Merge pull request #134 from Bigpet/snakeslider

Snaking sliders implementation.

src/itdelatrisu/opsu/GameData.java

@@ -907,7 +907,7 @@ public class GameData {
 						float oldColorAlpha = hitResult.color.a;
 						Colors.WHITE_FADE.a = alpha;
 						hitResult.color.a = alpha;
-						hitResult.curve.draw(hitResult.color);
+						hitResult.curve.draw(hitResult.color,1.0f);
 						Colors.WHITE_FADE.a = oldWhiteAlpha;
 						hitResult.color.a = oldColorAlpha;
 					}

src/itdelatrisu/opsu/Options.java

@@ -417,6 +417,7 @@ public class Options {
 		BACKGROUND_DIM ("Background Dim", "DimLevel", "Percentage to dim the background image during gameplay.", 50, 0, 100),
 		FORCE_DEFAULT_PLAYFIELD ("Force Default Playfield", "ForceDefaultPlayfield", "Override the song background with the default playfield background.", false),
 		IGNORE_BEATMAP_SKINS ("Ignore All Beatmap Skins", "IgnoreBeatmapSkins", "Never use skin element overrides provided by beatmaps.", false),
+		SNAKING_SLIDERS ("Snaking sliders", "SnakingSliders", "Sliders gradually snake out from their starting point.", true),
 		SHOW_HIT_LIGHTING ("Show Hit Lighting", "HitLighting", "Adds an effect behind hit explosions.", true),
 		SHOW_COMBO_BURSTS ("Show Combo Bursts", "ComboBurst", "A character image is displayed at combo milestones.", true),
 		SHOW_PERFECT_HIT ("Show Perfect Hits", "PerfectHit", "Whether to show perfect hit result bursts (300s, slider ticks).", true),
@@ -941,6 +942,12 @@ public class Options {
 	 */
 	public static boolean isBeatmapSkinIgnored() { return GameOption.IGNORE_BEATMAP_SKINS.getBooleanValue(); }
 
+	/**
+	 * Returns whether or not sliders should snake in or just appear fully at once.
+	 * @return true if sliders should snake in
+	 */
+	public static boolean isSliderSnaking() { return GameOption.SNAKING_SLIDERS.getBooleanValue(); }
+
 	/**
 	 * Returns the fixed circle size override, if any.
 	 * @return the CS value (0, 10], 0f if disabled

src/itdelatrisu/opsu/objects/Slider.java

@@ -30,6 +30,7 @@ import itdelatrisu.opsu.objects.curves.Curve;
 import itdelatrisu.opsu.objects.curves.Vec2f;
 import itdelatrisu.opsu.states.Game;
 import itdelatrisu.opsu.ui.Colors;
+import itdelatrisu.opsu.ui.animations.AnimationEquation;
 
 import org.newdawn.slick.Color;
 import org.newdawn.slick.GameContainer;
@@ -179,20 +180,27 @@ public class Slider implements GameObject {
 		float approachScale = 1 + scale * 3;
 		float fadeinScale = (timeDiff - approachTime + fadeInTime) / (float) fadeInTime;
 		float alpha = Utils.clamp(1 - fadeinScale, 0, 1);
+		float decorationsAlpha = Utils.clamp(-2.0f * fadeinScale, 0, 1);
 		boolean overlayAboveNumber = Options.getSkin().isHitCircleOverlayAboveNumber();
-
 		float oldAlpha = Colors.WHITE_FADE.a;
 		Colors.WHITE_FADE.a = color.a = alpha;
 		Image hitCircleOverlay = GameImage.HITCIRCLE_OVERLAY.getImage();
 		Image hitCircle = GameImage.HITCIRCLE.getImage();
 		Vec2f endPos = curve.pointAt(1);
 
-		curve.draw(color);
+		float curveInterval;
+		if(Options.isSliderSnaking()){
+			curveInterval = alpha;
+		} else {
+			curveInterval = 1.0f;
+		}
+		curve.draw(color,curveInterval);
 		color.a = alpha;
 
