#include "Body.hpp"
#include "Planet.hpp"
+#include "Simulation.hpp"
#include "Sun.hpp"
#include "Tile.hpp"
+#include "../const.hpp"
#include "../app/Assets.hpp"
#include "../graphics/Viewport.hpp"
#include <algorithm>
+#include <cmath>
+#include <glm/gtx/transform.hpp>
+
+using blobs::G;
+using blobs::PI_2p0;
+
+using std::sin;
+using std::cos;
+using std::pow;
+using std::sqrt;
namespace blobs {
namespace world {
Body::Body()
-: parent(nullptr)
+: sim(nullptr)
+, parent(nullptr)
, children()
, mass(1.0)
-, radius(1.0) {
+, radius(1.0)
+, sma(1.0)
+, ecc(0.0)
+, inc(0.0)
+, asc(0.0)
+, arg(0.0)
+, mna(0.0) {
}
Body::~Body() {
}
+void Body::SetSimulation(Simulation &s) noexcept {
+ sim = &s;
+ for (auto child : children) {
+ child->SetSimulation(s);
+ }
+}
+
void Body::SetParent(Body &p) {
if (HasParent()) {
UnsetParent();
void Body::AddChild(Body &c) {
children.push_back(&c);
+ c.SetSimulation(*sim);
}
void Body::RemoveChild(Body &c) {
}
}
+double Body::Mass() const noexcept {
+ return mass;
+}
+
+void Body::Mass(double m) noexcept {
+ mass = m;
+}
+
+double Body::Radius() const noexcept {
+ return radius;
+}
+
+void Body::Radius(double r) noexcept {
+ radius = r;
+}
+
+double Body::SemiMajorAxis() const noexcept {
+ return sma;
+}
+
+void Body::SemiMajorAxis(double s) noexcept {
+ sma = s;
+}
+
+double Body::Eccentricity() const noexcept {
+ return ecc;
+}
+
+void Body::Eccentricity(double e) noexcept {
+ ecc = e;
+}
+
+double Body::Inclination() const noexcept {
+ return inc;
+}
+
+void Body::Inclination(double i) noexcept {
+ inc = i;
+}
+
+double Body::LongitudeAscending() const noexcept {
+ return asc;
+}
+
+void Body::LongitudeAscending(double l) noexcept {
+ asc = l;
+}
+
+double Body::ArgumentPeriapsis() const noexcept {
+ return arg;
+}
+
+void Body::ArgumentPeriapsis(double a) noexcept {
+ arg = a;
+}
+
+double Body::MeanAnomaly() const noexcept {
+ return mna;
+}
+
+void Body::MeanAnomaly(double m) noexcept {
+ mna = m;
+}
+
+double Body::GravitationalParameter() const noexcept {
+ return G * Mass();
+}
+
+double Body::OrbitalPeriod() const noexcept {
+ if (parent) {
+ return PI_2p0 * sqrt((sma * sma * sma) / (G * (parent->Mass() + Mass())));
+ } else {
+ return 0.0;
+ }
+}
+
+glm::mat4 Body::ToParent() const noexcept {
+ if (!parent) {
+ return glm::mat4(1.0f);
+ }
+
+ double T = OrbitalPeriod();
+
+ double M = mna + PI_2p0 * (GetSimulation().Time() / T); // + time
+
+ double E = M; // eccentric anomaly, solve M = E - e sin E
+ while (true) {
+ double dE = (E - ecc * sin(E) - M) / (1 - ecc * cos(E));
+ E -= dE;
+ if (abs(dE) < 1.0e-6) break;
+ }
+
+ // coordinates in orbital plane
+ double P = sma * (cos(E) - ecc);
+ double Q = sma * sin(E) * sqrt(1 - (ecc * ecc));
+
+ // tile by argument of periapsis, …
+ double x = cos(arg) * P - sin(arg) * Q;
+ double y = sin(arg) * P + cos(arg) * Q;
+ // …inclination, …
+ double z = sin(inc) * x;
+ x = cos(inc) * x;
+ // …and longitude of ascending node
+ glm::vec3 pos(
+ cos(asc) * x - sin(asc) * y,
+ sin(asc) * x + cos(asc) * y,
+ z);
+
+ // TODO: calculate complete matrix
