ReactOS  0.4.15-dev-1397-g19779b3
normal.h File Reference
This graph shows which files directly or indirectly include this file:

Go to the source code of this file.

Functions

void __gl_projectPolygon (GLUtesselator *tess)
 

Function Documentation

◆ __gl_projectPolygon()

void __gl_projectPolygon ( GLUtesselator tess)

Definition at line 198 of file normal.c.

199 {
200  GLUvertex *v, *vHead = &tess->mesh->vHead;
201  GLdouble norm[3];
202  GLdouble *sUnit, *tUnit;
203  int i, computedNormal = FALSE;
204 
205  norm[0] = tess->normal[0];
206  norm[1] = tess->normal[1];
207  norm[2] = tess->normal[2];
208  if( norm[0] == 0 && norm[1] == 0 && norm[2] == 0 ) {
209  ComputeNormal( tess, norm );
210  computedNormal = TRUE;
211  }
212  sUnit = tess->sUnit;
213  tUnit = tess->tUnit;
214  i = LongAxis( norm );
215 
216 #if defined(FOR_TRITE_TEST_PROGRAM) || defined(TRUE_PROJECT)
217  /* Choose the initial sUnit vector to be approximately perpendicular
218  * to the normal.
219  */
220  Normalize( norm );
221 
222  sUnit[i] = 0;
223  sUnit[(i+1)%3] = S_UNIT_X;
224  sUnit[(i+2)%3] = S_UNIT_Y;
225 
226  /* Now make it exactly perpendicular */
227  w = Dot( sUnit, norm );
228  sUnit[0] -= w * norm[0];
229  sUnit[1] -= w * norm[1];
230  sUnit[2] -= w * norm[2];
231  Normalize( sUnit );
232 
233  /* Choose tUnit so that (sUnit,tUnit,norm) form a right-handed frame */
234  tUnit[0] = norm[1]*sUnit[2] - norm[2]*sUnit[1];
235  tUnit[1] = norm[2]*sUnit[0] - norm[0]*sUnit[2];
236  tUnit[2] = norm[0]*sUnit[1] - norm[1]*sUnit[0];
237  Normalize( tUnit );
238 #else
239  /* Project perpendicular to a coordinate axis -- better numerically */
240  sUnit[i] = 0;
241  sUnit[(i+1)%3] = S_UNIT_X;
242  sUnit[(i+2)%3] = S_UNIT_Y;
243 
244  tUnit[i] = 0;
245  tUnit[(i+1)%3] = (norm[i] > 0) ? -S_UNIT_Y : S_UNIT_Y;
246  tUnit[(i+2)%3] = (norm[i] > 0) ? S_UNIT_X : -S_UNIT_X;
247 #endif
248 
249  /* Project the vertices onto the sweep plane */
250  for( v = vHead->next; v != vHead; v = v->next ) {
251  v->s = Dot( v->coords, sUnit );
252  v->t = Dot( v->coords, tUnit );
253  }
254  if( computedNormal ) {
255  CheckOrientation( tess );
256  }
257 }
double GLdouble
Definition: gl.h:163
GLubyte GLubyte GLubyte GLubyte w
Definition: glext.h:6102
#define S_UNIT_Y
Definition: normal.c:191
_Tp _STLP_CALL norm(const complex< _Tp > &__z)
Definition: _complex.h:741
static void CheckOrientation(GLUtesselator *tess)
Definition: normal.c:141
GLdouble tUnit[3]
Definition: tess.h:75
static int LongAxis(GLdouble v[3])
Definition: normal.c:67
GLUvertex vHead
Definition: mesh.h:164
GLdouble normal[3]
Definition: tess.h:73
#define Dot(u, v)
Definition: normal.c:49
GLdouble sUnit[3]
Definition: tess.h:74
#define TRUE
Definition: normal.c:43
GLUmesh * mesh
Definition: tess.h:66
#define FALSE
Definition: normal.c:46
#define S_UNIT_X
Definition: normal.c:190
const GLdouble * v
Definition: gl.h:2040
GLsizei GLenum const GLvoid GLsizei GLenum GLbyte GLbyte GLbyte GLdouble GLdouble GLdouble GLfloat GLfloat GLfloat GLint GLint GLint GLshort GLshort GLshort GLubyte GLubyte GLubyte GLuint GLuint GLuint GLushort GLushort GLushort GLbyte GLbyte GLbyte GLbyte GLdouble GLdouble GLdouble GLdouble GLfloat GLfloat GLfloat GLfloat GLint GLint GLint GLint GLshort GLshort GLshort GLshort GLubyte GLubyte GLubyte GLubyte GLuint GLuint GLuint GLuint GLushort GLushort GLushort GLushort GLboolean const GLdouble const GLfloat const GLint const GLshort const GLbyte const GLdouble const GLfloat const GLint const GLshort const GLdouble const GLfloat const GLint const GLshort const GLdouble const GLfloat const GLint const GLshort const GLdouble const GLfloat const GLint const GLshort const GLdouble const GLdouble const GLfloat const GLfloat const GLint const GLint const GLshort const GLshort const GLdouble const GLfloat const GLint const GLshort const GLdouble const GLfloat const GLint const GLshort const GLdouble const GLfloat const GLint const GLshort const GLdouble const GLfloat const GLint const GLshort const GLdouble const GLfloat const GLint const GLshort const GLdouble const GLfloat const GLint const GLshort const GLdouble const GLfloat const GLint const GLshort GLenum GLenum GLenum GLfloat GLenum GLint GLenum GLenum GLenum GLfloat GLenum GLenum GLint GLenum GLfloat GLenum GLint GLint GLushort GLenum GLenum GLfloat GLenum GLenum GLint GLfloat const GLubyte GLenum GLenum GLenum const GLfloat GLenum GLenum const GLint GLenum GLint GLint GLsizei GLsizei GLint GLenum GLenum const GLvoid GLenum GLenum const GLfloat GLenum GLenum const GLint GLenum GLenum const GLdouble GLenum GLenum const GLfloat GLenum GLenum const GLint GLsizei GLuint GLfloat GLuint GLbitfield GLfloat GLint GLuint GLboolean GLenum GLfloat GLenum GLbitfield GLenum GLfloat GLfloat GLint GLint const GLfloat GLenum GLfloat GLfloat GLint GLint GLfloat GLfloat GLint GLint const GLfloat GLint GLfloat GLfloat GLint GLfloat GLfloat GLint GLfloat GLfloat const GLdouble const GLfloat const GLdouble const GLfloat GLint i
Definition: glfuncs.h:248
GLUvertex * next
Definition: mesh.h:115
static void ComputeNormal(GLUtesselator *tess, GLdouble norm[3])
Definition: normal.c:76

Referenced by gluTessEndPolygon().