params[0] == (GLfloat) GL_SINGLE_COLOR) {
322	ctx->Light.Model.ColorControl = GL_SINGLE_COLOR;
323	ctx->TriangleCaps &= ~DD_SEPERATE_SPECULAR;
324	}
325	else if (params[0] == (GLfloat) GL_SEPARATE_SPECULAR_COLOR) {
326	ctx->Light.Model.ColorControl = GL_SEPARATE_SPECULAR_COLOR;
327	ctx->TriangleCaps \|= DD_SEPERATE_SPECULAR;
328	}
329	else {
330	gl_error( ctx, GL_INVALID_ENUM, "glLightModel(param)" );
331	}
332	ctx->NewState \|= NEW_RASTER_OPS;
333	break;
334	default:
335	gl_error( ctx, GL_INVALID_ENUM, "glLightModel" );
336	break;
337	}
338
339	if (ctx->Driver.LightModelfv)
340	ctx->Driver.LightModelfv( ctx, pname, params );
341
342	ctx->NewState \|= NEW_LIGHTING;
343	}
344
345
346
347
348	/******** MATERIAL ********/
349
350
351	/*
352	* Given a face and pname value (ala glColorMaterial), compute a bitmask
353	* of the targeted material values.
354	*/
355	GLuint gl_material_bitmask( GLcontext *ctx, GLenum face, GLenum pname,
356	GLuint legal,
357	const char *where )
358	{
359	GLuint bitmask = 0;
360
361	/* Make a bitmask indicating what material attribute(s) we're updating */
362	switch (pname) {
363	case GL_EMISSION:
364	bitmask \|= FRONT_EMISSION_BIT \| BACK_EMISSION_BIT;
365	break;
366	case GL_AMBIENT:
367	bitmask \|= FRONT_AMBIENT_BIT \| BACK_AMBIENT_BIT;
368	break;
369	case GL_DIFFUSE:
370	bitmask \|= FRONT_DIFFUSE_BIT \| BACK_DIFFUSE_BIT;
371	break;
372	case GL_SPECULAR:
373	bitmask \|= FRONT_SPECULAR_BIT \| BACK_SPECULAR_BIT;
374	break;
375	case GL_SHININESS:
376	bitmask \|= FRONT_SHININESS_BIT \| BACK_SHININESS_BIT;
377	break;
378	case GL_AMBIENT_AND_DIFFUSE:
379	bitmask \|= FRONT_AMBIENT_BIT \| BACK_AMBIENT_BIT;
380	bitmask \|= FRONT_DIFFUSE_BIT \| BACK_DIFFUSE_BIT;
381	break;
382	case GL_COLOR_INDEXES:
383	bitmask \|= FRONT_INDEXES_BIT \| BACK_INDEXES_BIT;
384	break;
385	default:
386	gl_error( ctx, GL_INVALID_ENUM, where );
387	return 0;
388	}
389
390	if (face==GL_FRONT) {
391	bitmask &= FRONT_MATERIAL_BITS;
392	}
393	else if (face==GL_BACK) {
394	bitmask &= BACK_MATERIAL_BITS;
395	}
396	else if (face != GL_FRONT_AND_BACK) {
397	gl_error( ctx, GL_INVALID_ENUM, where );
398	return 0;
399	}
400
401	if (bitmask & ~legal) {
402	gl_error( ctx, GL_INVALID_ENUM, where );
403	return 0;
404	}
405
406	return bitmask;
407	}
408
409
410
411
412
413
414	/*
415	* Check if the global material has to be updated with info that was
416	* associated with a vertex via glMaterial.
417	* This function is used when any material values get changed between
418	* glBegin/glEnd either by calling glMaterial() or by calling glColor()
419	* when GL_COLOR_MATERIAL is enabled.
420	*
421	* KW: Added code here to keep the precomputed variables uptodate.
422	* This means we can use the faster shade functions when using
423	* GL_COLOR_MATERIAL, and we can also now use the precomputed
424	* values in the slower shading functions, which further offsets
425	* the cost of doing this here.
