graphics: Refactoring: Initialize 'quadFloat32Num' and reuse it

vertices.go

@@ -14,8 +14,14 @@
 
 package ebiten
 
+import (
+	"github.com/hajimehoshi/ebiten/internal/graphics"
+)
+
 // texelAdjustment represents a number to be used to adjust texel.
 // Texels are adjusted by amount propotional to inverse of texelAdjustment.
 // This is necessary not to use unexpected pixels outside of texels.
 // See #317.
 const texelAdjustment = 256
+
+var quadFloat32Num = graphics.QuadVertexSizeInBytes() / 4

vertices_js.go

@@ -20,14 +20,12 @@ import (
 	"github.com/gopherjs/gopherjs/js"
 
 	"github.com/hajimehoshi/ebiten/internal/affine"
-	"github.com/hajimehoshi/ebiten/internal/graphics"
 )
 
 func vertices(parts ImageParts, width, height int, geo *affine.GeoM) []float32 {
 	// TODO: This function should be in graphics package?
-	totalSize := graphics.QuadVertexSizeInBytes() / 4
 	l := parts.Len()
-	vs := js.Global.Get("Float32Array").New(l * totalSize)
+	vs := js.Global.Get("Float32Array").New(l * quadFloat32Num)
 	g := geo.UnsafeElements()
 	g0 := g[0]
 	g1 := g[1]
@@ -103,7 +101,7 @@ func vertices(parts ImageParts, width, height int, geo *affine.GeoM) []float32 {
 		vs.SetIndex(n+38, g4)
 		vs.SetIndex(n+39, g5)
 
-		n += totalSize
+		n += quadFloat32Num
 	}
 	return vs.Interface().([]float32)
 }

vertices_notjs.go

@@ -18,14 +18,12 @@ package ebiten
 
 import (
 	"github.com/hajimehoshi/ebiten/internal/affine"
-	"github.com/hajimehoshi/ebiten/internal/graphics"
 )
 
 func vertices(parts ImageParts, width, height int, geo *affine.GeoM) []float32 {
 	// TODO: This function should be in graphics package?
-	totalSize := graphics.QuadVertexSizeInBytes() / 4
 	l := parts.Len()
-	vs := make([]float32, l*totalSize)
+	vs := make([]float32, l*quadFloat32Num)
 	g := geo.UnsafeElements()
 	g0 := float32(g[0])
 	g1 := float32(g[1])
@@ -102,7 +100,7 @@ func vertices(parts ImageParts, width, height int, geo *affine.GeoM) []float32 {
 		vs[n+38] = g4
 		vs[n+39] = g5
 
-		n += totalSize
+		n += quadFloat32Num
 	}
 	return vs
 }