#include "WaveMesh.h"

float WaveMesh::heightMap(std::size_t nx, std::size_t ny) const {
    float x = _xs[nx];
    float y = _xs[ny];
    float d = 50*sqrtf(x*x + y*y);
    return cosf(d - _shift)*expf(-d/10.0f)/2;
}

float WaveMesh::heightMap(float fx, float fy) const {
	float d = 50*sqrtf(fx*fx + fy*fy);
	return cosf(d - _shift)*expf(-d/10.0f)/2;
}

void WaveMesh::setShift(float shift) {
	_shift = shift;
	update();
}

WaveMesh::WaveMesh(ShaderProgram *shader, std::size_t size): Mesh(shader, size), _shift(0) {
    float step = 1.0f/size;
    for(std::size_t i = 0; i < size; ++i) {
        _xs[i] = step*i - 0.5f;
        _ys[i] = _xs[i];
    }
}

WaveMesh::~WaveMesh() {

}