1 files changed, 42 insertions, 0 deletions
diff --git a/make/config/jogl/gl-impl-CustomJavaCode-embedded.java b/make/config/jogl/gl-impl-CustomJavaCode-embedded.java
new file mode 100644
index 000000000..0408c21a1
--- /dev/null
+++ b/make/config/jogl/gl-impl-CustomJavaCode-embedded.java
@@ -0,0 +1,42 @@
+private int[] imageSizeTemp = new int[1];
+
+/** Helper for more precise computation of number of bytes that will
+    be touched by a pixel pack or unpack operation. */
+private int imageSizeInBytes(int bytesPerElement,
+                             int rowLength, int imageHeight, int depth, boolean pack) {
+    int alignment = 1;
+
+    if (pack) {
+        glGetIntegerv(GL_PACK_ALIGNMENT, imageSizeTemp, 0);
+        alignment = imageSizeTemp[0];
+    } else {
+        glGetIntegerv(GL_UNPACK_ALIGNMENT, imageSizeTemp, 0);
+        alignment = imageSizeTemp[0];
+    }
+    // Try to deal somewhat correctly with potentially invalid values
+    rowLength   = Math.max(0, rowLength );
+    imageHeight = Math.max(1, imageHeight); // min 1D
+    depth       = Math.max(1, depth );      // min 1 * imageSize
+    alignment   = Math.max(1, alignment);
+
+    int rowLengthInBytes = rowLength * bytesPerElement;
+
+    if (alignment > 1) {
+        int padding = rowLengthInBytes % alignment;
+        if (padding > 0) {
+            rowLengthInBytes += alignment - padding;
+        }
+    }
+
+    /**
+     * depth is in multiples of image size.
+     *
+     * rowlenght is the actual repeating offset 
+     * to go from line n to line n+1 at the same x-axis position.
+     */
+    return 
+        ( depth       - 1 ) * imageHeight * rowLengthInBytes + // whole images
+        ( imageHeight - 1 ) * rowLengthInBytes +               // lines with padding
+        ( rowLength       ) * bytesPerElement;                 // last line
+}
+