public static Matrix4F Ortho(float left, float right, float bottom, float top, float near, float far)
{
var matrix = default(Matrix4F);
var rml = right - left;
var fmn = far - near;
var tmb = top - bottom;
// ReSharper disable CompareOfFloatsByEqualityOperator
if (rml == 0.0 || fmn == 0.0 || tmb == 0.0)
{
throw new Exception("Invalid matrix");
}
var _1OverRml = 1.0f / rml;
var _1OverFmn = 1.0f / fmn;
var _1OverTmb = 1.0f / tmb;
matrix.Row0 = Vector4f.Create(2.0f * _1OverRml, 0, 0, 0);
matrix.Row1 = Vector4f.Create(0, 2.0f * _1OverTmb, 0, 0);
matrix.Row2 = Vector4f.Create(0, 0, -2.0f * _1OverFmn, 0);
matrix.Row3 = Vector4f.Create(
-(right + left) * _1OverRml,
-(top + bottom) * _1OverTmb,
-(far + near) * _1OverFmn,
1.0f
);
return(matrix);
}
public Vector4f Column(int n)
{
return(Vector4f.Create(Row0[n], Row1[n], Row2[n], Row3[n]));
}