glcolor3b和glcolor3ub之间的区别 [英] Difference between glcolor3b and glcolor3ub

问题描述

我想知道glcolor3b()和glcolor3ub()之间的区别是什么.

I was wondering what the difference is between glcolor3b() and glcolor3ub().

似乎glcolor3b(255, 0, 0);并未将颜色设置为红色，而是将其设置为黑色. glcolor3b(48, 160, 64)将其设置为深紫色，而不是绿色. glcolor3ub()，但是按预期工作.
此外， 和 glcolor3ub() 完全相同，除了"u":

It appears that glcolor3b(255, 0, 0); does not set the color to red, but rather it sets it to black. glcolor3b(48, 160, 64) sets it to dark purple, not green. glcolor3ub(), however works as expected.
Additionally, the documentation for glcolor3b() and glcolor3ub() are exactly the same, except for the "u":

public static void glColor3(u)b(byte red,
              byte green,
              byte blue)

有人知道这是为什么吗?

Does anybody know why this is?

推荐答案

glColor3b()采用字节参数，范围从 -128 到 127 . glColor3ub()采用无符号字节参数，范围从 0 到 255 . 在glColor3b()中使用大于127的值会导致算术溢出.

glColor3b() takes byte parameters with a range from -128 to 127. glColor3ub() takes unsigned byte parameters with a range from 0 to 255. Using values greater than 127 with glColor3b() leads to an arithmetic overflow.

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