diff --git a/cvarinfo.marifx b/cvarinfo.marifx
index e4743f1..29786a6 100644
--- a/cvarinfo.marifx
+++ b/cvarinfo.marifx
@@ -6,6 +6,7 @@ nosave float mfx_lsharpclamp = .05;
 nosave float mfx_lsharpblend = 6.;
 
 nosave bool mfx_ne = false;
+nosave bool mfx_nc = true;
 nosave float mfx_ni = .05;
 nosave float mfx_ns = 0.;
 nosave float mfx_nf = .05;
diff --git a/gldefs.txt b/gldefs.txt
index 865cef0..bfc0e9e 100644
--- a/gldefs.txt
+++ b/gldefs.txt
@@ -23,6 +23,18 @@ HardwareShader postprocess scene
 	Uniform int nb
 	Texture NoiseTexture "textures/mfxnoise.png"
 }
+HardwareShader postprocess scene
+{
+	Name "mfx_grain_simple"
+	Shader "shaders/glsl/mfx_grain_simple.fp" 330
+	Uniform float Timer
+	Uniform float nf
+	Uniform float ni
+	Uniform float ns
+	Uniform float np
+	Uniform float bnp
+	Uniform int nb
+}
 
 HardwareShader postprocess scene
 {
diff --git a/language.txt b/language.txt
index 9f25075..38b22cd 100644
--- a/language.txt
+++ b/language.txt
@@ -118,6 +118,7 @@ MFX_LSHARPRADIUS="Sharpen Radius";
 MFX_LSHARPTRESHOLD="Sharpen Threshold";
 MFX_LSHARPSTRENGTH="Sharpen Strength";
 MFX_GRAIN="Film Grain";
+MFX_GRAINALT="Simplified Grain";
 MFX_NF="Grain Speed";
 MFX_NI="Grain Intensity";
 MFX_NS="Grain Saturation";
diff --git a/menudef.txt b/menudef.txt
index 5115d9f..8051bed 100644
--- a/menudef.txt
+++ b/menudef.txt
@@ -163,17 +163,18 @@ OptionMenu "MFXOptionsMenu"
 	StaticText "$MFX_GRAIN", 1
 	StaticText " "
 	Option "$MFX_ENABLE", "mfx_ne", "YesNo"
+	Option "$MFX_GRAINALT", "mfx_nc", "NoYes"
 	MFXSlider "$MFX_NI", "mfx_ni", 0, 1, 0.01, 2
-	MFXSlider "$MFX_NF", "mfx_nf", -10, 10, 0.01, 2
+	MFXSlider "$MFX_NF", "mfx_nf", -10, 10, 0.01, 2, "mfx_nc"
 	MFXSlider "$MFX_NS", "mfx_ns", -1, 1, 0.01, 2
 	MFXSlider "$MFX_NP", "mfx_np", 0, 8, 0.01, 2
-	MFXSlider "$MFX_NM1_R", "mfx_nm1_r", 0, 10, 0.01, 2
-	MFXSlider "$MFX_NM1_G", "mfx_nm1_g", 0, 10, 0.01, 2
-	MFXSlider "$MFX_NM1_B", "mfx_nm1_b", 0, 10, 0.01, 2
-	MFXSlider "$MFX_NK", "mfx_nk", 0, 1, 0.01, 2
-	MFXSlider "$MFX_NM2_R", "mfx_nm2_r", 0, 10, 0.01, 2
-	MFXSlider "$MFX_NM2_G", "mfx_nm2_g", 0, 10, 0.01, 2
-	MFXSlider "$MFX_NM2_B", "mfx_nm2_b", 0, 10, 0.01, 2
+	MFXSlider "$MFX_NM1_R", "mfx_nm1_r", 0, 10, 0.01, 2, "mfx_nc"
+	MFXSlider "$MFX_NM1_G", "mfx_nm1_g", 0, 10, 0.01, 2, "mfx_nc"
+	MFXSlider "$MFX_NM1_B", "mfx_nm1_b", 0, 10, 0.01, 2, "mfx_nc"
+	MFXSlider "$MFX_NK", "mfx_nk", 0, 1, 0.01, 2, "mfx_nc"
+	MFXSlider "$MFX_NM2_R", "mfx_nm2_r", 0, 10, 0.01, 2, "mfx_nc"