 		// end circle
-		hitCircle.drawCentered(endPos.x, endPos.y, color);
+		Vec2f endCircPos = curve.pointAt(curveInterval);
-		hitCircleOverlay.drawCentered(endPos.x, endPos.y, Colors.WHITE_FADE);
+		hitCircle.drawCentered(endCircPos.x, endCircPos.y, color);
+		hitCircleOverlay.drawCentered(endCircPos.x, endCircPos.y, Colors.WHITE_FADE);
 
 		// start circle
 		hitCircle.drawCentered(x, y, color);
@@ -201,10 +209,13 @@ public class Slider implements GameObject {
 
 		// ticks
 		if (ticksT != null) {
-			Image tick = GameImage.SLIDER_TICK.getImage();
+			float tickScale = 0.5f + 0.5f*AnimationEquation.OUT_BACK.calc(decorationsAlpha);
+			Image tick = GameImage.SLIDER_TICK.getImage().getScaledCopy(tickScale);
 			for (int i = 0; i < ticksT.length; i++) {
 				Vec2f c = curve.pointAt(ticksT[i]);
-				tick.drawCentered(c.x, c.y, Colors.WHITE_FADE);
+				Colors.WHITE_FADE.a = decorationsAlpha;
+				tick.drawCentered(c.x , c.y , Colors.WHITE_FADE);
+				Colors.WHITE_FADE.a = alpha;
 			}
 		}
 		if (GameMod.HIDDEN.isActive()) {
@@ -224,16 +235,23 @@ public class Slider implements GameObject {
 			hitCircleOverlay.drawCentered(x, y, Colors.WHITE_FADE);
 
 		// repeats
+		if (curveInterval == 1.0f) {
 			for (int tcurRepeat = currentRepeats; tcurRepeat <= currentRepeats + 1; tcurRepeat++) {
 				if (hitObject.getRepeatCount() - 1 > tcurRepeat) {
 					Image arrow = GameImage.REVERSEARROW.getImage();
 					if (tcurRepeat != currentRepeats) {
-					if (sliderTime == 0)
+						if (sliderTime == 0) {
 							continue;
+						}
 						float t = Math.max(getT(trackPosition, true), 0);
 						arrow.setAlpha((float) (t - Math.floor(t)));
-				} else
+					} else {
+						if(Options.isSliderSnaking()){
+							arrow.setAlpha(decorationsAlpha);
+						} else {
 							arrow.setAlpha(1f);
+						}
+					}
 					if (tcurRepeat % 2 == 0) {
 						// last circle
 						arrow.setRotation(curve.getEndAngle());
@@ -245,6 +263,7 @@ public class Slider implements GameObject {
 					}
 				}
 			}
+		}
 
 		if (timeDiff >= 0) {
 			// approach circle

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

@@ -20,6 +20,7 @@ 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;
@@ -111,28 +112,31 @@ public abstract class Curve {
 	public abstract Vec2f pointAt(float t);
 
 	/**
-	 * Draws the full curve to the graphics context.
+	 * Draws the curve in the range [0, t] (where the full range is [0, 1]) to the graphics context.
 	 * @param color the color filter
+	 * @param t set the curve interval to [0, t]
 	 */
-	public void draw(Color color) {
+	public void draw(Color color, float t) {
 		if (curve == null)
 			return;
 
+		t = Utils.clamp(t, 0.0f, 1.0f);
 		// peppysliders
 		if (Options.getSkin().getSliderStyle() == Skin.STYLE_PEPPYSLIDER || !mmsliderSupported) {
+			int drawUpTo = (int)(curve.length*t);
 			Image hitCircle = GameImage.HITCIRCLE.getImage();
 			Image hitCircleOverlay = GameImage.HITCIRCLE_OVERLAY.getImage();
-			for (int i = 0; i < curve.length; i++)
+			for (int i = 0; i < drawUpTo; i++)
 				hitCircleOverlay.drawCentered(curve[i].x, curve[i].y, Colors.WHITE_FADE);
-			for (int i = 0; i < curve.length; i++)
+			for (int i = 0; i < drawUpTo; i++)
 				hitCircle.drawCentered(curve[i].x, curve[i].y, color);
 		}
 