426	*/
427	void gl_update_material( GLcontext *ctx,
428	struct gl_material *src,
429	GLuint bitmask )
430	{
431	struct gl_light light, list = &ctx->Light.EnabledList;
432	GLfloat tmp[4];
433
434	if (ctx->Light.ColorMaterialEnabled)
435	bitmask &= ~ctx->Light.ColorMaterialBitmask;
436
437	if (MESA_VERBOSE&VERBOSE_IMMEDIATE)
438	fprintf(stderr, "gl_update_material, mask %x\n", bitmask);
439
440	if (!bitmask)
441	return;
442
443	if (bitmask & FRONT_AMBIENT_BIT) {
444	struct gl_material *mat = &ctx->Light.Material[0];
445	SUB_3V( tmp, src[0].Ambient, mat->Ambient );
446	ACC_SCALE_3V( ctx->Light.BaseColor[0], ctx->Light.Model.Ambient, tmp);
447	foreach (light, list) {
448	ACC_SCALE_3V( ctx->Light.BaseColor[0], light->Ambient, tmp );
449	}
450	COPY_4FV( mat->Ambient, src[0].Ambient );
451	}
452	if (bitmask & BACK_AMBIENT_BIT) {
453	struct gl_material *mat = &ctx->Light.Material[1];
454	SUB_3V( tmp, src[1].Ambient, mat->Ambient );
455	ACC_SCALE_3V( ctx->Light.BaseColor[1], ctx->Light.Model.Ambient, tmp);
456	foreach (light, list) {
457	ACC_SCALE_3V( ctx->Light.BaseColor[0], light->Ambient, tmp );
458	}
459	COPY_4FV( mat->Ambient, src[1].Ambient );
460	}
461	if (bitmask & FRONT_DIFFUSE_BIT) {
462	struct gl_material *mat = &ctx->Light.Material[0];
463	SUB_3V( tmp, src[0].Diffuse, mat->Diffuse );
464	foreach (light, list) {
465	ACC_SCALE_3V( light->MatDiffuse[0], light->Diffuse, tmp );
466	}
467	COPY_4FV( mat->Diffuse, src[0].Diffuse );
468	FLOAT_COLOR_TO_UBYTE_COLOR(ctx->Light.BaseAlpha[0], mat->Diffuse[3]);
469	}
470	if (bitmask & BACK_DIFFUSE_BIT) {
471	struct gl_material *mat = &ctx->Light.Material[1];
472	SUB_3V( tmp, src[1].Diffuse, mat->Diffuse );
473	foreach (light, list) {
474	ACC_SCALE_3V( light->MatDiffuse[1], light->Diffuse, tmp );
475	}
476	COPY_4FV( mat->Diffuse, src[1].Diffuse );
477	FLOAT_COLOR_TO_UBYTE_COLOR(ctx->Light.BaseAlpha[1], mat->Diffuse[3]);
478	}
479	if (bitmask & FRONT_SPECULAR_BIT) {
480	struct gl_material *mat = &ctx->Light.Material[0];
481	SUB_3V( tmp, src[0].Specular, mat->Specular );
482	foreach (light, list) {
483	if (light->Flags & LIGHT_SPECULAR) {
484	ACC_SCALE_3V( light->MatSpecular[0], light->Specular, tmp );
485	light->IsMatSpecular[0] =
486	(LEN_SQUARED_3FV(light->MatSpecular[0]) > 1e-16);
487	}
488	}
489	COPY_4FV( mat->Specular, src[0].Specular );
490	}
491	if (bitmask & BACK_SPECULAR_BIT) {
492	struct gl_material *mat = &ctx->Light.Material[1];
493	SUB_3V( tmp, src[1].Specular, mat->Specular );
494	foreach (light, list) {
495	if (light->Flags & LIGHT_SPECULAR) {
496	ACC_SCALE_3V( light->MatSpecular[1], light->Specular, tmp );
497	light->IsMatSpecular[1] =
498	(LEN_SQUARED_3FV(light->MatSpecular[1]) > 1e-16);
499	}
500	}
501	COPY_4FV( mat->Specular, src[1].Specular );
502	}
503	if (bitmask & FRONT_EMISSION_BIT) {
504	struct gl_material *mat = &ctx->Light.Material[0];
505	SUB_3V( tmp, src[0].Emission, mat->Emission );
506	ACC_3V( ctx->Light.BaseColor[0], tmp );
507	COPY_4FV( mat->Emission, src[0].Emission );
508	}
509	if (bitmask & BACK_EMISSION_BIT) {
510	struct gl_material *mat = &ctx->Light.Material[1];
511	SUB_3V( tmp, src[1].Emission, mat->Emission );
512	ACC_3V( ctx->Light.BaseColor[1], tmp );
513	COPY_4FV( mat->Emission, src[1].Emission );
514	}
515	if (bitmask & FRONT_SHININESS_BIT) {
516	GLfloat shininess = ctx->Light.Material[0].Shininess = src[0].Shininess;
517	gl_compute_shine_table( ctx, 0, shininess );
518	gl_compute_shine_table( ctx, 2, shininess * .5 );
519	}
520	if (bitmask & BACK_SHININESS_BIT) {
521	GLfloat shininess = ctx->Light.Material[1].Shininess = src[1].Shininess;
522	gl_compute_shine_table( ctx, 1, shininess );
523	gl_compute_shine_table( ctx, 3, shininess * .5 );
524	}
525	if (bitmask & FRONT_INDEXES_BIT) {
526	ctx->Light.Material[0].AmbientIndex = src[0].AmbientIndex;
