mirror of
https://github.com/EsotericSoftware/spine-runtimes.git
synced 2026-02-09 16:48:43 +08:00
396 lines
14 KiB
Java
396 lines
14 KiB
Java
/******************************************************************************
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* Spine Runtimes License Agreement
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* Last updated July 28, 2023. Replaces all prior versions.
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*
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* Copyright (c) 2013-2023, Esoteric Software LLC
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*
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* Integration of the Spine Runtimes into software or otherwise creating
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* derivative works of the Spine Runtimes is permitted under the terms and
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* conditions of Section 2 of the Spine Editor License Agreement:
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* http://esotericsoftware.com/spine-editor-license
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*
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* Otherwise, it is permitted to integrate the Spine Runtimes into software or
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* otherwise create derivative works of the Spine Runtimes (collectively,
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* "Products"), provided that each user of the Products must obtain their own
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* Spine Editor license and redistribution of the Products in any form must
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* include this license and copyright notice.
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*
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* THE SPINE RUNTIMES ARE PROVIDED BY ESOTERIC SOFTWARE LLC "AS IS" AND ANY
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* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL ESOTERIC SOFTWARE LLC BE LIABLE FOR ANY
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* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES,
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* BUSINESS INTERRUPTION, OR LOSS OF USE, DATA, OR PROFITS) HOWEVER CAUSED AND
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* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THE
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* SPINE RUNTIMES, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*****************************************************************************/
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package com.esotericsoftware.spine.utils;
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import com.badlogic.gdx.utils.Array;
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import com.badlogic.gdx.utils.FloatArray;
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import com.badlogic.gdx.utils.ShortArray;
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import com.esotericsoftware.spine.Slot;
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import com.esotericsoftware.spine.attachments.ClippingAttachment;
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public class SkeletonClipping {
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private final Triangulator triangulator = new Triangulator();
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private final FloatArray clippingPolygon = new FloatArray();
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private final FloatArray clipOutput = new FloatArray(128);
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private final FloatArray clippedVertices = new FloatArray(128);
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private final ShortArray clippedTriangles = new ShortArray(128);
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private final FloatArray scratch = new FloatArray();
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private ClippingAttachment clipAttachment;
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private Array<FloatArray> clippingPolygons;
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public void clipStart (Slot slot, ClippingAttachment clip) {
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if (clipAttachment != null) return;
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int n = clip.getWorldVerticesLength();
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if (n < 6) return;
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clipAttachment = clip;
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float[] vertices = clippingPolygon.setSize(n);
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clip.computeWorldVertices(slot, 0, n, vertices, 0, 2);
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makeClockwise(clippingPolygon);
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ShortArray triangles = triangulator.triangulate(clippingPolygon);
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clippingPolygons = triangulator.decompose(clippingPolygon, triangles);
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for (FloatArray polygon : clippingPolygons) {
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makeClockwise(polygon);
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polygon.add(polygon.items[0]);
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polygon.add(polygon.items[1]);
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}
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}
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public void clipEnd (Slot slot) {
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if (clipAttachment != null && clipAttachment.getEndSlot() == slot.getData()) clipEnd();
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}
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public void clipEnd () {
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if (clipAttachment == null) return;
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clipAttachment = null;
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clippingPolygons = null;
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clippedVertices.clear();
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clippedTriangles.clear();
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clippingPolygon.clear();
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}
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public boolean isClipping () {
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return clipAttachment != null;
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}
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public void clipTriangles (float[] vertices, short[] triangles, int trianglesLength) {
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FloatArray clipOutput = this.clipOutput, clippedVertices = this.clippedVertices;
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ShortArray clippedTriangles = this.clippedTriangles;
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Object[] polygons = clippingPolygons.items;
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int polygonsCount = clippingPolygons.size;
