Based on OpenGL ES documentation I see that glBlendColor function should be available but they aren't in Jogl using GLES1. Related docs: http://www.khronos.org/opengles/sdk/docs/man/xhtml/glBlendColor.xml
http://www.khronos.org/opengles/sdk/1.1/docs/man/ http://www.khronos.org/registry/gles/specs/1.1/es_full_spec_1.1.12.pdf there is no such function avail in ES1.