Re-added non-indexed mesh support

core/src/mindustry/graphics/g3d/MeshBuilder.java

@@ -91,9 +91,9 @@ public class MeshBuilder{
 
         boolean emit = mesher.isEmissive();
 
-        if(grid.tiles.length * 6 >= 65535) throw new RuntimeException("Due to index size limits, only meshes with a maximum of 65535 vertices are supported. If you want more than that, make your own non-indexed mesh builder.");
+        boolean indexed = grid.tiles.length * 6 < 65535;
 
-        Mesh mesh = begin(grid.tiles.length * 6, grid.tiles.length * 4 * 3, true, emit);
+        Mesh mesh = begin(indexed ? grid.tiles.length * 6 : grid.tiles.length * 12, indexed ? grid.tiles.length * 4 * 3 : 0, true, emit);
 
         float[] heights;
 
@@ -109,7 +109,7 @@ public class MeshBuilder{
         }
         int position = 0;
 
-        short[] shorts = new short[12];
+        short[] shorts = indexed ? new short[12] : null;
         float[] floats = new float[3 + (gl30 ? 1 : 3) + 1 + (emit ? 1 : 0)];
         Vec3 nor = new Vec3();
 
@@ -150,6 +150,7 @@ public class MeshBuilder{
                 emissive = tmpCol.toFloatBits();
             }
 
+            if(indexed){
                 for(var corner : c){
                     float height = heights[corner.id];
 
@@ -175,7 +176,17 @@ public class MeshBuilder{
                 }
 
                 mesh.getIndicesBuffer().put(shorts, 0, c.length > 5 ? 12 : 9);
+
                 position += c.length;
+            }else{
+                verts(mesh, floats, c[0].v, heights[c[0].id], c[1].v, heights[c[1].id], c[2].v, heights[c[2].id], nor, color, emissive);
+                verts(mesh, floats, c[0].v, heights[c[0].id], c[2].v, heights[c[2].id], c[3].v, heights[c[3].id], nor, color, emissive);
+                verts(mesh, floats, c[0].v, heights[c[0].id], c[3].v, heights[c[3].id], c[4].v, heights[c[4].id], nor, color, emissive);
+
+                if(c.length > 5){
+                    verts(mesh, floats, c[0].v, heights[c[0].id], c[4].v, heights[c[4].id], c[5].v, heights[c[5].id], nor, color, emissive);
+                }
+            }
         }
 
         return end(mesh);
@@ -240,6 +251,12 @@ public class MeshBuilder{
         out.set(cx, cy, cz).nor();
     }
 
+    private static void verts(Mesh mesh, float[] floats, Vec3 a, float h1, Vec3 b, float h2, Vec3 c, float h3, Vec3 normal, float color, float emissive){
+        vert(mesh, floats, a.x * h1, a.y * h1, a.z * h1, normal, color, emissive);
+        vert(mesh, floats, b.x * h2, b.y * h2, b.z * h2, normal, color, emissive);
+        vert(mesh, floats, c.x * h3, c.y * h3, c.z * h3, normal, color, emissive);
+    }
+
     private static void vert(Mesh mesh, float[] floats, float x, float y, float z, Vec3 normal, float color, float emissive){
         floats[0] = x;
         floats[1] = y;