// ------------------------------------------
// Only directional light is supported for lit particles
// No shadow
// No distortion
Shader "Universal Render Pipeline/Particles/Simple Lit"
{
    Properties
    {
        _BaseMap("Base Map", 2D) = "white" {}
        _BaseColor("Base Color", Color) = (1,1,1,1)

        _Cutoff("Alpha Cutoff", Range(0.0, 1.0)) = 0.5

        _SpecGlossMap("Specular", 2D) = "white" {}
        _SpecColor("Specular", Color) = (1.0, 1.0, 1.0)
        _Smoothness("Smoothness", Range(0.0, 1.0)) = 0.5

        _BumpScale("Scale", Float) = 1.0
        _BumpMap("Normal Map", 2D) = "bump" {}

        _EmissionColor("Color", Color) = (0,0,0)
        _EmissionMap("Emission", 2D) = "white" {}

        [HideInInspector] _SmoothnessSource("Smoothness Source", Float) = 0.0
        [ToggleOff] _SpecularHighlights("Specular Highlights", Float) = 1.0

        // -------------------------------------
        // Particle specific
        _SoftParticlesNearFadeDistance("Soft Particles Near Fade", Float) = 0.0
        _SoftParticlesFarFadeDistance("Soft Particles Far Fade", Float) = 1.0
        _CameraNearFadeDistance("Camera Near Fade", Float) = 1.0
        _CameraFarFadeDistance("Camera Far Fade", Float) = 2.0
        _DistortionBlend("Distortion Blend", Float) = 0.5
        _DistortionStrength("Distortion Strength", Float) = 1.0

        // -------------------------------------
        // Hidden properties - Generic
        [HideInInspector] _Surface("__surface", Float) = 0.0
        [HideInInspector] _Blend("__mode", Float) = 0.0
        [HideInInspector] _AlphaClip("__clip", Float) = 0.0
        [HideInInspector] _BlendOp("__blendop", Float) = 0.0
        [HideInInspector] _SrcBlend("__src", Float) = 1.0
        [HideInInspector] _DstBlend("__dst", Float) = 0.0
        [HideInInspector] _ZWrite("__zw", Float) = 1.0
        [HideInInspector] _Cull("__cull", Float) = 2.0

        // Particle specific
        [HideInInspector] _ColorMode("_ColorMode", Float) = 0.0
        [HideInInspector] _BaseColorAddSubDiff("_ColorMode", Vector) = (0,0,0,0)
        [ToggleOff] _FlipbookBlending("__flipbookblending", Float) = 0.0
        [HideInInspector] _SoftParticlesEnabled("__softparticlesenabled", Float) = 0.0
        [HideInInspector] _CameraFadingEnabled("__camerafadingenabled", Float) = 0.0
        [HideInInspector] _SoftParticleFadeParams("__softparticlefadeparams", Vector) = (0,0,0,0)
        [HideInInspector] _CameraFadeParams("__camerafadeparams", Vector) = (0,0,0,0)
        [HideInInspector] _DistortionEnabled("__distortionenabled", Float) = 0.0
        [HideInInspector] _DistortionStrengthScaled("Distortion Strength Scaled", Float) = 0.1

        // Editmode props
        [HideInInspector] _QueueOffset("Queue offset", Float) = 0.0

        // ObsoleteProperties
        [HideInInspector] _FlipbookMode("flipbook", Float) = 0
        [HideInInspector] _Glossiness("gloss", Float) = 0
        [HideInInspector] _Mode("mode", Float) = 0
        [HideInInspector] _Color("color", Color) = (1,1,1,1)
    }

    SubShader
    {
        Tags{"RenderType" = "Opaque" "IgnoreProjector" = "True" "PreviewType" = "Plane" "PerformanceChecks" = "False" "RenderPipeline" = "UniversalPipeline"}

        // ------------------------------------------------------------------
        //  Forward pass.
        Pass
        {
            // Lightmode matches the ShaderPassName set in UniversalRenderPipeline.cs. SRPDefaultUnlit and passes with
            // no LightMode tag are also rendered by Universal Render Pipeline
            Name "ForwardLit"
            Tags {"LightMode" = "UniversalForward"}

            BlendOp[_BlendOp]
            Blend[_SrcBlend][_DstBlend]
            ZWrite[_ZWrite]
            Cull[_Cull]

            HLSLPROGRAM
            // Required to compile gles 2.0 with standard SRP library
            // All shaders must be compiled with HLSLcc and currently only gles is not using HLSLcc by default
            #pragma prefer_hlslcc gles
            #pragma exclude_renderers d3d11_9x
            #pragma target 2.0

            // -------------------------------------
            // Material Keywords
            #pragma shader_feature _NORMALMAP
            #pragma shader_feature _EMISSION
            #pragma shader_feature _ _SPECGLOSSMAP _SPECULAR_COLOR
            #pragma shader_feature _GLOSSINESS_FROM_BASE_ALPHA
            #pragma shader_feature _RECEIVE_SHADOWS_OFF

            // -------------------------------------
            // Particle Keywords
            #pragma shader_feature _ _ALPHAPREMULTIPLY_ON _ALPHAMODULATE_ON
            #pragma shader_feature _ALPHATEST_ON
            #pragma shader_feature _ _COLOROVERLAY_ON _COLORCOLOR_ON _COLORADDSUBDIFF_ON
            #pragma shader_feature _FLIPBOOKBLENDING_ON
            #pragma shader_feature _SOFTPARTICLES_ON
            #pragma shader_feature _FADING_ON
            #pragma shader_feature _DISTORTION_ON

            // -------------------------------------
            // Universal Pipeline keywords
            #pragma multi_compile _ _MAIN_LIGHT_SHADOWS
            #pragma multi_compile _ _MAIN_LIGHT_SHADOWS_CASCADE
            #pragma multi_compile _ _ADDITIONAL_LIGHTS_VERTEX _ADDITIONAL_LIGHTS
            #pragma multi_compile _ _ADDITIONAL_LIGHT_SHADOWS
            #pragma multi_compile _ _SHADOWS_SOFT

            // -------------------------------------
            // Unity defined keywords
            #pragma multi_compile_fog

            #pragma vertex ParticlesLitVertex
            #pragma fragment ParticlesLitFragment
            #define BUMP_SCALE_NOT_SUPPORTED 1

            #include "Packages/com.unity.render-pipelines.universal/Shaders/Particles/ParticlesSimpleLitInput.hlsl"
            #include "Packages/com.unity.render-pipelines.universal/Shaders/Particles/ParticlesSimpleLitForwardPass.hlsl"
            ENDHLSL
        }
        Pass
        {
            Name "Universal2D"
            Tags{ "LightMode" = "Universal2D" }

            Blend[_SrcBlend][_DstBlend]
            ZWrite[_ZWrite]
            Cull[_Cull]

            HLSLPROGRAM
            // Required to compile gles 2.0 with standard srp library
            #pragma prefer_hlslcc gles
            #pragma exclude_renderers d3d11_9x

            #pragma vertex vert
            #pragma fragment frag
            #pragma shader_feature _ALPHATEST_ON
            #pragma shader_feature _ALPHAPREMULTIPLY_ON

            #include "Packages/com.unity.render-pipelines.universal/Shaders/UnlitInput.hlsl"
            #include "Packages/com.unity.render-pipelines.universal/Shaders/Utils/Universal2D.hlsl"
            ENDHLSL
        }
    }

    Fallback "Universal Render Pipeline/Particles/Unlit"
    CustomEditor "UnityEditor.Rendering.Universal.ShaderGUI.ParticlesSimpleLitShader"
}