initial stb_voxel_render version with working minecraft viewer

tests/caveview/cave_parse.h

@@ -0,0 +1,41 @@
+#ifndef INCLUDE_CAVE_PARSE_H
+#define INCLUDE_CAVE_PARSE_H
+
+typedef struct
+{
+   unsigned char block;
+   unsigned char data;
+   unsigned char light:4;
+   unsigned char skylight:4;
+} raw_block;
+
+// this is the old fully-decoded chunk
+typedef struct
+{
+   int xpos, zpos, max_y;
+   int height[16][16];
+   raw_block rb[16][16][256]; // [z][x][y] which becomes [y][x][z] in stb
+} chunk;
+
+chunk *get_decoded_chunk(int chunk_x, int chunk_z);
+
+#define NUM_SEGMENTS  16
+typedef struct
+{
+   int max_y, xpos, zpos;
+
+   unsigned char *blockdata[NUM_SEGMENTS];
+   unsigned char *data[NUM_SEGMENTS];
+   unsigned char *skylight[NUM_SEGMENTS];
+   unsigned char *light[NUM_SEGMENTS];
+   
+   void *pointer_to_free;   
+
+   int refcount; // this allows multi-threaded building without wrapping in ANOTHER struct
+} fast_chunk;
+
+fast_chunk *get_decoded_fastchunk(int chunk_x, int chunk_z); // cache, never call free()
+
+fast_chunk *get_decoded_fastchunk_uncached(int chunk_x, int chunk_z);
+
+#endif