static void
DrawLights(R3Scene *scene)
{
// Draw all lights
double radius = scene->BBox().DiagonalRadius();
for (int i = 0; i < scene->NLights(); i++) {
R3Light *light = scene->Light(i);
RNLoadRgb(light->Color());
if (light->ClassID() == R3DirectionalLight::CLASS_ID()) {
R3DirectionalLight *directional_light = (R3DirectionalLight *) light;
R3Vector direction = directional_light->Direction();
// Draw direction vector
glBegin(GL_LINES);
R3Point centroid = scene->BBox().Centroid();
R3LoadPoint(centroid - radius * direction);
R3LoadPoint(centroid - 1.25 * radius * direction);
glEnd();
}
else if (light->ClassID() == R3PointLight::CLASS_ID()) {
// Draw sphere at point light position
R3PointLight *point_light = (R3PointLight *) light;
R3Point position = point_light->Position();
// Draw sphere at light position
R3Sphere(position, 0.1 * radius).Draw();
}
else if (light->ClassID() == R3SpotLight::CLASS_ID()) {
R3SpotLight *spot_light = (R3SpotLight *) light;
R3Point position = spot_light->Position();
R3Vector direction = spot_light->Direction();
// Draw sphere at light position
R3Sphere(position, 0.1 * radius).Draw();
// Draw direction vector
glBegin(GL_LINES);
R3LoadPoint(position);
R3LoadPoint(position + 0.25 * radius * direction);
glEnd();
}
else {
fprintf(stderr, "Unrecognized light type: %d\n", light->ClassID());
return;
}
}
}
void R3Triangle::
Draw(const R3DrawFlags draw_flags) const
{
// Ammend draw flags
R3DrawFlags flags(Flags() & draw_flags);
RNDimension dim = 0, dim1 = 0, dim2 = 0;
// Unroll flags/loops for efficiency
switch (flags) {
case R3_SURFACES_DRAW_FLAG:
// No shading
R3BeginPolygon();
R3LoadPoint(v[0]->Position());
R3LoadPoint(v[1]->Position());
R3LoadPoint(v[2]->Position());
R3EndPolygon();
break;
case R3_SURFACES_DRAW_FLAG | R3_SURFACE_NORMALS_DRAW_FLAG:
// Flat shading
R3BeginPolygon();
R3LoadNormal(Normal());
R3LoadPoint(v[0]->Position());
R3LoadPoint(v[1]->Position());
R3LoadPoint(v[2]->Position());
R3EndPolygon();
break;
case R3_SURFACES_DRAW_FLAG | R3_VERTEX_COLORS_DRAW_FLAG:
// Color interpolation
R3BeginPolygon();
RNLoadRgb(v[0]->Color());
R3LoadPoint(v[0]->Position());
RNLoadRgb(v[1]->Color());
R3LoadPoint(v[1]->Position());
RNLoadRgb(v[2]->Color());
R3LoadPoint(v[2]->Position());
R3EndPolygon();
break;
case R3_SURFACES_DRAW_FLAG | R3_SURFACE_NORMALS_DRAW_FLAG | R3_VERTEX_NORMALS_DRAW_FLAG:
// Gouraud shading
R3BeginPolygon();
R3LoadNormal(v[0]->Normal());
R3LoadPoint(v[0]->Position());
R3LoadNormal(v[1]->Normal());
R3LoadPoint(v[1]->Position());
R3LoadNormal(v[2]->Normal());
R3LoadPoint(v[2]->Position());
R3EndPolygon();
break;
case R3_SURFACES_DRAW_FLAG | R3_SURFACE_NORMALS_DRAW_FLAG |
R3_SURFACE_TEXTURE_DRAW_FLAG | R3_VERTEX_TEXTURE_COORDS_DRAW_FLAG:
// Flat shading with texture coordinates
R3BeginPolygon();
R3LoadNormal(Normal());
R3LoadTextureCoords(v[0]->TextureCoords());
R3LoadPoint(v[0]->Position());
R3LoadTextureCoords(v[1]->TextureCoords());
R3LoadPoint(v[1]->Position());
R3LoadTextureCoords(v[2]->TextureCoords());
R3LoadPoint(v[2]->Position());
