texgen.c revision f329adfa497b6b2e0a125ab98a38c656a017270d 
1/*
2 * Mesa 3-D graphics library
3 * Version:  7.5
4 *
5 * Copyright (C) 1999-2008  Brian Paul   All Rights Reserved.
6 * Copyright (C) 2009  VMware, Inc.  All Rights Reserved.
7 *
8 * Permission is hereby granted, free of charge, to any person obtaining a
9 * copy of this software and associated documentation files (the "Software"),
10 * to deal in the Software without restriction, including without limitation
11 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
12 * and/or sell copies of the Software, and to permit persons to whom the
13 * Software is furnished to do so, subject to the following conditions:
14 *
15 * The above copyright notice and this permission notice shall be included
16 * in all copies or substantial portions of the Software.
17 *
18 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
19 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
20 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
21 * BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
22 * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
23 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
24 */
25
26/**
27 * \file texgen.c
28 *
29 * glTexGen-related functions
30 */
31
32
33#include "main/glheader.h"
34#include "main/context.h"
35#include "main/enums.h"
36#include "main/macros.h"
37#include "main/mfeatures.h"
38#include "main/texgen.h"
39#include "main/texstate.h"
40#include "math/m_matrix.h"
41#include "main/dispatch.h"
42
43
44#if FEATURE_texgen
45
46
47/**
48 * Return texgen state for given coordinate
49 */
50static struct gl_texgen *
51get_texgen(struct gl_context *ctx, struct gl_texture_unit *texUnit,
52           GLenum coord)
53{
54   if (ctx->API == API_OPENGLES) {
55      return (coord == GL_TEXTURE_GEN_STR_OES)
56         ? &texUnit->GenS : NULL;
57   }
58
59   switch (coord) {
60   case GL_S:
61      return &texUnit->GenS;
62   case GL_T:
63      return &texUnit->GenT;
64   case GL_R:
65      return &texUnit->GenR;
66   case GL_Q:
67      return &texUnit->GenQ;
68   default:
69      return NULL;
70   }
71}
72
73
74void GLAPIENTRY
75_mesa_TexGenfv( GLenum coord, GLenum pname, const GLfloat *params )
76{
77   struct gl_texture_unit *texUnit;
78   struct gl_texgen *texgen;
79   GET_CURRENT_CONTEXT(ctx);
80   ASSERT_OUTSIDE_BEGIN_END(ctx);
81
82   if (MESA_VERBOSE&(VERBOSE_API|VERBOSE_TEXTURE))
83      _mesa_debug(ctx, "glTexGen %s %s %.1f(%s)...\n",
84                  _mesa_lookup_enum_by_nr(coord),
85                  _mesa_lookup_enum_by_nr(pname),
86                  *params,
87		  _mesa_lookup_enum_by_nr((GLenum) (GLint) *params));
88
89   if (ctx->Texture.CurrentUnit >= ctx->Const.MaxTextureCoordUnits) {
90      _mesa_error(ctx, GL_INVALID_OPERATION, "glTexGen(current unit)");
91      return;
92   }
93
94   texUnit = _mesa_get_current_tex_unit(ctx);
95
96   texgen = get_texgen(ctx, texUnit, coord);
97   if (!texgen) {
98      _mesa_error(ctx, GL_INVALID_ENUM, "glTexGen(coord)");
99      return;
100   }
101
102   switch (pname) {
103   case GL_TEXTURE_GEN_MODE:
104      {
