Merge branch 'master' into rendermode-options

overviewer_core/src/rendermode-night.c

@@ -0,0 +1,71 @@
+/* 
+ * 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"
+#include <math.h>
+
+/* figures out the black_coeff from a given skylight and blocklight, used in
+   lighting calculations -- note this is *different* from the one in
+   rendermode-lighting.c (the "skylight - 11" part) */
+static float calculate_darkness(unsigned char skylight, unsigned char blocklight) {
+    return 1.0f - powf(0.8f, 15.0 - MAX(blocklight, skylight - 11));
+}
+
+static int
+rendermode_night_start(void *data, RenderState *state, PyObject *options) {
+    RenderModeNight* self;    
+
+    /* first, chain up */
+    int ret = rendermode_lighting.start(data, state, options);
+    if (ret != 0)
+        return ret;
+    
+    /* override the darkness function with our night version! */
+    self = (RenderModeNight *)data;    
+    self->parent.calculate_darkness = calculate_darkness;
+    
+    return 0;
+}
+
+static void
+rendermode_night_finish(void *data, RenderState *state) {
+    /* nothing special to do */
+    rendermode_lighting.finish(data, state);
+}
+
+static int
+rendermode_night_occluded(void *data, RenderState *state, int x, int y, int z) {
+    /* no special occlusion here */
+    return rendermode_lighting.occluded(data, state, x, y, z);
+}
+
+static void
+rendermode_night_draw(void *data, RenderState *state, PyObject *src, PyObject *mask, PyObject *mask_light) {
+    /* nothing special to do */
+    rendermode_lighting.draw(data, state, src, mask, mask_light);
+}
+
+RenderModeInterface rendermode_night = {
+    "night", "like \"lighting\", except at night",
+    NULL,
+    &rendermode_lighting,
+    sizeof(RenderModeNight),
+    rendermode_night_start,
+    rendermode_night_finish,
+    rendermode_night_occluded,
+    rendermode_night_draw,
+};