f32: move to exp/f32.

In the long term, a lot of this package should be removed in favor of the
golang.org/x/image/math/f32 package. The latter is the common location for
matrix types shared across graphics libraries. For example, the
golang.org/x/image/draw package refers to golang.org/x/image/math/f64.

Change-Id: I9d7ccd3cb35912e0d9dc5bd46c919516ea840340
Reviewed-on: https://go-review.googlesource.com/11856
Reviewed-by: Hyang-Ah Hana Kim <hyangah@gmail.com>

example/audio/main.go

@@ -42,10 +42,10 @@ import (
 	"golang.org/x/mobile/event"
 	"golang.org/x/mobile/exp/app/debug"
 	"golang.org/x/mobile/exp/audio"
+	"golang.org/x/mobile/exp/f32"
 	"golang.org/x/mobile/exp/sprite"
 	"golang.org/x/mobile/exp/sprite/clock"
 	"golang.org/x/mobile/exp/sprite/glsprite"
-	"golang.org/x/mobile/f32"
 	"golang.org/x/mobile/gl"
 )
 

example/basic/main.go

@@ -33,8 +33,8 @@ import (
 	"golang.org/x/mobile/app"
 	"golang.org/x/mobile/event"
 	"golang.org/x/mobile/exp/app/debug"
+	"golang.org/x/mobile/exp/f32"
 	"golang.org/x/mobile/exp/gl/glutil"
-	"golang.org/x/mobile/f32"
 	"golang.org/x/mobile/geom"
 	"golang.org/x/mobile/gl"
 )

example/sprite/main.go

@@ -38,10 +38,10 @@ import (
 	"golang.org/x/mobile/asset"
 	"golang.org/x/mobile/event"
 	"golang.org/x/mobile/exp/app/debug"
+	"golang.org/x/mobile/exp/f32"
 	"golang.org/x/mobile/exp/sprite"
 	"golang.org/x/mobile/exp/sprite/clock"
 	"golang.org/x/mobile/exp/sprite/glsprite"
-	"golang.org/x/mobile/f32"
 	"golang.org/x/mobile/gl"
 )
 

exp/f32/f32.go

@@ -23,7 +23,7 @@
 // The interface to this package is not stable. It will change considerably.
 // Only use functions that provide package documentation. Semantics are
 // non-obvious. Be prepared for the package name to change.
-package f32 // import "golang.org/x/mobile/f32"
+package f32 // import "golang.org/x/mobile/exp/f32"
 
 import (
 	"encoding/binary"

exp/gl/glutil/glimage.go

@@ -14,7 +14,7 @@ import (
 	"sync"
 
 	"golang.org/x/mobile/event"
-	"golang.org/x/mobile/f32"
+	"golang.org/x/mobile/exp/f32"
 	"golang.org/x/mobile/geom"
 	"golang.org/x/mobile/gl"
 )

exp/gl/glutil/glutil.go

@@ -8,7 +8,7 @@ package glutil // import "golang.org/x/mobile/exp/gl/glutil"
 import (
 	"fmt"
 
-	"golang.org/x/mobile/f32"
+	"golang.org/x/mobile/exp/f32"
 	"golang.org/x/mobile/gl"
 )
 

exp/sprite/glsprite/glsprite.go

@@ -13,10 +13,10 @@ import (
 	"image/draw"
 
 	"golang.org/x/mobile/event"
+	"golang.org/x/mobile/exp/f32"
 	"golang.org/x/mobile/exp/gl/glutil"
 	"golang.org/x/mobile/exp/sprite"
 	"golang.org/x/mobile/exp/sprite/clock"
-	"golang.org/x/mobile/f32"
 	"golang.org/x/mobile/geom"
 )
 

exp/sprite/portable/affine.go

@@ -8,7 +8,7 @@ import (
 	"image"
 	"image/draw"
 
-	"golang.org/x/mobile/f32"
+	"golang.org/x/mobile/exp/f32"
 )
 
 // affine draws each pixel of dst using bilinear interpolation of the

exp/sprite/portable/affine_test.go

@@ -15,7 +15,7 @@ import (
 	"testing"
 
 	"golang.org/x/mobile/event"
-	"golang.org/x/mobile/f32"
+	"golang.org/x/mobile/exp/f32"
 	"golang.org/x/mobile/geom"
 )
 

exp/sprite/portable/portable.go

@@ -14,9 +14,9 @@ import (
 	"image/draw"
 
 	"golang.org/x/mobile/event"
+	"golang.org/x/mobile/exp/f32"
 	"golang.org/x/mobile/exp/sprite"
 	"golang.org/x/mobile/exp/sprite/clock"
-	"golang.org/x/mobile/f32"
 )
 
 // Engine builds a sprite Engine that renders onto dst.

exp/sprite/sprite.go

@@ -29,8 +29,8 @@ import (
 	"image/draw"
 
 	"golang.org/x/mobile/event"
+	"golang.org/x/mobile/exp/f32"
 	"golang.org/x/mobile/exp/sprite/clock"
-	"golang.org/x/mobile/f32"
 )
 
 type Arranger interface {