mirror of
https://github.com/NVIDIA/cuda-samples.git
synced 2024-11-28 14:59:19 +08:00
110 lines
5.3 KiB
C
110 lines
5.3 KiB
C
/* Copyright (c) 2021, 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.
|
|
*/
|
|
|
|
#ifndef __STABLEFLUIDS_KERNELS_H_
|
|
#define __STABLEFLUIDS_KERNELS_H_
|
|
|
|
#define DIM 512 // Square size of solver domain
|
|
#define DS (DIM * DIM) // Total domain size
|
|
#define CPADW (DIM / 2 + 1) // Padded width for real->complex in-place FFT
|
|
#define RPADW \
|
|
(2 * (DIM / 2 + 1)) // Padded width for real->complex in-place FFT
|
|
#define PDS (DIM * CPADW) // Padded total domain size
|
|
|
|
#define DT 0.09f // Delta T for interative solver
|
|
#define VIS 0.0025f // Viscosity constant
|
|
#define FORCE (5.8f * DIM) // Force scale factor
|
|
#define FR 4 // Force update radius
|
|
|
|
#define TILEX 64 // Tile width
|
|
#define TILEY 64 // Tile height
|
|
#define TIDSX 64 // Tids in X
|
|
#define TIDSY 4 // Tids in Y
|
|
|
|
typedef unsigned long DWORD;
|
|
|
|
typedef struct vertex {
|
|
float x, y, z;
|
|
DWORD c;
|
|
} Vertex;
|
|
|
|
// Vector data type used to velocity and force fields
|
|
typedef float2 cData;
|
|
|
|
extern "C" void setupTexture(int x, int y);
|
|
extern "C" void updateTexture(cData *data, size_t w, size_t h, size_t pitch);
|
|
extern "C" void deleteTexture(void);
|
|
|
|
// This method adds constant force vectors to the velocity field
|
|
// stored in 'v' according to v(x,t+1) = v(x,t) + dt * f.
|
|
__global__ void addForces_k(cData *v, int dx, int dy, int spx, int spy,
|
|
float fx, float fy, int r, size_t pitch);
|
|
|
|
// This method performs the velocity advection step, where we
|
|
// trace velocity vectors back in time to update each grid cell.
|
|
// That is, v(x,t+1) = v(p(x,-dt),t). Here we perform bilinear
|
|
// interpolation in the velocity space.
|
|
__global__ void advectVelocity_k(cData *v, float *vx, float *vy, int dx,
|
|
int pdx, int dy, float dt, int lb,
|
|
cudaTextureObject_t tex);
|
|
|
|
// This method performs velocity diffusion and forces mass conservation
|
|
// in the frequency domain. The inputs 'vx' and 'vy' are complex-valued
|
|
// arrays holding the Fourier coefficients of the velocity field in
|
|
// X and Y. Diffusion in this space takes a simple form described as:
|
|
// v(k,t) = v(k,t) / (1 + visc * dt * k^2), where visc is the viscosity,
|
|
// and k is the wavenumber. The projection step forces the Fourier
|
|
// velocity vectors to be orthogonal to the wave wave vectors for each
|
|
// wavenumber: v(k,t) = v(k,t) - ((k dot v(k,t) * k) / k^2.
|
|
__global__ void diffuseProject_k(cData *vx, cData *vy, int dx, int dy, float dt,
|
|
float visc, int lb);
|
|
|
|
// This method updates the velocity field 'v' using the two complex
|
|
// arrays from the previous step: 'vx' and 'vy'. Here we scale the
|
|
// real components by 1/(dx*dy) to account for an unnormalized FFT.
|
|
__global__ void updateVelocity_k(cData *v, float *vx, float *vy, int dx,
|
|
int pdx, int dy, int lb, size_t pitch);
|
|
|
|
// This method updates the particles by moving particle positions
|
|
// according to the velocity field and time step. That is, for each
|
|
// particle: p(t+1) = p(t) + dt * v(p(t)).
|
|
__global__ void advectParticles_k(Vertex *part, cData *v, int dx, int dy,
|
|
float dt, int lb, size_t pitch);
|
|
|
|
extern "C" void addForces(cData *v, int dx, int dy, int spx, int spy, float fx,
|
|
float fy, int r, size_t tPitch);
|
|
extern "C" void advectVelocity(cData *v, float *vx, float *vy, int dx, int pdx,
|
|
int dy, float dt, size_t tPitch);
|
|
extern "C" void diffuseProject(cData *vx, cData *vy, int dx, int dy, float dt,
|
|
float visc, size_t tPitch);
|
|
extern "C" void updateVelocity(cData *v, float *vx, float *vy, int dx, int pdx,
|
|
int dy, size_t tPitch);
|
|
extern "C" void advectParticles(Vertex *p, cData *v, int dx, int dy, float dt,
|
|
size_t tPitch);
|
|
|
|
#endif
|