[Shaders] SLSF2_Weapon_Blood support

res/shaders/sk_effectshader.frag

@@ -14,6 +14,8 @@ uniform bool useFalloff;
 uniform bool vertexColors;
 uniform bool vertexAlpha;
 
+uniform bool hasWeaponBlood;
+
 uniform vec4 glowColor;
 uniform float glowMult;
 
@@ -67,8 +69,16 @@ void main( void )
 
 	float alphaMult = glowColor.a * glowColor.a;
 
-	color.rgb = baseMap.rgb * C.rgb * glowColor.rgb;
-	color.a = baseMap.a * C.a * falloff * alphaMult;
+	color.rgb = baseMap.rgb;
+	color.a = baseMap.a;
+
+	if ( hasWeaponBlood ) {
+		color.rgb = vec3( 1.0, 0.0, 0.0 ) * baseMap.r;
+		color.a = baseMap.a * baseMap.g;
+	}
+
+	color.rgb *= C.rgb * glowColor.rgb;
+	color.a *= C.a * falloff * alphaMult;
 
 	if ( greyscaleColor ) {
 		// Only Red emissive channel is used

src/gl/glmesh.cpp

@@ -322,6 +322,7 @@ void Mesh::update( const NifModel * nif, const QModelIndex & index )
 					bsesp->vertexAlpha = hasSF1( ShaderFlags::SLSF1_Vertex_Alpha );
 					bsesp->vertexColors = hasSF2( ShaderFlags::SLSF2_Vertex_Colors );
 
+					bsesp->hasWeaponBlood = hasSF2( ShaderFlags::SLSF2_Weapon_Blood );
 
 					auto uvScale = nif->get<Vector2>( iProp, "UV Scale" );
 					auto uvOffset = nif->get<Vector2>( iProp, "UV Offset" );

src/gl/glproperty.h

@@ -710,6 +710,8 @@ class BSEffectShaderProperty final : public BSShaderLightingProperty
 	bool vertexColors;
 	bool vertexAlpha;
 
+	bool hasWeaponBlood;
+
 	struct Falloff
 	{
 		float startAngle = 1.0f;

src/gl/renderer.cpp

@@ -853,6 +853,7 @@ bool Renderer::setupProgram( Program * prog, Mesh * mesh, const PropertyList & p
 		uni1i( "vertexAlpha", mesh->bsesp->vertexAlpha );
 		uni1i( "vertexColors", mesh->bsesp->vertexColors );
 
+		uni1i( "hasWeaponBlood", mesh->bsesp->hasWeaponBlood );
 
 		// Glow params