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1//========================================================================
2// Multi-threading 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 whether the OpenGL context part of
27// the GLFW API is able to be used from multiple threads
28//
29//========================================================================
30
31#include "tinycthread.h"
32
33#define GLAD_GL_IMPLEMENTATION
34#include <glad/gl.h>
35#define GLFW_INCLUDE_NONE
36#include <GLFW/glfw3.h>
37
38#include <stdio.h>
39#include <stdlib.h>
40#include <math.h>
41
42typedef struct
43{
44    GLFWwindow* window;
45    const char* title;
46    float r, g, b;
47    thrd_t id;
48} Thread;
49
50static volatile int running = GLFW_TRUE;
51
52static void error_callback(int error, const char* description)
53{
54    fprintf(stderr, "Error: %s\n", description);
55}
56
57static void key_callback(GLFWwindow* window, int key, int scancode, int action, int mods)
58{
59    if (key == GLFW_KEY_ESCAPE && action == GLFW_PRESS)
60        glfwSetWindowShouldClose(window, GLFW_TRUE);
61}
62
63static int thread_main(void* data)
64{
65    const Thread* thread = data;
66
67    glfwMakeContextCurrent(thread->window);
68    glfwSwapInterval(1);
69
70    while (running)
71    {
72        const float v = (float) fabs(sin(glfwGetTime() * 2.f));
73        glClearColor(thread->r * v, thread->g * v, thread->b * v, 0.f);
74
75        glClear(GL_COLOR_BUFFER_BIT);
76        glfwSwapBuffers(thread->window);
77    }
78
79    glfwMakeContextCurrent(NULL);
80    return 0;
81}
82
83int main(void)
84{
85    int i, result;
86    Thread threads[] =
87    {
88        { NULL, "Red", 1.f, 0.f, 0.f, 0 },
89        { NULL, "Green", 0.f, 1.f, 0.f, 0 },
90        { NULL, "Blue", 0.f, 0.f, 1.f, 0 }
91    };
92    const int count = sizeof(threads) / sizeof(Thread);
93
94    glfwSetErrorCallback(error_callback);
95
96    if (!glfwInit())
97        exit(EXIT_FAILURE);
98
99    for (i = 0;  i < count;  i++)
100    {
101        glfwWindowHint(GLFW_POSITION_X, 200 + 250 * i);
102        glfwWindowHint(GLFW_POSITION_Y, 200);
103
104        threads[i].window = glfwCreateWindow(200, 200,
105                                             threads[i].title,
106                                             NULL, NULL);
107        if (!threads[i].window)
108        {
109            glfwTerminate();
110            exit(EXIT_FAILURE);
111        }
112
113        glfwSetKeyCallback(threads[i].window, key_callback);
114    }
115
116    glfwMakeContextCurrent(threads[0].window);
117    gladLoadGL(glfwGetProcAddress);
118    glfwMakeContextCurrent(NULL);
119
120    for (i = 0;  i < count;  i++)
121    {
122        if (thrd_create(&threads[i].id, thread_main, threads + i) !=
123            thrd_success)
124        {
125            fprintf(stderr, "Failed to create secondary thread\n");
126
127            glfwTerminate();
128            exit(EXIT_FAILURE);
129        }
130    }
131
132    while (running)
133    {
134        glfwWaitEvents();
135
136        for (i = 0;  i < count;  i++)
137        {
138            if (glfwWindowShouldClose(threads[i].window))
139                running = GLFW_FALSE;
140        }
141    }
142
143    for (i = 0;  i < count;  i++)
144        glfwHideWindow(threads[i].window);
145
146    for (i = 0;  i < count;  i++)
147        thrd_join(threads[i].id, &result);
148
149    exit(EXIT_SUCCESS);
150}
151
152
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