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Texture combine broken on Early Cards (Rage 128)

Subject: Texture combine broken on Early Cards (Rage 128)
From: "email@hidden" <email@hidden>
Date: Tue, 29 May 2007 14:15:58 -0400
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Anybody know why this doesn't work on early graphic cards (running at least OS X 1.3.9)?

glActiveTexture(GL_TEXTURE0); glEnable(GL_TEXTURE_2D); glBindTexture(GL_TEXTURE_2D,null_bitmap.gl_id); glTexEnvi(GL_TEXTURE_ENV,GL_TEXTURE_ENV_MODE,GL_COMBINE);

   glTexEnvi(GL_TEXTURE_ENV,GL_COMBINE_RGB,GL_MODULATE);
   glTexEnvi(GL_TEXTURE_ENV,GL_SOURCE0_RGB,GL_PRIMARY_COLOR);
   glTexEnvi(GL_TEXTURE_ENV,GL_OPERAND0_RGB,GL_SRC_COLOR);
   glTexEnvi(GL_TEXTURE_ENV,GL_SOURCE1_RGB,GL_CONSTANT);
   glTexEnvi(GL_TEXTURE_ENV,GL_OPERAND1_RGB,GL_SRC_COLOR);

   glTexEnvi(GL_TEXTURE_ENV,GL_COMBINE_ALPHA,GL_REPLACE);
   glTexEnvi(GL_TEXTURE_ENV,GL_SOURCE0_ALPHA,GL_CONSTANT);
   glTexEnvi(GL_TEXTURE_ENV,GL_OPERAND0_ALPHA,GL_SRC_ALPHA);

... the environment color is set before rendering:

   glTexEnvfv(GL_TEXTURE_ENV,GL_TEXTURE_ENV_COLOR,dark_fct);

... the null texture is just a dummy texture (actually 32x32 rgba black in this case.) This is just my tesseled lighting code which modulates the lighting with a per-polygon darkening factor.

If I just turn off texturing on the unit (and therefore skip the combines and just get the PRIMARY_COLOR, it works fine. I *think* combining is supported on this card (by the GL string), could it be the TEXTURE_ENV_COLOR, or is there just something about it not excepting the null texture?

[>] Brian
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