// toDraw sets the model specific bound data references and
// uniform data needed by the rendering layer.
func (m *model) toDraw(d render.Draw, mm *lin.M4) {
d.SetAlpha(float64(m.alpha)) // 1 : no transparency as the default.
// Use any previous render to texture passes.
if m.layer != nil {
switch m.layer.attr {
case render.IMAGE_BUFF:
// handled as regular texture below.
// Leave it to the shader to use the right the "uv#" uniform.
case render.DEPTH_BUFF:
d.SetShadowmap(m.layer.tex.tid) // texture with depth values.
// Shadow depth bias is the mvp matrix from the light.
// It needs to be adjusted to allow shadow maps to work.
m.sm.Mult(mm, m.layer.vp) // model (light) view.
m.sm.Mult(m.sm, m.layer.bm) // incorporate shadow bias.
d.SetDbm(m.sm)
}
}
// Set the bound data 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...)
}
}
