start trying to get wasm workinng

.drone.yml

@@ -19,7 +19,10 @@ steps:
   image: golang:latest
   commands:
   - GOOS=darwin GOARCH=amd64 go build -o mac_test ./cmd/test_prog
-      
+- name : build wasm
+  image: golang:latest
+  commands:
+  - GOOS=js GOARCH=wasm go build -o main.wasm ./cmd/web      
 
 - name: publish
   image: plugins/gitea-release

chip8/chip8.go

@@ -57,9 +57,14 @@ func NewCHIP8(prog []byte) *Chip8 {
 }
 
 func (cpu *Chip8) GetGraphicsBuffer() [graphicsBufferSize]byte {
+	cpu.drawRequired = false
 	return cpu.graphics
 }
 
+func (cpu *Chip8) DrawIsNeeded() bool {
+	return cpu.drawRequired
+}
+
 func (cpu *Chip8) TickTimers() {
 	if cpu.delayTimer > 0 {
 		cpu.delayTimer--
@@ -241,7 +246,7 @@ func (cpu *Chip8) displaySprite() {
 	cpu.drawRequired = true
 }
 
-func (cpu *Chip8) SkipOnKeyOpcodes() {
+func (cpu *Chip8) skipOnKeyOpcodes() {
 	opcode := cpu.opcode & 0xFF
 	key := cpu.registers[(cpu.opcode>>8)&0x0F]
 	switch opcode {
@@ -260,7 +265,7 @@ func (cpu *Chip8) SkipOnKeyOpcodes() {
 	}
 }
 
-func (cpu *Chip8) FifteenIndexOpcodes() {
+func (cpu *Chip8) fifteenIndexOpcodes() {
 	instruction := cpu.opcode & 0xFF
 	reg := int(cpu.opcode>>8) & 0xF
 	switch instruction {
@@ -271,11 +276,16 @@ func (cpu *Chip8) FifteenIndexOpcodes() {
 	case 0x0A:
 		// FX0A
 		// block + wait for key press
+		found := false
 		for i, val := range cpu.keys {
 			if val != 0 {
 				cpu.registers[reg] = byte(i)
+				found = true
 			}
 		}
+		if !found {
+			cpu.pc -= 2
+		}
 	case 0x15:
 		// FX15
 		// Set delay timer to VX
@@ -321,6 +331,45 @@ func (cpu *Chip8) FifteenIndexOpcodes() {
 
 }
 
+func (cpu *Chip8) PerformCycle() {
+	var opcode uint16 = (uint16(cpu.memory[cpu.pc]) << 8) + uint16(cpu.memory[cpu.pc])
+	cpu.pc += 2
+	switch opcode >> 12 {
+	case 0:
+		cpu.zeroIndexOpcodes()
+	case 1:
+		cpu.goTo()
+	case 2:
+		cpu.callSubroutine()
+	case 3:
+		cpu.skipIfRegisterEqual()
+	case 4:
+		cpu.skipIfRegisterNotEqual()
+	case 5:
+		cpu.skipIfRegistersEqual()
+	case 6:
+		cpu.setRegisterTo()
+	case 7:
+		cpu.registerPlusEqualsNN()
+	case 8:
+		cpu.bitOpsAndMath()
+	case 9:
+		cpu.skipIfRegistersNotEqual()
+	case 0xA:
+		cpu.setAddressRegister()
+	case 0xB:
+		cpu.jumpToV0PlusAddress()
+	case 0xC:
+		cpu.setRegisterToRand()
+	case 0xD:
+		cpu.displaySprite()
+	case 0xE:
+		cpu.skipOnKeyOpcodes()
+	case 0xF:
+		cpu.fifteenIndexOpcodes()
+	}
+}
+
 func main() {
 	fmt.Printf("Hello world!\n")
 	prog := []byte{1, 2, 3, 4}

