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line_strip.go
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/
line_strip.go
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// Copyright 2016 The G3N Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package graphic
import (
"github.com/g3n/engine/core"
"github.com/g3n/engine/geometry"
"github.com/g3n/engine/gls"
"github.com/g3n/engine/material"
)
// LineStrip is a Graphic which is rendered as a collection of connected lines.
type LineStrip struct {
Graphic // Embedded graphic object
uniMVPm gls.Uniform // Model view projection matrix uniform location cache
}
// NewLineStrip creates and returns a pointer to a new LineStrip graphic
// with the specified geometry and material.
func NewLineStrip(igeom geometry.IGeometry, imat material.IMaterial) *LineStrip {
l := new(LineStrip)
l.Graphic.Init(igeom, gls.LINE_STRIP)
l.AddMaterial(l, imat, 0, 0)
l.uniMVPm.Init("MVP")
return l
}
// RenderSetup is called by the engine before drawing this geometry.
func (l *LineStrip) RenderSetup(gs *gls.GLS, rinfo *core.RenderInfo) {
// Transfer model view projection matrix uniform
mvpm := l.ModelViewProjectionMatrix()
location := l.uniMVPm.Location(gs)
gs.UniformMatrix4fv(location, 1, false, &mvpm[0])
}
// Raycast satisfies the INode interface and checks the intersections
// of this geometry with the specified raycaster.
func (l *LineStrip) Raycast(rc *core.Raycaster, intersects *[]core.Intersect) {
lineRaycast(l, rc, intersects, 1)
}