C++/SDL "fog of war" effect

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5 Replies - 1789 Views - Last Post: 08 January 2013 - 08:27 AM Rate Topic: -----

#1 PastaPojken  Icon User is offline

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C++/SDL "fog of war" effect

Posted 04 January 2013 - 03:29 PM

Hi everyone!

I'm trying to create something like a "fog of war" effect but I don't really know how to do it...
I've found this: http://stackoverflow...cles-fog-of-war
but I don't really understand it. Thanks for any help or suggestion ^^

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#2 modi123_1  Icon User is online

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Re: C++/SDL "fog of war" effect

Posted 04 January 2013 - 03:38 PM

So.. what do you want people to help you with?
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#3 PastaPojken  Icon User is offline

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Re: C++/SDL "fog of war" effect

Posted 04 January 2013 - 03:44 PM

View Postmodi123_1, on 04 January 2013 - 03:38 PM, said:

So.. what do you want people to help you with?


Sorry if I wasn't clear, I would really appreciate if someone could give me any hints or maybe explain in a more clearly way what the guy in the link is doing :)
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#4 jimblumberg  Icon User is online

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Re: C++/SDL "fog of war" effect

Posted 04 January 2013 - 04:17 PM

I suggest asking a question in that forum.

Jim
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#5 #define  Icon User is offline

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Re: C++/SDL "fog of war" effect

Posted 07 January 2013 - 12:05 PM

The poster is using the alpha channel at pixel-level. SDL can use surface-level alpha and pixel-level alpha.

Here is a surface level tutorial to give you an idea.

Alpha Blending
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#6 PastaPojken  Icon User is offline

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Re: C++/SDL "fog of war" effect

Posted 08 January 2013 - 08:27 AM

View Post#define, on 07 January 2013 - 12:05 PM, said:

The poster is using the alpha channel at pixel-level. SDL can use surface-level alpha and pixel-level alpha.

Here is a surface level tutorial to give you an idea.

Alpha Blending


Thank you!!! :D That really helps! :)
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