Linux glClearColor(0, 0, 0, 0) 是透明的，不是黑色的
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glClearColor(0, 0, 0, 0) is transparent, not black
提问by Niklas R
I'm trying to use OpenGL my first time. I was looking at some code online and then tried to write my own, but I always just got an empty (transparent) window. (I used GLUT to open the window).
我第一次尝试使用 OpenGL。我正在网上查看一些代码，然后尝试编写自己的代码，但我总是得到一个空的（透明）窗口。（我使用 GLUT 打开窗口）。
I thought I did something wrong, so I copyied the code from hereto my C source-code, and my window is still transparent. Also, the alphaparameter for glClearColor()does not seem to have any effect. Instead, the alpha-value seemsto be determined by the red, greenand blueparameters.
我以为我做错了什么，所以我将代码从这里复制到我的 C 源代码中，我的窗口仍然是透明的。此外，glClearColor()的alpha参数似乎没有任何效果。相反，alpha 值似乎由red、green和blue参数决定。
glClearColor(0, 0, 0, 0)glClearColor(0, 0, 0, 1)
glClearColor(0, 0, 0, 0)glClearColor(0, 0, 0, 1)
glClearColor(1, 0, 0, 0)glClearColor(1, 0, 0, 1)
glClearColor(1, 0, 0, 0)glClearColor(1, 0, 0, 1)
glClearColor(1, 1, 0, 0)glClearColor(1, 1, 0, 1)
glClearColor(1, 1, 0, 0)glClearColor(1, 1, 0, 1)
glClearColor(1, 0, 0, 0)glClearColor(1, 0, 0, 1)
glClearColor(1, 0, 0, 0)glClearColor(1, 0, 0, 1)
The alphaparameter doesn't change the result.
本阿尔法参数不会改变结果。
I use Ubuntu 12.04 LTS, libgl1-mesa-dev.
我使用 Ubuntu 12.04 LTS, libgl1-mesa-dev。
Is this a bug or do I do something wrong?
这是一个错误还是我做错了什么？
回答by aib
GLUT does not request an alpha buffer by default, and I suspect what you're seeing might be a fail-safe, ad hoc implementation of window transparency. Try adding:
默认情况下，GLUT 不请求 alpha 缓冲区，我怀疑您所看到的可能是窗口透明度的故障安全、临时实现。尝试添加：
glutInitDisplayMode(GLUT_RGBA | GLUT_ALPHA);
near the other GLUT init calls. Keep this functionin mind, as you'll need to modify the call again if/when you want depth or stencil buffers, or double buffering.
在其他 GLUT init 调用附近。请记住此功能，因为如果/当您需要深度或模板缓冲区或双缓冲时，您将需要再次修改调用。
回答by Muhammed Anees V
Use glutInitDisplayMode (GLUT_SINGLE | GLUT_RGB) in display mode
在显示模式下使用 glutInitDisplayMode (GLUT_SINGLE | GLUT_RGB)
