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