 		// mmsliders
 		else {
 			if (renderState == null)
-				renderState = new CurveRenderState(hitObject);
+				renderState = new CurveRenderState(hitObject,curve);
-			renderState.draw(color, borderColor, curve);
+			renderState.draw(color, borderColor, t);
 		}
 	}
 

src/itdelatrisu/opsu/render/CurveRenderState.java

@@ -18,9 +18,9 @@
 package itdelatrisu.opsu.render;
 
 import itdelatrisu.opsu.GameImage;
+import itdelatrisu.opsu.Utils;
 import itdelatrisu.opsu.beatmap.HitObject;
 import itdelatrisu.opsu.objects.curves.Vec2f;
-import itdelatrisu.opsu.ui.Colors;
 
 import java.nio.ByteBuffer;
 import java.nio.FloatBuffer;
@@ -59,6 +59,12 @@ public class CurveRenderState {
 	/** The HitObject associated with the curve to be drawn. */
 	protected HitObject hitObject;
 
+	/** the points along the curve to be drawn */
+	protected Vec2f[] curve;
+	
+	/** The point to which the curve has last been rendered into the texture (as an index into {@code curve}) */
+	private int lastPointDrawn;
+
 	/**
 	 * Set the width and height of the container that Curves get drawn into.
 	 * Should be called before any curves are drawn.
@@ -74,11 +80,12 @@ public class CurveRenderState {
 		scale = (int) (circleDiameter * HitObject.getXMultiplier());  // convert from Osupixels (640x480)
 		//scale = scale * 118 / 128; //for curves exactly as big as the sliderball
 		FrameBufferCache.init(width, height);
+		NewCurveStyleState.initUnitCone();
 	}
 
 	/**
 	 * Undo the static state. Static state setup caused by calls to
-	 * {@link #draw(org.newdawn.slick.Color, org.newdawn.slick.Color, itdelatrisu.opsu.objects.curves.Vec2f[])}
+	 * {@link #draw(org.newdawn.slick.Color, org.newdawn.slick.Color, float)}
 	 * are undone.
 	 */
 	public static void shutdown() {
@@ -89,10 +96,12 @@ public class CurveRenderState {
 	/**
 	 * Creates an object to hold the render state that's necessary to draw a curve.
 	 * @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) {
+	public CurveRenderState(HitObject hitObject, Vec2f[] curve) {
 		fbo = null;
 		this.hitObject = hitObject;
+		this.curve = curve;
 	}
 
 	/**
@@ -101,9 +110,10 @@ public class CurveRenderState {
 	 * runs it just draws the cached copy to the screen.
 	 * @param color tint of the curve
 	 * @param borderColor the curve border color
-	 * @param curve the points along the curve to be drawn
+	 * @param t the point up to which the curve should be drawn (in the interval [0, 1])
 	 */
-	public void draw(Color color, Color borderColor, Vec2f[] curve) {
+	public void draw(Color color, Color borderColor, float t) {
+		t = Utils.clamp(t, 0.0f, 1.0f);
 		float alpha = color.a;
 
 		// if this curve hasn't been drawn, draw it and cache the result
@@ -113,26 +123,40 @@ public class CurveRenderState {
 			if (mapping == null)
 				mapping = cache.insert(hitObject);
 			fbo = mapping;
+			createVertexBuffer(fbo.getVbo());
+			//write impossible value to make sure the fbo is cleared
+			lastPointDrawn = -1;
+		}
+		
+		int drawUpTo = (int) (t * curve.length);
+		
+		if (lastPointDrawn != drawUpTo) {
+			
+			if (drawUpTo == lastPointDrawn) {
+				return;
+			}
 
