glfw/tests/tearing.c

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//========================================================================
// Vsync enabling test
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// Copyright (c) Camilla Berglund <elmindreda@glfw.org>
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//
// 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 renders a high contrast, horizontally moving bar, allowing for
// visual verification of whether the set swap interval is indeed obeyed
//
//========================================================================
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#include <glad/glad.h>
#include <GLFW/glfw3.h>
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#include <stdio.h>
#include <stdlib.h>
#include <math.h>
#include "getopt.h"
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static int swap_tear;
static int swap_interval;
static double frame_rate;
static void usage(void)
{
printf("Usage: tearing [-h] [-f]\n");
printf("Options:\n");
printf(" -f create full screen window\n");
printf(" -h show this help\n");
}
static void update_window_title(GLFWwindow* window)
{
char title[256];
sprintf(title, "Tearing detector (interval %i%s, %0.1f Hz)",
swap_interval,
(swap_tear && swap_interval < 0) ? " (swap tear)" : "",
frame_rate);
glfwSetWindowTitle(window, title);
}
static void set_swap_interval(GLFWwindow* window, int interval)
{
swap_interval = interval;
glfwSwapInterval(swap_interval);
update_window_title(window);
}
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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{
glViewport(0, 0, width, height);
}
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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;
}
}
int main(int argc, char** argv)
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{
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int ch, width, height;
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float position;
unsigned long frame_count = 0;
double last_time, current_time;
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int fullscreen = GLFW_FALSE;
GLFWmonitor* monitor = NULL;
GLFWwindow* window;
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while ((ch = getopt(argc, argv, "fh")) != -1)
{
switch (ch)
{
case 'h':
usage();
exit(EXIT_SUCCESS);
case 'f':
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fullscreen = GLFW_TRUE;
break;
}
}
glfwSetErrorCallback(error_callback);
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if (!glfwInit())
exit(EXIT_FAILURE);
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if (fullscreen)
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{
const GLFWvidmode* mode;
monitor = glfwGetPrimaryMonitor();
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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;
}
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window = glfwCreateWindow(width, height, "", monitor, NULL);
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if (!window)
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{
glfwTerminate();
exit(EXIT_FAILURE);
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}
glfwMakeContextCurrent(window);
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gladLoadGLLoader((GLADloadproc) 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"));
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glfwSetFramebufferSizeCallback(window, framebuffer_size_callback);
glfwSetKeyCallback(window, key_callback);
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glMatrixMode(GL_PROJECTION);
glOrtho(-1.f, 1.f, -1.f, 1.f, 1.f, -1.f);
glMatrixMode(GL_MODELVIEW);
while (!glfwWindowShouldClose(window))
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{
glClear(GL_COLOR_BUFFER_BIT);
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position = cosf((float) glfwGetTime() * 4.f) * 0.75f;
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glRectf(position - 0.25f, -1.f, position + 0.25f, 1.f);
glfwSwapBuffers(window);
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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);
}
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}
glfwTerminate();
exit(EXIT_SUCCESS);
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}