Dynamic change of glshader element

[luc.deschenaux]

You could also initialize the uniform variables using text values (using GLSL
syntax) with something like
        g_object_set (G_OBJECT (glshader), "preset", str, NULL)

or change their value using text values with
        g_object_set (G_OBJECT (glshader), "vars", str, NULL)

See
https://bug600195.bugzilla-attachments.gnome.org/attachment.cgi?id=146619

But since this rely on the gst_gl_shader_set_uniform methods (with the
overhead implied for parsing the text string), calling the
gst_gl_shader_set_uniforms methods directly is more efficient for modifying
values dynamically.



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