Method RenderSetup

geometry/geometry.go:516–540

RenderSetup is called by the renderer before drawing the geometry.

(gs *gls.GLS)

// RenderSetup is called by the renderer before drawing the geometry.
func (g *Geometry) RenderSetup(gs *gls.GLS) {

	// First time initialization
	if g.gs == nil {
		// Generate VAO
		g.handleVAO = gs.GenVertexArray()
		// Generate buffer for indices
		g.handleIndices = gs.GenBuffer()
		// Save pointer to gs indicating initialization was done
		g.gs = gs
	}

	// Update VBOs
	gs.BindVertexArray(g.handleVAO)
	for _, vbo := range g.vbos {
		vbo.Transfer(gs)
	}

	// Update Indices buffer if necessary
	if g.indices.Size() > 0 && g.updateIndices {
		gs.BindBuffer(gls.ELEMENT_ARRAY_BUFFER, g.handleIndices)
		gs.BufferData(gls.ELEMENT_ARRAY_BUFFER, g.indices.Bytes(), g.indices.ToUint32(), gls.STATIC_DRAW)
		g.updateIndices = false
	}
}