//template<class Scanline, class Ras>
public void render_gouraud(IScanlineCache sl, IRasterizer <T> ras)
{
T alpha = m_alpha.value();
T brc = M.One <T>();
#if SourceDepth24
pixfmt_alpha_blend_rgb pf = new pixfmt_alpha_blend_rgb(rbuf_window(), new blender_bgr());
#else
FormatRGBA pf = new FormatRGBA(rbuf_window(), new BlenderBGRA());
#endif
FormatClippingProxy ren_base = new FormatClippingProxy(pf);
AGG.SpanAllocator span_alloc = new SpanAllocator();
SpanGouraudRgba <T> span_gen = new SpanGouraudRgba <T>();
ras.Gamma(new GammaLinear(0.0, m_gamma.value().ToDouble()));
T d = m_dilation.value();
// Six triangles
T xc = m_x[0].Add(m_x[1]).Add(m_x[2]).Divide(3.0);
T yc = m_y[0].Add(m_y[1]).Add(m_y[2]).Divide(3.0);
T x1 = m_x[1].Add(m_x[0]).Divide(2).Subtract(xc.Subtract(m_x[1].Add(m_x[0]).Divide(2)));
T y1 = m_y[1].Add(m_y[0]).Divide(2).Subtract(yc.Subtract(m_y[1].Add(m_y[0]).Divide(2)));
T x2 = m_x[2].Add(m_x[1]).Divide(2).Subtract(xc.Subtract(m_x[2].Add(m_x[1]).Divide(2)));
T y2 = m_y[2].Add(m_y[1]).Divide(2).Subtract(yc.Subtract(m_y[2].Add(m_y[1]).Divide(2)));
T x3 = m_x[0].Add(m_x[2]).Divide(2).Subtract(xc.Subtract(m_x[0].Add(m_x[2]).Divide(2)));
T y3 = m_y[0].Add(m_y[2]).Divide(2).Subtract(yc.Subtract(m_y[0].Add(m_y[2]).Divide(2)));
span_gen.Colors(new RGBA_Doubles(1, 0, 0, alpha.ToDouble()),
new RGBA_Doubles(0, 1, 0, alpha.ToDouble()),
new RGBA_Doubles(brc.ToDouble(), brc.ToDouble(), brc.ToDouble(), alpha.ToDouble()));
span_gen.Triangle(m_x[0], m_y[0], m_x[1], m_y[1], xc, yc, d);
ras.AddPath(span_gen);
Renderer <T> .GenerateAndRender(ras, sl, ren_base, span_alloc, span_gen);
span_gen.Colors(new RGBA_Doubles(0, 1, 0, alpha.ToDouble()),
new RGBA_Doubles(0, 0, 1, alpha.ToDouble()),
new RGBA_Doubles(brc.ToDouble(), brc.ToDouble(), brc.ToDouble(), alpha.ToDouble()));
span_gen.Triangle(m_x[1], m_y[1], m_x[2], m_y[2], xc, yc, d);
ras.AddPath(span_gen);
Renderer <T> .GenerateAndRender(ras, sl, ren_base, span_alloc, span_gen);
span_gen.Colors(new RGBA_Doubles(0, 0, 1, alpha.ToDouble()),
new RGBA_Doubles(1, 0, 0, alpha.ToDouble()),
new RGBA_Doubles(brc.ToDouble(), brc.ToDouble(), brc.ToDouble(), alpha.ToDouble()));
span_gen.Triangle(m_x[2], m_y[2], m_x[0], m_y[0], xc, yc, d);
ras.AddPath(span_gen);
Renderer <T> .GenerateAndRender(ras, sl, ren_base, span_alloc, span_gen);
brc = M.One <T>().Subtract(brc);
span_gen.Colors(new RGBA_Doubles(1, 0, 0, alpha.ToDouble()),
new RGBA_Doubles(0, 1, 0, alpha.ToDouble()),
new RGBA_Doubles(brc.ToDouble(), brc.ToDouble(), brc.ToDouble(), alpha.ToDouble()));
span_gen.Triangle(m_x[0], m_y[0], m_x[1], m_y[1], x1, y1, d);
ras.AddPath(span_gen);
Renderer <T> .GenerateAndRender(ras, sl, ren_base, span_alloc, span_gen);
span_gen.Colors(new RGBA_Doubles(0, 1, 0, alpha.ToDouble()),
new RGBA_Doubles(0, 0, 1, alpha.ToDouble()),
new RGBA_Doubles(brc.ToDouble(), brc.ToDouble(), brc.ToDouble(), alpha.ToDouble()));
span_gen.Triangle(m_x[1], m_y[1], m_x[2], m_y[2], x2, y2, d);
ras.AddPath(span_gen);
Renderer <T> .GenerateAndRender(ras, sl, ren_base, span_alloc, span_gen);
span_gen.Colors(new RGBA_Doubles(0, 0, 1, alpha.ToDouble()),
new RGBA_Doubles(1, 0, 0, alpha.ToDouble()),
new RGBA_Doubles(brc.ToDouble(), brc.ToDouble(), brc.ToDouble(), alpha.ToDouble()));
span_gen.Triangle(m_x[2], m_y[2], m_x[0], m_y[0], x3, y3, d);
ras.AddPath(span_gen);
Renderer <T> .GenerateAndRender(ras, sl, ren_base, span_alloc, span_gen);
}
