[Add] All in one shader

Assets/Plugins/AllIn1SpriteShader/Shaders/ShaderLibrary/AllIn1SpriteShaderSRP_URPHelper.hlsl

@@ -0,0 +1,14 @@
+#ifndef ALLIN1SPRITESHADERSRP_URPHELPER
+#define ALLIN1SPRITESHADERSRP_URPHELPER
+
+//clipPos and positionWS only used in HDRP. They're here to make both functions have the same parameters
+float4 AllIn1MixFog(float4 inputColor, float4 clipPos, float3 positionWS, float fogCoord)
+{
+	float4 res = inputColor;
+
+	res.rgb = MixFog(inputColor.rgb, fogCoord);
+
+	return res;
+}
+
+#endif //ALLIN1SPRITESHADERSRP_URPHELPER