+ return glm::translate(-pos);
+}
+
+glm::mat4 Body::FromParent() const noexcept {
+ if (!parent) {
+ return glm::mat4(1.0f);
+ }
+ // TODO: calculate real position
+ return glm::translate(glm::vec3(-sma, 0.0f, 0.0f));
+}
+
Planet::Planet(int sidelength)
: Body()
vao.ReserveElements(TilesTotal() * 6, GL_STATIC_DRAW);
{
auto element = vao.MapElements(GL_WRITE_ONLY);
- for (int index = 0, surface = 0; surface < 6; ++surface) {
+ int index = 0;
+ for (int surface = 0; surface < 3; ++surface) {
+ for (int y = 0; y < sidelength; ++y) {
+ for (int x = 0; x < sidelength; ++x, ++index) {
+ element[6 * index + 0] = 4 * index + 0;
+ element[6 * index + 1] = 4 * index + 2;
+ element[6 * index + 2] = 4 * index + 1;
+ element[6 * index + 3] = 4 * index + 1;
+ element[6 * index + 4] = 4 * index + 2;
+ element[6 * index + 5] = 4 * index + 3;
+ }
+ }
+ }
+ for (int surface = 3; surface < 6; ++surface) {
for (int y = 0; y < sidelength; ++y) {
for (int x = 0; x < sidelength; ++x, ++index) {
element[6 * index + 0] = 4 * index + 0;
void Planet::Draw(app::Assets &assets, graphics::Viewport &viewport) {
vao.Bind();
- // TODO: premultiply normal with model matrix (i.e. just take it from M)
- assets.shaders.planet_surface.SetNormal(glm::vec3(0.0f, 0.0f, 1.0f));
- vao.DrawTriangles(TilesTotal() * 4, TilesTotal() * 4 * 0);
- assets.shaders.planet_surface.SetNormal(glm::vec3(1.0f, 0.0f, 0.0f));
- vao.DrawTriangles(TilesTotal() * 4, TilesTotal() * 4 * 1);
- assets.shaders.planet_surface.SetNormal(glm::vec3(0.0f, 1.0f, 0.0f));
- vao.DrawTriangles(TilesTotal() * 4, TilesTotal() * 4 * 2);
- assets.shaders.planet_surface.SetNormal(glm::vec3(0.0f, 0.0f, -1.0f));
- vao.DrawTriangles(TilesTotal() * 4, TilesTotal() * 4 * 3);
- assets.shaders.planet_surface.SetNormal(glm::vec3(-1.0f, 0.0f, 0.0f));
- vao.DrawTriangles(TilesTotal() * 4, TilesTotal() * 4 * 4);
- assets.shaders.planet_surface.SetNormal(glm::vec3(0.0f, -1.0f, 0.0f));
- vao.DrawTriangles(TilesTotal() * 4, TilesTotal() * 4 * 5);
+ const glm::mat4 &MV = assets.shaders.planet_surface.MV();
+ assets.shaders.planet_surface.SetNormal(glm::vec3(MV * glm::vec4(0.0f, 0.0f, 1.0f, 0.0f)));
+ vao.DrawTriangles(TilesPerSurface() * 6, TilesPerSurface() * 6 * 0);
+ assets.shaders.planet_surface.SetNormal(glm::vec3(MV * glm::vec4(1.0f, 0.0f, 0.0f, 0.0f)));
+ vao.DrawTriangles(TilesPerSurface() * 6, TilesPerSurface() * 6 * 1);
+ assets.shaders.planet_surface.SetNormal(glm::vec3(MV * glm::vec4(0.0f, 1.0f, 0.0f, 0.0f)));
+ vao.DrawTriangles(TilesPerSurface() * 6, TilesPerSurface() * 6 * 2);
+ assets.shaders.planet_surface.SetNormal(glm::vec3(MV * glm::vec4(0.0f, 0.0f, -1.0f, 0.0f)));
+ vao.DrawTriangles(TilesPerSurface() * 6, TilesPerSurface() * 6 * 3);
+ assets.shaders.planet_surface.SetNormal(glm::vec3(MV * glm::vec4(-1.0f, 0.0f, 0.0f, 0.0f)));
+ vao.DrawTriangles(TilesPerSurface() * 6, TilesPerSurface() * 6 * 4);
+ assets.shaders.planet_surface.SetNormal(glm::vec3(MV * glm::vec4(0.0f, -1.0f, 0.0f, 0.0f)));
+ vao.DrawTriangles(TilesPerSurface() * 6, TilesPerSurface() * 6 * 5);
}
projects / blobs.git / blobdiff