texgen.c revision db61b9ce39bccc43140357652ceb78baaf2aea44 
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_texture_unit *texUnit, GLenum coord)
52{
53   switch (coord) {
54   case GL_S:
55      return &texUnit->GenS;
56   case GL_T:
57      return &texUnit->GenT;
58   case GL_R:
59      return &texUnit->GenR;
60   case GL_Q:
61      return &texUnit->GenQ;
62   default:
63      return NULL;
64   }
65}
66
67
68void GLAPIENTRY
69_mesa_TexGenfv( GLenum coord, GLenum pname, const GLfloat *params )
70{
71   struct gl_texture_unit *texUnit;
72   struct gl_texgen *texgen;
73   GET_CURRENT_CONTEXT(ctx);
74   ASSERT_OUTSIDE_BEGIN_END(ctx);
75
76   if (MESA_VERBOSE&(VERBOSE_API|VERBOSE_TEXTURE))
77      _mesa_debug(ctx, "glTexGen %s %s %.1f(%s)...\n",
78                  _mesa_lookup_enum_by_nr(coord),
79                  _mesa_lookup_enum_by_nr(pname),
80                  *params,
81		  _mesa_lookup_enum_by_nr((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_tex_unit(ctx);
89
90   texgen = get_texgen(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         FLUSH_VERTICES(ctx, _NEW_TEXTURE);
130         texgen->Mode = mode;
131         texgen->_ModeBit = bit;
132      }
133      break;
134
135   case GL_OBJECT_PLANE:
136      {
137         if (TEST_EQ_4V(texgen->ObjectPlane, params))
138            return;
139         FLUSH_VERTICES(ctx, _NEW_TEXTURE);
140         COPY_4FV(texgen->ObjectPlane, params);
141      }
142      break;
143
144   case GL_EYE_PLANE:
145      {
146         GLfloat tmp[4];
147         /* Transform plane equation by the inverse modelview matrix */
148         if (_math_matrix_is_dirty(ctx->ModelviewMatrixStack.Top)) {
149            _math_matrix_analyse(ctx->ModelviewMatrixStack.Top);
150         }
151         _mesa_transform_vector(tmp, params,
152                                ctx->ModelviewMatrixStack.Top->inv);
153         if (TEST_EQ_4V(texgen->EyePlane, tmp))
154            return;
155         FLUSH_VERTICES(ctx, _NEW_TEXTURE);
156         COPY_4FV(texgen->EyePlane, tmp);
157      }
158      break;
159
160   default:
161      _mesa_error( ctx, GL_INVALID_ENUM, "glTexGenfv(pname)" );
162      return;
163   }
164
165   if (ctx->Driver.TexGen)
166      ctx->Driver.TexGen( ctx, coord, pname, params );
167}
168
169
170static void GLAPIENTRY
171_mesa_TexGeniv(GLenum coord, GLenum pname, const GLint *params )
172{
173   GLfloat p[4];
174   p[0] = (GLfloat) params[0];
175   if (pname == GL_TEXTURE_GEN_MODE) {
176      p[1] = p[2] = p[3] = 0.0F;
177   }
178   else {
179      p[1] = (GLfloat) params[1];
180      p[2] = (GLfloat) params[2];
181      p[3] = (GLfloat) params[3];
182   }
183   _mesa_TexGenfv(coord, pname, p);
184}
185
186
187static void GLAPIENTRY
188_mesa_TexGend(GLenum coord, GLenum pname, GLdouble param )
189{
190   GLfloat p[4];
191   p[0] = (GLfloat) param;
192   p[1] = p[2] = p[3] = 0.0F;
193   _mesa_TexGenfv( coord, pname, p );
194}
195
196#if FEATURE_ES1
197
198void GLAPIENTRY
199_es_GetTexGenfv(GLenum coord, GLenum pname, GLfloat *params)
200{
201   ASSERT(coord == GL_TEXTURE_GEN_STR_OES);
202   _mesa_GetTexGenfv(GL_S, pname, params);
203}
204
205
206void GLAPIENTRY
207_es_TexGenf(GLenum coord, GLenum pname, GLfloat param)
208{
209   ASSERT(coord == GL_TEXTURE_GEN_STR_OES);
210   /* set S, T, and R at the same time */
211   _mesa_TexGenf(GL_S, pname, param);
212   _mesa_TexGenf(GL_T, pname, param);
213   _mesa_TexGenf(GL_R, pname, param);
214}
215
216
217void GLAPIENTRY
218_es_TexGenfv(GLenum coord, GLenum pname, const GLfloat *params)
219{
220   ASSERT(coord == GL_TEXTURE_GEN_STR_OES);
221   /* set S, T, and R at the same time */
222   _mesa_TexGenfv(GL_S, pname, params);
223   _mesa_TexGenfv(GL_T, pname, params);
224   _mesa_TexGenfv(GL_R, pname, params);
225}
226
227#endif
228
229static void GLAPIENTRY
230_mesa_TexGendv(GLenum coord, GLenum pname, const GLdouble *params )
231{
232   GLfloat p[4];
233   p[0] = (GLfloat) params[0];
234   if (pname == GL_TEXTURE_GEN_MODE) {
235      p[1] = p[2] = p[3] = 0.0F;
236   }
237   else {
238      p[1] = (GLfloat) params[1];
239      p[2] = (GLfloat) params[2];
240      p[3] = (GLfloat) params[3];
241   }
242   _mesa_TexGenfv( coord, pname, p );
243}
244
245
246void GLAPIENTRY
247_mesa_TexGenf( GLenum coord, GLenum pname, GLfloat param )
