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/light.c | 126 +++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 126 insertions(+)
 create mode 100644 test/raytracer/light.c

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

diff --git a/test/raytracer/light.c b/test/raytracer/light.c
new file mode 100644
index 00000000..1c90104c
--- /dev/null
+++ b/test/raytracer/light.c
@@ -0,0 +1,126 @@
+#include "config.h"
+#include "point.h"
+#include "vector.h"
+#include "eval.h"
+#include "object.h"
+#include "intersect.h"
+#include "light.h"
+
+struct light * dirlight(struct point * dir, struct point * c)
+{
+  struct light * l = arena_alloc(sizeof(struct light));
+  l->kind = Directional;
+  ASSIGN(l->u.directional.dir, *dir);
+  ASSIGN(l->u.directional.col, *c);
+  return l;
+}
+
+struct light * pointlight(struct point * orig, struct point * c)
+{
+  struct light * l = arena_alloc(sizeof(struct light));
+  l->kind = Pointlight;
+  ASSIGN(l->u.point.orig, *orig);
+  ASSIGN(l->u.point.col, *c);
+  return l;
+}
+
+struct light * spotlight(struct point * pos, struct point * at,
+                         struct point * c, flt cutoff, flt exp)
+{
+  struct light * l = arena_alloc(sizeof(struct light));
+  struct vector uv;
+  l->kind = Spot;
+  ASSIGN(l->u.spot.orig, *pos);
+  ASSIGN(l->u.spot.at, *at);
+  ASSIGN(l->u.spot.col, *c);
+  l->u.spot.cutoff = cutoff;
+  l->u.spot.exponent = exp;
+  between(at, pos, &uv);
+  vnormalize(&uv, &(l->u.spot.unit));
+  return l;
+}
+
+static void color_from_light(struct object * scene,
+                             struct point * pt,
+                             struct vector * v,
+                             struct vector * n,
+                             flt kd, flt ks, flt phong,
+                             struct light * light,
+                             /*out*/ struct point * il)
+{
+  struct vector dir;
+  struct object * obj;
+  struct vector L, H, vnorm;
+  struct point i;
+  flt t, att, dp, m;
+
+  /* Compute direction towards light source */
+  switch (light->kind) {
+  case Directional:
+    dir.dx = - light->u.directional.dir.x;
+    dir.dy = - light->u.directional.dir.y;
+    dir.dz = - light->u.directional.dir.z;
+    break;
+  case Pointlight:
+    between(pt, &light->u.point.orig, &dir);
+    break;
+  case Spot:
+    between(pt, &light->u.spot.orig, &dir);
+    break;
+  }
+  /* Check that light source is not behind us */
+  if (dotproduct(&dir, n) <= 0.0) return; /*no contribution*/
+  /* Check that no object blocks the light */
+  obj = intersect_ray(pt, &dir, scene, 0 /*??*/, &t);
+  if (obj != NULL && (light->kind == Directional || t <= 1.0)) return;
+  /* Compute the L and H vectors */
+  vnormalize(&dir, &L);
+  vnormalize(v, &vnorm);
+  vsub(&L, &vnorm, &H);
+  vnormalize(&H, &H);
+  /* Intensity of light source at object */
+  switch (light->kind) {
+  case Directional:
+    i.x = light->u.directional.col.x;
+    i.y = light->u.directional.col.y;
+    i.z = light->u.directional.col.z;
+    break;
+  case Pointlight:
+    att = 100.0 / (99.0 + dist2(pt, &light->u.point.orig));
+    i.x = light->u.point.col.x * att;
+    i.y = light->u.point.col.y * att;
+    i.z = light->u.point.col.z * att;
+    break;
+  case Spot:
+    dp = dotproduct(&L, &light->u.spot.unit);
+    if (acos(dp) >= light->u.spot.cutoff) return;
+    att =
+      pow(dp, light->u.spot.exponent)
+      * (100.0 / (99.0 + dist2(pt, &light->u.spot.orig)));
+    i.x = light->u.spot.col.x * att;
+    i.y = light->u.spot.col.y * att;
+    i.z = light->u.spot.col.z * att;
+    break;
+  }
+  /* Add final contribution */
+  m = kd * dotproduct(n, &L) + ks * pow(dotproduct(n, &H), phong);
+  il->x += m * i.x;
+  il->y += m * i.y;
+  il->z += m * i.z;
+}
+
+void color_from_lights(struct object * scene,
+                       struct point * p,
+                       struct vector * v,
+                       struct vector * n,
+                       flt kd, flt ks, flt phong,
+                       struct light ** lights,
+                       /*out*/ struct point * il)
+{
+  int i;
+
+  il->x = il->y = il->z = 0.0;
+  for (i = 0; lights[i] != NULL; i++)
+    color_from_light(scene, p, v, n, kd, ks, phong, lights[i], il);
+}
+
-- 
cgit