[Openal-devel] Transformation by matrices
Alexandre at OzEmail.com.au
Tue Apr 19 23:12:43 PDT 2005
On 20/04/2005, at 2:06 PM, Alexandre Mah wrote:
> This would also greatly help OpenAL's integration with OpenGL, since
> you could then just simply query OpenGL's GL_MODELVIEW matrix, then
> call alLoadMatrix(), and thereafter be able to use the exact same
> positional data from OpenGL in OpenAL.
This is just a correction to my previous email.
Actually, OpenGL's GL_MODELVIEW matrix corresponds to just the OpenAL
transformations involving AL_POSITION, AL_ORIENTATION, and any
modelling transformations in OpenAL.
The transformations corresponding to AL_REFERENCE_DISTANCE and AL_GAIN
may need to go into a separate matrix (perhaps something akin to
OpenGL's GL_PROJECTION matrix), or alternatively simply have these
transformations loaded into the AL_POSITION_TRANSFORM matrix before
being multiplied by the GL_MODELVIEW matrix.
Currently, OpenGL can do things like recursive modelling (with its
matrix support), which OpenAL cannot do easily. I'd love to see OpenAL
gain the ability to integrate nicely with OpenGL programs that do
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