A fast, easy to use, free, and community supported 2D game engine
I have a question regarding sprite sheets and RAM usage:
Is it better to make a sprite sheet that's just one long horizontal strip or one that's a square?
If it's a square, then chances are there will be "unused" sprite quadrants along the bottom right. I'm just wondering if it's inefficient for the underlying GL if I use a long horizontal strip (for example if the GL code turned my strip into a HUGE, mostly empty square).
the iPhone only supports square textures that are power's of 2, so a 500x40 pixel image will end up as a 512x512 in memory.
Whats odd is that older versions of the os supported non-square textures..
Wow, that's new for me also. I thought power of 2 means 500x40 would end up as 512x64 in memory. Can you please confirm this or I am back to optimizing the sheets again ;-(
Slipster, I hope you're wrong on this. I did some tests and here are my results about OpenGL memory allocated:
Active SDK 3.1:
blank screen: 5025792 bytes (4908 kb)
with sprite 500x40: 5156864 bytes (5036 kb)
difference: 131072 bytes (128 kb)Active SDK 3.0 and 2.2.1:
blank screen: 5074944 bytes (4956 kb)
with sprite 500x40: 5206016 bytes (5084 kb)
difference: 131072 bytes (128 kb)I have os 3.1 on my device. So it looks like texture of 500x40 is treated as 512x64:
512x64x32 = 1048576 bits = 131072 bytes = 128 kb
Looks like there are some differences when you compile for SDK 3.1 and 3.0/2.2.1 (little better memory usage on 3.1), but anyway allocated memory is 128 kb. Can somebody test for os 3.2 because I didn't update yet?
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