texgen.c revision cc95de82e5939586771d478e662cb458bbc42c20 
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/texgen.h"
38#include "main/texstate.h"
39#include "math/m_matrix.h"
40#include "glapi/dispatch.h"
41
42
43#if FEATURE_texgen
44
45
46/**
47 * Return texgen state for given coordinate
48 */
49static struct gl_texgen *
50get_texgen(struct gl_texture_unit *texUnit, GLenum coord)
51{
52   switch (coord) {
53   case GL_S:
54      return &texUnit->GenS;
55   case GL_T:
56      return &texUnit->GenT;
57   case GL_R:
58      return &texUnit->GenR;
59   case GL_Q:
60      return &texUnit->GenQ;
61   default:
62      return NULL;
63   }
64}
65
66
67void GLAPIENTRY
68_mesa_TexGenfv( GLenum coord, GLenum pname, const GLfloat *params )
69{
70   struct gl_texture_unit *texUnit;
71   struct gl_texgen *texgen;
72   GET_CURRENT_CONTEXT(ctx);
73   ASSERT_OUTSIDE_BEGIN_END(ctx);
74
75   if (MESA_VERBOSE&(VERBOSE_API|VERBOSE_TEXTURE))
76      _mesa_debug(ctx, "glTexGen %s %s %.1f(%s)...\n",
77                  _mesa_lookup_enum_by_nr(coord),
78                  _mesa_lookup_enum_by_nr(pname),
79                  *params,
80		  _mesa_lookup_enum_by_nr((GLenum) (GLint) *params));
81
82   if (ctx->Texture.CurrentUnit >= ctx->Const.MaxTextureCoordUnits) {
83      _mesa_error(ctx, GL_INVALID_OPERATION, "glTexGen(current unit)");
84      return;
85   }
86
87   texUnit = _mesa_get_current_tex_unit(ctx);
88
89   texgen = get_texgen(texUnit, coord);
90   if (!texgen) {
91      _mesa_error(ctx, GL_INVALID_ENUM, "glTexGen(coord)");
92      return;
93   }
94
95   switch (pname) {
96   case GL_TEXTURE_GEN_MODE:
97      {
98         GLenum mode = (GLenum) (GLint) params[0];
99         GLbitfield bit = 0x0;
100         if (texgen->Mode == mode)
101            return;
102         switch (mode) {
103         case GL_OBJECT_LINEAR:
104            bit = TEXGEN_OBJ_LINEAR;
105            break;
106         case GL_EYE_LINEAR:
107            bit = TEXGEN_EYE_LINEAR;
108            break;
109         case GL_SPHERE_MAP:
110            if (coord == GL_S || coord == GL_T)
111               bit = TEXGEN_SPHERE_MAP;
112            break;
113         case GL_REFLECTION_MAP_NV:
114            if (coord != GL_Q)
115               bit = TEXGEN_REFLECTION_MAP_NV;
116            break;
117         case GL_NORMAL_MAP_NV:
118            if (coord != GL_Q)
119               bit = TEXGEN_NORMAL_MAP_NV;
120            break;
121         default:
122            ; /* nop */
123         }
124         if (!bit) {
125            _mesa_error( ctx, GL_INVALID_ENUM, "glTexGenfv(param)" );
126            return;
127         }
128         FLUSH_VERTICES(ctx, _NEW_TEXTURE);
129         texgen->Mode = mode;
130         texgen->_ModeBit = bit;
131      }
132      break;
133
134   case GL_OBJECT_PLANE:
135      {
136         if (TEST_EQ_4V(texgen->ObjectPlane, params))
137            return;
138         FLUSH_VERTICES(ctx, _NEW_TEXTURE);
139         COPY_4FV(texgen->ObjectPlane, params);
140      }
141      break;
142
143   case GL_EYE_PLANE:
