From 584df5518b8de0ed750ce936fd2ccce461ab2ee4 Mon Sep 17 00:00:00 2001
From: Alula <6276139+alula@users.noreply.github.com>
Date: Sun, 27 Jun 2021 03:29:48 +0200
Subject: [PATCH] fix an imgui rendering issue on sdl2 backend

---
 src/framework/backend_sdl2.rs | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/src/framework/backend_sdl2.rs b/src/framework/backend_sdl2.rs
index a5b1316..3fd5942 100644
--- a/src/framework/backend_sdl2.rs
+++ b/src/framework/backend_sdl2.rs
@@ -377,6 +377,7 @@ impl BackendRenderer for SDL2Renderer {
         let mut refs = self.refs.borrow_mut();
 
         refs.canvas.set_draw_color(to_sdl(color));
+        refs.canvas.set_blend_mode(sdl2::render::BlendMode::Blend);
         refs.canvas.clear();
     }
 
@@ -388,6 +389,15 @@ impl BackendRenderer for SDL2Renderer {
         Ok(())
     }
 
+    fn prepare_draw(&mut self, width: f32, height: f32) -> GameResult {
+        let mut refs = self.refs.borrow_mut();
+
+        refs.canvas.set_clip_rect(Some(sdl2::rect::Rect::new(0, 0, width as u32, height as u32, )));
+        //refs.canvas.set_clip_rect(None);
+
+        Ok(())
+    }
+
     fn create_texture_mutable(&mut self, width: u16, height: u16) -> GameResult<Box<dyn BackendTexture>> {
         let refs = self.refs.borrow_mut();