On 2014/01/16 11:35, Bram Stolk wrote:
> After modifying the script a bit, I can see that
> MOZ_WEBGL_depth_texture is there.
> But the depth texture creation still fails.
> I found the console feature in firefox (I'm new to web dev) and saw
> this output:
>
> /11:30:34.395 [object WebGLExtensionDepthTexture] swaag.js:5923/
> /11:30:35.146 "ignoring setsockopt command" swaag.js:7672/
> /11:30:35.103 Error: WebGL: texImage2D: with format of
> DEPTH_COMPONENT or DEPTH_STENCIL target must be TEXTURE_2D, data
> must be nullptr, level must be zero/
>
>
> Modified script:
>
> / char req[] =/
> / "var ctx =
> Module.canvas.getContext('experimental-webgl');\n"/
> / "var wk_dt =
> ctx.getExtension('WEBKIT_WEBGL_depth_texture');\n"/
> / "var mz_dt =
> ctx.getExtension('MOZ_WEBGL_depth_texture');\n"/
> / "console.log( wk_dt );\n"/
> / "console.log( mz_dt );\n";/
> / emscripten_run_script(req);/
>
> I don't understand why it claims that data must be null pointer?
> I use this code on many different devices, yet WEBGL does not like it.
Because WEBGL_depth_texture
<http://www.khronos.org/registry/webgl/extensions/WEBGL_depth_texture/>
and ANGLE_depth_texture
<http://angleproject.googlecode.com/svn/trunk/extensions/ANGLE_depth_texture.txt>
on which it is based say they do not support loading image data via the
TexImage or TexSubImage commands. They do not give a reason, which is in
my view a flaw in the ANGLE_depth_texture's issues list.
A couple of notes on the script: WEBGL_depth_texture has been a ratified
extension since 2013.05. There should be no need to use WEBKIT and MOZ
prefixes any more; Several browsers have passed WebGL conformance so
getContext('webgl') should be tried before 'webgl-experimental'.
Regards
-Mark
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