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[SOLVED] Create screenshot using WebGL 2 MSAA and RenderTargetTexture ?


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Hi everybody !

First of all, I'm not sure if I should begin a new thread or up these ones :

With the new support of WebGL 2 by BabylonJS, I got interested in the multisample render target.
Until now, I used my own version of createScreenshotUsingRenderTarget() function which performs MSAA manually (actually, it pixel perfect downscales a 4x bigger renderTargetTexture than the requested size).
Now, I would like to rewrite it using the latest available features.

What should I do to get an antialiased screenshot using multisample render target ?

Just increasing the samples property of the RenderTargetTexture is not enough, I'll always get the following error :

[.Offscreen-For-WebGL-098CA170]GL ERROR :GL_INVALID_OPERATION : glReadPixels: 

Which comes obviously from this line :

var data = engine.readPixels(0, 0, width, height);


Here is a PG where I copy/pasted a lighter version of createScreenshotUsingRenderTarget() function. The only real difference is the sampleCount parameter which is used to increase the samples property :

Just press 1, 2, 3 or 4 key to call the createScreenshot() function with 1, 2, 3 or 4 samples.

Thanks for your help ! :)

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I just added a "samples" parameter to the createScreenshotUsingRenderTarget() function.

I see that the value is already checked in updateRenderTargetTextureSampleCount() and _setupFramebufferDepthAttachments() functions (value in [1, gl.MAX_SAMPLES] range) therefore no need to check it again.
So it's a one line change.

Or maybe did you intend to create a new screenshot function ?

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