evas: surface primitive is normalized in Evas_3D examples.

Reviewers: cedric, Hermet, raster

Subscribers: cedric

Differential Revision: https://phab.enlightenment.org/D2341

Signed-off-by: Cedric BAIL <cedric@osg.samsung.com>

diff --git a/src/examples/evas/evas-3d-primitives.c b/src/examples/evas/evas-3d-primitives.c
index d2297faae53e3db9f76fec97eb46c35b6df69da1..41b3fde15b7710a8c6992cab0e654b5b66d74f50 100644 (file)
--- a/src/examples/evas/evas-3d-primitives.c
+++ b/src/examples/evas/evas-3d-primitives.c
@@ -382,6 +382,38 @@ evas_3d_add_sphere_frame(Eo *mesh, int frame, int p, vec2 tex_scale)
    SET_VERTEX_DATA(frame)
 }
 
+void
+_normalize(vec3 *vertices, vec3 *normals, int vcount)
+{
+   int i;
+   vec3 min, max;
+   min = max = vertices[0];
+
+#define CHECK_MIN_AND_MAX(coord)                \
+        if (min.coord > vertices[i].coord)      \
+          min.coord = vertices[i].coord;        \
+        else if (max.coord < vertices[i].coord) \
+          max.coord = vertices[i].coord;
+   for (i = 1; i < vcount; i++)
+     {
+        CHECK_MIN_AND_MAX(x)
+        CHECK_MIN_AND_MAX(y)
+        CHECK_MIN_AND_MAX(z)
+     }
+#undef CHECK_MIN_AND_MAX
+
+   for (i = 0; i < vcount; i++)
+     {
+        vertices[i].x = (vertices[i].x - min.x) / (max.x - min.x) - 0.5;
+        vertices[i].y = (vertices[i].y - min.y) / (max.y - min.y) - 0.5;
+        vertices[i].z = (vertices[i].z - min.z) / (max.z - min.z) - 0.5;
+
+        normals[i].x = normals[i].x / (max.x - min.x);
+        normals[i].y = normals[i].y / (max.y - min.y);
+        normals[i].z = normals[i].z / (max.z - min.z);
+     }
+}
+
 void
 evas_3d_add_func_surface_frame(Eo *mesh, int frame, Surface func, int p, vec2 tex_scale)
 {
@@ -413,6 +445,7 @@ evas_3d_add_func_surface_frame(Eo *mesh, int frame, Surface func, int p, vec2 te
           }
      }
 
+   _normalize(vertices, normals, vcount);
    _generate_grid_indices(indices, p);
    SET_VERTEX_DATA(frame)
 }