From 94df6a528c8dc77c56795dad0b8b03f6ef1affa5 Mon Sep 17 00:00:00 2001
From: Allanis <allanis.saracraft.studios@gmail.com>
Date: Sat, 25 Nov 2017 13:14:10 +0000
Subject: [PATCH] [Add] Stars glow right?!

---
 src/star.cpp | 28 ++++++++++++++++++++++++++++
 1 file changed, 28 insertions(+)

diff --git a/src/star.cpp b/src/star.cpp
index 53739e1..dd6b3a1 100644
--- a/src/star.cpp
+++ b/src/star.cpp
@@ -16,6 +16,33 @@ void Star::SetPosition(vector3d p) {
   pos = p;
 }
 
+static void DrawCorona(double rad, vector3d& pos, const float col[3]) {
+  glPushMatrix();
+  /* Face the camera damnit! */
+  vector3d dir = vector3d::Normalize(pos);
+  vector3d d2  = vector3d(0, 1, 0);
+  vector3d d3  = vector3d::Cross(dir, d2);
+  d3.Normalize();
+  d2 = vector3d::Cross(dir, d3);
+  matrix4x4d rot = matrix4x4d::MakeRotMatrix(d3, d2, dir);
+  glMultMatrixd(&rot[0]);
+
+  glEnable(GL_BLEND);
+  glDisable(GL_CULL_FACE);
+  glBegin(GL_TRIANGLE_FAN);
+    glColor4f(col[0], col[1], col[2], 1);
+    glVertex3f(0, 0, 0);
+    glColor4f(0, 0, 0, 0);
+    for(float ang = 0; ang < 2*M_PI; ang += 0.2) {
+      glVertex3f(rad*sin(ang), rad*cos(ang), 0);
+    }
+    glVertex3f(0, rad, 0);
+  glEnd();
+  glEnable(GL_CULL_FACE);
+  glDisable(GL_BLEND);
+  glPopMatrix();
+}
+
 void Star::Render(const Frame* a_camFrame) {
   glDisable(GL_LIGHTING);
   glDisable(GL_DEPTH_TEST);
@@ -36,6 +63,7 @@ void Star::Render(const Frame* a_camFrame) {
   
   glColor3fv(StarSystem::starColors[type]);
   gluSphere(L3D::gluQuadric, rad, 100, 100);
+  DrawCorona(rad*4, fpos, StarSystem::starColors[type]);
   glPopMatrix();
   glEnable(GL_DEPTH_TEST);
   glEnable(GL_LIGHTING);