rlm@145: (ns com.aurellem.gb.gb-driver
rlm@145:     (:import com.aurellem.gb.Gb)
rlm@145:     (:import java.io.File)
rlm@145:     (:import org.apache.commons.io.FileUtils)
rlm@145:     (:import (java.nio IntBuffer ByteOrder)))
rlm@145: 
rlm@145: ;; Savestates
rlm@145: (defrecord SaveState [data])
rlm@145: 
rlm@145: (def user-home (File. (System/getProperty "user.home")))
rlm@145: 
rlm@145: (def ^:dynamic *save-state-cache*
rlm@145:   (File. user-home "proj/vba-clojure/save-states/"))
rlm@145: 
rlm@145: (def current-state (atom nil))
rlm@145: 
rlm@145: (defn state-cache-file [name]
rlm@145:   (File. *save-state-cache* (str name ".sav")))
rlm@145: 
rlm@145: (defn write-state!
rlm@145:   ([^SaveState name]
rlm@145:      (write-state! @current-state name))
rlm@145:   ([^SaveState save ^String name]
rlm@145:      (let [buffer (:data save)
rlm@145:            bytes (byte-array (.limit buffer))
rlm@145:            dest (state-cache-file name)]
rlm@145:        (.get buffer bytes)
rlm@145:        (FileUtils/writeByteArrayToFile dest bytes)
rlm@145:        (.rewind buffer)
rlm@145:        dest)))
rlm@145: 
rlm@145: (defn read-state [name]
rlm@145:   (let [save (state-cache-file name)]
rlm@145:     (if (.exists save)
rlm@145:       (let [buffer (Gb/saveBuffer)
rlm@145:             bytes (FileUtils/readFileToByteArray save)]
rlm@145:         (.put buffer bytes)
rlm@145:         (.flip buffer)
rlm@145:         (SaveState. buffer)))))
rlm@145: ;;;;;;;;;;;;;;;;
rlm@145: 
rlm@145: ;; Gameboy management
rlm@145: (Gb/loadVBA)
rlm@145: 
rlm@145: (def yellow-rom-image
rlm@145:   (File. user-home "proj/pokemon-escape/roms/yellow.gbc"))
rlm@145: 
rlm@145: (def yellow-save-file
rlm@145:   (File. user-home "proj/pokemon-escape/roms/yellow.sav"))
rlm@145: 
rlm@145: (def on? (atom nil))
rlm@145: 
rlm@145: (defn shutdown! [] (Gb/shutdown) (reset! on? false))
rlm@145: 
rlm@145: (defn restart! []
rlm@145:   (shutdown!)
rlm@145:   (.delete yellow-save-file)
rlm@145:   (Gb/startEmulator (.getCanonicalPath yellow-rom-image))
rlm@145:   (reset! on? true))
rlm@145: 
rlm@145: ;;; The first state!
rlm@145: (defn gen-root! []
rlm@145:   (restart!)
rlm@145:   (let [state (SaveState. (Gb/saveState))]
rlm@145:     (write-state! state "root" ) state))
rlm@145: 
rlm@145: (defn root []
rlm@145:   (if (.exists (state-cache-file "root"))
rlm@145:     (read-state "root")
rlm@145:     (gen-root!)))
rlm@145: 
rlm@145: ;;;; Press Buttons
rlm@145: 
rlm@145: (def button-code
rlm@145:   {;; main buttons
rlm@145:    :a         0x0001
rlm@145:    :b         0x0002
rlm@145: 
rlm@145:    ;; directional pad
rlm@145:    :r         0x0010
rlm@145:    :l         0x0020
rlm@145:    :u         0x0040
rlm@145:    :d         0x0080
rlm@145: 
rlm@145:    ;; meta buttons
rlm@145:    :select    0x0004
rlm@145:    :start     0x0008
rlm@145: 
rlm@145:    ;; pseudo-buttons
rlm@145:    :restart   0x0800 ; hard reset 
rlm@145:    :listen -1        ; listen for user input
rlm@145:    })
rlm@145: 
rlm@145: (defn button-mask [buttons]
rlm@145:   (reduce bit-or 0x0000 (map button-code buttons)))
rlm@145: 
rlm@145: (defn set-state! [^SaveState state]
rlm@145:   (assert (:data state) "Not a valid state!")