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short index = 0;
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clippedVertices.clear();
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clippedTriangles.clear();
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for (int i = 0; i < trianglesLength; i += 3) {
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int vertexOffset = triangles[i] << 1;
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float x1 = vertices[vertexOffset], y1 = vertices[vertexOffset + 1];
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vertexOffset = triangles[i + 1] << 1;
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float x2 = vertices[vertexOffset], y2 = vertices[vertexOffset + 1];
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vertexOffset = triangles[i + 2] << 1;
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float x3 = vertices[vertexOffset], y3 = vertices[vertexOffset + 1];
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for (int p = 0; p < polygonsCount; p++) {
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int s = clippedVertices.size;
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if (clip(x1, y1, x2, y2, x3, y3, (FloatArray)polygons[p], clipOutput)) {
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int clipOutputLength = clipOutput.size;
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if (clipOutputLength == 0) continue;
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int clipOutputCount = clipOutputLength >> 1;
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float[] clipOutputItems = clipOutput.items;
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float[] clippedVerticesItems = clippedVertices.setSize(s + clipOutputCount * 2);
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for (int ii = 0; ii < clipOutputLength; ii += 2, s += 2) {
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float x = clipOutputItems[ii], y = clipOutputItems[ii + 1];
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clippedVerticesItems[s] = x;
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clippedVerticesItems[s + 1] = y;
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}
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s = clippedTriangles.size;
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short[] clippedTrianglesItems = clippedTriangles.setSize(s + 3 * (clipOutputCount - 2));
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clipOutputCount--;
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for (int ii = 1; ii < clipOutputCount; ii++, s += 3) {
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clippedTrianglesItems[s] = index;
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clippedTrianglesItems[s + 1] = (short)(index + ii);
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clippedTrianglesItems[s + 2] = (short)(index + ii + 1);
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}
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index += clipOutputCount + 1;
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} else {
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float[] clippedVerticesItems = clippedVertices.setSize(s + 3 * 2);
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clippedVerticesItems[s] = x1;
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clippedVerticesItems[s + 1] = y1;
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clippedVerticesItems[s + 2] = x2;
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clippedVerticesItems[s + 3] = y2;
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clippedVerticesItems[s + 4] = x3;
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clippedVerticesItems[s + 5] = y3;
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s = clippedTriangles.size;
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short[] clippedTrianglesItems = clippedTriangles.setSize(s + 3);
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clippedTrianglesItems[s] = index;
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clippedTrianglesItems[s + 1] = (short)(index + 1);
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clippedTrianglesItems[s + 2] = (short)(index + 2);
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index += 3;
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break;
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}
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}
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}
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}
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public void clipTriangles (float[] vertices, short[] triangles, int trianglesLength, float[] uvs, float light, float dark,
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boolean twoColor) {
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FloatArray clipOutput = this.clipOutput, clippedVertices = this.clippedVertices;
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ShortArray clippedTriangles = this.clippedTriangles;
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Object[] polygons = clippingPolygons.items;
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int polygonsCount = clippingPolygons.size;
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int vertexSize = twoColor ? 6 : 5;
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short index = 0;
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clippedVertices.clear();
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clippedTriangles.clear();
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for (int i = 0; i < trianglesLength; i += 3) {
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int vertexOffset = triangles[i] << 1;
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float x1 = vertices[vertexOffset], y1 = vertices[vertexOffset + 1];
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float u1 = uvs[vertexOffset], v1 = uvs[vertexOffset + 1];
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vertexOffset = triangles[i + 1] << 1;
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float x2 = vertices[vertexOffset], y2 = vertices[vertexOffset + 1];
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float u2 = uvs[vertexOffset], v2 = uvs[vertexOffset + 1];
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vertexOffset = triangles[i + 2] << 1;
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float x3 = vertices[vertexOffset], y3 = vertices[vertexOffset + 1];
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float u3 = uvs[vertexOffset], v3 = uvs[vertexOffset + 1];
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for (int p = 0; p < polygonsCount; p++) {
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int s = clippedVertices.size;
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if (clip(x1, y1, x2, y2, x3, y3, (FloatArray)polygons[p], clipOutput)) {
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int clipOutputLength = clipOutput.size;
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if (clipOutputLength == 0) continue;
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float d0 = y2 - y3, d1 = x3 - x2, d2 = x1 - x3, d4 = y3 - y1;
