attempts to merge mirrored curves

src/itdelatrisu/opsu/Utils.java

@@ -661,4 +661,15 @@ public class Utils {
 		};
 	}
 
+	public static float[] mirrorPoint(float x, float y, float degrees) {
+		double dx = x - Options.width / 2d;
+		double dy = y - Options.height / 2d;
+		double ang = Math.atan2(dy, dx) + (degrees * Math.PI / 180d);
+		double d = Math.sqrt(dx * dx + dy * dy);
+		return new float[]{
+			(float) (Options.width / 2d + Math.cos(ang) * d),
+			(float) (Options.height / 2d + Math.sin(ang) * d)
+		};
+	}
+
 }

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

@@ -31,6 +31,7 @@ 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.
@@ -149,14 +150,14 @@ public abstract class Curve {
 		// mmsliders
 		else {
 			if (renderState == null)
-				renderState = new CurveRenderState(hitObject, curve);
+				renderState = new CurveRenderState(hitObject, curve, this instanceof FakeCombinedCurve);
 			renderState.draw(color, borderColor, from, to);
 		}
 	}
 
 	public void splice(int from, int to) {
 		if (renderState == null)
-			renderState = new CurveRenderState(hitObject, curve);
+			renderState = new CurveRenderState(hitObject, curve, this instanceof FakeCombinedCurve);
 		renderState.splice(from, to);
 	}
 

src/itdelatrisu/opsu/render/CurveRenderState.java

@@ -18,6 +18,7 @@
 package itdelatrisu.opsu.render;
 
 import itdelatrisu.opsu.GameImage;
+import itdelatrisu.opsu.Options;
 import itdelatrisu.opsu.Utils;
 import itdelatrisu.opsu.beatmap.HitObject;
 import itdelatrisu.opsu.objects.Circle;
@@ -31,7 +32,6 @@ import org.lwjgl.BufferUtils;
 import org.lwjgl.opengl.EXTFramebufferObject;
 import org.lwjgl.opengl.GL11;
 import org.lwjgl.opengl.GL13;
-import org.lwjgl.opengl.GL14;
 import org.lwjgl.opengl.GL15;
 import org.lwjgl.opengl.GL20;
 import org.newdawn.slick.Color;
@@ -69,6 +69,8 @@ public class CurveRenderState {
 	private int spliceFrom;
 	private int spliceTo;
 
+	private final int mirrors;
+
 	/**
 	 * Set the width and height of the container that Curves get drawn into.
 	 * Should be called before any curves are drawn.
@@ -102,9 +104,14 @@ public class CurveRenderState {
 	 * @param hitObject the HitObject that represents this curve, just used as a unique ID
 	 * @param curve the points along the curve to be drawn
 	 */
-	public CurveRenderState(HitObject hitObject, Vec2f[] curve) {
+	public CurveRenderState(HitObject hitObject, Vec2f[] curve, boolean isKnorkeSlider) {
 		this.hitObject = hitObject;
 		this.curve = curve;
+		if (isKnorkeSlider) {
+			this.mirrors = Options.getMergingSlidersMirrorPool();
+		} else {
+			this.mirrors = 1;
+		}
 		initFBO();
 	}
 
@@ -280,14 +287,18 @@ public class CurveRenderState {
 	 */
 	private void createVertexBuffer(int bufferID) {
 		int arrayBufferBinding = GL11.glGetInteger(GL15.GL_ARRAY_BUFFER_BINDING);
-		FloatBuffer buff = BufferUtils.createByteBuffer(4 * (4 + 2) * (2 * curve.length - 1) * (NewCurveStyleState.DIVIDES + 2)).asFloatBuffer();
+		FloatBuffer buff = BufferUtils.createByteBuffer(4 * (4 + 2) * (2 * curve.length * mirrors - 1) * (NewCurveStyleState.DIVIDES + 2)).asFloatBuffer();
 		if (curve.length > 0) {
-			fillCone(buff, curve[0].x, curve[0].y);
+			fillCone(buff, curve[0].x, curve[0].y, 0);
 		}
+
+		for (int mirror = 0; mirror < mirrors; mirror++) {
+			//final float angle = 360f * mirror / mirrors;
+			final float angle = 180f;
 			for (int i = 1; i < curve.length; ++i) {
 				float x = curve[i].x;
 				float y = curve[i].y;
-			fillCone(buff, x, y);
+				fillCone(buff, x, y, angle);
 				float last_x = curve[i - 1].x;
 				float last_y = curve[i - 1].y;
 				double diff_x = x - last_x;
@@ -301,7 +312,8 @@ public class CurveRenderState {
 					x = -100f;
 					y = -100f;
 				}
-			fillCone(buff, x, y);
+				fillCone(buff, x, y, angle);
+			}
 		}
 		buff.flip();
 		GL15.glBindBuffer(GL15.GL_ARRAY_BUFFER, bufferID);
@@ -332,11 +344,9 @@ public class CurveRenderState {
 		if (clearFirst) {
 			GL11.glClear(GL11.GL_COLOR_BUFFER_BIT | GL11.GL_DEPTH_BUFFER_BIT);
 		}
-		for (int i = from * 2; i < to * 2 - 1; ++i) {
+		renderCurve(from, to, 0);
-			if (spliceFrom <= i && i <= spliceTo) {
+		if (mirrors > 1 && Options.isMirror()) {
-				continue;
+			renderCurve(from, to, 1);
-			}
-			GL11.glDrawArrays(GL11.GL_TRIANGLE_FAN, i * (NewCurveStyleState.DIVIDES + 2), NewCurveStyleState.DIVIDES + 2);
 		}
 		GL11.glFlush();
 		GL20.glDisableVertexAttribArray(staticState.texCoordLoc);
@@ -344,6 +354,15 @@ public class CurveRenderState {
 		restoreRenderState(state);
 	}
 
+	private void renderCurve(int from, int to, int mirror) {
+		for (int i = from * 2; i < to * 2 - 1; ++i) {
+			if (spliceFrom <= i && i <= spliceTo) {
+				continue;
+			}
+			GL11.glDrawArrays(GL11.GL_TRIANGLE_FAN, i * (NewCurveStyleState.DIVIDES + 2) + mirror * curve.length, 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)}.
@@ -351,7 +370,12 @@ public class CurveRenderState {
 	 * @param x1 x-coordinate of the cone
 	 * @param y1 y-coordinate of the cone
 	 */
-	protected void fillCone(FloatBuffer buff, float x1, float y1) {
+	protected void fillCone(FloatBuffer buff, float x1, float y1, float angle) {
+		if (mirrors > 1) {
+			float[] m = Utils.mirrorPoint(x1, y1, angle);
+			x1 = m[0];
+			y1 = m[1];
+		}
 		float divx = containerWidth / 2.0f;
 		float divy = containerHeight / 2.0f;
 		float offx = -1.0f;

src/itdelatrisu/opsu/states/Game.java

@@ -1692,12 +1692,14 @@ public class Game extends BasicGameState {
 
 		if (Options.isMergingSliders() && knorkesliders != null) {
 			knorkesliders.draw(Color.white, this.slidercurveFrom, this.slidercurveTo);
+			/*
 			if (Options.isMirror()) {
 				g.pushTransform();
 				g.rotate(Options.width / 2f, Options.height / 2f, 180f);
 				knorkesliders.draw(Color.white, this.slidercurveFrom, this.slidercurveTo);
 				g.popTransform();
 			}
+			*/
 		}
 
 		// include previous object in follow points