128 lines
2.4 KiB
Go
128 lines
2.4 KiB
Go
package main
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import (
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"fmt"
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"log"
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"runtime"
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"github.com/veandco/go-sdl2/sdl"
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"github.com/veandco/go-sdl2/ttf"
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)
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var renderer *sdl.Renderer
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var font *ttf.Font
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func init() {
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runtime.LockOSThread()
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}
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func main() {
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if err := sdl.Init(sdl.INIT_EVERYTHING); err != nil {
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log.Fatal(err)
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}
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defer sdl.Quit()
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if err := ttf.Init(); err != nil {
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log.Fatal((err))
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}
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defer ttf.Quit()
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window, err := sdl.CreateWindow(
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"GB Player",
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sdl.WINDOWPOS_UNDEFINED,
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sdl.WINDOWPOS_UNDEFINED,
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800, 600,
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sdl.WINDOW_SHOWN)
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if err != nil {
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panic(err)
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}
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defer window.Destroy()
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renderer, err = sdl.CreateRenderer(window, -1, 0)
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if err != nil {
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panic(err)
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}
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defer renderer.Destroy()
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renderer.RenderSetVSync(true)
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font, err = ttf.OpenFont("SourceCodePro.ttf", 18)
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if err != nil {
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log.Fatal(err)
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}
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defer font.Close()
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font.SetStyle(ttf.STYLE_BOLD)
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var fps float64
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var frameCount uint32
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var startTicks = sdl.GetTicks64()
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var now uint64
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var last uint64
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cartridge := Insert("rom.gb")
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fmt.Println(cartridge)
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running := true
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for running {
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for event := sdl.PollEvent(); event != nil; event = sdl.PollEvent() {
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switch event.(type) {
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case *sdl.QuitEvent:
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println("Quit")
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running = false
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}
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}
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last = now
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now = sdl.GetPerformanceCounter()
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deltaTime := float64((now - last) * 1000.0 / sdl.GetPerformanceFrequency())
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_ = deltaTime
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// Clear screen
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renderer.SetDrawColor(0x63, 0x94, 0xED, 0xff)
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renderer.Clear()
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// Update state
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rect := sdl.Rect{X: 100, Y: 100, W: 200, H: 150}
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renderer.SetDrawColor(0, 0, 255, 255)
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renderer.FillRect(&rect)
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drawDebugWindow(fps)
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// Present to screen
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renderer.Present()
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// Calculate framerate
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frameCount++
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currentTicks := sdl.GetTicks64()
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elapsed := currentTicks - startTicks
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if elapsed >= 1000 {
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fps = float64(frameCount) / (float64(elapsed) / 1000.0)
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// Reset counters
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frameCount = 0
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startTicks = currentTicks
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}
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}
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}
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func drawDebugWindow(fps float64) {
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var textSurface *sdl.Surface
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var textTexture *sdl.Texture
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// FPS
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textSurface, err := font.RenderUTF8Blended(fmt.Sprintf("FPS: %.2f", fps), sdl.Color{R: 0, G: 0, B: 0, A: 255})
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if err != nil {
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log.Fatal(err)
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}
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defer textSurface.Free()
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textTexture, err = renderer.CreateTextureFromSurface(textSurface)
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if err != nil {
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log.Fatal(err)
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}
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defer textTexture.Destroy()
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textRect := sdl.Rect{X: 0, Y: 0, W: textSurface.W, H: textSurface.H}
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renderer.Copy(textTexture, nil, &textRect)
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}
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