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/* gears.c */
/*
* 3-D gear wheels. This program is in the public domain.
*
* Brian Paul
* modified by Uwe Maurer (uwe_maurer@t-online.de)
*/
#include <string.h>
#include <math.h>
#include <stdlib.h>
#include <ggi/ggi.h>
#include <GL/ggimesa.h>
#ifndef M_PI
# define M_PI 3.14159265
#endif
ggi_visual_t vis;
char text[100];
int db_flag,vis_x, vis_y, vir_x, vir_y, gt;
/*
* Draw a gear wheel. You'll probably want to call this function when
* building a display list since we do a lot of trig here.
*
* Input: inner_radius - radius of hole at center
* outer_radius - radius at center of teeth
* width - width of gear
* teeth - number of teeth
* tooth_depth - depth of tooth
*/
static void gear( GLfloat inner_radius, GLfloat outer_radius, GLfloat width,
GLint teeth, GLfloat tooth_depth )
{
GLint i;
GLfloat r0, r1, r2;
GLfloat angle, da;
GLfloat u, v, len;
r0 = inner_radius;
r1 = outer_radius - tooth_depth/2.0;
r2 = outer_radius + tooth_depth/2.0;
da = 2.0*M_PI / teeth / 4.0;
glShadeModel( GL_FLAT );
glNormal3f( 0.0, 0.0, 1.0 );
/* draw front face */
glBegin( GL_QUAD_STRIP );
for (i=0;i<=teeth;i++) {
angle = i * 2.0*M_PI / teeth;
glVertex3f( r0*cos(angle), r0*sin(angle), width*0.5 );
glVertex3f( r1*cos(angle), r1*sin(angle), width*0.5 );
glVertex3f( r0*cos(angle), r0*sin(angle), width*0.5 );
glVertex3f( r1*cos(angle+3*da), r1*sin(angle+3*da), width*0.5 );
}
glEnd();
/* draw front sides of teeth */
glBegin( GL_QUADS );
da = 2.0*M_PI / teeth / 4.0;
for (i=0;i<teeth;i++) {
angle = i * 2.0*M_PI / teeth;
glVertex3f( r1*cos(angle), r1*sin(angle), width*0.5 );
glVertex3f( r2*cos(angle+da), r2*sin(angle+da), width*0.5 );
glVertex3f( r2*cos(angle+2*da), r2*sin(angle+2*da), width*0.5 );
glVertex3f( r1*cos(angle+3*da), r1*sin(angle+3*da), width*0.5 );
}
glEnd();
glNormal3f( 0.0, 0.0, -1.0 );
/* draw back face */
glBegin( GL_QUAD_STRIP );
for (i=0;i<=teeth;i++) {
angle = i * 2.0*M_PI / teeth;
glVertex3f( r1*cos(angle), r1*sin(angle), -width*0.5 );
glVertex3f( r0*cos(angle), r0*sin(angle), -width*0.5 );
glVertex3f( r1*cos(angle+3*da), r1*sin(angle+3*da), -width*0.5 );
glVertex3f( r0*cos(angle), r0*sin(angle), -width*0.5 );
}
glEnd();
/* draw back sides of teeth */
glBegin( GL_QUADS );
da = 2.0*M_PI / teeth / 4.0;
for (i=0;i<teeth;i++) {
angle = i * 2.0*M_PI / teeth;
glVertex3f( r1*cos(angle+3*da), r1*sin(angle+3*da), -width*0.5 );
glVertex3f( r2*cos(angle+2*da), r2*sin(angle+2*da), -width*0.5 );
glVertex3f( r2*cos(angle+da), r2*sin(angle+da), -width*0.5 );
glVertex3f( r1*cos(angle), r1*sin(angle), -width*0.5 );
}
glEnd();
/* draw outward faces of teeth */
glBegin( GL_QUAD_STRIP );
for (i=0;i<teeth;i++) {
angle = i * 2.0*M_PI / teeth;
glVertex3f( r1*cos(angle), r1*sin(angle), width*0.5 );
glVertex3f( r1*cos(angle), r1*sin(angle), -width*0.5 );
u = r2*cos(angle+da) - r1*cos(angle);