527	ctx->Light.Material[0].DiffuseIndex = src[0].DiffuseIndex;
528	ctx->Light.Material[0].SpecularIndex = src[0].SpecularIndex;
529	}
530	if (bitmask & BACK_INDEXES_BIT) {
531	ctx->Light.Material[1].AmbientIndex = src[1].AmbientIndex;
532	ctx->Light.Material[1].DiffuseIndex = src[1].DiffuseIndex;
533	ctx->Light.Material[1].SpecularIndex = src[1].SpecularIndex;
534	}
535
536	if (0)
537	{
538	struct gl_material *mat = &ctx->Light.Material[0];
539	fprintf(stderr, "update_mat emission : %f %f %f\n",
540	mat->Emission[0],
541	mat->Emission[1],
542	mat->Emission[2]);
543	fprintf(stderr, "update_mat specular : %f %f %f\n",
544	mat->Specular[0],
545	mat->Specular[1],
546	mat->Specular[2]);
547	fprintf(stderr, "update_mat diffuse : %f %f %f\n",
548	mat->Diffuse[0],
549	mat->Diffuse[1],
550	mat->Diffuse[2]);
551	fprintf(stderr, "update_mat ambient : %f %f %f\n",
552	mat->Ambient[0],
553	mat->Ambient[1],
554	mat->Ambient[2]);
555	}
556	}
557
558
559
560
561
562
563	void gl_update_color_material( GLcontext *ctx,
564	const GLubyte rgba[4] )
565	{
566	struct gl_light light, list = &ctx->Light.EnabledList;
567	GLuint bitmask = ctx->Light.ColorMaterialBitmask;
568	GLfloat tmp[4], color[4];
569
570	UBYTE_RGBA_TO_FLOAT_RGBA( color, rgba );
571
572	if (MESA_VERBOSE&VERBOSE_IMMEDIATE)
573	fprintf(stderr, "gl_update_color_material, mask %x\n", bitmask);
574
575
576	if (bitmask & FRONT_AMBIENT_BIT) {
577	struct gl_material *mat = &ctx->Light.Material[0];
578	SUB_3V( tmp, color, mat->Ambient );
579	ACC_SCALE_3V( ctx->Light.BaseColor[0], ctx->Light.Model.Ambient, tmp);
580	foreach (light, list) {
581	ACC_SCALE_3V( ctx->Light.BaseColor[0], light->Ambient, tmp );
582	}
583	COPY_4FV( mat->Ambient, color );
584	}
585
586	if (bitmask & BACK_AMBIENT_BIT) {
587	struct gl_material *mat = &ctx->Light.Material[1];
588	SUB_3V( tmp, color, mat->Ambient );
589	ACC_SCALE_3V( ctx->Light.BaseColor[1], ctx->Light.Model.Ambient, tmp);
590	foreach (light, list) {
591	ACC_SCALE_3V( ctx->Light.BaseColor[0], light->Ambient, tmp );
592	}
593	COPY_4FV( mat->Ambient, color );
594	}
595
596	if (bitmask & FRONT_DIFFUSE_BIT) {
597	struct gl_material *mat = &ctx->Light.Material[0];
598	SUB_3V( tmp, color, mat->Diffuse );
599	foreach (light, list) {
600	ACC_SCALE_3V( light->MatDiffuse[0], light->Diffuse, tmp );
601	}
602	COPY_4FV( mat->Diffuse, color );
603	FLOAT_COLOR_TO_UBYTE_COLOR(ctx->Light.BaseAlpha[0], mat->Diffuse[3]);
604	}
605
606	if (bitmask & BACK_DIFFUSE_BIT) {
607	struct gl_material *mat = &ctx->Light.Material[1];
608	SUB_3V( tmp, color, mat->Diffuse );
609	foreach (light, list) {
610	ACC_SCALE_3V( light->MatDiffuse[1], light->Diffuse, tmp );
611	}
612	COPY_4FV( mat->Diffuse, color );
613	FLOAT_COLOR_TO_UBYTE_COLOR(ctx->Light.BaseAlpha[1], mat->Diffuse[3]);
614	}
615
616	if (bitmask & FRONT_SPECULAR_BIT) {
617	struct gl_material *mat = &ctx->Light.Material[0];
618	SUB_3V( tmp, color, mat->Specular );
619	foreach (light, list) {
620	if (light->Flags & LIGHT_SPECULAR) {
621	ACC_SCALE_3V( light->MatSpecular[0], light->Specular, tmp );
622	light->IsMatSpecular[0] =
623	(LEN_SQUARED_3FV(light->MatSpecular[0]) > 1e-16);
624	}
625	}
626	COPY_4FV( mat->Specular, color );
627	}
628	if (bitmask & BACK_SPECULAR_BIT) {
629	struct gl_material *mat = &ctx->Light.Material[1];
630	SUB_3V( tmp, color, mat->Specular );
631	foreach (light, list) {
632	if (light->Flags & LIGHT_SPECULAR) {
633	ACC_SCALE_3V( light->MatSpecular[1], light->Specular, tmp );
634	light->IsMatSpecular[1] =
635	(LEN_SQUARED_3FV(light->MatSpecular[1]) > 1e-16);
636	}
637	}
638	COPY_4FV( mat->Specular, color );
639	}
640	if (bitmask & FRONT_EMISSION_BIT) {
641	struct gl_material *mat = &ctx->Light.Material[0];
642	SUB_3V( tmp, color, mat->Emission );
643	ACC_3V( ctx->Light.BaseColor[0], tmp );
