mirror of
https://github.com/uffejakobsen/acme.git
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0ec58e8b15
git-svn-id: https://svn.code.sf.net/p/acme-crossass/code-0/trunk@12 4df02467-bbd4-4a76-a152-e7ce94205b78
38 lines
1.1 KiB
Plaintext
38 lines
1.1 KiB
Plaintext
;ACME 0.93
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!to "trigono.o", plain
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* = $c000
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PI = 3.14159265358979323846
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!raw "cos[0,pi/2] scaled to 0-255 range"
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!align $f, 0, 0 ; make output file look better in hex editor :)
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!for x, 256 {
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!byte cos(float(x - 1) / 255 * PI/2) * 255 + 0.5
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}
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; "x-1" converts interval [1,256] to interval [0,255]
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; "float()" makes sure this calculation is done in float mode now
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; "/255*half_PI" converts interval [0,255] to interval [0,PI/2]
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; "cos()" returns cosine. Wow.
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; "*255" converts interval [0,1] to interval [0,255]
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; "+0.5" ensures correct rounding to integer
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!align $f, 0, 0
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!raw "sin[-pi/2,pi/2] scaled to full range of 16b.16b fixed point"
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!align $f, 0, 0
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!for x, 1024 {
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!32 sin(float(x - 513) / 1024 * PI) * 65536 + 0.5
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}
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;undefined = 0.0 / 0.0 ; throws error when active
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;range = arcsin(-10) ; throws error when active
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!by 1 / 2 * 2 ; should give 0
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!by 1 / 2 * 2.0 ; should give 0
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!by 1 / 2.0 * 2 ; should give 1
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!by 1 / 2.0 * 2.0 ; should give 1
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!by 1.0 / 2 * 2 ; should give 1
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!by 1.0 / 2 * 2.0 ; should give 1
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!by 1.0 / 2.0 * 2 ; should give 1
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!by 1.0 / 2.0 * 2.0 ; should give 1
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