Terrain Generation

package generation;

public class GridGenerator {

    public static int[] generateGridIndexBuffer(int vertexCount, boolean evenTile) {
        int testBit = (vertexCount%2==0) && !evenTile ? 1 : 0;
        int indexCount = (vertexCount - 1) * (vertexCount - 1) * 6;
        int[] indices = new int[indexCount];
        int pointer = 0;
        for (int col = 0; col < vertexCount - 1; col++) {
            for (int row = 0; row < vertexCount - 1; row++) {
                int topLeft = (row * vertexCount) + col;
                int topRight = topLeft + 1;
                int bottomLeft = ((row + 1) * vertexCount) + col;
                int bottomRight = bottomLeft + 1;
                if (row % 2 == 0) {
                    pointer = storeQuad1(indices, pointer, topLeft, topRight, bottomLeft, bottomRight, col % 2 == testBit);
                } else {
                    pointer = storeQuad2(indices, pointer, topLeft, topRight, bottomLeft, bottomRight, col % 2 == testBit);
                }
            }
        }
        return indices;
    }

    private static int storeQuad1(int[] indices, int pointer, int topLeft, int topRight, int bottomLeft,
            int bottomRight, boolean mixed) {
        indices[pointer++] = topLeft;
        indices[pointer++] = bottomLeft;
        indices[pointer++] = mixed ? topRight : bottomRight;
        indices[pointer++] = bottomRight;
        indices[pointer++] = topRight;
        indices[pointer++] = mixed ? bottomLeft : topLeft;
        return pointer;
    }

    private static int storeQuad2(int[] indices, int pointer, int topLeft, int topRight, int bottomLeft,
            int bottomRight, boolean mixed) {
        indices[pointer++] = topRight;
        indices[pointer++] = topLeft;
        indices[pointer++] = mixed ? bottomRight : bottomLeft;
        indices[pointer++] = bottomLeft;
        indices[pointer++] = bottomRight;
        indices[pointer++] = mixed ? topLeft : topRight;
        return pointer;
    }

}