replace defines where possible

src/constants.h

@@ -4,27 +4,27 @@
 #include <limits.h>
 #include "typedefs.h"
 
-#define ENGINE_VERSION_MAJOR 0
-#define ENGINE_VERSION_MINOR 15
-#define STR_(x) #x
-#define STR(x) STR_(x)
-#define ENGINE_VERSION STR(ENGINE_VERSION_MAJOR) "." STR(ENGINE_VERSION_MINOR)
+const int ENGINE_VERSION_MAJOR = 0;
+const int ENGINE_VERSION_MINOR = 15;
+#define TOSTR_MACRO(x) #x
+#define ENGINE_VERSION TOSTR_MACRO(ENGINE_VERSION_MAJOR) "." TOSTR_MACRO(ENGINE_VERSION_MINOR);
 
-#define CHUNK_W 16
-#define CHUNK_H 256
-#define CHUNK_D 16
+const int CHUNK_W = 16;
+const int CHUNK_H = 256;
+const int CHUNK_D = 16;
 
 /* Chunk volume (count of voxels per Chunk) */
-#define CHUNK_VOL (CHUNK_W * CHUNK_H * CHUNK_D)
+const int CHUNK_VOL = (CHUNK_W * CHUNK_H * CHUNK_D);
 
 /* BLOCK_VOID is block id used to mark non-existing voxel (voxel of missing chunk) */
-#define BLOCK_VOID (blockid_t)((2 << (sizeof(blockid_t)*CHAR_BIT)) - 1)
+const blockid_t BLOCK_VOID = UCHAR_MAX;
 
 inline uint vox_index(int x, int y, int z, int w=CHUNK_W, int d=CHUNK_D) {
 	return (y * d + z) * w + x;
 }
 
-#define SHADERS_FOLDER "shaders"
+//cannot replace defines with const while used for substitution
+#define SHADERS_FOLDER "shaders" 
 #define TEXTURES_FOLDER "textures"
 #define FONTS_FOLDER "fonts"