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https://github.com/QB64-Phoenix-Edition/QB64pe.git
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57 lines
1.2 KiB
C
57 lines
1.2 KiB
C
/* Timer demo
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*
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* Written by John Tsiombikas <nuclear@member.fsf.org>
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*
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* Demonstrate the use of glutTimerFunc, by changing the color of the
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* framebuffer every (approximately) 1 sec.
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*/
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#include <stdio.h>
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#include <GL/glut.h>
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void disp(void);
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void timer_func(int unused);
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/* color index will be advanced every time the timer expires */
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int cidx;
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float color[][3] = {
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{1, 0, 0},
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{0, 1, 0},
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{0, 0, 1},
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{1, 1, 0},
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{0, 1, 1},
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{1, 0, 1}
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};
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int main(int argc, char **argv)
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{
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glutInit(&argc, argv);
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glutInitWindowSize(128, 128);
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glutInitDisplayMode(GLUT_RGB | GLUT_DOUBLE);
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glutCreateWindow("timer test");
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glutDisplayFunc(disp);
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/* get timer started, its reset in the timer function itself */
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glutTimerFunc(1000, timer_func, 0);
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glutMainLoop();
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return 0;
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}
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void disp(void)
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{
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glClearColor(color[cidx][0], color[cidx][1], color[cidx][2], 1);
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glClear(GL_COLOR_BUFFER_BIT);
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glutSwapBuffers();
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}
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void timer_func(int unused)
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{
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/* advance the color index and trigger a redisplay */
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cidx = (cidx + 1) % (sizeof color / sizeof *color);
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glutPostRedisplay();
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/* (re)set the timer callback and ask glut to call it in 1 second */
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glutTimerFunc(1000, timer_func, 0);
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}
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