Re: SuperDevMode and same origin policy

Hi Thomas,

Thanks for you answer.

Following your suggestion ( new Image(myImageResource) ), there is no more security error :)

All my textures are loaded but are almost empties. According to WebGLInspector all textures have size 1x1 with a transparent pixel.

It looks like that the HTMLImageElement obtained via image.getElement() is not properly filled now.

An idea about that ? 

Regards, 

Harold

2013/3/4 Thomas Broyer <t.broyer@gmail.com>

On Sunday, March 3, 2013 10:52:29 PM UTC+1, Harold wrote:

Hi all,

I am using super dev mode and i have an issue, i think,, with same origin policy.

I have a ClientBundle containing many ImageResource which will be used as WebGL textures.

To load those images i do :

Image image = new Image(myImageResource.getSafeUri().asString();

Don't do that. Use new Image(myImageResource), or use a DataResource.

 

RootLayoutPanel.get().add(image);

image.setVisible(false);

this.img.addLoadHandler(this);

this.img.addErrorHandler(this);

where this is a class implenting LoadHandler and ErrorHandler.

Then in the onLoad method :

this.InitializeTexture(this.img.getElement());

RootLayoutPanel.get().remove(this.img);

And finally the InitializeTexture :

/**

* \brief Initializes the gl texture with the loaded image.

*/

public void InitializeTexture(Element inElement)

{

        // Set current texture object as active

this.Bind(WebGLRenderingContext.TEXTURE_2D);

// If generating mipmap is requested, parameter the texture filtering to using them and generate mipmaps ...

if(this.generateMipmap)

{

this.gl.texParameteri(WebGLRenderingContext.TEXTURE_2D, WebGLRenderingContext.TEXTURE_MAG_FILTER, WebGLRenderingContext.LINEAR);

this.gl.texParameteri(WebGLRenderingContext.TEXTURE_2D, WebGLRenderingContext.TEXTURE_MIN_FILTER, WebGLRenderingContext.LINEAR_MIPMAP_NEAREST);

this.gl.generateMipmap(WebGLRenderingContext.TEXTURE_2D);

}

else // else do not use mipmap

{

this.gl.texParameteri(WebGLRenderingContext.TEXTURE_2D, WebGLRenderingContext.TEXTURE_MAG_FILTER, WebGLRenderingContext.LINEAR);

this.gl.texParameteri(WebGLRenderingContext.TEXTURE_2D, WebGLRenderingContext.TEXTURE_MIN_FILTER, WebGLRenderingContext.LINEAR);

}

this.gl.texParameteri(WebGLRenderingContext.TEXTURE_2D, WebGLRenderingContext.TEXTURE_WRAP_S, WebGLRenderingContext.CLAMP_TO_EDGE);

this.gl.texParameteri(WebGLRenderingContext.TEXTURE_2D, WebGLRenderingContext.TEXTURE_WRAP_T, WebGLRenderingContext.CLAMP_TO_EDGE);

// And finaly, set the image pixels data in the texture object.

this.gl.texImage2D(WebGLRenderingContext.TEXTURE_2D, 0, WebGLRenderingContext.RGBA, WebGLRenderingContext.RGBA, WebGLRenderingContext.UNSIGNED_BYTE, inElement);

// Finaly unbind the texture object

this.Unbind(WebGLRenderingContext.TEXTURE_2D);

}

All is ok in production mode but when i use superdevmode i get under chrome and firefox a security error while calling texImage2D method.

Do you think that is a SOP issue ?

See http://www.w3.org/html/wg/drafts/html/master/embedded-content-0.html#security-with-canvas-elements

Though SuperDevMode sends "Access-Control-Allow-Origin: *" so it should work…

 

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Small WebGL 3D engine for GWT

http://code.google.com/p/ethereal-engine/

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