+	MFXSlider "$MFX_NM2_G", "mfx_nm2_g", 0, 10, 0.01, 2, "mfx_nc"
+	MFXSlider "$MFX_NM2_B", "mfx_nm2_b", 0, 10, 0.01, 2, "mfx_nc"
 	Option "$MFX_NB", "mfx_nb", "MFXGrainBlend"
 	MFXSlider "$MFX_BNP", "mfx_bnp", 0, 10, 0.01, 2
 	SafeCommand "$MFX_RESET", "event resetmfxvars 0"
diff --git a/shaders/glsl/mfx_grain_simple.fp b/shaders/glsl/mfx_grain_simple.fp
new file mode 100644
index 0000000..a6d71a4
--- /dev/null
+++ b/shaders/glsl/mfx_grain_simple.fp
@@ -0,0 +1,54 @@
+/*
+   Complex grain shader ported over from MariENB
+   This is a simplified version that uses three PRNG calls
+   (C)2012-2022 Marisa the Magician
+*/
+#define overlay(a,b) (a<0.5)?(2.0*a*b):(1.0-(2.0*(1.0-a)*(1.0-b)))
+#define darkmask(a,b) (a>0.5)?(2.0*a*(0.5+b)):(1.0-2.0*(1.0-a)*(1.0-((0.5+b))))
+
+// simplified PRNG, for performance
+float rnd( in vec2 sd )
+{
+	return fract(sin(dot(sd,vec2(12.9898,78.233)))*43758.5453);
+}
+
+vec3 grain( in vec3 res, in vec2 coord )
+{
+	float ts = Timer;
+	vec2 s1 = coord+vec2(0.,ts);
+	vec2 s2 = coord+vec2(ts,0.);
+	vec2 s3 = coord+vec2(ts,ts);
+	float n1 = rnd(s1);
+	float n2 = rnd(s2);
+	float n3 = rnd(s3);
+	float n4 = (n1+n2+n3)/3.;
+	vec3 ng = vec3(n4);
+	vec3 nc = vec3(n1,n2,n3);
+	vec3 nt = pow(clamp(mix(ng,nc,ns),.0,1.),vec3(np));
+	if ( nb == 1 ) res.rgb += nt*ni;
+	else if ( nb == 2 )
+	{
+		res.r = overlay(res.r,(nt.r*ni));
+		res.g = overlay(res.g,(nt.g*ni));
+		res.b = overlay(res.b,(nt.b*ni));
+	}
+	else if ( nb == 3 )
+	{
+		float bn = 1.-clamp((res.r+res.g+res.b)/3.,0.,1.);
+		bn = pow(bn,bnp);
+		vec3 nn = clamp(nt*bn,vec3(0.),vec3(1.));
+		res.r = darkmask(res.r,(nn.r*ni));
+		res.g = darkmask(res.g,(nn.g*ni));
+		res.b = darkmask(res.b,(nn.b*ni));
+	}
+	else res.rgb = mix(res.rgb,nt,ni);
+	return res;
+}
+
+void main()
+{
+	vec2 coord = TexCoord;
+	vec4 res = texture(InputTexture,coord);
+	res.rgb = grain(res.rgb,coord);
+	FragColor = res;
+}
diff --git a/zscript/mfx_handler.zsc b/zscript/mfx_handler.zsc
index ec278ac..9345037 100644
--- a/zscript/mfx_handler.zsc
+++ b/zscript/mfx_handler.zsc
@@ -10,6 +10,7 @@ Class MariFXHandler : StaticEventHandler
 		{
 			Shader.SetEnabled(p,"mfx_lumasharp",false);
 			Shader.SetEnabled(p,"mfx_grain",false);
+			Shader.SetEnabled(p,"mfx_grain_simple",false);
 			Shader.SetEnabled(p,"mfx_dirt",false);
 			Shader.SetEnabled(p,"mfx_grading",false);
 			Shader.SetEnabled(p,"mfx_lutgrading",false);
@@ -34,17 +35,32 @@ Class MariFXHandler : StaticEventHandler
