158 lines
2.9 KiB
Go
158 lines
2.9 KiB
Go
package main
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import (
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"fmt"
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"os"
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"github.com/veandco/go-sdl2/sdl"
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)
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const (
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WindowTitle = "Go-SDL2 Render Queue"
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WindowWidth = 800
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WindowHeight = 600
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)
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func run() int {
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var window *sdl.Window
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var renderer *sdl.Renderer
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var points []sdl.Point
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var rect sdl.Rect
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var rects []sdl.Rect
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var err error
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sdl.Do(func() {
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window, err = sdl.CreateWindow(WindowTitle, sdl.WINDOWPOS_UNDEFINED, sdl.WINDOWPOS_UNDEFINED, WindowWidth, WindowHeight, sdl.WINDOW_SHOWN)
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})
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if err != nil {
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fmt.Fprintf(os.Stderr, "Failed to create window: %s\n", err)
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return 1
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}
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defer func() {
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sdl.Do(func() {
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window.Destroy()
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})
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}()
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sdl.Do(func() {
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renderer, err = sdl.CreateRenderer(window, -1, sdl.RENDERER_ACCELERATED)
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})
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if err != nil {
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fmt.Fprint(os.Stderr, "Failed to create renderer: %s\n", err)
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return 2
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}
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sdl.Do(func() {
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renderer.Clear()
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})
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defer func() {
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sdl.Do(func() {
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renderer.Destroy()
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})
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}()
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go func() {
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println("goroutine: A")
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}()
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sdl.Do(func() {
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renderer.SetDrawColor(255, 255, 255, 255)
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renderer.DrawPoint(150, 300)
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println("queue: A")
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})
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go func() {
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println("goroutine: B")
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}()
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sdl.Do(func() {
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renderer.SetDrawColor(0, 0, 255, 255)
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renderer.DrawLine(0, 0, 200, 200)
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println("queue: B")
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})
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go func() {
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println("goroutine: C")
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}()
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sdl.Do(func() {
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points = []sdl.Point{{0, 0}, {100, 300}, {100, 300}, {200, 0}}
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renderer.SetDrawColor(255, 255, 0, 255)
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renderer.DrawLines(points)
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println("queue: C")
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})
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go func() {
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println("goroutine: D")
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}()
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sdl.Do(func() {
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rect = sdl.Rect{300, 0, 200, 200}
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renderer.SetDrawColor(255, 0, 0, 255)
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renderer.DrawRect(&rect)
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println("queue: D")
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})
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go func() {
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println("goroutine: E")
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}()
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sdl.Do(func() {
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rects = []sdl.Rect{{400, 400, 100, 100}, {550, 350, 200, 200}}
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renderer.SetDrawColor(0, 255, 255, 255)
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renderer.DrawRects(rects)
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println("queue: E")
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})
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go func() {
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println("goroutine: F")
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}()
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sdl.Do(func() {
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rect = sdl.Rect{250, 250, 200, 200}
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renderer.SetDrawColor(0, 255, 0, 255)
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renderer.FillRect(&rect)
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println("queue: F")
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})
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go func() {
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println("goroutine: G")
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}()
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sdl.Do(func() {
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rects = []sdl.Rect{{500, 300, 100, 100}, {200, 300, 200, 200}}
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renderer.SetDrawColor(255, 0, 255, 255)
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renderer.FillRects(rects)
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println("queue: G")
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})
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go func() {
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println("goroutine: H")
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}()
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sdl.Do(func() {
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renderer.Present()
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println("queue: H")
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})
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sdl.Do(func() {
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sdl.PollEvent()
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sdl.Delay(2000)
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})
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return 0
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}
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func main() {
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// os.Exit(..) must run AFTER sdl.Main(..) below; so keep track of exit
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// status manually outside the closure passed into sdl.Main(..) below
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var exitcode int
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sdl.Main(func() {
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exitcode = run()
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})
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// os.Exit(..) must run here! If run in sdl.Main(..) above, it will cause
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// premature quitting of sdl.Main(..) function; resource cleaning deferred
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// calls/closing of channels may never run
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os.Exit(exitcode)
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}
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