void Mesh_handle::DrawTri(){
     glBindBuffer(GL_ARRAY_BUFFER,vertexbufferid);
    glBindBuffer(GL_ELEMENT_ARRAY_BUFFER,elementbufferid);
    int index1=glGetAttribLocation(bound_program,"inputvertex");
    int index2=glGetAttribLocation(bound_program,"inputcolor");
    int index3=glGetAttribLocation(bound_program,"inputtexcoord");

    glEnableVertexAttribArray(index1);
    glVertexAttribPointer(index1,3,GL_FLOAT,GL_FALSE,9*sizeof(float),0);

    glEnableVertexAttribArray(index2);
    glVertexAttribPointer(index2,4,GL_FLOAT,GL_FALSE,9*sizeof(float),(void*)(3*sizeof(float)));

    glEnableVertexAttribArray(index3);
    glVertexAttribPointer(index3,2,GL_FLOAT,GL_FALSE,9*sizeof(float),(void*)(7*sizeof(float)));

    glDrawArrays(GL_TRIANGLE_STRIP,0,elementcount);
    //glDrawElements(GL_TRIANGLE_STRIP,elementcount,GL_UNSIGNED_INT,0);
}