TNURB.C

/* 
 * (c) Copyright 1993, Silicon Graphics, Inc. 
 *               1993-1995 Microsoft Corporation 
 * 
 * ALL RIGHTS RESERVED 
 * 
 * Please refer to OpenGL/readme.txt for additional information 
 * 
 */ 
 
#include "glos.h" 
 
#include <stdio.h> 
#include <stdlib.h> 
#include <string.h> 
#include <GL/gl.h> 
#include <GL/glu.h> 
#include <math.h> 
#include <gl\glaux.h> 
 
#define INREAL float 
 
#define S_NUMPOINTS 13 
#define S_ORDER     3    
#define S_NUMKNOTS  (S_NUMPOINTS + S_ORDER) 
#define T_NUMPOINTS 3 
#define T_ORDER     3  
#define T_NUMKNOTS  (T_NUMPOINTS + T_ORDER) 
#define SQRT_TWO    1.41421356237309504880 
 
typedef INREAL Point[4]; 
 
static void CALLBACK ErrorCallback(GLenum which); 
static void Init(void ); 
static void CALLBACK Reshape(int width,int height); 
static void CALLBACK Key_DOWN(void ); 
static void CALLBACK Key_UP(void ); 
static void CALLBACK Key_LEFT(void ); 
static void CALLBACK Key_RIGHT(void ); 
static void CALLBACK Draw(void ); 
static GLenum Args(int argc,char **argv ); 
 
GLenum doubleBuffer; 
 
GLenum expectedError; 
GLint rotX = 40, rotY = 40; 
INREAL sknots[S_NUMKNOTS] = { 
    -1.0, -1.0, -1.0, 0.0, 1.0, 2.0, 3.0, 4.0, 
    4.0, 5.0, 6.0, 7.0, 8.0, 9.0, 9.0, 9.0 
}; 
INREAL tknots[T_NUMKNOTS] = { 
    1.0, 1.0, 1.0, 2.0, 2.0, 2.0 
}; 
Point ctlpoints[S_NUMPOINTS][T_NUMPOINTS] = { 
    { 
    { 
        4.0, 2.0, 2.0, 1.0 
    }, 
    { 
        4.0, 1.6, 2.5, 1.0 
    }, 
    { 
        4.0, 2.0, 3.0, 1.0 
    } 
    }, 
    { 
    { 
        5.0, 4.0, 2.0, 1.0 
    }, 
    { 
        5.0, 4.0, 2.5, 1.0 
    }, 
    { 
        5.0, 4.0, 3.0, 1.0 
    } 
    }, 
    { 
    { 
        6.0, 5.0, 2.0, 1.0 
    }, 
    { 
        6.0, 5.0, 2.5, 1.0 
    }, 
    { 
        6.0, 5.0, 3.0, 1.0 
    } 
    }, 
    { 
    { 
        SQRT_TWO*6.0, SQRT_TWO*6.0, SQRT_TWO*2.0, SQRT_TWO 
    }, 
    { 
        SQRT_TWO*6.0, SQRT_TWO*6.0, SQRT_TWO*2.5, SQRT_TWO 
    }, 
    { 
        SQRT_TWO*6.0, SQRT_TWO*6.0, SQRT_TWO*3.0, SQRT_TWO 
    }   
    }, 
    { 
    { 
        5.2, 6.7, 2.0, 1.0 
    }, 
    { 
        5.2, 6.7, 2.5, 1.0 
    }, 
    { 
        5.2, 6.7, 3.0, 1.0 
    } 
    }, 
    { 
    { 
        SQRT_TWO*4.0, SQRT_TWO*6.0, SQRT_TWO*2.0, SQRT_TWO 
    }, 
    { 
        SQRT_TWO*4.0, SQRT_TWO*6.0, SQRT_TWO*2.5, SQRT_TWO 
    },  
    { 
        SQRT_TWO*4.0, SQRT_TWO*6.0, SQRT_TWO*3.0, SQRT_TWO 
    }   
    },  
    { 
    { 
        4.0, 5.2, 2.0, 1.0 
    }, 
    { 
        4.0, 4.6, 2.5, 1.0 
    }, 
    { 
        4.0, 5.2, 3.0, 1.0 
    }   
    }, 
    { 
    { 
        SQRT_TWO*4.0, SQRT_TWO*6.0, SQRT_TWO*2.0, SQRT_TWO 
    }, 
    { 
        SQRT_TWO*4.0, SQRT_TWO*6.0, SQRT_TWO*2.5, SQRT_TWO 
    }, 
    { 
        SQRT_TWO*4.0, SQRT_TWO*6.0, SQRT_TWO*3.0, SQRT_TWO 
    }   
    }, 
    { 
    { 
        2.8, 6.7, 2.0, 1.0 
    }, 
    { 
        2.8, 6.7, 2.5, 1.0 
    }, 
    { 
        2.8, 6.7, 3.0, 1.0 
    }    
    }, 
    { 
    { 
        SQRT_TWO*2.0, SQRT_TWO*6.0, SQRT_TWO*2.0, SQRT_TWO 
    }, 
    { 
        SQRT_TWO*2.0, SQRT_TWO*6.0, SQRT_TWO*2.5, SQRT_TWO 
    }, 
    { 
        SQRT_TWO*2.0, SQRT_TWO*6.0, SQRT_TWO*3.0, SQRT_TWO 
    }   
    }, 
    { 
    { 
        2.0, 5.0, 2.0, 1.0 
    }, 
    { 
        2.0, 5.0, 2.5, 1.0 
    }, 
    { 
        2.0, 5.0, 3.0, 1.0 
    }  
    }, 
    { 
    { 
        3.0, 4.0, 2.0, 1.0 
    }, 
    { 
        3.0, 4.0, 2.5, 1.0 
    }, 
    { 
        3.0, 4.0, 3.0, 1.0 
    }  
    }, 
    { 
    { 
        4.0, 2.0, 2.0, 1.0 
    }, 
    { 
        4.0, 1.6, 2.5, 1.0 
    }, 
    { 
        4.0, 2.0, 3.0, 1.0 
    }     
    } 
}; 
GLUnurbsObj *theNurbs; 
 
