GLSL实现Simple Displace Mapping 水仿真流体绘制 【转】

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.
3. 顶点着色器:
4. uniform float g_fScale;
5. uniform sampler2D g_DisplaceTexture;
6. void main()
7. {
8. float fDisplace = texture2DLod(g_DisplaceTexture, gl_MultiTexCoord0.st, 0.0).r;
9. vec4 vec4NewVertex = vec4(gl_Vertex.x, gl_Vertex.y + g_fScale*fDisplace, gl_Vertex.zw);
10. gl_TexCoord[0] = gl_MultiTexCoord0;
11. gl_Position = gl_ModelViewProjectionMatrix*vec4NewVertex;
12. }
13. 片元着色器:
14. uniform sampler2D g_DecalTexture;
15. void main()
16. {
17. gl_FragColor = texture2D(g_DecalTexture, gl_TexCoord[0].st);
18. }
19. Demo效果截图:
20. 
21. exe文件:http://www.fileupyours.com/view/219112/GLSL/Simple%20Displace%20Mapping.rar
22. 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