SCEGU_VERTEX_SHORT

[su-27k]

Hi...
I've been doing basic procedure to draw primitive with short vertex,but after 2 days i don't know why it dosn't work

Code: Select all

typedef struct
{
	int		n;
	short  x,y,z,pad;
}	Vertex;


void Draw(){
if (mtx){PushMTx()}
		
	Vertex pVertex[3];
	pVertex[0].n=pVertex[1].n=pVertex[2].n=32756;
	pVertex[0].y=pVertex[1].y=pVertex[2].y= 0;

	pVertex[0].x=-3756;pVertex[0].z= 9527;
	pVertex[1].x= 3756;pVertex[1].z= 9527;
	pVertex[2].x=0;		 pVertex[2].z= 1000;
	sceGuDrawArray(SCEGU_PRIM_TRIANGLES, SCEGU_NORMAL_BYTE|SCEGU_VERTEX_FLOAT ,3, NULL, pVertex);

	if (mtx){
PopMtx();
	}
}

displaylist mode isn't in SCEGU_IMMEDIATE mode,so i havn't incoherency between DCACHE and memory.
if vertex type is FLOAT,the draw work good,so where i mistake?

thanke you and sorry for my english

[hlide]

Hi...

Code: Select all

	sceGuDrawArray(SCEGU_PRIM_TRIANGLES, SCEGU_NORMAL_BYTE|SCEGU_VERTEX_FLOAT ,3, NULL, pVertex);

SCEGU_VERTEX_FLOAT is definately wrong !

something like SCEGU_VERTEX_SHORT would probably be better :o)

[su-27k]

Hi...

Code: Select all

	sceGuDrawArray(SCEGU_PRIM_TRIANGLES, SCEGU_NORMAL_BYTE|SCEGU_VERTEX_FLOAT ,3, NULL, pVertex);

SCEGU_VERTEX_FLOAT is definately wrong !

something like SCEGU_VERTEX_SHORT would probably be better :o)

no asd :(
i have mistek to copy code.
my problem is

Code: Select all

typedef struct 
{ 
   int      n; 
   short  x,y,z,pad; 
}   Vertex; 


void Draw(){ 
if (mtx){PushMTx()} 
       
   Vertex pVertex[3]; 
   pVertex[0].n=pVertex[1].n=pVertex[2].n=32756; 
   pVertex[0].y=pVertex[1].y=pVertex[2].y= 0; 

   pVertex[0].x=-3756;pVertex[0].z= 9527; 
   pVertex[1].x= 3756;pVertex[1].z= 9527; 
   pVertex[2].x=0;       pVertex[2].z= 1000; 
   sceGuDrawArray(SCEGU_PRIM_TRIANGLES, SCEGU_NORMAL_BYTE|SCEGU_VERTEX_SHORT ,3, NULL, pVertex); 

   if (mtx){ 
PopMtx(); 
   } 
}

this code don't work and i don't know where is the problem -_-'''''

[su-27k]

Code: Select all

typedef struct 
{ 
   byte      nx,ny,nz;
   byte      pad;
   short     x,y,z; 
}   Vertex; 


void Draw(){ 
if (mtx){PushMTx()} 
        
   Vertex pVertex[3]; 
   pVertex[0].n=pVertex[1].n=pVertex[2].n=32756; 
   pVertex[0].y=pVertex[1].y=pVertex[2].y= 0; 

   pVertex[0].x=-3756;pVertex[0].z= 9527; 
   pVertex[1].x= 3756;pVertex[1].z= 9527; 
   pVertex[2].x=0;       pVertex[2].z= 1000; 
   sceGuDrawArray(SCEGU_PRIM_TRIANGLES, SCEGU_NORMAL_BYTE|SCEGU_VERTEX_SHORT ,3, NULL, pVertex); 

   if (mtx){ 
PopMtx(); 
   } 
}

i have changed some allinement but it dosen't work

[hlide]

pVertex.n = 0x7FF4 !? (32756)

are you sure about this value ?

what are values of nx, ny and nz exactly ?

it looks something like [-12, 128, 0] or even worse [0, 0, 128] probably because of little endianness of allegrex.

your source code doesn't fit with your last type definition of Vertex, do you know ? you should be more precise.

[su-27k]

pVertex.n = 0x7FF4 !? (32756)

are you sure about this value ?

what are values of nx, ny and nz exactly ?

it looks something like [-12, 128, 0] or even worse [0, 0, 128] probably because of little endianness of allegrex.

your source code doesn't fit with your last type definition of Vertex, do you know ? you should be more precise.

i know that my code dosn't fit my last definition of Vertex sorry but the problem is another.

SCEGU_VERTEX_SHORT indicate model coordinate to 16 bit fixed point,3756 fixed point is little,it's eugual to less then 1.

;)

[hlide]

i'm speaking about the normal vertex not the position vertex ! it doesn't fit your typedef Vertex. If you don't give the exact code, don't expect people to help you very much !

[su-27k]

i'm speaking about the normal vertex not the position vertex ! it doesn't fit your typedef Vertex. If you don't give the exact code, don't expect people to help you very much !

sorry and thanke you for help

next time i will be more careful

byezz :)