Add Surface rotozoom Support

.gitignore

@@ -1,11 +1,2 @@
-**~
-main
-**.[o86]
-.obj/
-**.cgo*.*
-**/_obj
-**/*.out
-test/test
-shoot.png
-**_cgo*
-*.so
+sdl-test/sdl-test
+sdl-template/sdl-template

README.md

@@ -0,0 +1,29 @@
+# Introduction
+
+This is an improved version of 0xe2-0x9a-0x9b's [Go-SDL](https://github.com/0xe2-0x9a-0x9b/Go-SDL)
+currently mantained by neagix.
+
+The improvements/differences are:
+
+* audio callback support
+* downstreaming support
+
+There is a nice and fully working PC speaker buzzer example in examples/callback.
+
+# Known issues
+
+The re-designed audio system supports only signed 16bit samples, but writing the others is as easy as a copy/paste.
+
+# Installation
+
+Make sure you have SDL, SDL-image, SDL-mixer and SDL-ttf (all in -dev version).
+
+Installing libraries and examples:
+
+    go get -v github.com/neagix/Go-SDL/sdl
+    go get -v github.com/neagix/Go-SDL/sdl/audio
+
+
+# Credits
+
+Music to test SDL-mixer is by Kevin MacLeod.

examples/callback/buzzer.go

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+/*
+ * Copyright neagix 2013
+ * This sample is part of langwar project
+ * https://github.com/neagix/langwar
+ * 
+ * Licensed under GNU/GPL v2
+ */
+
+package main
+
+import "github.com/neagix/Go-SDL/sdl/audio"
+import "math"
+import "time"
+
+type BeepObject struct {
+	Freq        float64
+	SamplesLeft int
+}
+
+var Play chan BeepObject
+
+const AMPLITUDE = 28000
+const FREQUENCY = 44100
+const AUDIO_SAMPLES = 2048
+
+func Beep(freq, duration int) {
+	bo := BeepObject{
+		Freq:        float64(freq),
+		SamplesLeft: duration * FREQUENCY / 1000}
+
+	Play <- bo
+}
+
+func Init() bool {
+
+	desiredSpec := audio.AudioSpec{
+		Freq:     FREQUENCY,
+		Format:   audio.AUDIO_S16SYS,
+		Channels: 1,
+		Samples:  AUDIO_SAMPLES,
+	}
+	var obtainedSpec audio.AudioSpec
+
+	if audio.OpenAudio(&desiredSpec, &obtainedSpec) != 0 {
+		return false
+	}
+
+	Play = make(chan BeepObject)
+
+	// start the playback queue processor
+	go func() {
+		for {
+			// pick next beep object
+			bo := <-Play
+
+			stream := make([]int16, bo.SamplesLeft)
+
+			v := float64(0)
+			for i := 0; i < bo.SamplesLeft; i++ {
+				stream[i] = int16(AMPLITUDE * math.Sin(v*2*math.Pi/FREQUENCY))
+				v += bo.Freq
+			}
+
+			audio.SendAudio_int16(stream)
+		}
+	}()
+
+	return true
+}
+
+// to be deferred after corresponding Init()
+func Quit() {
+	defer audio.CloseAudio()
+}
+
+// song by niniel1 as found at http://gendou.com/t/20439
+func PlaySong1() {
+	Beep(349, 400)
+	time.Sleep(time.Millisecond * 33)
+	Beep(392, 133)
+	time.Sleep(time.Millisecond * 33)
+	Beep(440, 267)
+	time.Sleep(time.Millisecond * 33)
+	Beep(440, 267)
+	time.Sleep(time.Millisecond * 33)
+	Beep(392, 133)
+	time.Sleep(time.Millisecond * 33)
+	Beep(349, 133)
+	time.Sleep(time.Millisecond * 33)
+	Beep(392, 133)
+	time.Sleep(time.Millisecond * 33)
+	Beep(440, 133)
+	time.Sleep(time.Millisecond * 33)
+	Beep(349, 267)
+	time.Sleep(time.Millisecond * 33)
+	Beep(262, 267)
+	time.Sleep(time.Millisecond * 33)
+	Beep(349, 400)
+	time.Sleep(time.Millisecond * 33)
+	Beep(392, 133)
+	time.Sleep(time.Millisecond * 33)
+	Beep(440, 267)
+	time.Sleep(time.Millisecond * 33)
+	Beep(440, 267)
+	time.Sleep(time.Millisecond * 33)
+	Beep(392, 133)
+	time.Sleep(time.Millisecond * 33)
+	Beep(349, 133)
+	time.Sleep(time.Millisecond * 33)
+	Beep(392, 133)
+	time.Sleep(time.Millisecond * 33)
+	Beep(440, 133)
+	time.Sleep(time.Millisecond * 33)
+	Beep(349, 533)
+	time.Sleep(time.Millisecond * 33)
+}
+
+// find out more songs at https://github.com/binarypearl/beepbeep
+func PlaySong3() {
+	Beep(784, 100)
+	Beep(784, 100)
+	Beep(784, 100)
+	time.Sleep(time.Millisecond * 100)
+	Beep(784, 600)
+	Beep(622, 600)
+	Beep(698, 600)
+	Beep(784, 200)
+	time.Sleep(time.Millisecond * 200)
+	Beep(698, 200)
+	Beep(784, 800)
+
+}
+
+func main() {
+	if !Init() {
+		return
+	}
+	defer Quit()
+
+	// start playback, yeah!
+	audio.PauseAudio(false)
+
+	PlaySong1()
+
+	// it's a silence :)
+	Beep(0, 400)
+
+	PlaySong3()
+}