mirror of
https://github.com/NVIDIA/cuda-samples.git
synced 2024-11-24 22:19:18 +08:00
111 lines
3.6 KiB
Plaintext
111 lines
3.6 KiB
Plaintext
/* Copyright (c) 2022, NVIDIA CORPORATION. All rights reserved.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
* * Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* * Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
* documentation and/or other materials provided with the distribution.
|
|
* * Neither the name of NVIDIA CORPORATION nor the names of its
|
|
* contributors may be used to endorse or promote products derived
|
|
* from this software without specific prior written permission.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS ``AS IS'' AND ANY
|
|
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
|
|
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
|
|
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
|
|
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
|
|
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
|
|
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
|
|
* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
|
|
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
|
|
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
|
|
*/
|
|
|
|
/*
|
|
* CUDA Device code for particle simulation.
|
|
*/
|
|
|
|
#ifndef _PARTICLES_KERNEL_H_
|
|
#define _PARTICLES_KERNEL_H_
|
|
|
|
#include "helper_math.h"
|
|
#include "math_constants.h"
|
|
#include "particles_kernel.cuh"
|
|
|
|
cudaTextureObject_t noiseTex;
|
|
// simulation parameters
|
|
__constant__ SimParams params;
|
|
|
|
// look up in 3D noise texture
|
|
__device__ float3 noise3D(float3 p, cudaTextureObject_t noiseTex) {
|
|
float4 n = tex3D<float4>(noiseTex, p.x, p.y, p.z);
|
|
return make_float3(n.x, n.y, n.z);
|
|
}
|
|
|
|
// integrate particle attributes
|
|
struct integrate_functor {
|
|
float deltaTime;
|
|
cudaTextureObject_t noiseTex;
|
|
|
|
__host__ __device__ integrate_functor(float delta_time,
|
|
cudaTextureObject_t noise_Tex)
|
|
: deltaTime(delta_time), noiseTex(noise_Tex) {}
|
|
|
|
template <typename Tuple>
|
|
__device__ void operator()(Tuple t) {
|
|
volatile float4 posData = thrust::get<2>(t);
|
|
volatile float4 velData = thrust::get<3>(t);
|
|
|
|
float3 pos = make_float3(posData.x, posData.y, posData.z);
|
|
float3 vel = make_float3(velData.x, velData.y, velData.z);
|
|
|
|
// update particle age
|
|
float age = posData.w;
|
|
float lifetime = velData.w;
|
|
|
|
if (age < lifetime) {
|
|
age += deltaTime;
|
|
} else {
|
|
age = lifetime;
|
|
}
|
|
|
|
// apply accelerations
|
|
vel += params.gravity * deltaTime;
|
|
|
|
// apply procedural noise
|
|
float3 noise = noise3D(
|
|
pos * params.noiseFreq + params.time * params.noiseSpeed, noiseTex);
|
|
vel += noise * params.noiseAmp;
|
|
|
|
// new position = old position + velocity * deltaTime
|
|
pos += vel * deltaTime;
|
|
|
|
vel *= params.globalDamping;
|
|
|
|
// store new position and velocity
|
|
thrust::get<0>(t) = make_float4(pos, age);
|
|
thrust::get<1>(t) = make_float4(vel, velData.w);
|
|
}
|
|
};
|
|
|
|
struct calcDepth_functor {
|
|
float3 sortVector;
|
|
|
|
__host__ __device__ calcDepth_functor(float3 sort_vector)
|
|
: sortVector(sort_vector) {}
|
|
|
|
template <typename Tuple>
|
|
__host__ __device__ void operator()(Tuple t) {
|
|
volatile float4 p = thrust::get<0>(t);
|
|
float key = -dot(make_float3(p.x, p.y, p.z),
|
|
sortVector); // project onto sort vector
|
|
thrust::get<1>(t) = key;
|
|
}
|
|
};
|
|
|
|
#endif
|