Re: [Plib-devel] Texture and blend modes

[Sam S. <sa...@sp...>]

----- Original Message -----
From: "Steve Baker" <sjb...@ai...>
To: <pli...@li...>
Sent: Friday, August 18, 2000 6:38 PM
Subject: Re: [Plib-devel] Texture and blend modes


> Sam Stickland wrote:-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1

- ----- Original Message -----
From: "Steve Baker" <sjb...@ai...>
To: <pli...@li...>
Sent: Friday, August 18, 2000 6:38 PM
Subject: Re: [Plib-devel] Texture and blend modes


> Sam Stickland wrote:
>
> > How are these specified in ssg?  I'll take a wild guess that ssg
> > doesn't manage texture environment modes (GL_MODULATE, GL_DECAL
> > etc.) at all, and it only cares whether blending is on or off.
>
> Well, when you add a texture into an ssgSimpleState, you can either
> pass it an 'ssgTexture' or an OpenGL texture handle - or even a
> filename (which will result in an ssgTexture being constructed on
> your behalf).

Oh wait, I'll look lame for saying this but I genuinely thought that
glTexEnv didn't get caught up in the glBindTexture bit?

The results from glTexEnv depend on what surface you render onto, not
just the texture so I thought it effected the "global" rendering mode
- - hence I believed this sort of stuff was planned for:

glBindTexture(blah);
glTexEnvf(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE);
/* Render surface */
glTexEnvf(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_DECAL);
/* Render another surface */

Oh well..

>
> 5) Edit the SSG source code to add 'setEnvMode/getEnvMode' methods
> to ssgTexture - then
>    contribute your change via CVS and earn fame, the recognition of
> your peers, etc, etc.

And Beer?

>    While you are about it - add Mag/Min filter and texture wrap
> options.
>
> People who know me well soon realise that I ALWAYS put my most
> favored option at the end of a list of choices.  :-)

Guess I'll do this one then. :)

Oh, how do you set the glBendFunc ?  (Meant to ask this in the
original email but forgot).

Thanks,

Sam

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>
> > How are these specified in ssg?  I'll take a wild guess that ssg
> > doesn't manage texture environment modes (GL_MODULATE, GL_DECAL etc.)
> > at all, and it only cares whether blending is on or off.
>
> Well, when you add a texture into an ssgSimpleState, you can either
> pass it an 'ssgTexture' or an OpenGL texture handle - or even a
> filename (which will result in an ssgTexture being constructed on
> your behalf).

Oh wait, I'll look lame for saying this but I genuinely thought that glTexEnv didn't get caught up in the glBindTexture bit?

The results from glTexEnv depend on what surface you render onto, not just the texture so I thought it effected the "global"
rendering mode - hence I believed this sort of stuff was planned for:

glBindTexture(blah);
glTexEnvf(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE);
/* Render surface */
glTexEnvf(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_DECAL);
/* Render another surface */

Oh well..

>
> 5) Edit the SSG source code to add 'setEnvMode/getEnvMode' methods to ssgTexture - then
>    contribute your change via CVS and earn fame, the recognition of your peers, etc, etc.

And Beer?

>    While you are about it - add Mag/Min filter and texture wrap options.
>
> People who know me well soon realise that I ALWAYS put my most favored option
> at the end of a list of choices.  :-)

Guess I'll do this one then. :)

Oh, how do you set the glBendFunc ?  (Meant to ask this in the original email but forgot).

Thanks,

Sam