added the timer demo

git-svn-id: https://svn.code.sf.net/p/freeglut/code/trunk@1100 7f0cb862-5218-0410-a997-914c9d46530a

.gitattributes

@@ -126,6 +126,7 @@ freeglut/freeglut/progs/demos/subwin/Makefile.am -text
 freeglut/freeglut/progs/demos/subwin/subwin.c -text
 freeglut/freeglut/progs/demos/subwin/subwin.dsp -text
 freeglut/freeglut/progs/demos/subwin/subwinStatic.dsp -text
+freeglut/freeglut/progs/demos/timer/timer.c -text
 freeglut/freeglut/src/Common/freeglut_callbacks.c svn_keywords=Author+Date+Id+Revision
 freeglut/freeglut/src/Common/freeglut_cursor.c svn_keywords=Author+Date+Id+Revision
 freeglut/freeglut/src/Common/freeglut_display.c svn_keywords=Author+Date+Id+Revision

freeglut/freeglut/CMakeLists.txt

@@ -219,5 +219,4 @@ ADD_DEMO(spaceball       progs/demos/spaceball/spaceball.c
                          progs/demos/spaceball/vmath.c
                          progs/demos/spaceball/vmath.h)
 ADD_DEMO(subwin          progs/demos/subwin/subwin.c)
-
+ADD_DEMO(timer           progs/demos/timer/timer.c)
-

freeglut/freeglut/progs/demos/timer/timer.c

@@ -0,0 +1,53 @@
+/* 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;
+float color[][3] = {
+	{1, 0, 0},
+	{0, 1, 0},
+	{0, 0, 1},
+	{1, 1, 0},
+	{0, 1, 1},
+	{1, 0, 1}
+};
+
+int main(int argc, char **argv)
+{
+	glutInit(&argc, argv);
+	glutInitWindowSize(128, 128);
+	glutInitDisplayMode(GLUT_RGB | GLUT_DOUBLE);
+	glutCreateWindow("timer test");
+
+	glutDisplayFunc(disp);
+
+	glutMainLoop();
+	return 0;
+}
+
+void disp(void)
+{
+	glClearColor(color[cidx][0], color[cidx][1], color[cidx][2], 1);
+	glClear(GL_COLOR_BUFFER_BIT);
+
+	/* set the timer callback and ask glut to call it in 1 second */
+	glutTimerFunc(1000, timer_func, 0);
+	glutSwapBuffers();
+}
+
+void timer_func(int unused)
+{
+	/* advance the color index and trigger a redisplay */
+	cidx = (cidx + 1) % (sizeof color / sizeof *color);
+	glutPostRedisplay();
+}