void render_gouraud(Scanline& sl, Ras& ras)
{
unsigned alpha = int(m_alpha.value() * 255.0);
unsigned brc = 255;
typedef agg::renderer_base<pixfmt> base_ren_type;
#ifdef AGG_GRAY8
typedef agg::span_gouraud_gray8<> gouraud_span_gen_type;
#else
typedef agg::span_gouraud_rgba8<> gouraud_span_gen_type;
#endif
typedef agg::span_allocator<gouraud_span_gen_type::color_type> gouraud_span_alloc_type;
typedef agg::renderer_scanline_u<base_ren_type, gouraud_span_gen_type> renderer_gouraud;
pixfmt pf(rbuf_window());
base_ren_type ren_base(pf);
gouraud_span_alloc_type span_alloc;
gouraud_span_gen_type span_gen(span_alloc);
renderer_gouraud ren_gouraud(ren_base, span_gen);
ras.gamma(agg::gamma_linear(0.0, m_gamma.value()));
double d = m_dilation.value();
// Single triangle
//span_gen.colors(agg::rgba8(255, 0, 0, alpha),
// agg::rgba8(0, 255, 0, alpha),
// agg::rgba8(0, 0, 255, alpha));
//span_gen.triangle(m_x[0], m_y[0], m_x[1], m_y[1], m_x[2], m_y[2], d);
//ras.add_path(span_gen);
//ras.render(sl, ren_gouraud);
// Six triangles
double xc = (m_x[0] + m_x[1] + m_x[2]) / 3.0;
double yc = (m_y[0] + m_y[1] + m_y[2]) / 3.0;
double x1 = (m_x[1] + m_x[0]) / 2 - (xc - (m_x[1] + m_x[0]) / 2);
double y1 = (m_y[1] + m_y[0]) / 2 - (yc - (m_y[1] + m_y[0]) / 2);
double x2 = (m_x[2] + m_x[1]) / 2 - (xc - (m_x[2] + m_x[1]) / 2);
double y2 = (m_y[2] + m_y[1]) / 2 - (yc - (m_y[2] + m_y[1]) / 2);
double x3 = (m_x[0] + m_x[2]) / 2 - (xc - (m_x[0] + m_x[2]) / 2);
double y3 = (m_y[0] + m_y[2]) / 2 - (yc - (m_y[0] + m_y[2]) / 2);
span_gen.colors(agg::rgba8(255, 0, 0, alpha),
agg::rgba8(0, 255, 0, alpha),
agg::rgba8(brc, brc, brc, alpha));
span_gen.triangle(m_x[0], m_y[0], m_x[1], m_y[1], xc, yc, d);
ras.add_path(span_gen);
ras.render(sl, ren_gouraud);
span_gen.colors(agg::rgba8(0, 255, 0, alpha),
agg::rgba8(0, 0, 255, alpha),
agg::rgba8(brc, brc, brc, alpha));
span_gen.triangle(m_x[1], m_y[1], m_x[2], m_y[2], xc, yc, d);
ras.add_path(span_gen);
ras.render(sl, ren_gouraud);
span_gen.colors(agg::rgba8(0, 0, 255, alpha),
agg::rgba8(255, 0, 0, alpha),
agg::rgba8(brc, brc, brc, alpha));
span_gen.triangle(m_x[2], m_y[2], m_x[0], m_y[0], xc, yc, d);
ras.add_path(span_gen);
ras.render(sl, ren_gouraud);
brc = 255-brc;
span_gen.colors(agg::rgba8(255, 0, 0, alpha),
agg::rgba8(0, 255, 0, alpha),
agg::rgba8(brc, brc, brc, alpha));
span_gen.triangle(m_x[0], m_y[0], m_x[1], m_y[1], x1, y1, d);
ras.add_path(span_gen);
ras.render(sl, ren_gouraud);
span_gen.colors(agg::rgba8(0, 255, 0, alpha),
agg::rgba8(0, 0, 255, alpha),
agg::rgba8(brc, brc, brc, alpha));
span_gen.triangle(m_x[1], m_y[1], m_x[2], m_y[2], x2, y2, d);
ras.add_path(span_gen);
ras.render(sl, ren_gouraud);
span_gen.colors(agg::rgba8(0, 0, 255, alpha),
agg::rgba8(255, 0, 0, alpha),
agg::rgba8(brc, brc, brc, alpha));
span_gen.triangle(m_x[2], m_y[2], m_x[0], m_y[0], x3, y3, d);
ras.add_path(span_gen);
ras.render(sl, ren_gouraud);
