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Fix version check macros #2973

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merged 1 commit into from
Jul 12, 2022
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haasn
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@haasn haasn commented Jul 12, 2022

These were defined backwards to the usual convention.

#if GLSLANG_VERSION_GREATER_THAN(11, 10, 0)

This reads as "if glslang version is greater than 11.10.0" to any
reasonable sane programmer, and should therefore expand to
"glslang_version > macro_argument".

Yet the check it references was actually written as "macro_argument >
glslang_version", thus expressing the completely opposite condition of
"if glslang version is less than 11.10.0". This is definitely
backwards and extremely, dangerously surprising behavior to any
programmer familiar with such version macros.

I'm not sure if anybody actually ever used them. I certainly didn't, on
account of them being backwards. I could not find a single reference to
them on GitHub (other than in copies of this header) - every project I
found just used the GLSLANG_VERSION_MAJOR etc. macros directly.

These were defined backwards to the usual convention.

 #if GLSLANG_VERSION_GREATER_THAN(11, 10, 0)

This reads as "if glslang version is greater than 11.10.0" to any
reasonable sane programmer, and should therefore expand to
"glslang_version > macro_argument".

Yet the check it references was actually written as "macro_argument >
glslang_version", thus expressing the completely opposite condition of
"if glslang version is *less than* 11.10.0". This is definitely
backwards and extremely, dangerously surprising behavior to any
programmer familiar with such version macros.

I'm not sure if anybody actually ever used them. I certainly didn't, on
account of them being backwards. I could not find a single reference to
them on GitHub (other than in copies of this header) - every project I
found just used the GLSLANG_VERSION_MAJOR etc. macros directly.
@kokoro-team kokoro-team removed the kokoro:run Trigger Google bot runs label Jul 12, 2022
@greg-lunarg greg-lunarg merged commit 68c1880 into KhronosGroup:master Jul 12, 2022
@greg-lunarg
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Thanks for the fix!

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3 participants