supportsElapsed = currentContext->hasExtension("GL_EXT_timer_query") || supportsTimestamp;
supportsOcclusion = currentContext->hasExtension("GL_ARB_occlusion_query");
supportsDebugOutput = currentContext->hasExtension("GL_ARB_debug_output");
supportsElapsed = currentContext->hasExtension("GL_EXT_timer_query") || supportsTimestamp;
supportsOcclusion = currentContext->hasExtension("GL_ARB_occlusion_query");
supportsDebugOutput = currentContext->hasExtension("GL_ARB_debug_output");