gDEBugger, an OpenGL debugger and profiler, traces application activity on top of the OpenGL API letting programmers see what is happening within the graphic system implementation. The new v1.5 introduces a Shader Viewer that displays a list of shading programs and shaders existing in each render context. This viewer displays each shader's source code and parameters. Also displayed is a list of each program’s attached shaders, active uniforms values and program parameters. In addition, this version supports multithreaded applications, displaying a list of the debugged process threads and thread current render contexts. The Call Stack View now displays the call stack of any chosen thread.