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OS/2 Shareware BBS: 10 Tools
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newopg.zip
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DOUBLE.C
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1995-03-04
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/*
* double.c
* This program demonstrates double buffering for
* flicker-free animation. The left and middle mouse
* buttons start and stop the spinning motion of the square.
*/
#include <GL/gl.h>
#include <GL/glu.h>
#include "aux.h"
static GLfloat spin = 0.0;
void display(void)
{
glClear (GL_COLOR_BUFFER_BIT);
glPushMatrix ();
glRotatef (spin, 0.0, 0.0, 1.0);
glRectf (-25.0, -25.0, 25.0, 25.0);
glPopMatrix ();
auxSwapBuffers();
}
void spinDisplay (void)
{
spin = spin + 2.0;
if (spin > 360.0)
spin = spin - 360.0;
display();
/* glFinish(); */
}
void startIdleFunc (AUX_EVENTREC *event)
{
auxIdleFunc(spinDisplay);
}
void stopIdleFunc (AUX_EVENTREC *event)
{
auxIdleFunc(0);
}
void myinit (void)
{
glClearColor (0.0, 0.0, 0.0, 1.0);
glColor3f (1.0, 1.0, 1.0);
glShadeModel (GL_FLAT);
}
void myReshape(GLint w, GLint h)
{
glViewport(0, 0, w, h);
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
if (w <= h)
glOrtho (-50.0, 50.0, -50.0*(GLfloat)h/(GLfloat)w,
50.0*(GLfloat)h/(GLfloat)w, -1.0, 1.0);
else
glOrtho (-50.0*(GLfloat)w/(GLfloat)h,
50.0*(GLfloat)w/(GLfloat)h, -50.0, 50.0, -1.0, 1.0);
glMatrixMode(GL_MODELVIEW);
glLoadIdentity ();
}
/* Main Loop
* Open window with initial window size, title bar,
* RGBA display mode, and handle input events.
*/
int main(int argc, char** argv)
{
auxInitDisplayMode (AUX_DOUBLE | AUX_RGB);
auxInitPosition (0, 0, 500, 500);
auxInitWindow (argv[0]);
myinit ();
auxReshapeFunc (myReshape);
auxIdleFunc (spinDisplay);
auxMouseFunc (AUX_LEFTBUTTON, AUX_MOUSEDOWN, startIdleFunc);
auxMouseFunc (AUX_MIDDLEBUTTON, AUX_MOUSEDOWN, stopIdleFunc);
auxMainLoop(display);
}