glfw/tests/joysticks.c

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/*========================================================================
* This is a small test application for GLFW.
* joystick input test.
*========================================================================*/
#include <GL/glfw3.h>
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#include <stdio.h>
#include <stdlib.h>
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#include <math.h>
#define MAX_AXES 10
#define MAX_BUTTONS 30
struct JoystickState
{
int present;
int num_axes;
int num_buttons;
float axes[MAX_AXES];
unsigned char buttons[MAX_BUTTONS];
};
static struct JoystickState states[GLFW_JOYSTICK_LAST + 1];
int running;
int keyrepeat = 0;
int systemkeys = 1;
/*========================================================================
* Retrieve joystick states
*========================================================================*/
static void updateJoysticksState(void)
{
int joy;
for (joy = GLFW_JOYSTICK_1; joy < GLFW_JOYSTICK_LAST + 1; joy++)
{
printf("Updating information for joystick %d\n", joy);
states[joy].present = glfwGetJoystickParam(joy, GLFW_PRESENT);
if (states[joy].present == GL_TRUE)
{
states[joy].num_axes = glfwGetJoystickPos(joy, states[joy].axes, MAX_AXES);
states[joy].num_buttons = glfwGetJoystickButtons(joy, states[joy].buttons, MAX_BUTTONS);
}
}
}
/*========================================================================
* Print out the state of all joysticks on the standard output
*========================================================================*/
static void displayJoysticksState(void)
{
int joy;
int i;
for (joy = GLFW_JOYSTICK_1; joy < GLFW_JOYSTICK_LAST + 1; joy++)
{
printf("Joystick %d: %s\n", joy, (states[joy].present == GL_TRUE ? "present" : "not connected"));
if (states[joy].present == GL_TRUE)
{
if (states[joy].num_axes > 0)
{
printf(" axes: %.3f", states[joy].axes[0]);
for (i = 1; i < states[joy].num_axes; i++)
printf(", %.3f", states[joy].axes[i]);
printf("\n");
}
else
printf(" axes: none\n");
if (states[joy].num_buttons > 0)
{
printf(" buttons: 00 => %c", ((states[joy].buttons[0] == GLFW_PRESS) ? 'P' : 'R'));
for (i = 1; i < states[joy].num_buttons; i++)
printf(", %02d => %c", i, ((states[joy].buttons[i] == GLFW_PRESS) ? 'P' : 'R'));
printf("\n");
}
else
printf(" buttons: none\n");
}
}
}
int main(void)
{
double start;
double t;
double update;
/* Initialise GLFW */
if (!glfwInit())
{
fprintf(stderr, "Failed to initialize GLFW: %s\n", glfwErrorString(glfwGetError()));
exit(EXIT_FAILURE);
}
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printf("The program will work for 20 seconds and display every seconds the state of the joysticks\n");
printf("Your computer is going to be very slow as the program is doing an active loop .....\n");
start = glfwGetTime();
update = start;
/* print the initial state of all joysticks */
updateJoysticksState();
printf("\n");
displayJoysticksState();
running = GL_TRUE;
/* Main loop */
while (running)
{
/* Get time */
t = glfwGetTime();
/* Display the state of all connected joysticks every secons */
if ((t - update) > 1.0)
{
update = t;
printf("\n");
updateJoysticksState();
printf("\n");
displayJoysticksState();
}
/* Check if the window was closed */
if ((t - start) > 20.0)
running = GL_FALSE;
}
/* Close OpenGL window and terminate GLFW */
glfwTerminate();
return 0;
}