644	COPY_4FV( mat->Emission, color );
645	}
646	if (bitmask & BACK_EMISSION_BIT) {
647	struct gl_material *mat = &ctx->Light.Material[1];
648	SUB_3V( tmp, color, mat->Emission );
649	ACC_3V( ctx->Light.BaseColor[1], tmp );
650	COPY_4FV( mat->Emission, color );
651	}
652
653	if (0)
654	{
655	struct gl_material *mat = &ctx->Light.Material[0];
656	fprintf(stderr, "update_color_mat emission : %f %f %f\n",
657	mat->Emission[0],
658	mat->Emission[1],
659	mat->Emission[2]);
660	fprintf(stderr, "update_color_mat specular : %f %f %f\n",
661	mat->Specular[0],
662	mat->Specular[1],
663	mat->Specular[2]);
664	fprintf(stderr, "update_color_mat diffuse : %f %f %f\n",
665	mat->Diffuse[0],
666	mat->Diffuse[1],
667	mat->Diffuse[2]);
668	fprintf(stderr, "update_color_mat ambient : %f %f %f\n",
669	mat->Ambient[0],
670	mat->Ambient[1],
671	mat->Ambient[2]);
672	}
673	}
674
675
676
677
678	void gl_ColorMaterial( GLcontext *ctx, GLenum face, GLenum mode )
679	{
680	GLuint bitmask;
681	GLuint legal = (FRONT_EMISSION_BIT \| BACK_EMISSION_BIT \|
682	FRONT_SPECULAR_BIT \| BACK_SPECULAR_BIT \|
683	FRONT_DIFFUSE_BIT \| BACK_DIFFUSE_BIT \|
684	FRONT_AMBIENT_BIT \| BACK_AMBIENT_BIT);
685
686	ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx, "glColorMaterial");
687
688	if (MESA_VERBOSE&VERBOSE_API)
689	fprintf(stderr, "glColorMaterial %s %s\n",
690	gl_lookup_enum_by_nr(face),
691	gl_lookup_enum_by_nr(mode));
692
693	bitmask = gl_material_bitmask( ctx, face, mode, legal, "glColorMaterial" );
694
695	if (bitmask != 0) {
696	ctx->Light.ColorMaterialBitmask = bitmask;
697	ctx->Light.ColorMaterialFace = face;
698	ctx->Light.ColorMaterialMode = mode;
699	}
700
701	if (ctx->Light.ColorMaterialEnabled)
702	gl_update_color_material( ctx, ctx->Current.ByteColor );
703	}
704
705
706
707	/* KW: This is now called directly (ie by name) from the glMaterial*
708	* API functions.
709	*/
710	void gl_Materialfv( GLcontext *ctx,
711	GLenum face, GLenum pname, const GLfloat *params )
712	{
713	struct immediate *IM;
714	struct gl_material *mat;
715	GLuint bitmask;
716	GLuint count;
717
718	bitmask = gl_material_bitmask( ctx, face, pname, ~0, "gl_Materialfv" );
719	if (bitmask == 0)
720	return;
721
722	IM = ctx->input;
723	count = IM->Count;
724
725	if (!IM->Material) {
726	IM->Material =
727	(struct gl_material ()[2]) MALLOC( sizeof(struct gl_material)
728	VB_SIZE * 2 );
729	IM->MaterialMask = (GLuint ) MALLOC( sizeof(GLuint) VB_SIZE );
730	}
731
732
733	if (!(IM->Flag[count] & VERT_MATERIAL)) {
734	IM->Flag[count] \|= VERT_MATERIAL;
735	IM->MaterialMask[count] = 0;
736	}
737
738	IM->MaterialMask[count] \|= bitmask;
739	mat = IM->Material[count];
740
741	if (bitmask & FRONT_AMBIENT_BIT) {
742	COPY_4FV( mat[0].Ambient, params );
743	}
744	if (bitmask & BACK_AMBIENT_BIT) {
745	COPY_4FV( mat[1].Ambient, params );
746	}
747	if (bitmask & FRONT_DIFFUSE_BIT) {
748	COPY_4FV( mat[0].Diffuse, params );
749	}
750	if (bitmask & BACK_DIFFUSE_BIT) {
751	COPY_4FV( mat[1].Diffuse, params );
752	}
753	if (bitmask & FRONT_SPECULAR_BIT) {
754	COPY_4FV( mat[0].Specular, params );
755	}
756	if (bitmask & BACK_SPECULAR_BIT) {
757	COPY_4FV( mat[1].Specular, params );
758	}
759	if (bitmask & FRONT_EMISSION_BIT) {
760	COPY_4FV( mat[0].Emission, params );
761	}
762	if (bitmask & BACK_EMISSION_BIT) {
763	COPY_4FV( mat[1].Emission, params );
764	}
765	if (bitmask & FRONT_SHININESS_BIT) {
766	GLfloat shininess = CLAMP( params[0], 0.0F, 128.0F );
767	mat[0].Shininess = shininess;
768	}
769	if (bitmask & BACK_SHININESS_BIT) {
770	GLfloat shininess = CLAMP( params[0], 0.0F, 128.0F );
771	mat[1].Shininess = shininess;
772	}
773	if (bitmask & FRONT_INDEXES_BIT) {
774	mat[0].AmbientIndex = params[0];
775	mat[0].DiffuseIndex = params[1];
776	mat[0].SpecularIndex = params[2];
777	}
778	if (bitmask & BACK_INDEXES_BIT) {
