src/mesa/main/texgen.c

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