Shader multi_compile

一、新建一个Shader和一个Material

1. Shader "Custom/Multi_Compile" {
2. SubShader {
3. Pass {
4. CGPROGRAM
5. #pragma vertex vert
6. #pragma fragment frag
7. #pragma multi_compile MY_multi_1 MY_multi_2 //告诉Unity编译两个不同版本的Shader
8. #include "UnityCG.cginc"
9. struct vertOut {
10. float4 pos:SV_POSITION;
11. };
12. vertOut vert(appdata_base v)
13. {
14. vertOut o;
15. o.pos = mul(UNITY_MATRIX_MVP, v.vertex);
16. return o;
17. }
18. float4 frag(vertOut i):COLOR
19. {
20. float4 c = float4(0, 0, 0, 0);
21. #ifdef MY_multi_1
22. c = float4(0, 1, 0, 0);//输出绿色
23. #endif
24. #ifdef MY_multi_2
25. c = float4(0, 0, 1, 0);//输出蓝色
26. #endif
27. return c;
28. }
29. ENDCG
30. }
31. }
32. FallBack "Diffuse"
33. }

二、新建个Cube, 挂上脚本Multi_Compile.cs

1. using UnityEngine;
2. using System.Collections;
3.  
4. public class Multi_Compile : MonoBehaviour {
5.  
6. public bool multi_1;
7. // Use this for initialization
8. void Start () {
9. if (multi_1) {
10. Shader.EnableKeyword ("MY_multi_1");
11. Shader.DisableKeyword ("MY_multi_2");
12. } else {
13. Shader.EnableKeyword ("MY_multi_2");
14. Shader.DisableKeyword ("MY_multi_1");
15. }
16. }
17. }

运行效果，当multi_1=true时：

运行效果，当multi_1=false时：