New geometry data structures.

src/gen.c

@@ -1,5 +1,4 @@
 #include "include/gen.h"
-#include "include/col.h"
 
 #include <stdlib.h>
 #include <time.h>
@@ -107,25 +106,17 @@ Pt world_edge_idx_to_pt(int idx) {
 void gen_lith() {
     srand(time(NULL));
 
-    Pt p1 = {(rand() % 6) + 1, 0};
-    Pt p2 = {(rand() % 6) + 1, 7};
-
-    lith[0] = (Plate){
-        .col = COL_RED,
-        .nverts = 4,
-        .verts = {
-            (Pt){0, 0},
-            p1,
-            p2,
-            (Pt){0, 7},
-        },
+    Tri tri1 = {
+        (Pt){0, 0},
+        (Pt){0, 7},
+        (Pt){7, 0},
     };
-    lith[1] = (Plate){.col = COL_RED,
-                      .nverts = 4,
-                      .verts = {
-                          p1,
-                          (Pt){7, 0},
-                          (Pt){7, 7},
-                          p2,
-                      }};
+    Tri tri2 = {
+        (Pt){7, 0},
+        (Pt){0, 7},
+        (Pt){7, 7},
+    };
+
+    lith[0] = (Plate){.tris = {tri1}};
+    lith[1] = (Plate){.tris = {tri2}};
 }