void R3Rectangle::
Draw(const R3DrawFlags draw_flags) const
{
// Check if box is empty
if (IsEmpty()) return;
/* Get texture coordinates */
static R2Point texcoords[4] = {
R2Point(0.0, 0.0),
R2Point(1.0, 0.0),
R2Point(1.0, 1.0),
R2Point(0.0, 1.0)
};
/* Get box corner points */
R3Point corners[4];
corners[0] = Corner(RN_NN_QUADRANT);
corners[1] = Corner(RN_PN_QUADRANT);
corners[2] = Corner(RN_PP_QUADRANT);
corners[3] = Corner(RN_NP_QUADRANT);
// Draw surface
if (draw_flags[R3_SURFACES_DRAW_FLAG]) {
if (draw_flags[R3_SURFACE_NORMALS_DRAW_FLAG])
R3LoadNormal(Normal());
R3BeginPolygon();
for (int j = 0; j < 4; j++) {
if (draw_flags[R3_VERTEX_TEXTURE_COORDS_DRAW_FLAG])
R3LoadTextureCoords(texcoords[j]);
R3LoadPoint(corners[j]);
}
R3EndPolygon();
}
// Draw edges
if (draw_flags[R3_EDGES_DRAW_FLAG]) {
R3BeginLoop();
for (int i = 0; i < 4; i++)
R3LoadPoint(corners[i]);
R3EndLoop();
}
}
void R3Circle::
Draw(const R3DrawFlags draw_flags) const
{
// Push matrix (Zaxis -> ScaledNormal + OffsetToCenter)
R4Matrix matrix = R4identity_matrix;
matrix.Translate(center.Vector());
matrix.Rotate(R3posz_vector, Normal());
matrix.Push();
// Draw surface
if (draw_flags[R3_SURFACES_DRAW_FLAG]) {
// Load normal
if (draw_flags[R3_SURFACE_NORMALS_DRAW_FLAG])
R3LoadNormal(R3posz_vector);
// Draw circle in XY plane
R3BeginPolygon();
for (int i = 0; i < R3circle_npoints; i++) {
if (draw_flags[R3_VERTEX_TEXTURE_COORDS_DRAW_FLAG])
R3LoadTextureCoords(R3circle_texcoords[i]);
R3LoadPoint(R3circle_points[i] * radius);
}
R3EndPolygon();
}
// Draw edges
if (draw_flags[R3_EDGES_DRAW_FLAG]) {
R3BeginLoop();
for (int i = 0; i < R3circle_npoints; i++)
R3LoadPoint(R3circle_points[i] * radius);
R3EndLoop();
}
// Pop matrix
matrix.Pop();
}
void R3OrientedBox::
Draw(const R3DrawFlags draw_flags) const
{
// Check if box is empty
if (IsEmpty()) return;
static R2Point texcoords[4] = {
R2Point(0.0, 0.0),
R2Point(1.0, 0.0),
R2Point(1.0, 1.0),
R2Point(0.0, 1.0)
};
static int surface_paths[6][4] = {
{ 3, 0, 1, 2 },
{ 4, 7, 6, 5 },
{ 0, 4, 5, 1 },
{ 7, 3, 2, 6 },
{ 3, 7, 4, 0 },
{ 1, 5, 6, 2 }
};
static int outline_path[16] = {
0, 1, 2, 3,
0, 4, 5, 6,
7, 4, 5, 1,
2, 6, 7, 3
};
/* Get box corner points */
R3Point corners[8];
corners[0] = Corner(RN_NNN_OCTANT);
corners[1] = Corner(RN_NNP_OCTANT);
corners[2] = Corner(RN_NPP_OCTANT);
corners[3] = Corner(RN_NPN_OCTANT);
corners[4] = Corner(RN_PNN_OCTANT);
corners[5] = Corner(RN_PNP_OCTANT);
corners[6] = Corner(RN_PPP_OCTANT);
corners[7] = Corner(RN_PPN_OCTANT);
// Draw surface
if (draw_flags[R3_SURFACES_DRAW_FLAG]) {
for (int i = 0; i < 6; i++) {
R3BeginPolygon();
if (draw_flags[R3_SURFACE_NORMALS_DRAW_FLAG]) {
RNScalar sign = (i < 3) ? 1.0 : -1.0;
R3LoadNormal(sign * Axis(i%3));
}
for (int j = 0; j < 4; j++) {
if (draw_flags[R3_VERTEX_TEXTURE_COORDS_DRAW_FLAG])
R3LoadTextureCoords(texcoords[j]);
R3LoadPoint(corners[surface_paths[i][j]]);
}
R3EndPolygon();
}
}
// Draw edges
if (draw_flags[R3_EDGES_DRAW_FLAG]) {
R3BeginLine();
for (int i = 0; i < 16; i++)
R3LoadPoint(corners[outline_path[i]]);
R3EndLine();
}
}
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 | 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_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 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;
}
}
