Re: [gl4java-usergroup] GC Bug

[Sven G. <sgo...@ja...>]

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On Tuesday 08 January 2002 18:02, Pepijn Van Eeckhoudt wrote:
> In the red book (1.2 third edition) on page 482 second paragraph, it is
> stated that only a pointer is kept inside the tesselator :). The
> tesselator kicks in when you call glTessEndPolygon. My suggestion would
> be to copy the data that is passed in glTessVertex calls, and to free it
> after glTessEndPolygon has returned. I modified my program so it uses
> direct buffers and this works fine. If I keep the exact same code, but
> pass a double[] it's messed up again, so the problem isn't in my program.
>
> Pepijn Van Eeckhoudt

thx ..

for the next future, we need to support many more NIO Buffer functions, true !

so you are welcome to add such NIO support to the manuall coded one,
like you suggested e.g. for GLU functions ..

you can find such manual codes within the GL4Java/C2J/manual directory !

then we need some new functions within the:
	gl4java/GLUFunc14.java (interface)
		C2J/manual/glu-manualCodedVirt-14.java (manual part)

	gl4java/GLUFunc14JauJNI.java (implementation - JNI declarations and stubs ..)
		C2J/manual/glu-manualCodedImplJNI1-14.java (manual part)

	CNativeCode/OpenGLU_JauJNI14_funcs.c (native implementation)
		C2J/manual/glu-manualCodedImplJNI14.c (manual part)

just have a look - and understand, how it is done within the 
manual GLFunc14* counterpart of the NV extension ..:

GL4Java/C2J/manual:
	gl-manualCodedImplJNI1-14.java  gl-manualCodedImplJNI14.c  gl-manualCodedVirt1-14.java

we might want to make the memory managment functions more general purpose,
so we can use them for e.g. (as you suggested)
	- glTessVertex
		- we should create a native NIO buffer which will be used ..,
		straight outta the java application, 
		or by a new general purpose GL4Java utility function ..

		- all passed NIO buffers might be freed by the glTessEndPolygon function
		or by another one .. if allocated by a GL4Java utility function

	- glTessEndPolygon
		- might free all passed NIO buffers, if allocated by a GL4Java utility function

so this little concept - please review and make it more clean RFC ..,
might be introduced to all OpenGL functions which handles a big amount of data,
e.g. textures etc., where the JVM's GC might moves or cleans the memory ..

cheers, sven
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