Function NewSprite

graphic/sprite.go:22–56

NewSprite creates and returns a pointer to a sprite with the specified dimensions and material

(width, height float32, imat material.IMaterial)

// NewSprite creates and returns a pointer to a sprite with the specified dimensions and material
func NewSprite(width, height float32, imat material.IMaterial) *Sprite {

	s := new(Sprite)

	// Creates geometry
	geom := geometry.NewGeometry()
	w := width / 2
	h := height / 2

	// Builds array with vertex positions and texture coordinates
	positions := math32.NewArrayF32(0, 12)
	positions.Append(
		-w, -h, 0, 0, 0,
		w, -h, 0, 1, 0,
		w, h, 0, 1, 1,
		-w, h, 0, 0, 1,
	)
	// Builds array of indices
	indices := math32.NewArrayU32(0, 6)
	indices.Append(0, 1, 2, 0, 2, 3)

	// Set geometry buffers
	geom.SetIndices(indices)
	geom.AddVBO(
		gls.NewVBO(positions).
			AddAttrib(gls.VertexPosition).
			AddAttrib(gls.VertexTexcoord),
	)

	s.Graphic.Init(s, geom, gls.TRIANGLES)
	s.AddMaterial(s, imat, 0, 0)

	s.uniMVPM.Init("MVP")
	return s
}

// RenderSetup sets up the rendering of the sprite.
func (s *Sprite) RenderSetup(gs *gls.GLS, rinfo *core.RenderInfo) {