view clojure/com/aurellem/gb/gb_driver.clj @ 187:426fce7e609d

successfully captured program counter!
author Robert McIntyre <rlm@mit.edu>
date Thu, 22 Mar 2012 07:36:54 -0500
parents 3a3bb2197b7f
children 893c753f8088
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1 (ns com.aurellem.gb.gb-driver
2 (:import com.aurellem.gb.Gb)
3 (:import java.io.File)
4 (:import org.apache.commons.io.FileUtils)
5 (:import (java.nio IntBuffer ByteOrder)))
7 ;; Savestates
8 (defrecord SaveState [data])
10 (def user-home (File. (System/getProperty "user.home")))
12 (def ^:dynamic *save-state-cache*
13 (File. user-home "proj/vba-clojure/save-states/"))
15 (def current-state (atom nil))
17 (defn state-cache-file [name]
18 (File. *save-state-cache* (str name ".sav")))
20 (defn write-state!
21 ([^SaveState name]
22 (write-state! @current-state name))
23 ([^SaveState save ^String name]
24 (let [buffer (:data save)
25 bytes (byte-array (.limit buffer))
26 dest (state-cache-file name)]
27 (.get buffer bytes)
28 (FileUtils/writeByteArrayToFile dest bytes)
29 (.rewind buffer)
30 dest)))
32 (defn read-state [name]
33 (let [save (state-cache-file name)]
34 (assert (.exists save))
35 (let [buffer (Gb/saveBuffer)
36 bytes (FileUtils/readFileToByteArray save)]
37 (.put buffer bytes)
38 (.flip buffer)
39 (SaveState. buffer))))
40 ;;;;;;;;;;;;;;;;
42 ;; Gameboy management
43 (Gb/loadVBA)
45 (def yellow-rom-image
46 (File. user-home "proj/pokemon-escape/roms/yellow.gbc"))
48 (def yellow-save-file
49 (File. user-home "proj/pokemon-escape/roms/yellow.sav"))
51 (def on? (atom nil))
53 (defn shutdown! [] (Gb/shutdown) (reset! on? false))
55 (defn restart! []
56 (shutdown!)
57 (.delete yellow-save-file)
58 (Gb/startEmulator (.getCanonicalPath yellow-rom-image))
59 (reset! on? true))
61 ;;; The first state!
62 (defn gen-root! []
63 (restart!)
64 (let [state (SaveState. (Gb/saveState))]
65 (write-state! state "root" ) state))
67 (defn root []
68 (if (.exists (state-cache-file "root"))
69 (read-state "root")
70 (gen-root!)))
72 ;;;; Press Buttons
74 (def button-code
75 {;; main buttons
76 :a 0x0001
77 :b 0x0002
79 ;; directional pad
80 :r 0x0010
81 :l 0x0020
82 :u 0x0040
83 :d 0x0080
85 ;; meta buttons
86 :select 0x0004
87 :start 0x0008
89 ;; pseudo-buttons
90 :restart 0x0800 ; hard reset
91 :listen -1 ; listen for user input
92 })
94 (defn button-mask [buttons]
95 (reduce bit-or 0x0000 (map button-code buttons)))
97 (defn set-state! [^SaveState state]
98 (assert (:data state) "Not a valid state!")
99 (if (not @on?) (restart!))
100 (if (not= state @current-state)
101 (do
102 (Gb/loadState (:data state))
103 (reset! current-state state))))
105 (defn update-state []
106 (reset! current-state
107 (SaveState. (Gb/saveState))))
109 (defn step
110 ([^SaveState state buttons]
111 (set-state! state)
112 (Gb/step (button-mask buttons))
113 (reset! current-state
114 (SaveState. (Gb/saveState))))
115 ([^SaveState state]
116 (step state [:listen]))
117 ([] (step (if @current-state @current-state (root)))))
119 (defn tick
120 ([] (tick @current-state))
121 ([^SaveState state]
122 (set-state! state)
123 (Gb/tick)
124 (update-state)))
126 (defn play
127 ([^SaveState state n]
128 (try
129 (set-state! state)
130 (dorun (dotimes [_ n]
131 (Thread/sleep 1)
132 (Gb/step)))
133 (finally
134 (update-state))))
135 ([n]
136 (play @current-state n)))
138 (defn continue!
