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WaveEquationDemo.cpp
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WaveEquationDemo.cpp
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#include "raylib.h"
#include "raymath.h"
#define RAYGUI_IMPLEMENTATION
#include "raygui.h"
#include <math.h>
#include <cstdlib>
#include <stdio.h>
#include <string.h>
#include <vector>
#include <iostream>
#include <fstream>
#include <string>
#include <algorithm>
#include <random> //for random engine
#include <CL/cl.hpp>
using namespace std;
default_random_engine generator;
normal_distribution<float> dist1(0,0.2);
uniform_real_distribution<float> dist2(-1.0,1.0);
struct particle {
Vector3 position;
Vector3 velocity;
float radius;
float mass;
Color color;
};
Color Colorizer(int binval) {
Color c;
binval*=4;
c.a=255;
c.r=(binval<255)?binval:255;
c.g=binval/10;
c.b=0;
return c;
}
int main()
{
bool render_freeze=false;
bool render_histogram=false;
bool fancy_histogram=false;
bool set_fancy_cam=false; //toggles for whether we need to update camera perspective
bool set_regular_cam=false; //toggles for whether we need to update camera perspective
int WinXsize=1200, WinYsize=900;
int MAXPARTS=5000;
float amplitude=400.0;
int number_of_bins=201;
float bin_width=2.0*amplitude/(number_of_bins-1);
int looper=0;
int THREE_D_FPS=60;
int NORMAL_FPS=30;
//Initialize Raylib
InitWindow(WinXsize, WinYsize, "Wave-Particle Demo");
SetWindowPosition(500,50);
Camera3D camera;
camera.position={0.0,0.0,-600.0};
camera.target={0.0,0.0,0.0};
camera.up={0.0,1.0,0.0};
camera.fovy=60.0;
camera.projection=CAMERA_PERSPECTIVE;
UpdateCamera(&camera);
Camera oldcamera=camera;
SetTargetFPS(NORMAL_FPS);
//Init OpenCL
std::vector<cl::Platform> all_platforms;
cl::Platform::get(&all_platforms);
if(all_platforms.size()==0){
std::cout<<" No platforms found. Check OpenCL installation!\n";
exit(1);
}
cl::Platform default_platform=all_platforms[0];
std::cout << "Using platform: "<<default_platform.getInfo<CL_PLATFORM_NAME>()<<"\n";
//get default device of the default platform
std::vector<cl::Device> all_devices;
default_platform.getDevices(CL_DEVICE_TYPE_ALL, &all_devices);
if(all_devices.size()==0){
std::cout<<" No devices found. Check OpenCL installation!\n";
exit(1);
}
cl::Device default_device=all_devices[0];
std::cout<< "Using device: "<<default_device.getInfo<CL_DEVICE_NAME>()<<"\n";
cl::Context context({default_device});
//Define an output buffer for data
cl::Buffer buffer_VEL(context,CL_MEM_READ_WRITE,sizeof(float)*MAXPARTS);
cl::Buffer buffer_POS(context,CL_MEM_READ_WRITE,sizeof(float)*MAXPARTS);
cl::Buffer buffer_OFFSET(context,CL_MEM_READ_WRITE,sizeof(float)*MAXPARTS);
cl::Buffer buffer_MASS(context,CL_MEM_READ_WRITE,sizeof(float)*MAXPARTS);
cl::Buffer buffer_FORCE(context,CL_MEM_READ_WRITE,sizeof(float)*1201); // TODO: Update to general
//Load kernel from file
ifstream t("./kernel.cl");
if (!t) { cout << "Error Opening Kernel Source file\n"; exit(-1); }
std::string kSrc((istreambuf_iterator<char>(t)), istreambuf_iterator<char>());
cl::Program::Sources sources(1, make_pair(kSrc.c_str(), kSrc.length()));
cl::Program program(context,sources);
if(program.build({default_device})!=CL_SUCCESS){
std::cout<<" Error building: "<<program.getBuildInfo<CL_PROGRAM_BUILD_LOG>(default_device)<<"\n";
exit(1);
}
//create queue to which we will push commands for the device.
