/
Air.cpp
372 lines (345 loc) · 9.62 KB
/
Air.cpp
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#include <cmath>
#include <algorithm>
#include "Config.h"
#include "Air.h"
#include "Simulation.h"
//#include <powder.h>
//#include <defines.h>
#include "Gravity.h"
/*float kernel[9];
float vx[YRES/CELL][XRES/CELL], ovx[YRES/CELL][XRES/CELL];
float vy[YRES/CELL][XRES/CELL], ovy[YRES/CELL][XRES/CELL];
float pv[YRES/CELL][XRES/CELL], opv[YRES/CELL][XRES/CELL];
unsigned char bmap_blockair[YRES/CELL][XRES/CELL];
float cb_vx[YRES/CELL][XRES/CELL];
float cb_vy[YRES/CELL][XRES/CELL];
float cb_pv[YRES/CELL][XRES/CELL];
float cb_hv[YRES/CELL][XRES/CELL];
float fvx[YRES/CELL][XRES/CELL], fvy[YRES/CELL][XRES/CELL];
float hv[YRES/CELL][XRES/CELL], ohv[YRES/CELL][XRES/CELL]; // For Ambient Heat */
void Air::make_kernel(void) //used for velocity
{
int i, j;
float s = 0.0f;
for (j=-1; j<2; j++)
for (i=-1; i<2; i++)
{
kernel[(i+1)+3*(j+1)] = expf(-2.0f*(i*i+j*j));
s += kernel[(i+1)+3*(j+1)];
}
s = 1.0f / s;
for (j=-1; j<2; j++)
for (i=-1; i<2; i++)
kernel[(i+1)+3*(j+1)] *= s;
}
void Air::Clear()
{
std::fill(&pv[0][0], &pv[0][0]+((XRES/CELL)*(YRES/CELL)), 0.0f);
std::fill(&vy[0][0], &vy[0][0]+((XRES/CELL)*(YRES/CELL)), 0.0f);
std::fill(&vx[0][0], &vx[0][0]+((XRES/CELL)*(YRES/CELL)), 0.0f);
}
void Air::ClearAirH()
{
std::fill(&hv[0][0], &hv[0][0]+((XRES/CELL)*(YRES/CELL)), ambientAirTemp);
}
void Air::update_airh(void)
{
int x, y, i, j;
float odh, dh, dx, dy, f, tx, ty;
for (i=0; i<YRES/CELL; i++) //reduces pressure/velocity on the edges every frame
{
hv[i][0] = ambientAirTemp;
hv[i][1] = ambientAirTemp;
hv[i][XRES/CELL-3] = ambientAirTemp;
hv[i][XRES/CELL-2] = ambientAirTemp;
hv[i][XRES/CELL-1] = ambientAirTemp;
}
for (i=0; i<XRES/CELL; i++) //reduces pressure/velocity on the edges every frame
{
hv[0][i] = ambientAirTemp;
hv[1][i] = ambientAirTemp;
hv[YRES/CELL-3][i] = ambientAirTemp;
hv[YRES/CELL-2][i] = ambientAirTemp;
hv[YRES/CELL-1][i] = ambientAirTemp;
}
for (y=0; y<YRES/CELL; y++) //update velocity and pressure
{
for (x=0; x<XRES/CELL; x++)
{
dh = 0.0f;
dx = 0.0f;
dy = 0.0f;
for (j=-1; j<2; j++)
{
for (i=-1; i<2; i++)
{
if (y+j>0 && y+j<YRES/CELL-2 &&
x+i>0 && x+i<XRES/CELL-2 &&
!(bmap_blockairh[y+j][x+i]&0x8))
{
f = kernel[i+1+(j+1)*3];
dh += hv[y+j][x+i]*f;
dx += vx[y+j][x+i]*f;
dy += vy[y+j][x+i]*f;
}
else
{
f = kernel[i+1+(j+1)*3];
dh += hv[y][x]*f;
dx += vx[y][x]*f;
dy += vy[y][x]*f;
}
}
}
tx = x - dx*0.7f;
ty = y - dy*0.7f;
i = (int)tx;
j = (int)ty;
tx -= i;
ty -= j;
if (i>=2 && i<XRES/CELL-3 && j>=2 && j<YRES/CELL-3)
{
odh = dh;
dh *= 1.0f - AIR_VADV;
dh += AIR_VADV*(1.0f-tx)*(1.0f-ty)*((bmap_blockairh[j][i]&0x8) ? odh : hv[j][i]);
dh += AIR_VADV*tx*(1.0f-ty)*((bmap_blockairh[j][i+1]&0x8) ? odh : hv[j][i+1]);
dh += AIR_VADV*(1.0f-tx)*ty*((bmap_blockairh[j+1][i]&0x8) ? odh : hv[j+1][i]);
dh += AIR_VADV*tx*ty*((bmap_blockairh[j+1][i+1]&0x8) ? odh : hv[j+1][i+1]);
}
if(!sim.gravityMode)