139 ([state]
140 (play state Integer/MAX_VALUE))
141 ([]
142 (continue! @current-state)))
144 (defn run-moves [state moves]
145 (set-state! state)
146 (dorun (map #(Gb/step (button-mask %))
147 moves))
148 (update-state))
150 (defn play-moves
151 ([moves [prev state]]
152 (set-state! state)
153 (dorun (map (fn [move] (step @current-state move)) moves))
154 [(concat prev moves) @current-state]))
156 ;;;;;;;;;;;
159 ;;;;;;;;;;;;;;; CPU data
161 (defn cpu-data [size arr-fn]
162 (let [store (int-array size)]
163 (fn get-data
164 ([] (get-data @current-state))
165 ([state]
166 (set-state! state) (arr-fn store) store))))
168 (defn write-cpu-data [size store-fn]
169 (fn store-data
170 ([state new-data]
171 (set-state! state)
172 (let [store (int-array new-data)]
173 (assert (= size (count new-data)))
174 (store-fn store)
175 (update-state)))
176 ([new-data]
177 (store-data @current-state new-data))))
180 (def memory
181 (cpu-data Gb/GB_MEMORY #(Gb/getMemory %)))
183 (def ram
184 (cpu-data Gb/RAM_SIZE #(Gb/getRAM %)))
186 (def rom
187 (cpu-data Gb/ROM_SIZE #(Gb/getROM %)))
189 (def working-ram
190 (cpu-data Gb/WRAM_SIZE #(Gb/getWRAM %)))
192 (def video-ram
193 (cpu-data Gb/VRAM_SIZE #(Gb/getVRAM %)))
195 (def registers
196 (cpu-data Gb/NUM_REGISTERS #(Gb/getRegisters %)))
198 (def write-memory!
199 (write-cpu-data Gb/GB_MEMORY #(Gb/writeMemory %)))
201 (def write-registers!
202 (write-cpu-data Gb/NUM_REGISTERS #(Gb/writeRegisters %)))
204 ;;;;; Registers ;;;;;;;;;;;;;;;;;;;;;;;;;;;
206 (defmacro gen-get-set-register [name index]
207 (let [name-bang (symbol (str name "!"))]
208 `(do
209 (defn ~name
210 ~(str "Retrieve the " name " register from state, or "
211 "from @current-state if state is absent.")
212 ([state#]
213 (nth (registers state#) ~index))
214 ([]
215 (~name @current-state)))
216 (defn ~name-bang
217 ~(str "Set the " name " register for state, or "
218 "for @current-state if state is absent.")
219 ([state# new-register#]
220 (set-state! state#)
221 (let [registers# (registers state#)]
222 (aset registers# ~index new-register#)
223 (Gb/writeRegisters registers#)
224 (update-state)))
225 ([new-register#]
226 (~name-bang @current-state new-register#))))))
228 ;; 16 bit registers
229 (gen-get-set-register PC 0)
230 (gen-get-set-register SP 1)
231 (gen-get-set-register AF 2)
232 (gen-get-set-register BC 3)
233 (gen-get-set-register DE 4)
234 (gen-get-set-register HL 5)
235 (gen-get-set-register IFF 6)
237 ;; 8 bit registers
238 (gen-get-set-register DIV 7)
239 (gen-get-set-register TIMA 8)
240 (gen-get-set-register TMA 9)
241 (gen-get-set-register IF 11)
242 (gen-get-set-register LCDC 12)
243 (gen-get-set-register STAT 13)
244 (gen-get-set-register SCY 14)
245 (gen-get-set-register SCX 15)
246 (gen-get-set-register LY 16)
247 (gen-get-set-register DMA 18)
248 (gen-get-set-register WY 19)
249 (gen-get-set-register WX 20)
250 (gen-get-set-register VBK 21)
251 (gen-get-set-register HDMA1 22)
252 (gen-get-set-register HDMA2 23)
253 (gen-get-set-register HDMA3 24)
254 (gen-get-set-register HDMA4 25)
255 (gen-get-set-register HDMA5 26)
256 (gen-get-set-register SVBK 27)
257 (gen-get-set-register IE 28)
259 ;;;;;;;;;;;;;;;
261 (defmacro defn-memo
262 [& forms]
263 (let [fun-name (first forms)]
264 `(do
265 (defn ~@forms)
266 (alter-var-root (var ~fun-name) memoize))))