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Hi,<br>
<br>
<div class="moz-cite-prefix">On 6/5/21 9:40 pm, Yu You via
gstreamer-devel wrote:<br>
</div>
<blockquote type="cite"
cite="mid:CAB+yMgsRqMewbDXdS8CqztSMU5W1qZkrLjZwQKBWA1-OHTgVWQ@mail.gmail.com">
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<div dir="ltr">Hi,
<div><br>
</div>
<div>There's a way to modify uniform variables for the glshader
element.</div>
<div>The following is an example of changing simple value types
like float.</div>
<div><br>
</div>
<div><br>
</div>
<div> uniforms = Gst.Structure.new_empty("uniforms")<br>
u1 = GObject.Value(GObject.TYPE_FLOAT)<br>
</div>
u1.set_float(hdegree)<br>
uniforms.set_value("u1", u1)
<div> shader.set_property("uniforms", uniforms)<br>
uniforms.free()<br>
</div>
<div><br>
</div>
<div>But it is common in GLSL shader we use data types like
Vec2/Vec3.</div>
<div>The following code did not work.</div>
<div> v1 = Graphene.Vec2()<br>
v1.init(0.5,0.5)<br>
uniforms.set_value("v1", v1)<br>
</div>
<div><br>
</div>
<div>Should I create GObject.Value() with GObject.TYPE_??
for Graphene.Vec2?</div>
<div>How to set the Graphene.Vec2 object to the GObject.Value?</div>
</div>
</blockquote>
<br>
This may depend on if your GStreamer GL set up was built with
graphene enabled at compile time<br>
<br>
The code is definitely there for this: <a moz-do-not-send="true"
href="https://gitlab.freedesktop.org/gstreamer/gst-plugins-base/-/blob/master/ext/gl/gstglfiltershader.c#L365">https://gitlab.freedesktop.org/gstreamer/gst-plugins-base/-/blob/master/ext/gl/gstglfiltershader.c#L365</a>.<br>
<br>
Setting GST_DEBUG=3 in the environment will get you the GST_FIXME
below if the glshader element doesn't understand the GValue's type.<br>
<br>
Cheers<br>
-Matt<br>
<br>
<blockquote type="cite"
cite="mid:CAB+yMgsRqMewbDXdS8CqztSMU5W1qZkrLjZwQKBWA1-OHTgVWQ@mail.gmail.com">
<div dir="ltr">
<div><br>
</div>
<div>Thanks.</div>
<div><br>
</div>
<div>Regards,</div>
<div><br>
</div>
<div>Yu</div>
<div><br>
</div>
<div> </div>
</div>
<br>
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</blockquote>
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