com.esotericsoftware.spine.attachments.VertexAttachment Maven / Gradle / Ivy
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package com.esotericsoftware.spine.attachments;
import java.util.concurrent.atomic.AtomicInteger;
import com.badlogic.gdx.utils.FloatArray;
import com.esotericsoftware.spine.Bone;
import com.esotericsoftware.spine.Skeleton;
import com.esotericsoftware.spine.Slot;
/** Base class for an attachment with vertices that are transformed by one or more bones and can be deformed by a slot's
* {@link Slot#getAttachmentVertices()}. */
public class VertexAttachment extends Attachment {
static private final AtomicInteger nextID = new AtomicInteger();
private final int id = (nextID.getAndIncrement() & 65535) << 11;
int[] bones;
float[] vertices;
int worldVerticesLength;
public VertexAttachment (String name) {
super(name);
}
/** Transforms the attachment's local {@link #getVertices()} to world coordinates. If the slot has
* {@link Slot#getAttachmentVertices()}, they are used to deform the vertices.
*
* See World transforms in the Spine
* Runtimes Guide.
* @param start The index of the first {@link #getVertices()} value to transform. Each vertex has 2 values, x and y.
* @param count The number of world vertex values to output. Must be <= {@link #getWorldVerticesLength()} - start.
* @param worldVertices The output world vertices. Must have a length >= offset + count *
* stride / 2.
* @param offset The worldVertices index to begin writing values.
* @param stride The number of worldVertices entries between the value pairs written. */
public void computeWorldVertices (Slot slot, int start, int count, float[] worldVertices, int offset, int stride) {
count = offset + (count >> 1) * stride;
Skeleton skeleton = slot.getSkeleton();
FloatArray deformArray = slot.getAttachmentVertices();
float[] vertices = this.vertices;
int[] bones = this.bones;
if (bones == null) {
if (deformArray.size > 0) vertices = deformArray.items;
Bone bone = slot.getBone();
float x = bone.getWorldX(), y = bone.getWorldY();
float a = bone.getA(), b = bone.getB(), c = bone.getC(), d = bone.getD();
for (int v = start, w = offset; w < count; v += 2, w += stride) {
float vx = vertices[v], vy = vertices[v + 1];
worldVertices[w] = vx * a + vy * b + x;
worldVertices[w + 1] = vx * c + vy * d + y;
}
return;
}
int v = 0, skip = 0;
for (int i = 0; i < start; i += 2) {
int n = bones[v];
v += n + 1;
skip += n;
}
Object[] skeletonBones = skeleton.getBones().items;
if (deformArray.size == 0) {
for (int w = offset, b = skip * 3; w < count; w += stride) {
float wx = 0, wy = 0;
int n = bones[v++];
n += v;
for (; v < n; v++, b += 3) {
Bone bone = (Bone)skeletonBones[bones[v]];
float vx = vertices[b], vy = vertices[b + 1], weight = vertices[b + 2];
wx += (vx * bone.getA() + vy * bone.getB() + bone.getWorldX()) * weight;
wy += (vx * bone.getC() + vy * bone.getD() + bone.getWorldY()) * weight;
}
worldVertices[w] = wx;
worldVertices[w + 1] = wy;
}
} else {
float[] deform = deformArray.items;
for (int w = offset, b = skip * 3, f = skip << 1; w < count; w += stride) {
float wx = 0, wy = 0;
int n = bones[v++];
n += v;
for (; v < n; v++, b += 3, f += 2) {
Bone bone = (Bone)skeletonBones[bones[v]];
float vx = vertices[b] + deform[f], vy = vertices[b + 1] + deform[f + 1], weight = vertices[b + 2];
wx += (vx * bone.getA() + vy * bone.getB() + bone.getWorldX()) * weight;
wy += (vx * bone.getC() + vy * bone.getD() + bone.getWorldY()) * weight;
}
worldVertices[w] = wx;
worldVertices[w + 1] = wy;
}
}
}
/** Returns true if a deform originally applied to the specified attachment should be applied to this attachment. The default
* implementation returns true only when sourceAttachment is this attachment. */
public boolean applyDeform (VertexAttachment sourceAttachment) {
return this == sourceAttachment;
}
/** The bones which affect the {@link #getVertices()}. The array entries are, for each vertex, the number of bones affecting
* the vertex followed by that many bone indices, which is the index of the bone in {@link Skeleton#getBones()}. Will be null
* if this attachment has no weights. */
public int[] getBones () {
return bones;
}
/** @param bones May be null if this attachment has no weights. */
public void setBones (int[] bones) {
this.bones = bones;
}
/** The vertex positions in the bone's coordinate system. For a non-weighted attachment, the values are x,y
* entries for each vertex. For a weighted attachment, the values are x,y,weight entries for each bone affecting
* each vertex. */
public float[] getVertices () {
return vertices;
}
public void setVertices (float[] vertices) {
this.vertices = vertices;
}
/** The maximum number of world vertex values that can be output by
* {@link #computeWorldVertices(Slot, int, int, float[], int, int)} using the count parameter. */
public int getWorldVerticesLength () {
return worldVerticesLength;
}
public void setWorldVerticesLength (int worldVerticesLength) {
this.worldVerticesLength = worldVerticesLength;
}
/** Returns a unique ID for this attachment. */
public int getId () {
return id;
}
}