Method RenderSetup

light/spot.go:125–150

RenderSetup is called by the engine before rendering the scene

(gs *gls.GLS, rinfo *core.RenderInfo, idx int)

// RenderSetup is called by the engine before rendering the scene
func (l *Spot) RenderSetup(gs *gls.GLS, rinfo *core.RenderInfo, idx int) {

	// Calculates and updates light position uniform in camera coordinates
	var pos math32.Vector3
	l.WorldPosition(&pos)
	var pos4 math32.Vector4
	pos4.SetVector3(&pos, 1.0)
	pos4.ApplyMatrix4(&rinfo.ViewMatrix)
	l.udata.position.X = pos4.X
	l.udata.position.Y = pos4.Y
	l.udata.position.Z = pos4.Z

	// Calculates and updates light direction uniform in camera coordinates
	var dir math32.Vector3
	l.WorldDirection(&dir)
	pos4.SetVector3(&dir, 0.0)
	pos4.ApplyMatrix4(&rinfo.ViewMatrix)
	l.udata.direction.X = pos4.X
	l.udata.direction.Y = pos4.Y
	l.udata.direction.Z = pos4.Z

	// Transfer uniform data
	const vec3count = 5
	location := l.uni.LocationIdx(gs, vec3count*int32(idx))
	gs.Uniform3fv(location, vec3count, &l.udata.color.R)
}