////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
// --- GrassComponent ---
private void Initialize(Grass grass)
{
//Init shaders
grass.ComputeShader = Instantiate(ComputeShader);
// Init kernels
grass.MeshGrassGeneratorKernel = new ComputeKernel(_meshGrassGeneratorKernelName, grass.ComputeShader);
grass.IndirectGrassKernel = new ComputeKernel(_indirectGrassKernelName, grass.ComputeShader);
grass.CullKernal = new ComputeKernel(_cullKernelName, grass.ComputeShader);
var maxGrassMesh = (int)Mathf.Ceil((grass.SurfaceMesh.bounds.size.x * grass.SurfaceMesh.bounds.size.z) / GrassDensity);
grass.MaxGrass = maxGrassMesh;
grass.GrassBuffer = new ComputeBuffer(grass.MaxGrass, sizeof(float) * 4, ComputeBufferType.Append);
var surfaceVertices = grass.SurfaceMesh.vertices;
var surfaceIndices = grass.SurfaceMesh.GetIndices(0);
var surfaceUVs = grass.SurfaceMesh.uv;
grass.SurfaceVertices = new ComputeBuffer(surfaceVertices.Length, sizeof(float) * 3, ComputeBufferType.Default);
grass.SurfaceIndices = new ComputeBuffer(surfaceIndices.Length, sizeof(int), ComputeBufferType.Default);
grass.SurfaceUVs = new ComputeBuffer(surfaceUVs.Length, sizeof(float) * 2, ComputeBufferType.Default);
grass.ComputeShader.SetInt(ComputeShaderID.cullCount, grass.MaxGrass);
grass.ComputeShader.SetInt(ComputeShaderID.indexCount, surfaceIndices.Length);
// fill surface vertices
grass.SurfaceVertices.SetData(surfaceVertices);
grass.MeshGrassGeneratorKernel.SetBuffer(ComputeShaderID.surfaceVertices, grass.SurfaceVertices);
grass.SurfaceIndices.SetData(surfaceIndices);
grass.MeshGrassGeneratorKernel.SetBuffer(ComputeShaderID.surfaceIndices, grass.SurfaceIndices);
grass.SurfaceUVs.SetData(surfaceUVs);
grass.MeshGrassGeneratorKernel.SetBuffer(ComputeShaderID.surfaceUVs, grass.SurfaceUVs);
}
private void SafeRelease(Grass grass)
{
grass.GrassBuffer.SafeRelease();
Destroy(grass.ComputeShader);
grass.SurfaceVertices.SafeRelease();
grass.SurfaceIndices.SafeRelease();
grass.SurfaceUVs.SafeRelease();
}
private void UpdateShaderValues(Grass grass)
{
grass.ComputeShader.SetInt(ComputeShaderID.terrainResolution, grass.SplatMap.height);
grass.ComputeShader.SetMatrix(ComputeShaderID.objToWorld, grass.GameObject.transform.localToWorldMatrix);
grass.ComputeShader.SetFloat(ComputeShaderID.surfaceGridStep, GrassDensity);
grass.MeshGrassGeneratorKernel.SetTexture(ComputeShaderID.splatMap, grass.SplatMap);
grass.MeshGrassGeneratorKernel.SetTexture(ComputeShaderID.nodeTexture, grass.NodeTexture);
grass.CullKernal.SetBuffer(ComputeShaderID.cullOutBuffer, _megaBuffer);
}
////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
public void AddGrass(GameObject go)
{
var _mesh = go.GetComponent <MeshFilter>().mesh;
var _texture = go.GetComponent <MeshRenderer>().material.mainTexture;
Grass grass = new Grass
{
ID = Guid.NewGuid(),
GameObject = go,
SurfaceMesh = _mesh,
SplatMap = DefaultSplatMap,
NodeTexture = (Texture2D)_texture
};
Initialize(grass);
//add grass to list
_drawGrass.Add(grass);
}
private void UpdatePlanePos(Grass grass)
{
grass.ComputeShader.SetVectorArray(ComputeShaderID.frustumPlanes, _frustumPlanes);
}
