public static Mat4 Translate(Vec3 offset)
{
Mat4 result = Mat4.identity();
result[3] = new Vec4(offset, 1.0f);
return(result);
}
public static void SetNone()
{
Shader shader = Shader.GetUberShader();
shader.Draw();
var viewLoc = shader.GetLocation("View");
shader.SetMat4(viewLoc, Mat4.identity());
}
public static Mat4 RotateZ(float angle)
{
Mat4 result = Mat4.identity();
result[0][0] = MathF.Cos(angle);
result[0][1] = -MathF.Sin(angle);
result[1][0] = MathF.Sin(angle);
result[1][1] = MathF.Cos(angle);
return(result);
}
public static Mat4 Ortho(float left, float right, float bottom, float top, float zNear, float zFar)
{
Mat4 result = Mat4.identity();
result[0][0] = 2.0F / (right - left);
result[1][1] = 2.0F / (top - bottom);
result[2][2] = -2.0F / (zFar - zNear);
result[3][0] = -(right + left) / (right - left);
result[3][1] = -(top + bottom) / (top - bottom);
result[3][2] = -(zFar + zNear) / (zFar - zNear);
result[3][3] = 1.0f;
return(result);
}
public static Mat4 LookAt(Vec3 eye, Vec3 at, Vec3 up)
{
Vec3 f = (at - eye).Normalize();
Vec3 s = up.Cross(f).Normalize();
Vec3 u = f.Cross(s);
Mat4 res = Mat4.identity();
res[0][0] = s.x;
res[1][0] = s.y;
res[2][0] = s.z;
res[0][1] = u.x;
res[1][1] = u.y;
res[2][1] = u.z;
res[0][2] = f.x;
res[1][2] = f.y;
res[2][2] = f.z;
res[3][0] = -s.Dot(eye);
res[3][1] = -u.Dot(eye);
res[3][2] = -f.Dot(eye);
return(res);
}