func uploadGeometry(mesh *geometry) {
gl.GenVertexArrays(1, &mesh.glVao)
gl.BindVertexArray(mesh.glVao)
gl.GenBuffers(1, &mesh.glVertBuf)
gl.BindBuffer(gl.ARRAY_BUFFER, mesh.glVertBuf)
gl.EnableVertexAttribArray(progPosAttrLoc)
gl.VertexAttribPointer(progPosAttrLoc, 3, gl.FLOAT, gl.FALSE, 0, gl.Ptr(nil))
gl.BufferData(gl.ARRAY_BUFFER, gl.Sizeiptr(4*len(mesh.glVerts)), gl.Ptr(&mesh.glVerts[0]), gl.STATIC_DRAW)
gl.BindBuffer(gl.ARRAY_BUFFER, 0)
gl.BindVertexArray(0)
}
// Calls gl.BufferData() and yields the err returned by Util.LastError(), if any.
func (_ GlTry) BufferData(target gl.Enum, size gl.Sizeiptr, data gl.Ptr, usage gl.Enum) (err error) {
gl.BufferData(target, size, data, usage)
err = Util.LastError("gl.BufferData()")
return
}