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initial(opengl_demos)

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flykhan 2024-05-21 20:15:42 +08:00
commit 28a45d6ec5
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#include <glad/glad.h>
#include <GLFW/glfw3.h>
#include <iostream>
void framebuffer_size_callback(GLFWwindow* window, int width, int height);
void processInput(GLFWwindow* window);
// settings
const unsigned int SCR_WIDTH = 800;
const unsigned int SCR_HEIGHT = 600;
int main()
{
// 初始化 GLFW
glfwInit();
// 配置 GLFW : 版本 3.3 ,使用 Core-profile 模式
glfwWindowHint(GLFW_CONTEXT_VERSION_MAJOR, 3);
glfwWindowHint(GLFW_CONTEXT_VERSION_MINOR, 3);
glfwWindowHint(GLFW_OPENGL_PROFILE, GLFW_OPENGL_CORE_PROFILE);
// MACOS 平台需要启用这一条
#ifdef _APPLE_
glfwWindowHint(GLFW_OPENGL_FORWARD_COMPAT, GL_TRUE);
#endif // _APPLE_
// 创建窗口对象
GLFWwindow* window = glfwCreateWindow(SCR_WIDTH, SCR_HEIGHT, "LearnOpenGL", NULL, NULL);
if (window == NULL)
{
std::cout << "Failed to create GLFW window" << std::endl;
glfwTerminate();
return -1;
}
glfwMakeContextCurrent(window);
// 注册帧缓冲变化时的回调函数
glfwSetFramebufferSizeCallback(window, framebuffer_size_callback);
// 初始化 GLAD : load all OpenGL function pointers
if (!gladLoadGLLoader((GLADloadproc)glfwGetProcAddress))
{
std::cout << "Failed to initialize GLAD" << std::endl;
return -1;
}
// 渲染循环 (Render Loop)
while (!glfwWindowShouldClose(window))
{
// input
processInput(window);
// 渲染指令
glClearColor(0.2f, 0.3f, 0.3f, 1.0f); // 状态设置函数
glClear(GL_COLOR_BUFFER_BIT); // 状态使用函数
// glfw: swap buffers and poll IO events (keys pressed/released, mouse moved etc.)
glfwSwapBuffers(window);
glfwPollEvents();
}
// glfw: terminate, clearing all previously allocated GLFW resources
glfwTerminate();
return 0;
}
// 窗口大小改变时的回调函数
void framebuffer_size_callback(GLFWwindow* window, int width, int height)
{
// 视口
glViewport(0, 0, width, height);
}
// process all input: query GLFW whether relevant keys are pressed/released this frame and react accordingly
void processInput(GLFWwindow* window)
{
if (glfwGetKey(window, GLFW_KEY_ESCAPE) == GLFW_PRESS)
glfwSetWindowShouldClose(window, true);
}

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