Number of preset queens for GpuSolver can now be set

src/de/nqueensfaf/compute/GpuConstellationsGenerator.java

@@ -7,15 +7,15 @@
 
 class GpuConstellationsGenerator {
 
-	private int N, preQueens = 5, L, mask, LD, RD, counter;
+	private int N, preQueens, L, mask, LD, RD, counter;
 	private int kbit, lbit; 					
 	private HashSet<Integer> startConstellations;
 	private ArrayList<Integer> jklList, startList;
 	ArrayList<Integer> ldList, rdList, colList, startjklList, symList;
 	int startConstCount;
-
+	
 	// generate starting constellations 
-	void genConstellations(int N, int WORKGROUP_SIZE) {
+	void genConstellations(int N, int WORKGROUP_SIZE, int preQueens) {
 		// the name says it all
 		ldList = new ArrayList<Integer>();
 		rdList = new ArrayList<Integer>();
@@ -37,6 +37,9 @@ void genConstellations(int N, int WORKGROUP_SIZE) {
 		this.N = N;
 		final int halfN = (N + 1) / 2;
 		startConstellations = new HashSet<Integer>();
+
+		// set number of preset queens
+		this.preQueens = preQueens;
 
 		// calculating start constellations with the first Queen on square (0,0) (corner) 
 		for(int j = 1; j < N-2; j++) {						// j is idx of Queen in last row				

src/de/nqueensfaf/compute/GpuSolver.java

@@ -86,6 +86,7 @@ public class GpuSolver extends Solver {
 	private long kernel;
 	private Long ldMem, rdMem, colMem, startjklMem, resMem, progressMem;
 	private int WORKGROUP_SIZE = 64;
+	private int PRE_QUEENS = 5;
 	private int globalWorkSize;
 
 	// calculation related stuff
@@ -351,7 +352,7 @@ private void init(MemoryStack stack) {
 	private void transferDataToDevice(MemoryStack stack) {
 		if(savedDuration == 0) {		// if duration is 0, then restore() was not called
 			generator = new GpuConstellationsGenerator();
-			generator.genConstellations(N, WORKGROUP_SIZE);
+			generator.genConstellations(N, WORKGROUP_SIZE, PRE_QUEENS);
 
 			ldList = generator.ldList;
 			rdList = generator.rdList;
@@ -733,7 +734,7 @@ public int getGlobalWorkSize() {
 	public int getWorkgroupSize() {
 		return WORKGROUP_SIZE;
 	}
-	
+
 	// sets WORKGROUP_SIZE
 	public void setWorkgroupSize(int s) {
 		if(device == 0) {
@@ -745,6 +746,14 @@ public void setWorkgroupSize(int s) {
 		}
 		WORKGROUP_SIZE = s;
 	}
+
+	// sets PRE_QUEENS
+	public void setNumberOfPresetQueens(int pq) {
+		if(pq < 4 || pq > 10) {
+			throw new IllegalArgumentException("Number of preset queens must be between 4 and 10");
+		}
+		PRE_QUEENS = pq;
+	}
 
 	// record class for saving and restoring
 	private record RestorationInformation(int N, long duration, long solutions, int startConstCount,