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1 (ns com.aurellem.gb-driver
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2 (:import com.aurellem.gb.Gb)
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3 (:import java.io.File)
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4 (:import (java.nio IntBuffer ByteOrder)))
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5
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6 (Gb/loadVBA)
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7
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8 (def yellow-rom-image
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9 (File. "/home/r/proj/pokemon-escape/roms/yellow.gbc"))
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10
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11 (def yellow-save-file
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12 (File. "/home/r/proj/pokemon-escape/roms/yellow.sav"))
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13
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14 (def current-frame (atom 0))
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15
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16 (defn vba-init []
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17 (reset! current-frame 0)
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18 (.delete yellow-save-file)
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19 (Gb/startEmulator (.getCanonicalPath yellow-rom-image)))
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20
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21 (defn shutdown [] (Gb/shutdown))
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22
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23 (defn reset [] (shutdown) (vba-init))
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24
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25 (defn cpu-data [size arr-fn]
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26 (let [store (int-array size)]
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27 (fn []
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28 (arr-fn store)
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29 store)))
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30
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31 (def ram
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32 (cpu-data (Gb/getRAMSize) #(Gb/getRAM %)))
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33
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34 (def rom
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35 (cpu-data (Gb/getROMSize) #(Gb/getROM %)))
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36
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37 (def working-ram
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38 (cpu-data Gb/WRAM_SIZE #(Gb/getWRAM %)))
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39
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40 (def video-ram
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41 (cpu-data Gb/VRAM_SIZE #(Gb/getVRAM %)))
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42
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43 (def registers
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44 (cpu-data Gb/NUM_REGISTERS #(Gb/getRegisters %)))
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45
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46 (def button-code
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47 {;; main buttons
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48 :a 0x0001
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49 :b 0x0002
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50
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51 ;; directional pad
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52 :r 0x0010
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53 :l 0x0020
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54 :u 0x0040
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55 :d 0x0080
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56
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57 ;; meta buttons
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58 :select 0x0004
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59 :start 0x0008
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60
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61 ;; hard reset -- not really a button
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62 :reset 0x0800})
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63
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64 (defn button-mask [buttons]
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65 (reduce bit-or 0x0000 (map button-code buttons)))
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66
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67 (defn buttons [mask]
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68 (loop [buttons []
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69 masks (seq button-code)]
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70 (if (empty? masks) buttons
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71 (let [[button value] (first masks)]
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72 (if (not= 0x0000 (bit-and value mask))
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73 (recur (conj buttons button) (rest masks))
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74 (recur buttons (rest masks)))))))
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75
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76
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77 (defn save-state [] (Gb/saveState))
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78
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79 (def history (atom {}))
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80
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81 (defn goto [frame]
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82 (let [save (@history frame)]
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83 (if (not (nil? save))
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84 (do
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85 (reset! current-frame frame)
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86 (Gb/loadState save))
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87 (println "no backup state"))))
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88
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89 (defn clear-history [] (reset! history {}))
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90
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91 (defn rewind [] (goto (dec @current-frame)))
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92
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93 (defn backup-state [frame]
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94 (swap! history #(assoc % frame (save-state))))
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95
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96 (def ^:dynamic *save-history* true)
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97
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98 (defn advance []
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99 (let [save (save-state)]
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100 (backup-state @current-frame)
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101 (swap! current-frame inc)))
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102
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103 (defn step
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104 ([] (advance) (Gb/step))
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105 ([mask-or-buttons]
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106 (advance)
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107 (if (number? mask-or-buttons)
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108 (Gb/step mask-or-buttons)
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109 (Gb/step (button-mask mask-or-buttons)))))
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110
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111 (defn frame [] @current-frame)
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112
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113
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