cuda-samples/Samples/5_Domain_Specific/fluidsGL/fluidsGL.cpp

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/* Copyright (c) 2022, NVIDIA CORPORATION. All rights reserved.
2021-10-21 19:04:49 +08:00
*
* 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.
*/
// OpenGL Graphics includes
#include <helper_gl.h>
#if defined(__APPLE__) || defined(MACOSX)
#pragma clang diagnostic ignored "-Wdeprecated-declarations"
#include <GLUT/glut.h>
#ifndef glutCloseFunc
#define glutCloseFunc glutWMCloseFunc
#endif
#else
#include <GL/freeglut.h>
#endif
// Includes
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
// CUDA standard includes
#include <cuda_runtime.h>
#include <cuda_gl_interop.h>
// CUDA FFT Libraries
#include <cufft.h>
// CUDA helper functions
#include <helper_functions.h>
#include <rendercheck_gl.h>
#include <helper_cuda.h>
#include "defines.h"
#include "fluidsGL_kernels.h"
#define MAX_EPSILON_ERROR 1.0f
const char *sSDKname = "fluidsGL";
// CUDA example code that implements the frequency space version of
// Jos Stam's paper 'Stable Fluids' in 2D. This application uses the
// CUDA FFT library (CUFFT) to perform velocity diffusion and to
// force non-divergence in the velocity field at each time step. It uses
// CUDA-OpenGL interoperability to update the particle field directly
// instead of doing a copy to system memory before drawing. Texture is
// used for automatic bilinear interpolation at the velocity advection step.
void cleanup(void);
void reshape(int x, int y);
// CUFFT plan handle
cufftHandle planr2c;
cufftHandle planc2r;
static cData *vxfield = NULL;
static cData *vyfield = NULL;
cData *hvfield = NULL;
cData *dvfield = NULL;
static int wWidth = MAX(512, DIM);
static int wHeight = MAX(512, DIM);
static int clicked = 0;
static int fpsCount = 0;
static int fpsLimit = 1;
StopWatchInterface *timer = NULL;
// Particle data
GLuint vbo = 0; // OpenGL vertex buffer object
struct cudaGraphicsResource *cuda_vbo_resource; // handles OpenGL-CUDA exchange
static cData *particles = NULL; // particle positions in host memory
static int lastx = 0, lasty = 0;
// Texture pitch
size_t tPitch = 0; // Now this is compatible with gcc in 64-bit
char *ref_file = NULL;
bool g_bQAAddTestForce = true;
int g_iFrameToCompare = 100;
int g_TotalErrors = 0;
bool g_bExitESC = false;
// CheckFBO/BackBuffer class objects
CheckRender *g_CheckRender = NULL;
void autoTest(char **);
extern "C" void addForces(cData *v, int dx, int dy, int spx, int spy, float fx,
float fy, int r);
extern "C" void advectVelocity(cData *v, float *vx, float *vy, int dx, int pdx,
int dy, float dt);
extern "C" void diffuseProject(cData *vx, cData *vy, int dx, int dy, float dt,
float visc);
extern "C" void updateVelocity(cData *v, float *vx, float *vy, int dx, int pdx,
int dy);
extern "C" void advectParticles(GLuint vbo, cData *v, int dx, int dy, float dt);
void simulateFluids(void) {
// simulate fluid
advectVelocity(dvfield, (float *)vxfield, (float *)vyfield, DIM, RPADW, DIM,
DT);
diffuseProject(vxfield, vyfield, CPADW, DIM, DT, VIS);
updateVelocity(dvfield, (float *)vxfield, (float *)vyfield, DIM, RPADW, DIM);
advectParticles(vbo, dvfield, DIM, DIM, DT);
}
void display(void) {
if (!ref_file) {
sdkStartTimer(&timer);
simulateFluids();
}
// render points from vertex buffer
glClear(GL_COLOR_BUFFER_BIT);
glColor4f(0, 1, 0, 0.5f);
glPointSize(1);
glEnable(GL_POINT_SMOOTH);
glEnable(GL_BLEND);
glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
glEnableClientState(GL_VERTEX_ARRAY);
glDisable(GL_DEPTH_TEST);
glDisable(GL_CULL_FACE);
glBindBuffer(GL_ARRAY_BUFFER, vbo);
glVertexPointer(2, GL_FLOAT, 0, NULL);
glDrawArrays(GL_POINTS, 0, DS);
glBindBuffer(GL_ARRAY_BUFFER, 0);
glDisableClientState(GL_VERTEX_ARRAY);
glDisableClientState(GL_TEXTURE_COORD_ARRAY);
glDisable(GL_TEXTURE_2D);
if (ref_file) {
return;
}
// Finish timing before swap buffers to avoid refresh sync
sdkStopTimer(&timer);
glutSwapBuffers();
fpsCount++;
if (fpsCount == fpsLimit) {
char fps[256];
float ifps = 1.f / (sdkGetAverageTimerValue(&timer) / 1000.f);
sprintf(fps, "Cuda/GL Stable Fluids (%d x %d): %3.1f fps", DIM, DIM, ifps);
glutSetWindowTitle(fps);
fpsCount = 0;
fpsLimit = (int)MAX(ifps, 1.f);
sdkResetTimer(&timer);
}
glutPostRedisplay();
}
void autoTest(char **argv) {
CFrameBufferObject *fbo =
new CFrameBufferObject(wWidth, wHeight, 4, false, GL_TEXTURE_2D);
g_CheckRender = new CheckFBO(wWidth, wHeight, 4, fbo);
g_CheckRender->setPixelFormat(GL_RGBA);
g_CheckRender->setExecPath(argv[0]);
g_CheckRender->EnableQAReadback(true);
fbo->bindRenderPath();
reshape(wWidth, wHeight);
for (int count = 0; count < g_iFrameToCompare; count++) {
simulateFluids();
// add in a little force so the automated testing is interesting.
