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glfw/tests/joysticks.c

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//========================================================================
// Joystick input test
// Copyright (c) Camilla Berglund <elmindreda@elmindreda.org>
//
// This software is provided 'as-is', without any express or implied
// warranty. In no event will the authors be held liable for any damages
// arising from the use of this software.
//
// Permission is granted to anyone to use this software for any purpose,
// including commercial applications, and to alter it and redistribute it
// freely, subject to the following restrictions:
//
// 1. The origin of this software must not be misrepresented; you must not
// claim that you wrote the original software. If you use this software
// in a product, an acknowledgment in the product documentation would
// be appreciated but is not required.
//
// 2. Altered source versions must be plainly marked as such, and must not
// be misrepresented as being the original software.
//
// 3. This notice may not be removed or altered from any source
// distribution.
//
//========================================================================
//
// This test displays the state of every button and axis of every connected
// joystick and/or gamepad
//
//========================================================================
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#include <GLFW/glfw3.h>
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#include <stdio.h>
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#include <string.h>
#include <stdlib.h>
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#ifdef _MSC_VER
#define strdup(x) _strdup(x)
#endif
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typedef struct Joystick
{
GLboolean present;
char* name;
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float* axes;
unsigned char* buttons;
int axis_count;
int button_count;
} Joystick;
static Joystick joysticks[GLFW_JOYSTICK_LAST - GLFW_JOYSTICK_1 + 1];
static int joystick_count = 0;
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static void error_callback(int error, const char* description)
{
fprintf(stderr, "Error: %s\n", description);
}
static void framebuffer_size_callback(GLFWwindow* window, int width, int height)
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{
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glViewport(0, 0, width, height);
}
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static void draw_joystick(Joystick* j, int x, int y, int width, int height)
{
int i;
int axis_width, axis_height;
int button_width, button_height;
axis_width = width / j->axis_count;
axis_height = 3 * height / 4;
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button_width = width / j->button_count;
button_height = height / 4;
for (i = 0; i < j->axis_count; i++)
{
float value = j->axes[i] / 2.f + 0.5f;
glColor3f(0.3f, 0.3f, 0.3f);
glRecti(x + i * axis_width,
y,
x + (i + 1) * axis_width,
y + axis_height);
glColor3f(1.f, 1.f, 1.f);
glRecti(x + i * axis_width,
y + (int) (value * (axis_height - 5)),
x + (i + 1) * axis_width,
y + 5 + (int) (value * (axis_height - 5)));
}
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for (i = 0; i < j->button_count; i++)
{
if (j->buttons[i])
glColor3f(1.f, 1.f, 1.f);
else
glColor3f(0.3f, 0.3f, 0.3f);
glRecti(x + i * button_width,
y + axis_height,
x + (i + 1) * button_width,
y + axis_height + button_height);
}
}
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static void draw_joysticks(GLFWwindow* window)
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{
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int i, width, height;
glfwGetFramebufferSize(window, &width, &height);
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glMatrixMode(GL_PROJECTION);
glLoadIdentity();
glOrtho(0.f, width, height, 0.f, 1.f, -1.f);
glMatrixMode(GL_MODELVIEW);
for (i = 0; i < sizeof(joysticks) / sizeof(Joystick); i++)
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{
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Joystick* j = joysticks + i;
if (j->present)
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{
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draw_joystick(j,
0, i * height / joystick_count,
width, height / joystick_count);
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}
}
}
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static void refresh_joysticks(void)
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{
int i;
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for (i = 0; i < sizeof(joysticks) / sizeof(Joystick); i++)
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{
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Joystick* j = joysticks + i;
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if (glfwJoystickPresent(GLFW_JOYSTICK_1 + i))
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{
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const float* axes;
const unsigned char* buttons;
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int axis_count, button_count;
free(j->name);
j->name = strdup(glfwGetJoystickName(GLFW_JOYSTICK_1 + i));
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axes = glfwGetJoystickAxes(GLFW_JOYSTICK_1 + i, &axis_count);
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if (axis_count != j->axis_count)
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{
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j->axis_count = axis_count;
j->axes = realloc(j->axes, j->axis_count * sizeof(float));
}
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memcpy(j->axes, axes, axis_count * sizeof(float));
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buttons = glfwGetJoystickButtons(GLFW_JOYSTICK_1 + i, &button_count);
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if (button_count != j->button_count)
{
j->button_count = button_count;
j->buttons = realloc(j->buttons, j->button_count);
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}
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memcpy(j->buttons, buttons, button_count * sizeof(unsigned char));
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if (!j->present)
{
printf("Found joystick %i named \'%s\' with %i axes, %i buttons\n",
i + 1, j->name, j->axis_count, j->button_count);
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joystick_count++;
}
j->present = GL_TRUE;
}
else
{
if (j->present)
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{
printf("Lost joystick %i named \'%s\'\n", i + 1, j->name);
free(j->name);
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free(j->axes);
free(j->buttons);
memset(j, 0, sizeof(Joystick));
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joystick_count--;
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}
}
}
}
int main(void)
{
GLFWwindow* window;
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memset(joysticks, 0, sizeof(joysticks));
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glfwSetErrorCallback(error_callback);
if (!glfwInit())
exit(EXIT_FAILURE);
window = glfwCreateWindow(640, 480, "Joystick Test", NULL, NULL);
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if (!window)
{
glfwTerminate();
exit(EXIT_FAILURE);
}
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glfwSetFramebufferSizeCallback(window, framebuffer_size_callback);
glfwMakeContextCurrent(window);
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glfwSwapInterval(1);
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while (!glfwWindowShouldClose(window))
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{
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glClear(GL_COLOR_BUFFER_BIT);
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refresh_joysticks();
draw_joysticks(window);
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glfwSwapBuffers(window);
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glfwPollEvents();
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}
glfwTerminate();
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exit(EXIT_SUCCESS);
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}