Opengl help

[Homer_simpson]

ok i'm making a space game, I added a cockpit picture to be drawn on top of the background, i used masking with blending but i realized it significantly lowers fps rate.
any alternate ideas on how to render a cockpit on top of the background scene?

[CodeMonkey2000]

Did you try using a PNG with an alpha channel?

[md]

Textured quad with transparency, should be rather fast and easy to do. Positioning it might be a bit more of a challenge though.

[Homer_simpson]

CodeMonkey2000 @ Thu Jan 29, 2009 2:18 am wrote:

Did you try using a PNG with an alpha channel?

Homer_simpson wrote:

ok i'm making a space game, I added a cockpit picture to be drawn on top of the background, i used masking with blending but i realized it significantly lowers fps rate.
any alternate ideas on how to render a cockpit on top of the background scene?

those 2 are the same thing, and that is what i've done

[md]

Multiple textured quads without transparency?

[Homer_simpson]

never mind, alpha testing took care of it

load a transparent tga file and do this when drawing the cockpit:

c++:

glAlphaFunc(GL_GREATER,0.1f);         glEnable(GL_ALPHA_TEST);

Mod Edit: Language must be in quotations for the syntax tags, "cpp" not cpp