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avoid copy - pin coordinate buffer for triangulation

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This commit is contained in:
Hannes Janetzek
2013-03-16 03:56:17 +01:00
parent f2bbc51558
commit 22441bf527
3 changed files with 110 additions and 132 deletions
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31
src/org/oscim/renderer/layer/ExtrusionLayer.java
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@@ -16,11 +16,9 @@ package org.oscim.renderer.layer;
import java.nio.ByteBuffer;
import java.nio.ByteOrder;
import java.nio.FloatBuffer;
import java.nio.ShortBuffer;
import org.oscim.core.Tile;
import org.oscim.jni.TriangleJNI;
import org.oscim.renderer.BufferObject;
import org.oscim.renderer.GLRenderer;
import org.oscim.utils.LineClipper;
@@ -414,31 +412,22 @@ public class ExtrusionLayer extends Layer {
private static boolean initialized = false;
private static ShortBuffer sBuf;
private static FloatBuffer fBuf;
public static synchronized int triangulate(float[] points, int ppos, int plen, short[] index,
int ipos, int rings, int vertexOffset, VertexPoolItem item) {
if (!initialized) {
// FIXME also cleanup on shutdown!
fBuf = ByteBuffer.allocateDirect(1200 * 4).order(ByteOrder.nativeOrder())
.asFloatBuffer();
sBuf = ByteBuffer.allocateDirect(1800 * 2).order(ByteOrder.nativeOrder())
.asShortBuffer();
initialized = true;
}
fBuf.clear();
fBuf.put(points, ppos, plen);
sBuf.clear();
sBuf.put((short) plen); // all points
sBuf.put(index, ipos, rings);
int numTris = TriangleJNI.triangulate(fBuf, rings, sBuf, vertexOffset);
int numTris = triangulate(points, ppos, plen, rings, sBuf, vertexOffset);
int numIndices = numTris * 3;
sBuf.limit(numIndices);
@@ -462,4 +451,22 @@ public class ExtrusionLayer extends Layer {
return numIndices;
}
/**
* @param points an array of x,y coordinates
* @param pos position in points array
* @param len number of points * 2 (i.e. values to read)
* @param numRings number of rings in polygon == outer(1) + inner rings
* @param io input: number of points in rings - times 2!
* output: indices of triangles, 3 per triangle :) (indices use
* stride=2, i.e. 0,2,4...)
* @param ioffset offset used to add offset to indices
* @return number of triangles in io buffer
*/
public static native int triangulate(float[] points, int pos, int len, int numRings, ShortBuffer io,
int ioffset);
static {
System.loadLibrary("triangle-jni");
}
}