779	mat[1].AmbientIndex = params[0];
780	mat[1].DiffuseIndex = params[1];
781	mat[1].SpecularIndex = params[2];
782	}
783	}
784
785
786
787
788	void gl_GetMaterialfv( GLcontext *ctx,
789	GLenum face, GLenum pname, GLfloat *params )
790	{
791	GLuint f;
792
793	ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx, "glGetMaterialfv");
794
795	if (face==GL_FRONT) {
796	f = 0;
797	}
798	else if (face==GL_BACK) {
799	f = 1;
800	}
801	else {
802	gl_error( ctx, GL_INVALID_ENUM, "glGetMaterialfv(face)" );
803	return;
804	}
805	switch (pname) {
806	case GL_AMBIENT:
807	COPY_4FV( params, ctx->Light.Material[f].Ambient );
808	break;
809	case GL_DIFFUSE:
810	COPY_4FV( params, ctx->Light.Material[f].Diffuse );
811	break;
812	case GL_SPECULAR:
813	COPY_4FV( params, ctx->Light.Material[f].Specular );
814	break;
815	case GL_EMISSION:
816	COPY_4FV( params, ctx->Light.Material[f].Emission );
817	break;
818	case GL_SHININESS:
819	*params = ctx->Light.Material[f].Shininess;
820	break;
821	case GL_COLOR_INDEXES:
822	params[0] = ctx->Light.Material[f].AmbientIndex;
823	params[1] = ctx->Light.Material[f].DiffuseIndex;
824	params[2] = ctx->Light.Material[f].SpecularIndex;
825	break;
826	default:
827	gl_error( ctx, GL_INVALID_ENUM, "glGetMaterialfv(pname)" );
828	}
829	}
830
831
832
833	void gl_GetMaterialiv( GLcontext *ctx,
834	GLenum face, GLenum pname, GLint *params )
835	{
836	GLuint f;
837
838	ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx, "glGetMaterialiv");
839
840	if (face==GL_FRONT) {
841	f = 0;
842	}
843	else if (face==GL_BACK) {
844	f = 1;
845	}
846	else {
847	gl_error( ctx, GL_INVALID_ENUM, "glGetMaterialiv(face)" );
848	return;
849	}
850	switch (pname) {
851	case GL_AMBIENT:
852	params[0] = FLOAT_TO_INT( ctx->Light.Material[f].Ambient[0] );
853	params[1] = FLOAT_TO_INT( ctx->Light.Material[f].Ambient[1] );
854	params[2] = FLOAT_TO_INT( ctx->Light.Material[f].Ambient[2] );
855	params[3] = FLOAT_TO_INT( ctx->Light.Material[f].Ambient[3] );
856	break;
857	case GL_DIFFUSE:
858	params[0] = FLOAT_TO_INT( ctx->Light.Material[f].Diffuse[0] );
859	params[1] = FLOAT_TO_INT( ctx->Light.Material[f].Diffuse[1] );
860	params[2] = FLOAT_TO_INT( ctx->Light.Material[f].Diffuse[2] );
861	params[3] = FLOAT_TO_INT( ctx->Light.Material[f].Diffuse[3] );
862	break;
863	case GL_SPECULAR:
864	params[0] = FLOAT_TO_INT( ctx->Light.Material[f].Specular[0] );
865	params[1] = FLOAT_TO_INT( ctx->Light.Material[f].Specular[1] );
866	params[2] = FLOAT_TO_INT( ctx->Light.Material[f].Specular[2] );
867	params[3] = FLOAT_TO_INT( ctx->Light.Material[f].Specular[3] );
868	break;
869	case GL_EMISSION:
870	params[0] = FLOAT_TO_INT( ctx->Light.Material[f].Emission[0] );
871	params[1] = FLOAT_TO_INT( ctx->Light.Material[f].Emission[1] );
872	params[2] = FLOAT_TO_INT( ctx->Light.Material[f].Emission[2] );
873	params[3] = FLOAT_TO_INT( ctx->Light.Material[f].Emission[3] );
874	break;
875	case GL_SHININESS:
876	*params = ROUNDF( ctx->Light.Material[f].Shininess );
877	break;
878	case GL_COLOR_INDEXES:
879	params[0] = ROUNDF( ctx->Light.Material[f].AmbientIndex );
880	params[1] = ROUNDF( ctx->Light.Material[f].DiffuseIndex );
881	params[2] = ROUNDF( ctx->Light.Material[f].SpecularIndex );
882	break;
883	default:
884	gl_error( ctx, GL_INVALID_ENUM, "glGetMaterialfv(pname)" );
885	}
886	}
887
888
889
890
891	/**********************************************************************/
892	/*** Lighting computation ***/
893	/**********************************************************************/
894
895
896	/*
897	* Notes:
898	* When two-sided lighting is enabled we compute the color (or index)
899	* for both the front and back side of the primitive. Then, when the
900	* orientation of the facet is later learned, we can determine which
901	* color (or index) to use for rendering.