105         GLenum mode = (GLenum) (GLint) params[0];
106         GLbitfield bit = 0x0;
107         if (texgen->Mode == mode)
108            return;
109         switch (mode) {
110         case GL_OBJECT_LINEAR:
111            bit = TEXGEN_OBJ_LINEAR;
112            break;
113         case GL_EYE_LINEAR:
114            bit = TEXGEN_EYE_LINEAR;
115            break;
116         case GL_SPHERE_MAP:
117            if (coord == GL_S || coord == GL_T)
118               bit = TEXGEN_SPHERE_MAP;
119            break;
120         case GL_REFLECTION_MAP_NV:
121            if (coord != GL_Q)
122               bit = TEXGEN_REFLECTION_MAP_NV;
123            break;
124         case GL_NORMAL_MAP_NV:
125            if (coord != GL_Q)
126               bit = TEXGEN_NORMAL_MAP_NV;
127            break;
128         default:
129            ; /* nop */
130         }
131         if (!bit) {
132            _mesa_error( ctx, GL_INVALID_ENUM, "glTexGenfv(param)" );
133            return;
134         }
135         if (ctx->API != API_OPENGL
136             && (bit & (TEXGEN_REFLECTION_MAP_NV | TEXGEN_NORMAL_MAP_NV)) == 0) {
137            _mesa_error( ctx, GL_INVALID_ENUM, "glTexGenfv(param)" );
138            return;
139         }
140
141         FLUSH_VERTICES(ctx, _NEW_TEXTURE);
142         texgen->Mode = mode;
143         texgen->_ModeBit = bit;
144      }
145      break;
146
147   case GL_OBJECT_PLANE:
148      {
149         if (ctx->API != API_OPENGL) {
150            _mesa_error( ctx, GL_INVALID_ENUM, "glTexGenfv(param)" );
151            return;
152         }
153         if (TEST_EQ_4V(texgen->ObjectPlane, params))
154            return;
155         FLUSH_VERTICES(ctx, _NEW_TEXTURE);
156         COPY_4FV(texgen->ObjectPlane, params);
157      }
158      break;
159
160   case GL_EYE_PLANE:
161      {
162         GLfloat tmp[4];
163
164         if (ctx->API != API_OPENGL) {
165            _mesa_error( ctx, GL_INVALID_ENUM, "glTexGenfv(param)" );
166            return;
167         }
168
169         /* Transform plane equation by the inverse modelview matrix */
170         if (_math_matrix_is_dirty(ctx->ModelviewMatrixStack.Top)) {
171            _math_matrix_analyse(ctx->ModelviewMatrixStack.Top);
172         }
173         _mesa_transform_vector(tmp, params,
174                                ctx->ModelviewMatrixStack.Top->inv);
175         if (TEST_EQ_4V(texgen->EyePlane, tmp))
176            return;
177         FLUSH_VERTICES(ctx, _NEW_TEXTURE);
178         COPY_4FV(texgen->EyePlane, tmp);
179      }
180      break;
181
182   default:
183      _mesa_error( ctx, GL_INVALID_ENUM, "glTexGenfv(pname)" );
184      return;
185   }
186
187   if (ctx->Driver.TexGen)
188      ctx->Driver.TexGen( ctx, coord, pname, params );
189}
190
191
192static void GLAPIENTRY
193_mesa_TexGeniv(GLenum coord, GLenum pname, const GLint *params )
194{
195   GLfloat p[4];
196   p[0] = (GLfloat) params[0];
197   if (pname == GL_TEXTURE_GEN_MODE) {
198      p[1] = p[2] = p[3] = 0.0F;
199   }
200   else {
201      p[1] = (GLfloat) params[1];
202      p[2] = (GLfloat) params[2];
203      p[3] = (GLfloat) params[3];
