/
main.go
192 lines (172 loc) · 4.24 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
180
181
182
183
184
185
186
187
188
189
190
191
192
package main
import (
"flag"
"fmt"
"log"
"os"
"os/signal"
"time"
"github.com/veandco/go-sdl2/sdl"
"intel8080/display"
"intel8080/intel8080"
)
var testRomPath = flag.String("test", "", "Run a test ROM")
var cpu *intel8080.CPU
func main() {
fmt.Println("Launching...")
flag.Parse()
if *testRomPath != "" {
fmt.Printf("Running a test ROM - %s\n", *testRomPath)
intel8080.RunTestRom(*testRomPath)
return
}
memory := intel8080.NewMemory(0x4000)
romDir := "roms/"
count, err := memory.LoadRomFiles([]string{
romDir + "invaders.h",
romDir + "invaders.g",
romDir + "invaders.f",
romDir + "invaders.e",
}, 0x0, true)
fmt.Printf("%d bytes loaded\n", count)
if err != nil {
fmt.Printf("LoadRomFiles failed: %v\n", err)
os.Exit(1)
}
ioBus := intel8080.NewIOBus()
cpu = intel8080.NewCPU(ioBus, memory)
if err != nil {
log.Fatalf("load invaders failed: %v", err)
os.Exit(0)
}
running := true
// Trap SIGINT for debugging purposes
c := make(chan os.Signal, 1)
signal.Notify(c, os.Interrupt)
go func() {
for sig := range c {
log.Printf("(sig %v) Dumping memory... ", sig)
err := dumpCoreToFile("core.dump", memory)
if err != nil {
log.Printf("dumpCoreToFile error: %v\n", err)
}
running = false
}
}()
screenCols := uint(256)
screenRows := uint(224)
screenWidth := uint(512)
screenHeight := screenRows * screenWidth / screenCols
display.Init(screenHeight, screenWidth, screenRows, screenCols)
defer display.Cleanup()
cm := display.NewColorMask()
cm.AddBoxMask(0, screenCols, 48, 64, 0xff00ff00) // Green
cm.AddBoxMask(0, screenCols, 192, 224, 0xffff0000) // Red
display.SetColorMask(cm)
vram := cpu.GetVram()
fmt.Println("Starting CPU")
var holdCycles uint
var currCycles uint
var interruptType uint = 1
sleepTime := time.Duration(0)
for running {
if holdCycles > 0 {
holdCycles--
time.Sleep(sleepTime)
continue
}
holdCycles, err = cpu.Step()
if err != nil {
fmt.Printf("CPU Execution error: %v\n", err)
running = false
}
currCycles += holdCycles
if currCycles > 16666 {
currCycles = 0
if interruptType == 2 {
interruptType = 1
} else if interruptType == 1 {
interruptType = 2
}
_ = display.DrawRotated(vram)
// trigger interrupt (this happens in hardware at VBlank and ~1/2 VBlank)
cpu.Interrupt(interruptType)
for event := sdl.PollEvent(); event != nil; event = sdl.PollEvent() {
switch t := event.(type) {
case *sdl.KeyboardEvent:
// Game input
pressed := false
if t.Type == sdl.KEYDOWN {
pressed = true
} else if t.Type == sdl.KEYUP {
pressed = false
}
switch t.Keysym.Sym {
case sdl.K_c:
ioBus.HandleInput(1, 0, pressed)
case sdl.K_SPACE:
ioBus.HandleInput(1, 2, pressed)
case sdl.K_w:
ioBus.HandleInput(1, 4, pressed)
case sdl.K_a:
ioBus.HandleInput(1, 5, pressed)
case sdl.K_d:
ioBus.HandleInput(1, 6, pressed)
case sdl.K_t:
ioBus.HandleInput(2, 2, pressed)
}
// Misc input
if t.Type == sdl.KEYDOWN {
switch t.Keysym.Sym {
case sdl.K_ESCAPE:
running = false
case sdl.K_LEFTBRACKET:
if cpu.DEBUG {
cpu.DEBUG = false
} else {
cpu.DEBUG = true
}
case sdl.K_RIGHTBRACKET:
if ioBus.DEBUG {
ioBus.DEBUG = false
} else {
ioBus.DEBUG = true
}
case sdl.K_p:
if memory.DEBUG {
memory.DEBUG = false
} else {
memory.DEBUG = true
}
case sdl.K_COMMA:
sleepTime += 1 * time.Nanosecond
fmt.Printf("sleepTime: %d\n", sleepTime)
case sdl.K_PERIOD:
sleepTime -= 1 * time.Nanosecond
if sleepTime < 0 {
sleepTime = 0
}
fmt.Printf("sleepTime: %d\n", sleepTime)
}
}
case *sdl.QuitEvent:
println("Quit")
running = false
}
}
}
time.Sleep(sleepTime)
}
}
func dumpCoreToFile(filename string, memory *intel8080.Memory) error {
f, err := os.OpenFile(filename, os.O_CREATE|os.O_TRUNC|os.O_WRONLY, 0o600)
if err != nil {
return fmt.Errorf("failed to open file: %v", err)
}
defer f.Close()
_, err = f.Write(memory.GetMemoryCopy())
if err != nil {
return fmt.Errorf("writing to file failed: %v", err)
}
return nil
}