rlm@145:   (if (not @on?) (restart!))
rlm@145:   (if (not= state @current-state)
rlm@145:     (do 
rlm@145:       (Gb/loadState (:data state))
rlm@145:       (reset! current-state state))))
rlm@145: 
rlm@145: (defn update-state []
rlm@145:   (reset! current-state
rlm@145:           (SaveState. (Gb/saveState))))
rlm@145: 
rlm@145: (defn step
rlm@145:   ([^SaveState state buttons]
rlm@145:      (set-state! state)
rlm@145:      (Gb/step (button-mask buttons))
rlm@145:      (reset! current-state 
rlm@145:              (SaveState. (Gb/saveState))))
rlm@145:   ([^SaveState state]
rlm@145:      (step state [:listen]))
rlm@145:   ([] (step (if @current-state @current-state (root)))))
rlm@145: 
rlm@145: (defn tick
rlm@145:   ([] (tick @current-state))
rlm@145:   ([^SaveState state]
rlm@145:      (set-state! state)
rlm@145:      (Gb/tick)
rlm@145:      (update-state)))
rlm@145: 
rlm@145: (defn play
rlm@145:   ([^SaveState state n]
rlm@145:      (try
rlm@145:        (set-state! state)
rlm@145:        (dorun (dotimes [_ n]
rlm@145:                 (Thread/sleep 1)
rlm@145:                 (Gb/step)))
rlm@145:        (finally
rlm@145:              (update-state))))
rlm@145:   ([n]
rlm@145:      (play @current-state n)))
rlm@145: 
rlm@145: (defn continue!
rlm@145:   ([state]
rlm@145:      (play state Integer/MAX_VALUE))
rlm@145:   ([]
rlm@145:     (continue! @current-state)))
rlm@145: 
rlm@145: (defn play-moves
rlm@145:   ([moves [prev state]]
rlm@145:      (set-state! state)
rlm@145:      (dorun (map (fn [move] (step @current-state move)) moves))
rlm@145:      [(concat prev moves) @current-state]))
rlm@145:   
rlm@145: ;;;;;;;;;;;
rlm@145: 
rlm@145: 
rlm@145: ;;;;;;;;;;;;;;; CPU data
rlm@145: 
rlm@145: (defn cpu-data [size arr-fn]
rlm@145:   (let [store (int-array size)]
rlm@145:     (fn get-data
rlm@145:       ([] (get-data @current-state))
rlm@145:       ([state]
rlm@145:          (set-state! state) (arr-fn store) store))))
rlm@145: 
rlm@145: (defn write-cpu-data [size store-fn]
rlm@145:   (fn store-data
rlm@145:     ([state new-data]
rlm@145:        (set-state! state)
rlm@145:        (let [store (int-array new-data)]
rlm@145:          (assert (= size (count new-data)))
rlm@145:          (store-fn store)
rlm@145:          (update-state)))
rlm@145:     ([new-data]
rlm@145:        (store-data @current-state new-data))))
rlm@145:     
rlm@145: 
rlm@145: (def memory
rlm@145:   (cpu-data Gb/GB_MEMORY #(Gb/getMemory %)))
rlm@145: 
rlm@145: (def ram
rlm@145:   (cpu-data Gb/RAM_SIZE #(Gb/getRAM %)))
rlm@145: 
rlm@145: (def rom 
rlm@145:   (cpu-data Gb/ROM_SIZE #(Gb/getROM %)))
rlm@145: 
rlm@145: (def working-ram 
rlm@145:   (cpu-data Gb/WRAM_SIZE #(Gb/getWRAM %)))
rlm@145: 
rlm@145: (def video-ram 
rlm@145:   (cpu-data Gb/VRAM_SIZE #(Gb/getVRAM %)))
rlm@145: 
rlm@145: (def registers
rlm@145:   (cpu-data Gb/NUM_REGISTERS #(Gb/getRegisters %)))
rlm@145: 
rlm@145: (def write-memory!
