From a831c937c6d6d8484dffea9fec30e4e010835fcf Mon Sep 17 00:00:00 2001
From: Michael Smith <m@michaelsmith.be>
Date: Tue, 5 Aug 2025 12:49:08 +0200
Subject: [PATCH] SDL2 version

---
 go.mod  |  5 +++-
 go.sum  |  2 ++
 main.go | 73 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 79 insertions(+), 1 deletion(-)

diff --git a/go.mod b/go.mod
index adda519..016e076 100644
--- a/go.mod
+++ b/go.mod
@@ -2,7 +2,10 @@ module gb-player
 
 go 1.24.5
 
-require github.com/stretchr/testify v1.10.0
+require (
+	github.com/stretchr/testify v1.10.0
+	github.com/veandco/go-sdl2 v0.4.40
+)
 
 require (
 	github.com/davecgh/go-spew v1.1.1 // indirect
diff --git a/go.sum b/go.sum
index 713a0b4..85469e5 100644
--- a/go.sum
+++ b/go.sum
@@ -4,6 +4,8 @@ github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZb
 github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
 github.com/stretchr/testify v1.10.0 h1:Xv5erBjTwe/5IxqUQTdXv5kgmIvbHo3QQyRwhJsOfJA=
 github.com/stretchr/testify v1.10.0/go.mod h1:r2ic/lqez/lEtzL7wO/rwa5dbSLXVDPFyf8C91i36aY=
+github.com/veandco/go-sdl2 v0.4.40 h1:fZv6wC3zz1Xt167P09gazawnpa0KY5LM7JAvKpX9d/U=
+github.com/veandco/go-sdl2 v0.4.40/go.mod h1:OROqMhHD43nT4/i9crJukyVecjPNYYuCofep6SNiAjY=
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405 h1:yhCVgyC4o1eVCa2tZl7eS0r+SDo693bJlVdllGtEeKM=
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
 gopkg.in/yaml.v3 v3.0.1 h1:fxVm/GzAzEWqLHuvctI91KS9hhNmmWOoWu0XTYJS7CA=
diff --git a/main.go b/main.go
index e56f3c1..1b22521 100644
--- a/main.go
+++ b/main.go
@@ -2,9 +2,18 @@ package main
 
 import (
 	"fmt"
+	"log"
+	"runtime"
+
 	"gb-player/gb"
+
+	"github.com/veandco/go-sdl2/sdl"
 )
 
+func init() {
+	runtime.LockOSThread()
+}
+
 func main() {
 	cartridge := gb.Insert("rom.gb")
 	fmt.Println("Title:", cartridge.Title)
@@ -15,4 +24,68 @@ func main() {
 	fmt.Println("RAM size:", cartridge.RAMSize)
 	fmt.Println("Publication destination:", cartridge.Destination)
 	fmt.Println("ROM version:", cartridge.Version)
+	fmt.Println()
+
+	cpu := gb.Reset()
+	fmt.Println("Program counter:", cpu.PC)
+	gb.Tick(&cpu)
+	fmt.Println("Program counter:", cpu.PC)
+
+	if err := sdl.Init(sdl.INIT_EVERYTHING); err != nil {
+		log.Fatal(err)
+	}
+	defer sdl.Quit()
+
+	window, err := sdl.CreateWindow(
+		"GB Player",
+		sdl.WINDOWPOS_UNDEFINED,
+		sdl.WINDOWPOS_UNDEFINED,
+		800, 600,
+		sdl.WINDOW_SHOWN)
+	if err != nil {
+		panic(err)
+	}
+	defer window.Destroy()
+
+	renderer, err := sdl.CreateRenderer(window, -1, 0)
+	if err != nil {
+		panic(err)
+	}
+	defer renderer.Destroy()
+
+	renderer.RenderSetVSync(true)
+	renderer.SetDrawColor(0x63, 0x94, 0xED, 0xff)
+
+	var frameCount uint32 = 0
+	var startTicks = sdl.GetTicks()
+
+	running := true
+	for running {
+		// frameStartTime := sdl.GetTicks()
+
+		for event := sdl.PollEvent(); event != nil; event = sdl.PollEvent() {
+			switch event.(type) {
+			case *sdl.QuitEvent:
+				println("Quit")
+				running = false
+				break
+			}
+		}
+
+		renderer.Clear()
+		renderer.Present()
+
+		// Calculate framerate
+		frameCount++
+		currentTicks := sdl.GetTicks()
+		elapsed := currentTicks - startTicks
+		if elapsed >= 1000 {
+			fps := float32(frameCount) / (float32(elapsed) / 1000.0)
+            fmt.Printf("FPS: %.2f\n", fps)
+
+            // Reset counters
+            frameCount = 0
+            startTicks = currentTicks
+		}
+	}
 }