R3EndPolygon();
break;
case R3_SURFACES_DRAW_FLAG | R3_SURFACE_NORMALS_DRAW_FLAG |
R3_SURFACE_TEXTURE_DRAW_FLAG:
// Flat shading with texture coordinate generation
dim = Normal().MaxDimension();
dim1 = (dim + 1) % 3;
dim2 = (dim + 2) % 3;
R3BeginPolygon();
R3LoadNormal(Normal());
R3LoadTextureCoords(v[0]->Position()[dim1], v[0]->Position()[dim2]);
R3LoadPoint(v[0]->Position());
R3LoadTextureCoords(v[1]->Position()[dim1], v[1]->Position()[dim2]);
R3LoadPoint(v[1]->Position());
R3LoadTextureCoords(v[2]->Position()[dim1], v[2]->Position()[dim2]);
R3LoadPoint(v[2]->Position());
R3EndPolygon();
break;
case R3_SURFACES_DRAW_FLAG | R3_SURFACE_NORMALS_DRAW_FLAG | R3_VERTEX_NORMALS_DRAW_FLAG |
R3_SURFACE_TEXTURE_DRAW_FLAG | R3_VERTEX_TEXTURE_COORDS_DRAW_FLAG:
// Gouraud shading with texture coordinates
R3BeginPolygon();
R3LoadTextureCoords(v[0]->TextureCoords());
R3LoadNormal(v[0]->Normal());
R3LoadPoint(v[0]->Position());
R3LoadTextureCoords(v[1]->TextureCoords());
R3LoadNormal(v[1]->Normal());
R3LoadPoint(v[1]->Position());
R3LoadTextureCoords(v[2]->TextureCoords());
R3LoadNormal(v[2]->Normal());
R3LoadPoint(v[2]->Position());
R3EndPolygon();
break;
case R3_SURFACES_DRAW_FLAG | R3_SURFACE_NORMALS_DRAW_FLAG | R3_VERTEX_NORMALS_DRAW_FLAG |
R3_SURFACE_TEXTURE_DRAW_FLAG:
// Gouraud shading with texture coordinate generation
dim = Normal().MaxDimension();
dim1 = (dim + 1) % 3;
dim2 = (dim + 2) % 3;
R3BeginPolygon();
R3LoadTextureCoords(v[0]->Position()[dim1], v[0]->Position()[dim2]);
R3LoadNormal(v[0]->Normal());
R3LoadPoint(v[0]->Position());
R3LoadTextureCoords(v[1]->Position()[dim1], v[1]->Position()[dim2]);
R3LoadNormal(v[1]->Normal());
R3LoadPoint(v[1]->Position());
R3LoadTextureCoords(v[2]->Position()[dim1], v[2]->Position()[dim2]);
R3LoadNormal(v[2]->Normal());
R3LoadPoint(v[2]->Position());
R3EndPolygon();
break;
default:
// Draw surface
if (flags[R3_SURFACES_DRAW_FLAG]) {
// Begin polygon
R3BeginPolygon();
// Load polygon normal
if ((flags[R3_SURFACE_NORMALS_DRAW_FLAG]) &&
(!flags[R3_VERTEX_NORMALS_DRAW_FLAG]))
R3LoadNormal(Normal());
// Compute stuff for texture coordinates
if ((draw_flags[R3_VERTEX_TEXTURE_COORDS_DRAW_FLAG]) &&
(!flags[R3_VERTEX_TEXTURE_COORDS_DRAW_FLAG])) {
dim = Normal().MaxDimension();
dim1 = (dim + 1) % 3;
dim2 = (dim + 2) % 3;
}
// Load triangle vertices
for (int i = 0; i < 3; i++) {
// Load vertex color
if (flags[R3_VERTEX_COLORS_DRAW_FLAG]) {
RNLoadRgb(v[i]->Color());
}
// Load vertex normal
if (flags[R3_VERTEX_NORMALS_DRAW_FLAG])
R3LoadNormal(v[i]->normal);
// Load vertex texture coordinates
if (draw_flags[R3_VERTEX_TEXTURE_COORDS_DRAW_FLAG]) {
if (flags[R3_VERTEX_TEXTURE_COORDS_DRAW_FLAG]) R3LoadTextureCoords(v[i]->TextureCoords());
else R3LoadTextureCoords(v[i]->Position()[dim1], v[i]->Position()[dim2]);
}
// Load vertex
R3LoadPoint(v[i]->Position());
}
// End polygon
R3EndPolygon();
}
// Draw edges
if (flags[R3_EDGES_DRAW_FLAG]) {
R3BeginLoop();
R3LoadPoint(v[0]->Position());
R3LoadPoint(v[1]->Position());
R3LoadPoint(v[2]->Position());
R3EndLoop();
}
break;
}
}
