FGFS-4.1/OpenSceneGraph
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Added getPerspective() method to Matrix* and SceneView

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This commit is contained in:
Robert Osfield
2003-09-29 13:14:34 +00:00
parent a1d0ebece0
commit 7d69f8e193
6 changed files with 128 additions and 53 deletions
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42
src/osg/Matrix_implementation.cpp
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@@ -56,10 +56,10 @@ void Matrix_implementation::set( value_type a00, value_type a01, value_type a02,
SET_ROW(3, a30, a31, a32, a33 )
}
#define QX q._fv[0]
#define QY q._fv[1]
#define QZ q._fv[2]
#define QW q._fv[3]
#define QX q._v[0]
#define QY q._v[1]
#define QZ q._v[2]
#define QW q._v[3]
void Matrix_implementation::set(const Quat& q)
{
@@ -420,10 +420,12 @@ void Matrix_implementation::makeOrtho(double left, double right,
SET_ROW(3, tx, ty, tz, 1.0f )
}
void Matrix_implementation::getOrtho(double& left, double& right,
bool Matrix_implementation::getOrtho(double& left, double& right,
double& bottom, double& top,
double& zNear, double& zFar)
{
if (_mat[0][3]!=0.0f || _mat[1][3]==!0.0f || _mat[2][3]!=0.0f || _mat[3][3]!=1.0f) return false;
zNear = (_mat[3][2]+1.0f) / _mat[2][2];
zFar = (_mat[3][2]-1.0f) / _mat[2][2];
@@ -432,6 +434,8 @@ void Matrix_implementation::getOrtho(double& left, double& right,
bottom = -(1.0f+_mat[3][1]) / _mat[1][1];
top = (1.0f-_mat[3][1]) / _mat[1][1];
return true;
}
@@ -450,10 +454,13 @@ void Matrix_implementation::makeFrustum(double left, double right,
SET_ROW(3, 0.0f, 0.0f, D, 0.0f )
}
void Matrix_implementation::getFrustum(double& left, double& right,
double& bottom, double& top,
double& zNear, double& zFar)
bool Matrix_implementation::getFrustum(double& left, double& right,
double& bottom, double& top,
double& zNear, double& zFar)
{
if (_mat[0][3]!=0.0f || _mat[1][3]==!0.0f || _mat[2][3]!=-1.0f || _mat[3][3]!=0.0f) return false;
zNear = _mat[3][2] / (_mat[2][2]-1.0f);
zFar = _mat[3][2] / (1.0f+_mat[2][2]);
@@ -462,11 +469,13 @@ void Matrix_implementation::getFrustum(double& left, double& right,
top = zNear * (1.0f+_mat[2][1]) / _mat[1][1];
bottom = zNear * (_mat[2][1]-1.0f) / _mat[1][1];
return true;
}
void Matrix_implementation::makePerspective(double fovy,double aspectRatio,
double zNear, double zFar)
double zNear, double zFar)
{
// calculate the appropriate left, right etc.
double tan_fovy = tan(DegreesToRadians(fovy*0.5));
@@ -477,6 +486,21 @@ void Matrix_implementation::makePerspective(double fovy,double aspectRatio,
makeFrustum(left,right,bottom,top,zNear,zFar);
}
bool Matrix_implementation::getPerspective(double& fovy,double& aspectRatio,
double& zNear, double& zFar)
{
double right = 0.0;
double left = 0.0;
double top = 0.0;
double bottom = 0.0;
if (getFrustum(left,right,bottom,top,zNear,zFar))
{
fovy = RadiansToDegrees(atan(top/zNear)-atan(bottom/zNear));
aspectRatio = (right-left)/(top-bottom);
return true;
}
return false;
}
void Matrix_implementation::makeLookAt(const Vec3& eye,const Vec3& center,const Vec3& up)
{