eBookReaderSwitch/mupdf/thirdparty/freeglut/progs/demos/timer/timer.c

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/* Timer demo
*
* Written by John Tsiombikas <nuclear@member.fsf.org>
*
* Demonstrate the use of glutTimerFunc, by changing the color of the
* framebuffer every (approximately) 1 sec.
*/
#include <stdio.h>
#include <GL/glut.h>
void disp(void);
void timer_func(int unused);
/* color index will be advanced every time the timer expires */
int cidx = 0;
int pcidx = 2;
float color[][3] = {
{1, 0, 0},
{0, 1, 0},
{0, 0, 1},
{1, 1, 0},
{0, 1, 1},
{1, 0, 1}
};
int timerInts[] = {
250,
500,
1000
};
int timerSurroundInt = 1000, timerCenterInt = 1000;
/* menu IDs, creation/update funcs and callback */
int menuID, subMenuSurround, subMenuCenter;
void createMenuEntries(int which)
{
int i;
for (i = 0; i < sizeof(timerInts) / sizeof(*timerInts); i++)
{
char temp[10] = {'\0'};
/* flag current value */
if ((which == 1 ? timerSurroundInt : timerCenterInt) == timerInts[i])
temp[0] = '+';
else
temp[0] = '-';
sprintf(temp + 1, " %4d ms", timerInts[i]);
glutAddMenuEntry(temp, timerInts[i]);
}
}
void updateMenuEntries(int which)
{
int i;
for (i = 0; i < sizeof(timerInts) / sizeof(*timerInts); i++)
{
char temp[10] = { '\0' };
/* flag current value */
if ((which == 1 ? timerSurroundInt : timerCenterInt) == timerInts[i])
temp[0] = '+';
else
temp[0] = '-';
sprintf(temp + 1, " %4d ms", timerInts[i]);
glutChangeToMenuEntry(i+1, temp, timerInts[i]);
}
}
void MenuSurround(int timerInt)
{
timerSurroundInt = timerInt;
glutSetMenu(subMenuSurround);
updateMenuEntries(1);
}
void MenuCenter(int timerInt)
{
timerCenterInt = timerInt;
glutSetMenu(subMenuCenter);
updateMenuEntries(2);
}
int main(int argc, char **argv)
{
glutInit(&argc, argv);
glutInitWindowSize(128, 128);
glutInitDisplayMode(GLUT_RGB | GLUT_DOUBLE);
glutCreateWindow("timer test");
glutDisplayFunc(disp);
/* get timer started, its reset in the timer function itself */
glutTimerFunc(1000, timer_func, 1);
glutTimerFunc(500, timer_func, 2);
/* menus for setting timing */
subMenuSurround = glutCreateMenu(MenuSurround);
createMenuEntries(1);
subMenuCenter = glutCreateMenu(MenuCenter);
createMenuEntries(2);
menuID = glutCreateMenu(MenuSurround); /* doesn't matter, no clickable entries in this menu */
glutAddSubMenu("Center", subMenuCenter);
glutAddSubMenu("Surround", subMenuSurround);
glutAttachMenu(GLUT_RIGHT_BUTTON);
glutMainLoop();
return 0;
}
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 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 x ms */
glutTimerFunc(which == 1 ? timerSurroundInt:timerCenterInt, timer_func, which);
}