Thanks
I will do some test and see which option is best for my need.
Harald wrote
You can quite easily create your own modified copy (or replacement) of the Skeleton PMA Multiply shader. You just have to add the relevant parts from the Skeleton Tint shader
I finally tried the tint black approach recently. I modified the mentioned 3 lines in the shader but the sprites which use multiply blend mode display pure purple color. Is there something else I need to do to make it work?
Here is the modified shader:
// Spine/Skeleton PMA Multiply
// - single color multiply tint
// - unlit
// - Premultiplied alpha Multiply blending
// - No depth, no backface culling, no fog.
// - ShadowCaster pass
Shader "Spine/Blend Modes/Skeleton PMA Multiply" {
Properties {
_Color ("Tint Color", Color) = (1,1,1,1)
_Black("Dark Color", Color) = (0,0,0,0)
[NoScaleOffset] _MainTex ("MainTex", 2D) = "black" {}
[Toggle(_STRAIGHT_ALPHA_INPUT)] _StraightAlphaInput("Straight Alpha Texture", Int) = 0
_Cutoff ("Shadow alpha cutoff", Range(0,1)) = 0.1
[HideInInspector] _StencilRef("Stencil Reference", Float) = 1.0
[HideInInspector][Enum(UnityEngine.Rendering.CompareFunction)] _StencilComp("Stencil Comparison", Float) = 8 // Set to Always as default
// Outline properties are drawn via custom editor.
[HideInInspector] _OutlineWidth("Outline Width", Range(0,8)) = 3.0
[HideInInspector] _OutlineColor("Outline Color", Color) = (1,1,0,1)
[HideInInspector] _OutlineReferenceTexWidth("Reference Texture Width", Int) = 1024
[HideInInspector] _ThresholdEnd("Outline Threshold", Range(0,1)) = 0.25
[HideInInspector] _OutlineSmoothness("Outline Smoothness", Range(0,1)) = 1.0
[HideInInspector][MaterialToggle(_USE8NEIGHBOURHOOD_ON)] _Use8Neighbourhood("Sample 8 Neighbours", Float) = 1
[HideInInspector] _OutlineMipLevel("Outline Mip Level", Range(0,3)) = 0
}
SubShader {
Tags { "Queue"="Transparent" "IgnoreProjector"="True" "RenderType"="Transparent" }
LOD 100
Fog { Mode Off }
Cull Off
ZWrite Off
Blend DstColor OneMinusSrcAlpha
Lighting Off
Stencil {
Ref[_StencilRef]
Comp[_StencilComp]
Pass Keep
}
Pass {
Name "Normal"
CGPROGRAM
#pragma shader_feature _ _STRAIGHT_ALPHA_INPUT
#pragma vertex vert
#pragma fragment frag
#include "UnityCG.cginc"
uniform sampler2D _MainTex;
uniform float4 _Color;
uniform float4 _Black;
struct VertexInput {
float4 vertex : POSITION;
float2 uv : TEXCOORD0;
float4 vertexColor : COLOR;
};
struct VertexOutput {
float4 pos : SV_POSITION;
float2 uv : TEXCOORD0;
float4 vertexColor : COLOR;
};
VertexOutput vert (VertexInput v) {
VertexOutput o;
o.pos = UnityObjectToClipPos(v.vertex);
o.uv = v.uv;
o.vertexColor = v.vertexColor * float4(_Color.rgb * _Color.a, _Color.a); // Combine a PMA version of _Color with vertexColor.
return o;
}
float4 frag (VertexOutput i) : SV_Target {
float4 texColor = tex2D(_MainTex, i.uv);
#if defined(_STRAIGHT_ALPHA_INPUT)
texColor.rgb *= texColor.a;
#endif
return fragTintedColor(texColor, _Black.rgb, i.vertexColor, _Color.a, _Black.a);
//return (texColor * i.vertexColor);
}
ENDCG
}
Pass {
Name "Caster"
Tags { "LightMode"="ShadowCaster" }
Offset 1, 1
ZWrite On
ZTest LEqual
CGPROGRAM
#pragma vertex vert
#pragma fragment frag
#pragma multi_compile_shadowcaster
#pragma fragmentoption ARB_precision_hint_fastest
#include "UnityCG.cginc"
struct v2f {
V2F_SHADOW_CASTER;
float4 uvAndAlpha : TEXCOORD1;
};
uniform float4 _MainTex_ST;
v2f vert (appdata_base v, float4 vertexColor : COLOR) {
v2f o;
TRANSFER_SHADOW_CASTER(o)
o.uvAndAlpha.xy = TRANSFORM_TEX(v.texcoord, _MainTex);
o.uvAndAlpha.z = 0;
o.uvAndAlpha.a = vertexColor.a;
return o;
}
uniform sampler2D _MainTex;
uniform fixed _Cutoff;
float4 frag (v2f i) : SV_Target {
fixed4 texcol = tex2D(_MainTex, i.uvAndAlpha.xy);
clip(texcol.a * i.uvAndAlpha.a - _Cutoff);
SHADOW_CASTER_FRAGMENT(i)
}
ENDCG
}
}
CustomEditor "SpineShaderWithOutlineGUI"
}