 		Shader.SetUniform1f(p,"mfx_lumasharp","sharpclamp",mfx_lsharpclamp);
 		Shader.SetUniform1f(p,"mfx_lumasharp","sharpblend",mfx_lsharpblend);
 		// FILM GRAIN
-		Shader.SetEnabled(p,"mfx_grain",mfx_ne);
-		Shader.SetUniform1f(p,"mfx_grain","nf",mfx_nf/10.);
-		Shader.SetUniform1f(p,"mfx_grain","ni",mfx_ni);
-		Shader.SetUniform1f(p,"mfx_grain","ns",mfx_ns);
-		Shader.SetUniform3f(p,"mfx_grain","nm1",(mfx_nm1_r,mfx_nm1_g,mfx_nm1_b));
-		Shader.SetUniform1f(p,"mfx_grain","nk",mfx_nk);
-		Shader.SetUniform3f(p,"mfx_grain","nm2",(mfx_nm2_r,mfx_nm2_g,mfx_nm2_b));
-		Shader.SetUniform1f(p,"mfx_grain","np",mfx_np);
-		Shader.SetUniform1f(p,"mfx_grain","bnp",mfx_bnp);
-		Shader.SetUniform1i(p,"mfx_grain","nb",mfx_nb);
-		Shader.SetUniform1f(p,"mfx_grain","Timer",(gametic+e.fractic)/35.);
+		if ( mfx_nc )
+		{
+			Shader.SetEnabled(p,"mfx_grain",mfx_ne);
+			Shader.SetEnabled(p,"mfx_grain_simple",false);
+			Shader.SetUniform1f(p,"mfx_grain","nf",mfx_nf/10.);
+			Shader.SetUniform1f(p,"mfx_grain","ni",mfx_ni);
+			Shader.SetUniform1f(p,"mfx_grain","ns",mfx_ns);
+			Shader.SetUniform3f(p,"mfx_grain","nm1",(mfx_nm1_r,mfx_nm1_g,mfx_nm1_b));
+			Shader.SetUniform1f(p,"mfx_grain","nk",mfx_nk);
+			Shader.SetUniform3f(p,"mfx_grain","nm2",(mfx_nm2_r,mfx_nm2_g,mfx_nm2_b));
+			Shader.SetUniform1f(p,"mfx_grain","np",mfx_np);
+			Shader.SetUniform1f(p,"mfx_grain","bnp",mfx_bnp);
+			Shader.SetUniform1i(p,"mfx_grain","nb",mfx_nb);
+			Shader.SetUniform1f(p,"mfx_grain","Timer",(gametic+e.fractic)/35.);
+		}
+		else
+		{
+			Shader.SetEnabled(p,"mfx_grain",false);
+			Shader.SetEnabled(p,"mfx_grain_simple",mfx_ne);
+			Shader.SetUniform1f(p,"mfx_grain_simple","ni",mfx_ni);
+			Shader.SetUniform1f(p,"mfx_grain_simple","ns",mfx_ns);
+			Shader.SetUniform1f(p,"mfx_grain_simple","np",mfx_np);
+			Shader.SetUniform1f(p,"mfx_grain_simple","bnp",mfx_bnp);
+			Shader.SetUniform1i(p,"mfx_grain_simple","nb",mfx_nb);
+			Shader.SetUniform1f(p,"mfx_grain_simple","Timer",(gametic+e.fractic)/35.);
+		}
 		// SCREEN DIRT
 		Shader.SetEnabled(p,"mfx_dirt",mfx_dirtenable);
 		Shader.SetUniform1f(p,"mfx_dirt","dirtmc",mfx_dirtmc);
@@ -170,6 +186,7 @@ Class MariFXHandler : StaticEventHandler
 			{
 			case 0:
 				CVar.FindCVar('mfx_ne').ResetToDefault();
+				CVar.FindCVar('mfx_nc').ResetToDefault();
 				CVar.FindCVar('mfx_ni').ResetToDefault();
 				CVar.FindCVar('mfx_nf').ResetToDefault();
 				CVar.FindCVar('mfx_ns').ResetToDefault();