first commit

cubes.c

@@ -0,0 +1,39 @@
+#include "const.h"
+
+// placeholder function
+int cubeExists(int x, int y, int z) {
+  return ((x % 3) == (y % 4) && (y % 5) == (z % 6));
+}
+
+void gen_face(Vertex *cube, int i, int x, int y, int z, int j) {
+  Vertex a = {{x,y,z}};
+  Vertex b = a;
+  b.pos[(i==0)?1:0]++;
+  Vertex c = a;
+  c.pos[(i==2)?1:2]++;
+  Vertex d = c;
+  d.pos[(i==0)?1:0]++;
+  cube[j] = a;
+  cube[j+1] = b;
+  cube[j+2] = c;
+  cube[j+3] = c;
+  cube[j+4] = b;
+  cube[j+5] = d;
+}
+
+void gen_cubes(Vertex *cube, int x, int y, int z) {
+  int i = 0;
+  for (int y2 = y; y2 < y + CHUNK_LENGTH; y2++) {
+    int y3 = y2;
+    for (int x2 = x; x2 < x + CHUNK_LENGTH; x2++) {
+      int x3 = x2;
+      for (int z2 = z; z2 < z + CHUNK_LENGTH; z2++) {
+        int z3 = z2;
+        gen_face(cube, 0, x3, y3, z3, i);
+        gen_face(cube, 1, x3, y3, z3, i + 6);
+        gen_face(cube, 2, x3, y3, z3, i + 12);
+        i += 18;
+      }
+    }
+  }
+}