Integrate Perlin noise switch

Also make Perlin noise ground wider and less ugly

main_bounce.cpp

@@ -2,6 +2,8 @@
  * bouncing implicit-surface defined sphere.
  **/
 
+#include <cstring>
+
 #include "render/GlutRender.hpp"
 #include "Ball.hpp"
 #include "FlatGround.hpp"
@@ -11,26 +13,45 @@
 #include "periodic_updates.hpp"
 
 int main(int argc, char** argv) {
+    bool perlin = false;
+    for(int pos=1; pos < argc; ++pos) {
+        if(strcmp(argv[pos], "-perlin") == 0)
+            perlin = true;
+    }
+
+    // Last minute switch, this code is ugly, please close your eyes until
+    // stated otherwise.
+    PerlinGround perlin_ground;
+    FlatGround flat_ground;
+    GroundFlatMesh ground_mesh(Point(0., 0., 0.), 0.05);
+    Ground* ball_ground = nullptr;
+    if(perlin)
+        ball_ground = &perlin_ground;
+    else
+        ball_ground = &flat_ground;
+    // You can open your eyes, now.
 
-    PerlinGround* flat = new PerlinGround();
     GlutRender& render = GlutRender::get_instance();
     render.init(&argc, argv, 640, 480, "Bouncing stuff");
 
-    Ball ball(Point(0, 5, 0), flat, 0.55, -.5, -.7, 1, 1);
+    Ball ball(Point(0, 5, 0), ball_ground, 0.55, -.5, -.7, 1, 1);
     ball.get_surface()->set_color(Color(1., 0., 0.));
 
     Cuboid bbox = ball.get_surface()->max_bounding_box();
-    Cuboid bbox_2(Point(-2, -1, -2), Point(2,1,2));
+    Cuboid bbox_2(Point(-20, -2, -20), Point(20,2,20));
     printf("%.2lf %.2lf %.2lf | %.2lf %.2lf %.2lf\n",
             bbox.low(0), bbox.low(1), bbox.low(2),
             bbox.high(0), bbox.high(1), bbox.high(2));
     render.add_surface(ball.get_surface(), bbox);
-    render.add_surface(flat->get_surface(), bbox_2);
 
-
-    GroundFlatMesh ground(Point(0., 0., 0.), 0.05);
-    ground.get_mesh()->set_color(Color(0.13, 0.82, 0.21));
-    render.add_mesh(ground.get_mesh());
+    if(perlin) {
+        perlin_ground.get_surface()->set_color(Color(0.13, 0.82, 0.21));
+        render.add_surface(perlin_ground.get_surface(), bbox_2, 1);
+    }
+    else {
+        ground_mesh.get_mesh()->set_color(Color(0.13, 0.82, 0.21));
+        render.add_mesh(ground_mesh.get_mesh());
+    }
 
     render.set_idle_func(periodic_update);
     init_periodic_static(&ball);

render/GlutRender.cpp

@@ -74,12 +74,14 @@ void GlutRender::remove_mesh(Mesh* mesh) {
     meshes.erase(mesh);
 }
 
-void GlutRender::add_surface(ImplicitSurface* surf, const Cuboid& box) {
-    surfaces.insert(SurfaceDetails(surf, box));
+void GlutRender::add_surface(ImplicitSurface* surf, const Cuboid& box,
+        double resolution)
+{
+    surfaces.insert(SurfaceDetails(surf, box, resolution));
 }
 
 void GlutRender::remove_surface(ImplicitSurface* surf) {
-    surfaces.erase(SurfaceDetails(surf, Cuboid::empty()));
+    surfaces.erase(SurfaceDetails(surf, Cuboid::empty(), 0.1));
 }
 
 void GlutRender::run() {
@@ -190,7 +192,8 @@ void GlutRender::display() {
     }
 
     for(const SurfaceDetails& surface: surfaces) {
-        Mesh mesh = MarchingCubes(*surface.surface, surface.box)
+        Mesh mesh = MarchingCubes(*surface.surface, surface.box,
+                surface.resolution)
             .add_hint(surface.surface->location_hint())
             ();
         display_mesh(mesh);

render/GlutRender.hpp

@@ -18,7 +18,8 @@ class GlutRender {
         void cleanup();
         void add_mesh(Mesh* mesh);
         void remove_mesh(Mesh* mesh);
-        void add_surface(ImplicitSurface* surf, const Cuboid& box);
+        void add_surface(ImplicitSurface* surf, const Cuboid& box,
+                double resolution=0.1);
         void remove_surface(ImplicitSurface* surf);
         void run();
 
@@ -26,11 +27,13 @@ class GlutRender {
 
     private:
         struct SurfaceDetails {
-            SurfaceDetails(ImplicitSurface* surf, const Cuboid& box):
-                surface(surf), box(box) {}
+            SurfaceDetails(ImplicitSurface* surf, const Cuboid& box,
+                    double resolution):
+                surface(surf), box(box), resolution(resolution) {}
 
             ImplicitSurface* surface;
             Cuboid box;
+            double resolution;
 
             bool operator<(const SurfaceDetails& oth) const {
                 return surface < oth.surface;