902	*
903	* KW: We now know orientation in advance and only shade for
904	* the side or sides which are actually required.
905	*
906	* Variables:
907	* n = normal vector
908	* V = vertex position
909	* P = light source position
910	* Pe = (0,0,0,1)
911	*
912	* Precomputed:
913	* IF P[3]==0 THEN
914	* // light at infinity
915	* IF local_viewer THEN
916	* VP_inf_norm = unit vector from V to P // Precompute
917	* ELSE
918	* // eye at infinity
919	* h_inf_norm = Normalize( VP + <0,0,1> ) // Precompute
920	* ENDIF
921	* ENDIF
922	*
923	* Functions:
924	* Normalize( v ) = normalized vector v
925	* Magnitude( v ) = length of vector v
926	*/
927
928
929
930	/*
931	* Whenever the spotlight exponent for a light changes we must call
932	* this function to recompute the exponent lookup table.
933	*/
934	void gl_compute_spot_exp_table( struct gl_light *l )
935	{
936	int i;
937	double exponent = l->SpotExponent;
938	double tmp = 0;
939	int clamp = 0;
940
941	l->SpotExpTable[0][0] = 0.0;
942
943	for (i=EXP_TABLE_SIZE-1;i>0;i--) {
944	if (clamp == 0) {
945	tmp = pow(i/(double)(EXP_TABLE_SIZE-1), exponent);
946	if (tmp < FLT_MIN*100.0) {
947	tmp = 0.0;
948	clamp = 1;
949	}
950	}
951	l->SpotExpTable[i][0] = tmp;
952	}
953	for (i=0;i<EXP_TABLE_SIZE-1;i++) {
954	l->SpotExpTable[i][1] = l->SpotExpTable[i+1][0] - l->SpotExpTable[i][0];
955	}
956	l->SpotExpTable[EXP_TABLE_SIZE-1][1] = 0.0;
957	}
958
959
960
961
962	/* Calculate a new shine table. Doing this here saves a branch in
963	* lighting, and the cost of doing it early may be partially offset
964	* by keeping a MRU cache of shine tables for various shine values.
965	*/
966	static void compute_shine_table( struct gl_shine_tab *tab, GLfloat shininess )
967	{
968	int i;
969	GLfloat *m = tab->tab;
970
971	m[0] = 0;
972	if (shininess == 0) {
973	for (i = 1 ; i <= SHINE_TABLE_SIZE ; i++)
974	m[i] = 1;
975	} else {
976	for (i = 1 ; i <= SHINE_TABLE_SIZE ; i++) {
977	double t = pow( i/(GLfloat)SHINE_TABLE_SIZE, shininess );
978	m[i] = 0;
979	if (t > 1e-20) m[i] = t;
980	}
981	}
982
983	tab->shininess = shininess;
984	}
985
986	#define DISTSQR(a,b) ((a-b)*(a-b))
987
988	void gl_compute_shine_table( GLcontext *ctx, GLuint i, GLfloat shininess )
989	{
990	struct gl_shine_tab *list = ctx->ShineTabList;
991	struct gl_shine_tab *s;
992
993	foreach(s, list)
994	if ( DISTSQR(s->shininess, shininess) < 1e-4 )
995	break;
996
997	if (s == list)
998	{
999	foreach(s, list)
1000	if (s->refcount == 0) break;
1001
1002	compute_shine_table( s, shininess );
1003	}
1004
1005	ctx->ShineTable[i]->refcount--;
1006	ctx->ShineTable[i] = s;
1007	move_to_tail( list, s );
1008	s->refcount++;
1009	}
1010
1011
1012
1013
1014	void gl_reinit_light_attrib( GLcontext ctx, struct gl_light_attrib l )
1015	{
1016	GLuint i;
1017
1018	if (ctx->ShineTable[0]->shininess != l->Material[0].Shininess) {
1019	gl_compute_shine_table( ctx, 0, l->Material[0].Shininess );
1020	gl_compute_shine_table( ctx, 2, l->Material[0].Shininess * .5 );
1021	}
1022
1023	if (ctx->ShineTable[1]->shininess != l->Material[1].Shininess) {
1024	gl_compute_shine_table( ctx, 1, l->Material[1].Shininess );
1025	gl_compute_shine_table( ctx, 3, l->Material[1].Shininess * .5 );
1026	}
1027
1028	make_empty_list( &l->EnabledList );
1029	for (i = 0 ; i < MAX_LIGHTS ; i++) {
1030	if (l->Light[i].Enabled)
1031	insert_at_tail( &l->EnabledList, &l->Light[i] );
1032	}
1033	}
1034
1035
1036
1037	/*
1038	* Examine current lighting parameters to determine if the optimized lighting
1039	* function can be used.
