- allow to reload shaders on restart.

Works on OpenGL but not on Vulkan.

src/d_main.cpp

@@ -2449,6 +2449,10 @@ void D_DoomMain (void)
 			// This allocates a dummy framebuffer as a stand-in until V_Init2 is called.
 			V_InitScreen();
 		}
+		else
+		{
+			screen->ReloadState();
+		}
 
 		GameConfig->DoKeySetup(gameinfo.ConfigName);
 

src/rendering/gl/system/gl_framebuffer.cpp

@@ -101,6 +101,22 @@ OpenGLFrameBuffer::~OpenGLFrameBuffer()
 	}
 }
 
+//==========================================================================
+//
+// The entire state is encapsulated in GLRenderer, so deleting
+// and recreating that woll do what we need, most importantly
+// recompilation of the shaders.
+//
+//==========================================================================
+
+void OpenGLFrameBuffer::ReloadState()
+{
+	if (GLRenderer) delete GLRenderer;
+	GLRenderer = new FGLRenderer(this);
+	GLRenderer->Initialize(GetWidth(), GetHeight());
+}
+
+
 //==========================================================================
 //
 // Initializes the GL renderer

src/rendering/gl/system/gl_framebuffer.h

@@ -22,6 +22,7 @@ public:
 	~OpenGLFrameBuffer();
 
 	void InitializeState() override;
+	void ReloadState() override;
 	void Update() override;
 
 	void CleanForRestart() override;

src/rendering/v_video.h

@@ -393,6 +393,7 @@ public:
 	DFrameBuffer (int width=1, int height=1);
 	virtual ~DFrameBuffer();
 	virtual void InitializeState() = 0;	// For stuff that needs 'screen' set.
+	virtual void ReloadState() = 0;
 	virtual bool IsVulkan() { return false; }
 
 	void SetSize(int width, int height);

src/rendering/vulkan/system/vk_framebuffer.cpp

@@ -184,6 +184,11 @@ void VulkanFrameBuffer::InitializeState()
 	}
 }
 
+void VulkanFrameBuffer::ReloadState()
+{
+	InitializeState();
+}
+
 void VulkanFrameBuffer::Update()
 {
 	twoD.Reset();

src/rendering/vulkan/system/vk_framebuffer.h

@@ -72,6 +72,7 @@ public:
 	void Update();
 
 	void InitializeState() override;
+	void ReloadState() override;
 
 	void CleanForRestart() override;
 	void PrecacheMaterial(FMaterial *mat, int translation) override;