| //======================================================================== |
| // Multi-threading test |
| // Copyright (c) Camilla Löwy <elmindreda@glfw.org> |
| // |
| // This software is provided 'as-is', without any express or implied |
| // warranty. In no event will the authors be held liable for any damages |
| // arising from the use of this software. |
| // |
| // Permission is granted to anyone to use this software for any purpose, |
| // including commercial applications, and to alter it and redistribute it |
| // freely, subject to the following restrictions: |
| // |
| // 1. The origin of this software must not be misrepresented; you must not |
| // claim that you wrote the original software. If you use this software |
| // in a product, an acknowledgment in the product documentation would |
| // be appreciated but is not required. |
| // |
| // 2. Altered source versions must be plainly marked as such, and must not |
| // be misrepresented as being the original software. |
| // |
| // 3. This notice may not be removed or altered from any source |
| // distribution. |
| // |
| //======================================================================== |
| // |
| // This test is intended to verify whether the OpenGL context part of |
| // the GLFW API is able to be used from multiple threads |
| // |
| //======================================================================== |
| |
| #include "tinycthread.h" |
| |
| #include <glad/glad.h> |
| #include <GLFW/glfw3.h> |
| |
| #include <stdio.h> |
| #include <stdlib.h> |
| #include <math.h> |
| |
| typedef struct |
| { |
| GLFWwindow* window; |
| const char* title; |
| float r, g, b; |
| thrd_t id; |
| } Thread; |
| |
| static volatile int running = GLFW_TRUE; |
| |
| static void error_callback(int error, const char* description) |
| { |
| fprintf(stderr, "Error: %s\n", description); |
| } |
| |
| static void key_callback(GLFWwindow* window, int key, int scancode, int action, int mods) |
| { |
| if (key == GLFW_KEY_ESCAPE && action == GLFW_PRESS) |
| glfwSetWindowShouldClose(window, GLFW_TRUE); |
| } |
| |
| static int thread_main(void* data) |
| { |
| const Thread* thread = data; |
| |
| glfwMakeContextCurrent(thread->window); |
| glfwSwapInterval(1); |
| |
| while (running) |
| { |
| const float v = (float) fabs(sin(glfwGetTime() * 2.f)); |
| glClearColor(thread->r * v, thread->g * v, thread->b * v, 0.f); |
| |
| glClear(GL_COLOR_BUFFER_BIT); |
| glfwSwapBuffers(thread->window); |
| } |
| |
| glfwMakeContextCurrent(NULL); |
| return 0; |
| } |
| |
| int main(void) |
| { |
| int i, result; |
| Thread threads[] = |
| { |
| { NULL, "Red", 1.f, 0.f, 0.f, 0 }, |
| { NULL, "Green", 0.f, 1.f, 0.f, 0 }, |
| { NULL, "Blue", 0.f, 0.f, 1.f, 0 } |
| }; |
| const int count = sizeof(threads) / sizeof(Thread); |
| |
| glfwSetErrorCallback(error_callback); |
| |
| if (!glfwInit()) |
| exit(EXIT_FAILURE); |
| |
| glfwWindowHint(GLFW_VISIBLE, GLFW_FALSE); |
| |
| for (i = 0; i < count; i++) |
| { |
| threads[i].window = glfwCreateWindow(200, 200, |
| threads[i].title, |
| NULL, NULL); |
| if (!threads[i].window) |
| { |
| glfwTerminate(); |
| exit(EXIT_FAILURE); |
| } |
| |
| glfwSetKeyCallback(threads[i].window, key_callback); |
| |
| glfwSetWindowPos(threads[i].window, 200 + 250 * i, 200); |
| glfwShowWindow(threads[i].window); |
| } |
| |
| glfwMakeContextCurrent(threads[0].window); |
| gladLoadGLLoader((GLADloadproc) glfwGetProcAddress); |
| glfwMakeContextCurrent(NULL); |
| |
| for (i = 0; i < count; i++) |
| { |
| if (thrd_create(&threads[i].id, thread_main, threads + i) != |
| thrd_success) |
| { |
| fprintf(stderr, "Failed to create secondary thread\n"); |
| |
| glfwTerminate(); |
| exit(EXIT_FAILURE); |
| } |
| } |
| |
| while (running) |
| { |
| glfwWaitEvents(); |
| |
| for (i = 0; i < count; i++) |
| { |
| if (glfwWindowShouldClose(threads[i].window)) |
| running = GLFW_FALSE; |
| } |
| } |
| |
| for (i = 0; i < count; i++) |
| glfwHideWindow(threads[i].window); |
| |
| for (i = 0; i < count; i++) |
| thrd_join(threads[i].id, &result); |
| |
| exit(EXIT_SUCCESS); |
| } |
| |