void RenderScene()

{

    //清除缓存区

    glClear(GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT|GL_STENCIL_BUFFER_BIT);

    //设置四个固定矩形颜色

    GLfloat vRed[] = {1.0f, 0.0f, 0.0f, 0.5f};

    GLfloat vGreen[] = {0.0f, 1.0f, 0.0f, 1.0f};

    GLfloat vBlue[] = {0.0f, 0.0f, 1.0f, 1.0f};

    GLfloat vBlack[] = {0.0f, 0.0f, 0.0f, 1.0f};

    //绘制四个固定矩形

    //GLT_SHADER_IDENTITY：单元着色器

    shaderManager.UseStockShader(GLT_SHADER_IDENTITY, vRed);

    redBatch.Draw();

    shaderManager.UseStockShader(GLT_SHADER_IDENTITY, vGreen);

    greenBatch.Draw();

    shaderManager.UseStockShader(GLT_SHADER_IDENTITY, vBlue);

    blueBatch.Draw();

    shaderManager.UseStockShader(GLT_SHADER_IDENTITY, vBlack);

    blackBatch.Draw();

    //移动矩形设置混合功能

    //开启混合功能

    glEnable(GL_BLEND);

    //设置混合因子

    glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);

    //使用固定管线着色器

    shaderManager.UseStockShader(GLT_SHADER_IDENTITY, vRed);

    //绘制

    squareBatch.Draw();

    //关闭混合功能

    glDisable(GL_BLEND);

    //后台渲染完成交给前台

    glutSwapBuffers();

}