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float d = 1 / (d0 * d2 + d1 * (y1 - y3));
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int clipOutputCount = clipOutputLength >> 1;
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float[] clipOutputItems = clipOutput.items;
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float[] clippedVerticesItems = clippedVertices.setSize(s + clipOutputCount * vertexSize);
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for (int ii = 0; ii < clipOutputLength; ii += 2, s += 2) {
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float x = clipOutputItems[ii], y = clipOutputItems[ii + 1];
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clippedVerticesItems[s] = x;
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clippedVerticesItems[s + 1] = y;
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clippedVerticesItems[s + 2] = light;
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if (twoColor) {
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clippedVerticesItems[s + 3] = dark;
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s += 4;
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} else
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s += 3;
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float c0 = x - x3, c1 = y - y3;
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float a = (d0 * c0 + d1 * c1) * d;
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float b = (d4 * c0 + d2 * c1) * d;
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float c = 1 - a - b;
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clippedVerticesItems[s] = u1 * a + u2 * b + u3 * c;
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clippedVerticesItems[s + 1] = v1 * a + v2 * b + v3 * c;
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}
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s = clippedTriangles.size;
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short[] clippedTrianglesItems = clippedTriangles.setSize(s + 3 * (clipOutputCount - 2));
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clipOutputCount--;
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for (int ii = 1; ii < clipOutputCount; ii++, s += 3) {
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clippedTrianglesItems[s] = index;
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clippedTrianglesItems[s + 1] = (short)(index + ii);
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clippedTrianglesItems[s + 2] = (short)(index + ii + 1);
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}
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index += clipOutputCount + 1;
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} else {
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float[] clippedVerticesItems = clippedVertices.setSize(s + 3 * vertexSize);
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clippedVerticesItems[s] = x1;
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clippedVerticesItems[s + 1] = y1;
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clippedVerticesItems[s + 2] = light;
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if (!twoColor) {
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clippedVerticesItems[s + 3] = u1;
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clippedVerticesItems[s + 4] = v1;
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clippedVerticesItems[s + 5] = x2;
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clippedVerticesItems[s + 6] = y2;
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clippedVerticesItems[s + 7] = light;
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clippedVerticesItems[s + 8] = u2;
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clippedVerticesItems[s + 9] = v2;
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clippedVerticesItems[s + 10] = x3;
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clippedVerticesItems[s + 11] = y3;
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clippedVerticesItems[s + 12] = light;
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clippedVerticesItems[s + 13] = u3;
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clippedVerticesItems[s + 14] = v3;
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} else {
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clippedVerticesItems[s + 3] = dark;
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clippedVerticesItems[s + 4] = u1;
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clippedVerticesItems[s + 5] = v1;
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clippedVerticesItems[s + 6] = x2;
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clippedVerticesItems[s + 7] = y2;
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clippedVerticesItems[s + 8] = light;
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clippedVerticesItems[s + 9] = dark;
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clippedVerticesItems[s + 10] = u2;
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clippedVerticesItems[s + 11] = v2;
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clippedVerticesItems[s + 12] = x3;
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clippedVerticesItems[s + 13] = y3;
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clippedVerticesItems[s + 14] = light;
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clippedVerticesItems[s + 15] = dark;
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clippedVerticesItems[s + 16] = u3;
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clippedVerticesItems[s + 17] = v3;
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}
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s = clippedTriangles.size;
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short[] clippedTrianglesItems = clippedTriangles.setSize(s + 3);
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clippedTrianglesItems[s] = index;
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clippedTrianglesItems[s + 1] = (short)(index + 1);
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clippedTrianglesItems[s + 2] = (short)(index + 2);
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index += 3;
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break;
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}
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}
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}
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}
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/** Clips the input triangle against the convex, clockwise clipping area. If the triangle lies entirely within the clipping
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* area, false is returned. The clipping area must duplicate the first vertex at the end of the vertices list. */
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boolean clip (float x1, float y1, float x2, float y2, float x3, float y3, FloatArray clippingArea, FloatArray output) {
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FloatArray originalOutput = output;
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boolean clipped = false;
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// Avoid copy at the end.
