texgen.c revision b8e80941 
1/*
2 * Mesa 3-D graphics library
3 *
4 * Copyright (C) 1999-2008  Brian Paul   All Rights Reserved.
5 * Copyright (C) 2009  VMware, Inc.  All Rights Reserved.
6 *
7 * Permission is hereby granted, free of charge, to any person obtaining a
8 * copy of this software and associated documentation files (the "Software"),
9 * to deal in the Software without restriction, including without limitation
10 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
11 * and/or sell copies of the Software, and to permit persons to whom the
12 * Software is furnished to do so, subject to the following conditions:
13 *
14 * The above copyright notice and this permission notice shall be included
15 * in all copies or substantial portions of the Software.
16 *
17 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
18 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
19 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
20 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
21 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
22 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
23 * 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/texgen.h"
38#include "main/texstate.h"
39#include "math/m_matrix.h"
40
41
42/**
43 * Return texgen state for given coordinate
44 */
45static struct gl_texgen *
46get_texgen(struct gl_context *ctx, struct gl_fixedfunc_texture_unit *texUnit,
47           GLenum coord)
48{
49   if (ctx->API == API_OPENGLES) {
50      return (coord == GL_TEXTURE_GEN_STR_OES)
51         ? &texUnit->GenS : NULL;
52   }
53
54   switch (coord) {
55   case GL_S:
56      return &texUnit->GenS;
57   case GL_T:
58      return &texUnit->GenT;
59   case GL_R:
60      return &texUnit->GenR;
61   case GL_Q:
62      return &texUnit->GenQ;
63   default:
64      return NULL;
65   }
66}
67
68
69void GLAPIENTRY
70_mesa_TexGenfv( GLenum coord, GLenum pname, const GLfloat *params )
71{
72   struct gl_fixedfunc_texture_unit *texUnit;
73   struct gl_texgen *texgen;
74   GET_CURRENT_CONTEXT(ctx);
75
76   if (MESA_VERBOSE&(VERBOSE_API|VERBOSE_TEXTURE))
77      _mesa_debug(ctx, "glTexGen %s %s %.1f(%s)...\n",
78                  _mesa_enum_to_string(coord),
79                  _mesa_enum_to_string(pname),
80                  *params,
81		  _mesa_enum_to_string((GLenum) (GLint) *params));
82
83   if (ctx->Texture.CurrentUnit >= ctx->Const.MaxTextureCoordUnits) {
84      _mesa_error(ctx, GL_INVALID_OPERATION, "glTexGen(current unit)");
85      return;
86   }
87
88   texUnit = _mesa_get_current_fixedfunc_tex_unit(ctx);
89
90   texgen = get_texgen(ctx, texUnit, coord);
91   if (!texgen) {
92      _mesa_error(ctx, GL_INVALID_ENUM, "glTexGen(coord)");
93      return;
94   }
95
96   switch (pname) {
97   case GL_TEXTURE_GEN_MODE:
98      {
99         GLenum mode = (GLenum) (GLint) params[0];
100         GLbitfield bit = 0x0;
101         if (texgen->Mode == mode)
102            return;
103         switch (mode) {
104         case GL_OBJECT_LINEAR:
105            bit = TEXGEN_OBJ_LINEAR;
106            break;
107         case GL_EYE_LINEAR:
108            bit = TEXGEN_EYE_LINEAR;
109            break;
110         case GL_SPHERE_MAP:
111            if (coord == GL_S || coord == GL_T)
112               bit = TEXGEN_SPHERE_MAP;
113            break;
114         case GL_REFLECTION_MAP_NV:
115            if (coord != GL_Q)
116               bit = TEXGEN_REFLECTION_MAP_NV;
117            break;
118         case GL_NORMAL_MAP_NV:
119            if (coord != GL_Q)
120               bit = TEXGEN_NORMAL_MAP_NV;
121            break;
122         default:
123            ; /* nop */
124         }
125         if (!bit) {
126            _mesa_error( ctx, GL_INVALID_ENUM, "glTexGenfv(param)" );
127            return;
128         }
129         if (ctx->API != API_OPENGL_COMPAT
130             && (bit & (TEXGEN_REFLECTION_MAP_NV | TEXGEN_NORMAL_MAP_NV)) == 0) {
131            _mesa_error( ctx, GL_INVALID_ENUM, "glTexGenfv(param)" );