{ //Vertical gravity only for the time being
float airdiff = hv[y-1][x]-hv[y][x];
if(airdiff>0 && !(bmap_blockairh[y-1][x]&0x8))
vy[y][x] -= airdiff/5000.0f;
}
ohv[y][x] = dh;
}
}
memcpy(hv, ohv, sizeof(hv));
}
void Air::update_air(void)
{
int x = 0, y = 0, i = 0, j = 0;
float dp = 0.0f, dx = 0.0f, dy = 0.0f, f = 0.0f, tx = 0.0f, ty = 0.0f;
const float advDistanceMult = 0.7f;
float stepX, stepY;
int stepLimit, step;
if (airMode != 4) { //airMode 4 is no air/pressure update
for (i=0; i<YRES/CELL; i++) //reduces pressure/velocity on the edges every frame
{
pv[i][0] = pv[i][0]*0.8f;
pv[i][1] = pv[i][1]*0.8f;
pv[i][2] = pv[i][2]*0.8f;
pv[i][XRES/CELL-2] = pv[i][XRES/CELL-2]*0.8f;
pv[i][XRES/CELL-1] = pv[i][XRES/CELL-1]*0.8f;
vx[i][0] = vx[i][1]*0.9f;
vx[i][1] = vx[i][2]*0.9f;
vx[i][XRES/CELL-2] = vx[i][XRES/CELL-3]*0.9f;
vx[i][XRES/CELL-1] = vx[i][XRES/CELL-2]*0.9f;
vy[i][0] = vy[i][1]*0.9f;
vy[i][1] = vy[i][2]*0.9f;
vy[i][XRES/CELL-2] = vy[i][XRES/CELL-3]*0.9f;
vy[i][XRES/CELL-1] = vy[i][XRES/CELL-2]*0.9f;
}
for (i=0; i<XRES/CELL; i++) //reduces pressure/velocity on the edges every frame
{
pv[0][i] = pv[0][i]*0.8f;
pv[1][i] = pv[1][i]*0.8f;
pv[2][i] = pv[2][i]*0.8f;
pv[YRES/CELL-2][i] = pv[YRES/CELL-2][i]*0.8f;
pv[YRES/CELL-1][i] = pv[YRES/CELL-1][i]*0.8f;
vx[0][i] = vx[1][i]*0.9f;
vx[1][i] = vx[2][i]*0.9f;
vx[YRES/CELL-2][i] = vx[YRES/CELL-3][i]*0.9f;
vx[YRES/CELL-1][i] = vx[YRES/CELL-2][i]*0.9f;
vy[0][i] = vy[1][i]*0.9f;
vy[1][i] = vy[2][i]*0.9f;
vy[YRES/CELL-2][i] = vy[YRES/CELL-3][i]*0.9f;
vy[YRES/CELL-1][i] = vy[YRES/CELL-2][i]*0.9f;
}
for (j=1; j<YRES/CELL; j++) //clear some velocities near walls
{
for (i=1; i<XRES/CELL; i++)
{
if (bmap_blockair[j][i])
{
vx[j][i] = 0.0f;
vx[j][i-1] = 0.0f;
vy[j][i] = 0.0f;
vy[j-1][i] = 0.0f;
}
}
}
for (y=1; y<YRES/CELL; y++) //pressure adjustments from velocity
for (x=1; x<XRES/CELL; x++)
{
dp = 0.0f;
dp += vx[y][x-1] - vx[y][x];
dp += vy[y-1][x] - vy[y][x];
pv[y][x] *= AIR_PLOSS;
pv[y][x] += dp*AIR_TSTEPP;
}
for (y=0; y<YRES/CELL-1; y++) //velocity adjustments from pressure
for (x=0; x<XRES/CELL-1; x++)
{
dx = dy = 0.0f;
dx += pv[y][x] - pv[y][x+1];
dy += pv[y][x] - pv[y+1][x];
vx[y][x] *= AIR_VLOSS;
vy[y][x] *= AIR_VLOSS;
vx[y][x] += dx*AIR_TSTEPV;
vy[y][x] += dy*AIR_TSTEPV;
if (bmap_blockair[y][x] || bmap_blockair[y][x+1])
vx[y][x] = 0;
if (bmap_blockair[y][x] || bmap_blockair[y+1][x])
vy[y][x] = 0;
}
for (y=0; y<YRES/CELL; y++) //update velocity and pressure
for (x=0; x<XRES/CELL; x++)
{
dx = 0.0f;
dy = 0.0f;
dp = 0.0f;
for (j=-1; j<2; j++)
for (i=-1; i<2; i++)
if (y+j>0 && y+j<YRES/CELL-1 &&
x+i>0 && x+i<XRES/CELL-1 &&
!bmap_blockair[y+j][x+i])
{
f = kernel[i+1+(j+1)*3];
dx += vx[y+j][x+i]*f;
dy += vy[y+j][x+i]*f;
dp += pv[y+j][x+i]*f;
}
else
{
f = kernel[i+1+(j+1)*3];
dx += vx[y][x]*f;
dy += vy[y][x]*f;
dp += pv[y][x]*f;
}
tx = x - dx*advDistanceMult;
ty = y - dy*advDistanceMult;
