This is the documentation for Enlighten.
struct Geo RastFragment
struct Geo::RastFragment
stores a fragment of a triangle i.e. a triangle clipped to a pixel box
Variables
Name | Description |
---|---|
Geo::u32 m_NumPts | number of points in fragment polygon |
const RastVert * m_Points | fragment polygon points; coordinates are in [0,1]x[0,1] i.e. |
const RastTri * m_Tri | reference to triangle that owns this fragment |
Geo::s32 m_X | integer coordinates of (top-left of) pixel |
Geo::s32 m_Y | integer coordinates of (top-left of) pixel |
Functions
Name | Description |
---|---|
GetArea() | get signed area of fragment polygon; it's flipped if area < 0 |
GetBarycentricCoords(float, float, float &, float &) | get barycentric coordinates of a point in the pixel |
GetCentroid(RastVert &) | get centroid of fragment polygon (average of vertex positions) |
IsPtInPoly(float, float) | is a given point in the fragment polygon? |
float Geo::RastFragment::GetArea
public: float GetArea() const
get signed area of fragment polygon; it's flipped if area < 0
void Geo::RastFragment::GetBarycentricCoords
public: void GetBarycentricCoords
(
  float x,
  float y,
  float & u,
  float & v
) const
get barycentric coordinates of a point in the pixel
void Geo::RastFragment::GetCentroid
public: void GetCentroid
(
  RastVert & out
) const
get centroid of fragment polygon (average of vertex positions)
bool Geo::RastFragment::IsPtInPoly
public: bool IsPtInPoly
(
  float x,
  float y
) const
is a given point in the fragment polygon?