GLFW入门教程02.02：空白界面

目的

显示一个最基本的窗口界面。

源码

#include <stdio.h>
#include <GLFW/glfw3.h>

static void glfw_error_callback(int error, const char* description)
{
    fprintf(stderr, "Glfw Error %d: %s\n", error, description);
}

int main(int, char**)
{
    // Setup window
    glfwSetErrorCallback(glfw_error_callback);
    if (!glfwInit())
        return 1;

    GLFWwindow* window = glfwCreateWindow(1280, 720, "GLFW Window", NULL, NULL);
    if (window == NULL)
        return 1;

    glfwMakeContextCurrent(window);
    glfwSwapInterval(1); // Enable vsync

    // Main loop
    while (!glfwWindowShouldClose(window))
    {
        // Poll and handle events (inputs, window resize, etc.)
        glfwPollEvents();

        int display_w, display_h;
        glfwGetFramebufferSize(window, &display_w, &display_h);
        glViewport(0, 0, display_w, display_h);
        glClearColor(0.0f, 0.0f, 0.0f, 1.0f);
        glClear(GL_COLOR_BUFFER_BIT);
        
        //display func

        glfwMakeContextCurrent(window);
        glfwSwapBuffers(window);
    }

    glfwDestroyWindow(window);
    glfwTerminate();

    return 0;
}

此代码将作为后续开发的模板。

主要流程为

flowchart TB

A(Start) --> B[初始化]
B --> C[创建窗口]
C --> D[上下文设置]
D --> E[显示循环]
E --> F[释放资源]
F --> G(End)

函数调用图为

flowchart TB

A(Start) --> B[glfwInit]
B --> C[glfwCreateWindow]
C --> D[glfwMakeContextCurrent]
D --> E{glfwWindowShouldClose}
E --No--> F[glfwPollEvents]
F --> G[glfwGetFramebufferSize]
G --> H[glViewport]
H --> I[glClearColor]
I --> J[glClear]
J --> L[glfwMakeContextCurrent]
L --> M[glfwSwapBuffers]
M --> E
E --Yes--> O[glfwDestroyWindow]
O --> P[glfwTerminate]
P --> Q(End)

编译

all:
	gcc main.c -o window -lglfw -lGL

结果