248{
249   GLfloat p[4];
250   p[0] = param;
251   p[1] = p[2] = p[3] = 0.0F;
252   _mesa_TexGenfv(coord, pname, p);
253}
254
255
256void GLAPIENTRY
257_mesa_TexGeni( GLenum coord, GLenum pname, GLint param )
258{
259   GLint p[4];
260   p[0] = param;
261   p[1] = p[2] = p[3] = 0;
262   _mesa_TexGeniv( coord, pname, p );
263}
264
265
266
267static void GLAPIENTRY
268_mesa_GetTexGendv( GLenum coord, GLenum pname, GLdouble *params )
269{
270   struct gl_texture_unit *texUnit;
271   struct gl_texgen *texgen;
272   GET_CURRENT_CONTEXT(ctx);
273   ASSERT_OUTSIDE_BEGIN_END(ctx);
274
275   if (ctx->Texture.CurrentUnit >= ctx->Const.MaxTextureCoordUnits) {
276      _mesa_error(ctx, GL_INVALID_OPERATION, "glGetTexGendv(current unit)");
277      return;
278   }
279
280   texUnit = _mesa_get_current_tex_unit(ctx);
281
282   texgen = get_texgen(texUnit, coord);
283   if (!texgen) {
284      _mesa_error(ctx, GL_INVALID_ENUM, "glGetTexGendv(coord)");
285      return;
286   }
287
288   switch (pname) {
289   case GL_TEXTURE_GEN_MODE:
290      params[0] = ENUM_TO_DOUBLE(texgen->Mode);
291      break;
292   case GL_OBJECT_PLANE:
293      COPY_4V(params, texgen->ObjectPlane);
294      break;
295   case GL_EYE_PLANE:
296      COPY_4V(params, texgen->EyePlane);
297      break;
298   default:
299      _mesa_error( ctx, GL_INVALID_ENUM, "glGetTexGendv(pname)" );
300   }
301}
302
303
304
305void GLAPIENTRY
306_mesa_GetTexGenfv( GLenum coord, GLenum pname, GLfloat *params )
307{
308   struct gl_texture_unit *texUnit;
309   struct gl_texgen *texgen;
310   GET_CURRENT_CONTEXT(ctx);
311   ASSERT_OUTSIDE_BEGIN_END(ctx);
312
313   if (ctx->Texture.CurrentUnit >= ctx->Const.MaxTextureCoordUnits) {
314      _mesa_error(ctx, GL_INVALID_OPERATION, "glGetTexGenfv(current unit)");
315      return;
316   }
317
318   texUnit = _mesa_get_current_tex_unit(ctx);
319
320   texgen = get_texgen(texUnit, coord);
321   if (!texgen) {
322      _mesa_error(ctx, GL_INVALID_ENUM, "glGetTexGenfv(coord)");
323      return;
324   }
325
326   switch (pname) {
327   case GL_TEXTURE_GEN_MODE:
328      params[0] = ENUM_TO_FLOAT(texgen->Mode);
329      break;
330   case GL_OBJECT_PLANE:
331      COPY_4V(params, texgen->ObjectPlane);
332      break;
333   case GL_EYE_PLANE:
334      COPY_4V(params, texgen->EyePlane);
335      break;
336   default:
337      _mesa_error( ctx, GL_INVALID_ENUM, "glGetTexGenfv(pname)" );
338   }
339}
340
341
342
343static void GLAPIENTRY
344_mesa_GetTexGeniv( GLenum coord, GLenum pname, GLint *params )
345{
346   struct gl_texture_unit *texUnit;
347   struct gl_texgen *texgen;
348   GET_CURRENT_CONTEXT(ctx);
349   ASSERT_OUTSIDE_BEGIN_END(ctx);
350
351   if (ctx->Texture.CurrentUnit >= ctx->Const.MaxTextureCoordUnits) {
352      _mesa_error(ctx, GL_INVALID_OPERATION, "glGetTexGeniv(current unit)");
353      return;
354   }
355
356   texUnit = _mesa_get_current_tex_unit(ctx);
357
358   texgen = get_texgen(texUnit, coord);
359   if (!texgen) {
360      _mesa_error(ctx, GL_INVALID_ENUM, "glGetTexGeniv(coord)");
361      return;
362   }
363
364   switch (pname) {
365   case GL_TEXTURE_GEN_MODE:
366      params[0] = texgen->Mode;
367      break;
368   case GL_OBJECT_PLANE:
369      params[0] = (GLint) texgen->ObjectPlane[0];
370      params[1] = (GLint) texgen->ObjectPlane[1];
371      params[2] = (GLint) texgen->ObjectPlane[2];
372      params[3] = (GLint) texgen->ObjectPlane[3];
373      break;
374   case GL_EYE_PLANE:
375      params[0] = (GLint) texgen->EyePlane[0];
376      params[1] = (GLint) texgen->EyePlane[1];
377      params[2] = (GLint) texgen->EyePlane[2];
378      params[3] = (GLint) texgen->EyePlane[3];
379      break;
380   default:
381      _mesa_error( ctx, GL_INVALID_ENUM, "glGetTexGeniv(pname)" );
382   }
383}
384
385
386void
387_mesa_init_texgen_dispatch(struct _glapi_table *disp)
388{
389   SET_GetTexGendv(disp, _mesa_GetTexGendv);
390   SET_GetTexGenfv(disp, _mesa_GetTexGenfv);
391   SET_GetTexGeniv(disp, _mesa_GetTexGeniv);
392   SET_TexGend(disp, _mesa_TexGend);
393   SET_TexGendv(disp, _mesa_TexGendv);
394   SET_TexGenf(disp, _mesa_TexGenf);
395   SET_TexGenfv(disp, _mesa_TexGenfv);
396   SET_TexGeni(disp, _mesa_TexGeni);
397   SET_TexGeniv(disp, _mesa_TexGeniv);
398}
399
400
401#endif /* FEATURE_texgen */
402