v = r2*sin(angle+da) - r1*sin(angle);
len = sqrt( u*u + v*v );
u /= len;
v /= len;
glNormal3f( v, -u, 0.0 );
glVertex3f( r2*cos(angle+da), r2*sin(angle+da), width*0.5 );
glVertex3f( r2*cos(angle+da), r2*sin(angle+da), -width*0.5 );
glNormal3f( cos(angle), sin(angle), 0.0 );
glVertex3f( r2*cos(angle+2*da), r2*sin(angle+2*da), width*0.5 );
glVertex3f( r2*cos(angle+2*da), r2*sin(angle+2*da), -width*0.5 );
u = r1*cos(angle+3*da) - r2*cos(angle+2*da);
v = r1*sin(angle+3*da) - r2*sin(angle+2*da);
glNormal3f( v, -u, 0.0 );
glVertex3f( r1*cos(angle+3*da), r1*sin(angle+3*da), width*0.5 );
glVertex3f( r1*cos(angle+3*da), r1*sin(angle+3*da), -width*0.5 );
glNormal3f( cos(angle), sin(angle), 0.0 );
}
glVertex3f( r1*cos(0), r1*sin(0), width*0.5 );
glVertex3f( r1*cos(0), r1*sin(0), -width*0.5 );
glEnd();
glShadeModel( GL_SMOOTH );
/* draw inside radius cylinder */
glBegin( GL_QUAD_STRIP );
for (i=0;i<=teeth;i++) {
angle = i * 2.0*M_PI / teeth;
glNormal3f( -cos(angle), -sin(angle), 0.0 );
glVertex3f( r0*cos(angle), r0*sin(angle), -width*0.5 );
glVertex3f( r0*cos(angle), r0*sin(angle), width*0.5 );
}
glEnd();
}
static GLfloat view_rotx=20.0, view_roty=30.0, view_rotz=0.0;
static GLint gear1, gear2, gear3;
static GLfloat angle = 0.0;
static GLuint limit;
static GLuint count = 1;
static void draw( void )
{
static int n = 0;
glClearColor(0,0,0,0);
glClearIndex(0);
glClear( GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT );
glPushMatrix();
glRotatef( view_rotx, 1.0, 0.0, 0.0 );
glRotatef( view_roty, 0.0, 1.0, 0.0 );
glRotatef( view_rotz, 0.0, 0.0, 1.0 );
glPushMatrix();
glTranslatef( -3.0, -2.0, 0.0 );
glRotatef( angle, 0.0, 0.0, 1.0 );
glCallList(gear1);
glPopMatrix();
glPushMatrix();
glTranslatef( 3.1, -2.0, 0.0 );
glRotatef( -2.0*angle-9.0, 0.0, 0.0, 1.0 );
glCallList(gear2);
glPopMatrix();
glPushMatrix();
glTranslatef( -3.1, 4.2, 0.0 );
glRotatef( -2.0*angle-25.0, 0.0, 0.0, 1.0 );
glCallList(gear3);
glPopMatrix();
glPopMatrix();
glFlush();
glFinish();
#if 0
ggiSetGCForeground(vis,255);
ggiPuts(vis,0,0,"Mesa -> GGI");
ggiPuts(vis,0,ggiGetInfo(vis)->mode->visible.y," Mesa -> GGI");
ggiPuts(vis,0,16,text);
ggiPuts(vis,0,ggiGetInfo(vis)->mode->visible.y+16,text);
#endif
if(db_flag)
ggiMesaSwapBuffers();
count++;
if (count==limit) {
exit(1);
}
++n;
/*
if (!(n%10)){
ggi_color rgb = { 10000, 10000, 10000 };
ggiSetSimpleMode(vis,vis_x+(n/10),vis_y+(n/10),db_flag?2:1, gt);
glViewport(0, 0,vis_x+(n/10),vis_y+(n/10));
ggiSetGCForeground(vis, ggiMapColor(vis, &rgb));
ggiDrawBox(vis, 20, 20, 100, 100);
if(db_flag)
ggiSetWriteFrame(vis, 1);
}
*/
}
static void idle( void )
{
angle += 2.0;
draw();
}
/* new window size or exposure */
static void reshape( int width, int height )
{
GLfloat h = (GLfloat) height / (GLfloat) width;
if(db_flag)
glDrawBuffer(GL_BACK);
else
glDrawBuffer(GL_FRONT);
glViewport(0, 0, (GLint)width, (GLint)height);
