reenable FPS display

src/common/detail/clglcontext.cpp

@@ -78,7 +78,7 @@ void CLGLContext::begin() {
 
 void CLGLContext::end() {
     GL_CHECK(glBindTexture(GL_TEXTURE_2D, 0));
-    GL_CHECK(glFramebufferRenderbuffer(GL_FRAMEBUFFER, GL_DEPTH_STENCIL_ATTACHMENT, GL_RENDERBUFFER, 0));
+//    GL_CHECK(glFramebufferRenderbuffer(GL_FRAMEBUFFER, GL_DEPTH_STENCIL_ATTACHMENT, GL_RENDERBUFFER, 0));
     GL_CHECK(glBindRenderbuffer(GL_RENDERBUFFER, 0));
     GL_CHECK(glBindFramebuffer(GL_FRAMEBUFFER, 0));
     //glFlush seems enough but i wanna make sure that there won't be race conditions.

src/common/util.hpp

@@ -9,6 +9,7 @@
 
 namespace kb {
 namespace viz2d {
+class Viz2D;
 
 void gl_check_error(const std::filesystem::path &file, unsigned int line, const char *expression);