From 8b55203d41b73922ffdaaf97d2ff787c627c2b57 Mon Sep 17 00:00:00 2001
From: Aaron Griffith <aargri@gmail.com>
Date: Sun, 4 Dec 2011 10:21:48 -0500
Subject: [PATCH] initial version of 'nether' option for normal render modes

based on eminence's gist https://gist.github.com/92b6dac4c2ed3cdcff10
---
 overviewer_core/src/rendermode-normal.c | 25 +++++++++++++++++++++++++
 overviewer_core/src/rendermodes.h       |  1 +
 2 files changed, 26 insertions(+)

diff --git a/overviewer_core/src/rendermode-normal.c b/overviewer_core/src/rendermode-normal.c
index 24bf665..dfa660f 100644
--- a/overviewer_core/src/rendermode-normal.c
+++ b/overviewer_core/src/rendermode-normal.c
@@ -40,6 +40,10 @@ rendermode_normal_start(void *data, RenderState *state, PyObject *options) {
     if (!render_mode_parse_option(options, "height_fading", "i", &(self->height_fading)))
         return 1;
     
+    self->nether = 0;
+    if (!render_mode_parse_option(options, "nether", "i", &(self->nether)))
+        return 1;
+    
     if (self->height_fading) {
         self->black_color = PyObject_GetAttrString(state->chunk, "black_color");
         self->white_color = PyObject_GetAttrString(state->chunk, "white_color");
@@ -138,6 +142,26 @@ rendermode_normal_hidden(void *data, RenderState *state, int x, int y, int z) {
     if (z > self->max_depth || z < self->min_depth) {
         return 1;
     }
+    
+    if (self->nether)
+    {
+        
+        /* hide all blocks above all air blocks */
+        int below_air = 0;
+        
+        while (z < 128)
+        {
+            if (getArrayByte3D(state->blocks, x, y, z) == 0)
+            {
+                below_air = 1;
+                break;
+            }
+            z++;
+        }
+        
+        if (!below_air)
+            return 1;
+    }
 
     return 0;
 }
@@ -354,6 +378,7 @@ const RenderModeOption rendermode_normal_options[] = {
     {"min_depth", "lowest level of blocks to render (default: 0)"},
     {"max_depth", "highest level of blocks to render (default: 127)"},
     {"height_fading", "darken or lighten blocks based on height (default: False)"},
+    {"nether", "if True, remove the roof of the map. Useful on nether maps. (default: False)"},
     {NULL, NULL}
 };
 
diff --git a/overviewer_core/src/rendermodes.h b/overviewer_core/src/rendermodes.h
index e253885..1d94df9 100644
--- a/overviewer_core/src/rendermodes.h
+++ b/overviewer_core/src/rendermodes.h
@@ -136,6 +136,7 @@ typedef struct {
     unsigned int min_depth;
     unsigned int max_depth;
     int height_fading;
+    int nether;
 } RenderModeNormal;
 extern RenderModeInterface rendermode_normal;