Fix gamma slider via pixel shader #178 (#481)

* Fix gamma slider via pixel shader #178

* LCE-like gamma using postprocess shader

Minecraft.Client/Common/Consoles_App.cpp

@@ -1,5 +1,4 @@
-
-#include "stdafx.h"
+#include "stdafx.h"
 #include "..\..\Minecraft.World\net.minecraft.world.entity.item.h"
 #include "..\..\Minecraft.World\net.minecraft.world.entity.player.h"
 #include "..\..\Minecraft.World\net.minecraft.world.level.tile.entity.h"

Minecraft.Client/Common/PostProcesser.h

@@ -0,0 +1,57 @@
+#pragma once
+
+#include <d3d11.h>
+
+class PostProcesser
+{
+public:
+    static PostProcesser& GetInstance()
+    {
+        static PostProcesser instance;
+        return instance;
+    }
+
+    void Init();
+    void Apply() const;
+    void SetViewport(const D3D11_VIEWPORT& viewport);
+    void ResetViewport();
+    void CopyBackbuffer(); // Copy backbuffer once before multi-pass gamma
+    void ApplyFromCopied() const; // Apply gamma using already-copied offscreen texture
+    void Cleanup();
+    void SetGamma(float gamma);
+    float GetGamma() const { return m_gamma; }
+    PostProcesser(const PostProcesser&) = delete;
+    PostProcesser& operator=(const PostProcesser&) = delete;
+
+private:
+    PostProcesser();
+    ~PostProcesser();
+
+    static bool IsRunningUnderWine();
+
+    ID3D11Texture2D* m_pGammaOffscreenTex = nullptr;
+    ID3D11ShaderResourceView* m_pGammaOffscreenSRV = nullptr;
+    ID3D11RenderTargetView* m_pGammaOffscreenRTV = nullptr;
+    ID3D11VertexShader* m_pGammaVS = nullptr;
+    ID3D11PixelShader* m_pGammaPS = nullptr;
+    ID3D11Buffer* m_pGammaCB = nullptr;
+    ID3D11SamplerState* m_pGammaSampler = nullptr;
+    ID3D11RasterizerState* m_pGammaRastState = nullptr;
+    ID3D11DepthStencilState* m_pGammaDepthState = nullptr;
+    ID3D11BlendState* m_pGammaBlendState = nullptr;
+
+    bool m_initialized = false;
+    float m_gamma = 1.0f;
+    bool m_wineMode = false;
+    D3D11_VIEWPORT m_customViewport;
+    bool m_useCustomViewport = false;
+
+    struct GammaCBData
+    {
+        float gamma;
+        float pad[3];
+    };
+
+    static const char* g_gammaVSCode;
+    static const char* g_gammaPSCode;
+};