http://blog.csdn.net/a3070173/archive/2008/11/20/3342062.aspx

1. Dislace Mapping其实就是在顶点着色器中
2. 对顶点进行置换偏移,经常用于水仿真流体绘制.
4. 顶点着色器:
5. uniform float g_fScale;
6. uniform sampler2D g_DisplaceTexture;
8. void main()
9. {
10.     float fDisplace = texture2DLod(g_DisplaceTexture, gl_MultiTexCoord0.st, 0.0).r;
11.     vec4 vec4NewVertex = vec4(gl_Vertex.x, gl_Vertex.y + g_fScale*fDisplace, gl_Vertex.zw);
12.     
13.     gl_TexCoord[0] = gl_MultiTexCoord0;
14.     gl_Position = gl_ModelViewProjectionMatrix*vec4NewVertex;
15. }
17. 片元着色器:
18. uniform sampler2D g_DecalTexture;
20. void main()
21. {
22.     gl_FragColor = texture2D(g_DecalTexture, gl_TexCoord[0].st);
23. }
25. Demo效果截图:
26. 
27. exe文件:http://www.fileupyours.com/view/219112/GLSL/Simple%20Displace%20Mapping.rar
28. VC9运行库:http://www.fileupyours.com/view/219112/GLSL/VC9%26%2336816%3B%26%2334892%3B%26%2326102%3B%26%2324211%3B.rar