Huge shader refactor

Shaders/CScanLinesFilter.shader

@@ -0,0 +1,123 @@
+#shader CScanLinesFilterAlpha
+#attribute position4
+#srcfac srcalpha
+#dstfac invsrcalpha
+#primitive tristrips
+#depthtest none
+#depthwrite false
+#culling none
+
+#vertex glsl
+layout(location=0) in vec4 posIn;
+
+UBINDING0 uniform ScanLinesUniform
+{
+    vec4 color;
+};
+
+struct VertToFrag
+{
+    vec4 color;
+};
+
+SBINDING(0) out VertToFrag vtf;
+void main()
+{
+    vtf.color = color;
+    gl_Position = vec4(posIn.xyz, 1.0);
+}
+
+#fragment glsl
+struct VertToFrag
+{
+    vec4 color;
+};
+
+SBINDING(0) in VertToFrag vtf;
+layout(location=0) out vec4 colorOut;
+void main()
+{
+    colorOut = vtf.color;
+}
+
+#vertex hlsl
+struct VertData
+{
+    float4 posIn : POSITION;
+};
+
+cbuffer ScanLinesUniform : register(b0)
+{
+    float4 color;
+};
+
+struct VertToFrag
+{
+    float4 position : SV_Position;
+    float4 color : COLOR;
+};
+
+VertToFrag main(in VertData v)
+{
+    VertToFrag vtf;
+    vtf.color = color;
+    vtf.position = float4(v.posIn.xyz, 1.0);
+    return vtf;
+}
+
+#fragment hlsl
+struct VertToFrag
+{
+    float4 position : SV_Position;
+    float4 color : COLOR;
+};
+
+float4 main(in VertToFrag vtf) : SV_Target0
+{
+    return vtf.color;
+}
+
+#vertex metal
+struct VertData
+{
+    float4 posIn [[ attribute(0) ]];
+};
+
+struct ScanLinesUniform
+{
+    float4 color;
+};
+
+struct VertToFrag
+{
+    float4 position [[ position ]];
+    float4 color;
+};
+
+vertex VertToFrag vmain(VertData v [[ stage_in ]], constant ScanLinesUniform& cqu [[ buffer(2) ]])
+{
+    VertToFrag vtf;
+    vtf.color = cqu.color;
+    vtf.position = float4(v.posIn.xyz, 1.0);
+    return vtf;
+}
+
+#fragment metal
+struct VertToFrag
+{
+    float4 position [[ position ]];
+    float4 color;
+};
+
+fragment float4 fmain(VertToFrag vtf [[ stage_in ]])
+{
+    return vtf.color;
+}
+
+#shader CScanLinesFilterAdd : CScanLinesFilterAlpha
+#srcfac srcalpha
+#dstfac one
+
+#shader CScanLinesFilterMult : CScanLinesFilterAlpha
+#srcfac zero
+#dstfac srccolor