Texture ctor w/ external textureID: Pass `ownsTextureID` where true hands over ownership and allows destroy() to delete it, otherwise not. Fixes GraphUI's GLButton.

GraphUI's GLButton uses the offscreen's FBO texture and hence can't pass over ownership of the texture.
Hence the Texture instance is created w/o handing over ownership!

GLMediaPlayerImpl does hand over ownership of the generated and passed texture to the Texture ctor.

1 files changed, 28 insertions, 10 deletions

diff --git a/src/jogl/classes/com/jogamp/opengl/util/texture/Texture.java b/src/jogl/classes/com/jogamp/opengl/util/texture/Texture.java
index 5868e1b52..2af971b48 100644
--- a/src/jogl/classes/com/jogamp/opengl/util/texture/Texture.java
+++ b/src/jogl/classes/com/jogamp/opengl/util/texture/Texture.java
@@ -170,6 +170,8 @@ public class Texture {
     private int imageTarget;
     /** The GL texture ID. */
     private int texID;
+    /** Owning texture texID */
+    private final boolean ownsTextureID;
     /** The width of the texture. */
     private int texWidth;
     /** The height of the texture. */
@@ -211,6 +213,7 @@ public class Texture {
 
     public Texture(final GL gl, final TextureData data) throws GLException {
         this.texID = 0;
+        this.ownsTextureID = true;
         this.target = 0;
         this.imageTarget = 0;
         updateImage(gl, data);
@@ -224,6 +227,7 @@ public class Texture {
      */
     public Texture(final int target) {
         this.texID = 0;
+        this.ownsTextureID = true;
         this.target = target;
         this.imageTarget = target;
     }
@@ -235,7 +239,10 @@ public class Texture {
      * it. Attempts to update such textures' contents will yield
      * undefined results.
      *
-     * @param textureID the OpenGL texture object to wrap
+     * @param textureID the valid OpenGL texture object to wrap
+     * @param ownsTextureID pass {@code true} if this {@link Texture} instance takes ownership of {@code textureID} texture
+     *        and {@link GL#glDeleteTextures(int, int[], int) deletes the texture} at {@link #destroy(GL)}.
+     *        Otherwise, if {@code false}, {@code textureID} texture will not be {@link GL#glDeleteTextures(int, int[], int) deleted} at {@link #destroy(GL)}.
      * @param target the OpenGL texture target, eg GL.GL_TEXTURE_2D,
      *               GL2.GL_TEXTURE_RECTANGLE
      * @param texWidth the width of the texture in pixels
@@ -251,11 +258,13 @@ public class Texture {
      *                           in order to properly display the
      *                           texture
      */
-    public Texture(final int textureID, final int target,
+    public Texture(final int textureID, final boolean ownsTextureID,
+                   final int target,
                    final int texWidth, final int texHeight,
                    final int imgWidth, final int imgHeight,
                    final boolean mustFlipVertically) {
         this.texID = textureID;
+        this.ownsTextureID = ownsTextureID;
         this.target = target;
         this.imageTarget = target;
         this.mustFlipVertically = mustFlipVertically;
@@ -265,6 +274,9 @@ public class Texture {
         this.imgWidth = imgWidth;
         this.imgHeight = imgHeight;
         this.updateTexCoords();
+        if ( 0 == texID ) {
+            throw new GLException("External texture ID invalid: texID "+textureID);
+        }
     }
 
     /**
@@ -341,15 +353,16 @@ public class Texture {
     }
 
     /**
-     * Destroys the native resources used by this texture object.
+     * Destroys and {@code null}s the {@link #getTextureObject() underlying native texture} used by this {@link Texture} instance
+     * if {@link #ownsTexture() owned}, otherwise just {@code null}s the {@link #getTextureObject() underlying native texture}.
      *
      * @throws GLException if any OpenGL-related errors occurred
      */
     public void destroy(final GL gl) throws GLException {
-        if(0!=texID) {
+        if( 0 != texID && ownsTextureID ) {
             gl.glDeleteTextures(1, new int[] {texID}, 0);
-            texID = 0;
         }
+        texID = 0;
     }
 
     /**
@@ -939,9 +952,10 @@ public class Texture {
      * </p>
      * @see #getTextureObject(GL)
      */
-    public int getTextureObject() {
-        return texID;
-    }
+    public int getTextureObject() { return texID; }
+
+    /** Returns whether {@link #getTextureObject()} is owned by this {@link Texture} instance. */
+    public final boolean ownsTexture() { return ownsTextureID; }
 
     /** Returns an estimate of the amount of texture memory in bytes
         this Texture consumes. It should only be treated as an estimate;
@@ -1130,7 +1144,7 @@ public class Texture {
 
     private boolean validateTexID(final GL gl, final boolean throwException) {
         if( 0 == texID ) {
-            if( null != gl ) {
+            if( null != gl && ownsTextureID ) {
                 final int[] tmp = new int[1];
                 gl.glGenTextures(1, tmp, 0);
                 texID = tmp[0];
@@ -1138,7 +1152,11 @@ public class Texture {
                     throw new GLException("Create texture ID invalid: texID "+texID+", glerr 0x"+Integer.toHexString(gl.glGetError()));
                 }
             } else if ( throwException ) {
-                throw new GLException("No GL context given, can't create texture ID");
+                if( !ownsTextureID ) {
+                    throw new GLException("Invalid external texture ID");
+                } else {
+                    throw new GLException("No GL context given, can't create texture ID");
+                }
             }
         }
         return 0 != texID;