From 7ebf5fe39a7d6348fd6ca85e19900b40279880f2 Mon Sep 17 00:00:00 2001
From: Simon Heath <icefoxen@gmail.com>
Date: Tue, 11 Jul 2017 09:57:04 -0400
Subject: [PATCH] Made gl_set_swap_interval() take Into<SwapInterval>

---
 src/sdl2/video.rs | 15 +++++++++++++--
 1 file changed, 13 insertions(+), 2 deletions(-)

diff --git a/src/sdl2/video.rs b/src/sdl2/video.rs
index 497807d7..666063bb 100644
--- a/src/sdl2/video.rs
+++ b/src/sdl2/video.rs
@@ -541,6 +541,17 @@ pub enum SwapInterval {
     LateSwapTearing = -1,
 }
 
+impl From<i32> for SwapInterval {
+    fn from(i: i32) -> Self {
+        match i {
+            -1 => SwapInterval::LateSwapTearing,
+            0  => SwapInterval::Immediate,
+            1  => SwapInterval::VSync,
+            other => panic!("Invalid value for SwapInterval: {}; valid values are -1, 0, 1", other),
+        }
+    }
+}
+
 /// Represents the "shell" of a `Window`.
 ///
 /// You can set get and set many of the SDL_Window properties (i.e., border, size, `PixelFormat`, etc)
@@ -780,8 +791,8 @@ impl VideoSubsystem {
         }
     }
 
-    pub fn gl_set_swap_interval(&self, interval: SwapInterval) -> bool {
-        unsafe { ll::SDL_GL_SetSwapInterval(interval as c_int) == 0 }
+    pub fn gl_set_swap_interval<S: Into<SwapInterval>>(&self, interval: S) -> bool {
+        unsafe { ll::SDL_GL_SetSwapInterval(interval.into() as c_int) == 0 }
     }
 
     pub fn gl_get_swap_interval(&self) -> SwapInterval {