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//========================================================================
// Empty event test
// Copyright (c) Camilla Löwy <elmindreda@glfw.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 is intended to verify that posting of empty events works
//
//========================================================================
#include "tinycthread.h"
#include <glad/gl.h>
#define GLFW_INCLUDE_NONE
#include <GLFW/glfw3.h>
#include <math.h>
#include <stdio.h>
#include <stdlib.h>
static volatile int running = GLFW_TRUE;
static void error_callback(int error, const char* description)
{
fprintf(stderr, "Error: %s\n", description);
}
static int thread_main(void* data)
{
struct timespec time;
while (running)
{
clock_gettime(CLOCK_REALTIME, &time);
time.tv_sec += 1;
thrd_sleep(&time, NULL);
glfwPostEmptyEvent();
}
return 0;
}
static void key_callback(GLFWwindow* window, int key, int scancode, int action, int mods)
{
if (key == GLFW_KEY_ESCAPE && action == GLFW_PRESS)
glfwSetWindowShouldClose(window, GLFW_TRUE);
}
static float nrand(void)
{
return (float) rand() / (float) RAND_MAX;
}
int main(void)
{
int result;
thrd_t thread;
GLFWwindow* window;
srand((unsigned int) time(NULL));
glfwSetErrorCallback(error_callback);
if (!glfwInit())
exit(EXIT_FAILURE);
window = glfwCreateWindow(640, 480, "Empty Event Test", NULL, NULL);
if (!window)
{
glfwTerminate();
exit(EXIT_FAILURE);
}
glfwMakeContextCurrent(window);
gladLoadGL(glfwGetProcAddress);
glfwSetKeyCallback(window, key_callback);
if (thrd_create(&thread, thread_main, NULL) != thrd_success)
{
fprintf(stderr, "Failed to create secondary thread\n");
glfwTerminate();
exit(EXIT_FAILURE);
}
while (running)
{
int width, height;
float r = nrand(), g = nrand(), b = nrand();
float l = (float) sqrt(r * r + g * g + b * b);
glfwGetFramebufferSize(window, &width, &height);
glViewport(0, 0, width, height);
glClearColor(r / l, g / l, b / l, 1.f);
glClear(GL_COLOR_BUFFER_BIT);
glfwSwapBuffers(window);
glfwWaitEvents();
if (glfwWindowShouldClose(window))
running = GLFW_FALSE;
}
glfwHideWindow(window);
thrd_join(thread, &result);
glfwDestroyWindow(window);
glfwTerminate();
exit(EXIT_SUCCESS);
}
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