Cg入门23： Fragment shader – UV动画（序列帧）

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);//第一个參数：纹理。第二个參数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);
}
}
}