Update doc gen

_docs/gen.go

@@ -33,7 +33,7 @@ import (
 var license = ""
 
 func init() {
-	b, err := ioutil.ReadFile("../license.txt")
+	b, err := ioutil.ReadFile("../LICENSE")
 	if err != nil {
 		panic(err)
 	}

_docs/index.tmpl.html

@@ -53,8 +53,7 @@ pre {
 </p>
 
 <h2>Install on Mac OS X</h2>
-<pre><code>:; brew install glfw3 # or homebrew/versions/glfw3
-:; go get github.com/hajimehoshi/ebiten</code></pre>
+<pre><code>:; go get github.com/hajimehoshi/ebiten</code></pre>
 <p>If you want to run your game on a web browser, execute this:</p>
 <pre><code>:; go get github.com/gopherjs/gopherjs
 :; go get github.com/gopherjs/webgl</code></pre>

_docs/public/example/piano.html

@@ -40,13 +40,14 @@ pre {
 
 import (
     "fmt"
+    "image/color"
+    "log"
+    "math"
+
     "github.com/hajimehoshi/ebiten"
     "github.com/hajimehoshi/ebiten/ebitenutil"
     "github.com/hajimehoshi/ebiten/example/common"
     "github.com/hajimehoshi/ebiten/exp/audio"
-    "image/color"
-    "log"
-    "math"
 )
 
 const (
@@ -73,8 +74,30 @@ func init() {
     }
 }
 
+var (
+    noteCache = map[int][]byte{}
+)
+
+func toBytes(l, r []int16) []byte {
+    if len(l) != len(r) {
+        panic("len(l) must equal to len(r)")
+    }
+    b := make([]byte, len(l)*4)
+    for i, _ := range l {
+        b[4*i] = byte(l[i])
+        b[4*i+1] = byte(l[i] >> 8)
+        b[4*i+2] = byte(r[i])
+        b[4*i+3] = byte(r[i] >> 8)
+    }
+    return b
+}
+
 func addNote(freq float64, vol float64) {
     f := int(freq)
+    if n, ok := noteCache[f]; ok {
+        audio.Play(-1, n)
+        return
+    }
     length := len(pcm) * baseFreq / f
     l := make([]int16, length)
     r := make([]int16, length)
@@ -87,7 +110,9 @@ func addNote(freq float64, vol float64) {
         jj += f
         j = jj / baseFreq
     }
-    audio.Play(-1, l, r)
+    n := toBytes(l, r)
+    noteCache[f] = n
+    audio.Play(-1, n)
 }
 
 var keys = []ebiten.Key{
@@ -127,6 +152,36 @@ func updateInput() {
     }
 }
 
+var pianoImage *ebiten.Image
+
+func init() {
+    var err error
+    pianoImage, err = ebiten.NewImage(screenWidth, screenHeight, ebiten.FilterNearest)
+    if err != nil {
+        panic(err)
+    }
+    whiteKeys := []string{"A", "S", "D", "F", "G", "H", "J", "K", "L"}
+    width := 24
+    y := 48
+    for i, k := range whiteKeys {
+        x := i*width + 36
+        height := 112
+        pianoImage.DrawFilledRect(x, y, width-1, height, color.White)
+        common.ArcadeFont.DrawText(pianoImage, k, x+8, y+height-16, 1, color.Black)
+    }
+
+    blackKeys := []string{"Q", "W", "", "R", "T", "", "U", "I", "O"}
+    for i, k := range blackKeys {
+        if k == "" {
+            continue
+        }
+        x := i*width + 24
+        height := 64
+        pianoImage.DrawFilledRect(x, y, width-1, height, color.Black)
+        common.ArcadeFont.DrawText(pianoImage, k, x+8, y+height-16, 1, color.White)
+    }
+}
+
 func update(screen *ebiten.Image) error {
     updateInput()
     for i, key := range keys {
@@ -137,27 +192,7 @@ func update(screen *ebiten.Image) error {
     }
 
     screen.Fill(color.RGBA{0x80, 0x80, 0xc0, 0xff})
-
-    whiteKeys := []string{"A", "S", "D", "F", "G", "H", "J", "K", "L"}
-    width := 24
-    y := 48
-    for i, k := range whiteKeys {
-        x := i*width + 36
-        height := 112
-        screen.DrawFilledRect(x, y, width-1, height, color.White)
-        common.ArcadeFont.DrawText(screen, k, x+8, y+height-16, 1, color.Black)
-    }
-
-    blackKeys := []string{"Q", "W", "", "R", "T", "", "U", "I", "O"}
-    for i, k := range blackKeys {
-        if k == "" {
-            continue
-        }
-        x := i*width + 24
-        height := 64
-        screen.DrawFilledRect(x, y, width-1, height, color.Black)
-        common.ArcadeFont.DrawText(screen, k, x+8, y+height-16, 1, color.White)
-    }
+    screen.DrawImage(pianoImage, nil)
 
     ebitenutil.DebugPrint(screen, fmt.Sprintf("FPS: %0.2f", ebiten.CurrentFPS()))
     return nil

_docs/public/index.html

@@ -81,8 +81,7 @@ pre {
 </p>
 
 <h2>Install on Mac OS X</h2>
-<pre><code>:; brew install glfw3 # or homebrew/versions/glfw3
-:; go get github.com/hajimehoshi/ebiten</code></pre>
+<pre><code>:; go get github.com/hajimehoshi/ebiten</code></pre>
 <p>If you want to run your game on a web browser, execute this:</p>
 <pre><code>:; go get github.com/gopherjs/gopherjs
 :; go get github.com/gopherjs/webgl</code></pre>