Patch from Jean-René Reinhard: support for feDiffuseLighting and

feSpecularLighting filter primitives

(bzr r3269)

1 files changed, 111 insertions, 0 deletions

diff --git a/src/display/nr-3dutils.h b/src/display/nr-3dutils.h
new file mode 100644
index 000000000..4baa9cc86
--- /dev/null
+++ b/src/display/nr-3dutils.h
@@ -0,0 +1,111 @@
+#ifndef __NR_3DUTILS_H__
+#define __NR_3DUTILS_H__
+
+/*
+ * 3D utils. Definition of gdouble vectors of dimension 3 and of some basic
+ * functions.
+ *
+ * Authors:
+ *   Jean-Rene Reinhard <jr@komite.net>
+ *
+ * Copyright (C) 2007 authors
+ *
+ * Released under GNU GPL, read the file 'COPYING' for more information
+ */
+
+#include <gdk/gdktypes.h>
+
+struct NRPixBlock;
+
+namespace NR {
+
+struct Matrix;
+
+#define X_3D 0
+#define Y_3D 1
+#define Z_3D 2
+
+/**
+ * a type of 3 gdouble components vectors
+ */
+typedef gdouble Fvector[3];
+
+/**
+ * The eye vector
+ */
+const static Fvector EYE_VECTOR = {0, 0, 1};
+
+/**
+ * returns the euclidian norm of the vector v
+ *
+ * \param v a reference to a vector with double components
+ * \return the euclidian norm of v
+ */
+gdouble norm(const Fvector &v);
+
+/**
+ * Normalizes a vector
+ *
+ * \param v a reference to a vector to normalize
+ */
+void normalize_vector(Fvector &v);
+
+/**
+ * Computes the scalar product between two Fvectors
+ *
+ * \param a a Fvector reference
+ * \param b a Fvector reference
+ * \return the scalar product of a and b
+ */
+gdouble scalar_product(const Fvector &a, const Fvector &b);
+
+/**
+ * Computes the normalized sum of two Fvectors
+ *
+ * \param r a Fvector reference where we store the result
+ * \param a a Fvector reference
+ * \param b a Fvector reference
+ */
+void normalized_sum(Fvector &r, const Fvector &a, const Fvector &b);
+
+/**
+ * Computes the unit suface normal vector of surface given by "in" at (i, j)
+ * and store it into N. "in" is a (NRPixBlock *) in mode RGBA but only the alpha
+ * channel is considered as a bump map. ss is the altitude when for the alpha
+ * value 255. dx and dy are the deltas used to compute in our discrete setting
+ *
+ * \param N a reference to a Fvector in which we store the unit surface normal
+ * \param ss the surface scale
+ * \param in a NRPixBlock * whose alpha channel codes the surface
+ * \param i the x coordinate of the point at which we compute the normal
+ * \param j the y coordinate of the point at which we compute the normal
+ * \param dx the delta used in the x coordinate
+ * \param dy the delta used in the y coordinate
+ */
+void compute_surface_normal(Fvector &N, gdouble ss, NRPixBlock *in, int i, int j, int dx, int dy);
+
+/**
+ * Applies the transformation matrix to (x, y, z). This function assumes that
+ * trans[0] = trans[3]. x and y are transformed according to trans, z is
+ * multiplied by trans[0].
+ *
+ * \param x a reference to a x coordinate
+ * \param y a reference to a y coordinate
+ * \param z a reference to a z coordinate
+ * \param z a reference to a transformation matrix
+ */
+void convert_coord(gdouble &x, gdouble &y, gdouble &z, Matrix const &trans);
+
+} /* namespace NR */
+
+#endif /* __NR_3DUTILS_H__ */
+/*
+  Local Variables:
+  mode:c++
+  c-file-style:"stroustrup"
+  c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +))
+  indent-tabs-mode:nil
+  fill-column:99
+  End:
+*/
+// vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:encoding=utf-8:textwidth=99 :