fix sliders disappearing when multiple sliders are active or when later sliders is done earlier (2b maps etc)

src/itdelatrisu/opsu/Utils.java

@@ -661,4 +661,13 @@ public class Utils {
 		};
 	}
 
+	public static class Pair<F, S> {
+		public F first;
+		public S second;
+		public Pair(F first, S second) {
+			this.first = first;
+			this.second = second;
+		}
+	}
+
 }

src/itdelatrisu/opsu/objects/Slider.java

@@ -466,13 +466,14 @@ public class Slider extends GameObject {
 		int curvelen = curve.getCurvePoints().length;
 		if (Options.isMergingSliders()) {
 			if (Options.isShrinkingSliders() && curveIntervalFrom > 0) {
-				if (repeats % 2 == 0) {
+				if (hitObject.getRepeatCount() % 2 == 0) {
-					game.spliceSliderCurve(baseSliderFrom + (int) ((1d - curveIntervalFrom) * curvelen) - 1, baseSliderFrom + curvelen);
+					game.addMergedSliderPointsToRender(baseSliderFrom, baseSliderFrom + (int) ((1d - curveIntervalFrom) * curvelen));
 				} else {
-					game.setSlidercurveFrom(baseSliderFrom + (int) (curveIntervalFrom * curvelen) + 1);
+					game.addMergedSliderPointsToRender(baseSliderFrom + (int) (curveIntervalFrom * curvelen) + 1, baseSliderFrom + (int) (curveIntervalTo * curve.getCurvePoints().length));
 				}
+			} else {
+				game.addMergedSliderPointsToRender(baseSliderFrom, baseSliderFrom + (int) (curveIntervalTo * curve.getCurvePoints().length));
 			}
-			game.setSlidercurveTo(baseSliderFrom + (int) (curveIntervalTo * curve.getCurvePoints().length));
 		} else {
 			if (Options.isShrinkingSliders() && curveIntervalFrom > 0 && repeats % 2 == 0) {
 				if (Options.isFallbackSliders()) {
@@ -687,9 +688,6 @@ public class Slider extends GameObject {
 
 			// calculate and send slider result
 			hitResult();
-			if (Options.isMergingSliders()) {
-				game.setSlidercurveFrom(baseSliderFrom + curve.getCurvePoints().length + 1);
-			}
 			return true;
 		}
 

src/itdelatrisu/opsu/objects/curves/Curve.java

@@ -20,7 +20,6 @@ package itdelatrisu.opsu.objects.curves;
 
 import itdelatrisu.opsu.GameImage;
 import itdelatrisu.opsu.Options;
-import itdelatrisu.opsu.Utils;
 import itdelatrisu.opsu.beatmap.HitObject;
 import itdelatrisu.opsu.render.CurveRenderState;
 import itdelatrisu.opsu.skins.Skin;
@@ -31,7 +30,6 @@ import org.lwjgl.opengl.GLContext;
 import org.newdawn.slick.Color;
 import org.newdawn.slick.Image;
 import org.newdawn.slick.util.Log;
-import yugecin.opsudance.objects.curves.FakeCombinedCurve;
 
 /**
  * Representation of a curve.
@@ -43,7 +41,7 @@ public abstract class Curve {
 	protected static float CURVE_POINTS_SEPERATION = 2.5f;
 
 	/** The curve border color. */
-	private static Color borderColor;
+	protected static Color borderColor;
 
 	/** Whether mmsliders are supported. */
 	private static boolean mmsliderSupported = false;
@@ -58,7 +56,7 @@ public abstract class Curve {
 	protected float[] sliderX, sliderY;
 
 	/** Per-curve render-state used for the new style curve renders. */
-	private CurveRenderState renderState;
+	protected CurveRenderState renderState;
 
 	/** Points along the curve (set by inherited classes). */
 	public Vec2f[] curve;
@@ -150,14 +148,14 @@ public abstract class Curve {
 		// mmsliders
 		else {
 			if (renderState == null)
-				renderState = new CurveRenderState(hitObject, curve, this instanceof FakeCombinedCurve);
+				renderState = new CurveRenderState(hitObject, curve, false);
 			renderState.draw(color, borderColor, from, to);
 		}
 	}
 
 	public void splice(int from, int to) {
 		if (renderState == null)
-			renderState = new CurveRenderState(hitObject, curve, this instanceof FakeCombinedCurve);
+			renderState = new CurveRenderState(hitObject, curve, false);
 		renderState.splice(from, to);
 	}
 

src/itdelatrisu/opsu/render/CurveRenderState.java

@@ -26,6 +26,7 @@ import itdelatrisu.opsu.objects.curves.Vec2f;
 import java.nio.ByteBuffer;
 import java.nio.FloatBuffer;
 import java.nio.IntBuffer;
+import java.util.LinkedList;
 
 import org.lwjgl.BufferUtils;
 import org.lwjgl.opengl.EXTFramebufferObject;
@@ -69,6 +70,8 @@ public class CurveRenderState {
 	private int spliceFrom;
 	private int spliceTo;
 
+	protected LinkedList<Utils.Pair<Integer, Integer>> pointsToRender;
+
 	private final int mirrors;
 
 	/**
@@ -138,6 +141,14 @@ public class CurveRenderState {
 		lastPointDrawn = -1; // force redraw
 	}
 
