feat(video): add post-processing brightness filter for windowed mode support

Generals/Code/GameEngine/Include/GameClient/CommandXlat.h

@@ -76,6 +76,7 @@ enum FilterTypes CPP_11(: Int)
 	FT_VIEW_BW_FILTER,		//filter to apply a black & white filter to the screen.
 	FT_VIEW_MOTION_BLUR_FILTER, //filter to apply motion blur filter to screen.
 	FT_VIEW_CROSSFADE,				///<filter to apply a cross blend between previous/current views.
+	FT_VIEW_BRIGHTNESS_FILTER,		//filter to apply brightness/gamma adjustment to the screen.
 	FT_MAX
 };
 
@@ -101,7 +102,8 @@ enum FilterModes CPP_11(: Int)
 	FM_VIEW_MB_OUT_SATURATE, // Motion blur filter out saturated blur
 	FM_VIEW_MB_END_PAN_ALPHA, // Moton blur on screen pan (for camera tracks object mode)
 
-
+	// These apply to FT_VIEW_BRIGHTNESS_FILTER
+	FM_VIEW_BRIGHTNESS_ADJUST, // Brightness/gamma adjustment
 
 	// NOTE: This has to be the last entry in this enum.
 	// Add new entries before this one.  jba.

Generals/Code/GameEngine/Source/GameClient/GUI/GUICallbacks/Menus/OptionsMenu.cpp

@@ -1452,6 +1452,17 @@ static void saveOptions( void )
 		{	TheWritableGlobalData->m_displayGamma = gammaval;
 			TheDisplay->setGamma(TheGlobalData->m_displayGamma,0.0f, 1.0f, FALSE);
 		}
+
+		// TheSuperHackers @feature bobtista 11/02/2025 Map slider value to GenTool brightness range (-128 to +256)
+		// Slider: 0=darkest, 50=neutral, 100=brightest
+		// Formula: brightness = (val - 50) * 7.68, clamped to [-128, 256]
+		Int brightness = static_cast<Int>((val - 50) * 7.68f);
+		if (brightness < -128) brightness = -128;
+		if (brightness > 256) brightness = 256;
+
+		// Apply brightness to post-processing filter
+		extern void setBrightnessFilterValue(Int value);  // Forward declaration
+		setBrightnessFilterValue(brightness);
  	}
 
 	//-------------------------------------------------------------------------------------------------

Generals/Code/GameEngineDevice/CMakeLists.txt

@@ -151,6 +151,7 @@ set(GAMEENGINEDEVICE_SRC
     Source/W3DDevice/GameClient/W3DPoly.cpp
     Source/W3DDevice/GameClient/W3DRoadBuffer.cpp
     Source/W3DDevice/GameClient/W3DScene.cpp
+    Source/W3DDevice/GameClient/W3DBrightnessFilter.cpp
     Source/W3DDevice/GameClient/W3DShaderManager.cpp
     Source/W3DDevice/GameClient/W3DShroud.cpp
     Source/W3DDevice/GameClient/W3DStatusCircle.cpp

Generals/Code/GameEngineDevice/Include/W3DDevice/GameClient/W3DBrightnessFilter.h

@@ -0,0 +1,82 @@
+/*
+**	Command & Conquer Generals(tm)
+**	Copyright 2025 Electronic Arts Inc.
+**
+**	This program is free software: you can redistribute it and/or modify
+**	it under the terms of the GNU General Public License as published by
+**	the Free Software Foundation, either version 3 of the License, or
+**	(at your option) any later version.
+**
+**	This program is distributed in the hope that it will be useful,
+**	but WITHOUT ANY WARRANTY; without even the implied warranty of
+**	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+**	GNU General Public License for more details.
+**
+**	You should have received a copy of the GNU General Public License
+**	along with this program.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+////////////////////////////////////////////////////////////////////////////////
+//																																						//
+//  (c) 2025																																//
+//																																						//
+////////////////////////////////////////////////////////////////////////////////
+
+// FILE: W3DBrightnessFilter.h /////////////////////////////////////////////////
+//
+// Brightness adjustment post-processing filter
+// Implements GenTool-style brightness control (-128 to +256 range)
+// - Range 1-128: lifts black level linearly
+// - Range 129-256: lifts brightness while preserving black level
+//
+// Author: @bobtista, November 2025
+//
+///////////////////////////////////////////////////////////////////////////////
+
+#pragma once
+
+#include "W3DShaderManager.h"
+
+/*=========  ScreenBrightnessFilter	=============================================================*/
+/// Applies brightness/gamma adjustment to the viewport using pixel shaders
+class ScreenBrightnessFilter : public W3DFilterInterface
+{
+public:
+	virtual Int set(FilterModes mode);		///<setup shader for the specified rendering pass.
+	virtual Int init(void);			///<perform any one time initialization and validation
+	virtual void reset(void);		///<do any custom resetting necessary to bring W3D in sync.
+	virtual Int shutdown(void);		///<release resources used by shader
+	virtual Bool preRender(Bool &skipRender, CustomScenePassModes &scenePassMode); ///< Set up at start of render.
+	virtual Bool postRender(FilterModes mode, Coord2D &scrollDelta, Bool &doExtraRender); ///< Called after render.
+	virtual Bool setup(FilterModes mode); ///< Called when the filter is started.
+
+	static void setBrightnessValue(Int value);	///< Set brightness value (-128 to +256, GenTool range)
+	static Int getBrightnessValue();	///< Get current brightness value
+
+protected:
+	static DWORD m_pixelShaderHandle;	///< Handle to pixel shader
+	static Int m_brightnessValue;		///< Current brightness value (-128 to +256)
+	static Bool m_isEnabled;			///< Whether brightness adjustment is enabled (disabled when value is 0)
+};
+
+/*=========  ScreenBrightnessFilterFixedFunction	=============================================================*/
+/// Fallback brightness filter using fixed-function pipeline for cards without pixel shader support
+class ScreenBrightnessFilterFixedFunction : public W3DFilterInterface
+{
+public:
+	virtual Int set(FilterModes mode);
+	virtual Int init(void);
+	virtual void reset(void);
+	virtual Int shutdown(void);
+	virtual Bool preRender(Bool &skipRender, CustomScenePassModes &scenePassMode);
+	virtual Bool postRender(FilterModes mode, Coord2D &scrollDelta, Bool &doExtraRender);
+	virtual Bool setup(FilterModes mode);
+
+	static void setBrightnessValue(Int value);
+	static Int getBrightnessValue();
+
+protected:
+	static Int m_brightnessValue;
+	static Bool m_isEnabled;
+};
+