Created
September 9, 2021 19:23
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basic GLFW window with opengl context
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| #define GLFW_INCLUDE_NONE | |
| #include <GLFW/glfw3.h> | |
| #include <glad/glad.h> | |
| #include <iostream> | |
| constexpr float R = 0.2f; | |
| constexpr float G = 0.4f; | |
| constexpr float B = 0.9f; | |
| constexpr float A = 1.0f; | |
| void errorCallback(int errorCode, const char *description) | |
| { | |
| std::cerr << "Error(glfw): [" << errorCode << "] " << description << '\n'; | |
| } | |
| void keyCallback(GLFWwindow *window, int key, int scancode, | |
| int action, int mods) | |
| { | |
| if (action == GLFW_PRESS) { | |
| if (key == GLFW_KEY_ESCAPE) | |
| glfwSetWindowShouldClose(window, GL_TRUE); | |
| } | |
| } | |
| void cursorPosCallback(GLFWwindow *window, double xpos, double ypos) | |
| { | |
| } | |
| void buttonCallback(GLFWwindow *window, int button, int action, int mods) | |
| { | |
| } | |
| void scrollCallback(GLFWwindow *window, double xoffset, double yoffset) | |
| { | |
| } | |
| void glfwContext(int width, int height, const char *title) | |
| { | |
| std::cout << "GLFW Window Creation\n"; | |
| glfwSetErrorCallback(errorCallback); | |
| if (!glfwInit()) | |
| { | |
| std::cerr << "glfw: unable to initialize.\n"; | |
| return; | |
| } | |
| glfwWindowHint(GLFW_CONTEXT_VERSION_MAJOR, 3); | |
| glfwWindowHint(GLFW_CONTEXT_VERSION_MINOR, 3); | |
| glfwWindowHint(GLFW_OPENGL_PROFILE, GLFW_OPENGL_CORE_PROFILE); | |
| glfwWindowHint(GLFW_OPENGL_FORWARD_COMPAT, GL_TRUE); | |
| glfwWindowHint(GLFW_VISIBLE, GLFW_FALSE); | |
| glfwWindowHint(GLFW_RESIZABLE, GL_FALSE); | |
| GLFWwindow *window = glfwCreateWindow(width, height, title, nullptr, nullptr); | |
| if (!window) | |
| { | |
| std::cerr << "glfw: failed to create window.\n"; | |
| return; | |
| } | |
| std::cout << "glfw: version " << GLFW_VERSION_MAJOR << '.' | |
| << GLFW_VERSION_MINOR << '.' << GLFW_VERSION_REVISION << '\n'; | |
| glfwSetCursorPosCallback(window, cursorPosCallback); | |
| glfwSetMouseButtonCallback(window, buttonCallback); | |
| glfwSetScrollCallback(window, scrollCallback); | |
| glfwSetKeyCallback(window, keyCallback); | |
| glfwMakeContextCurrent(window); | |
| if (!gladLoadGLLoader((GLADloadproc)glfwGetProcAddress)) | |
| { | |
| std::cerr << "glad: failed to initialize OpenGL.\n"; | |
| return; | |
| } | |
| std::cout << "OpenGL: version " << GLVersion.major << '.' | |
| << GLVersion.minor << '\n'; | |
| glfwSwapInterval(1); | |
| glfwShowWindow(window); | |
| int bufferWidth; | |
| int bufferHeight; | |
| while (!glfwWindowShouldClose(window)) | |
| { | |
| glfwGetFramebufferSize(window, &bufferWidth, &bufferHeight); | |
| glViewport(0, 0, bufferWidth, bufferHeight); | |
| glClearColor(R, G, B, A); | |
| glClear(GL_COLOR_BUFFER_BIT); | |
| glfwSwapBuffers(window); | |
| glfwPollEvents(); | |
| } | |
| glfwDestroyWindow(window); | |
| glfwTerminate(); | |
| glfwSetErrorCallback(nullptr); | |
| } | |
| int main(int argc, char *argv[]) | |
| { | |
| int width = 640; | |
| int height = 480; | |
| const char *title = "Hello World!"; | |
| glfwContext(width, height, title); | |
| return 0; | |
| } |
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