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  Vertex Array Sample??  (Read 2491 times)
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Offline 2late4u

Senior Newbie




.....


« Posted 2004-03-23 06:06:28 »

Hi to all ...
have someone some example of usign java.nio.buffer for this opengl calls?

gl.glVertexPointer(int p1, gl.GL_FLOAT, 0, Buffer);
gl.glTexCoordPointer(2, gl.GL_FLOAT, 0, Buffer);

how do i can fills the buffers?
and ... when i must do it?
Offline overnhet

Junior Devvie




Java games rock!


« Reply #1 - Posted 2004-03-23 06:51:15 »

1) allocate a direct, native ordered {Byte, Float, Int}Buffer per data set using net.java.games.jogl.util.BufferUtils

2) fill each buffer with data (using put(int[]) for example)

3) enable GL states with glEnableClientState(GL_VERTEX_ARRAY) and glEnableClientState(GL_TEXTURE_COORD_ARRAY)

4) bind buffers :
glVertexPointer(3, GL_INT, 0, vertices);
glColorPointer(3, GL_FLOAT, 0, colors);

5) draw with glDrawArrays (draw everything) or glDrawElements (draw only a subset)


Some comments :

* even though you can use a single buffer to store all your vertex, texture coord, color and normal data, it is IMO easier to keep them in separate buffers

* usually you'll only need to enable vertex array states once, in the init method

* when you bind a buffer, data can be copied but it is not a requirement ; therefore when you modify your buffer you must rebind it
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