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