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added command line parameter to set spin speed

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This commit is contained in:
Lexxy Fox 2023-11-02 11:41:51 -05:00
parent c32f4bdf09
commit e970b2f661
1 changed files with 20 additions and 4 deletions
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24
glxgears.c
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@ -242,6 +242,8 @@ static void draw(void) {
}
}
static GLfloat rotation_speed = 70.0;
static void idle(void) {
static double t0 = -1.;
double dt, t = glutGet(GLUT_ELAPSED_TIME) / 1000.0;
@ -250,8 +252,8 @@ static void idle(void) {
dt = t - t0;
t0 = t;
angle += 70.0 * dt; /* 70 degrees per second */
angle = fmod(angle, 360.0); /* prevents eventual overflow */
angle += rotation_speed * dt; /* 70 degrees per second */
angle = fmod(angle, 360.0); /* prevents eventual overflow */
glutPostRedisplay();
}
@ -377,11 +379,17 @@ static void visible(int vis) {
static char *window_title = "Gears";
#ifdef USE_ARGP
static const struct argp_option options[] = {
{"info", 256, 0, 0, "Display OpenGL renderer information"},
{"exit", 257, 0, 0, "Automatically exit after 30 seconds"},
{"noanim", 258, 0, 0, "Don't start animation"},
{"title", 259, "title", 0, "Set window title (defaults to \"Gears\")"},
{"spin",
259,
"speed",
0,
"Set rotational speed in RPM (defaults to 11.666666667)"},
{"title", 260, "title", 0, "Set window title (defaults to \"Gears\")"},
{0}};
static error_t parse_opt(int key, char *val, struct argp_state *) {
@ -396,6 +404,9 @@ static error_t parse_opt(int key, char *val, struct argp_state *) {
Animate = GL_FALSE;
break;
case 259:
rotation_speed = atof(val) * 6;
break;
case 260:
window_title = val;
break;
}
@ -403,7 +414,12 @@ static error_t parse_opt(int key, char *val, struct argp_state *) {
}
static const struct argp argp = {
options, parse_opt, 0, "Universal rights are universal."};
options,
parse_opt,
0,
"The glxgears program is a port of the `gears` demo to GLX. It displays a "
"set of rotating gears and prints out the frame rate at regular intervals. "
"It has become quite popular as basic benchmarking tool."};
#else
static void parse_args(int argc, char *argv[]) {
for (GLint i = 1; i < argc; i++)