144      {
145         GLfloat tmp[4];
146         /* Transform plane equation by the inverse modelview matrix */
147         if (_math_matrix_is_dirty(ctx->ModelviewMatrixStack.Top)) {
148            _math_matrix_analyse(ctx->ModelviewMatrixStack.Top);
149         }
150         _mesa_transform_vector(tmp, params,
151                                ctx->ModelviewMatrixStack.Top->inv);
152         if (TEST_EQ_4V(texgen->EyePlane, tmp))
153            return;
154         FLUSH_VERTICES(ctx, _NEW_TEXTURE);
155         COPY_4FV(texgen->EyePlane, tmp);
156      }
157      break;
158
159   default:
160      _mesa_error( ctx, GL_INVALID_ENUM, "glTexGenfv(pname)" );
161      return;
162   }
163
164   if (ctx->Driver.TexGen)
165      ctx->Driver.TexGen( ctx, coord, pname, params );
166}
167
168
169static void GLAPIENTRY
170_mesa_TexGeniv(GLenum coord, GLenum pname, const GLint *params )
171{
172   GLfloat p[4];
173   p[0] = (GLfloat) params[0];
174   if (pname == GL_TEXTURE_GEN_MODE) {
175      p[1] = p[2] = p[3] = 0.0F;
176   }
177   else {
178      p[1] = (GLfloat) params[1];
179      p[2] = (GLfloat) params[2];
180      p[3] = (GLfloat) params[3];
181   }
182   _mesa_TexGenfv(coord, pname, p);
183}
184
185
186static void GLAPIENTRY
187_mesa_TexGend(GLenum coord, GLenum pname, GLdouble param )
188{
189   GLfloat p = (GLfloat) param;
190   _mesa_TexGenfv( coord, pname, &p );
191}
192
193
194static void GLAPIENTRY
195_mesa_TexGendv(GLenum coord, GLenum pname, const GLdouble *params )
196{
197   GLfloat p[4];
198   p[0] = (GLfloat) params[0];
199   if (pname == GL_TEXTURE_GEN_MODE) {
200      p[1] = p[2] = p[3] = 0.0F;
201   }
202   else {
203      p[1] = (GLfloat) params[1];
204      p[2] = (GLfloat) params[2];
205      p[3] = (GLfloat) params[3];
206   }
207   _mesa_TexGenfv( coord, pname, p );
208}
209
210
211static void GLAPIENTRY
212_mesa_TexGenf( GLenum coord, GLenum pname, GLfloat param )
213{
214   _mesa_TexGenfv(coord, pname, &param);
215}
216
217
218void GLAPIENTRY
219_mesa_TexGeni( GLenum coord, GLenum pname, GLint param )
220{
221   _mesa_TexGeniv( coord, pname, &param );
222}
223
224
225
226static void GLAPIENTRY
227_mesa_GetTexGendv( GLenum coord, GLenum pname, GLdouble *params )
228{
229   struct gl_texture_unit *texUnit;
230   struct gl_texgen *texgen;
231   GET_CURRENT_CONTEXT(ctx);
232   ASSERT_OUTSIDE_BEGIN_END(ctx);
233
234   if (ctx->Texture.CurrentUnit >= ctx->Const.MaxTextureCoordUnits) {
235      _mesa_error(ctx, GL_INVALID_OPERATION, "glGetTexGendv(current unit)");
236      return;
237   }
238
239   texUnit = _mesa_get_current_tex_unit(ctx);
240
241   texgen = get_texgen(texUnit, coord);
242   if (!texgen) {
243      _mesa_error(ctx, GL_INVALID_ENUM, "glGetTexGendv(coord)");
244      return;
245   }
246
247   switch (pname) {
248   case GL_TEXTURE_GEN_MODE:
249      params[0] = ENUM_TO_DOUBLE(texgen->Mode);
250      break;
251   case GL_OBJECT_PLANE:
252      COPY_4V(params, texgen->ObjectPlane);
253      break;
254   case GL_EYE_PLANE:
255      COPY_4V(params, texgen->EyePlane);
