Core: Add core_time_now() and core_time_since_start()

Author: juniorrantila

Libraries/Core/Time.cpp

@@ -12,3 +12,17 @@ f64 time(void)
 }
 
 }
+
+C_API f64 core_time_now()
+{
+    return Core::time();
+}
+
+C_API f64 core_time_since_start()
+{
+    static f64 start;
+    if (start == 0.0) {
+        start = core_time_now();
+    }
+    return core_time_now() - start;
+}

Libraries/Core/Time.h

@@ -33,3 +33,6 @@ auto benchmark(F callback)
 }
 
 }
+
+C_API f64 core_time_now();
+C_API f64 core_time_since_start();

Tools/shadertoy.cpp

@@ -112,7 +112,6 @@ ErrorOr<int> Main::main(int argc, char const* argv[])
     auto ratio = ui_window_pixel_ratio(window);
     render_set_resolution(render, size * ratio);
 
-    auto begin = Core::time();
     while (!ui_window_should_close(window)) {
         ui_application_poll_events(app);
 
@@ -125,8 +124,8 @@ ErrorOr<int> Main::main(int argc, char const* argv[])
             else log->warning("could not reload shaders");
         }
 
-        render_set_time(render, (f32)(Core::time() - begin));
         ui_window_gl_make_current_context(window);
+        render_set_time(render, core_time_since_start());
         ui_frame(&context);
         render_flush(render);
         ui_window_gl_flush(window);