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
glFrustum( -1.0, 1.0, -h, h, 5.0, 60.0 );
glMatrixMode(GL_MODELVIEW);
glLoadIdentity();
glTranslatef( 0.0, 0.0, -40.0 );
glClear( GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT );
}
static void init( void )
{
static GLfloat pos[4] = {5.0, 5.0, 10.0, 0.0 };
static GLfloat red[4] = {0.9, 0.9, 0.9, 1.0 };
static GLfloat green[4] = {0.0, 0.8, 0.9, 1.0 };
static GLfloat blue[4] = {0.2, 0.2, 1.0, 1.0 };
glLightfv( GL_LIGHT0, GL_POSITION, pos );
glEnable( GL_CULL_FACE );
glEnable( GL_LIGHTING );
glEnable( GL_LIGHT0 );
glEnable( GL_DEPTH_TEST );
/* make the gears */
gear1 = glGenLists(1);
glNewList(gear1, GL_COMPILE);
glMaterialfv( GL_FRONT, GL_AMBIENT_AND_DIFFUSE, red );
glIndexi(1);
gear( 1.0, 4.0, 1.0, 20, 0.7 );
glEndList();
gear2 = glGenLists(1);
glNewList(gear2, GL_COMPILE);
glMaterialfv( GL_FRONT, GL_AMBIENT_AND_DIFFUSE, green );
glIndexi(2);
gear( 0.5, 2.0, 2.0, 10, 0.7 );
glEndList();
gear3 = glGenLists(1);
glNewList(gear3, GL_COMPILE);
glMaterialfv( GL_FRONT, GL_AMBIENT_AND_DIFFUSE, blue );
glIndexi(3);
gear( 1.3, 2.0, 0.5, 10, 0.7 );
glEndList();
glEnable( GL_NORMALIZE );
}
static void usage(char *s)
{
printf("%s visible_x visible_y virtual_x virtual_y bpp db_flag\n",s);
printf("example:\n");
printf("%s 320 200 320 400 8 1\n",s);
exit(1);
}
int main( int argc, char *argv[] )
{
ggi_mesa_context_t ctx;
ggi_mode mode;
int bpp;
limit=0;
if (argc<7) usage(argv[0]);
vis_x=atoi(argv[1]);
vis_y=atoi(argv[2]);
vir_x=atoi(argv[3]);
vir_y=atoi(argv[4]);
bpp=atoi(argv[5]);
db_flag=atoi(argv[6]);
switch(bpp)
{
case 4: gt=GT_4BIT;break;
case 8: gt=GT_8BIT;break;
case 15:gt=GT_15BIT;break;
case 16:gt=GT_16BIT;break;
case 24:gt=GT_24BIT;break;
case 32:gt=GT_32BIT;break;
default:
printf("%i Bits per Pixel ???\n",bpp);
exit(1);
}
sprintf(text,"%sx%s %i colors, RGB mode, %s",
argv[1],argv[2],1<<bpp,
(db_flag) ? "doublebuffer" : "no doublebuffer");
if (ggiInit()<0)
{
printf("ggiInit() failed\n");
exit(1);
}
if (ggiMesaInit() < 0)
{
printf("ggiMesaInit failed\n");
exit(1);
}
vis=ggiOpen(NULL);
if (vis==NULL)
{
printf("ggiOpen() failed\n");
exit(1);
}
if (ggiSetSimpleMode(vis,vis_x,vis_y,db_flag ? 2 : 1,gt)<0)
{
printf("%s: can't set graphmode (%i %i %i %i) %i BPP\n",
argv[0],vis_x,vis_y,vir_x,vir_y,bpp);
exit(1);
}
if (ggiMesaAttach(vis) < 0)
{
printf("ggiMesaAttach failed\n");
exit(1);
}
if (ggiMesaExtendVisual(vis, GL_FALSE, GL_FALSE, 16,
0, 0, 0, 0, 0, 1) < 0)
{
printf ("GGIMesaSetVisual() failed\n");
exit(1);
}
ctx = ggiMesaCreateContext(vis);
if (ctx==NULL)
{
printf("GGIMesaCreateContext() failed\n");
exit(1);
}
ggiMesaMakeCurrent(ctx, vis);
ggiGetMode(vis,&mode);
reshape(mode.visible.x,mode.visible.y);
init();
while (!ggiKbhit(vis)) { /*sleep(1);*/ idle(); }
ggiMesaDestroyContext(ctx);
ggiClose(vis);
printf("%s\n",text);
ggiExit();
return 0;
}
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