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Load and used some texture ? (3D gu)

 
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Poison_xtreamlua



Joined: 10 Aug 2007
Posts: 12
PostPosted: Thu May 15, 2008 6:23 am    Post subject: Load and used some texture ? (3D gu) Reply with quote
Hi there,

I'm programming a 3D homebrew (my first 3D homebrew :p) and I wonder if it's possible to load and use more than one texture, can we used 3 , 4 or 5 texture ? (I'm using this class to load texture : http://www.psp-programming.com/code/doku.php?id=c:pspgu-neheport-lesson5 ), and if it's possible how ?

Should I do this :

Code:

   texture1.LoadTGA("data/texture/intro.tga");
   texture1.Swizzle();

   texture2.LoadTGA("data/texture/intro.tga");
   texture2.Swizzle();

       //....some lines
   sceGuEnable(GU_TEXTURE_2D);

   sceGuTexMode(GU_PSM_8888, 0, 0, texture1.Swizzled());
   sceGuTexMode(GU_PSM_8888, 0, 0, texture2.Swizzled());
   sceGuTexFunc(GU_TFX_DECAL, GU_TCC_RGB);
   sceGuTexFilter( GU_LINEAR, GU_LINEAR );
   sceGuTexScale( 1.0f, 1.0f );
   sceGuTexOffset( 0.0f, 0.0f );


Or should I do this :

Code:

   texture1.LoadTGA("data/texture/intro.tga");
   texture1.Swizzle();

   texture2.LoadTGA("data/texture/intro.tga");
   texture2.Swizzle();

       //....some lines
   sceGuEnable(GU_TEXTURE_2D);

   sceGuTexMode(GU_PSM_8888, 0, 0, texture1.Swizzled());
   sceGuTexFunc(GU_TFX_DECAL, GU_TCC_RGB);
   sceGuTexFilter( GU_LINEAR, GU_LINEAR );
   sceGuTexScale( 1.0f, 1.0f );
   sceGuTexOffset( 0.0f, 0.0f );

   sceGuTexMode(GU_PSM_8888, 0, 0, texture2.Swizzled());
   sceGuTexFunc(GU_TFX_DECAL, GU_TCC_RGB);
   sceGuTexFilter( GU_LINEAR, GU_LINEAR );
   sceGuTexScale( 1.0f, 1.0f );
   sceGuTexOffset( 0.0f, 0.0f );


Thanks :)

NB : Is it possible to load a 512 *512 tga ? Because it seems to bug when I try to blit the texture,whereas when I load the same image but in 256 *256 it works perfectly ?

Thanks again
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quadrizo



Joined: 23 Aug 2007
Posts: 21
PostPosted: Thu May 15, 2008 8:33 am    Post subject: Reply with quote
of course you can use more than one texture

but it seems to me you confuse the loading and use

loading :
Code:

   texture1.LoadTGA("data/texture/intro.tga");
   texture1.Swizzle();

and use:
Code:

   sceGuEnable(GU_TEXTURE_2D);

   sceGuTexMode(GU_PSM_8888, 0, 0, texture1.Swizzled());
   sceGuTexImage(0, ..., (void*) texture1.data);
   sceGuTexFunc(GU_TFX_DECAL, GU_TCC_RGB);
   sceGuTexFilter( GU_LINEAR, GU_LINEAR );
   sceGuTexScale( 1.0f, 1.0f );
   sceGuTexOffset( 0.0f, 0.0f );
...
   sceGuDrawArray(....
...
  sceGuTexMode(GU_PSM_8888, 0, 0, texture2.Swizzled());
  sceGuTexImage(0, ..., (void*) texture2.data);
...
  sceGuDrawArray(....

sceGuTexFunc,sceGuTexMode,sceGuTexFilter,...are used to give parameters to apply to the texture

and size limits are 512x512.... maybe a bug in your code
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jsharrad



Joined: 20 Oct 2005
Posts: 102
PostPosted: Thu May 15, 2008 8:36 am    Post subject: Reply with quote
First one is fine provided you don't want different filtering / other texture options for each texture.

Getting errors when loading a 512x512 texture or not displaying correctly is probably because you're trying to load the whole thing into vram and there isn't enough vram left over after setting up the depth, draw, and display buffers for a texture that size (1mb).

If you're using 32 bit framebuffers, you only have about 700k vram left over.
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Poison_xtreamlua



Joined: 10 Aug 2007
Posts: 12
PostPosted: Thu May 15, 2008 4:25 pm    Post subject: Reply with quote
quadrizo -> Thanks , you have resolved one of my problem, I was programming with a wrong code ^^ .

jsharrad -> Thanks for those information :) , but how I know if I load textures in VRAM or in RAM ? And how to choose :p ?

Because RAM have an higher capacity than VRAM (I mean RAM is bigger than VRAM) ?

Thanks again ;)
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