From 23900a050707dc47b2c0217bebaf931a913c674f Mon Sep 17 00:00:00 2001
From: Sam Lantinga <slouken@libsdl.org>
Date: Sat, 26 Sep 2009 10:17:49 +0000
Subject: [PATCH] Fixed bug #764

Added better error checking from Mason Wheeler
---
 src/video/SDL_video.c | 12 +++++++++---
 1 file changed, 9 insertions(+), 3 deletions(-)

diff --git a/src/video/SDL_video.c b/src/video/SDL_video.c
index def87b5eb..f8fe0662f 100644
--- a/src/video/SDL_video.c
+++ b/src/video/SDL_video.c
@@ -2417,11 +2417,17 @@ SDL_RenderCopy(SDL_TextureID textureID, const SDL_Rect * srcrect,
     SDL_Rect real_srcrect;
     SDL_Rect real_dstrect;
 
-    if (!texture || texture->renderer != SDL_CurrentDisplay.current_renderer) {
-        return -1;
-    }
     renderer = SDL_CurrentDisplay.current_renderer;
     if (!renderer) {
+        SDL_SetError("No current renderer available");
+        return -1;
+    }
+    if (!texture) {
+        SDL_SetError("Texture not found");
+        return -1;
+    }
+    if (texture->renderer != renderer) {
+        SDL_SetError("Texture was not created with this renderer");
         return -1;
     }
     if (!renderer->RenderCopy) {