view clojure/com/aurellem/gb_driver.clj @ 127:901ee6b648da

preliminary memory bootstrapping program complete.
author Robert McIntyre <rlm@mit.edu>
date Sat, 17 Mar 2012 03:43:42 -0500
parents bcb5c41626b4
children 718abf3bec8a
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1 (ns com.aurellem.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 ^:dynamic *save-state-cache*
11 (File. "/home/r/proj/pokemon-escape/save-states/"))
13 (def current-state (atom nil))
15 (defn state-cache-file [name]
16 (File. *save-state-cache* (str name ".sav")))
18 (defn write-state!
19 ([^SaveState name]
20 (write-state! @current-state name))
21 ([^SaveState save ^String name]
22 (let [buffer (:data save)
23 bytes (byte-array (.limit buffer))
24 dest (state-cache-file name)]
25 (.get buffer bytes)
26 (FileUtils/writeByteArrayToFile dest bytes)
27 (.rewind buffer)
28 dest)))
30 (defn read-state [name]
31 (let [save (state-cache-file name)]
32 (if (.exists save)
33 (let [buffer (Gb/saveBuffer)
34 bytes (FileUtils/readFileToByteArray save)]
35 (.put buffer bytes)
36 (.flip buffer)
37 (SaveState. buffer)))))
38 ;;;;;;;;;;;;;;;;
40 ;; Gameboy management
41 (Gb/loadVBA)
43 (def yellow-rom-image
44 (File. "/home/r/proj/pokemon-escape/roms/yellow.gbc"))
46 (def yellow-save-file
47 (File. "/home/r/proj/pokemon-escape/roms/yellow.sav"))
49 (def on? (atom nil))
51 (defn shutdown! [] (Gb/shutdown) (reset! on? false))
53 (defn restart! []
54 (shutdown!)
55 (.delete yellow-save-file)
56 (Gb/startEmulator (.getCanonicalPath yellow-rom-image))
57 (reset! on? true))
59 ;;; The first state!
60 (defn gen-root! []
61 (restart!)
62 (let [state (SaveState. (Gb/saveState))]
63 (write-state! state "root" ) state))
65 (defn root []
66 (if (.exists (state-cache-file "root"))
67 (read-state "root")
68 (gen-root!)))
70 ;;;; Press Buttons
72 (def button-code
73 {;; main buttons
74 :a 0x0001
75 :b 0x0002
77 ;; directional pad
78 :r 0x0010
79 :l 0x0020
80 :u 0x0040
81 :d 0x0080
83 ;; meta buttons
84 :select 0x0004
85 :start 0x0008
87 ;; pseudo-buttons
88 :restart 0x0800 ; hard reset
89 :listen -1 ; listen for user input
90 })
92 (defn button-mask [buttons]
93 (reduce bit-or 0x0000 (map button-code buttons)))
95 (defn set-state! [^SaveState state]
96 (assert (:data state) "Not a valid state!")
97 (if (not @on?) (restart!))
98 (if (not= state @current-state)
99 (do
100 (Gb/loadState (:data state))
101 (reset! current-state state))))
103 (defn update-state []
104 (reset! current-state
105 (SaveState. (Gb/saveState))))
107 (defn step
108 ([^SaveState state buttons]
109 (set-state! state)
110 (Gb/step (button-mask buttons))
111 (reset! current-state
112 (SaveState. (Gb/saveState))))
113 ([^SaveState state]
114 (step state [:listen]))
115 ([] (step (if @current-state @current-state (root)))))
117 (defn tick
118 ([] (tick @current-state))
119 ([^SaveState state]
120 (set-state! state)
121 (Gb/tick)
122 (update-state)))
124 (defn play
125 ([^SaveState state n]
126 (try
127 (set-state! state)
128 (dorun (dotimes [_ n]
129 (Thread/sleep 1)
130 (Gb/step)))
131 (finally
132 (update-state))))
133 ([n]
134 (play @current-state n)))
136 (defn continue!