 			int oldFb = GL11.glGetInteger(EXTFramebufferObject.GL_FRAMEBUFFER_BINDING_EXT);
 			int oldTex = GL11.glGetInteger(GL11.GL_TEXTURE_BINDING_2D);
-
 			//glGetInteger requires a buffer of size 16, even though just 4
 			//values are returned in this specific case
 			IntBuffer oldViewport = BufferUtils.createIntBuffer(16);
 			GL11.glGetInteger(GL11.GL_VIEWPORT, oldViewport);
 			EXTFramebufferObject.glBindFramebufferEXT(EXTFramebufferObject.GL_FRAMEBUFFER_EXT, fbo.getID());
 			GL11.glViewport(0, 0, fbo.width, fbo.height);
+			if (lastPointDrawn <= 0 || lastPointDrawn > drawUpTo) {
+				lastPointDrawn = 0;
 				GL11.glClearColor(0.0f, 0.0f, 0.0f, 0.0f);
 				GL11.glClear(GL11.GL_COLOR_BUFFER_BIT | GL11.GL_DEPTH_BUFFER_BIT);
-			Colors.WHITE_FADE.a = 1.0f;
+			}
-			this.draw_curve(color, borderColor, curve);
+
+			this.renderCurve(color, borderColor, lastPointDrawn, drawUpTo);
+			lastPointDrawn = drawUpTo;
 			color.a = 1f;
 
 			GL11.glBindTexture(GL11.GL_TEXTURE_2D, oldTex);
 			EXTFramebufferObject.glBindFramebufferEXT(EXTFramebufferObject.GL_FRAMEBUFFER_EXT, oldFb);
 			GL11.glViewport(oldViewport.get(0), oldViewport.get(1), oldViewport.get(2), oldViewport.get(3));
-			Colors.WHITE_FADE.a = alpha;
 		}
 
 		// draw a fullscreen quad with the texture that contains the curve
@@ -180,7 +204,7 @@ public class CurveRenderState {
 	 * Backup the current state of the relevant OpenGL state and change it to
 	 * what's needed to draw the curve.
 	 */
-	private RenderState startRender() {
+	private RenderState saveRenderState() {
 		RenderState state = new RenderState();
 		state.smoothedPoly = GL11.glGetBoolean(GL11.GL_POLYGON_SMOOTH);
 		state.blendEnabled = GL11.glGetBoolean(GL11.GL_BLEND);
@@ -219,7 +243,7 @@ public class CurveRenderState {
 	 * Restore the old OpenGL state that's backed up in {@code state}.
 	 * @param state the old state to restore
 	 */
-	private void endRender(RenderState state) {
+	private void restoreRenderState(RenderState state) {
 		GL11.glMatrixMode(GL11.GL_PROJECTION);
 		GL11.glPopMatrix();
 		GL11.glMatrixMode(GL11.GL_MODELVIEW);
@@ -241,24 +265,18 @@ public class CurveRenderState {
 	}
 
