1 //========================================================================
2 // Event wait timeout test
3 // Copyright (c) Camilla Löwy <elmindreda@glfw.org>
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
error_callback(int error,const char * description)40 static void error_callback(int error, const char* description)
41 {
42 fprintf(stderr, "Error: %s\n", description);
43 }
44
key_callback(GLFWwindow * window,int key,int scancode,int action,int mods)45 static void key_callback(GLFWwindow* window, int key, int scancode, int action, int mods)
46 {
47 if (key == GLFW_KEY_ESCAPE && action == GLFW_PRESS)
48 glfwSetWindowShouldClose(window, GLFW_TRUE);
49 }
50
nrand(void)51 static float nrand(void)
52 {
53 return (float) rand() / (float) RAND_MAX;
54 }
55
main(void)56 int main(void)
57 {
58 GLFWwindow* window;
59
60 srand((unsigned int) time(NULL));
61
62 glfwSetErrorCallback(error_callback);
63
64 if (!glfwInit())
65 exit(EXIT_FAILURE);
66
67 window = glfwCreateWindow(640, 480, "Event Wait Timeout Test", NULL, NULL);
68 if (!window)
69 {
70 glfwTerminate();
71 exit(EXIT_FAILURE);
72 }
73
74 glfwMakeContextCurrent(window);
75 gladLoadGL(glfwGetProcAddress);
76 glfwSetKeyCallback(window, key_callback);
77
78 while (!glfwWindowShouldClose(window))
79 {
80 int width, height;
81 float r = nrand(), g = nrand(), b = nrand();
82 float l = (float) sqrt(r * r + g * g + b * b);
83
84 glfwGetFramebufferSize(window, &width, &height);
85
86 glViewport(0, 0, width, height);
87 glClearColor(r / l, g / l, b / l, 1.f);
88 glClear(GL_COLOR_BUFFER_BIT);
89 glfwSwapBuffers(window);
90
91 glfwWaitEventsTimeout(1.0);
92 }
93
94 glfwDestroyWindow(window);
95
96 glfwTerminate();
97 exit(EXIT_SUCCESS);
98 }
99
100