From 285f5bec5bb03d4e825e5d866e94008088dd6155 Mon Sep 17 00:00:00 2001
From: xleroy <xleroy@fca1b0fc-160b-0410-b1d3-a4f43f01ea2e>
Date: Sat, 9 Aug 2008 08:06:33 +0000
Subject: Ajout nouveaux tests

git-svn-id: https://yquem.inria.fr/compcert/svn/compcert/trunk@708 fca1b0fc-160b-0410-b1d3-a4f43f01ea2e
---
 test/raytracer/simplify.c | 177 ++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 177 insertions(+)
 create mode 100644 test/raytracer/simplify.c

(limited to 'test/raytracer/simplify.c')

diff --git a/test/raytracer/simplify.c b/test/raytracer/simplify.c
new file mode 100644
index 00000000..7a4a5457
--- /dev/null
+++ b/test/raytracer/simplify.c
@@ -0,0 +1,177 @@
+#include "config.h"
+#include "point.h"
+#include "vector.h"
+#include "arrays.h"
+#include "matrix.h"
+#include "eval.h"
+#include "object.h"
+#include "simplify.h"
+
+#define INFINITE_RADIUS 1e300
+
+static flt cone_radius = 1.0;
+static flt cube_radius = 0.86602540378443859659; /* sqrt(3)/2 */
+static flt cylinder_radius = 1.11803398874989490253; /* sqrt(5)/2 */
+static flt sphere_radius = 1.0;
+
+static struct point cone_center = { 0.0, 1.0, 0.0 };
+static struct point cube_center = { 0.5, 0.5, 0.5 };
+static struct point cylinder_center = { 0.0, 0.5, 0.0 };
+static struct point sphere_center = { 0, 0, 0 };
+static struct point plane_center = { 0, 0, 0 };
+
+static struct point origin = { 0, 0, 0 };
+
+static inline void set_infinite(struct object * t)
+{
+  t->radius = INFINITE_RADIUS;
+}
+
+static inline void union_bs(struct object * t1, struct object * t2,
+                            struct object * obj)
+{
+  struct vector c1c2;
+  flt dd2, rr, rr2, d, alpha;
+
+  if (t1->radius >= INFINITE_RADIUS || t2->radius >= INFINITE_RADIUS) {
+    obj->radius = INFINITE_RADIUS;
+    return;
+  }
+  between(&t1->center, &t2->center, &c1c2);
+  dd2 = vlength2(&c1c2);
+  rr = t2->radius - t1->radius;
+  rr2 = rr * rr;
+  if (dd2 <= rr2) {
+    /* take the biggest sphere */
+    if (t1->radius <= t2->radius) {
+      ASSIGN(obj->center, t2->center);
+      obj->radius = t2->radius;
+      set_infinite(t2);
+    } else {
+      ASSIGN(obj->center, t1->center);
+      obj->radius = t1->radius;
+      set_infinite(t1);
+    }
+    return;
+  }
+  d = sqrt(dd2);
+  alpha = rr / (2 * d) + 0.5;
+  point_along(&t1->center, &c1c2, alpha, &obj->center);
+  obj->radius = (d + t1->radius + t2->radius) / 2;
+}
+
+static inline void intersection_bs(struct object * t1, struct object * t2,
+                                   struct object * obj)
+{
+  struct vector c1c2;
+  flt dd2, rr, rr2, rpr, rpr2, diff, d, te1, te2, te3, te4, te, alpha;
+
+  if (t1->radius >= INFINITE_RADIUS) {
+    ASSIGN(obj->center, t2->center);
+    obj->radius = t2->radius;
+    return;
+  }
+  if (t2->radius >= INFINITE_RADIUS) {
+    ASSIGN(obj->center, t1->center);
+    obj->radius = t1->radius;
+    return;
+  }
+  between(&t1->center, &t2->center, &c1c2);
+  dd2 = vlength2(&c1c2);
+  rr = t1->radius - t2->radius;
+  rr2 = rr * rr;
+  if (dd2 <= rr2) {
+    /* take the smallest sphere */
+    if (t2->radius <= t1->radius) {
+      ASSIGN(obj->center, t2->center);
+      obj->radius = t2->radius;
+      set_infinite(t2);
+    } else {
+      ASSIGN(obj->center, t1->center);
+      obj->radius = t1->radius;
+      set_infinite(t1);
+    }
+    return;
+  }
+  rpr = t1->radius + t2->radius;
+  rpr2 = rpr * rpr;
+  if (dd2 > rpr2) {
+    ASSIGN(obj->center, origin);
+    obj->radius = 0.0;
+    return;
+  }
+  diff = t1->radius * t1->radius - t2->radius * t2->radius;
+  if (dd2 <= diff) {
+    ASSIGN(obj->center, t2->center);
+    obj->radius = t2->radius;
+    set_infinite(t2);
+    return;
+  }
+  if (dd2 <= -diff) {
+    ASSIGN(obj->center, t1->center);
+    obj->radius = t1->radius;
+    set_infinite(t1);
+    return;
+  }
+  d = sqrt(dd2);
+  te1 = t1->radius + d + t2->radius;
+  te2 = t1->radius + d - t2->radius;
+  te3 = t2->radius + d - t1->radius;
+  te4 = t1->radius + t2->radius - d;
+  te = (sqrt (te1 * te2 * te3 * te4)) / (2 * d);
+  alpha =
+    (t1->radius * t1->radius - t2->radius * t2->radius) / (2 * dd2) + 0.5;
+  point_along(&t1->center, &c1c2, alpha, &obj->center);
+  obj->radius = te;
+}
+
+static inline void difference_bs(struct object * t1, struct object * t2,
+                                   struct object * obj)
+{
+  ASSIGN(obj->center, t1->center);
+  obj->radius = t1->radius;
+  set_infinite(t1);
+}
+
+void compute_bounding_spheres(struct object * obj)
+{
+  if (obj->radius >= 0.0) return; /* already computed */
+  switch (obj->kind) {
+  case Cone:
+    apply_to_point(obj->obj2world, &cone_center, &obj->center);
+    obj->radius = obj->max_scale_applied * cone_radius;
+    break;
+  case Cube:
+    apply_to_point(obj->obj2world, &cube_center, &obj->center);
+    obj->radius = obj->max_scale_applied * cube_radius;
+    break;
+  case Cylinder:
+    apply_to_point(obj->obj2world, &cylinder_center, &obj->center);
+    obj->radius = obj->max_scale_applied * cylinder_radius;
+    break;
+  case Plane:
+    ASSIGN(obj->center, plane_center);
+    obj->radius = INFINITE_RADIUS;
+    break;
+  case Sphere:
+    apply_to_point(obj->obj2world, &sphere_center, &obj->center);
+    obj->radius = obj->max_scale_applied * sphere_radius;
+    break;
+  case Union:
+    compute_bounding_spheres(obj->o1);
+    compute_bounding_spheres(obj->o2);
+    union_bs(obj->o1, obj->o2, obj);
+    break;
+  case Intersection:
+    compute_bounding_spheres(obj->o1);
+    compute_bounding_spheres(obj->o2);
+    intersection_bs(obj->o1, obj->o2, obj);
+    break;
+  case Difference:
+    compute_bounding_spheres(obj->o1);
+    compute_bounding_spheres(obj->o2);
+    difference_bs(obj->o1, obj->o2, obj);
+    break;
+  }
+}
+
-- 
cgit