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| #include <stdlib.h> |
| #include <math.h> |
| #include <GL/gl.h> |
| #include "glu.h" |
| |
| |
| void drawTorus(float rc, int numc, float rt, int numt) |
| { |
| int i, j, k; |
| double s, t; |
| double x, y, z; |
| double pi, twopi; |
| |
| pi = 3.14159265358979323846; |
| twopi = 2 * pi; |
| |
| for (i = 0; i < numc; i++) { |
| glBegin(GL_QUAD_STRIP); |
| for (j = 0; j <= numt; j++) { |
| for (k = 1; k >= 0; k--) { |
| s = (i + k) % numc + 0.5; |
| t = j % numt; |
| |
| x = cos(t*twopi/numt) * cos(s*twopi/numc); |
| y = sin(t*twopi/numt) * cos(s*twopi/numc); |
| z = sin(s*twopi/numc); |
| glNormal3f(x, y, z); |
| |
| x = (rt + rc * cos(s*twopi/numc)) * cos(t*twopi/numt); |
| y = (rt + rc * cos(s*twopi/numc)) * sin(t*twopi/numt); |
| z = rc * sin(s*twopi/numc); |
| glVertex3f(x, y, z); |
| } |
| } |
| glEnd(); |
| } |
| } |
| |
| static void normal3f( GLfloat x, GLfloat y, GLfloat z ) |
| { |
| GLdouble mag; |
| |
| mag = sqrt( x*x + y*y + z*z ); |
| if (mag>0.00001F) { |
| x /= mag; |
| y /= mag; |
| z /= mag; |
| } |
| glNormal3f( x, y, z ); |
| } |
| |
| void gluPerspective( GLdouble fovy, GLdouble aspect, |
| GLdouble zNear, GLdouble zFar ) |
| { |
| GLdouble xmin, xmax, ymin, ymax; |
| |
| ymax = zNear * tan( fovy * M_PI / 360.0 ); |
| ymin = -ymax; |
| |
| xmin = ymin * aspect; |
| xmax = ymax * aspect; |
| |
| glFrustum( xmin, xmax, ymin, ymax, zNear, zFar ); |
| } |
| |
| GLUquadricObj *gluNewQuadric(void) |
| { |
| return NULL; |
| } |
| |
| void gluQuadricDrawStyle(GLUquadricObj *obj, int style) |
| { |
| } |
| |
| void gluCylinder( GLUquadricObj *qobj, |
| GLdouble baseRadius, GLdouble topRadius, GLdouble height, |
| GLint slices, GLint stacks ) |
| { |
| GLdouble da, r, dr, dz; |
| GLfloat z, nz, nsign; |
| GLint i, j; |
| GLfloat du = 1.0 / slices; |
| GLfloat dv = 1.0 / stacks; |
| GLfloat tcx = 0.0, tcy = 0.0; |
| |
| nsign = 1.0; |
| |
| da = 2.0*M_PI / slices; |
| dr = (topRadius-baseRadius) / stacks; |
| dz = height / stacks; |
| nz = (baseRadius-topRadius) / height; /* Z component of normal vectors */ |
| |
| for (i=0;i<slices;i++) { |
| GLfloat x1 = -sin(i*da); |
| GLfloat y1 = cos(i*da); |
| GLfloat x2 = -sin((i+1)*da); |
| GLfloat y2 = cos((i+1)*da); |
| z = 0.0; |
| r = baseRadius; |
| tcy = 0.0; |
| glBegin( GL_QUAD_STRIP ); |
| for (j=0;j<=stacks;j++) { |
| if (nsign==1.0) { |
| normal3f( x1*nsign, y1*nsign, nz*nsign ); |
| glTexCoord2f(tcx, tcy); |
| glVertex3f( x1*r, y1*r, z ); |
| normal3f( x2*nsign, y2*nsign, nz*nsign ); |
| glTexCoord2f(tcx+du, tcy); |
| glVertex3f( x2*r, y2*r, z ); |
| } |
| else { |
| normal3f( x2*nsign, y2*nsign, nz*nsign ); |
| glTexCoord2f(tcx, tcy); |
| glVertex3f( x2*r, y2*r, z ); |
| normal3f( x1*nsign, y1*nsign, nz*nsign ); |
| glTexCoord2f(tcx+du, tcy); |
| glVertex3f( x1*r, y1*r, z ); |
| } |
| z += dz; |
| r += dr; |
| tcy += dv; |
| } |
| glEnd(); |
| tcx += du; |
| } |
| } |
| |
| /* Disk (adapted from Mesa) */ |
| |
| void gluDisk( GLUquadricObj *qobj, |
| GLdouble innerRadius, GLdouble outerRadius, |
| GLint slices, GLint loops ) |
| { |
| GLdouble a, da; |
| GLfloat dr; |