 	/**
-	 * Do the actual drawing of the curve into the currently bound framebuffer.
+	 * Write the vertices and (with position and texture coordinates) for the full
-	 * @param color the color of the curve
+	 * curve into the OpenGL buffer with the ID specified by {@code bufferID}
-	 * @param borderColor the curve border color
+	 * @param bufferID the buffer ID for the OpenGL buffer the vertices should be written into
-	 * @param curve the points along the curve
 	 */
-	private void draw_curve(Color color, Color borderColor, Vec2f[] curve) {
+	private void createVertexBuffer(int bufferID)
-		staticState.initGradient();
+	{
-		RenderState state = startRender();
+		int arrayBufferBinding = GL11.glGetInteger(GL15.GL_ARRAY_BUFFER_BINDING);
-		int vtx_buf;
-		// the size is: floatsize * (position + texture coordinates) * (number of cones) * (vertices in a cone)
 		FloatBuffer buff = BufferUtils.createByteBuffer(4 * (4 + 2) * (2 * curve.length - 1) * (NewCurveStyleState.DIVIDES + 2)).asFloatBuffer();
-		staticState.initShaderProgram();
-		vtx_buf = GL15.glGenBuffers();
 		for (int i = 0; i < curve.length; ++i) {
 			float x = curve[i].x;
 			float y = curve[i].y;
-			//if (i == 0 || i == curve.length - 1){
+			fillCone(buff, x, y);
-			fillCone(buff, x, y, NewCurveStyleState.DIVIDES);
 			if (i != 0) {
 				float last_x = curve[i - 1].x;
 				float last_y = curve[i - 1].y;
@@ -266,12 +284,25 @@ public class CurveRenderState {
 				double diff_y = y - last_y;
 				x = (float) (x - diff_x / 2);
 				y = (float) (y - diff_y / 2);
-				fillCone(buff, x, y, NewCurveStyleState.DIVIDES);
+				fillCone(buff, x, y);
 			}
 		}
 		buff.flip();
-		GL15.glBindBuffer(GL15.GL_ARRAY_BUFFER, vtx_buf);
+		GL15.glBindBuffer(GL15.GL_ARRAY_BUFFER, bufferID);
 		GL15.glBufferData(GL15.GL_ARRAY_BUFFER, buff, GL15.GL_STATIC_DRAW);
+		GL15.glBindBuffer(GL15.GL_ARRAY_BUFFER, arrayBufferBinding);
+	}
+	
+	/**
+	 * Do the actual drawing of the curve into the currently bound framebuffer.
+	 * @param color the color of the curve
+	 * @param borderColor the curve border color
+	 */
+	private void renderCurve(Color color, Color borderColor, int from, int to) {
+		staticState.initGradient();
+		RenderState state = saveRenderState();
+		staticState.initShaderProgram();
+		GL15.glBindBuffer(GL15.GL_ARRAY_BUFFER, fbo.getVbo());
 		GL20.glUseProgram(staticState.program);
 		GL20.glEnableVertexAttribArray(staticState.attribLoc);
 		GL20.glEnableVertexAttribArray(staticState.texCoordLoc);
@@ -282,63 +313,37 @@ public class CurveRenderState {
 		//2*4 is for skipping the first 2 floats (u,v)
 		GL20.glVertexAttribPointer(staticState.attribLoc, 4, GL11.GL_FLOAT, false, 6 * 4, 2 * 4);
 		GL20.glVertexAttribPointer(staticState.texCoordLoc, 2, GL11.GL_FLOAT, false, 6 * 4, 0);
-		for (int i = 0; i < curve.length * 2 - 1; ++i)
+		for (int i = from*2; i < to * 2 - 1; ++i)
 			GL11.glDrawArrays(GL11.GL_TRIANGLE_FAN, i * (NewCurveStyleState.DIVIDES + 2), NewCurveStyleState.DIVIDES + 2);
+		GL11.glFlush();
 		GL20.glDisableVertexAttribArray(staticState.texCoordLoc);
 		GL20.glDisableVertexAttribArray(staticState.attribLoc);
-		GL15.glDeleteBuffers(vtx_buf);
+		restoreRenderState(state);
-		endRender(state);
 	}
 
