Trying to make use of alpha buffer for dst blends, I added GLUT_ALPHA to window initialization.
glutInitDisplayMode( GLUT_ALPHA | GLUT_DEPTH | GLUT_RGB | GLUT_DOUBLE );
this however resulted into the application performing extremely slow. And eventually my querys for GL_Extensions all fail. had to bypass to make the app work at all, but it felt like software mode
used a geforce4 and w2k to test
Anyone had similar experiences with ALPHA buffer ? or any idea what could be going wrong.
I tried other buffers (accum, stencil) and those worked fine
some more testing: ALPHA works well if running in fullscreen-gamemode, but not if running windowed.
thx for your time