cl::CommandQueue myqueue(context,default_device);
cl::Kernel mykernel=cl::Kernel(program,"sinusoidal", NULL);
//Init variables
Vector3 cpos={0.0,0.0,0.0};
Vector3 cvel={0.0,0.0,0.0};
float time=0.0; //12500.0;
float timestep=0.01;
int screennum=0;
char timestamp[15];
char page_number[5];
char page_time_in[15];
char page_time_out[15];
float velocities[MAXPARTS]; //for buffers. Will be better eventually to define a struct in kernel and push the whole particle struct to it
float positions[MAXPARTS];
float masses[MAXPARTS];
vector<int> bins;
bins.resize(number_of_bins);
vector<particle> particles;
vector< vector<int> > history;
particles.reserve(MAXPARTS);
particle newpart;
//Modify initial distribution of particle positions and velocities here
for (uint i=0;i<MAXPARTS;i++) {
newpart.radius=1;
newpart.mass=1;
newpart.color=(Color){255,255,255,255};
newpart.position=(Vector3){cpos.x,0.05f*(float)i,0};
newpart.velocity=cvel;
newpart.velocity.x=0.5;
//newpart.position.x+=32.0*dist1(generator);
//newpart.velocity.x+=dist1(generator); //gaussian distribution
newpart.position.x+=64.0*dist2(generator); //quantized velocities of uniform distribution
newpart.velocity.x+=0.25*floor(32.0*dist2(generator)); //quantized velocities of uniform distribution
//newpart.velocity.x+=8.0*dist2(generator); // uniform distribution, not quantized
//newpart.velocity.x+=0.1*floor(200*dist2(generator)); // quantized velocities of gaussian distribution
velocities[i]=newpart.velocity.x; //Load velocity upon creation
positions[i]=newpart.position.x; //Load positions just so buffer isn't filled with uninitalized data
masses[i]=newpart.mass; //Load masses
particles.push_back(newpart);
}
cpos.y=-5.0;
//For sinusoidal kernel
//Load velocities once
myqueue.enqueueWriteBuffer(buffer_VEL,CL_TRUE,0,sizeof(float)*particles.size(),&velocities[0],NULL,NULL);
myqueue.enqueueWriteBuffer(buffer_OFFSET,CL_TRUE,0,sizeof(float)*particles.size(),&positions[0],NULL,NULL);
mykernel.setArg(0,sizeof(float),&time);
mykernel.setArg(1,sizeof(float),&litude);
mykernel.setArg(2,buffer_VEL);
mykernel.setArg(3,buffer_POS);
mykernel.setArg(4,buffer_OFFSET); //Added an offset to starting position which is loaded from initial particle position
/*
//For general kernel
myqueue.enqueueWriteBuffer(buffer_VEL,CL_TRUE,0,sizeof(float)*particles.size(),&velocities[0],NULL,NULL);
myqueue.enqueueWriteBuffer(buffer_VEL,CL_TRUE,0,sizeof(float)*particles.size(),&positions[0],NULL,NULL);
myqueue.enqueueWriteBuffer(buffer_VEL,CL_TRUE,0,sizeof(float)*particles.size(),&masses[0],NULL,NULL); //Mass only needs to be loaded once
mykernel.setArg(0,sizeof(float),×tep);
mykernel.setArg(1,buffer_VEL);
mykernel.setArg(2,buffer_POS);
mykernel.setArg(3,buffer_MASS);
*/
char answer;