204   }
205   _mesa_TexGenfv(coord, pname, p);
206}
207
208
209static void GLAPIENTRY
210_mesa_TexGend(GLenum coord, GLenum pname, GLdouble param )
211{
212   GLfloat p[4];
213   p[0] = (GLfloat) param;
214   p[1] = p[2] = p[3] = 0.0F;
215   _mesa_TexGenfv( coord, pname, p );
216}
217
218#if FEATURE_ES1
219
220void GLAPIENTRY
221_es_GetTexGenfv(GLenum coord, GLenum pname, GLfloat *params)
222{
223   ASSERT(coord == GL_TEXTURE_GEN_STR_OES);
224   _mesa_GetTexGenfv(GL_S, pname, params);
225}
226
227
228void GLAPIENTRY
229_es_TexGenf(GLenum coord, GLenum pname, GLfloat param)
230{
231   if (coord != GL_TEXTURE_GEN_STR_OES) {
232      GET_CURRENT_CONTEXT(ctx);
233      _mesa_error( ctx, GL_INVALID_ENUM, "glTexGen[fx](pname)" );
234      return;
235   }
236   /* set S, T, and R at the same time */
237   _mesa_TexGenf(GL_S, pname, param);
238   _mesa_TexGenf(GL_T, pname, param);
239   _mesa_TexGenf(GL_R, pname, param);
240}
241
242
243void GLAPIENTRY
244_es_TexGenfv(GLenum coord, GLenum pname, const GLfloat *params)
245{
246   if (coord != GL_TEXTURE_GEN_STR_OES) {
247      GET_CURRENT_CONTEXT(ctx);
248      _mesa_error( ctx, GL_INVALID_ENUM, "glTexGen[fx]v(pname)" );
249      return;
250   }
251   /* set S, T, and R at the same time */
252   _mesa_TexGenfv(GL_S, pname, params);
253   _mesa_TexGenfv(GL_T, pname, params);
254   _mesa_TexGenfv(GL_R, pname, params);
255}
256
257#endif
258
259static void GLAPIENTRY
260_mesa_TexGendv(GLenum coord, GLenum pname, const GLdouble *params )
261{
262   GLfloat p[4];
263   p[0] = (GLfloat) params[0];
264   if (pname == GL_TEXTURE_GEN_MODE) {
265      p[1] = p[2] = p[3] = 0.0F;
266   }
267   else {
268      p[1] = (GLfloat) params[1];
269      p[2] = (GLfloat) params[2];
270      p[3] = (GLfloat) params[3];
271   }
272   _mesa_TexGenfv( coord, pname, p );
273}
274
275
276void GLAPIENTRY
277_mesa_TexGenf( GLenum coord, GLenum pname, GLfloat param )
278{
279   GLfloat p[4];
280   p[0] = param;
281   p[1] = p[2] = p[3] = 0.0F;
282   _mesa_TexGenfv(coord, pname, p);
283}
284
285
286void GLAPIENTRY
287_mesa_TexGeni( GLenum coord, GLenum pname, GLint param )
288{
289   GLint p[4];
290   p[0] = param;
291   p[1] = p[2] = p[3] = 0;
292   _mesa_TexGeniv( coord, pname, p );
293}
294
295
296
297static void GLAPIENTRY
298_mesa_GetTexGendv( GLenum coord, GLenum pname, GLdouble *params )
299{
300   struct gl_texture_unit *texUnit;
301   struct gl_texgen *texgen;
302   GET_CURRENT_CONTEXT(ctx);
303   ASSERT_OUTSIDE_BEGIN_END(ctx);
304
305   if (ctx->Texture.CurrentUnit >= ctx->Const.MaxTextureCoordUnits) {
306      _mesa_error(ctx, GL_INVALID_OPERATION, "glGetTexGendv(current unit)");
307      return;
308   }
309
310   texUnit = _mesa_get_current_tex_unit(ctx);
311
312   texgen = get_texgen(ctx, texUnit, coord);
313   if (!texgen) {
314      _mesa_error(ctx, GL_INVALID_ENUM, "glGetTexGendv(coord)");
315      return;
316   }
317
318   switch (pname) {
319   case GL_TEXTURE_GEN_MODE:
320      params[0] = ENUM_TO_DOUBLE(texgen->Mode);
321      break;
322   case GL_OBJECT_PLANE:
323      COPY_4V(params, texgen->ObjectPlane);