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FloatArray input = null;
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if (clippingArea.size % 4 >= 2) {
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input = output;
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output = scratch;
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} else
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input = scratch;
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input.clear();
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input.add(x1);
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input.add(y1);
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input.add(x2);
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input.add(y2);
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input.add(x3);
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input.add(y3);
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input.add(x1);
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input.add(y1);
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output.clear();
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float[] clippingVertices = clippingArea.items;
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int clippingVerticesLast = clippingArea.size - 4;
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for (int i = 0;; i += 2) {
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float edgeX = clippingVertices[i], edgeY = clippingVertices[i + 1];
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float edgeX2 = clippingVertices[i + 2], edgeY2 = clippingVertices[i + 3];
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float deltaX = edgeX - edgeX2, deltaY = edgeY - edgeY2;
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float[] inputVertices = input.items;
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int inputVerticesLength = input.size - 2, outputStart = output.size;
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for (int ii = 0; ii < inputVerticesLength; ii += 2) {
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float inputX = inputVertices[ii], inputY = inputVertices[ii + 1];
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float inputX2 = inputVertices[ii + 2], inputY2 = inputVertices[ii + 3];
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boolean side2 = deltaX * (inputY2 - edgeY2) - deltaY * (inputX2 - edgeX2) > 0;
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if (deltaX * (inputY - edgeY2) - deltaY * (inputX - edgeX2) > 0) {
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if (side2) { // v1 inside, v2 inside
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output.add(inputX2);
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output.add(inputY2);
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continue;
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}
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// v1 inside, v2 outside
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float c0 = inputY2 - inputY, c2 = inputX2 - inputX;
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float s = c0 * (edgeX2 - edgeX) - c2 * (edgeY2 - edgeY);
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if (Math.abs(s) > 0.000001f) {
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float ua = (c2 * (edgeY - inputY) - c0 * (edgeX - inputX)) / s;
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output.add(edgeX + (edgeX2 - edgeX) * ua);
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output.add(edgeY + (edgeY2 - edgeY) * ua);
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} else {
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output.add(edgeX);
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output.add(edgeY);
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}
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} else if (side2) { // v1 outside, v2 inside
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float c0 = inputY2 - inputY, c2 = inputX2 - inputX;
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float s = c0 * (edgeX2 - edgeX) - c2 * (edgeY2 - edgeY);
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if (Math.abs(s) > 0.000001f) {
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float ua = (c2 * (edgeY - inputY) - c0 * (edgeX - inputX)) / s;
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output.add(edgeX + (edgeX2 - edgeX) * ua);
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output.add(edgeY + (edgeY2 - edgeY) * ua);
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} else {
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output.add(edgeX);
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output.add(edgeY);
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}
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output.add(inputX2);
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output.add(inputY2);
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}
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clipped = true;
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}
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if (outputStart == output.size) { // All edges outside.
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originalOutput.clear();
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return true;
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}
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output.add(output.items[0]);
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output.add(output.items[1]);
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if (i == clippingVerticesLast) break;
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FloatArray temp = output;
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output = input;
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output.clear();
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input = temp;
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}
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if (originalOutput != output) {
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originalOutput.clear();
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originalOutput.addAll(output.items, 0, output.size - 2);
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} else
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originalOutput.setSize(originalOutput.size - 2);
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return clipped;
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}
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public FloatArray getClippedVertices () {
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return clippedVertices;
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}
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public ShortArray getClippedTriangles () {
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return clippedTriangles;
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}
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static void makeClockwise (FloatArray polygon) {
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float[] vertices = polygon.items;
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int verticeslength = polygon.size;
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float area = vertices[verticeslength - 2] * vertices[1] - vertices[0] * vertices[verticeslength - 1], p1x, p1y, p2x, p2y;
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for (int i = 0, n = verticeslength - 3; i < n; i += 2) {
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p1x = vertices[i];
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p1y = vertices[i + 1];
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p2x = vertices[i + 2];
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p2y = vertices[i + 3];
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area += p1x * p2y - p2x * p1y;
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}
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if (area < 0) return;
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for (int i = 0, lastX = verticeslength - 2, n = verticeslength >> 1; i < n; i += 2) {
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float x = vertices[i], y = vertices[i + 1];
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int other = lastX - i;
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vertices[i] = vertices[other];
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vertices[i + 1] = vertices[other + 1];
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vertices[other] = x;
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vertices[other + 1] = y;
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}
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}
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}
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