+	public void draw(Color color, Color borderColor, LinkedList<Utils.Pair<Integer, Integer>> pointsToRender) {
+		lastPointDrawn = -1;
+		firstPointDrawn = -1;
+		this.pointsToRender = pointsToRender;
+		draw(color, borderColor, 0, curve.length);
+		this.pointsToRender = null;
+	}
+
 	/**
 	 * Draw a curve to the screen that's tinted with `color`. The first time
 	 * this is called this caches the image result of the curve and on subsequent
@@ -348,7 +359,11 @@ public class CurveRenderState {
 			max = 1;
 		}
 		for (int i = 0; i < max; i++) {
+			if (pointsToRender == null) {
 				renderCurve(from, to, i);
+			} else {
+				renderCurve(i);
+			}
 		}
 		GL11.glFlush();
 		GL20.glDisableVertexAttribArray(staticState.texCoordLoc);
@@ -370,6 +385,15 @@ public class CurveRenderState {
 		}
 	}
 
+	private void renderCurve(int mirror) {
+		for (Utils.Pair<Integer, Integer> point : pointsToRender) {
+			for (int i = point.first * 2; i < point.second * 2 - 1; ++i) {
+				final int index = i + curve.length * 2 * mirror;
+				GL11.glDrawArrays(GL11.GL_TRIANGLE_FAN, index * (NewCurveStyleState.DIVIDES + 2), NewCurveStyleState.DIVIDES + 2);
+			}
+		}
+	}
+
 	/**
 	 * Fill {@code buff} with the texture coordinates and positions for a cone
 	 * that has its center at the coordinates {@code (x1,y1)}.

src/itdelatrisu/opsu/states/Game.java

@@ -382,17 +382,6 @@ public class Game extends ComplexOpsuState {
 		if (objectIndex > 0) {
 			objectIndex--;
 		}
-		if (Options.isMergingSliders()) {
-			int obj = objectIndex;
-			while (obj < gameObjects.length) {
-				if (gameObjects[obj] instanceof Slider) {
-					slidercurveFrom = slidercurveTo = ((Slider) gameObjects[obj]).baseSliderFrom;
-					break;
-				}
-				obj++;
-			}
-			spliceSliderCurve(-1, -1);
-		}
 		Dancer.instance.setObjectIndex(objectIndex);
 		storyboardOverlay.updateIndex(objectIndex);
 		lastReplayTime = beatmap.objects[objectIndex].getTime();
@@ -1680,9 +1669,6 @@ public class Game extends ComplexOpsuState {
 			}
 		}
 
-		slidercurveFrom = 0;
-		slidercurveTo = 0;
-
 		Dancer.instance.setGameObjects(gameObjects);
 		storyboardOverlay.setGameObjects(gameObjects);
 		if (!skippedToCheckpoint) {
@@ -1738,19 +1724,8 @@ public class Game extends ComplexOpsuState {
 			GameMod.loadModState(previousMods);
 	}
 
-	private int slidercurveFrom;
+	public void addMergedSliderPointsToRender(int from, int to) {
-	private int slidercurveTo;
+		knorkesliders.addRange(from, to);
-
-	public void setSlidercurveFrom(int slidercurveFrom) {
-		this.slidercurveFrom = Math.max(slidercurveFrom, this.slidercurveFrom);
-	}
-
-	public void setSlidercurveTo(int slidercurveTo) {
-		this.slidercurveTo = Math.max(slidercurveTo, this.slidercurveTo);
-	}
-
-	public void spliceSliderCurve(int from, int to) {
-		this.knorkesliders.splice(from, to);
 	}
 
 	/**
@@ -1767,7 +1742,8 @@ public class Game extends ComplexOpsuState {
 		}
 
 		if (Options.isMergingSliders() && knorkesliders != null) {
-			knorkesliders.draw(Color.white, this.slidercurveFrom, this.slidercurveTo);
+			knorkesliders.draw(Color.white);
+			knorkesliders.initForFrame();
 			/*
 			if (Options.isMirror()) {
 				g.pushTransform();

src/yugecin/opsudance/objects/curves/FakeCombinedCurve.java

@@ -17,15 +17,38 @@
  */
 package yugecin.opsudance.objects.curves;
 
+import itdelatrisu.opsu.Utils;
 import itdelatrisu.opsu.beatmap.HitObject;
 import itdelatrisu.opsu.objects.curves.Curve;
 import itdelatrisu.opsu.objects.curves.Vec2f;
+import itdelatrisu.opsu.render.CurveRenderState;
+import org.newdawn.slick.Color;
+
+import java.util.LinkedList;
 
 public class FakeCombinedCurve extends Curve {
 
+	private LinkedList<Utils.Pair<Integer, Integer>> pointsToRender;
+
 	public FakeCombinedCurve(Vec2f[] points) {
 		super(new HitObject(0, 0, 0), false);
 		this.curve = points;
+		pointsToRender = new LinkedList<>();
+	}
+
+	public void initForFrame() {
+		pointsToRender.clear();
+	}
+
+	public void addRange(int from, int to) {
+		pointsToRender.add(new Utils.Pair<>(from, to));
+	}
+
+	@Override
+	public void draw(Color color) {
+		if (renderState == null)
+			renderState = new CurveRenderState(hitObject, curve, true);
+		renderState.draw(color, borderColor, pointsToRender);
 	}
 
 	@Override