internal/restorable: Remove needsDisposingWhenRestoring

Now restoring from context lost doesn't work on browsers. Then,
the constant needsDisposingWhenRestoring is actually always true.

internal/restorable/const_gles.go

@@ -17,6 +17,4 @@
 
 package restorable
 
-const needsDisposingWhenRestoring = true
-
 const canDetectContextLostExplicitly = true

internal/restorable/const_js.go

@@ -14,11 +14,5 @@
 
 package restorable
 
-// needsDisposingWhenRestoring reports whether disposing resources is necessary or not when restoring.
-//
-// On browsers, disposing resources is not required since the objects are already managed by JavaScript GC and they
-// are already invalidated. Rather, disposing them when restoring causes warnings on the console.
-const needsDisposingWhenRestoring = false
-
 // canDetectContextLostExplicitly reports whether the context lost can be detected by handlers in an explicit way.
 const canDetectContextLostExplicitly = true

internal/restorable/const_others.go

@@ -19,6 +19,4 @@
 
 package restorable
 
-const needsDisposingWhenRestoring = true
-
 const canDetectContextLostExplicitly = false

internal/restorable/images.go

@@ -201,9 +201,7 @@ func (i *images) restore() error {
 
 	// Dispose all the shaders ahead of restoring. A current shader ID and a new shader ID can be duplicated.
 	for s := range i.shaders {
-		if needsDisposingWhenRestoring {
-			s.shader.Dispose()
-		}
+		s.shader.Dispose()
 		s.shader = nil
 	}
 	for s := range i.shaders {
@@ -213,9 +211,7 @@ func (i *images) restore() error {
 	// Dispose all the images ahead of restoring. A current texture ID and a new texture ID can be duplicated.
 	// TODO: Write a test to confirm that ID duplication never happens.
 	for i := range i.images {
-		if needsDisposingWhenRestoring {
-			i.image.Dispose()
-		}
+		i.image.Dispose()
 		i.image = nil
 	}