cout<<"Enter a letter to continue"<<endl;
cin>>answer;
//The render loop
while (!WindowShouldClose()) {
//Update
if (IsKeyPressed(KEY_F)) {render_freeze=true;}
if (IsKeyPressed(KEY_G)) {render_freeze=false;}
if (IsKeyPressed(KEY_H)) {render_histogram=true; fancy_histogram=false; render_freeze=true;}
if (IsKeyPressed(KEY_J)) {render_histogram=false; fancy_histogram=false; render_freeze=false; set_regular_cam=true;}
if (IsKeyPressed(KEY_N)) {render_histogram=true; fancy_histogram=true; render_freeze=true; set_fancy_cam=true;}
if (IsKeyPressed(KEY_EQUAL)) {NORMAL_FPS+=10; SetTargetFPS(NORMAL_FPS);}
if (IsKeyPressed(KEY_MINUS)) {NORMAL_FPS-=10; if (NORMAL_FPS<0) NORMAL_FPS=10; SetTargetFPS(NORMAL_FPS);}
if (IsKeyPressed(KEY_ZERO)) {NORMAL_FPS=0; SetTargetFPS(NORMAL_FPS);}
if (!render_freeze) {
time=time+timestep;
//cpos.x=amplitude*sin(cvel.x*time); //Update central particle on its own
cvel.x=velocities[0];
cpos.x=positions[0];
//cout<<"Loc: "<<loc<<" Vel:"<<cvel.x<<" Pos:"<<cpos.x<<endl;
//For sinusoidal kernel
mykernel.setArg(0,sizeof(float),&time); //Only need to update time for each kernel call
myqueue.enqueueNDRangeKernel(mykernel,cl::NullRange,cl::NDRange(particles.size()),cl::NullRange);
//Get data back out
myqueue.enqueueReadBuffer(buffer_POS,CL_TRUE,0,sizeof(float)*particles.size(),&positions[0], NULL, NULL);
for (uint i=0;i<particles.size();i++) {
particles[i].position.x=positions[i];
}
/*
//For general kernel
//Load velocity and position values
for (uint i=0;i<MAXPARTS;i++) {
velocities[i]=particles[i].velocity.x;
positions[i]=particles[i].position.x;
}
myqueue.enqueueWriteBuffer(buffer_VEL,CL_TRUE,0,sizeof(float)*particles.size(),&velocities[0],NULL,NULL);
myqueue.enqueueWriteBuffer(buffer_POS,CL_TRUE,0,sizeof(float)*particles.size(),&positions[0],NULL,NULL);
mykernel.setArg(1,buffer_VEL);
mykernel.setArg(2,buffer_POS);
myqueue.enqueueNDRangeKernel(mykernel,cl::NullRange,cl::NDRange(particles.size()),cl::NullRange);
//Get updated velocity and position values back
myqueue.enqueueReadBuffer(buffer_VEL,CL_TRUE,0,sizeof(float)*particles.size(),&velocities[0], NULL, NULL);
myqueue.enqueueReadBuffer(buffer_POS,CL_TRUE,0,sizeof(float)*particles.size(),&positions[0], NULL, NULL);
for (uint i=0;i<particles.size();i++) {
particles[i].velocity.x=velocities[i];
particles[i].position.x=positions[i];
}
//Done
*/
}
if (render_histogram==false) {
BeginDrawing();
if (set_regular_cam) {
//cout<<"Resetting Camera"<<endl;
camera=oldcamera;
UpdateCamera(&camera);
SetTargetFPS(NORMAL_FPS);
set_regular_cam=false;
}
BeginMode3D(camera);
ClearBackground(BLACK);
DrawSphere(cpos,1.0,RED);
for (uint i=0, idx=0;i<MAXPARTS;i++) {
DrawCube(particles[i].position,1.0,1.0,1.0,WHITE);
//Tired of out-of-bounds segfaults here. Kludging with a clamp.
