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27 lines
793 B
Plaintext
27 lines
793 B
Plaintext
(module
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(import "env" "memory" (memory 4))
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(func (export "upd")
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(local $i i32) ;; local variables are zero initialized
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(loop $pixels
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local.get $i ;; pixel index to write to
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(i32.rem_u (local.get $i) (i32.const 320)) ;; x
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(i32.div_u (i32.load (i32.const 64)) (i32.const 10)) ;; time / 10
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i32.add
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(i32.div_u (local.get $i) (i32.const 320)) ;; y
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i32.xor ;; (x + time / 10) ^ y
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(i32.shr_u (i32.const 3)) ;; .. >> 3
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(i32.and (i32.const 127)) ;; .. & 127
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i32.store8 offset=120 ;; store at pixel index + 120
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(i32.add (local.get $i) (i32.const 1)) ;; i + 1
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local.tee $i ;; write it back but keep it on the stack
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(br_if $pixels (i32.lt_s (i32.const 76800))) ;; branch to start of loop if i < 320*240
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)
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)
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)
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