OpenGL：我应该自己剪辑glColor * f值吗？ [英] OpenGL: Should i always clip the glColor*f values myself?

问题描述

这可能听起来很蠢...但我一直在想，如果我发送一个大于1.0f的值到glColor * f函数是否重要？

This may sound stupid... but I've been wondering, does it matter if i send a value greater than 1.0f to the glColor*f functions?

旧gfx卡/驱动程序处理这些不同？ OpenGL直接使用我给它的颜色值，还是它自己剪辑？我应该停止做if（r> 1.0f）r = 1.0f; ？是否有任何危险，大于1.0f会导致未指定的行为？

Does older gfx cards/drivers handle these differently? Does OpenGL directly use the color value i give to it, or does it clip it on its own? Should i stop doing if(r > 1.0f) r = 1.0f; ? Is there any danger the greater than 1.0f would result in unexpeceted behaviour?

我似乎没有大于1.0f做任何不同的事情。

I cant seem to get greater than 1.0f to do anything different.

推荐答案

从联机帮助页：

在更新当前颜色之前，浮点数或有符号整数值都不会被锁定到范围[0,1]在它们被内插或写入颜色缓冲器之前被钳位到该范围。

"Neither floating-point nor signed integer values are clamped to the range [0,1] before the current color is updated. However, color components are clamped to this range before they are interpolated or written into a color buffer."

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