eglCreateWindowSurface范例

eglCreateWindowSurface函数用于创建窗口表面，下面是一个简单的eglCreateWindowSurface函数的范例：

#include <EGL/egl.h>
#include <X11/Xlib.h>
#include <X11/Xutil.h>

int main()
{
    Display *display;
    Window window;
    EGLDisplay eglDisplay;
    EGLConfig eglConfig;
    EGLContext eglContext;
    EGLSurface eglSurface;
    EGLint numConfigs;
    EGLint majorVersion;
    EGLint minorVersion;
    EGLint contextAttribs[] = { EGL_CONTEXT_CLIENT_VERSION, 2, EGL_NONE };
    EGLint configAttribs[] = { EGL_SURFACE_TYPE, EGL_WINDOW_BIT, EGL_RED_SIZE, 8, EGL_GREEN_SIZE, 8, EGL_BLUE_SIZE, 8, EGL_ALPHA_SIZE, 8, EGL_NONE };

    // Open X11 display
    display = XOpenDisplay(NULL);

    // Create X11 window
    window = XCreateSimpleWindow(display, RootWindow(display, DefaultScreen(display)), 0, 0, 640, 480, 0, 0, 0);

    // Initialize EGL display
    eglDisplay = eglGetDisplay(display);
    eglInitialize(eglDisplay, &majorVersion, &minorVersion);

    // Choose EGL config
    eglChooseConfig(eglDisplay, configAttribs, &eglConfig, 1, &numConfigs);

    // Create EGL context
    eglContext = eglCreateContext(eglDisplay, eglConfig, EGL_NO_CONTEXT, contextAttribs);

    // Create EGL window surface
    eglSurface = eglCreateWindowSurface(eglDisplay, eglConfig, window, NULL);

    // Make current
    eglMakeCurrent(eglDisplay, eglSurface, eglSurface, eglContext);

    // Do some rendering here...

    // Swap buffers
    eglSwapBuffers(eglDisplay, eglSurface);

    // Terminate EGL
    eglTerminate(eglDisplay);

    // Close X11 display
    XCloseDisplay(display);

    return 0;
}

这个例子创建了一个640x480的X11窗口，并使用EGL API创建了一个与窗口相关联的渲染表面，然后将渲染上下文与表面绑定，并进行了一些渲染操作，最后交换了前后缓冲区。