static void key_callback(GLFWwindow* window, int key, int scancode, int action, int mods)
{
if (action != GLFW_PRESS)
return;
switch (key)
{
case GLFW_KEY_UP:
{
if (swap_interval + 1 > swap_interval)
set_swap_interval(window, swap_interval + 1);
break;
}
case GLFW_KEY_DOWN:
{
if (swap_tear)
{
if (swap_interval - 1 < swap_interval)
set_swap_interval(window, swap_interval - 1);
}
else
{
if (swap_interval - 1 >= 0)
set_swap_interval(window, swap_interval - 1);
}
break;
}
case GLFW_KEY_ESCAPE:
glfwSetWindowShouldClose(window, 1);
break;
}
}
static void key_callback(GLFWwindow* window, int key, int scancode, int action, int mods)
{
if (action != GLFW_PRESS)
return;
switch (key)
{
case GLFW_KEY_UP:
{
if (swap_interval + 1 > swap_interval)
set_swap_interval(window, swap_interval + 1);
break;
}
case GLFW_KEY_DOWN:
{
if (swap_tear)
{
if (swap_interval - 1 < swap_interval)
set_swap_interval(window, swap_interval - 1);
}
else
{
if (swap_interval - 1 >= 0)
set_swap_interval(window, swap_interval - 1);
}
break;
}
case GLFW_KEY_ESCAPE:
glfwSetWindowShouldClose(window, 1);
break;
case GLFW_KEY_F11:
case GLFW_KEY_ENTER:
{
static int x, y, width, height;
if (mods != GLFW_MOD_ALT)
return;
if (glfwGetWindowMonitor(window))
glfwSetWindowMonitor(window, NULL, x, y, width, height, 0);
else
{
GLFWmonitor* monitor = glfwGetPrimaryMonitor();
const GLFWvidmode* mode = glfwGetVideoMode(monitor);
glfwGetWindowPos(window, &x, &y);
glfwGetWindowSize(window, &width, &height);
glfwSetWindowMonitor(window, monitor,
0, 0, mode->width, mode->height,
mode->refreshRate);
}
break;
}
}
}
int main(void)
{
float position;
unsigned long frame_count = 0;
double last_time, current_time;
GLFWwindow* window;
glfwSetErrorCallback(error_callback);
if (!glfwInit())
exit(EXIT_FAILURE);
window = glfwCreateWindow(640, 480, "", NULL, NULL);
if (!window)
{
glfwTerminate();
exit(EXIT_FAILURE);
}
glfwMakeContextCurrent(window);
set_swap_interval(window, 0);
last_time = glfwGetTime();
frame_rate = 0.0;
glfwSetWindowSizeCallback(window, window_size_callback);
glfwSetKeyCallback(window, key_callback);
glMatrixMode(GL_PROJECTION);
glOrtho(-1.f, 1.f, -1.f, 1.f, 1.f, -1.f);
glMatrixMode(GL_MODELVIEW);
while (!glfwWindowShouldClose(window))
{
glClear(GL_COLOR_BUFFER_BIT);
position = cosf((float) glfwGetTime() * 4.f) * 0.75f;
glRectf(position - 0.25f, -1.f, position + 0.25f, 1.f);
glfwSwapBuffers(window);
glfwPollEvents();
frame_count++;
current_time = glfwGetTime();
if (current_time - last_time > 1.0)
{
frame_rate = frame_count / (current_time - last_time);
frame_count = 0;
last_time = current_time;
update_window_title(window);
}
}
glfwTerminate();
exit(EXIT_SUCCESS);
}
int main(void)
{
GLFWwindow window;
int width, height;
if (!glfwInit())
{
fprintf(stderr, "Failed to initialize GLFW: %s\n", glfwErrorString(glfwGetError()));
exit(EXIT_FAILURE);
}
window = glfwCreateWindow(window_width, window_height, GLFW_WINDOWED, "", NULL);
if (!window)
{
glfwTerminate();
fprintf(stderr, "Failed to open GLFW window: %s\n", glfwErrorString(glfwGetError()));
exit(EXIT_FAILURE);
}
glfwSetCursorPosCallback(window, cursor_position_callback);
glfwSetWindowSizeCallback(window, window_size_callback);
glfwSetKeyCallback(window, key_callback);
glfwMakeContextCurrent(window);
glfwGetWindowSize(window, &width, &height);
window_size_callback(window, width, height);
