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Using short indices on android and desktop

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codeanticode
2012-03-31 15:16:27 +00:00
parent 1a05916a50
commit 67c0d5e9e4
5 changed files with 62 additions and 34 deletions
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18
android/core/src/processing/opengl/PGL.java
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@@ -31,6 +31,7 @@ import java.nio.IntBuffer;
import java.util.Arrays;
import processing.core.PApplet;
import processing.core.PGraphics;
import processing.opengl.tess.PGLU;
import processing.opengl.tess.PGLUtessellator;
import processing.opengl.tess.PGLUtessellatorCallbackAdapter;
@@ -81,9 +82,10 @@ public class PGL {
public static final int MAX_LIGHTS = 8;
/** Maximum number of tessellated vertices. GLES restricts the vertex indices
* to be of type short, so 2^16 = 65536 is the maximum possible number of
* vertices that can be referred to within a single VBO. */
public static final int MAX_TESS_VERTICES = 65536;
* to be of type unsigned short. Since Java only supports native shorts as
* primitive type we have 2^15 = 32768 as the maximum number of vertices
* that can be referred to within a single VBO. */
public static final int MAX_TESS_VERTICES = 32768;
/** Maximum number of indices. 2 times the max number of
* vertices to have good room for vertex reuse. */
@@ -1184,12 +1186,20 @@ public class PGL {
static public short makeIndex(int intIdx) {
// The old hack to have unsigned shorts as indices using Java's
// signed shorts:
// When the index value is greater than 32767, subtracting 65536
// will make it (as a short) to wrap around to the negative range, which
// is all we need to later pass these numbers to opengl (which will
// interpret them as unsigned shorts). See discussion here:
// http://stackoverflow.com/questions/4331021/java-opengl-gldrawelements-with-32767-vertices
return 32767 < intIdx ? (short)(intIdx - 65536) : (short)intIdx;
//return 32767 < intIdx ? (short)(intIdx - 65536) : (short)intIdx;
if (32767 < intIdx) {
PGraphics.showWarning("P3D: Vertex index is greater than 32767");
return 32767;
} else {
return (short)intIdx;
}
}