[Bf-blender-cvs] SVN commit: /data/svn/bf-blender [50315] trunk/blender/intern/cycles/kernel /osl/nodes: Cycles / OSL:

[Thomas Dinges]

Revision: 50315
          http://projects.blender.org/scm/viewvc.php?view=rev&root=bf-blender&revision=50315
Author:   dingto
Date:     2012-09-02 13:34:12 +0000 (Sun, 02 Sep 2012)
Log Message:
-----------
Cycles / OSL:
* Add oslutil.h, from osl 1.2. 

Modified Paths:
--------------
    trunk/blender/intern/cycles/kernel/osl/nodes/CMakeLists.txt

Added Paths:
-----------
    trunk/blender/intern/cycles/kernel/osl/nodes/oslutil.h

Modified: trunk/blender/intern/cycles/kernel/osl/nodes/CMakeLists.txt
===================================================================
--- trunk/blender/intern/cycles/kernel/osl/nodes/CMakeLists.txt	2012-09-02 13:23:44 UTC (rev 50314)
+++ trunk/blender/intern/cycles/kernel/osl/nodes/CMakeLists.txt	2012-09-02 13:34:12 UTC (rev 50315)
@@ -56,6 +56,7 @@
 	node_color.h
 	node_fresnel.h
 	stdosl.h
+	oslutil.h
 )
 
 set(SRC_OSO

Added: trunk/blender/intern/cycles/kernel/osl/nodes/oslutil.h
===================================================================
--- trunk/blender/intern/cycles/kernel/osl/nodes/oslutil.h	                        (rev 0)
+++ trunk/blender/intern/cycles/kernel/osl/nodes/oslutil.h	2012-09-02 13:34:12 UTC (rev 50315)
@@ -0,0 +1,91 @@
+/////////////////////////////////////////////////////////////////////////////
+// Copyright (c) 2009-2010 Sony Pictures Imageworks Inc., et al.  All Rights Reserved.
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+// * Redistributions of source code must retain the above copyright
+//   notice, this list of conditions and the following disclaimer.
+// * Redistributions in binary form must reproduce the above copyright
+//   notice, this list of conditions and the following disclaimer in the
+//   documentation and/or other materials provided with the distribution.
+// * Neither the name of Sony Pictures Imageworks nor the names of its
+//   contributors may be used to endorse or promote products derived from
+//   this software without specific prior written permission.
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+/////////////////////////////////////////////////////////////////////////////
+
+
+#ifndef CCL_OSLUTIL_H
+#define CCL_OSLUTIL_H
+
+// Return wireframe opacity factor [0, 1] given a geometry type in
+// ("triangles", "polygons" or "patches"), and a line_width in raster
+// or world space depending on the last (raster) boolean argument.
+//
+float wireframe(string edge_type, float line_width, int raster)
+{
+   // ray differentials are so big in diffuse context that this function would always return "wire"
+   if (raytype("path:diffuse")) return 0.0;
+
+   int np = 0;
+   point p[64];
+   float pixelWidth = 1;
+
+   if (edge_type == "triangles")
+   {
+      np = 3;
+      if (!getattribute("geom:trianglevertices", p))
+         return 0.0;
+   }
+   else if (edge_type == "polygons" || edge_type == "patches")
+   {
+      getattribute("geom:numpolyvertices", np);
+      if (np < 3 || !getattribute("geom:polyvertices", p))
+         return 0.0;
+   }
+
+   if (raster)
+   {
+      // Project the derivatives of P to the viewing plane defined
+      // by I so we have a measure of how big is a pixel at this point
+      float pixelWidthX = length(Dx(P) - dot(Dx(P), I) * I);
+      float pixelWidthY = length(Dy(P) - dot(Dy(P), I) * I);
+      // Take the average of both axis' length
+      pixelWidth = (pixelWidthX + pixelWidthY) / 2;
+   }
+
+   // Use half the width as the neighbor face will render the
+   // other half. And take the square for fast comparison
+   pixelWidth *= 0.5 * line_width;
+   pixelWidth *= pixelWidth;
+   for (int i = 0; i < np; i++)
+   {
+      int i2 = i ? i - 1 : np - 1;
+      vector dir = P - p[i];
+      vector edge = p[i] - p[i2];
+      vector crs = cross(edge, dir);
+      // At this point dot(crs, crs) / dot(edge, edge) is
+      // the square of area / length(edge) == square of the
+      // distance to the edge.
+      if (dot(crs, crs) < (dot(edge, edge) * pixelWidth))
+         return 1;
+   }
+   return 0;
+}
+
+float wireframe(string edge_type, float line_width) { return wireframe(edge_type, line_width, 1); }
+float wireframe(string edge_type) { return wireframe(edge_type, 1.0, 1); }
+float wireframe() { return wireframe("polygons", 1.0, 1); }
+
+#endif /* CCL_OSLUTIL_H */