Patch from Jean-René Reinhard: support for feDiffuseLighting and

feSpecularLighting filter primitives

(bzr r3269)

1 files changed, 119 insertions, 0 deletions

diff --git a/src/display/nr-light.cpp b/src/display/nr-light.cpp
new file mode 100644
index 000000000..c2e6f1f83
--- /dev/null
+++ b/src/display/nr-light.cpp
@@ -0,0 +1,119 @@
+#define __NR_LIGHT_CPP__
+
+/*
+ * Light rendering helpers
+ *
+ * Author:
+ *   Jean-Rene Reinhard <jr@komite.net>
+ *
+ * Copyright (C) 2006 Jean-Rene Reinhard
+ *
+ * Released under GNU GPL, read the file 'COPYING' for more information
+ */
+
+#include <cmath>
+
+#include "libnr/nr-pixops.h"
+#include "display/nr-light.h"
+#include "display/nr-3dutils.h"
+#include "sp-fedistantlight.h"
+#include "sp-fepointlight.h"
+#include "sp-fespotlight.h"
+
+namespace NR {
+   
+DistantLight::DistantLight(SPFeDistantLight *light, guint32 lighting_color) {
+    color = lighting_color;
+    azimuth = M_PI / 180 * light->azimuth;
+    elevation = M_PI / 180 * light->elevation;
+}
+
+DistantLight::~DistantLight() {}
+
+void DistantLight::light_vector(Fvector &v) {
+    v[X_3D] = std::cos(azimuth)*std::cos(elevation);
+    v[Y_3D] = std::sin(azimuth)*std::cos(elevation);
+    v[Z_3D] = std::sin(elevation);
+} 
+
+void DistantLight::light_components(Fvector &lc) {
+    lc[LIGHT_RED] = NR_RGBA32_R(color);
+    lc[LIGHT_GREEN] = NR_RGBA32_G(color);
+    lc[LIGHT_BLUE] = NR_RGBA32_B(color);
+}
+
+PointLight::PointLight(SPFePointLight *light, guint32 lighting_color, const Matrix &trans) {
+    color = lighting_color;
+    l_x = light->x;
+    l_y = light->y;
+    l_z = light->z;
+    convert_coord(l_x, l_y, l_z, trans);
+}
+
+PointLight::~PointLight() {}
+
+void PointLight::light_vector(Fvector &v, gdouble x, gdouble y, gdouble z) {
+    v[X_3D] = l_x - x;
+    v[Y_3D] = l_y - y;
+    v[Z_3D] = l_z - z;
+    normalize_vector(v);
+} 
+
+void PointLight::light_components(Fvector &lc) {
+    lc[LIGHT_RED] = NR_RGBA32_R(color);
+    lc[LIGHT_GREEN] = NR_RGBA32_G(color);
+    lc[LIGHT_BLUE] = NR_RGBA32_B(color);
+}
+
+SpotLight::SpotLight(SPFeSpotLight *light, guint32 lighting_color, const Matrix &trans) {
+    gdouble p_x, p_y, p_z;
+    color = lighting_color;
+    l_x = light->x;
+    l_y = light->y;
+    l_z = light->z;
+    p_x = light->pointsAtX;
+    p_y = light->pointsAtY;
+    p_z = light->pointsAtZ;
+    cos_lca = std::cos(M_PI / 180 * light->limitingConeAngle);
+    speExp = light->specularExponent;
+    convert_coord(l_x, l_y, l_z, trans);
+    convert_coord(p_x, p_y, p_z, trans);
+    S[X_3D] = p_x - l_x;
+    S[Y_3D] = p_y - l_y;
+    S[Z_3D] = p_z - l_z;
+    normalize_vector(S);
+    
+}
+
+SpotLight::~SpotLight() {}
+
+void SpotLight::light_vector(Fvector &v, gdouble x, gdouble y, gdouble z) {
+    v[X_3D] = l_x - x;
+    v[Y_3D] = l_y - y;
+    v[Z_3D] = l_z - z;
+    normalize_vector(v);
+} 
+
+void SpotLight::light_components(Fvector &lc, const Fvector &L) {
+    gdouble spmod = (-1) * scalar_product(L, S);
+    if (spmod <= cos_lca)
+        spmod = 0;
+    else
+        spmod = std::pow(spmod, speExp);
+    lc[LIGHT_RED] = spmod * NR_RGBA32_R(color);
+    lc[LIGHT_GREEN] = spmod * NR_RGBA32_G(color);
+    lc[LIGHT_BLUE] = spmod * NR_RGBA32_B(color);
+}
+
+} /* namespace NR */
+
+/*
+  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 :