1040	* Also, precompute some lighting values such as the products of light
1041	* source and material ambient, diffuse and specular coefficients.
1042	*/
1043	void gl_update_lighting( GLcontext *ctx )
1044	{
1045	struct gl_light *light;
1046
1047	ctx->Light.Flags = 0;
1048
1049	foreach(light, &ctx->Light.EnabledList) {
1050
1051	light->Flags = 0;
1052
1053	if (light->EyePosition[3] != 0.0F)
1054	light->Flags \|= LIGHT_POSITIONAL;
1055
1056	if (LEN_SQUARED_3FV(light->Specular) > 1e-16)
1057	light->Flags \|= LIGHT_SPECULAR;
1058
1059	if (light->SpotCutoff != 180.0F)
1060	light->Flags \|= LIGHT_SPOT;
1061
1062	ctx->Light.Flags \|= light->Flags;
1063	}
1064
1065	ctx->Light.NeedVertices =
1066	((ctx->Light.Flags & (LIGHT_POSITIONAL\|LIGHT_SPOT)) \|\|
1067	(ctx->Light.Model.ColorControl == GL_SEPARATE_SPECULAR_COLOR) \|\|
1068	(ctx->Light.Model.LocalViewer && (ctx->Light.Flags & LIGHT_SPECULAR)));
1069
1070
1071	/* Precompute some shading values.
1072	*/
1073	if (ctx->Visual->RGBAflag)
1074	{
1075	GLuint sides = ((ctx->TriangleCaps & DD_TRI_LIGHT_TWOSIDE) ? 2 : 1);
1076	GLuint side;
1077	for (side=0; side < sides; side++) {
1078	struct gl_material *mat = &ctx->Light.Material[side];
1079
1080	COPY_3V(ctx->Light.BaseColor[side], mat->Emission);
1081	ACC_SCALE_3V(ctx->Light.BaseColor[side],
1082	ctx->Light.Model.Ambient,
1083	mat->Ambient);
1084
1085	FLOAT_COLOR_TO_UBYTE_COLOR(ctx->Light.BaseAlpha[side],
1086	ctx->Light.Material[side].Diffuse[3] );
1087	}
1088
1089	foreach (light, &ctx->Light.EnabledList) {
1090	for (side=0; side< sides; side++) {
1091	struct gl_material *mat = &ctx->Light.Material[side];
1092	SCALE_3V( light->MatDiffuse[side], light->Diffuse, mat->Diffuse );
1093	SCALE_3V( light->MatAmbient[side], light->Ambient, mat->Ambient );
1094	ACC_3V( ctx->Light.BaseColor[side], light->MatAmbient[side] );
1095	if (light->Flags & LIGHT_SPECULAR)
1096	{
1097	SCALE_3V( light->MatSpecular[side], light->Specular,
1098	mat->Specular);
1099	light->IsMatSpecular[side] =
1100	(LEN_SQUARED_3FV(light->MatSpecular[side]) > 1e-16);
1101	}
1102	else
1103	light->IsMatSpecular[side] = 0;
1104	}
1105	}
1106	}
1107	else
1108	{
1109	static GLfloat ci[3] = { .30, .59, .11 };
1110
1111	foreach(light, &ctx->Light.EnabledList) {
1112	light->dli = DOT3(ci, light->Diffuse);
1113	light->sli = DOT3(ci, light->Specular);
1114	}
1115	}
1116	}
1117
1118	/* Need to seriously restrict the circumstances under which these
1119	* calc's are performed.
