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1//========================================================================
2// Empty event 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 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
41static volatile int running = GLFW_TRUE;
42
43static void error_callback(int error, const char* description)
44{
45    fprintf(stderr, "Error: %s\n", description);
46}
47
48static 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
64static 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
70static float nrand(void)
71{
72    return (float) rand() / (float) RAND_MAX;
73}
74
75int 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
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