[Compute] Sending a struct with some data

Good morning/night everyone,

This week I´ve been working on Gerstner simulation (ocean waves). I have the basic algorithm working on the CPU but I would like to spice things up moving it to the GPU using compute (it is the first time I use compute xD).

The idea is to send a struct to the GPU containing some data like time,waves properties etc

The following is the declaration of the structs in the shader:

Code (csharp):

1.  
2. // Size 24
3. struct WaveProperties
4. {
5.     float chopy;
6.     float A;
7.     float2 D;
8.     float L;
9.     float s;
10. };
11.  
12. // Size 24 * 8 + 8 = 200
13. struct WaveSimulation
14. {
15.     WaveProperties waves[8];
16.     float time;
17.     float numWaves;
18. };
19. //...
20. RWStructuredBuffer<WaveSimulation> WavesConstants;
21. RWTexture2D<float4> HeightOutput;
22.  

... this is in the CPU

Code (csharp):

1.  
2. public struct Vec2
3. {
4.     public float x;
5.     public float y;
6.     public Vec2(float x_,float y_)
7.     {
8.         x = x_;
9.         y = y_;
10.     }
11. };
12.  
13. public struct WaveProperties
14. {
15.     public float chopy;    // The actual parametizable value
16.     public float A;        // Amplitude
17.     public Vec2 D;         // Wave direction
18.     public float L;        // Distance crest to crest
19.     public float s;        // speed m/s
20. };
21.  
22. struct WaveSimulation
23. {
24.     public WaveProperties[] waves;
25.     public float time;
26.     public float numWaves;
27. };
28.  

I did my own vec2 class just in case unity hides some extra data. I also don´t know if the WaveProperties[] array in C# can cause me trouble.

I set the buffer like this:

Code (csharp):

1.  
2.         mWaveSimulation.time = 0.5f;
3.         mWaveSimulation.numWaves = mWaves.Count;
4.         mWaveSimulation.waves = new WaveProperties[mWaves.Count];
5.         mWaves.CopyTo(mWaveSimulation.waves);
6.         mWavesBuffer = new ComputeBuffer(1, 200);
7.         mWavesBuffer.SetData(new[] { mWaveSimulation });
8.  

Well, the problem is that the values that I´m getting are all 0/NaN

Any ideas? Thanks!

 

Alright, so instead of trying to mix both the "general info" buffer and the "waves" buffer, now I have two buffers. I did some testing and checks because previously I was misunderstanding some concepts. So far so good, now I think I have all the data I need in the shader! I'll do some tests and actually contrast the GPU result with the CPU one.

I will keep updating this post for other people in the future

Thanks.