/// <summary>
/// 初期化
/// </summary>
protected virtual void Initialize()
{
particleNum = (particleMax / THREAD_NUM_X) * THREAD_NUM_X;
emitNum = (emitMax / THREAD_NUM_X) * THREAD_NUM_X;
//Debug.Log("particleNum " + particleNum + " emitNum " + emitNum + " THREAD_NUM_X " + THREAD_NUM_X);
particleBuffer = new ComputeBuffer(particleNum, Marshal.SizeOf(typeof(T)), ComputeBufferType.Default);
particleActiveBuffer = new ComputeBuffer(particleNum, Marshal.SizeOf(typeof(int)), ComputeBufferType.Append);
particleActiveBuffer.SetCounterValue(0);
particlePoolBuffer = new ComputeBuffer(particleNum, Marshal.SizeOf(typeof(int)), ComputeBufferType.Append);
particlePoolBuffer.SetCounterValue(0);
particleActiveCountBuffer = new ComputeBuffer(4, Marshal.SizeOf(typeof(int)), ComputeBufferType.IndirectArguments);
particlePoolCountBuffer = new ComputeBuffer(4, Marshal.SizeOf(typeof(int)), ComputeBufferType.IndirectArguments);
particlePoolCountBuffer.SetData(particleCounts);
initKernel = cs.FindKernel("Init");
emitKernel = cs.FindKernel("Emit");
updateKernel = cs.FindKernel("Update");
cspropid_Particles = ShaderDefines.GetBufferPropertyID(ShaderDefines.BufferID._Particles);
cspropid_DeadList = ShaderDefines.GetBufferPropertyID(ShaderDefines.BufferID._DeadList);
cspropid_ActiveList = ShaderDefines.GetBufferPropertyID(ShaderDefines.BufferID._ActiveList);
cspropid_ParticlePool = ShaderDefines.GetBufferPropertyID(ShaderDefines.BufferID._ParticlePool);
cspropid_EmitNum = ShaderDefines.GetIntPropertyID(ShaderDefines.IntID._EmitNum);
//Debug.Log("initKernel " + initKernel + " emitKernel " + emitKernel + " updateKernel " + updateKernel);
cs.SetBuffer(initKernel, cspropid_Particles, particleBuffer);
cs.SetBuffer(initKernel, cspropid_DeadList, particlePoolBuffer);
cs.Dispatch(initKernel, particleNum / THREAD_NUM_X, 1, 1);
isInitialized = true;
}
// 地形描画
void RenderTerrain()
{
// テクスチャを設定
_shaderMaterial.SetTexture(ShaderDefines.GetTexturePropertyID(ShaderDefines.TextureID._mainTexture), _texture);
// 変数を設定
_shaderMaterial.SetInt(ShaderDefines.GetIntPropertyID(ShaderDefines.IntID._numVertices), _numVertices);
_shaderMaterial.SetFloat(ShaderDefines.GetFloatPropertyID(ShaderDefines.FloatID._height), _height);
// バッファの設定
_shaderMaterial.SetBuffer(ShaderDefines.GetBufferPropertyID(ShaderDefines.BufferID._verticesBuffer), m_verticesBuffer);
// 描画処理
Graphics.DrawMeshInstancedIndirect(_mesh, 0, _shaderMaterial, new Bounds(Vector3.zero, new Vector3(1000.0f, 1000.0f, 1000.0f)), m_argsBuffer);
}
// 頂点の計算
void CalculateVertex()
{
// バッファを設定
_computeShader.SetBuffer(m_calculateKernel, ShaderDefines.GetBufferPropertyID(ShaderDefines.BufferID._verticesBuffer), m_verticesBuffer);
// 変数を設定
_computeShader.SetFloat(ShaderDefines.GetFloatPropertyID(ShaderDefines.FloatID._fieldSize), FIELD_SIZE);
_computeShader.SetInt(ShaderDefines.GetIntPropertyID(ShaderDefines.IntID._numVertices), _numVertices);
_computeShader.SetFloat(ShaderDefines.GetFloatPropertyID(ShaderDefines.FloatID._distance), m_distance);
_computeShader.SetFloat(ShaderDefines.GetFloatPropertyID(ShaderDefines.FloatID._height), _height);
_computeShader.SetFloat(ShaderDefines.GetFloatPropertyID(ShaderDefines.FloatID._smoothness), _smoothness * _numVertices);
_computeShader.SetVector(ShaderDefines.GetVectorPropertyID(ShaderDefines.VectorID._offset), new Vector2(_offsetX, _offsetY));
// カーネルの実行
_computeShader.Dispatch(m_calculateKernel, m_numThreadGroups, 1, m_numThreadGroups);
}
// 更新処理
public void Update(ComputeShader _computeShader, Camera _camera, int _numParticles, ComputeBuffer _particlesBuffer, ComputeBuffer _activeParticlesBuffer)
{
// 視錘台カリングを行うカーネル
int kernel = _computeShader.FindKernel("FrustumCulling");
// 視錘台の計算
CalculateFrustumPlanes(_camera.projectionMatrix * _camera.worldToCameraMatrix, ref m_planes);
// 視錘台の法線を分解
for (int i = 0; i < 4; i++)
{
Debug.DrawRay(_camera.transform.position, m_planes[i].normal * 10f, Color.yellow);
m_normalsFloat[i + 0] = m_planes[i].normal.x;
m_normalsFloat[i + 4] = m_planes[i].normal.y;
m_normalsFloat[i + 8] = m_planes[i].normal.z;
}
// バッファのカウンターをリセット
m_inViewParticlesBuffer.SetCounterValue(0);
// カメラの座標
Vector3 cameraPosition = _camera.transform.position;
// 変数を設定
_computeShader.SetInt(ShaderDefines.GetIntPropertyID(ShaderDefines.IntID._numParticles), _numParticles);
_computeShader.SetFloats(ShaderDefines.GetVectorPropertyID(ShaderDefines.VectorID._cameraPosition), cameraPosition.x, cameraPosition.y, cameraPosition.z);
_computeShader.SetFloats(ShaderDefines.GetVectorPropertyID(ShaderDefines.VectorID._cameraFrustumNormals), m_normalsFloat);
// バッファを設定
_computeShader.SetBuffer(kernel, ShaderDefines.GetBufferPropertyID(ShaderDefines.BufferID._particlesBuffer), _particlesBuffer);
_computeShader.SetBuffer(kernel, ShaderDefines.GetBufferPropertyID(ShaderDefines.BufferID._activeParticlesBuffer), _activeParticlesBuffer);
_computeShader.SetBuffer(kernel, ShaderDefines.GetBufferPropertyID(ShaderDefines.BufferID._inViewParticlesBuffer), m_inViewParticlesBuffer);
// カーネルを実行
_computeShader.Dispatch(kernel, Mathf.CeilToInt((float)_activeParticlesBuffer.count / NUM_THREAD_X), 1, 1);
// バッファにデータを渡す
m_inViewCountsBuffer.SetData(m_inViewCounts);
// 視界内のパーティクル数を取得
ComputeBuffer.CopyCount(m_inViewParticlesBuffer, m_inViewCountsBuffer, 4);
}