set_swap_interval(window, swap_interval);
while (!glfwGetWindowParam(window, GLFW_CLOSE_REQUESTED))
{
glClear(GL_COLOR_BUFFER_BIT);
glBegin(GL_LINES);
glVertex2f(0.f, (GLfloat) window_height - cursor_y);
glVertex2f((GLfloat) window_width, (GLfloat) window_height - cursor_y);
glVertex2f((GLfloat) cursor_x, 0.f);
glVertex2f((GLfloat) cursor_x, (GLfloat) window_height);
glEnd();
glfwSwapBuffers(window);
glfwPollEvents();
}
glfwTerminate();
exit(EXIT_SUCCESS);
}
int main(void)
{
GLFWwindow* window;
int width, height;
glfwSetErrorCallback(error_callback);
if (!glfwInit())
exit(EXIT_FAILURE);
window = glfwCreateWindow(window_width, window_height, "", NULL, NULL);
if (!window)
{
glfwTerminate();
exit(EXIT_FAILURE);
}
glfwSetCursorPosCallback(window, cursor_position_callback);
glfwSetFramebufferSizeCallback(window, framebuffer_size_callback);
glfwSetKeyCallback(window, key_callback);
glfwMakeContextCurrent(window);
glfwGetFramebufferSize(window, &width, &height);
framebuffer_size_callback(window, width, height);
set_swap_interval(window, swap_interval);
while (!glfwWindowShouldClose(window))
{
glClear(GL_COLOR_BUFFER_BIT);
glBegin(GL_LINES);
glVertex2f(0.f, (GLfloat) window_height - cursor_y);
glVertex2f((GLfloat) window_width, (GLfloat) window_height - cursor_y);
glVertex2f((GLfloat) cursor_x, 0.f);
glVertex2f((GLfloat) cursor_x, (GLfloat) window_height);
glEnd();
glfwSwapBuffers(window);
glfwPollEvents();
}
glfwTerminate();
exit(EXIT_SUCCESS);
}
int main(void)
{
float position;
GLFWwindow window;
glfwSetErrorCallback(error_callback);
if (!glfwInit())
exit(EXIT_FAILURE);
window = glfwCreateWindow(640, 480, GLFW_WINDOWED, "", NULL);
if (!window)
{
glfwTerminate();
exit(EXIT_FAILURE);
}
glfwMakeContextCurrent(window);
set_swap_interval(window, swap_interval);
glfwSetWindowSizeCallback(window, window_size_callback);
glfwSetKeyCallback(window, key_callback);
glMatrixMode(GL_PROJECTION);
glOrtho(-1.f, 1.f, -1.f, 1.f, 1.f, -1.f);
glMatrixMode(GL_MODELVIEW);
while (!glfwGetWindowParam(window, GLFW_CLOSE_REQUESTED))
{
glClear(GL_COLOR_BUFFER_BIT);
position = cosf(glfwGetTime() * 4.f) * 0.75f;
glRectf(position - 0.25f, -1.f, position + 0.25f, 1.f);
glfwSwapBuffers(window);
glfwPollEvents();
}
glfwTerminate();
exit(EXIT_SUCCESS);
}
int main(int argc, char** argv)
{
unsigned long frame_count = 0;
double last_time, current_time;
GLFWwindow* window;
GLuint vertex_buffer, vertex_shader, fragment_shader, program;
GLint mvp_location, vpos_location;
glfwSetErrorCallback(error_callback);
if (!glfwInit())
exit(EXIT_FAILURE);
glfwWindowHint(GLFW_CONTEXT_VERSION_MAJOR, 2);
glfwWindowHint(GLFW_CONTEXT_VERSION_MINOR, 0);
window = glfwCreateWindow(640, 480, "Tearing detector", NULL, NULL);
if (!window)
{
glfwTerminate();
exit(EXIT_FAILURE);
}
glfwMakeContextCurrent(window);
gladLoadGL(glfwGetProcAddress);
set_swap_interval(window, 0);
last_time = glfwGetTime();
frame_rate = 0.0;
swap_tear = (glfwExtensionSupported("WGL_EXT_swap_control_tear") ||
glfwExtensionSupported("GLX_EXT_swap_control_tear"));
glfwSetKeyCallback(window, key_callback);
glGenBuffers(1, &vertex_buffer);
glBindBuffer(GL_ARRAY_BUFFER, vertex_buffer);
glBufferData(GL_ARRAY_BUFFER, sizeof(vertices), vertices, GL_STATIC_DRAW);
vertex_shader = glCreateShader(GL_VERTEX_SHADER);
glShaderSource(vertex_shader, 1, &vertex_shader_text, NULL);
glCompileShader(vertex_shader);
