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timer func now changes two colors alternatingly, using multiple active

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timers


git-svn-id: https://svn.code.sf.net/p/freeglut/code/trunk@1482 7f0cb862-5218-0410-a997-914c9d46530a
This commit is contained in:
dcnieho 2012-11-23 08:40:13 +00:00
parent 95b2935ce9
commit 9d51152ba6
1 changed files with 22 additions and 5 deletions
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25
freeglut/freeglut/progs/demos/timer/timer.c
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@ -12,7 +12,8 @@ void disp(void);
void timer_func(int unused);
/* color index will be advanced every time the timer expires */
int cidx;
int cidx = 0;
int pcidx = 2;
float color[][3] = {
{1, 0, 0},
{0, 1, 0},
@ -32,7 +33,8 @@ int main(int argc, char **argv)
glutDisplayFunc(disp);
/* get timer started, its reset in the timer function itself */
glutTimerFunc(1000, timer_func, 0);
glutTimerFunc(1000, timer_func, 1);
glutTimerFunc(500, timer_func, 2);
glutMainLoop();
return 0;
@ -43,15 +45,30 @@ void disp(void)
glClearColor(color[cidx][0], color[cidx][1], color[cidx][2], 1);
glClear(GL_COLOR_BUFFER_BIT);
glPointSize(10.f);
glColor3f(color[pcidx][0], color[pcidx][1], color[pcidx][2]);
glBegin(GL_POINTS);
glVertex2i(0,0);
glEnd();
glutSwapBuffers();
}
void timer_func(int unused)
void timer_func(int which)
{
/* advance the color index and trigger a redisplay */
switch (which)
{
case 1:
cidx = (cidx + 1) % (sizeof color / sizeof *color);
break;
case 2:
pcidx = (pcidx + 1) % (sizeof color / sizeof *color);
break;
}
glutPostRedisplay();
/* (re)set the timer callback and ask glut to call it in 1 second */
glutTimerFunc(1000, timer_func, 0);
glutTimerFunc(1000, timer_func, which);
}