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materialsystem/stdshaders/cloud_ps20.fxc

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+#define HDRTYPE HDR_TYPE_NONE
+#include "common_ps_fxc.h"
+
+sampler BaseTextureSampler	: register( s0 );
+sampler CloudAlphaSampler	: register( s1 );
+
+struct PS_INPUT
+{
+	float2 baseCoords		: TEXCOORD0;
+	float2 cloudAlphaCoords	: TEXCOORD1;
+	float  fogFactor		: TEXCOORD2;
+};
+ 
+float4 main( PS_INPUT i ) : COLOR
+{
+	float4 vBase = tex2D( BaseTextureSampler, i.baseCoords );
+	float4 vCloudAlpha = tex2D( CloudAlphaSampler, i.cloudAlphaCoords );
+
+	float fogFactor = 2.0f * smoothstep( 0.3f, 0.6f, i.fogFactor );
+
+	float4 result = vBase * vCloudAlpha;
+	result.a *= fogFactor;
+
+	// No actual fog.  Use the "fog factor" to modulate alpha (after some smoothstep mojo)
+	return FinalOutput( result, 1.0f, PIXEL_FOG_TYPE_NONE, TONEMAP_SCALE_LINEAR );
+}