324      break;
325   case GL_EYE_PLANE:
326      COPY_4V(params, texgen->EyePlane);
327      break;
328   default:
329      _mesa_error( ctx, GL_INVALID_ENUM, "glGetTexGendv(pname)" );
330   }
331}
332
333
334
335void GLAPIENTRY
336_mesa_GetTexGenfv( GLenum coord, GLenum pname, GLfloat *params )
337{
338   struct gl_texture_unit *texUnit;
339   struct gl_texgen *texgen;
340   GET_CURRENT_CONTEXT(ctx);
341   ASSERT_OUTSIDE_BEGIN_END(ctx);
342
343   if (ctx->Texture.CurrentUnit >= ctx->Const.MaxTextureCoordUnits) {
344      _mesa_error(ctx, GL_INVALID_OPERATION, "glGetTexGenfv(current unit)");
345      return;
346   }
347
348   texUnit = _mesa_get_current_tex_unit(ctx);
349
350   texgen = get_texgen(ctx, texUnit, coord);
351   if (!texgen) {
352      _mesa_error(ctx, GL_INVALID_ENUM, "glGetTexGenfv(coord)");
353      return;
354   }
355
356   switch (pname) {
357   case GL_TEXTURE_GEN_MODE:
358      params[0] = ENUM_TO_FLOAT(texgen->Mode);
359      break;
360   case GL_OBJECT_PLANE:
361      COPY_4V(params, texgen->ObjectPlane);
362      break;
363   case GL_EYE_PLANE:
364      COPY_4V(params, texgen->EyePlane);
365      break;
366   default:
367      _mesa_error( ctx, GL_INVALID_ENUM, "glGetTexGenfv(pname)" );
368   }
369}
370
371
372
373static void GLAPIENTRY
374_mesa_GetTexGeniv( GLenum coord, GLenum pname, GLint *params )
375{
376   struct gl_texture_unit *texUnit;
377   struct gl_texgen *texgen;
378   GET_CURRENT_CONTEXT(ctx);
379   ASSERT_OUTSIDE_BEGIN_END(ctx);
380
381   if (ctx->Texture.CurrentUnit >= ctx->Const.MaxTextureCoordUnits) {
382      _mesa_error(ctx, GL_INVALID_OPERATION, "glGetTexGeniv(current unit)");
383      return;
384   }
385
386   texUnit = _mesa_get_current_tex_unit(ctx);
387
388   texgen = get_texgen(ctx, texUnit, coord);
389   if (!texgen) {
390      _mesa_error(ctx, GL_INVALID_ENUM, "glGetTexGeniv(coord)");
391      return;
392   }
393
394   switch (pname) {
395   case GL_TEXTURE_GEN_MODE:
396      params[0] = texgen->Mode;
397      break;
398   case GL_OBJECT_PLANE:
399      params[0] = (GLint) texgen->ObjectPlane[0];
400      params[1] = (GLint) texgen->ObjectPlane[1];
401      params[2] = (GLint) texgen->ObjectPlane[2];
402      params[3] = (GLint) texgen->ObjectPlane[3];
403      break;
404   case GL_EYE_PLANE:
405      params[0] = (GLint) texgen->EyePlane[0];
406      params[1] = (GLint) texgen->EyePlane[1];
407      params[2] = (GLint) texgen->EyePlane[2];
408      params[3] = (GLint) texgen->EyePlane[3];
409      break;
410   default:
411      _mesa_error( ctx, GL_INVALID_ENUM, "glGetTexGeniv(pname)" );
412   }
413}
414
415
416void
417_mesa_init_texgen_dispatch(struct _glapi_table *disp)
418{
419   SET_GetTexGendv(disp, _mesa_GetTexGendv);
420   SET_GetTexGenfv(disp, _mesa_GetTexGenfv);
421   SET_GetTexGeniv(disp, _mesa_GetTexGeniv);
422   SET_TexGend(disp, _mesa_TexGend);
423   SET_TexGendv(disp, _mesa_TexGendv);
424   SET_TexGenf(disp, _mesa_TexGenf);
425   SET_TexGenfv(disp, _mesa_TexGenfv);
426   SET_TexGeni(disp, _mesa_TexGeni);
427   SET_TexGeniv(disp, _mesa_TexGeniv);
428}
429
430
431#endif /* FEATURE_texgen */
432