Cube Mapping

The GLSL mat3 constructor that is supposed to take a mat4 and slice out the upper 3x3 doesn't work on my MacBook Pro. Apparently I'm not the only one. http://emergencyexit.untergrund.net/2007/12/glsl/

As described in the above url, you can use the following instead:

mat3(matrix[0].xyz, matrix[1].xyz, matrix[2].xyz)

gl_NormalMatrix

I've run into a few driver problems under OS X

For comparison, here are my system specs:
Mac OS X Version 10.5.2
Processor: 1.5 GHz PowerPC G4
Memory 512 MB DDR SDRAM

gl_NormalMatrix is computed incorrectly on my mac.
The problem, and a temporary solution are listed below.

frag_Normal = gl_NormalMatrix * gl_Normal

frag_Normal = (gl_ModelViewMatrix * vec4(gl_Normal, 0.0)).xyz

Framebuffer objects must be powers of two.

More to come.