| GLfloat r1, r2, dtc; |
| GLint s, l; |
| GLfloat sa,ca; |
| |
| /* Normal vectors */ |
| glNormal3f( 0.0, 0.0, +1.0 ); |
| |
| da = 2.0*M_PI / slices; |
| dr = (outerRadius-innerRadius) / (GLfloat) loops; |
| |
| /* texture of a gluDisk is a cut out of the texture unit square */ |
| /* x, y in [-outerRadius, +outerRadius]; s, t in [0, 1] (linear mapping) */ |
| dtc = 2.0f * outerRadius; |
| |
| r1 = innerRadius; |
| for (l=0;l<loops;l++) { |
| r2 = r1 + dr; |
| glBegin( GL_QUAD_STRIP ); |
| for (s=0;s<=slices;s++) { |
| if (s==slices) a = 0.0; |
| else a = s * da; |
| sa = sin(a); ca = cos(a); |
| glTexCoord2f(0.5+sa*r2/dtc,0.5+ca*r2/dtc); |
| glVertex2f( r2*sa, r2*ca ); |
| glTexCoord2f(0.5+sa*r1/dtc,0.5+ca*r1/dtc); |
| glVertex2f( r1*sa, r1*ca ); |
| } |
| glEnd(); |
| r1 = r2; |
| } |
| |
| } |
| |
| /* |
| * Sphère (adapted from Mesa) |
| */ |
| |
| void gluSphere(GLUquadricObj *qobj, |
| float radius,int slices,int stacks) |
| { |
| float rho, drho, theta, dtheta; |
| float x, y, z; |
| float s, t, ds, dt; |
| int i, j, imin, imax; |
| int normals; |
| float nsign; |
| |
| normals=1; |
| nsign=1; |
| |
| drho = M_PI / (float) stacks; |
| dtheta = 2.0 * M_PI / (float) slices; |
| |
| /* draw +Z end as a triangle fan */ |
| glBegin( GL_TRIANGLE_FAN ); |
| glNormal3f( 0.0, 0.0, 1.0 ); |
| glTexCoord2f(0.5,0.0); |
| glVertex3f( 0.0, 0.0, nsign * radius ); |
| for (j=0;j<=slices;j++) { |
| theta = (j==slices) ? 0.0 : j * dtheta; |
| x = -sin(theta) * sin(drho); |
| y = cos(theta) * sin(drho); |
| z = nsign * cos(drho); |
| if (normals) glNormal3f( x*nsign, y*nsign, z*nsign ); |
| glVertex3f( x*radius, y*radius, z*radius ); |
| } |
| glEnd(); |
| |
| |
| ds = 1.0 / slices; |
| dt = 1.0 / stacks; |
| t = 1.0; /* because loop now runs from 0 */ |
| if (1) { |
| imin = 0; |
| imax = stacks; |
| } |
| else { |
| imin = 1; |
| imax = stacks-1; |
| } |
| |
| /* draw intermediate stacks as quad strips */ |
| for (i=imin;i<imax;i++) { |
| rho = i * drho; |
| glBegin( GL_QUAD_STRIP ); |
| s = 0.0; |
| for (j=0;j<=slices;j++) { |
| theta = (j==slices) ? 0.0 : j * dtheta; |
| x = -sin(theta) * sin(rho); |
| y = cos(theta) * sin(rho); |
| z = nsign * cos(rho); |
| if (normals) glNormal3f( x*nsign, y*nsign, z*nsign ); |
| glTexCoord2f(s,1-t); |
| glVertex3f( x*radius, y*radius, z*radius ); |
| x = -sin(theta) * sin(rho+drho); |
| y = cos(theta) * sin(rho+drho); |
| z = nsign * cos(rho+drho); |
| if (normals) glNormal3f( x*nsign, y*nsign, z*nsign ); |
| glTexCoord2f(s,1-(t-dt)); |
| s += ds; |
| glVertex3f( x*radius, y*radius, z*radius ); |
| } |
| glEnd(); |
| t -= dt; |
| } |
| |
| /* draw -Z end as a triangle fan */ |
| glBegin( GL_TRIANGLE_FAN ); |
| glNormal3f( 0.0, 0.0, -1.0 ); |
| glTexCoord2f(0.5,1.0); |
| glVertex3f( 0.0, 0.0, -radius*nsign ); |
| rho = M_PI - drho; |
| s = 1.0; |
| t = dt; |
| for (j=slices;j>=0;j--) { |
| theta = (j==slices) ? 0.0 : j * dtheta; |
| x = -sin(theta) * sin(rho); |
| y = cos(theta) * sin(rho); |
| z = nsign * cos(rho); |
| if (normals) glNormal3f( x*nsign, y*nsign, z*nsign ); |
| glTexCoord2f(s,1-t); |
| s -= ds; |
| glVertex3f( x*radius, y*radius, z*radius ); |
| } |
| glEnd(); |
| } |