1120	*/
1121	void gl_compute_light_positions( GLcontext *ctx )
1122	{
1123	struct gl_light *light;
1124
1125	if (ctx->Light.NeedVertices && !ctx->Light.Model.LocalViewer) {
1126	GLfloat eye_z[3] = { 0, 0, 1 };
1127	if (!ctx->NeedEyeCoords) {
1128	TRANSFORM_NORMAL( ctx->EyeZDir, eye_z, ctx->ModelView.m );
1129	} else {
1130	COPY_3V( ctx->EyeZDir, eye_z );
1131	}
1132	}
1133
1134	foreach (light, &ctx->Light.EnabledList) {
1135
1136	if (!ctx->NeedEyeCoords) {
1137	TRANSFORM_POINT( light->Position, ctx->ModelView.inv,
1138	light->EyePosition );
1139	} else {
1140	COPY_4FV( light->Position, light->EyePosition );
1141	}
1142
1143	if (!(light->Flags & LIGHT_POSITIONAL))
1144	{
1145	/* VP (VP) = Normalize( Position ) */
1146	COPY_3V( light->VP_inf_norm, light->Position );
1147	NORMALIZE_3FV( light->VP_inf_norm );
1148
1149	if (!ctx->Light.Model.LocalViewer)
1150	{
1151	/* h_inf_norm = Normalize( V_to_P + <0,0,1> ) */
1152	ADD_3V( light->h_inf_norm, light->VP_inf_norm, ctx->EyeZDir);
1153	NORMALIZE_3FV( light->h_inf_norm );
1154	}
1155
1156	light->VP_inf_spot_attenuation = 1.0;
1157	}
1158
1159	if (light->Flags & LIGHT_SPOT)
1160	{
1161	if (ctx->NeedEyeNormals) {
1162	COPY_3V( light->NormDirection, light->EyeDirection );
1163	} else {
1164	TRANSFORM_NORMAL( light->NormDirection,
1165	light->EyeDirection,
1166	ctx->ModelView.m);
1167	}
1168
1169	NORMALIZE_3FV( light->NormDirection );
1170
1171
1172	/* Unlikely occurrance?
1173	*/
1174	if (!(light->Flags & LIGHT_POSITIONAL)) {
1175	GLfloat PV_dot_dir = - DOT3(light->VP_inf_norm,
1176	light->NormDirection);
1177
1178	if (PV_dot_dir > light->CosCutoff) {
1179	double x = PV_dot_dir * (EXP_TABLE_SIZE-1);
1180	int k = (int) x;
1181	light->VP_inf_spot_attenuation =
1182	(light->SpotExpTable[k][0] +
1183	(x-k)*light->SpotExpTable[k][1]);
1184	}
1185	else
1186	light->VP_inf_spot_attenuation = 0;
1187	}
1188	}
1189	}
1190	}
1191
1192
1193
1194
1195
1196	void gl_update_normal_transform( GLcontext *ctx )
1197	{
1198	GLuint new_flag = 0;
1199	normal_func *last = ctx->NormalTransform;
1200
1201	ctx->vb_rescale_factor = 1.0;
1202
1203	if (ctx->NeedEyeCoords) {
1204	if (ctx->NeedNormals) {
1205	GLuint transform = NORM_TRANSFORM_NO_ROT;
1206
1207	if (ctx->ModelView.flags & (MAT_FLAG_GENERAL \|
1208	MAT_FLAG_ROTATION \|
1209	MAT_FLAG_GENERAL_3D \|
1210	MAT_FLAG_PERSPECTIVE))
1211	transform = NORM_TRANSFORM;
1212
1213
1214	new_flag = ctx->NewState & NEW_MODELVIEW;
1215	ctx->vb_rescale_factor = ctx->rescale_factor;
1216
1217	if (ctx->Transform.Normalize)
1218	{
1219	ctx->NormalTransform = gl_normal_tab[transform \| NORM_NORMALIZE];
1220	}
1221	else if (ctx->Transform.RescaleNormals &&
1222	ctx->rescale_factor != 1.0)
1223	{
1224	ctx->NormalTransform = gl_normal_tab[transform \| NORM_RESCALE];
1225	}
1226	else
1227	{
1228	ctx->NormalTransform = gl_normal_tab[transform];
1229	}
1230	} else {
1231	ctx->NormalTransform = 0;
1232	}
1233	}
1234	else {
1235	if (ctx->NeedNormals) {
1236	ctx->vb_rescale_factor = 1.0/ctx->rescale_factor;
1237
1238	if (ctx->Transform.Normalize)
1239	{
1240	ctx->NormalTransform = gl_normal_tab[NORM_NORMALIZE];
1241	}
1242	else if (!ctx->Transform.RescaleNormals &&
1243	ctx->rescale_factor != 1.0)
1244	{
1245	ctx->NormalTransform = gl_normal_tab[NORM_RESCALE];
1246	}
1247	else
1248	{
1249	ctx->NormalTransform = 0;
1250	}
1251	} else {
1252	ctx->NormalTransform = 0;
1253	}
1254	}
1255
1256	if (last != ctx->NormalTransform \|\| new_flag)
1257	ctx->NewState \|= NEW_NORMAL_TRANSFORM;
1258	}
1259

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