- Added "gl_bandedswlight" to reduce the software light emulation gradient to 32 levels.

src/gl/renderer/gl_renderstate.cpp

@@ -43,6 +43,7 @@ void gl_SetTextureMode(int type);
 FRenderState gl_RenderState;
 
 CVAR(Bool, gl_direct_state_change, true, 0)
+CVAR(Bool, gl_bandedswlight, true, CVAR_ARCHIVE)
 
 
 static VSMatrix identityMatrix(1);
@@ -146,6 +147,7 @@ bool FRenderState::ApplyShader()
 
 	activeShader->muDesaturation.Set(mDesaturation / 255.f);
 	activeShader->muFogEnabled.Set(fogset);
+	activeShader->muPalLightLevels.Set(gl_bandedswlight);
 	activeShader->muTextureMode.Set(mTextureMode);
 	activeShader->muCameraPos.Set(mCameraPos.vec);
 	activeShader->muLightParms.Set(mLightParms);

src/gl/shaders/gl_shader.cpp

@@ -214,6 +214,7 @@ bool FShader::Load(const char * name, const char * vert_prog_lump, const char *
 
 	muDesaturation.Init(hShader, "uDesaturationFactor");
 	muFogEnabled.Init(hShader, "uFogEnabled");
+	muPalLightLevels.Init(hShader, "uPalLightLevels");
 	muTextureMode.Init(hShader, "uTextureMode");
 	muCameraPos.Init(hShader, "uCameraPos");
 	muLightParms.Init(hShader, "uLightAttr");

src/gl/shaders/gl_shader.h

@@ -259,6 +259,7 @@ class FShader
 
 	FBufferedUniform1f muDesaturation;
 	FBufferedUniform1i muFogEnabled;
+	FBufferedUniform1i muPalLightLevels;
 	FBufferedUniform1i muTextureMode;
 	FBufferedUniform4f muCameraPos;
 	FBufferedUniform4f muLightParms;

wadsrc/static/language.enu

@@ -2647,6 +2647,7 @@ GLPREFMNU_SSAO_PORTALS			= "Portals with AO";
 GLPREFMNU_FXAA					= "FXAA Quality";
 GLPREFMNU_PALTONEMAPORDER		= "Tonemap Palette Order";
 GLPREFMNU_PALTONEMAPPOWER		= "Tonemap Palette Exponent";
+GLPREFMNU_SWLMBANDED			= "Banded SW Lightmode";
 
 // Option Values
 OPTVAL_SMART 				= "Smart";

wadsrc/static/menudef.zz

@@ -232,6 +232,7 @@ OptionMenu "GLPrefOptions"
 {
 	Title "$GLPREFMNU_TITLE"
 	Option "$GLPREFMNU_SECLIGHTMODE",			gl_lightmode,					"LightingModes"
+	Option "$GLPREFMNU_SWLMBANDED",				gl_bandedswlight,				"OnOff"
 	Option "$GLPREFMNU_FOGMODE",				gl_fogmode,						"FogMode"
 	Option "$GLPREFMNU_FOGFORCEFULLBRIGHT",		gl_brightfog,					"YesNo"
 	Slider "$GLPREFMNU_WPNLIGHTSTR",			gl_weaponlight,					0,32, 2

wadsrc/static/shaders/glsl/main.fp

@@ -121,7 +121,11 @@ float R_DoomLightingEquation(float light)
 	/* The zdoom light equation */
 	float vis = globVis / z;
 	float shade = 64.0 - (L + 12.0) * 32.0/128.0;
-	float lightscale = clamp((shade - min(24.0, vis)) / 32.0, 0.0, 31.0/32.0);
+	float lightscale;
+	if (uPalLightLevels != 0)
+		lightscale = clamp(int(shade - min(24.0, vis)) / 32.0, 0.0, 31.0/32.0);
+	else
+		lightscale = clamp((shade - min(24.0, vis)) / 32.0, 0.0, 31.0/32.0);
 
 	// Result is the normalized colormap index (0 bright .. 1 dark)
 	return lightscale;

wadsrc/static/shaders/glsl/shaderdefs.i

@@ -41,6 +41,7 @@ uniform vec4 uLightAttr;
 #define uLightFactor uLightAttr.g
 #define uLightDist uLightAttr.r
 uniform int uFogEnabled;
+uniform int uPalLightLevels;
 
 // dynamic lights
 uniform int uLightIndex;