fragment_shader = glCreateShader(GL_FRAGMENT_SHADER);
glShaderSource(fragment_shader, 1, &fragment_shader_text, NULL);
glCompileShader(fragment_shader);
program = glCreateProgram();
glAttachShader(program, vertex_shader);
glAttachShader(program, fragment_shader);
glLinkProgram(program);
mvp_location = glGetUniformLocation(program, "MVP");
vpos_location = glGetAttribLocation(program, "vPos");
glEnableVertexAttribArray(vpos_location);
glVertexAttribPointer(vpos_location, 2, GL_FLOAT, GL_FALSE,
sizeof(vertices[0]), (void*) 0);
while (!glfwWindowShouldClose(window))
{
int width, height;
mat4x4 m, p, mvp;
float position = cosf((float) glfwGetTime() * 4.f) * 0.75f;
glfwGetFramebufferSize(window, &width, &height);
glViewport(0, 0, width, height);
glClear(GL_COLOR_BUFFER_BIT);
mat4x4_ortho(p, -1.f, 1.f, -1.f, 1.f, 0.f, 1.f);
mat4x4_translate(m, position, 0.f, 0.f);
mat4x4_mul(mvp, p, m);
glUseProgram(program);
glUniformMatrix4fv(mvp_location, 1, GL_FALSE, (const GLfloat*) mvp);
glDrawArrays(GL_TRIANGLE_FAN, 0, 4);
glfwSwapBuffers(window);
glfwPollEvents();
frame_count++;
current_time = glfwGetTime();
if (current_time - last_time > 1.0)
{
frame_rate = frame_count / (current_time - last_time);
frame_count = 0;
last_time = current_time;
update_window_title(window);
}
}
glfwTerminate();
exit(EXIT_SUCCESS);
}
static void key_callback(GLFWwindow* window, int key, int scancode, int action, int mods)
{
if (key == GLFW_KEY_SPACE && action == GLFW_PRESS)
set_swap_interval(window, 1 - swap_interval);
}
int main(int argc, char** argv)
{
int ch, width, height;
float position;
unsigned long frame_count = 0;
double last_time, current_time;
GLboolean fullscreen = GL_FALSE;
GLFWmonitor* monitor = NULL;
GLFWwindow* window;
while ((ch = getopt(argc, argv, "fh")) != -1)
{
switch (ch)
{
case 'h':
usage();
exit(EXIT_SUCCESS);
case 'f':
fullscreen = GL_TRUE;
break;
}
}
glfwSetErrorCallback(error_callback);
if (!glfwInit())
exit(EXIT_FAILURE);
if (fullscreen)
{
const GLFWvidmode* mode;
monitor = glfwGetPrimaryMonitor();
mode = glfwGetVideoMode(monitor);
glfwWindowHint(GLFW_RED_BITS, mode->redBits);
glfwWindowHint(GLFW_GREEN_BITS, mode->greenBits);
glfwWindowHint(GLFW_BLUE_BITS, mode->blueBits);
glfwWindowHint(GLFW_REFRESH_RATE, mode->refreshRate);
width = mode->width;
height = mode->height;
}
else
{
width = 640;
height = 480;
}
window = glfwCreateWindow(width, height, "", monitor, NULL);
if (!window)
{
glfwTerminate();
exit(EXIT_FAILURE);
}
glfwMakeContextCurrent(window);
set_swap_interval(window, 0);
last_time = glfwGetTime();
frame_rate = 0.0;
swap_tear = (glfwExtensionSupported("WGL_EXT_swap_control_tear") ||
glfwExtensionSupported("GLX_EXT_swap_control_tear"));
glfwSetFramebufferSizeCallback(window, framebuffer_size_callback);
glfwSetKeyCallback(window, key_callback);
glMatrixMode(GL_PROJECTION);
glOrtho(-1.f, 1.f, -1.f, 1.f, 1.f, -1.f);
glMatrixMode(GL_MODELVIEW);
while (!glfwWindowShouldClose(window))
{
glClear(GL_COLOR_BUFFER_BIT);
position = cosf((float) glfwGetTime() * 4.f) * 0.75f;
glRectf(position - 0.25f, -1.f, position + 0.25f, 1.f);
glfwSwapBuffers(window);
glfwPollEvents();
frame_count++;
current_time = glfwGetTime();
if (current_time - last_time > 1.0)
{
frame_rate = frame_count / (current_time - last_time);
frame_count = 0;
last_time = current_time;
update_window_title(window);
}
}
glfwTerminate();
exit(EXIT_SUCCESS);
}