Generating a vertex buffer
You can generate a new vertex buffer with the following functions:
int GL.GenBufer(); void GL.GenBuffers(int n, out int buffers);
These functions work the same way that generating textures works. And just like with textures, a generated buffer is not active unless it is bound to be the active buffer.
You can use the following function to bind your generated buffer ID to an actual buffer:
void GL.BindBuffer(BufferTarget target, int buffer);
Just like with textures, if your buffer isn't bound, the function calls will not do what you think they will.
The second argument is a buffer id that was previously created. The first argument is what you want to use that buffer as. There are two values we care about:
- BufferTarget.ArrayBuffer is used when you want to specify vertex data such as position, normals, uv's etc...
- BufferTarget.ElementArrayBuffer is used if you are doing indexed rendering. This buffer will contain the indices for you to render.
When you are done drawing with a buffer, you should unbind that buffer. Just like with textures this is done by binding 0 to the active target. Like so:
GL.BindBuffer(BufferTarget.ArrayBuffer, 0); GL.BindBuffer(BufferTarget.ElementArrayBuffer, 0);