}
void render_gouraud(Scanline& sl, Ras& ras)
{
double alpha = m_alpha.value();
double brc = 1;
typedef agg::renderer_base<pixfmt> base_ren_type;
#ifdef AGG_GRAY8
typedef agg::span_gouraud_gray<color_type> span_gen_type;
#else
typedef agg::span_gouraud_rgba<color_type> span_gen_type;
#endif
typedef agg::span_allocator<color_type> span_alloc_type;
pixfmt pf(rbuf_window());
base_ren_type ren_base(pf);
span_alloc_type span_alloc;
span_gen_type span_gen;
ras.gamma(agg::gamma_linear(0.0, m_gamma.value()));
double d = m_dilation.value();
// Single triangle
//span_gen.colors(agg::rgba(1, 0, 0, alpha),
// agg::rgba(0, 1, 0, alpha),
// agg::rgba(0, 0, 1, alpha));
//span_gen.triangle(m_x[0], m_y[0], m_x[1], m_y[1], m_x[2], m_y[2], d);
//ras.add_path(span_gen);
//agg::render_scanlines_aa(ras, sl, ren_base, span_alloc, span_gen);
// Six triangles
double xc = (m_x[0] + m_x[1] + m_x[2]) / 3.0;
double yc = (m_y[0] + m_y[1] + m_y[2]) / 3.0;
double x1 = (m_x[1] + m_x[0]) / 2 - (xc - (m_x[1] + m_x[0]) / 2);
double y1 = (m_y[1] + m_y[0]) / 2 - (yc - (m_y[1] + m_y[0]) / 2);
double x2 = (m_x[2] + m_x[1]) / 2 - (xc - (m_x[2] + m_x[1]) / 2);
double y2 = (m_y[2] + m_y[1]) / 2 - (yc - (m_y[2] + m_y[1]) / 2);
double x3 = (m_x[0] + m_x[2]) / 2 - (xc - (m_x[0] + m_x[2]) / 2);
double y3 = (m_y[0] + m_y[2]) / 2 - (yc - (m_y[0] + m_y[2]) / 2);
span_gen.colors(agg::rgba(1, 0, 0, alpha),
agg::rgba(0, 1, 0, alpha),
agg::rgba(brc, brc, brc, alpha));
span_gen.triangle(m_x[0], m_y[0], m_x[1], m_y[1], xc, yc, d);
ras.add_path(span_gen);
agg::render_scanlines_aa(ras, sl, ren_base, span_alloc, span_gen);
span_gen.colors(agg::rgba(0, 1, 0, alpha),
agg::rgba(0, 0, 1, alpha),
agg::rgba(brc, brc, brc, alpha));
span_gen.triangle(m_x[1], m_y[1], m_x[2], m_y[2], xc, yc, d);
ras.add_path(span_gen);
agg::render_scanlines_aa(ras, sl, ren_base, span_alloc, span_gen);
span_gen.colors(agg::rgba(0, 0, 1, alpha),
agg::rgba(1, 0, 0, alpha),
agg::rgba(brc, brc, brc, alpha));
span_gen.triangle(m_x[2], m_y[2], m_x[0], m_y[0], xc, yc, d);
ras.add_path(span_gen);
agg::render_scanlines_aa(ras, sl, ren_base, span_alloc, span_gen);
brc = 1-brc;
span_gen.colors(agg::rgba(1, 0, 0, alpha),
agg::rgba(0, 1, 0, alpha),
agg::rgba(brc, brc, brc, alpha));
span_gen.triangle(m_x[0], m_y[0], m_x[1], m_y[1], x1, y1, d);
ras.add_path(span_gen);
agg::render_scanlines_aa(ras, sl, ren_base, span_alloc, span_gen);
span_gen.colors(agg::rgba(0, 1, 0, alpha),
agg::rgba(0, 0, 1, alpha),
agg::rgba(brc, brc, brc, alpha));
span_gen.triangle(m_x[1], m_y[1], m_x[2], m_y[2], x2, y2, d);
ras.add_path(span_gen);
agg::render_scanlines_aa(ras, sl, ren_base, span_alloc, span_gen);
span_gen.colors(agg::rgba(0, 0, 1, alpha),
agg::rgba(1, 0, 0, alpha),
agg::rgba(brc, brc, brc, alpha));
span_gen.triangle(m_x[2], m_y[2], m_x[0], m_y[0], x3, y3, d);
ras.add_path(span_gen);
agg::render_scanlines_aa(ras, sl, ren_base, span_alloc, span_gen);
}