132            return;
133         }
134
135         FLUSH_VERTICES(ctx, _NEW_TEXTURE_STATE);
136         texgen->Mode = mode;
137         texgen->_ModeBit = bit;
138      }
139      break;
140
141   case GL_OBJECT_PLANE:
142      {
143         if (ctx->API != API_OPENGL_COMPAT) {
144            _mesa_error( ctx, GL_INVALID_ENUM, "glTexGenfv(param)" );
145            return;
146         }
147         if (TEST_EQ_4V(texgen->ObjectPlane, params))
148            return;
149         FLUSH_VERTICES(ctx, _NEW_TEXTURE_STATE);
150         COPY_4FV(texgen->ObjectPlane, params);
151      }
152      break;
153
154   case GL_EYE_PLANE:
155      {
156         GLfloat tmp[4];
157
158         if (ctx->API != API_OPENGL_COMPAT) {
159            _mesa_error( ctx, GL_INVALID_ENUM, "glTexGenfv(param)" );
160            return;
161         }
162
163         /* Transform plane equation by the inverse modelview matrix */
164         if (_math_matrix_is_dirty(ctx->ModelviewMatrixStack.Top)) {
165            _math_matrix_analyse(ctx->ModelviewMatrixStack.Top);
166         }
167         _mesa_transform_vector(tmp, params,
168                                ctx->ModelviewMatrixStack.Top->inv);
169         if (TEST_EQ_4V(texgen->EyePlane, tmp))
170            return;
171         FLUSH_VERTICES(ctx, _NEW_TEXTURE_STATE);
172         COPY_4FV(texgen->EyePlane, tmp);
173      }
174      break;
175
176   default:
177      _mesa_error( ctx, GL_INVALID_ENUM, "glTexGenfv(pname)" );
178      return;
179   }
180
181   if (ctx->Driver.TexGen)
182      ctx->Driver.TexGen( ctx, coord, pname, params );
183}
184
185
186void GLAPIENTRY
187_mesa_TexGeniv(GLenum coord, GLenum pname, const GLint *params )
188{
189   GLfloat p[4];
190   p[0] = (GLfloat) params[0];
191   if (pname == GL_TEXTURE_GEN_MODE) {
192      p[1] = p[2] = p[3] = 0.0F;
193   }
194   else {
195      p[1] = (GLfloat) params[1];
196      p[2] = (GLfloat) params[2];
197      p[3] = (GLfloat) params[3];
198   }
199   _mesa_TexGenfv(coord, pname, p);
200}
201
202
203void GLAPIENTRY
204_mesa_TexGend(GLenum coord, GLenum pname, GLdouble param )
205{
206   GLfloat p[4];
207   p[0] = (GLfloat) param;
208   p[1] = p[2] = p[3] = 0.0F;
209   _mesa_TexGenfv( coord, pname, p );
210}
211
212
213void GLAPIENTRY
214_es_GetTexGenfv(GLenum coord, GLenum pname, GLfloat *params)
215{
216   _mesa_GetTexGenfv(GL_S, pname, params);
217}
218
219
220void GLAPIENTRY
221_es_TexGenf(GLenum coord, GLenum pname, GLfloat param)
222{
223   if (coord != GL_TEXTURE_GEN_STR_OES) {
224      GET_CURRENT_CONTEXT(ctx);
225      _mesa_error( ctx, GL_INVALID_ENUM, "glTexGen[fx](pname)" );
226      return;
227   }
228   /* set S, T, and R at the same time */
229   _mesa_TexGenf(GL_S, pname, param);
230   _mesa_TexGenf(GL_T, pname, param);
231   _mesa_TexGenf(GL_R, pname, param);
232}
233
234
235void GLAPIENTRY
236_es_TexGenfv(GLenum coord, GLenum pname, const GLfloat *params)
237{
238   if (coord != GL_TEXTURE_GEN_STR_OES) {
239      GET_CURRENT_CONTEXT(ctx);
240      _mesa_error( ctx, GL_INVALID_ENUM, "glTexGen[fx]v(pname)" );
241      return;
242   }
243   /* set S, T, and R at the same time */
244   _mesa_TexGenfv(GL_S, pname, params);
245   _mesa_TexGenfv(GL_T, pname, params);
246   _mesa_TexGenfv(GL_R, pname, params);
247}
248
249
250void GLAPIENTRY
251_mesa_TexGendv(GLenum coord, GLenum pname, const GLdouble *params )
252{
253   GLfloat p[4];
254   p[0] = (GLfloat) params[0];
255   if (pname == GL_TEXTURE_GEN_MODE) {
256      p[1] = p[2] = p[3] = 0.0F;
257   }
258   else {
259      p[1] = (GLfloat) params[1];
260      p[2] = (GLfloat) params[2];
261      p[3] = (GLfloat) params[3];
262   }
263   _mesa_TexGenfv( coord, pname, p );
264}
265
266
267void GLAPIENTRY
268_mesa_TexGenf( GLenum coord, GLenum pname, GLfloat param )
269{
270   GLfloat p[4];
271   p[0] = param;
272   p[1] = p[2] = p[3] = 0.0F;
273   _mesa_TexGenfv(coord, pname, p);
274}
275
276
277void GLAPIENTRY
