Atlas - timeout.c
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1//========================================================================
2// Event wait timeout test
3// Copyright (c) Camilla Löwy <[email protected]>
4//
5// This software is provided 'as-is', without any express or implied
6// warranty. In no event will the authors be held liable for any damages
7// arising from the use of this software.
8//
9// Permission is granted to anyone to use this software for any purpose,
10// including commercial applications, and to alter it and redistribute it
11// freely, subject to the following restrictions:
12//
13// 1. The origin of this software must not be misrepresented; you must not
14//    claim that you wrote the original software. If you use this software
15//    in a product, an acknowledgment in the product documentation would
16//    be appreciated but is not required.
17//
18// 2. Altered source versions must be plainly marked as such, and must not
19//    be misrepresented as being the original software.
20//
21// 3. This notice may not be removed or altered from any source
22//    distribution.
23//
24//========================================================================
25//
26// This test is intended to verify that waiting for events with timeout works
27//
28//========================================================================
29
30#define GLAD_GL_IMPLEMENTATION
31#include <glad/gl.h>
32#define GLFW_INCLUDE_NONE
33#include <GLFW/glfw3.h>
34
35#include <time.h>
36#include <math.h>
37#include <stdio.h>
38#include <stdlib.h>
39#include <stdbool.h>
40
41static bool needs_update;
42
43static void window_close_callback(GLFWwindow* window)
44{
45    needs_update = true;
46}
47
48static void error_callback(int error, const char* description)
49{
50    fprintf(stderr, "Error: %s\n", description);
51}
52
53static void key_callback(GLFWwindow* window, int key, int scancode, int action, int mods)
54{
55    if (key == GLFW_KEY_ESCAPE && action == GLFW_PRESS)
56    {
57        glfwSetWindowShouldClose(window, GLFW_TRUE);
58        needs_update = true;
59    }
60}
61
62static void framebuffer_size_callback(GLFWwindow* window, int width, int height)
63{
64    needs_update = true;
65}
66
67static float nrand(void)
68{
69    return (float) rand() / (float) RAND_MAX;
70}
71
72int main(void)
73{
74    GLFWwindow* window;
75
76    srand((unsigned int) time(NULL));
77
78    glfwSetErrorCallback(error_callback);
79
80    if (!glfwInit())
81        exit(EXIT_FAILURE);
82
83    window = glfwCreateWindow(640, 480, "Event Wait Timeout Test", NULL, NULL);
84    if (!window)
85    {
86        glfwTerminate();
87        exit(EXIT_FAILURE);
88    }
89
90    glfwMakeContextCurrent(window);
91    glfwSwapInterval(0);
92    gladLoadGL(glfwGetProcAddress);
93    glfwSetWindowCloseCallback(window, window_close_callback);
94    glfwSetKeyCallback(window, key_callback);
95    glfwSetFramebufferSizeCallback(window, framebuffer_size_callback);
96
97    while (!glfwWindowShouldClose(window))
98    {
99        int width, height;
100        float r = nrand(), g = nrand(), b = nrand();
101        float l = (float) sqrt(r * r + g * g + b * b);
102
103        glfwGetFramebufferSize(window, &width, &height);
104
105        glViewport(0, 0, width, height);
106        glClearColor(r / l, g / l, b / l, 1.f);
107        glClear(GL_COLOR_BUFFER_BIT);
108        glfwSwapBuffers(window);
109        needs_update = false;
110
111        const double start = glfwGetTime();
112
113        while (!needs_update)
114        {
115            const double elapsed = glfwGetTime() - start;
116            if (elapsed >= 1.0)
117                needs_update = true;
118            else
119                glfwWaitEventsTimeout(1.0 - elapsed);
120        }
121    }
122
123    glfwDestroyWindow(window);
124
125    glfwTerminate();
126    exit(EXIT_SUCCESS);
127}
128
129
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