graphicsdriver/opengl: Bug fix: compile error on browsers and mobiles

internal/graphicsdriver/opengl/context_mobile.go

@@ -75,14 +75,6 @@ type contextImpl struct {
 	worker mgl.Worker
 }
 
-func Init() {
-	theContext.gl, theContext.worker = mgl.NewContext()
-}
-
-func InitWithContext(context mgl.Context) {
-	theContext.gl = context
-}
-
 func (c *context) doWork(chError <-chan error, chDone <-chan struct{}) error {
 	if c.worker == nil {
 		panic("not reached")

internal/graphicsdriver/opengl/driver_js.go

@@ -17,9 +17,9 @@
 package opengl
 
 func (d *Driver) IsContextLost() bool {
-	return theContext.isContextLost()
+	return d.context.isContextLost()
 }
 
 func (d *Driver) RestoreContext() {
-	theContext.restoreContext()
+	d.context.restoreContext()
 }

internal/graphicsdriver/opengl/driver_mobile.go

@@ -16,6 +16,18 @@
 
 package opengl
 
+import (
+	"golang.org/x/mobile/gl"
+)
+
 func (d *Driver) DoWork(chError <-chan error, chDone <-chan struct{}) error {
-	return theContext.doWork(chError, chDone)
+	return d.context.doWork(chError, chDone)
+}
+
+func (d *Driver) Init() {
+	d.context.gl, d.context.worker = gl.NewContext()
+}
+
+func (d *Driver) InitWithContext(context gl.Context) {
+	d.context.gl = context
 }

internal/ui/ui_mobile.go

@@ -152,9 +152,9 @@ func Run(width, height int, scale float64, title string, g GraphicsContext, main
 
 	if mainloop {
 		ctx := <-glContextCh
-		opengl.InitWithContext(ctx)
+		opengl.GetDriver().InitWithContext(ctx)
 	} else {
-		opengl.Init()
+		opengl.GetDriver().Init()
 	}
 
 	// Force to set the screen size