278_mesa_TexGeni( GLenum coord, GLenum pname, GLint param )
279{
280   GLint p[4];
281   p[0] = param;
282   p[1] = p[2] = p[3] = 0;
283   _mesa_TexGeniv( coord, pname, p );
284}
285
286
287
288void GLAPIENTRY
289_mesa_GetTexGendv( GLenum coord, GLenum pname, GLdouble *params )
290{
291   struct gl_fixedfunc_texture_unit *texUnit;
292   struct gl_texgen *texgen;
293   GET_CURRENT_CONTEXT(ctx);
294
295   if (ctx->Texture.CurrentUnit >= ctx->Const.MaxTextureCoordUnits) {
296      _mesa_error(ctx, GL_INVALID_OPERATION, "glGetTexGendv(current unit)");
297      return;
298   }
299
300   texUnit = _mesa_get_current_fixedfunc_tex_unit(ctx);
301
302   texgen = get_texgen(ctx, texUnit, coord);
303   if (!texgen) {
304      _mesa_error(ctx, GL_INVALID_ENUM, "glGetTexGendv(coord)");
305      return;
306   }
307
308   switch (pname) {
309   case GL_TEXTURE_GEN_MODE:
310      params[0] = ENUM_TO_DOUBLE(texgen->Mode);
311      break;
312   case GL_OBJECT_PLANE:
313      COPY_4V(params, texgen->ObjectPlane);
314      break;
315   case GL_EYE_PLANE:
316      COPY_4V(params, texgen->EyePlane);
317      break;
318   default:
319      _mesa_error( ctx, GL_INVALID_ENUM, "glGetTexGendv(pname)" );
320   }
321}
322
323
324
325void GLAPIENTRY
326_mesa_GetTexGenfv( GLenum coord, GLenum pname, GLfloat *params )
327{
328   struct gl_fixedfunc_texture_unit *texUnit;
329   struct gl_texgen *texgen;
330   GET_CURRENT_CONTEXT(ctx);
331
332   if (ctx->Texture.CurrentUnit >= ctx->Const.MaxTextureCoordUnits) {
333      _mesa_error(ctx, GL_INVALID_OPERATION, "glGetTexGenfv(current unit)");
334      return;
335   }
336
337   texUnit = _mesa_get_current_fixedfunc_tex_unit(ctx);
338
339   texgen = get_texgen(ctx, texUnit, coord);
340   if (!texgen) {
341      _mesa_error(ctx, GL_INVALID_ENUM, "glGetTexGenfv(coord)");
342      return;
343   }
344
345   switch (pname) {
346   case GL_TEXTURE_GEN_MODE:
347      params[0] = ENUM_TO_FLOAT(texgen->Mode);
348      break;
349   case GL_OBJECT_PLANE:
350      if (ctx->API != API_OPENGL_COMPAT) {
351         _mesa_error( ctx, GL_INVALID_ENUM, "glGetTexGenfv(param)" );
352         return;
353      }
354      COPY_4V(params, texgen->ObjectPlane);
355      break;
356   case GL_EYE_PLANE:
357      if (ctx->API != API_OPENGL_COMPAT) {
358         _mesa_error( ctx, GL_INVALID_ENUM, "glGetTexGenfv(param)" );
359         return;
360      }
361      COPY_4V(params, texgen->EyePlane);
362      break;
363   default:
364      _mesa_error( ctx, GL_INVALID_ENUM, "glGetTexGenfv(pname)" );
365   }
366}
367
368
369
370void GLAPIENTRY
371_mesa_GetTexGeniv( GLenum coord, GLenum pname, GLint *params )
372{
373   struct gl_fixedfunc_texture_unit *texUnit;
374   struct gl_texgen *texgen;
375   GET_CURRENT_CONTEXT(ctx);
376
377   if (ctx->Texture.CurrentUnit >= ctx->Const.MaxTextureCoordUnits) {
378      _mesa_error(ctx, GL_INVALID_OPERATION, "glGetTexGeniv(current unit)");
379      return;
380   }
381
382   texUnit = _mesa_get_current_fixedfunc_tex_unit(ctx);
383
384   texgen = get_texgen(ctx, texUnit, coord);
385   if (!texgen) {
386      _mesa_error(ctx, GL_INVALID_ENUM, "glGetTexGeniv(coord)");
387      return;
388   }
389
390   switch (pname) {
391   case GL_TEXTURE_GEN_MODE:
392      params[0] = texgen->Mode;
393      break;
394   case GL_OBJECT_PLANE:
395      if (ctx->API != API_OPENGL_COMPAT) {
396         _mesa_error( ctx, GL_INVALID_ENUM, "glGetTexGeniv(param)" );
397         return;
398      }
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      if (ctx->API != API_OPENGL_COMPAT) {
406         _mesa_error( ctx, GL_INVALID_ENUM, "glGetTexGeniv(param)" );
407         return;
408      }
409      params[0] = (GLint) texgen->EyePlane[0];
410      params[1] = (GLint) texgen->EyePlane[1];
411      params[2] = (GLint) texgen->EyePlane[2];
412      params[3] = (GLint) texgen->EyePlane[3];
413      break;
414   default:
415      _mesa_error( ctx, GL_INVALID_ENUM, "glGetTexGeniv(pname)" );
416   }
417}
418