 	/**
 	 * Fill {@code buff} with the texture coordinates and positions for a cone
-	 * with {@code DIVIDES} ground corners that has its center at the coordinates
+	 * that has its center at the coordinates {@code (x1,y1)}.
-	 * {@code (x1,y1)}.
 	 * @param buff the buffer to be filled
 	 * @param x1 x-coordinate of the cone
 	 * @param y1 y-coordinate of the cone
-	 * @param DIVIDES the base of the cone is a regular polygon with this many sides
 	 */
-	protected void fillCone(FloatBuffer buff, float x1, float y1, final int DIVIDES) {
+	protected void fillCone(FloatBuffer buff, float x1, float y1) {
 		float divx = containerWidth / 2.0f;
 		float divy = containerHeight / 2.0f;
 		float offx = -1.0f;
 		float offy = 1.0f;
-		float x, y;
 		float radius = scale / 2;
-		buff.put(1.0f);
+		
-		buff.put(0.5f);
+		for(int i = 0; i<NewCurveStyleState.unitCone.length/6; ++i)
-		//GL11.glTexCoord2d(1.0, 0.5);
+		{
-		x = offx + x1 / divx;
+			buff.put(NewCurveStyleState.unitCone[i*6+0]);
-		y = offy - y1 / divy;
+			buff.put(NewCurveStyleState.unitCone[i*6+1]);
-		buff.put(x);
+			buff.put(offx + (x1 + radius * NewCurveStyleState.unitCone[i*6+2])/divx);
-		buff.put(y);
+			buff.put(offy - (y1 + radius * NewCurveStyleState.unitCone[i*6+3])/divy);
-		buff.put(0f);
+			buff.put(NewCurveStyleState.unitCone[i*6+4]);
-		buff.put(1f);
+			buff.put(NewCurveStyleState.unitCone[i*6+5]);
-		//GL11.glVertex4f(x, y, 0.0f, 1.0f);
-		for (int j = 0; j < DIVIDES; ++j) {
-			double phase = j * (float) Math.PI * 2 / DIVIDES;
-			buff.put(0.0f);
-			buff.put(0.5f);
-			//GL11.glTexCoord2d(0.0, 0.5);
-			x = (x1 + radius * (float) Math.sin(phase)) / divx;
-			y = (y1 + radius * (float) Math.cos(phase)) / divy;
-			buff.put((offx + x));
-			buff.put((offy - y));
-			buff.put(1f);
-			buff.put(1f);
-			//GL11.glVertex4f(x + 90 * (float) Math.sin(phase), y + 90 * (float) Math.cos(phase), 1.0f, 1.0f);
 		}
-		buff.put(0.0f);
-		buff.put(0.5f);
-		//GL11.glTexCoord2d(0.0, 0.5);
-		x = (x1 + radius * (float) Math.sin(0.0)) / divx;
-		y = (y1 + radius * (float) Math.cos(0.0)) / divy;
-		buff.put((offx + x));
-		buff.put((offy - y));
-		buff.put(1f);
-		buff.put(1f);
-		//GL11.glVertex4f(x + 90 * (float) Math.sin(0.0), y + 90 * (float) Math.cos(0.0), 1.0f, 1.0f);
 	}
 
 	/**
@@ -354,6 +359,13 @@ public class CurveRenderState {
 		 */
 		protected static final int DIVIDES = 30;
 
+		/**
+		 * Array to hold the dummy vertex data (texture coordinates and position)
+		 * of a cone with DIVIDES vertices at its base, that is centered around
+		 * (0,0) and has a radius of 1 (so that it can be translated and scaled easily).
+		 */
+		protected static float[] unitCone = new float[(DIVIDES+2)*6];
+		
 		/** OpenGL shader program ID used to draw and recolor the curve. */
 		protected int program = 0;
 
@@ -398,6 +410,47 @@ public class CurveRenderState {
 			}
 		}
 
+		/**
+		 * Write the data into {@code unitCone} if it hasn't already been initialized. 
+		 */
+		public static void initUnitCone() {
+			int index = 0;
+			//check if initialization has already happened
+			if (unitCone[0] == 0.0f) {
+
+			//tip of the cone
+				//vec2 texture coordinates
+				unitCone[index++] = 1.0f;
+				unitCone[index++] = 0.5f;
+
+				//vec4 position
+				unitCone[index++] = 0.0f;
+				unitCone[index++] = 0.0f;
+				unitCone[index++] = 0.0f;
+				unitCone[index++] = 1.0f;
+				for (int j = 0; j < NewCurveStyleState.DIVIDES; ++j) {
+					double phase = j * (float) Math.PI * 2 / NewCurveStyleState.DIVIDES;
+					//vec2 texture coordinates
+					unitCone[index++] = 0.0f;
+					unitCone[index++] = 0.5f;
+					//vec4 positon
+					unitCone[index++] = (float) Math.sin(phase);
+					unitCone[index++] = (float) Math.cos(phase);
+					unitCone[index++] = 1.0f;
+					unitCone[index++] = 1.0f;
+				}
+				//vec2 texture coordinates
+				unitCone[index++] = 0.0f;
+				unitCone[index++] = 0.5f;
+				//vec4 positon
+				unitCone[index++] = (float) Math.sin(0.0f);
+				unitCone[index++] = (float) Math.cos(0.0f);
+				unitCone[index++] = 1.0f;
+				unitCone[index++] = 1.0f;
+			}
+
+		}
+
 		/**
 		 * Compiles and links the shader program for the new style curve objects
 		 * if it hasn't already been compiled and linked.

