I misread the original query- thought the question was about about
writing GLSL shader code inside a standard QC GLSL patch, rather than
writing a custom patch as a plugin for the application. Please ignore
my previous email if it's not relevant.
a|x
On 7 May 2010, at 14:20, Christopher Wright wrote:
Is it possible to invert the process? I mean: is it possible to
write a custom OpenGL macro M that receives vertices from the
OpenGL-patches inside it? For example, if I render a quad Q with
LG Quad kineme patch and put it into M, is it possible to 'catch'
Q vertices inside the custom macro M and shade them as I want? One
possible use of this process is a possible shadow-mapping
implementation..
In QC, there's no supported way to create a custom patch that
allows subpatches. So there's no way to create M right now.
Outside of QC, the only way to capture vertices that I'm aware of
is to use the Transform Feedback extension. That should allow you
to "record" vertices for later reuse. (This is also handy to
filter a mesh through multiple vertex shaders, for example).
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