if (ref_file) {
int x = wWidth / (count + 1);
int y = wHeight / (count + 1);
float fx = (x / (float)wWidth);
float fy = (y / (float)wHeight);
int nx = (int)(fx * DIM);
int ny = (int)(fy * DIM);
int ddx = 35;
int ddy = 35;
fx = ddx / (float)wWidth;
fy = ddy / (float)wHeight;
int spy = ny - FR;
int spx = nx - FR;
addForces(dvfield, DIM, DIM, spx, spy, FORCE * DT * fx, FORCE * DT * fy,
FR);
lastx = x;
lasty = y;
}
}
display();
fbo->unbindRenderPath();
// compare to official reference image, printing PASS or FAIL.
printf("> (Frame %d) Readback BackBuffer\n", 100);
g_CheckRender->readback(wWidth, wHeight);
g_CheckRender->savePPM("fluidsGL.ppm", true, NULL);
if (!g_CheckRender->PPMvsPPM("fluidsGL.ppm", ref_file, MAX_EPSILON_ERROR,
0.25f)) {
g_TotalErrors++;
}
}
// very simple von neumann middle-square prng. can't use rand() in -qatest
// mode because its implementation varies across platforms which makes testing
// for consistency in the important parts of this program difficult.
float myrand(void) {
static int seed = 72191;
char sq[22];
if (ref_file) {
seed *= seed;
sprintf(sq, "%010d", seed);
// pull the middle 5 digits out of sq
sq[8] = 0;
seed = atoi(&sq[3]);
return seed / 99999.f;
} else {
return rand() / (float)RAND_MAX;
}
}
void initParticles(cData *p, int dx, int dy) {
int i, j;
for (i = 0; i < dy; i++) {
for (j = 0; j < dx; j++) {
p[i * dx + j].x = (j + 0.5f + (myrand() - 0.5f)) / dx;
p[i * dx + j].y = (i + 0.5f + (myrand() - 0.5f)) / dy;
}
}
}
void keyboard(unsigned char key, int x, int y) {
switch (key) {
case 27:
g_bExitESC = true;
#if defined(__APPLE__) || defined(MACOSX)
exit(EXIT_SUCCESS);
#else
glutDestroyWindow(glutGetWindow());
return;
#endif
break;
case 'r':
memset(hvfield, 0, sizeof(cData) * DS);
cudaMemcpy(dvfield, hvfield, sizeof(cData) * DS, cudaMemcpyHostToDevice);
initParticles(particles, DIM, DIM);
cudaGraphicsUnregisterResource(cuda_vbo_resource);
getLastCudaError("cudaGraphicsUnregisterBuffer failed");
glBindBuffer(GL_ARRAY_BUFFER, vbo);
glBufferData(GL_ARRAY_BUFFER, sizeof(cData) * DS, particles,
GL_DYNAMIC_DRAW_ARB);
glBindBuffer(GL_ARRAY_BUFFER, 0);
cudaGraphicsGLRegisterBuffer(&cuda_vbo_resource, vbo,
cudaGraphicsMapFlagsNone);
getLastCudaError("cudaGraphicsGLRegisterBuffer failed");
break;
default:
break;
}
}
void click(int button, int updown, int x, int y) {
lastx = x;
lasty = y;
clicked = !clicked;
}
void motion(int x, int y) {
// Convert motion coordinates to domain
float fx = (lastx / (float)wWidth);
float fy = (lasty / (float)wHeight);
int nx = (int)(fx * DIM);
int ny = (int)(fy * DIM);
if (clicked && nx < DIM - FR && nx > FR - 1 && ny < DIM - FR && ny > FR - 1) {
int ddx = x - lastx;
int ddy = y - lasty;
fx = ddx / (float)wWidth;
fy = ddy / (float)wHeight;
int spy = ny - FR;
int spx = nx - FR;
addForces(dvfield, DIM, DIM, spx, spy, FORCE * DT * fx, FORCE * DT * fy,
FR);
lastx = x;
lasty = y;
}
glutPostRedisplay();
}
void reshape(int x, int y) {
wWidth = x;
wHeight = y;
glViewport(0, 0, x, y);
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
glOrtho(0, 1, 1, 0, 0, 1);
glMatrixMode(GL_MODELVIEW);
glLoadIdentity();
glutPostRedisplay();
}
void cleanup(void) {
cudaGraphicsUnregisterResource(cuda_vbo_resource);
deleteTexture();
// Free all host and device resources
free(hvfield);
free(particles);
cudaFree(dvfield);
cudaFree(vxfield);
cudaFree(vyfield);
cufftDestroy(planr2c);
cufftDestroy(planc2r);
glBindBuffer(GL_ARRAY_BUFFER, 0);
glDeleteBuffers(1, &vbo);
sdkDeleteTimer(&timer);
}
