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gwt: throw on missing GL context

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This commit is contained in:
Hannes Janetzek 2014-05-28 15:30:10 +02:00
parent 480d639def
commit ee5e6b511e
1 changed files with 9 additions and 2 deletions
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11
vtm-web/src/org/oscim/gdx/emu/com/badlogic/gdx/backends/gwt/GwtGraphics.java
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@ -17,6 +17,8 @@
package com.badlogic.gdx.backends.gwt;
import org.oscim.gdx.client.GwtGLAdapter;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import com.badlogic.gdx.Gdx;
import com.badlogic.gdx.Graphics;
@ -32,6 +34,8 @@ import com.google.gwt.webgl.client.WebGLContextAttributes;
import com.google.gwt.webgl.client.WebGLRenderingContext;
public class GwtGraphics implements Graphics {
static final Logger log = LoggerFactory.getLogger(GwtGraphics.class);
CanvasElement canvas;
WebGLRenderingContext context;
GL20 gl;
@ -73,15 +77,18 @@ public class GwtGraphics implements Graphics {
attributes.setPremultipliedAlpha(false);
context = WebGLRenderingContext.getContext(canvas, attributes);
if (context == null)
throw new GdxRuntimeException("Could not create Canvas for " + attributes);
context.viewport(0, 0, config.width, config.height);
// this actually *enables* the option to use std derivatives in shader..
if (context.getExtension("OES_standard_derivatives") == null) {
log.error("Missing gl extension for OES_standard_derivatives");
}
if (context.getExtension("WEBKIT_WEBGL_depth_texture") == null) {
log.error("Missing gl extension for WEBKIT_WEBGL_depth_texture");
}
this.gl = config.useDebugGL ? new GwtGL20Debug(context) : new GwtGLAdapter(context);