add PowerPreference option

backends/backend-teavm/src/main/java/com/github/xpenatan/gdx/backends/teavm/TeaApplicationConfiguration.java

@@ -89,6 +89,11 @@ public class TeaApplicationConfiguration {
      * return value of {@link TeaApplication#isMobileDevice()} . */
     public boolean usePhysicalPixels = true;
 
+    /**
+     * default, low-power or high-performance
+     */
+    public String powerPreference = "high-performance";
+
     public boolean isFixedSizeApplication() {
         return width != 0 && height != 0;
     }

backends/backend-teavm/src/main/java/com/github/xpenatan/gdx/backends/teavm/TeaGraphics.java

@@ -18,6 +18,7 @@
 import com.github.xpenatan.gdx.backends.teavm.dom.StyleWrapper;
 import com.github.xpenatan.gdx.backends.teavm.dom.impl.TeaWindow;
 import com.github.xpenatan.gdx.backends.teavm.gl.WebGL2RenderingContextWrapper;
+import com.github.xpenatan.gdx.backends.teavm.gl.WebGLContextAttributesWrapper;
 import com.github.xpenatan.gdx.backends.teavm.gl.WebGLRenderingContextWrapper;
 import org.teavm.jso.JSBody;
 import org.teavm.jso.JSFunctor;
@@ -50,12 +51,13 @@ public TeaGraphics(TeaApplicationConfiguration config) {
         HTMLElementWrapper elementID = document.getElementById(config.canvasID);
         this.canvas = (HTMLCanvasElementWrapper)elementID;
 
-        WebGLContextAttributes attr = WebGLContextAttributes.create();
+        WebGLContextAttributesWrapper attr = WebGLContextAttributesWrapper.create();
         attr.setAlpha(config.alpha);
         attr.setAntialias(config.antialiasing);
         attr.setStencil(config.stencil);
         attr.setPremultipliedAlpha(config.premultipliedAlpha);
         attr.setPreserveDrawingBuffer(config.preserveDrawingBuffer);
+        attr.setPowerPreference(config.powerPreference);
         HTMLCanvasElement canvas1 = (HTMLCanvasElement)canvas;
 
         if (config.useGL30) {

backends/backend-teavm/src/main/java/com/github/xpenatan/gdx/backends/teavm/gl/WebGLContextAttributesWrapper.java

@@ -1,33 +1,52 @@
 package com.github.xpenatan.gdx.backends.teavm.gl;
 
+import org.teavm.jso.JSBody;
 import org.teavm.jso.JSObject;
+import org.teavm.jso.JSProperty;
 
 /**
  * @author xpenatan
  */
-public interface WebGLContextAttributesWrapper extends JSObject {
-    // WebGLContextAttributes
-    boolean getAlpha();
+public abstract class WebGLContextAttributesWrapper implements JSObject {
+    @JSProperty
+    public abstract boolean isAlpha();
 
-    void setAlpha(boolean alpha);
+    @JSProperty
+    public abstract void setAlpha(boolean alpha);
 
-    boolean getDepth();
+    @JSProperty
+    public abstract boolean isDepth();
 
-    void setDepth(boolean depth);
+    @JSProperty
+    public abstract void setDepth(boolean depth);
 
-    boolean getStencil();
+    @JSProperty
+    public abstract boolean isScencil();
 
-    void setStencil(boolean stencil);
+    @JSProperty
+    public abstract void setStencil(boolean stencil);
 
-    boolean getAntialias();
+    @JSProperty
+    public abstract boolean isAntialias();
 
-    void setAntialias(boolean antialias);
+    @JSProperty
+    public abstract void setAntialias(boolean antialias);
 
-    boolean getPremultipliedAlpha();
+    @JSProperty
+    public abstract boolean isPremultipliedAlpha();
 
-    void setPremultipliedAlpha(boolean premultipliedAlpha);
+    @JSProperty
+    public abstract void setPremultipliedAlpha(boolean premultipliedAlpha);
 
-    boolean getPreserveDrawingBuffer();
+    @JSProperty
+    public abstract boolean isPreserveDrawingBuffer();
 
-    void setPreserveDrawingBuffer(boolean preserveDrawingBuffer);
+    @JSProperty
+    public abstract void setPreserveDrawingBuffer(boolean preserveDrawingBuffer);
+
+    @JSProperty
+    public abstract void setPowerPreference(String powerPreference);
+
+    @JSBody(script = "return {};")
+    public static native WebGLContextAttributesWrapper create();
 }