Debug FPS display with rendering backend info

src/platform.rs

@@ -35,6 +35,7 @@ mod imp {
         fn dc_ws_send(id: i32, p: *const u8, pl: u32) -> i32;
         fn dc_ws_take(id: i32) -> i32;
         fn dc_ws_close(id: i32);
+        fn dc_renderer() -> i32;
     }
 
     // starts a request; poll the returned id with http_poll()
@@ -171,6 +172,18 @@ mod imp {
             unsafe { dc_ws_close(id) }
         }
     }
+
+    pub fn renderer() -> String {
+        unsafe {
+            let n = dc_renderer();
+            if n < 0 {
+                return String::new();
+            }
+            let mut buf = vec![0u8; n as usize];
+            dc_storage_take(buf.as_mut_ptr());
+            String::from_utf8(buf).unwrap_or_default()
+        }
+    }
 }
 
 #[cfg(not(target_arch = "wasm32"))]
@@ -233,6 +246,21 @@ mod imp {
         None
     }
     pub fn ws_close(_id: i32) {}
+
+    pub fn renderer() -> String {
+        #[cfg(target_vendor = "apple")]
+        {
+            use macroquad::miniquad::conf::AppleGfxApi;
+            return match macroquad::miniquad::window::apple_gfx_api() {
+                AppleGfxApi::Metal => "Metal".into(),
+                AppleGfxApi::OpenGl => "OpenGL".into(),
+            };
+        }
+        #[cfg(not(target_vendor = "apple"))]
+        {
+            return "OpenGL".into();
+        }
+    }
 }
 
 pub use imp::*;