int initGL(int *argc, char **argv) {
glutInit(argc, argv);
glutInitDisplayMode(GLUT_RGBA | GLUT_DOUBLE);
glutInitWindowSize(wWidth, wHeight);
glutCreateWindow("Compute Stable Fluids");
glutDisplayFunc(display);
glutKeyboardFunc(keyboard);
glutMouseFunc(click);
glutMotionFunc(motion);
glutReshapeFunc(reshape);
if (!isGLVersionSupported(1, 5)) {
fprintf(stderr, "ERROR: Support for OpenGL 1.5 is missing");
fflush(stderr);
return false;
}
if (!areGLExtensionsSupported("GL_ARB_vertex_buffer_object")) {
fprintf(stderr, "ERROR: Support for necessary OpenGL extensions missing.");
fflush(stderr);
return false;
}
return true;
}
int main(int argc, char **argv) {
int devID;
cudaDeviceProp deviceProps;
#if defined(__linux__)
char *Xstatus = getenv("DISPLAY");
if (Xstatus == NULL) {
printf("Waiving execution as X server is not running\n");
exit(EXIT_WAIVED);
}
setenv("DISPLAY", ":0", 0);
#endif
printf("%s Starting...\n\n", sSDKname);
printf(
"NOTE: The CUDA Samples are not meant for performance measurements. "
"Results may vary when GPU Boost is enabled.\n\n");
// First initialize OpenGL context, so we can properly set the GL for CUDA.
// This is necessary in order to achieve optimal performance with OpenGL/CUDA
// interop.
if (false == initGL(&argc, argv)) {
exit(EXIT_SUCCESS);
}
// use command-line specified CUDA device, otherwise use device with highest
// Gflops/s
devID = findCudaDevice(argc, (const char **)argv);
// get number of SMs on this GPU
checkCudaErrors(cudaGetDeviceProperties(&deviceProps, devID));
printf("CUDA device [%s] has %d Multi-Processors\n", deviceProps.name,
deviceProps.multiProcessorCount);
// automated build testing harness
if (checkCmdLineFlag(argc, (const char **)argv, "file")) {
getCmdLineArgumentString(argc, (const char **)argv, "file", &ref_file);
}
// Allocate and initialize host data
GLint bsize;
sdkCreateTimer(&timer);
sdkResetTimer(&timer);
hvfield = (cData *)malloc(sizeof(cData) * DS);
memset(hvfield, 0, sizeof(cData) * DS);
// Allocate and initialize device data
cudaMallocPitch((void **)&dvfield, &tPitch, sizeof(cData) * DIM, DIM);
cudaMemcpy(dvfield, hvfield, sizeof(cData) * DS, cudaMemcpyHostToDevice);
// Temporary complex velocity field data
cudaMalloc((void **)&vxfield, sizeof(cData) * PDS);
cudaMalloc((void **)&vyfield, sizeof(cData) * PDS);
setupTexture(DIM, DIM);
// Create particle array
particles = (cData *)malloc(sizeof(cData) * DS);
memset(particles, 0, sizeof(cData) * DS);
initParticles(particles, DIM, DIM);
// Create CUFFT transform plan configuration
checkCudaErrors(cufftPlan2d(&planr2c, DIM, DIM, CUFFT_R2C));
checkCudaErrors(cufftPlan2d(&planc2r, DIM, DIM, CUFFT_C2R));
glGenBuffers(1, &vbo);
glBindBuffer(GL_ARRAY_BUFFER, vbo);
glBufferData(GL_ARRAY_BUFFER, sizeof(cData) * DS, particles,
GL_DYNAMIC_DRAW_ARB);
glGetBufferParameteriv(GL_ARRAY_BUFFER, GL_BUFFER_SIZE, &bsize);
if (bsize != (sizeof(cData) * DS)) goto EXTERR;
glBindBuffer(GL_ARRAY_BUFFER, 0);
checkCudaErrors(cudaGraphicsGLRegisterBuffer(&cuda_vbo_resource, vbo,
cudaGraphicsMapFlagsNone));
getLastCudaError("cudaGraphicsGLRegisterBuffer failed");
if (ref_file) {
autoTest(argv);
cleanup();
printf("[fluidsGL] - Test Results: %d Failures\n", g_TotalErrors);
exit(g_TotalErrors == 0 ? EXIT_SUCCESS : EXIT_FAILURE);
} else {
#if defined(__APPLE__) || defined(MACOSX)
atexit(cleanup);
#else
glutCloseFunc(cleanup);
#endif
glutMainLoop();
}
if (!ref_file) {
exit(EXIT_SUCCESS);
}
return 0;
EXTERR:
printf("Failed to initialize GL extensions.\n");
exit(EXIT_FAILURE);
}