From b0797ff4af44e9395d8098819c0fbe8fc095cebc Mon Sep 17 00:00:00 2001
From: "S.D" <sb201418@gmail.com>
Date: Mon, 12 Oct 2020 22:16:30 +0100
Subject: [PATCH] user input! sorta playable

---
 chip8/chip8.go  |  4 ++++
 cmd/web/main.go | 55 ++++++++++++++++++++++++++++++++++++++++++-------
 2 files changed, 52 insertions(+), 7 deletions(-)

diff --git a/chip8/chip8.go b/chip8/chip8.go
index d64935f..8bb2694 100644
--- a/chip8/chip8.go
+++ b/chip8/chip8.go
@@ -332,6 +332,10 @@ func (cpu *Chip8) fifteenIndexOpcodes() {
 
 }
 
+func (cpu *Chip8) UpdateKeys(newKeys [16]byte) {
+	cpu.keys = newKeys
+}
+
 func (cpu *Chip8) PerformCycle() {
 	cpu.opcode = (uint16(cpu.memory[cpu.pc]) << 8) + uint16(cpu.memory[cpu.pc + 1])
 	cpu.pc += 2
diff --git a/cmd/web/main.go b/cmd/web/main.go
index 5722ffb..9ac43af 100644
--- a/cmd/web/main.go
+++ b/cmd/web/main.go
@@ -3,8 +3,8 @@ package main
 import (
 	"image/color"
 	"sync"
-	"time"
 	"syscall/js"
+	"time"
 
 	"github.com/llgcode/draw2d/draw2dimg"
 	"github.com/llgcode/draw2d/draw2dkit"
@@ -21,19 +21,57 @@ var sizeMultiplier = 8
 var drawBuf = [64 * 32]byte{}
 var drawNeeded = false
 var graphicsLock sync.Mutex
+var keysLock sync.Mutex
 var window js.Value
+var keys [16]byte
 
-var keyPressHandler js.Func = js.FuncOf(func(this js.Value, args []js.Value) interface{} {
-	println(args[0].Get("type").String())
-	println(args[0].Get("keyCode").Int())
-	return nil
-})
+var keyMap = map[int]int{
+	88: 0,  // x
+	49: 1,  // 1
+	50: 2,  // 2
+	51: 3,  // 3
+	81: 4,  // q
+	87: 5,  // w
+	69: 6,  // e
+	65: 7,  // a
+	83: 8,  // s
+	68: 9,  // d
+	90: 10, // z
+	67: 11, // c
+	52: 12, // 4
+	82: 13, // r
+	70: 14, // f
+	86: 15, // v
+}
+
+func keyEventHandle(event js.Value) {
+	println(event.Get("type").String())
+	println(event.Get("keyCode").Int())
+	elem, ok := keyMap[event.Get("keyCode").Int()]
+	if ok {
+		keysLock.Lock()
+		defer keysLock.Unlock()
+		if event.Get("type").String() == "keydown" {
+			keys[elem] = 1
+		} else if event.Get("type").String() == "keyup" {
+			keys[elem] = 0
+		}
+	}
+}
 
 func main() {
 	println("CHIP8 IS HERE!")
 	window = js.Global()
 
-	window.Call("addEventListener", "keydown", keyPressHandler)
+	window.Call("addEventListener", "keydown", js.FuncOf(func(this js.Value, args []js.Value) interface{} {
+		keyEventHandle(args[0])
+		return nil
+	}))
+
+	window.Call("addEventListener", "keyup", js.FuncOf(func(this js.Value, args []js.Value) interface{} {
+		keyEventHandle(args[0])
+		return nil
+	}))
 
 	cvs, _ = canvas.NewCanvas2d(false)
 	cvs.Create(int(width)*sizeMultiplier, int(height)*sizeMultiplier)
@@ -54,6 +92,9 @@ func main() {
 			graphicsLock.Lock()
 			drawBuf = cpu.GetGraphicsBuffer()
 			graphicsLock.Unlock()
+			keysLock.Lock()
+			cpu.UpdateKeys(keys)
+			keysLock.Unlock()
 		}
 		i++
 		if i > 7 {