Cg入门23: Fragment shader – UV动画(序列帧)
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让动画从1-9循环播放此纹理
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源代码:
Shader "Sbin/FragmentAnim" { Properties { _MainTex ("Texture", 2D) = "white" {} } SubShader { Pass { CGPROGRAM #pragma vertex vert #pragma fragment frag #include "UnityCG.cginc" sampler2D _MainTex; float4 _MainTex_ST;//纹理缩放偏移向量(Unity默认此变量赋值,变量名规则:纹理名_ST) struct v2f{ float4 pos:POSITION; float2 uv:TEXCOORD0; }; v2f vert (appdata_full v) { v2f o; o.pos = mul(UNITY_MATRIX_MVP, v.vertex); o.uv = v.texcoord.xy * _MainTex_ST.xy + _MainTex_ST.zw; return o; } fixed4 frag (v2f v) : COLOR { fixed4 col = tex2D(_MainTex, v.uv);//第一个参数:纹理,第二个参数UV向量 return col; } ENDCG } } }
using UnityEngine; using System.Collections; public class FragmentAnim : MonoBehaviour { public int rowCount; //行数 public int columCount; //列数 public int fps; //播放速度 private int currentIndex;//当前播放索引值 IEnumerator Start() { Material mat = GetComponent<Renderer>().material; float itemWidth = 1.0f / rowCount; //每一帧宽度 float itemHeight = 1.0f / columCount; //每一帧高度 while (true) { float offset_x = currentIndex % columCount * itemWidth; float offset_y = currentIndex / rowCount * itemHeight; mat.SetTextureScale("_MainTex", new Vector2(itemWidth, itemHeight)); mat.SetTextureOffset("_MainTex", new Vector2(offset_x, offset_y)); yield return new WaitForSeconds(1 / fps); currentIndex = (++currentIndex) % (rowCount * columCount); } } }
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