OpenGL ES-must use a native order direct Buffer Solution

OpenGL ES is similarCode:

1) create three vertices

PrivateIntbuffer triggerbuffer = intbuffer. Wrap (New Int[] {

0, One,0,

-One,-one,0,

One,-one,0,

});

2) use triggerbuffer to draw the vertex

Example: Gl. glvertexpointer (3, gl10.gl _ fixed, 0, triggerbuffer );

Must use a native order direct buffer error often occurs.

 

Solution: (create a method)

/*
* OpenGL is a very underlying drawing interface. Its buffer storage structure is consistent with our Java Program .
* Java uses bigedian, while OpenGL uses littleedian ).
* Therefore, we need to do some work when converting the Java buffer to the buffer zone available for OpenGL. The following describes how to create a buff:
**/
Public buffer bufferutil (INT [] ARR ){
Intbuffer mbuffer;
// Initialize the buffer first. The array length is * 4, because an int occupies 4 bytes.
Bytebuffer qbb = bytebuffer. allocatedirect (ARR. length * 4 );
// Nativeorder is used for Array Arrangement
Qbb. Order (byteorder. nativeorder ());

Mbuffer = qbb. asintbuffer ();
Mbuffer. Put (ARR );
Mbuffer. Position (0 );

Return mbuffer;
}

Next (also two steps ):

1) use an int array to create a vertex

PrivateInt [] triggerbuffer =New Int[] {

0, One,0,

-One,-one,0,

One,-one,0,

};

2) use Arrays

Gl. glvertexpointer (3, gl10.gl _ fixed, 0, bufferutil (triggerbuffer );