idx=(uint)floor((particles[i].position.x+amplitude)/bin_width);
if (idx<0) idx=0;
if (idx>number_of_bins) idx=number_of_bins;
bins[idx]++; //fill bins while we draw
}
//Draw histogram
for (int i=0;i<number_of_bins-1;i++){
DrawCube((Vector3){-amplitude+i*bin_width,-300+(bins[i]/4),1},bin_width,bins[i]/2,bin_width,BLUE);
}
EndMode3D();
if (render_freeze==false) { // Don't store history when render_freeze is true, or else we just streak the same values
history.push_back(bins);
}
for (int i=0;i<number_of_bins;i++){
bins[i]=0;
}
DrawFPS(10,10);
sprintf(timestamp,"%12.3f",time);
DrawText(timestamp,1000,10,20,GREEN);
EndDrawing();
//End Live Mode Draw Routine
}
else if (!fancy_histogram) {
//Begin 2D History Draw Routine
int plotstart = 0;
int plotend = 0;
int spacer=0;
int maxwidth = number_of_bins*floor(1200/number_of_bins)+1;
int LinesPerScreen = floor(1200/number_of_bins)*900;
if (IsKeyPressed(KEY_W)) {
screennum--;
screennum=(screennum<0)?0:screennum;
}
if (IsKeyPressed(KEY_S)) {
screennum++;
if (screennum*LinesPerScreen>history.size()) {cout<<"At Last Screen"<<endl; screennum--;}
}
plotstart=screennum*LinesPerScreen;
plotend=plotstart+LinesPerScreen;
plotend=(plotend>history.size())?history.size():plotend;
BeginDrawing();
ClearBackground(BLACK);
Vector3 plotspot;
for (int i=plotstart;i<plotend;i++) {
for (int j=0;j<history[i].size();j++) {
plotspot.x=j+number_of_bins*((i-plotstart)/900);
spacer=10*(((i-plotstart)/900)+1);
while (plotspot.x>maxwidth) {plotspot.x-=maxwidth;}
plotspot.y=((i-plotstart)%900);
plotspot.z=0;
DrawPixel(plotspot.x+spacer,plotspot.y,Colorizer(history[i][j]));
}
}
DrawLine(plotspot.x-number_of_bins+spacer,plotspot.y+1,plotspot.x+spacer,plotspot.y+1,GREEN);
DrawFPS(10,10);
sprintf(page_number,"%i",screennum);
sprintf(page_time_in,"%12.3f",0.01*plotstart);
sprintf(page_time_out,"%12.3f",0.01*plotend);
DrawText("Page:",1100,10,20,GREEN);
DrawText(page_number,1170,10,20,GREEN);
DrawText("From Time:",1080,50,20,GREEN);
DrawText(page_time_in,1050,70,20,GREEN);
DrawText("To Time:",1100,110,20,GREEN);
DrawText(page_time_out,1050,130,20,GREEN);
EndDrawing();
}
else {
//Begin 3D History Draw Routine
if (set_fancy_cam) {
SetTargetFPS(THREE_D_FPS);
camera.position={-100.0,220.0,-160.0};
camera.target={-100.0,86.0,10.0};
camera.up={0.0,1.0,0.0};
UpdateCamera(&camera);
set_fancy_cam=false;
}
BeginDrawing();
BeginMode3D(camera);
ClearBackground(BLACK);
float height=0.0;
Vector3 pos=(Vector3){0.0,0.0,0.0};
//DrawGizmo((Vector3){0.0,0.0,0.0});
for (int z=looper+0;z<looper+100;z++) {
for (int x=0;x<number_of_bins;x++) {
pos.x=-300+2*x;
pos.z=2*(z-looper);
height=history[z][x]/4.0;
//DrawCube(pos,2.0,height,2.0,BLUE); //Both Cube and Wires gives best visualization but slow performance
DrawCubeWires(pos,2.0,height,2.0,Colorizer(history[z][x]));
if (height>0.1) {
DrawCube(pos,2.0,height,2.0,Colorizer(history[z][x]));
//DrawCubeWires(pos,2.0,height,2.0,BLACK); //(Color){0,192,255,255}
}
else {
DrawCube(pos,2.0,height,2.0,BLACK);
}
}
}
looper++;
looper=(looper>history.size()-101)?0:looper;
EndMode3D();
DrawFPS(10,10);
EndDrawing();
}
} //End render loop
return 0;
}