func (r *Renderer) Render() {
gl.EnableClientState(gl.VERTEX_ARRAY)
rVbo := r.Vbos[0]
gl.BindBuffer(gl.ARRAY_BUFFER, rVbo.Id)
for _, c := range r.Layer.Flatten() {
renderable := c.GetRenderable()
transform := c.GetTransform()
if renderable == nil || transform == nil || !c.Visible() {
continue
}
if rVbo != renderable.VboPosition.Vbo {
rVbo = renderable.VboPosition.Vbo
gl.BindBuffer(gl.ARRAY_BUFFER, rVbo.Id)
}
gl.VertexPointer(ValsInVertex, gl.FLOAT, 0, nil)
if transform.NeedsUpdate {
transform.Update()
}
gl.LoadMatrixf(&(transform.Matrix[0]))
gl.DrawArrays(gl.QUADS, int32(renderable.VboPosition.Index/ValsInVertex),
int32(renderable.Length/ValsInVertex))
}
gl.DisableClientState(gl.VERTEX_ARRAY)
}
func (t *Transform) update() {
gl.LoadMatrixf(&(t.parent.matrix[0]))
gl.Translatef(t.position.X, t.position.Y, 0)
gl.Rotatef(t.rotation, 0, 0, -1)
gl.GetFloatv(gl.MODELVIEW_MATRIX, &(t.parent.matrix[0]))
for _, c := range t.children {
c.update()
}
}
func (t *Transform) Update() {
var m *float32
if t.parentTransform != nil {
m = &(t.parentTransform.Matrix[0])
} else {
m = &(t.Matrix[0])
}
gl.LoadMatrixf(m)
gl.Translatef(t.position.X, t.position.Y, 0)
gl.Rotatef(t.rotation, 0, 0, -1)
gl.GetFloatv(gl.MODELVIEW_MATRIX, &(t.Matrix[0]))
t.NeedsUpdate = false
for _, c := range t.childTransforms {
c.Update()
}
}