From: John Tsiombikas <nuclear@member.fsf.org>
Date: Fri, 12 Jan 2018 04:43:25 +0000 (+0200)
Subject: fixed div/zero in blob exhibit
X-Git-Url: http://git.mutantstargoat.com/user/nuclear/?p=laserbrain_demo;a=commitdiff_plain;h=fa954e4716d12939552b592f46a4e08405ecfb24

fixed div/zero in blob exhibit
---

diff --git a/src/app.cc b/src/app.cc
index dcfd3f3..869af78 100644
--- a/src/app.cc
+++ b/src/app.cc
@@ -79,6 +79,12 @@ bool app_init(int argc, char **argv)
 {
 	set_log_file("demo.log");
 
+	char *env = getenv("FPEXCEPT");
+	if(env && atoi(env)) {
+		info_log("enabling floating point exceptions\n");
+		enable_fpexcept();
+	}
+
 	if(init_opengl() == -1) {
 		return false;
 	}
diff --git a/src/blob_exhibit.cc b/src/blob_exhibit.cc
index 58522d9..c92ac7a 100644
--- a/src/blob_exhibit.cc
+++ b/src/blob_exhibit.cc
@@ -23,6 +23,7 @@ static Metaball def_mball_data[] = {
 };
 
 struct BlobPriv {
+	AABox vol;
 	metasurface *msurf;
 	Metaball mballs[NUM_MBALLS];
 	Texture *tex;
@@ -34,6 +35,7 @@ BlobExhibit::BlobExhibit()
 	for(int i=0; i<NUM_MBALLS; i++) {
 		priv->mballs[i] = def_mball_data[i];
 	}
+	priv->vol = AABox(Vec3(-3.5, -3.5, -3.5), Vec3(3.5, 3.5, 3.5));
 }
 
 BlobExhibit::~BlobExhibit()
@@ -49,7 +51,8 @@ bool BlobExhibit::init()
 	}
 	msurf_set_threshold(priv->msurf, 8);
 	msurf_set_inside(priv->msurf, MSURF_GREATER);
-	msurf_set_bounds(priv->msurf, -3.5, -3.5, -3.5, 3.5, 3.5, 3.5);
+	msurf_set_bounds(priv->msurf, priv->vol.min.x, priv->vol.min.y, priv->vol.min.z,
+			priv->vol.max.x, priv->vol.max.y, priv->vol.max.z);
 	msurf_enable(priv->msurf, MSURF_NORMALIZE);
 
 	priv->tex = texman.get_texture("data/sphmap.jpg");
@@ -72,6 +75,10 @@ void BlobExhibit::update(float dt)
 	float xmin, xmax, ymin, ymax, zmin, zmax;
 	int xres, yres, zres;
 
+	if(!msurf_voxels(priv->msurf)) {
+		return;
+	}
+
 	msurf_get_bounds(priv->msurf, &xmin, &ymin, &zmin, &xmax, &ymax, &zmax);
 	msurf_get_resolution(priv->msurf, &xres, &yres, &zres);
 
@@ -86,10 +93,6 @@ void BlobExhibit::update(float dt)
 		priv->mballs[i].pos.z = -cos(t) * priv->mballs[i].path_scale.z + priv->mballs[i].path_offset.z;
 	}
 
-	if(!msurf_voxels(priv->msurf)) {
-		return;
-	}
-
 	float max_energy = 0.0f;
 
 #pragma omp parallel for
@@ -183,3 +186,10 @@ void BlobExhibit::draw() const
 
 	glPopAttrib();
 }
+
+const AABox &BlobExhibit::get_aabox() const
+{
+	Box box = Box(priv->vol, node->get_matrix());
+	calc_bounding_aabox(&aabb, &box);
+	return aabb;
+}