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-rw-r--r--progs/ggi/gears2.c359
1 files changed, 359 insertions, 0 deletions
diff --git a/progs/ggi/gears2.c b/progs/ggi/gears2.c
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+++ b/progs/ggi/gears2.c
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+/* gears.c */
+
+/*
+ * 3-D gear wheels. This program is in the public domain.
+ *
+ * Brian Paul
+ * modified by Uwe Maurer ([email protected])
+ */
+
+#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];
+
+/*
+ * 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 )
+{
+ 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
+
+ GGIMesaSwapBuffers();
+
+ count++;
+ if (count==limit) {
+ exit(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;
+
+ 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] = {0.8, 0.1, 0.0, 1.0 };
+ static GLfloat green[4] = {0.0, 0.8, 0.2, 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[] )
+{
+ GGIMesaContext ctx;
+ int vis_x,vis_y,vir_x,vir_y,bpp,db_flag,gt;
+ ggi_mode mode;
+
+ 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);
+ }
+
+ ctx=GGIMesaCreateContext();
+ if (ctx==NULL)
+ {
+ printf("GGIMesaCreateContext() failed\n");
+ exit(1);
+ }
+
+ vis=ggiOpen(NULL);
+ if (vis==NULL)
+ {
+ printf("ggiOpen() failed\n");
+ exit(1);
+ }
+
+ if (ggiSetGraphMode(vis,vis_x,vis_y,vir_x,vir_y,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 (GGIMesaSetVisual(ctx,vis,GL_TRUE,db_flag)<0)
+ {
+ printf ("GGIMesaSetVisual() failed\n");
+ exit(1);
+ }
+
+ GGIMesaMakeCurrent(ctx);
+ ggiGetMode(vis,&mode);
+
+ reshape(mode.visible.x,mode.visible.y);
+
+ init();
+
+ while (!ggiKbhit(vis)) idle();
+
+ GGIMesaDestroyContext(ctx);
+ ggiClose(vis);
+
+ printf("%s\n",text);
+
+ ggiExit();
+ return 0;
+}
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