/
main.go
179 lines (150 loc) · 3.86 KB
/
main.go
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
package main
import (
"math/rand"
"runtime"
"time"
"github.com/gonutz/go8/chip8"
"github.com/gonutz/go8/games"
"github.com/gonutz/prototype/draw"
)
func init() {
runtime.LockOSThread()
}
var game *games.Game
func main() {
game = games.Blitz
game.FillEmptyData()
rand.Seed(time.Now().UnixNano())
vm := chip8.NewInterpreter()
vm.SetRandomizer(randomizer{})
speakers := &speakers{}
vm.SetSpeakers(speakers)
keyboard := &keyboard{}
vm.SetKeyboard(keyboard)
keyEvent := &keyEvent{
last: -1,
}
vm.SetKeyEvent(keyEvent)
vm.LoadProgram(game.Program)
clockTicksPerFrame := int(float64(game.ClockSpeed)/float64(time.Second/60) + 0.5)
if clockTicksPerFrame < 1 {
clockTicksPerFrame = 1
}
instructionsPerFrame := game.InstructionsPerCycle * clockTicksPerFrame
draw.RunWindow("GO 8", 640, 320, func(window draw.Window) {
if window.WasKeyPressed(draw.KeyEscape) {
window.Close()
return
}
if window.WasKeyPressed(draw.KeyP) {
vm.SetPaused(!vm.Paused())
}
speakers.window = window
keyboard.window = window
keyEvent.update(window)
for i := 0; i < instructionsPerFrame; i++ {
vm.ExecuteNext()
}
vm.TimerTick()
drawScreen(window, vm.Screen())
})
}
func drawScreen(window draw.Window, screen chip8.Screen) {
b := game.BackgroundColor
back := draw.Color{float32(b.R) / 255, float32(b.G) / 255, float32(b.B) / 255, 1}
f := game.ForegroundColor
fore := draw.Color{float32(f.R) / 255, float32(f.G) / 255, float32(f.B) / 255, 1}
windowW, windowH := window.Size()
window.FillRect(0, 0, windowW, windowH, draw.Gray)
screenW, screenH := screen.Size()
tileSize := min(windowW/screenW, windowH/screenH)
xOffset := (windowW - screenW*tileSize) / 2
yOffset := (windowH - screenH*tileSize) / 2
window.FillRect(xOffset, yOffset, screenW*tileSize, screenH*tileSize, back)
for y := 0; y < screenH; y++ {
for x := 0; x < screenW; x++ {
if screen.IsSet(x, y) {
window.FillRect(
xOffset+x*tileSize,
yOffset+y*tileSize,
tileSize,
tileSize,
fore,
)
}
}
}
}
func min(a, b int) int {
if a < b {
return a
}
return b
}
type randomizer struct{}
func (randomizer) Next() uint8 {
return uint8(rand.Int() % 256)
}
type speakers struct {
window draw.Window
}
func (s *speakers) Beep() {
s.window.PlaySoundFile("./beep.wav")
}
func (*speakers) BeQuiet() {}
type keyboard struct {
window draw.Window
}
func (k *keyboard) KeyDown(key uint8) bool {
for gameKey, intKey := range game.Keys {
for _, keyName := range gameKeyToKeyName[gameKey] {
if key == intKey && k.window.IsKeyDown(keyName) {
return true
}
}
}
return false
}
var gameKeyToKeyName = map[games.GameKey][]draw.Key{
games.Left: {draw.KeyLeft},
games.Right: {draw.KeyRight},
games.Up: {draw.KeyUp},
games.Down: {draw.KeyDown},
games.Enter: {draw.KeyEnter, draw.KeyNumEnter},
games.Space: {draw.KeySpace},
games.Number0: {draw.Key0, draw.KeyNum0},
games.Number1: {draw.Key1, draw.KeyNum1},
games.Number2: {draw.Key2, draw.KeyNum2},
games.Number3: {draw.Key3, draw.KeyNum3},
games.Number4: {draw.Key4, draw.KeyNum4},
games.Number5: {draw.Key5, draw.KeyNum5},
games.Number6: {draw.Key6, draw.KeyNum6},
games.Number7: {draw.Key7, draw.KeyNum7},
games.Number8: {draw.Key8, draw.KeyNum8},
games.Number9: {draw.Key9, draw.KeyNum9},
games.KeyA: {draw.KeyA},
games.KeyB: {draw.KeyB},
games.KeyC: {draw.KeyC},
games.KeyD: {draw.KeyD},
games.KeyE: {draw.KeyE},
games.KeyF: {draw.KeyF},
games.KeyQ: {draw.KeyQ},
}
type keyEvent struct {
last int
}
func (k *keyEvent) LastKey() (keyWasPressed bool, key uint8) {
return k.last != -1, uint8(k.last)
}
func (k *keyEvent) ClearLastKey() {
k.last = -1
}
func (k *keyEvent) update(window draw.Window) {
for gameKey, intKey := range game.Keys {
for _, keyName := range gameKeyToKeyName[gameKey] {
if window.WasKeyPressed(keyName) {
k.last = int(intKey)
}
}
}
}