use asset arena for manual models

src/main.cpp

@@ -65,17 +65,24 @@ initEllipseEntity(RenderState* rs,
 	TwoBodySystem* system,
 	u32 num_vertices)
 {
-	system->e3d = ellipseInit3D(system->ep, num_vertices);
-	Mesh* m = meshInit(rs->rg_arena, num_vertices, num_vertices, false, true);
-	vec3 vertex_color = vec3(255, 0, 255);
-
-	for (uint i = 0; i < system->e3d.vert_count; i++) {
-		m->vertices[i] = system->e3d.vertices[i];
-		m->colors[i] = vertex_color;
+	// FIXME: it might be worth using stack memory here, and in
+	// 	initSatelliteEntity(), so we're not storing basically the same model
+	// 	over and over with just different vertices
+	// 	Could also use a temporary arena maybe?
+	e3d = ellipse3DInit(ep, num_vertices);
+	Mesh* m = meshInit(rs->assets.arena,
+					num_vertices,
+					num_vertices,
+					false,
+					true);
+
+	for (uint i = 0; i < e3d.vert_count; i++) {
+		m->vertices[i] = e3d.vertices[i];
+		m->colors[i] = DEFAULT_ELLIPSE_COLOR;
 		m->indices[i] = i;
 	}
 
-	Model* mdl = modelInitManual(rs->rg_arena, 1, m);
+	Model* mdl = modelInitManual(rs->assets.arena, 1, m);
 	RenderGroup* rg = getRenderGroupByName(rs, "manual mesh group");
 	Entity* e = getFreeEntity(rg);
 	initEntity(e, rs->gl_ctx,
@@ -115,7 +122,12 @@ initSatelliteEntity(RenderState* rs, const char* name)
 {
 	u32 num_vertices = 3;
 	vec3 vertex_color = vec3(255, 0, 0);
-	Mesh* m = meshInit(rs->rg_arena, num_vertices, num_vertices, false, true);
+	Mesh* m = meshInit(rs->assets.arena,
+					num_vertices,
+					num_vertices,
+					false,
+					true);
+
 	m->vertices[0] = vec3(0, 1, 0);
 	m->colors[0] = vertex_color;
 	m->indices[0] = 0;
@@ -126,7 +138,7 @@ initSatelliteEntity(RenderState* rs, const char* name)
 	m->colors[2] = vertex_color;
 	m->indices[2] = 2;
 
-	Model* mdl = modelInitManual(rs->rg_arena, 1, m);
+	Model* mdl = modelInitManual(rs->assets.arena, 1, m);
 	RenderGroup* rg = getRenderGroupByName(rs, "manual mesh group");
 	Entity* e = getFreeEntity(rg);
 	initEntity(e, rs->gl_ctx,