.travis.yml: Remove libglfw3

.travis.yml

@@ -9,7 +9,6 @@ addons:
       - ubuntu-toolchain-r-test
     packages:
       - libglew-dev # required by node-gl.
-      - libglfw3-dev
       - libopenal-dev
       - libalut-dev
       - libxxf86vm-dev

internal/graphics/opengl/context_js.go

@@ -112,6 +112,13 @@ func (c *Context) init() {
 	gl.BlendFunc(gl.ONE, gl.ONE_MINUS_SRC_ALPHA)
 }
 
+func (c *Context) Check() {
+	gl := c.gl
+	if e := gl.GetError(); e != gl.NO_ERROR {
+		panic(fmt.Sprintf("check failed: %d", e))
+	}
+}
+
 func (c *Context) NewTexture(width, height int, pixels []uint8, filter Filter) (Texture, error) {
 	gl := c.gl
 	t := gl.CreateTexture()