// - forwardPass(Lightweight Vertex Lit) + ShadowCaster + DepthOnly
// - Premultiplied Alpha Blending (Optional straight alpha input)
// - Double-sided, no depth

Shader "Lightweight Render Pipeline/Spine/Skeleton Lit" {
	Properties {
		_Cutoff ("Shadow alpha cutoff", Range(0,1)) = 0.1
		[NoScaleOffset] _MainTex ("Main Texture", 2D) = "black" {}
		[Toggle(_STRAIGHT_ALPHA_INPUT)] _StraightAlphaInput("Straight Alpha Texture", Int) = 0
		[HideInInspector] _StencilRef("Stencil Reference", Float) = 1.0
		[Enum(UnityEngine.Rendering.CompareFunction)] _StencilComp("Stencil Compare", Float) = 0.0 // Disabled stencil test by default
	}

	SubShader {
		// Lightweight Pipeline tag is required. If Lightweight render pipeline is not set in the graphics settings
		// this Subshader will fail.
		Tags { "RenderPipeline" = "LightweightPipeline" "Queue"="Transparent" "IgnoreProjector"="True" "RenderType"="Transparent" }
		LOD 100
		Cull Off
		ZWrite Off
		Blend One OneMinusSrcAlpha
		
		Stencil {
			Ref[_StencilRef]
			Comp[_StencilComp]
			Pass Keep
		}

		Pass {
			Name "ForwardLit"
			Tags{"LightMode" = "LightweightForward"}

			ZWrite Off
			Cull Off
			Blend One OneMinusSrcAlpha

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

			// -------------------------------------
			// Lightweight 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
			#pragma multi_compile _ _MIXED_LIGHTING_SUBTRACTIVE
			
			// -------------------------------------
			// Unity defined keywords
			#pragma multi_compile_fog

			//--------------------------------------
			// GPU Instancing
			#pragma multi_compile_instancing

			//--------------------------------------
			// Spine related keywords
			#pragma shader_feature _ _STRAIGHT_ALPHA_INPUT
			#pragma vertex vert
			#pragma fragment frag
			#pragma target 2.0

			#undef LIGHTMAP_ON

			#include "Packages/com.unity.render-pipelines.lightweight/ShaderLibrary/Core.hlsl"
			#include "Packages/com.unity.render-pipelines.lightweight/ShaderLibrary/Lighting.hlsl"

			#define USE_LWRP
			#define fixed4 half4
			#define fixed3 half3
			#define fixed half
			#include "CGIncludes/Spine-SkeletonLit-ForwardPass-LW.hlsl"
			ENDHLSL
	 	}

		Pass
		{
			Name "ShadowCaster"
			Tags{"LightMode" = "ShadowCaster"}

			ZWrite On
			ZTest LEqual
			Cull Off

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

			// -------------------------------------
			// Material Keywords
			#pragma shader_feature _ALPHATEST_ON

			//--------------------------------------
			// GPU Instancing
			#pragma multi_compile_instancing
			#pragma shader_feature _SMOOTHNESS_TEXTURE_ALBEDO_CHANNEL_A

			#pragma vertex ShadowPassVertexSkeletonLit
			#pragma fragment ShadowPassFragmentSkeletonLit

			#include "Packages/com.unity.render-pipelines.lightweight/Shaders/LitInput.hlsl"
			#include "Packages/com.unity.render-pipelines.lightweight/Shaders/ShadowCasterPass.hlsl"

			#define USE_LWRP
			#define fixed4 half4
			#define fixed3 half3
			#define fixed half
			#include "CGIncludes/Spine-Input-LW.hlsl"
			#include "CGIncludes/Spine-SkeletonLit-ShadowCasterPass-LW.hlsl"

			ENDHLSL
		}

		Pass
		{
			Name "DepthOnly"
			Tags{"LightMode" = "DepthOnly"}

			ZWrite On
			ColorMask 0
			Cull Off

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

			#pragma vertex DepthOnlyVertexSprite
			#pragma fragment DepthOnlyFragmentSprite

			// -------------------------------------
			// Material Keywords
			#pragma shader_feature _ALPHATEST_ON
			#pragma shader_feature _SMOOTHNESS_TEXTURE_ALBEDO_CHANNEL_A

			//--------------------------------------
			// GPU Instancing
			#pragma multi_compile_instancing

			#include "Packages/com.unity.render-pipelines.lightweight/Shaders/LitInput.hlsl"
			#include "Packages/com.unity.render-pipelines.lightweight/Shaders/DepthOnlyPass.hlsl"

			#define USE_LWRP
			#define fixed4 half4
			#define fixed3 half3
			#define fixed half
			#include "CGIncludes/Spine-Input-LW.hlsl"
			#include "CGIncludes/Spine-DepthOnlyPass-LW.hlsl"
			ENDHLSL
		}
	}

	FallBack "Hidden/InternalErrorShader"
}