{"author_name": "GreaseMonkey", "cat": "LD #23", "comments": [], "epoch": 1334905260, "likes": 0, "metadata": {"p_key": "58954", "p_author": "GreaseMonkey", "p_authorkey": "2396", "p_urlkey": "94703", "p_title": "Got some AVX practice in", "p_cat": "LD #23", "p_event": "LD23", "p_time": "1334905260", "p_likes": "0", "p_comments": "0", "p_status": "UPD5", "us_key": "2396", "us_name": "GreaseMonkey", "us_username": "greasemonkey", "event_start": "1334880000", "event_key": "10", "event_name": "LD23"}, "text": "

So I made an incomplete 2d grid caster engine (as in, you can’t actually move around because I cannot be bothered relearning how to do events yet). My use of AVX (read: SSE but better) wasn’t particularly helpful, but being able to code with AVX compiler intrinsics might come in handy for if I make a ridiculously spammy bullet hell shooter.

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So here it is: https://gist.github.com/2427184

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Just look at the code for a bit and read the render_raycast_avx() function. Tell me if it makes any sense. Thanks.

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If you would like to compile this: gcc -mavx -O2 -g sdlavx2cgridcast.c -o sdlavx2cgridcast `sdl-config –cflags –libs`

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The -mavx is important because otherwise there are no compiler intrinsics available, and the -O2 is important because otherwise the AVX compilation is really piss-poor.

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I highly recommend a 64-bit OS for this one.

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", "time": "April 20th, 2012 2:01 am", "title": "Got some AVX practice in"}