cmd/web/main.go

@@ -0,0 +1,99 @@
+package main
+
+import (
+	"image/color"
+	"time"
+	"sync"
+
+	"github.com/llgcode/draw2d/draw2dimg"
+	"github.com/llgcode/draw2d/draw2dkit"
+	"github.com/markfarnan/go-canvas/canvas"
+
+	"git.jacknet.io/S.D/Chip-8_Go/chip8"
+)
+
+var done chan struct{}
+
+var cvs *canvas.Canvas2d
+var width, height float64 = 64, 32
+var sizeMultiplier = 8
+var drawBuf = [64 * 32]byte{}
+var graphicsLock sync.Mutex
+var sleeptime = 2000
+
+func main() {
+	println("CHIP8 IS HERE!")
+
+	cvs, _ = canvas.NewCanvas2d(false)
+	cvs.Create(int(width)*sizeMultiplier, int(height)*sizeMultiplier)
+
+	height = float64(cvs.Height())
+	width = float64(cvs.Width())
+
+
+	// load in a rom!!!
+	resp, err := http.Get("https://github.com/dmatlack/chip8/raw/master/roms/games/Space%20Invaders%20%5BDavid%20Winter%5D.ch8")
+	if err != nil {
+		println("FUCK")
+		panic()
+	}
+
+	content := make([]byte, resp.ContentLength)
+	n, err := resp.Body.Read(content)
+
+	if err != nil {
+		println("FUCK")
+		panic()
+	}
+
+	cpu := chip8.NewCHIP8(content)
+
+	cvs.Start(60, Render)
+	i := 0
+	for {
+		c := make(chan int)
+		go timeCycle(c)
+		cpu.PerformCycle()
+		if cpu.DrawIsNeeded() {
+			graphicsLock.Lock()
+			drawBuf = cpu.GetGraphicsBuffer()
+			graphicsLock.Unlock()
+		}
+		i++ 
+		if i > 7 {
+			cpu.TickTimers()
+			i = 0
+		}
+		<-c
+	}
+}
+
+func timeCycle(c chan int) {
+	time.Sleep(sleeptime * time.Microsecond)
+	c <- 0
+}
+
+func Render(gc *draw2dimg.GraphicContext) bool {
+	gc.SetFillColor(color.RGBA{0x00, 0x00, 0x00, 0xff})
+	gc.Clear()
+
+	gc.SetFillColor(color.RGBA{0x00, 0xff, 0x00, 0xff})
+	//gc.SetStrokeColor(color.RGBA{0x00, 0xff, 0x00, 0xff})
+
+	gc.BeginPath()
+	//gc.ArcTo(gs.laserX, gs.laserY, gs.laserSize, gs.laserSize, 0, math.Pi*2)
+	graphicsLock.Lock()
+	defer graphicsLock.Unlock()
+	for i, val := range drawBuf {
+		if val != 0 {
+			x := i % 64
+			y := i / 64
+			// println("drawing to ", x, y)
+			draw2dkit.Rectangle(gc, float64(x*sizeMultiplier), float64(y*sizeMultiplier), float64((x*sizeMultiplier)+sizeMultiplier), float64((y*sizeMultiplier)+sizeMultiplier))
+		}
+	}
+	gc.FillStroke()
+	gc.Close()
+
+	return true
+}

go.mod

@@ -1,3 +1,8 @@
 module git.jacknet.io/S.D/Chip-8_Go
 
 go 1.15
+
+require (
+	github.com/llgcode/draw2d v0.0.0-20200930101115-bfaf5d914d1e
+	github.com/markfarnan/go-canvas v0.0.0-20200722235510-6971ccd00770
+)

go.sum

@@ -0,0 +1,14 @@
+github.com/go-gl/gl v0.0.0-20180407155706-68e253793080/go.mod h1:482civXOzJJCPzJ4ZOX/pwvXBWSnzD4OKMdH4ClKGbk=
+github.com/go-gl/glfw v0.0.0-20180426074136-46a8d530c326/go.mod h1:vR7hzQXu2zJy9AVAgeJqvqgH9Q5CA+iKCZ2gyEVpxRU=
+github.com/golang/freetype v0.0.0-20170609003504-e2365dfdc4a0 h1:DACJavvAHhabrF08vX0COfcOBJRhZ8lUbR+ZWIs0Y5g=
+github.com/golang/freetype v0.0.0-20170609003504-e2365dfdc4a0/go.mod h1:E/TSTwGwJL78qG/PmXZO1EjYhfJinVAhrmmHX6Z8B9k=
+github.com/jung-kurt/gofpdf v1.0.0/go.mod h1:7Id9E/uU8ce6rXgefFLlgrJj/GYY22cpxn+r32jIOes=
+github.com/llgcode/draw2d v0.0.0-20200110163050-b96d8208fcfc/go.mod h1:mVa0dA29Db2S4LVqDYLlsePDzRJLDfdhVZiI15uY0FA=
+github.com/llgcode/draw2d v0.0.0-20200930101115-bfaf5d914d1e h1:YRRazju3DMGuZTSWEj0nE2SCRcK3DW/qdHQ4UQx7sgs=
+github.com/llgcode/draw2d v0.0.0-20200930101115-bfaf5d914d1e/go.mod h1:mVa0dA29Db2S4LVqDYLlsePDzRJLDfdhVZiI15uY0FA=
+github.com/llgcode/ps v0.0.0-20150911083025-f1443b32eedb h1:61ndUreYSlWFeCY44JxDDkngVoI7/1MVhEl98Nm0KOk=
+github.com/llgcode/ps v0.0.0-20150911083025-f1443b32eedb/go.mod h1:1l8ky+Ew27CMX29uG+a2hNOKpeNYEQjjtiALiBlFQbY=
+github.com/markfarnan/go-canvas v0.0.0-20200722235510-6971ccd00770 h1:7t1KxXXIIysYDk1ymAB3NeCRdp8WnV5+JqgSwAm6deg=
+github.com/markfarnan/go-canvas v0.0.0-20200722235510-6971ccd00770/go.mod h1:PqPh9d/lLHBot/ZoW4ZbZaRVLdBIHJZfPYLaC84RSI8=
+golang.org/x/image v0.0.0-20180708004352-c73c2afc3b81 h1:00VmoueYNlNz/aHIilyyQz/MHSqGoWJzpFv/HW8xpzI=
+golang.org/x/image v0.0.0-20180708004352-c73c2afc3b81/go.mod h1:ux5Hcp/YLpHSI86hEcLt0YII63i6oz57MZXIpbrjZUs=