UnityShader 序列帧动画效果

 1 Shader "unilt/SceneRainSplash" {
 2     Properties {
 3         _MainTex ("Base (RGB)", 2D) = "white" {}               //序列帧动画纹理  
 4         _Color("Color Tint", Color) = (1, 1, 1, 1)            //颜色
 5         _HorizontalAmount("Horizontal Amount", float) = 6        // 行数
 6         _VerticalAmount("Vertical Amount", float) = 1            // 列数 
 7         _Speed("Speed", Range(1, 100)) = 7                     // 播放速度 
 8     }
 9     
10     CGINCLUDE
11 
12         #include "UnityCG.cginc"
13 
14         sampler2D _MainTex;
15         
16         uniform half4 _MainTex_ST;
17         uniform fixed4 _Color;
18         uniform float _HorizontalAmount;
19         uniform float _VerticalAmount;
20         uniform float _Speed;
21 
22         struct appdata
23         {
24             float4 vertex : POSITION;   //从形似寄存器中读取顶点坐标
25             float2 uv : TEXCOORD0;      //从形似寄存器中读取uv坐标信息
26         };
27         
28 
29         struct v2f
30         {
31             float2 uv : TEXCOORD0;
32             float4 vertex : SV_POSITION;
33         };
34 
35         v2f vert(appdata v)
36         {
37             v2f o;
38             
39             //mul(UNITY_MATRIX_MVP,*)‘ == ‘UnityObjectToClipPos(*) 
40             //（物体的模型到世界矩阵 * 从世界到摄像机的矩阵 * 投影的矩阵 ）
41             o.vertex = UnityObjectToClipPos(v.vertex);
42             
43             //TRANSFORM_TEX,就是将模型顶点的uv和Tiling、offset两个变量进行计算得出实际显示用的定点uv
44             o.uv = TRANSFORM_TEX(v.uv, _MainTex);
45             
46             return o; 
47         }
48         
49         fixed4 frag(v2f i) : SV_Target
50         {    
51             //所经过的时间,Unity内置变量_Timefloat4 _Time : Time (t/20, t, t*2, t*3)
52             float time = floor(_Time.y * _Speed);
53             //该时间渲染序列帧动画指定的行列
54             float row = floor(time / _HorizontalAmount);
55             float col = time - row * _HorizontalAmount;
56 
57             //将所显示的单张图片缩放到应有的大小区域
58             half2 uv = float2(i.uv.x / _HorizontalAmount, i.uv.y / _VerticalAmount);
59             //移动到对应缩放后的区域位置
60             uv.x += col / _HorizontalAmount;
61             uv.y -= row / _VerticalAmount;
62             fixed4 color = tex2D(_MainTex, uv);
63             color.rgb *= _Color.rgb;
64             return color;
65         }
66     
67     ENDCG
68     
69     SubShader {
70         Tags { "Queue" = "Transparent" }
71         Cull Off
72         ZWrite Off
73         Blend One OneMinusSrcColor
74 
75     Pass {
76     
77         CGPROGRAM
78         
79         #pragma vertex vert
80         #pragma fragment frag
81         #pragma fragmentoption ARB_precision_hint_fastest 
82         
83         ENDCG
84          
85         }
86                 
87     } 
88     FallBack Off
89 }