在进行纹理映射操作之前设置 GL 颜色有什么作用？
我正在看一本书中的一些示例代码，它通过将场景（以不同的偏移量）重复渲染到屏幕外纹理上，然后使用该纹理在主视图中重复绘制一个四边形并设置一些混合内容，从而创建抖动的抗锯齿效果。
为了“正确”地累积颜色，代码如下设置颜色：
glColor4f(f, f, f, 1);
其中 f 是 1.0/number_of_samples ，然后绑定离屏纹理并渲染它。
由于纹理带有自己的颜色和 alpha 数据，那么提前设置整体“颜色”会达到什么效果（数学上和直观上）？
谢谢。
I am looking at some sample code in a book that creates a jittered antialiasing effect by repeatedly rendering a scene (at different offsets) onto a offscreen texture, then using that texture to repeatedly draw a quad in the main view with some blend stuff set up.
To accumulate the color "correctly", the code is setting the color like so:
glColor4f(f, f, f, 1);
where f is 1.0/number_of_samples, and then binding the offscreen texture and rendering it.
Since textures come with their own color and alpha data, what is the effect (mathematically and intuitively) that setting the overall "color" in advance achieves?
Thanks.
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默认的纹理环境是GL_MODULATE，这意味着顶点颜色（用glColor设置）与纹理颜色相乘。
所以，从数学上来说，确实如此：
希望能解释它。
The default texture environment is GL_MODULATE, this means that the vertex color (set with glColor) is multiplied with the texture color.
So, mathematically, it does:
Hope that explains it.