rlm@145:   (write-cpu-data Gb/GB_MEMORY #(Gb/writeMemory %)))
rlm@145: 
rlm@145: (def write-registers!
rlm@145:   (write-cpu-data Gb/NUM_REGISTERS #(Gb/writeRegisters %)))
rlm@145: 
rlm@145: ;;;;;  Registers  ;;;;;;;;;;;;;;;;;;;;;;;;;;;
rlm@145: 
rlm@145: (defmacro gen-get-set-register [name index]
rlm@145:   (let [name-bang (symbol (str name "!"))]
rlm@145:     `(do
rlm@145:        (defn ~name
rlm@145:          ~(str "Retrieve the " name " register from state, or "
rlm@145:                "from @current-state if state is absent.")
rlm@145:          ([state#]
rlm@145:             (nth (registers state#) ~index))
rlm@145:          ([]
rlm@145:             (~name @current-state)))
rlm@145:        (defn ~name-bang
rlm@145:          ~(str "Set the " name " register for state, or "
rlm@145:                "for @current-state if state is absent.")
rlm@145:          ([state# new-register#]
rlm@145:             (set-state! state#)
rlm@145:             (let [registers# (registers state#)]
rlm@145:               (aset registers# ~index new-register#)
rlm@145:               (Gb/writeRegisters registers#)
rlm@145:               (update-state)))
rlm@145:          ([new-register#]
rlm@145:             (~name-bang @current-state new-register#))))))
rlm@145: 
rlm@145: ;; 16 bit registers
rlm@145: (gen-get-set-register PC 0)
rlm@145: (gen-get-set-register SP 1)
rlm@145: (gen-get-set-register AF 2)
rlm@145: (gen-get-set-register BC 3)
rlm@145: (gen-get-set-register DE 4)
rlm@145: (gen-get-set-register HL 5)
rlm@145: (gen-get-set-register IFF 6)
rlm@145: 
rlm@145: ;; 8 bit registers
rlm@145: (gen-get-set-register DIV 7)
rlm@145: (gen-get-set-register TIMA 8)
rlm@145: (gen-get-set-register TMA 9)
rlm@145: (gen-get-set-register IF 11)
rlm@145: (gen-get-set-register LCDC 12)
rlm@145: (gen-get-set-register STAT 13)
rlm@145: (gen-get-set-register SCY 14)
rlm@145: (gen-get-set-register SCX 15)
rlm@145: (gen-get-set-register LY 16)
rlm@145: (gen-get-set-register DMA 18)
rlm@145: (gen-get-set-register WY 19)
rlm@145: (gen-get-set-register WX 20)
rlm@145: (gen-get-set-register VBK 21)
rlm@145: (gen-get-set-register HDMA1 22)
rlm@145: (gen-get-set-register HDMA2 23)
rlm@145: (gen-get-set-register HDMA3 24)
rlm@145: (gen-get-set-register HDMA4 25)
rlm@145: (gen-get-set-register HDMA5 26)
rlm@145: (gen-get-set-register SVBK 27)
rlm@145: (gen-get-set-register IE 28)
rlm@145: 
rlm@145: ;;;;;;;;;;;;;;;
rlm@145: 
rlm@145: (defmacro defn-memo
rlm@145:   [& forms]
rlm@145:   (let [fun-name (first forms)]
rlm@145:     `(do
rlm@145:        (defn ~@forms)
rlm@145:        (alter-var-root (var ~fun-name) memoize))))
rlm@145: