[Examples] Use preferred available renderer module in examples instead of hard-coded module name.

Instead of using a fixed module name such as "Direct3D12" on Windows, this uses the first available module.
The order of modules returned by RenderSystem::FindModule() has been changed to list the preferred modules first.

Author: LukasBanana

examples/Cpp/ExampleBase/ExampleBase.cpp

@@ -156,7 +156,7 @@ static const char* GetDefaultRendererModule()
     #elif defined LLGL_OS_WIN32
     return "Direct3D11";
     #elif defined LLGL_OS_MACOS
-    return (IsModuleAvailable("Metal") ? "Metal" : "OpenGL");
+    return "Metal";
     #elif defined LLGL_OS_IOS
     return "Metal";
     #elif defined LLGL_OS_ANDROID
@@ -168,11 +168,17 @@ static const char* GetDefaultRendererModule()
     #endif
 }
 
+static std::string GetPreferredRendererModule()
+{
+    auto modules = LLGL::RenderSystem::FindModules();
+    return (modules.empty() ? "Null" : modules.front());
+}
+
 std::string GetSelectedRendererModule(int argc, char* argv[])
 {
     // Set report callback to standard output
     LLGL::Log::RegisterCallbackStd();
-    std::string rendererModule = GetDefaultRendererModule();
+    std::string rendererModule = GetPreferredRendererModule();
     GetSelectedRendererModuleOrDefault(rendererModule, argc, argv);
     return rendererModule;
 }

sources/Renderer/RenderSystemModule.cpp

@@ -35,15 +35,12 @@ RenderSystemModule::RenderSystemModule(
 
 std::vector<std::string> RenderSystemModule::FindModules()
 {
-    /* Iterate over all known modules and return those that are available on the current platform */
+    /* Iterate over all known modules (preferred modules first) and return those that are available on the current platform */
     constexpr const char* knownModules[] =
     {
-        "Null",
-
-        #if defined(LLGL_OS_IOS) || defined(LLGL_OS_ANDROID)
-        "OpenGLES3",
-        #else
-        "OpenGL",
+        #if defined(LLGL_OS_WIN32) || defined(LLGL_OS_UWP)
+        "Direct3D12",
+        "Direct3D11",
         #endif
 
         #if defined(LLGL_OS_MACOS) || defined(LLGL_OS_IOS)
@@ -52,10 +49,13 @@ std::vector<std::string> RenderSystemModule::FindModules()
         "Vulkan",
         #endif
 
-        #if defined(LLGL_OS_WIN32) || defined(LLGL_OS_UWP)
-        "Direct3D11",
-        "Direct3D12",
+        #if defined(LLGL_OS_IOS) || defined(LLGL_OS_ANDROID)
+        "OpenGLES3",
+        #else
+        "OpenGL",
         #endif
+
+        "Null",
     };
 
     std::vector<std::string> moduleNames;