diff --git a/imageparts.go b/imageparts.go
index fe5e5c943..0c769570f 100644
--- a/imageparts.go
+++ b/imageparts.go
@@ -69,17 +69,12 @@ func (w *wholeImage) Src(i int) (x0, y0, x1, y1 int) {
 	return 0, 0, w.width, w.height
 }
 
-type uv struct {
-	width2p  int
-	height2p int
+func u(x, width2p int) int16 {
+	return int16(math.MaxInt16 * x / width2p)
 }
 
-func (c *uv) u(x int) int16 {
-	return int16(math.MaxInt16 * x / c.width2p)
-}
-
-func (c *uv) v(y int) int16 {
-	return int16(math.MaxInt16 * y / c.height2p)
+func v(y, height2p int) int16 {
+	return int16(math.MaxInt16 * y / height2p)
 }
 
 type textureQuads struct {
@@ -96,10 +91,8 @@ func (t *textureQuads) vertices(vertices []int16) int {
 	p := t.parts
 	w, h := t.width, t.height
 	n := 0
-	c := uv{
-		width2p:  int(graphics.NextPowerOf2Int32(int32(w))),
-		height2p: int(graphics.NextPowerOf2Int32(int32(h))),
-	}
+	width2p := int(graphics.NextPowerOf2Int32(int32(w)))
+	height2p := int(graphics.NextPowerOf2Int32(int32(h)))
 	for i := 0; i < l; i++ {
 		dx0, dy0, dx1, dy1 := p.Dst(i)
 		if dx0 == dx1 || dy0 == dy1 {
@@ -110,7 +103,7 @@ func (t *textureQuads) vertices(vertices []int16) int {
 		if sx0 == sx1 || sy0 == sy1 {
 			continue
 		}
-		u0, v0, u1, v1 := c.u(sx0), c.v(sy0), c.u(sx1), c.v(sy1)
+		u0, v0, u1, v1 := u(sx0, width2p), v(sy0, height2p), u(sx1, width2p), v(sy1, height2p)
 		vertices[16*n] = x0
 		vertices[16*n+1] = y0
 		vertices[16*n+2] = u0
diff --git a/internal/graphics/draw.go b/internal/graphics/draw.go
index d919aa454..ba7cf3106 100644
--- a/internal/graphics/draw.go
+++ b/internal/graphics/draw.go
@@ -66,7 +66,7 @@ func drawTexture(c *opengl.Context, texture opengl.Texture, projectionMatrix *[4
 	}
 	p.begin()
 	defer p.end()
-	c.BufferSubData(c.ArrayBuffer, vertices[:16*n])
+	c.BufferSubData(c.ArrayBuffer, vertices)
 	c.DrawElements(c.Triangles, 6*n)
 	return nil
 }