256      break;
257   default:
258      _mesa_error( ctx, GL_INVALID_ENUM, "glGetTexGendv(pname)" );
259   }
260}
261
262
263
264static void GLAPIENTRY
265_mesa_GetTexGenfv( GLenum coord, GLenum pname, GLfloat *params )
266{
267   struct gl_texture_unit *texUnit;
268   struct gl_texgen *texgen;
269   GET_CURRENT_CONTEXT(ctx);
270   ASSERT_OUTSIDE_BEGIN_END(ctx);
271
272   if (ctx->Texture.CurrentUnit >= ctx->Const.MaxTextureCoordUnits) {
273      _mesa_error(ctx, GL_INVALID_OPERATION, "glGetTexGenfv(current unit)");
274      return;
275   }
276
277   texUnit = _mesa_get_current_tex_unit(ctx);
278
279   texgen = get_texgen(texUnit, coord);
280   if (!texgen) {
281      _mesa_error(ctx, GL_INVALID_ENUM, "glGetTexGenfv(coord)");
282      return;
283   }
284
285   switch (pname) {
286   case GL_TEXTURE_GEN_MODE:
287      params[0] = ENUM_TO_FLOAT(texgen->Mode);
288      break;
289   case GL_OBJECT_PLANE:
290      COPY_4V(params, texgen->ObjectPlane);
291      break;
292   case GL_EYE_PLANE:
293      COPY_4V(params, texgen->EyePlane);
294      break;
295   default:
296      _mesa_error( ctx, GL_INVALID_ENUM, "glGetTexGenfv(pname)" );
297   }
298}
299
300
301
302static void GLAPIENTRY
303_mesa_GetTexGeniv( GLenum coord, GLenum pname, GLint *params )
304{
305   struct gl_texture_unit *texUnit;
306   struct gl_texgen *texgen;
307   GET_CURRENT_CONTEXT(ctx);
308   ASSERT_OUTSIDE_BEGIN_END(ctx);
309
310   if (ctx->Texture.CurrentUnit >= ctx->Const.MaxTextureCoordUnits) {
311      _mesa_error(ctx, GL_INVALID_OPERATION, "glGetTexGeniv(current unit)");
312      return;
313   }
314
315   texUnit = _mesa_get_current_tex_unit(ctx);
316
317   texgen = get_texgen(texUnit, coord);
318   if (!texgen) {
319      _mesa_error(ctx, GL_INVALID_ENUM, "glGetTexGeniv(coord)");
320      return;
321   }
322
323   switch (pname) {
324   case GL_TEXTURE_GEN_MODE:
325      params[0] = texgen->Mode;
326      break;
327   case GL_OBJECT_PLANE:
328      params[0] = (GLint) texgen->ObjectPlane[0];
329      params[1] = (GLint) texgen->ObjectPlane[1];
330      params[2] = (GLint) texgen->ObjectPlane[2];
331      params[3] = (GLint) texgen->ObjectPlane[3];
332      break;
333   case GL_EYE_PLANE:
334      params[0] = (GLint) texgen->EyePlane[0];
335      params[1] = (GLint) texgen->EyePlane[1];
336      params[2] = (GLint) texgen->EyePlane[2];
337      params[3] = (GLint) texgen->EyePlane[3];
338      break;
339   default:
340      _mesa_error( ctx, GL_INVALID_ENUM, "glGetTexGeniv(pname)" );
341   }
342}
343
344
345void
346_mesa_init_texgen_dispatch(struct _glapi_table *disp)
347{
348   SET_GetTexGendv(disp, _mesa_GetTexGendv);
349   SET_GetTexGenfv(disp, _mesa_GetTexGenfv);
350   SET_GetTexGeniv(disp, _mesa_GetTexGeniv);
351   SET_TexGend(disp, _mesa_TexGend);
352   SET_TexGendv(disp, _mesa_TexGendv);
353   SET_TexGenf(disp, _mesa_TexGenf);
354   SET_TexGenfv(disp, _mesa_TexGenfv);
355   SET_TexGeni(disp, _mesa_TexGeni);
356   SET_TexGeniv(disp, _mesa_TexGeniv);
357}
358
359
360#endif /* FEATURE_texgen */
361