1 //========================================================================
2 // Empty event 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 posting of empty events works
27 //
28 //========================================================================
29
30 #include "tinycthread.h"
31
32 #define GLAD_GL_IMPLEMENTATION
33 #include <glad/gl.h>
34 #define GLFW_INCLUDE_NONE
35 #include <GLFW/glfw3.h>
36
37 #include <math.h>
38 #include <stdio.h>
39 #include <stdlib.h>
40
41 static volatile int running = GLFW_TRUE;
42
error_callback(int error,const char * description)43 static void error_callback(int error, const char* description)
44 {
45 fprintf(stderr, "Error: %s\n", description);
46 }
47
thread_main(void * data)48 static int thread_main(void* data)
49 {
50 struct timespec time;
51
52 while (running)
53 {
54 clock_gettime(CLOCK_REALTIME, &time);
55 time.tv_sec += 1;
56 thrd_sleep(&time, NULL);
57
58 glfwPostEmptyEvent();
59 }
60
61 return 0;
62 }
63
key_callback(GLFWwindow * window,int key,int scancode,int action,int mods)64 static void key_callback(GLFWwindow* window, int key, int scancode, int action, int mods)
65 {
66 if (key == GLFW_KEY_ESCAPE && action == GLFW_PRESS)
67 glfwSetWindowShouldClose(window, GLFW_TRUE);
68 }
69
nrand(void)70 static float nrand(void)
71 {
72 return (float) rand() / (float) RAND_MAX;
73 }
74
main(void)75 int main(void)
76 {
77 int result;
78 thrd_t thread;
79 GLFWwindow* window;
80
81 srand((unsigned int) time(NULL));
82
83 glfwSetErrorCallback(error_callback);
84
85 if (!glfwInit())
86 exit(EXIT_FAILURE);
87
88 window = glfwCreateWindow(640, 480, "Empty Event Test", NULL, NULL);
89 if (!window)
90 {
91 glfwTerminate();
92 exit(EXIT_FAILURE);
93 }
94
95 glfwMakeContextCurrent(window);
96 gladLoadGL(glfwGetProcAddress);
97 glfwSetKeyCallback(window, key_callback);
98
99 if (thrd_create(&thread, thread_main, NULL) != thrd_success)
100 {
101 fprintf(stderr, "Failed to create secondary thread\n");
102
103 glfwTerminate();
104 exit(EXIT_FAILURE);
105 }
106
107 while (running)
108 {
109 int width, height;
110 float r = nrand(), g = nrand(), b = nrand();
111 float l = (float) sqrt(r * r + g * g + b * b);
112
113 glfwGetFramebufferSize(window, &width, &height);
114
115 glViewport(0, 0, width, height);
116 glClearColor(r / l, g / l, b / l, 1.f);
117 glClear(GL_COLOR_BUFFER_BIT);
118 glfwSwapBuffers(window);
119
120 glfwWaitEvents();
121
122 if (glfwWindowShouldClose(window))
123 running = GLFW_FALSE;
124 }
125
126 glfwHideWindow(window);
127 thrd_join(thread, &result);
128 glfwDestroyWindow(window);
129
130 glfwTerminate();
131 exit(EXIT_SUCCESS);
132 }
133
134