> About those shaders. Have you actually tried to use the switching
> mechanism? Since I gues switching in shaders won't make it much
> faster(rather slower).
Oh, you mean if-statements and similar inside vertex and fragment shaders
? The performance depends _very much_ on the hardware.
But that is not necessary in your case - you could just have _different_
shaders prepared, and switch _the whole shader_ depending on the material
you want to render.
Yeah, that's what I meant, switching to a new fragment/vertex shader.
Replacing the two shaders with two different multiple times per model can't
be good for the framerate.
But i've not actually tested it, so i'm not sure.
> And another problem, how do I need to set those
> uniform variables for a whole model, using VBO's? I gues that's not
> possible, so I would almost need to make a VBO per mesh(or use that
> instancing).
No, uniform variables are set as attributes to the current shader, see
e.g.
http://developer.3dlabs.com/documents/GLmanpages/glUniform.htm
Yes, I knew that. But what I was trying to say was:
If I have my vertex, normal and texture coordinates stored in vertex buffer
objects, how can I make sure that the right values are sent to the shaders,
at the right time(because different parts of the model needs different
material properties)?
> Since i'm trying to make a game, I gues I don't have a real need for
> specular and diffuse color. I gues just goodlooking textures would be
> fine. But if you still have some ideas, please let me know.
a _game_ ? Well, on the contrary: then I guess shaders would improve the
game's looks a _lot_ :-)
I hope so :-p
Hylke
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