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porting from sceGu openGL: help drawing Vertex arrays.

 
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snowsquirrel



Joined: 24 Feb 2008
Posts: 51
PostPosted: Mon Apr 28, 2008 10:55 am    Post subject: porting from sceGu openGL: help drawing Vertex arrays. Reply with quote
Trying to port my GU and GUM code to open GL. Most of the calls seem to map pretty well, but have a bit of trouble with my code for rendering a model.

I had this:
Code:

   sceGumMatrixMode( GU_MODEL );
   sceGumLoadIdentity();
   sceGumTranslate( &pos );

   //set texture environment
   sceGuTexMode( GU_PSM_8888, 0, 0, 0 );
   sceGuTexFunc( GU_TFX_REPLACE, GU_TCC_RGB );
   sceGuTexFilter( GU_LINEAR, GU_LINEAR );
   sceGuTexScale( 1.0f, 1.0f );
   sceGuTexOffset( 0.0f, 0.0f );

   for( int i=0; i < _numParts; i++ )
   {
      sceGuTexImage( 0,
         _parts[i].texture->textureWidth,
         _parts[i].texture->textureHeight,
         _parts[i].texture->textureWidth,
         (void*)_parts[i].texture->data );
      sceGumDrawArray( _renderMode, _renderFlags, _parts[i].numVerts, 0, _parts[i].vertex );
   }


My port currently looks like this:
Code:


   glMatrixMode( GL_MODELVIEW );
   glLoadIdentity();
   glTranslatef( v3_expand(pos) );

   glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR );
   glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR );
   glTexParameteri( GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_REPLACE );

   //sceGuTexScale( 1.0f, 1.0f ); // opengl version?
   //sceGuTexOffset( 0.0f, 0.0f ); // opengl version?
   glTexCoord( 0.0f, 0.0f );

   for( int i=0; i < _numParts; i++ )
   {
      //gen texture and bind them?
      glTexImage2d(
            GL_TEXTURE_2D,
            0,
            4, // num color components?
            parts[i].texture->textureWidth,
            parts[i].texture->textureHeight,
            0,
            GL_RGBA,
            GL_UNSIGNED_BYTE,
            (void*)_parts[i].texture->data );

      glVertexPointer( 3, GL_FLOAT, sizeof(Vertex) - sizeof(Vector3d), &(_parts[i].vertex[0].coord) );
      glTexCoordPoint( 2, GL_FLOAT, sizeof(Vertex) - sizeof(float)*2, &(_parts[i].vertex[0].u) );
      glNormalPointer( GL_FLOAT, sizeof(Vertex) - sizeof(Vector3d), &(_parts[i].vertex[0].normal) );
      glColorPointer( 4, GL_UNSIGNED_BYTE, sizeof(Vertex) - 4, &(_parts[i].vertex[0].color) );
      glDrawArrays( GL_TRIANGLES, 0, _parts[i].numVerts );
   }


Do I have to do a glTexGen, and glTexBind to make the glTexImage2d work?
How does that drawing look?

In the middle of porting so code is not building at this momemnt.

Thanks for the help.

~S
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bootdisk



Joined: 29 Apr 2008
Posts: 6
PostPosted: Tue Apr 29, 2008 12:08 am    Post subject: Reply with quote
I don't know if this might be useful, but maybe looking at some psp emulators will help your porting the code.

And maybe using GLIntercept (http://www.opengl.org/sdk/tools/GLIntercept/) would let you know what your code is doing.

Regards,
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snowsquirrel



Joined: 24 Feb 2008
Posts: 51
PostPosted: Tue Apr 29, 2008 12:13 am    Post subject: Reply with quote
I would hope I don't have to go that deep. I am assuming this is pretty standard stuff I am doing, and that anyone who knows opengl would know the answer too. What is a decent PSP emulator?
~S
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quadrizo



Joined: 23 Aug 2007
Posts: 21
PostPosted: Tue Apr 29, 2008 12:27 am    Post subject: Reply with quote
you'd look at this tutorial : http://nehe.gamedev.net/data/lessons/lesson.asp?lesson=06
but in general you init a texture with :

Code:
      
glGenTextures(1, &texture);
glBindTexture(GL_TEXTURE_2D, texture);
glTexImage2D(GL_TEXTURE_2D,...


and use it with :
Code:
      
glBindTexture(GL_TEXTURE_2D, texture);
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snowsquirrel



Joined: 24 Feb 2008
Posts: 51
PostPosted: Tue Apr 29, 2008 8:27 am    Post subject: Reply with quote
Thanks, for the reply.

Does binding the texture move it into vram? i.e, can I free the texture data from user memory after I am done gen/binding it? If so, is there a way to do the same with Ge?

Thanks,
~S
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fungos



Joined: 31 Oct 2007
Posts: 41
Location: cwb br
PostPosted: Tue Apr 29, 2008 9:59 am    Post subject: Reply with quote
About OpenGL, yes, binding a texture copy it to vga ram and you can safely free your resource (if you will not need load it again later).

About gu/gum I don't know, sorry.
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snowsquirrel



Joined: 24 Feb 2008
Posts: 51
PostPosted: Sun May 04, 2008 2:56 am    Post subject: Reply with quote
Anyone know when the opengl equivilant of sceGuOffset(x,y)?
~S
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Insert_witty_name



Joined: 10 May 2006
Posts: 376
PostPosted: Sun May 04, 2008 3:33 am    Post subject: Reply with quote
There's no need for the call in opengl.

In my emulator I have it stubbed in as:

Code:
void sceGuOffset(unsigned int x, unsigned int y)
{
   return;
}
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snowsquirrel



Joined: 24 Feb 2008
Posts: 51
PostPosted: Sun May 04, 2008 8:38 am    Post subject: Reply with quote
Is your emulator complete? Available for download? That might save me porting to OpenGL.
~S
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Insert_witty_name



Joined: 10 May 2006
Posts: 376
PostPosted: Sun May 04, 2008 8:54 am    Post subject: Reply with quote
It's purely an emulator for my PSP engine snowsquirrel.

All I do is provide opengl function counterparts for the sceGu* and other function calls.

It's not complete at this time.

I would advise taking this route instead of writing specific opengl and GU counterparts for each of your functions.

That way if you create a new drawing function, it would be supported by both build environments from the start.

I will gladly share my work with you if you want to see it, just drop me a PM as I think it's falling away from the scope of this forum.
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