converted smooth-lighting into a primitive

for the first time ever, smooth-lit cave mode is now possible \o/

overviewer_core/src/primitives/lighting.h

@@ -0,0 +1,53 @@
+/* 
+ * This file is part of the Minecraft Overviewer.
+ *
+ * Minecraft Overviewer is free software: you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as published
+ * by the Free Software Foundation, either version 3 of the License, or (at
+ * your option) any later version.
+ *
+ * Minecraft Overviewer is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General
+ * Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with the Overviewer.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include "../overviewer.h"
+
+typedef struct {
+    PyObject *facemasks_py;
+    PyObject *facemasks[3];
+    
+    /* extra data, loaded off the chunk class */
+    PyObject *skylight, *blocklight;
+    PyObject *left_skylight, *left_blocklight;
+    PyObject *right_skylight, *right_blocklight;
+    PyObject *up_left_skylight, *up_left_blocklight;
+    PyObject *up_right_skylight, *up_right_blocklight;
+    
+    /* light color image, loaded if color_light is True */
+    PyObject *lightcolor;
+    
+    /* can be overridden in derived rendermodes to control lighting
+       arguments are data, skylight, blocklight, return RGB */
+    void (*calculate_light_color)(void *, unsigned char, unsigned char, unsigned char *, unsigned char *, unsigned char *);
+    
+    /* can be set to 0 in derived modes to indicate that lighting the chunk
+     * sides is actually important. Right now, this is used in cave mode
+     */
+    int skip_sides;
+    
+    float strength;
+    int color;
+    int night;
+} RenderPrimitiveLighting;
+
+/* exposed so that smooth-lighting can use them */
+extern RenderPrimitiveInterface primitive_lighting;
+int lighting_is_face_occluded(RenderState *state, int skip_sides, int x, int y, int z);
+void get_lighting_color(RenderPrimitiveLighting *self, RenderState *state,
+                        int x, int y, int z,
+                        unsigned char *r, unsigned char *g, unsigned char *b);