internal/ui: add graphicsDriverGetter.getDirectX()

Updates #1007

internal/ui/graphics.go

@@ -24,6 +24,7 @@ import (
 type graphicsDriverGetter interface {
 	getAuto() graphicsdriver.Graphics
 	getOpenGL() graphicsdriver.Graphics
+	getDirectX() graphicsdriver.Graphics
 	getMetal() graphicsdriver.Graphics
 }
 
@@ -41,6 +42,11 @@ func chooseGraphicsDriver(getter graphicsDriverGetter) (graphicsdriver.Graphics,
 			return g, nil
 		}
 		return nil, fmt.Errorf("ui: %s=%s is specified but OpenGL is not available", envName, env)
+	case "directx":
+		if g := getter.getDirectX(); g != nil {
+			return g, nil
+		}
+		return nil, fmt.Errorf("ui: %s=%s is specified but DirectX is not available.", envName, env)
 	case "metal":
 		if g := getter.getMetal(); g != nil {
 			return g, nil

internal/ui/ui_android.go

@@ -34,6 +34,10 @@ func (*graphicsDriverGetterImpl) getOpenGL() graphicsdriver.Graphics {
 	return nil
 }
 
+func (*graphicsDriverGetterImpl) getDirectX() graphicsdriver.Graphics {
+	return nil
+}
+
 func (*graphicsDriverGetterImpl) getMetal() graphicsdriver.Graphics {
 	return nil
 }

internal/ui/ui_cbackend.go

@@ -38,6 +38,10 @@ func (*graphicsDriverGetterImpl) getOpenGL() graphicsdriver.Graphics {
 	return nil
 }
 
+func (*graphicsDriverGetterImpl) getDirectX() graphicsdriver.Graphics {
+	return nil
+}
+
 func (*graphicsDriverGetterImpl) getMetal() graphicsdriver.Graphics {
 	return nil
 }

internal/ui/ui_glfw_darwin.go

@@ -248,6 +248,10 @@ func (*graphicsDriverGetterImpl) getOpenGL() graphicsdriver.Graphics {
 	return nil
 }
 
+func (*graphicsDriverGetterImpl) getDirectX() graphicsdriver.Graphics {
+	return nil
+}
+
 func (*graphicsDriverGetterImpl) getMetal() graphicsdriver.Graphics {
 	if m := metal.Get(); m != nil {
 		return m

internal/ui/ui_glfw_unix.go

@@ -44,6 +44,10 @@ func (*graphicsDriverGetterImpl) getOpenGL() graphicsdriver.Graphics {
 	return nil
 }
 
+func (*graphicsDriverGetterImpl) getDirectX() graphicsdriver.Graphics {
+	return nil
+}
+
 func (*graphicsDriverGetterImpl) getMetal() graphicsdriver.Graphics {
 	return nil
 }

internal/ui/ui_glfw_windows.go

@@ -42,6 +42,10 @@ func (*graphicsDriverGetterImpl) getOpenGL() graphicsdriver.Graphics {
 	return nil
 }
 
+func (*graphicsDriverGetterImpl) getDirectX() graphicsdriver.Graphics {
+	return nil
+}
+
 func (*graphicsDriverGetterImpl) getMetal() graphicsdriver.Graphics {
 	return nil
 }

internal/ui/ui_ios.go

@@ -41,6 +41,10 @@ func (*graphicsDriverGetterImpl) getOpenGL() graphicsdriver.Graphics {
 	return nil
 }
 
+func (*graphicsDriverGetterImpl) getDirectX() graphicsdriver.Graphics {
+	return nil
+}
+
 func (g *graphicsDriverGetterImpl) getMetal() graphicsdriver.Graphics {
 	// When gomobile-build is used, GL functions must be called via
 	// gl.Context so that they are called on the appropriate thread.

internal/ui/ui_js.go

@@ -38,6 +38,10 @@ func (*graphicsDriverGetterImpl) getOpenGL() graphicsdriver.Graphics {
 	return nil
 }
 
+func (*graphicsDriverGetterImpl) getDirectX() graphicsdriver.Graphics {
+	return nil
+}
+
 func (*graphicsDriverGetterImpl) getMetal() graphicsdriver.Graphics {
 	return nil
 }