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#pragma once
#include <cstddef>
#include "math/Vector3.h"
#include "math/Vector4.h"
#include "Vertex3f.h"
#include "TexCoord2f.h"
#include "VertexTraits.h"
/**
* Data structure representing a mesh vertex.
*/
class MeshVertex
{
public:
TexCoord2f texcoord;
Normal3 normal;
Vertex3 vertex;
Normal3 tangent;
Normal3 bitangent;
// Vertex colour
Vector4 colour;
/// Default constructor.
MeshVertex()
: tangent(0, 0, 0),
bitangent(0, 0, 0),
colour(1.0, 1.0, 1.0, 1.0)
{}
/// Initialising constructor, leaves colour at 1,1,1,1 and tangent vectors at 0,0,0
MeshVertex(const Vertex3& v, const Normal3& n, const TexCoord2f& t) :
MeshVertex(v, n, t, { 1.0, 1.0, 1.0, 1.0 })
{}
/// Initialising constructor, leaves tangent vectors at 0,0,0
MeshVertex(const Vertex3& v, const Normal3& n, const TexCoord2f& t, const Vector4& c) :
MeshVertex(v, n, t, c, { 0, 0, 0 }, { 0, 0, 0 })
{}
// Initialises all attributes of this vertex
MeshVertex(const Vertex3& vertex_, const Normal3& normal_,
const TexCoord2f& texcoord_, const Vector4& colour_,
const Normal3& tangent_, const Normal3& bitangent_) :
texcoord(texcoord_),
normal(normal_),
vertex(vertex_),
tangent(tangent_),
bitangent(bitangent_),
colour(colour_)
{}
/// Cast to simple Vertex3, throwing away other components
operator Vertex3() const
{
return vertex;
}
};
/// Less-than comparison for MeshVertex
inline bool operator<(const MeshVertex& first,
const MeshVertex& other)
{
if (first.texcoord != other.texcoord)
{
return first.texcoord < other.texcoord;
}
if (first.normal != other.normal)
{
return first.normal < other.normal;
}
if (first.vertex != other.vertex)
{
return first.vertex < other.vertex;
}
return false;
}
/// Equality comparison for MeshVertex
inline bool operator==(const MeshVertex& first,
const MeshVertex& other)
{
return first.texcoord == other.texcoord
&& first.normal == other.normal
&& first.vertex == other.vertex;
}
/// Inequality comparison for MeshVertex
inline bool operator!=(const MeshVertex& first,
const MeshVertex& other)
{
return !(first == other);
}
namespace render
{
/// VertexTraits specialisation for MeshVertex
template<> class VertexTraits<MeshVertex>
{
public:
static const void* VERTEX_OFFSET()
{
return reinterpret_cast<const void*>(
offsetof(MeshVertex, vertex)
);
}
static bool hasNormal() { return true; }
static const void* NORMAL_OFFSET()
{
return reinterpret_cast<const void*>(
offsetof(MeshVertex, normal)
);
}
static bool hasTexCoord() { return true; }
static const void* TEXCOORD_OFFSET()
{
return reinterpret_cast<const void*>(
offsetof(MeshVertex, texcoord)
);
}
static bool hasTangents() { return true; }
static const void* TANGENT_OFFSET()
{
return reinterpret_cast<const void*>(
offsetof(MeshVertex, tangent)
);
}
static const void* BITANGENT_OFFSET()
{
return reinterpret_cast<const void*>(
offsetof(MeshVertex, bitangent)
);
}
};
}
/**
* String output for MeshVertex.
*/
inline std::ostream& operator<< (std::ostream& os, const MeshVertex& v)
{
os << "MeshVertex { "
<< " vertex = " << v.vertex << ", normal = " << v.normal
<< ", texcoord = " << v.texcoord << ", colour = " << v.colour
<< " }";
return os;
}
/// \brief Calculates the tangent vectors for a triangle \p a, \p b, \p c and stores the tangent in \p s and the bitangent in \p t.
inline void MeshTriangle_calcTangents(const MeshVertex& a,
const MeshVertex& b, const MeshVertex& c,
Vector3& s, Vector3& t)
{
s = Vector3(0, 0, 0);
t = Vector3(0, 0, 0);
Vector3 aVec, bVec, cVec;
{
aVec.set(a.vertex.x(), a.texcoord.s(), a.texcoord.t());
bVec.set(b.vertex.x(), b.texcoord.s(), b.texcoord.t());
cVec.set(c.vertex.x(), c.texcoord.s(), c.texcoord.t());
Vector3 cross( (bVec-aVec).cross(cVec-aVec) );
if(fabs(cross.x()) > 0.000001f) {
s.x() = -cross.y() / cross.x();
}
if(fabs(cross.x()) > 0.000001f) {
t.x() = -cross.z() / cross.x();
}
}
{
aVec.set(a.vertex.y(), a.texcoord.s(), a.texcoord.t());
bVec.set(b.vertex.y(), b.texcoord.s(), b.texcoord.t());
cVec.set(c.vertex.y(), c.texcoord.s(), c.texcoord.t());
Vector3 cross( (bVec-aVec).cross(cVec-aVec));
if(fabs(cross.x()) > 0.000001f) {
s.y() = -cross.y() / cross.x();
}
if(fabs(cross.x()) > 0.000001f) {
t.y() = -cross.z() / cross.x();
}
}
{
aVec.set(a.vertex.z(), a.texcoord.s(), a.texcoord.t());
bVec.set(b.vertex.z(), b.texcoord.s(), b.texcoord.t());
cVec.set(c.vertex.z(), c.texcoord.s(), c.texcoord.t());
Vector3 cross( (bVec-aVec).cross(cVec-aVec));
if(fabs(cross.x()) > 0.000001f) {
s.z() = -cross.y() / cross.x();
}
if(fabs(cross.x()) > 0.000001f) {
t.z() = -cross.z() / cross.x();
}
}
}
inline void MeshTriangle_sumTangents(MeshVertex& a, MeshVertex& b, MeshVertex& c)
{
Vector3 s, t;
MeshTriangle_calcTangents(a, b, c, s, t);
a.tangent += s;
b.tangent += s;
c.tangent += s;
a.bitangent += t;
b.bitangent += t;
c.bitangent += t;
}
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