移动端水面Shader实现：简单易懂的代码示例

以下是一个移动端可以使用的水面shader的示例代码：

Shader "Custom/WaterShader" {
    Properties {
        _MainTex ("Texture", 2D) = "white" {}
        _NormalMap ("Normal Map", 2D) = "bump" {}
        _WaveSpeed ("Wave Speed", Range(0, 1)) = 0.5
        _WaveStrength ("Wave Strength", Range(0, 1)) = 0.1
    }

    SubShader {
        Tags {'Queue'='Transparent' 'RenderType'='Transparent'}
        LOD 100

        CGPROGRAM
        #pragma surface surf Lambert alpha

        sampler2D _MainTex;
        sampler2D _NormalMap;
        float _WaveSpeed;
        float _WaveStrength;

        struct Input {
            float2 uv_MainTex;
        };

        void surf (Input IN, inout SurfaceOutputAlpha o) {
            fixed4 c = tex2D (_MainTex, IN.uv_MainTex);
            o.Alpha = c.a;

            // Calculate wave displacement
            float2 waveOffset = IN.uv_MainTex * _WaveSpeed;
            float2 waveDisplacement = tex2D (_NormalMap, waveOffset).rg * _WaveStrength;

            // Apply wave displacement to the vertex position
            float3 vertexPos = UnityObjectToClipPos(IN.uv_MainTex.xy);
            vertexPos.x += waveDisplacement.x;
            vertexPos.z += waveDisplacement.y;
            o.Alpha *= smoothstep(0.98, 1, vertexPos.y); // Fade out the waves near the horizon

            // Set the final vertex position
            o.Alpha *= vertexPos.y; // Adjust the transparency based on height
            o.Alpha *= 1 - length(waveDisplacement); // Fade out the waves at the edges

            // Set the final color
            o.Albedo = c.rgb;
        }
        ENDCG
    }

    FallBack "Diffuse"
}

注意：上述代码是一个简单的水面shader示例，仅实现了基本的水波效果，可能不够真实。你可以根据需要进行调整和优化。