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Default vertex color with alpha blending and GU_TFX_MODULATE

 
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PlayfulPuppy



Joined: 05 May 2006
Posts: 22
PostPosted: Fri May 05, 2006 12:28 am    Post subject: Default vertex color with alpha blending and GU_TFX_MODULATE Reply with quote
Okay, after a lot of experimentation and head bashing I've finally got alpha transparencies working with lighting enabled using the following code:

Code:

      sceGuAmbient(0xFF000000);
      sceGuLightColor(0, GU_DIFFUSE, 0xFFFFFFFF);
      sceGuEnable(GU_LIGHTING);
      sceGuEnable(GU_LIGHT0);

      sceGuEnable(GU_TEXTURE_2D);
      sceGuEnable(GU_BLEND);

[snip...]

      sceGuLight(0, GU_POINTLIGHT, GU_DIFFUSE, (ScePspFVector3*)&m_pCamera->GetWorldMatrix().GetRow(3));

[snip...]

      sceGuTexFunc(GU_TFX_MODULATE, GU_TCC_RGBA);
      sceGuBlendFunc(GU_ADD, GU_SRC_ALPHA, GU_ONE_MINUS_SRC_ALPHA, 0, 0);


(For other people bashing their heads trying to get alpha transparencies working with lighting enabled, keep in mind that GU_TFX_MODULATE also works off the alpha values from lights. Make sure all your lights have an alpha of FF, and make sure you set the global ambient color to FF. Note that using lights with GU_AMBIENT_DIFFUSE doesn't appear to work)

Anyways, now onto the current problem. When I render my models, I need to have vertex colors set (GU_COLOR_XXXX in the vertex format) or my model doesn't appear with the above blending/color settings. The reason for this appears to be that the PSP is assuming that if there's no vertex color, the color is 0 (Note with blending disabled, the model turns black, so I'm about 99% sure this is the case).

I was just wondering, is there a way to set what the default vertex color for a mesh should be if GU_COLOR_XXXX isn't applied? I'd prefer to save the 4 bytes per vertex, as most if not all of the meshes in my project won't be using anything other than 0xFFFFFFFF and it seems like a waste.

Thanks guys.
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PlayfulPuppy



Joined: 05 May 2006
Posts: 22
PostPosted: Fri May 05, 2006 12:41 am    Post subject: Reply with quote
Note I also tried out sceGuColor(0xFFFFFFFF), and that didn't seem to work. Would appear that value gets stomped somewhere by... something.
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sandberg



Joined: 05 Oct 2005
Posts: 90
Location: Denmark
PostPosted: Fri May 05, 2006 12:57 am    Post subject: Reply with quote
Have you tried sceGuTexEnvColor ? Not sure it'll do the job, but since you have texturing enabled it might.
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Br, Sandberg
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PlayfulPuppy



Joined: 05 May 2006
Posts: 22
PostPosted: Fri May 05, 2006 8:52 am    Post subject: Reply with quote
Yep, tried that too. No dice. :\
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chp



Joined: 23 Jun 2004
Posts: 313
PostPosted: Fri May 05, 2006 4:53 pm    Post subject: Reply with quote
sceGuTexEnvColor() only specifies the constant color for the GU_TFX_BLEND texture effect, nothing else. (just like for opengl)
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GE Dominator
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