 
static void CALLBACK ErrorCallback(GLenum which) 
{ 
 
    if (which != expectedError) { 
    fprintf(stderr, "Unexpected error occured (%d):\n", which); 
    fprintf(stderr, "    %s\n", gluErrorString(which)); 
    } 
} 
 
static void Init(void) 
{ 
 
    theNurbs = gluNewNurbsRenderer(); 
    //gluNurbsCallback(theNurbs, GLU_ERROR, ErrorCallback); 
 
    gluNurbsProperty(theNurbs, GLU_SAMPLING_TOLERANCE, 15.0); 
    gluNurbsProperty(theNurbs, GLU_DISPLAY_MODE, GLU_OUTLINE_PATCH); 
 
    expectedError = GLU_INVALID_ENUM; 
    gluNurbsProperty(theNurbs, (GLenum)~0, 15.0); 
    expectedError = GLU_NURBS_ERROR13; 
    gluEndSurface(theNurbs); 
    expectedError = 0; 
 
    glColor3f(1.0, 1.0, 1.0); 
} 
 
static void CALLBACK Reshape(int width, int height) 
{ 
 
    glViewport(0, 0, (GLint)width, (GLint)height); 
 
    glMatrixMode(GL_PROJECTION); 
    glLoadIdentity(); 
    glFrustum(-2.0, 2.0, -2.0, 2.0, 0.8, 10.0); 
    gluLookAt(7.0, 4.5, 4.0, 4.5, 4.5, 2.5, 6.0, -3.0, 2.0); 
    glMatrixMode(GL_MODELVIEW); 
} 
 
static void CALLBACK Key_DOWN(void) 
{ 
    rotX -= 5; 
} 
 
static void CALLBACK Key_UP(void) 
{ 
    rotX += 5; 
} 
 
static void CALLBACK Key_LEFT(void) 
{ 
    rotY -= 5; 
} 
 
static void CALLBACK Key_RIGHT(void) 
{ 
    rotY += 5; 
} 
 
static void CALLBACK Draw(void) 
{ 
 
    glClear(GL_COLOR_BUFFER_BIT); 
 
    glPushMatrix(); 
 
    glTranslatef(4.0, 4.5, 2.5); 
    glRotatef(rotY, 1, 0, 0); 
    glRotatef(rotX, 0, 1, 0); 
    glTranslatef(-4.0, -4.5, -2.5); 
 
    gluBeginSurface(theNurbs); 
    gluNurbsSurface(theNurbs, S_NUMKNOTS, sknots, T_NUMKNOTS, tknots, 
            4*T_NUMPOINTS, 4, &ctlpoints[0][0][0], S_ORDER, 
            T_ORDER, GL_MAP2_VERTEX_4); 
    gluEndSurface(theNurbs); 
 
    glPopMatrix(); 
 
    glFlush(); 
 
    if (doubleBuffer) { 
    auxSwapBuffers(); 
    } 
} 
 
static GLenum Args(int argc, char **argv) 
{ 
    GLint i; 
 
    doubleBuffer = GL_FALSE; 
 
 
    for (i = 1; i < argc; i++) { 
    if (strcmp(argv[i], "-sb") == 0) { 
        doubleBuffer = GL_FALSE; 
    } else if (strcmp(argv[i], "-db") == 0) { 
        doubleBuffer = GL_TRUE; 
    } else { 
        printf("%s (Bad option).\n", argv[i]); 
        return GL_FALSE; 
    } 
    } 
    return GL_TRUE; 
} 
 
void main(int argc, char **argv) 
{ 
    GLenum type; 
 
    if (Args(argc, argv) == GL_FALSE) { 
    auxQuit(); 
    } 
 
    auxInitPosition(0, 0, 300, 300); 
 
    type = AUX_RGB; 
    type |= (doubleBuffer) ? AUX_DOUBLE : AUX_SINGLE; 
 
    auxInitDisplayMode(type); 
 
    if (auxInitWindow("NURBS Test") == GL_FALSE) { 
    auxQuit(); 
    } 
 
    Init(); 
 
    auxExposeFunc((AUXEXPOSEPROC)Reshape); 
    auxReshapeFunc((AUXRESHAPEPROC)Reshape); 
    auxKeyFunc(AUX_DOWN, Key_DOWN); 
    auxKeyFunc(AUX_UP, Key_UP); 
    auxKeyFunc(AUX_LEFT, Key_LEFT); 
    auxKeyFunc(AUX_RIGHT, Key_RIGHT); 
    auxMainLoop(Draw); 
}