这段代码解释了什么是混合.就是将前景色与背景色结合得到新颜色的过程
背景色:又叫目标颜色,是已经进入颜色缓冲区的颜色.
前景色:当前渲染命令的颜色,作为结果进入缓冲区,又叫源颜色.
混合有混合方程式,混合方程式有两个混合因子来计算最终的混合颜色.
打开命令:glEnable(GL_BELNDING);//blend:混合
混合因子的设置需要函数glBlendFunc();来实现,他有两个参数,分别是源混合因子和目标混合因子的值
而这两个混合因子有15个预定义的值.(This code explains what is a mix. Is it a process to combine the foreground color with the background color to get the new color
Background color: also called target color, is the color that has entered the color buffer.
Foreground color: the color of the render command currently, as a result into the buffer, also called source color.
Mixing equations and mixing equations have two mixing factors to calculate the final mixing color.
Open command: glEnable(GL_BELNDING);/ / blend: mixed)