OpenGL仅绘制背景，不会显示黄点。我想用glBegin和glEnd来画它。坐标是变量，因为我想稍后移动那个点。大部分代码只是GLFW初始化，我担心的是draw_player函数，因为那里包含了DRAW调用。我偶然发现的修复方法是使用GL_POINTS而不是GL_POINT(在glBegin中作为参数)，但没有帮助(尽管我继续使用它)。

# include <GLFW/glfw3.h>

//#include <stdio.h>

//coordinates
int px, py;

//My not working function
void draw_player()
{
    glColor3f(1.0f, 1.0f, 0);
    glPointSize(64.0f);
    glBegin(GL_POINTS);
    glVertex2i(px, py);
    glEnd();
}

int main(int argc, char* argv[])
{
    GLFWwindow* window;

    if (!glfwInit())
        return -1;

    window = glfwCreateWindow(910, 512, "Raycast", NULL, NULL);
    if (!window)
    {
        glfwTerminate();
        return -1;
    }

    glfwMakeContextCurrent(window);

    glClearColor(0.1f, 0.1f, 0.5f, 1.0f);
    //setting the coordinates
    px = 100;
    py = 10;

    while (!glfwWindowShouldClose(window))
    {
        /* Render here */
        glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);

        draw_player();

        /* Swap front and back buffers */
        glfwSwapBuffers(window);

        /* Poll for and process events */
        glfwPollEvents();
    }

    glfwTerminate();
    return 0;
}