Lloyd A Treinish:
|I noticed an obscure feature the other day. In h/w rendering, if you
|request multi-pixel lines and opacity is not 1, then the lines are always
|rendered with single pixel width. If anyone is looking at the relevant
|code, it would occasionally be useful to do translucent, multi-pixel lines.
I think this is what needs to be done (not tested). This code in...
hwPortUtilOGL.c::_drawPrimitives():
case ct_lines / ct_polylines /ct_pline:
...
if(xf->attributes.linewidth > 0)
glLineWidth(xf->attributes.linewidth);
if(xf->attributes.aalines) {
glEnable(GL_LINE_SMOOTH);
glEnable(GL_BLEND);
glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
glHint(GL_LINE_SMOOTH_HINT, GL_DONT_CARE);
}
...
needs merged into corresponding switch cases in:
hwPortUtilOGL.c::_drawTranslucentPrimitives()
The BLEND mode is already on, and the correct BlendFunc is already set at
that point, so they can be skipped.
Randy
--
Randall Hopper (mailto:[EMAIL PROTECTED])
Lockheed Martin Operation Support
EPA Scientific Visualization Center
US EPA MD/24 ERC-1A; RTP, NC 27711
