Exemple #1
0
// toDraw sets the render data needed for a single draw call.
// The data is copied into a render.Draw instance. One of the key jobs
// of this method is to put each draw request into a particular
// render bucket so that they are drawn in order once sorted.
func (sm *scene) toDraw(d render.Draw, p *pov, cam *camera, m *model, rt uint32) {
	d.SetMv(sm.mv.Mult(p.mm, cam.vm))    // model-view
	d.SetMvp(sm.mvp.Mult(sm.mv, cam.pm)) // model-view-projection
	d.SetPm(cam.pm)                      // projection only.
	d.SetScale(p.Scale())
	d.SetTag(p.eid)

	// Set the drawing order hints. Overlay trumps transparency since 2D overlay
	// objects can't be sorted by distance anyways.
	bucket := render.OPAQUE // used to sort the draw data. Lowest first.
	switch {
	case m.castShadow && rt > 0:
		bucket = render.DEPTH_PASS // pre-passes first.
	case cam.overlay > 0:
		bucket = cam.overlay // OVERLAY draw last.
	case m.alpha < 1:
		bucket = render.TRANSPARENT // sort and draw after opaque.
	}
	depth := cam.depth && m.depth // both must be true for depth rendering.
	tocam := 0.0
	if depth {
		tocam = p.toc
	}
	d.SetHints(bucket, tocam, depth, rt)

	// use the shadow map texture for models that show shadows.
	if m.hasShadows {
		m.UseLayer(sm.shadowMap)
	}
}
Exemple #2
0
// toDraw sets all the data references and uniform data needed
// by the rendering layer.
func (m *model) toDraw(d render.Draw, eid uint64, depth bool, overlay int, distToCam float64) {
	d.SetTag(eid)
	d.SetAlpha(float64(m.alpha)) // 1 : no transparency as the default.

	// Set the drawing hints. Overlay trumps transparency since 2D overlay
	// objects can't be sorted by distance anyways.
	bucket := OPAQUE // used to sort the draw data. Lowest first.
	switch {
	case overlay > 0:
		bucket = overlay // OVERLAY draw last.
	case m.alpha < 1:
		bucket = TRANSPARENT // sort and draw after opaque.
	}
	depth = depth && m.depth // both must be true for depth rendering.
	tocam := 0.0
	if depth {
		tocam = distToCam
	}
	d.SetHints(bucket, tocam, depth)

	// Set the drawing references.
	d.SetRefs(m.shd.program, m.msh.vao, m.drawMode)
	if total := len(m.texs); total > 0 {
		for cnt, t := range m.texs {
			d.SetTex(total, cnt, t.tid, t.f0, t.fn)
		}
	} else {
		d.SetTex(0, 0, 0, 0, 0) // clear any previous data.
	}

	// Set uniform values. These can be sent as a reference because they
	// are fixed on shader creation.
	d.SetUniforms(m.shd.uniforms) // shader integer uniform references.
	if m.anm != nil && len(m.pose) > 0 {
		d.SetPose(m.pose)
	} else {
		d.SetPose(nil) // clear data.
	}
	d.SetTime(time.Since(m.time).Seconds()) // For shaders that need elapsed time.

	// Set colour uniforms.
	d.SetFloats("kd", m.kd.R, m.kd.G, m.kd.B)
	d.SetFloats("ks", m.ks.R, m.ks.G, m.ks.B)
	d.SetFloats("ka", m.ka.R, m.ka.G, m.ka.B)

	// Set user specificed uniforms.
	for uniform, uvalues := range m.uniforms {
		d.SetFloats(uniform, uvalues...)
	}
}