137 ([state]
138 (play state Integer/MAX_VALUE))
139 ([]
140 (continue! @current-state)))
142 (defn play-moves
143 ([moves [prev state]]
144 (set-state! state)
145 (dorun (map (fn [move] (step @current-state move)) moves))
146 [(concat prev moves) @current-state]))
148 ;;;;;;;;;;;
151 ;;;;;;;;;;;;;;; CPU data
153 (defn cpu-data [size arr-fn]
154 (let [store (int-array size)]
155 (fn get-data
156 ([] (get-data @current-state))
157 ([state]
158 (set-state! state) (arr-fn store) store))))
160 (defn write-cpu-data [size store-fn]
161 (fn store-data
162 ([state new-data]
163 (set-state! state)
164 (let [store (int-array new-data)]
165 (assert (= size (count new-data)))
166 (store-fn store)
167 (update-state)))
168 ([new-data]
169 (store-data @current-state new-data))))
172 (def memory
173 (cpu-data Gb/GB_MEMORY #(Gb/getMemory %)))
175 (def ram
176 (cpu-data Gb/RAM_SIZE #(Gb/getRAM %)))
178 (def rom
179 (cpu-data Gb/ROM_SIZE #(Gb/getROM %)))
181 (def working-ram
182 (cpu-data Gb/WRAM_SIZE #(Gb/getWRAM %)))
184 (def video-ram
185 (cpu-data Gb/VRAM_SIZE #(Gb/getVRAM %)))
187 (def registers
188 (cpu-data Gb/NUM_REGISTERS #(Gb/getRegisters %)))
190 (def write-memory!
191 (write-cpu-data Gb/GB_MEMORY #(Gb/writeMemory %)))
193 (def write-registers!
194 (write-cpu-data Gb/NUM_REGISTERS #(Gb/writeRegisters %)))
196 ;;;;; Registers ;;;;;;;;;;;;;;;;;;;;;;;;;;;
198 (defmacro gen-get-set-register [name index]
199 (let [name-bang (symbol (str name "!"))]
200 `(do
201 (defn ~name
202 ~(str "Retrieve the " name " register from state, or "
203 "from @current-state if state is absent.")
204 ([state#]
205 (nth (registers state#) ~index))
206 ([]
207 (~name @current-state)))
208 (defn ~name-bang
209 ~(str "Set the " name " register for state, or "
210 "for @current-state if state is absent.")
211 ([state# new-register#]
212 (set-state! state#)
213 (let [registers# (registers state#)]
214 (aset registers# ~index new-register#)
215 (Gb/writeRegisters registers#)
216 (update-state)))
217 ([new-register#]
218 (~name-bang @current-state new-register#))))))
220 ;; 16 bit registers
221 (gen-get-set-register PC 0)
222 (gen-get-set-register SP 1)
223 (gen-get-set-register AF 2)
224 (gen-get-set-register BC 3)
225 (gen-get-set-register DE 4)
226 (gen-get-set-register HL 5)
227 (gen-get-set-register IFF 6)
229 ;; 8 bit registers
230 (gen-get-set-register DIV 7)
231 (gen-get-set-register TIMA 8)
232 (gen-get-set-register TMA 9)
233 (gen-get-set-register IF 11)
234 (gen-get-set-register LCDC 12)
235 (gen-get-set-register STAT 13)
236 (gen-get-set-register SCY 14)
237 (gen-get-set-register SCX 15)
238 (gen-get-set-register LY 16)
239 (gen-get-set-register DMA 18)
240 (gen-get-set-register WY 19)
241 (gen-get-set-register WX 20)
242 (gen-get-set-register VBK 21)
243 (gen-get-set-register HDMA1 22)
244 (gen-get-set-register HDMA2 23)
245 (gen-get-set-register HDMA3 24)
246 (gen-get-set-register HDMA4 25)
247 (gen-get-set-register HDMA5 26)
248 (gen-get-set-register SVBK 27)
249 (gen-get-set-register IE 28)
251 ;;;;;;;;;;;;;;;
253 (defmacro defn-memo
254 [& forms]
255 (let [fun-name (first forms)]
256 `(do
257 (defn ~@forms)
258 (alter-var-root (var ~fun-name) memoize))))