From 5941e0af56d87c2e3f5cbb03e557e521a2087784 Mon Sep 17 00:00:00 2001
From: King_DuckZ <king_duckz@gmx.com>
Date: Wed, 6 Aug 2014 17:44:28 +0200
Subject: [PATCH] Chose the renderer driver instead of passing -1 (default).

---
 CMakeLists.txt  |  7 ++++++-
 src/main.cpp    |  1 +
 src/sdlmain.cpp | 50 ++++++++++++++++++++++++++++++++++++++++++++++++-
 src/sdlmain.hpp |  2 ++
 4 files changed, 58 insertions(+), 2 deletions(-)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 45273bf..fef7a7d 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -6,6 +6,11 @@ set(CMAKE_CXX_FLAGS_DEBUG "${CMAKE_CXX_FLAGS_DEBUG} -std=c++11 -Wall -Wextra -pe
 set(CMAKE_CXX_FLAGS_RELEASE "${CMAKE_CXX_FLAGS_RELEASE} -std=c++11 -Wall -Wextra -pedantic -Wconversion")
 
 option(WITH_BUILTIN_PHYSFS "Force using the version of PhysFS accompanying the code even if a system library is available" OFF)
+option(FORCE_OPENGLES "Try to chose the openGL ES renderer if available. Enable this on Raspberry Pi" OFF)
+
+if (FORCE_OPENGLES)
+	add_definitions(-DFORCE_OPENGLES)
+endif (FORCE_OPENGLES)
 
 include(FindPkgConfig)
 PKG_SEARCH_MODULE(SDL2 REQUIRED sdl2)
@@ -26,7 +31,7 @@ endif(PHYSFS_FOUND)
 
 add_definitions(
 	${PNG_DEFINITIONS}
-	-DWITH_VERBOSE_OBS_MANAGER
+#	-DWITH_VERBOSE_OBS_MANAGER
 	-DWITH_VERBOSE_COLLIDER
 )
 
diff --git a/src/main.cpp b/src/main.cpp
index 1edfad4..c13a0f6 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -58,6 +58,7 @@ int main (int, char* parArgv[]) {
 		physfs.Append(GAME_BASE_PATH "/resources/", "resources");
 
 		sdlmain.Init();
+		std::cout << "Using renderer \"" << sdlmain.GetRendererName() << "\"\n";
 
 		cloonel::GameplaySceneClassic game(&sdlmain);
 		RunMainLoop(game);
diff --git a/src/sdlmain.cpp b/src/sdlmain.cpp
index 44c0d52..f2c9654 100644
--- a/src/sdlmain.cpp
+++ b/src/sdlmain.cpp
@@ -24,8 +24,50 @@
 #include <SDL2/SDL.h>
 #include <stdexcept>
 #include <sstream>
+#include <ciso646>
+#include <cstring>
+#include <utility>
 
 namespace cloonel {
+	namespace {
+		///----------------------------------------------------------------------
+		///----------------------------------------------------------------------
+		std::pair<int, std::string> GetRenderingDriver() {
+			typedef std::pair<int, std::string> RetPairType;
+
+			const int count = SDL_GetNumRenderDrivers();
+			int opengles = -1;
+			int opengles2 = -1;
+			int opengl = -1;
+			SDL_RendererInfo info;
+			for (int z = 0; z < count; ++z) {
+				const int ret = SDL_GetRenderDriverInfo(z, &info);
+				if (0 == ret) {
+					if (std::strcmp("opengles", info.name) == 0)
+						opengles = z;
+					else if (std::strcmp("opengles2", info.name) == 0)
+						opengles2 = z;
+					else if (std::strcmp("opengl", info.name) == 0)
+						opengl = z;
+				}
+			}
+#if !defined(FORCE_OPENGLES)
+			if (opengl > -1)
+				return RetPairType(opengl, "opengl");
+#endif
+			if (opengles2 > -1)
+				return RetPairType(opengles2, "opengles2");
+			if (opengles > -1)
+				return RetPairType(opengles, "opengles");
+#if defined(FORCE_OPENGLES)
+			if (opengl > -1)
+				return RetPairType(opengl, "opengl");
+#endif
+
+			return RetPairType(-1, "default");
+		}
+	} //unnamed namespace
+
 	struct SDLMain::LocalData {
 		SDL_Window* window;
 		SDL_Renderer* renderer;
@@ -67,13 +109,19 @@ namespace cloonel {
 			throw std::runtime_error(SDL_GetError());
 		parInitSDL.initialized = true;
 
+#if defined(FORCE_OPENGLES)
+		SDL_GL_SetAttribute(SDL_GL_CONTEXT_PROFILE_MASK, SDL_GL_CONTEXT_PROFILE_ES);
+#endif
+
 		const float2 wh(m_localData->sizeratio.Resolution());
 		SDL_Window* const win = SDL_CreateWindow(m_gameName.c_str(), 100, 100, static_cast<int>(wh.x()), static_cast<int>(wh.y()), SDL_WINDOW_SHOWN | SDL_WINDOW_RESIZABLE);
 		if (!win)
 			throw std::runtime_error(SDL_GetError());
 		parInitSDL.window = win;
 
-		SDL_Renderer* const renderer = SDL_CreateRenderer(win, -1, SDL_RENDERER_ACCELERATED | SDL_RENDERER_PRESENTVSYNC);
+		const auto rendererDriver = GetRenderingDriver();
+		m_rendererName = rendererDriver.second;
+		SDL_Renderer* const renderer = SDL_CreateRenderer(win, rendererDriver.first, SDL_RENDERER_ACCELERATED | SDL_RENDERER_PRESENTVSYNC);
 		if (!renderer)
 			throw std::runtime_error(SDL_GetError());
 		parInitSDL.renderer = renderer;
diff --git a/src/sdlmain.hpp b/src/sdlmain.hpp
index 74e8ffd..725540c 100644
--- a/src/sdlmain.hpp
+++ b/src/sdlmain.hpp
@@ -42,6 +42,7 @@ namespace cloonel {
 		size_t RegisterForResChange ( SizeNotifiableBase* parNotif );
 		void UnregisterForResChange ( size_t parID ) noexcept;
 		void SwapRegisteredForResChange ( size_t parID, SizeNotifiableBase* parNotif );
+		const std::string& GetRendererName ( void ) const { return m_rendererName; }
 
 	private:
 		struct LocalData;
@@ -50,6 +51,7 @@ namespace cloonel {
 		void ClearIFN ( LocalData& parData ) noexcept;
 
 		const std::string m_gameName;
+		std::string m_rendererName;
 		std::unique_ptr<LocalData> m_localData;
 	};
 } //namespace cloonel