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/render.c | 128 ++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 128 insertions(+)
 create mode 100644 test/raytracer/render.c

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

diff --git a/test/raytracer/render.c b/test/raytracer/render.c
new file mode 100644
index 00000000..3678cb6f
--- /dev/null
+++ b/test/raytracer/render.c
@@ -0,0 +1,128 @@
+#include "config.h"
+#include "point.h"
+#include "vector.h"
+#include "matrix.h"
+#include "eval.h"
+#include "object.h"
+#include "light.h"
+#include "intersect.h"
+#include "surface.h"
+#include "simplify.h"
+#include "render.h"
+
+static void render_ray(struct point * amb,
+                       int depth,
+                       int initial,
+                       struct object * obj,
+                       struct light ** lights,
+                       struct point * p,
+                       struct vector * v,
+                       flt multx,
+                       flt multy,
+                       flt multz,
+                       /*out*/ struct point * color)
+{
+  struct object * bobj;
+  flt t;
+  struct point inter_w, inter_o;
+  int face;
+  flt surf_u, surf_v;
+  struct surface_characteristics sc;
+  flt dotprod;
+  struct vector n, n2, s;
+  struct point il, is;
+
+  if (depth < 0) {
+    color->x = color->y = color->z = 0.0;
+    return;
+  }
+  bobj = intersect_ray(p, v, obj, initial, &t);
+  if (bobj == NULL || t == 0.0) {
+    color->x = color->y = color->z = 0.0;
+    return;
+  }
+  /* Compute surface characteristics */
+  point_along(p, v, t, &inter_w);
+  apply_to_point(bobj->world2obj, &inter_w, &inter_o);
+  surface_coords(bobj, &inter_o, &face, &surf_u, &surf_v);
+  surface_function(&bobj->surf, face, surf_u, surf_v, &sc);
+  /* Construct the vectors on figure 4 */
+  normal_vector(bobj, &inter_w, face, &n);
+  dotprod = dotproduct(v, &n);
+  vscale(&n, 2.0 * dotprod, &n2);
+  vsub(v, &n2, &s);
+  if (dotprod > 0.0) opposite(&n, &n);
+  /* Light sources */
+  color_from_lights(obj, &inter_w, v, &n,
+                    sc.kd, sc.ks, sc.phong,
+                    lights, &il);
+  /* Recursive call for ray along s */
+  multx = multx * sc.ks * sc.x;
+  multy = multy * sc.ks * sc.y;
+  multz = multz * sc.ks * sc.z;
+  if (multx < 0.1 && multy < 0.1 && multz < 0.1)
+    is.x = is.y = is.z = 0.0;
+  else
+    render_ray(amb, depth - 1, 0, obj, lights, &inter_w, &s,
+               multx, multy, multz, &is);
+  /* Compute final color */
+  color->x = (sc.kd * amb->x + il.x + sc.ks * is.x) * sc.x;
+  color->y = (sc.kd * amb->y + il.y + sc.ks * is.y) * sc.y;
+  color->z = (sc.kd * amb->z + il.z + sc.ks * is.z) * sc.z;
+}
+
+static int convert_color(flt c)
+{
+  int n = (int) (c * 255.0);
+  if (n < 0) n = 0;
+  if (n > 255) n = 255;
+  return n;
+}
+
+void render(struct point * amb,
+            int numlights,
+            struct light ** lights,
+            struct object * scene,
+            int depth,
+            flt fov,
+            int wid,
+            int ht,
+            char * filename)
+{
+  FILE * oc;
+  flt wid2, ht2, scale, x, y;
+  int i, j;
+  struct point p;
+  struct vector v;
+  struct point color;
+  char * command;
+
+  compute_bounding_spheres(scene);
+  wid2 = (flt) wid / 2.0;
+  ht2 = (flt) ht / 2.0;
+  scale = tan(fov / 2.0) / wid2;
+  oc = fopen(filename, "w");
+  fprintf(oc, "P6\n# Camls 'R Us\n%d %d\n255\n", wid, ht);
+  arena_init();
+  for (j = ht - 1; j >= 0; j--) {
+    y = ((flt) j - ht2 + 0.5) * scale;
+    for (i = 0; i < wid; i++) {
+      x = ((flt) i - wid2 + 0.5) * scale;
+      p.x = p.y = 0.0; p.z = -1.0;
+      v.dx = x; v.dy = y; v.dz = 1.0;
+      render_ray(amb, depth, 1, scene, lights, &p, &v, 255.0, 255.0, 255.0,
+                 &color);
+      fputc(convert_color(color.x), oc);
+      fputc(convert_color(color.y), oc);
+      fputc(convert_color(color.z), oc);
+      arena_clear();
+    }
+  }
+  fclose(oc);
+#ifdef XV
+  command = malloc(strlen(filename) + 20);
+  sprintf(command, "xv %s &", filename);
+  system(command);
+  free(command);
+#endif
+}
-- 
cgit