src/itdelatrisu/opsu/render/Rendertarget.java

@@ -21,6 +21,7 @@ import java.nio.ByteBuffer;
 
 import org.lwjgl.opengl.EXTFramebufferObject;
 import org.lwjgl.opengl.GL11;
+import org.lwjgl.opengl.GL15;
 
 /**
  * Represents a rendertarget. For now this maps to an OpenGL FBO via LWJGL.
@@ -31,6 +32,9 @@ public class Rendertarget {
 	/** The dimensions. */
 	public final int width, height;
 
+	/** ID of the vertex buffer associated with this rendertarget*/
+	private final int vboID;
+	
 	/** The FBO ID. */
 	private final int fboID;
 
@@ -49,6 +53,7 @@ public class Rendertarget {
 		this.width = width;
 		this.height = height;
 		fboID = EXTFramebufferObject.glGenFramebuffersEXT();
+		vboID = GL15.glGenBuffers();
 		textureID = GL11.glGenTextures();
 		depthBufferID = EXTFramebufferObject.glGenRenderbuffersEXT();
 	}
@@ -60,19 +65,27 @@ public class Rendertarget {
 		EXTFramebufferObject.glBindFramebufferEXT(EXTFramebufferObject.GL_FRAMEBUFFER_EXT, fboID);
 	}
 
+	
 	/**
-	 * Returns the FBO ID.
+	 * Get the ID of the VBO associated with this Rendertarget.
+	 * @return OpenGL buffer ID for the VBO
+	 */
+	public int getVbo() {
+		return vboID;
+	}
+	
+	/**
+	 * Get the FBO ID.
+	 * @return the OpenGL FBO ID
 	 */
-	// NOTE: use judiciously, try to avoid if possible and consider adding a
-	// method to this class if you find yourself calling this repeatedly.
 	public int getID() {
 		return fboID;
 	}
 
 	/**
-	 * Returns the texture ID.
+	 * Get the texture ID of the texture this rendertarget renders into.
+	 * @return the OpenGL texture ID
 	 */
-	// NOTE: try not to use, could be moved into separate class.
 	public int getTextureID() {
 		return textureID;
 	}
@@ -89,6 +102,7 @@ public class Rendertarget {
 	 * and a renderbuffer that it renders the depth to.
 	 * @param width the width
 	 * @param height the height
+	 * @return the newly created Rendertarget instance
 	*/
 	public static Rendertarget createRTTFramebuffer(int width, int height) {
 		int old_framebuffer = GL11.glGetInteger(EXTFramebufferObject.GL_FRAMEBUFFER_BINDING_EXT);
@@ -122,5 +136,6 @@ public class Rendertarget {
 		EXTFramebufferObject.glDeleteFramebuffersEXT(fboID);
 		EXTFramebufferObject.glDeleteRenderbuffersEXT(depthBufferID);
 		GL11.glDeleteTextures(textureID);
+		GL15.glDeleteBuffers(vboID);
 	}
 }

src/itdelatrisu/opsu/states/OptionsMenu.java

@@ -76,6 +76,7 @@ public class OptionsMenu extends BasicGameState {
 			GameOption.BACKGROUND_DIM,
 			GameOption.FORCE_DEFAULT_PLAYFIELD,
 			GameOption.IGNORE_BEATMAP_SKINS,
+			GameOption.SNAKING_SLIDERS,
 			GameOption.SHOW_HIT_LIGHTING,
 			GameOption.SHOW_COMBO_BURSTS,
 			GameOption.SHOW_PERFECT_HIT,