if ((dx*advDistanceMult>1.0f || dy*advDistanceMult>1.0f) && (tx>=2 && tx<XRES/CELL-2 && ty>=2 && ty<YRES/CELL-2))
{
// Trying to take velocity from far away, check whether there is an intervening wall. Step from current position to desired source location, looking for walls, with either the x or y step size being 1 cell
if (abs(dx)>abs(dy))
{
stepX = (dx<0.0f) ? 1 : -1;
stepY = -dy/fabsf(dx);
stepLimit = (int)(fabsf(dx*advDistanceMult));
}
else
{
stepY = (dy<0.0f) ? 1 : -1;
stepX = -dx/fabsf(dy);
stepLimit = (int)(fabsf(dy*advDistanceMult));
}
tx = x;
ty = y;
for (step=0; step<stepLimit; ++step)
{
tx += stepX;
ty += stepY;
if (bmap_blockair[(int)(ty+0.5f)][(int)(tx+0.5f)])
{
tx -= stepX;
ty -= stepY;
break;
}
}
if (step==stepLimit)
{
// No wall found
tx = x - dx*advDistanceMult;
ty = y - dy*advDistanceMult;
}
}
i = (int)tx;
j = (int)ty;
tx -= i;
ty -= j;
if (!bmap_blockair[y][x] && i>=2 && i<=XRES/CELL-3 &&
j>=2 && j<=YRES/CELL-3)
{
dx *= 1.0f - AIR_VADV;
dy *= 1.0f - AIR_VADV;
dx += AIR_VADV*(1.0f-tx)*(1.0f-ty)*vx[j][i];
dy += AIR_VADV*(1.0f-tx)*(1.0f-ty)*vy[j][i];
dx += AIR_VADV*tx*(1.0f-ty)*vx[j][i+1];
dy += AIR_VADV*tx*(1.0f-ty)*vy[j][i+1];
dx += AIR_VADV*(1.0f-tx)*ty*vx[j+1][i];
dy += AIR_VADV*(1.0f-tx)*ty*vy[j+1][i];
dx += AIR_VADV*tx*ty*vx[j+1][i+1];
dy += AIR_VADV*tx*ty*vy[j+1][i+1];
}
if (bmap[y][x] == WL_FAN)
{
dx += fvx[y][x];
dy += fvy[y][x];
}
// pressure/velocity caps
if (dp > 256.0f) dp = 256.0f;
if (dp < -256.0f) dp = -256.0f;
if (dx > 256.0f) dx = 256.0f;
if (dx < -256.0f) dx = -256.0f;
if (dy > 256.0f) dy = 256.0f;
if (dy < -256.0f) dy = -256.0f;
switch (airMode)
{
default:
case 0: //Default
break;
case 1: //0 Pressure
dp = 0.0f;
break;
case 2: //0 Velocity
dx = 0.0f;
dy = 0.0f;
break;
case 3: //0 Air
dx = 0.0f;
dy = 0.0f;
dp = 0.0f;
break;
case 4: //No Update
break;
}
ovx[y][x] = dx;
ovy[y][x] = dy;
opv[y][x] = dp;
}
memcpy(vx, ovx, sizeof(vx));
memcpy(vy, ovy, sizeof(vy));
memcpy(pv, opv, sizeof(pv));
}
}
void Air::Invert()
{
int nx, ny;
for (nx = 0; nx<XRES/CELL; nx++)
for (ny = 0; ny<YRES/CELL; ny++)
{
pv[ny][nx] = -pv[ny][nx];
vx[ny][nx] = -vx[ny][nx];
vy[ny][nx] = -vy[ny][nx];
}
}
Air::Air(Simulation & simulation):
airMode(0),
ambientAirTemp(295.15f),
sim(simulation)
{
//Simulation should do this.
make_kernel();
std::fill(&bmap_blockair[0][0], &bmap_blockairh[0][0]+((XRES/CELL)*(YRES/CELL)), 0);
std::fill(&bmap_blockairh[0][0], &bmap_blockair[0][0]+((XRES/CELL)*(YRES/CELL)), 0);
std::fill(&vx[0][0], &vx[0][0]+((XRES/CELL)*(YRES/CELL)), 0.0f);
std::fill(&ovx[0][0], &ovx[0][0]+((XRES/CELL)*(YRES/CELL)), 0.0f);
std::fill(&vy[0][0], &vy[0][0]+((XRES/CELL)*(YRES/CELL)), 0.0f);
std::fill(&ovy[0][0], &ovy[0][0]+((XRES/CELL)*(YRES/CELL)), 0.0f);
std::fill(&hv[0][0], &hv[0][0]+((XRES/CELL)*(YRES/CELL)), 0.0f);
std::fill(&ohv[0][0], &ohv[0][0]+((XRES/CELL)*(YRES/CELL)), 0.0f);
std::fill(&pv[0][0], &pv[0][0]+((XRES/CELL)*(YRES/CELL)), 0.0f);
std::fill(&opv[0][0], &opv[0][0]+((XRES/CELL)*(YRES/CELL)), 0.0f);
}