From 0674f2d28dd3539f09f60e40d10d45e683e5aca4 Mon Sep 17 00:00:00 2001
From: King_DuckZ <king_duckz@gmx.com>
Date: Tue, 25 Mar 2014 00:21:10 +0100
Subject: [PATCH] Set the viewport size and resolution on resoultion change.

---
 src/sdlmain.cpp | 20 ++++++++++++++++++++
 1 file changed, 20 insertions(+)

diff --git a/src/sdlmain.cpp b/src/sdlmain.cpp
index 5f3601e..eaa6ae7 100644
--- a/src/sdlmain.cpp
+++ b/src/sdlmain.cpp
@@ -23,6 +23,7 @@
 #include "sizeratio.hpp"
 #include <SDL2/SDL.h>
 #include <stdexcept>
+#include <sstream>
 
 namespace cloonel {
 	struct SDLMain::LocalData {
@@ -102,6 +103,25 @@ namespace cloonel {
 	///------------------------------------------------------------------------
 	void SDLMain::SetResolution (ushort2 parRes) {
 		m_localData->sizeratio.UpdateResolution(static_cast<float2>(parRes));
+		{
+			SDL_Renderer* const renderer = GetRenderer();
+			assert(renderer);
+			const int retVal = SDL_RenderSetLogicalSize(renderer, parRes.x(), parRes.y());
+			if (retVal) {
+				std::ostringstream oss;
+				oss << "Error setting logical size to renderer to " << parRes.x() << "x" << parRes.y() << ": " << SDL_GetError();
+				throw std::runtime_error(oss.str());
+			}
+
+			const SDL_Rect area = { 0, 0, parRes.x(), parRes.y() };
+			const int retValViewport = SDL_RenderSetViewport(renderer, &area);
+			if (retValViewport) {
+				std::ostringstream oss;
+				oss << "Error setting viewport to renderer to " << parRes.x() << "x" << parRes.y() << ": " << SDL_GetError();
+				throw std::runtime_error(oss.str());
+			}
+		}
+
 		for (auto currNotifiable : m_localData->resChangeNotifList) {
 			currNotifiable->NotifyResChanged(m_localData->sizeratio);
 		}