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? |
| Anchor | ||||
|---|---|---|---|---|
|
float Geo::RastFragment::GetArea
...
public: float GetArea() const
...
get signed area of fragment polygon; it's flipped if area < 0
| Anchor | ||||
|---|---|---|---|---|
|
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
| Anchor | ||||
|---|---|---|---|---|
|
void Geo::RastFragment::GetCentroid
...
public: void GetCentroid
(
RastVert & out
) const
...
get centroid of fragment polygon (average of vertex positions)
| Anchor | ||||
|---|---|---|---|---|
|
bool Geo::RastFragment::IsPtInPoly
...
public: bool IsPtInPoly
(
float x,
float y
) const
...
is a given point in the fragment polygon?