view clojure/com/aurellem/vbm.clj @ 78:4a1b17917fc8

speed up emulation
author Robert McIntyre <rlm@mit.edu>
date Thu, 08 Mar 2012 21:50:46 -0600
parents 8a895ed4c0f9
children e8855121f413
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line source
1 (ns com.aurellem.vbm
2 (:import java.io.File)
3 (:import org.apache.commons.io.FileUtils)
4 (:use com.aurellem.gb-driver))
6 (defn vbm-bytes [#^File vbm]
7 (let [bytes (FileUtils/readFileToByteArray vbm)
8 ints (int-array (count bytes))]
9 (areduce bytes idx _ nil
10 (aset ints idx
11 (bit-and 0xFF (aget bytes idx))))
12 ints))
14 (def vbm-header-length 255)
16 (defn repair-vbm
17 "Two 0's must be inserted after every reset."
18 [vbm-masks]
19 (loop [fixed []
20 pending vbm-masks]
21 (if (empty? pending) fixed
22 (let [mask (first pending)]
23 (if (not= 0x0000 (bit-and mask (button-code :reset)))
24 (recur (conj fixed mask 0x0000 0x0000) (next pending))
25 (recur (conj fixed mask) (next pending)))))))
27 (defn vbm-masks [#^File vbm]
28 (repair-vbm
29 (map (fn [[a b]]
30 (+ (bit-shift-left a 8) b))
31 (partition
32 2 (drop vbm-header-length (vbm-bytes vbm))))))
34 (defn vbm-buttons [#^File vbm]
35 (map buttons (vbm-masks vbm)))
37 (defn play-vbm [#^File vbm]
38 (reset)
39 (dorun (map step (vbm-masks vbm))))
41 (defn convert-buttons
42 "To write a vbm file, we must remove the last two buttons after any
43 reset event."
44 [buttons]
45 (loop [fixed []
46 pending buttons]
47 (if (empty? pending) fixed
48 (let [mask (first pending)]
49 (if (contains? (set (first pending)) :reset)
50 (recur (conj fixed mask) (drop 3 pending))
51 (recur (conj fixed mask) (next pending)))))))
53 (def vbm-header
54 (byte-array
55 (map
56 byte
57 [86 66 77 26 1 0 0 0 105 74 88 79 89 1 0 0 0 0 0 0 0 1 2 112 0 0 0
58 0 0 0 0 0 1 0 0 0 80 79 75 69 77 79 78 32 89 69 76 76 1 -105 124 4
59 3 0 0 0 0 0 0 0 0 1 0 0 95 95 95 95 95 95 95 95 95 95 95 95 95 95
60 95 95 82 111 98 101 114 116 32 32 77 99 73 110 116 121 114 101 95
61 95 95 95 95 95 95 95 95 95 95 95 95 95 95 95 95 95 95 95 95 95 95
62 95 95 95 95 95 95 95 95 95 95 95 95 95 95 95 95 95 95 95 95 95 95
63 95 95 95 95 95 95 95 95 95 95 95 95 95 95 95 95 95 95 95 95 95 95
64 95 95 95 95 95 95 95 95 95 95 95 95 95 95 95 95 95 95 95 95 95 95
65 95 95 95 95 95 95 95 95 95 95 95 95 95 95 95 95 95 95 95 95 95 95
66 95 95 95 95 95 95 95 95 95 95 95 95 95 95 95 95 95 95 95 95 95 95
67 95 95 95 95 95 95 95 95 95 95 95 95 95 95 95 95 95 95 95 95 95 95
68 95 95 95 95])))
70 (def vbm-trailer
71 (byte-array
72 (map byte [0])))
74 (defn buttons->vbm-bytes [buttons]
75 (let [bytes-in-ints
76 (map button-mask (convert-buttons buttons))
77 high-bits (map #(bit-shift-right (bit-and 0xFF00 %) 8)
78 bytes-in-ints)
79 low-bits (map #(bit-and 0xFF %) bytes-in-ints)
80 convert-byte (fn [i] (byte (if (>= i 128) (- i 256) i)))
81 contents
82 (byte-array
83 (concat
84 vbm-header
85 (map convert-byte (interleave high-bits low-bits))
86 vbm-trailer))]
87 contents))
89 (defn write-vbm [buttons #^File out]
90 (clojure.java.io/copy (buttons->vbm-bytes buttons) out))