add engine version

1 files changed, 89 insertions, 0 deletions

diff --git a/engine-ocean/Game/Ocean/ocean.h b/engine-ocean/Game/Ocean/ocean.h
new file mode 100644
index 0000000..b2abe87
--- /dev/null
+++ b/engine-ocean/Game/Ocean/ocean.h
@@ -0,0 +1,89 @@
+#ifndef ocean_H
+#define ocean_H
+
+#include <map>
+#include <vector>
+#include <utility>
+#include <Eigen/Dense>
+
+// for every 1d index up to length*width
+struct WaveIndexConstant{
+    Eigen::Vector2d h0_prime = Eigen::Vector2d(0.f, 0.f);
+    Eigen::Vector2d h0_prime_conj = Eigen::Vector2d(0.f, 0.f);
+
+    double w_prime = 0.0;
+
+
+    Eigen::Vector2d base_horiz_pos = Eigen::Vector2d(0.f, 0.f); // static horiz pos with no displacement
+    Eigen::Vector2d k_vector = Eigen::Vector2d(0.f, 0.f); // static horiz pos with no displacement
+
+
+
+};
+
+class ocean
+{
+public:
+    ocean();
+    void updateVertexAmplitudes(double t);
+    std::vector<Eigen::Vector3f> get_vertices();
+    std::vector<Eigen::Vector3i> get_faces();
+    void fft_prime(double t);
+
+
+
+
+
+private:
+
+    Eigen::Vector2i index_1d_to_2d(int i);
+    Eigen::Vector2d get_k_vector(int n_prime, int m_prime);
+    double phillips_prime(Eigen::Vector2d k);
+    Eigen::Vector2d h_0_prime(Eigen::Vector2d k);
+    double omega_prime(Eigen::Vector2d k);
+    void init_wave_index_constants();
+    Eigen::Vector2d complex_exp(double exponent);
+    Eigen::Vector2d h_prime_t(int i, double t);
+    Eigen::Vector2d get_horiz_pos(int i);
+    std::pair<double, double> sample_complex_gaussian();
+    std::vector<Eigen::Vector2d> fast_fft(std::vector<Eigen::Vector2d> h);
+
+
+
+
+
+
+
+
+
+    std::map<int, WaveIndexConstant> m_waveIndexConstants; // stores constants that only need to be calculate once for each grid constant
+
+
+
+    const double Lx = 10.0;
+    const double Lz = 10.0;
+
+    const int num_rows = 8;
+    const int num_cols = 8;
+
+    const int N = num_rows*num_cols; // total number of grid points
+    const double lambda = .40; // how much displacement matters
+    const double spacing = 35.0; // spacing between grid points
+
+    const double A = 1.0; // numeric constant for the Phillips spectrum
+    const double V = 5.5; // wind speed
+    const double gravity = 9.81;
+    const double L = V*V/gravity;
+    const Eigen::Vector2d omega_wind = Eigen::Vector2d(1.0, 0.0); // wind direction, used in Phillips equation
+
+    std::vector<Eigen::Vector2d> m_current_h; // current height fields for each K
+    std::vector<Eigen::Vector2d> m_displacements; // current displacement vector for each K
+
+
+
+    const double D = 1.0; // Depth below mean water level (for dispersion relation)
+
+
+};
+
+#endif // ocean_H