From ccb47ce92c2a06b7cfe0486c9ccb19f154bd8529 Mon Sep 17 00:00:00 2001
From: Sam Lantinga <slouken@libsdl.org>
Date: Sat, 26 Sep 2009 10:22:35 +0000
Subject: [PATCH] Fixed bug #766

 Mason Wheeler      2009-07-06 14:29:47 PDT

This adds some missing error reporting for SDL_SelectRenderer, and cleans up the logic a little bit.
---
 src/video/SDL_video.c | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/src/video/SDL_video.c b/src/video/SDL_video.c
index f8fe0662f..1f6be3891 100644
--- a/src/video/SDL_video.c
+++ b/src/video/SDL_video.c
@@ -1501,11 +1501,16 @@ SDL_SelectRenderer(SDL_WindowID windowID)
     SDL_Window *window = SDL_GetWindowFromID(windowID);
     SDL_Renderer *renderer;
 
-    if (!window || !window->renderer) {
+    if (!window) {
+        SDL_SetError("Invalid window ID");
         return -1;
     }
     renderer = window->renderer;
-    if (renderer && renderer->ActivateRenderer) {
+    if (!renderer) {
+        SDL_SetError("Renderer hasn't been created yet");
+        return -1;
+    }
+    if (renderer->ActivateRenderer) {
         if (renderer->ActivateRenderer(renderer) < 0) {
             return -1;
         }