graphics: Don't call IsTexture on browsers

graphicscontext.go

@@ -37,7 +37,7 @@ type graphicsContext struct {
 	screen      *Image
 	screenScale float64
 	initialized int32
-	invalidated bool
+	invalidated bool // browser only
 }
 
 func (c *graphicsContext) GLContext() *opengl.Context {
@@ -100,17 +100,6 @@ func (c *graphicsContext) SetSize(screenWidth, screenHeight int, screenScale flo
 	return nil
 }
 
-func (c *graphicsContext) needsRestoring(context *opengl.Context) (bool, error) {
-	if c.invalidated {
-		return true, nil
-	}
-	// FlushCommands is required because c.offscreen.impl might not have an actual texture.
-	if err := graphics.FlushCommands(context); err != nil {
-		return false, err
-	}
-	return c.offscreen.restorable.IsInvalidated(context), nil
-}
-
 func (c *graphicsContext) initializeIfNeeded(context *opengl.Context) error {
 	if atomic.LoadInt32(&c.initialized) == 0 {
 		if err := graphics.Reset(context); err != nil {

graphicscontext_js.go

@@ -0,0 +1,25 @@
+// Copyright 2017 The Ebiten Authors
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+// +build js
+
+package ebiten
+
+import (
+	"github.com/hajimehoshi/ebiten/internal/opengl"
+)
+
+func (c *graphicsContext) needsRestoring(context *opengl.Context) (bool, error) {
+	return c.invalidated, nil
+}

graphicscontext_notjs.go

@@ -0,0 +1,30 @@
+// Copyright 2017 The Ebiten Authors
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+// +build !js
+
+package ebiten
+
+import (
+	"github.com/hajimehoshi/ebiten/internal/graphics"
+	"github.com/hajimehoshi/ebiten/internal/opengl"
+)
+
+func (c *graphicsContext) needsRestoring(context *opengl.Context) (bool, error) {
+	// FlushCommands is required because c.offscreen.impl might not have an actual texture.
+	if err := graphics.FlushCommands(context); err != nil {
+		return false, err
+	}
+	return c.offscreen.restorable.IsInvalidated(context), nil
+}