중국 애들이 만든걸 주워옴
Shader "ParticlesAdditiveAreaClip"
{
Properties
{
_TintColor ("Tint Color", Color) = (0.5,0.5,0.5,0.5)
_MainTex ("Particle Texture", 2D) = "white" {}
_Area ("Area", Vector) = (0,0,1,1)
}
Category
{
Tags { "Queue"="Transparent" "IgnoreProjector"="True" "RenderType"="Transparent" }
Blend SrcAlpha One
AlphaTest Greater .01
ColorMask RGB
Cull Off
Lighting Off
ZWrite Off
Fog { Color (0,0,0,0) }
SubShader
{
Pass
{
CGPROGRAM
#pragma vertex vert
#pragma fragment frag
#pragma multi_compile_particles
#include "UnityCG.cginc"
sampler2D _MainTex;
fixed4 _TintColor;
float4 _Area;
struct appdata_t
{
float4 vertex : POSITION;
fixed4 color : COLOR;
float2 texcoord : TEXCOORD0;
};
struct v2f
{
float4 vertex : SV_POSITION;
fixed4 color : COLOR;
float2 texcoord : TEXCOORD0;
float2 worldPos : TEXCOORD1;
};
float4 _MainTex_ST;
v2f vert (appdata_t v)
{
v2f o;
o.vertex = UnityObjectToClipPos(v.vertex);
o.texcoord = TRANSFORM_TEX(v.texcoord,_MainTex);
o.color = v.color;
o.worldPos = mul(unity_ObjectToWorld, v.vertex).xy;
return o;
}
fixed4 frag (v2f i) : SV_Target
{
bool inArea = i.worldPos.x >= _Area.x && i.worldPos.x <= _Area.z && i.worldPos.y >= _Area.y && i.worldPos.y <= _Area.w;
return inArea? 2.0f * i.color * _TintColor * tex2D(_MainTex, i.texcoord) : fixed4(0,0,0,0);
}
ENDCG
}
}
}
}
using System;
using UnityEngine;
[RequireComponent(typeof(UIPanel))]
public class CustomUIClipper : MonoBehaviour
{
private const string ShaderName = "ParticlesAdditiveAreaClip";
private const float ClipInterval = 0.5f;
private UIPanel m_targetPanel;
private Shader m_shader;
private void Start()
{
// find panel
m_targetPanel = GetComponent<uipanel>();
if (m_targetPanel == null)
throw new ArgumentNullException("Cann't find the right UIPanel");
if (m_targetPanel.clipping != UIDrawCall.Clipping.SoftClip)
throw new InvalidOperationException("Don't need to clip");
m_shader = Shader.Find(ShaderName);
//if (!IsInvoking("Clip"))
// InvokeRepeating("Clip", 0, ClipInterval);
Clip();
}
private Vector4 CalcClipArea()
{
var clipRegion = m_targetPanel.finalClipRegion;
var nguiArea = new Vector4()
{
x = clipRegion.x - clipRegion.z / 2,
y = clipRegion.y - clipRegion.w / 2,
z = clipRegion.x + clipRegion.z / 2,
w = clipRegion.y + clipRegion.w / 2
};
var uiRoot = m_targetPanel.root;
var pos = m_targetPanel.transform.position;
var rate1 = (float)Screen.width / (float)Screen.height;
var rate2 = (float)uiRoot.manualWidth / (float)uiRoot.manualHeight;
const float h = 2f;
var w = h * rate1;
var tempH = h / uiRoot.manualHeight;
var tempW = w / uiRoot.manualWidth;
var tempRate = Mathf.Max(tempW, tempH);
if (rate1 < rate2)
{
tempRate = Mathf.Min(tempW, tempH);
}
var result = new Vector4()
{
x = pos.x + nguiArea.x * tempRate,
y = pos.y + nguiArea.y * tempRate,
z = pos.x + nguiArea.z * tempRate,
w = pos.y + nguiArea.w * tempRate
};
return result;
}
private void Clip()
{
var clipArea = CalcClipArea();
var renderers = GetComponentsInChildren<renderer>();
for (var i = 0; i < renderers.Length; ++i)
{
var mat = renderers[i].material;
if (mat.shader.name != ShaderName)
mat.shader = m_shader;
mat.SetVector("_Area", clipArea);
}
}
}
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