1 files changed, 37 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..2d4cd1372
--- /dev/null
+++ b/make/config/jogl/gl-impl-CustomJavaCode-embedded.java
@@ -0,0 +1,37 @@
+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 w, int h, int d,
+                             int dimensions,
+                             boolean pack) {
+    int rowLength = w;
+    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);
+    alignment   = Math.max(1, alignment);
+    h           = Math.max(0, h);
+    int rowLengthInBytes = rowLength * bytesPerElement;
+    if (alignment > 1) {
+        int modulus = rowLengthInBytes % alignment;
+        if (modulus > 0) {
+            rowLengthInBytes += alignment - modulus;
+        }
+    }
+
+    int size = 0;
+    if (dimensions == 1) {
+        return rowLengthInBytes;
+    } else {
+        return h * rowLengthInBytes;
+    }
+}