142 lines
4.2 KiB
C
142 lines
4.2 KiB
C
#include <math.h>
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#include <air.h>
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#include <powder.h>
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#include <defines.h>
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float kernel[9];
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float vx[YRES/CELL][XRES/CELL], ovx[YRES/CELL][XRES/CELL];
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float vy[YRES/CELL][XRES/CELL], ovy[YRES/CELL][XRES/CELL];
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float pv[YRES/CELL][XRES/CELL], opv[YRES/CELL][XRES/CELL];
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float cb_vx[YRES/CELL][XRES/CELL], cb_ovx[YRES/CELL][XRES/CELL];
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float cb_vy[YRES/CELL][XRES/CELL], cb_ovy[YRES/CELL][XRES/CELL];
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float cb_pv[YRES/CELL][XRES/CELL], cb_opv[YRES/CELL][XRES/CELL];
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float fvx[YRES/CELL][XRES/CELL], fvy[YRES/CELL][XRES/CELL];
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void make_kernel(void)
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{
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int i, j;
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float s = 0.0f;
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for(j=-1; j<2; j++)
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for(i=-1; i<2; i++)
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{
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kernel[(i+1)+3*(j+1)] = expf(-2.0f*(i*i+j*j));
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s += kernel[(i+1)+3*(j+1)];
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}
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s = 1.0f / s;
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for(j=-1; j<2; j++)
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for(i=-1; i<2; i++)
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kernel[(i+1)+3*(j+1)] *= s;
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}
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void update_air(void)
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{
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int x, y, i, j;
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float dp, dx, dy, f, tx, ty;
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for(y=1; y<YRES/CELL; y++)
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for(x=1; x<XRES/CELL; x++)
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{
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dp = 0.0f;
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dp += vx[y][x-1] - vx[y][x];
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dp += vy[y-1][x] - vy[y][x];
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pv[y][x] *= PLOSS;
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pv[y][x] += dp*TSTEPP;
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}
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for(y=0; y<YRES/CELL-1; y++)
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for(x=0; x<XRES/CELL-1; x++)
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{
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dx = dy = 0.0f;
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dx += pv[y][x] - pv[y][x+1];
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dy += pv[y][x] - pv[y+1][x];
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vx[y][x] *= VLOSS;
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vy[y][x] *= VLOSS;
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vx[y][x] += dx*TSTEPV;
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vy[y][x] += dy*TSTEPV;
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if(bmap[y][x]==1 || bmap[y][x+1]==1 ||
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bmap[y][x]==8 || bmap[y][x+1]==8 ||
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(bmap[y][x]==7 && !emap[y][x]) ||
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(bmap[y][x+1]==7 && !emap[y][x+1]))
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vx[y][x] = 0;
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if(bmap[y][x]==1 || bmap[y+1][x]==1 ||
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bmap[y][x]==8 || bmap[y+1][x]==8 ||
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(bmap[y][x]==7 && !emap[y][x]) ||
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(bmap[y+1][x]==7 && !emap[y+1][x]))
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vy[y][x] = 0;
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}
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for(y=0; y<YRES/CELL; y++)
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for(x=0; x<XRES/CELL; x++)
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{
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dx = 0.0f;
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dy = 0.0f;
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dp = 0.0f;
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for(j=-1; j<2; j++)
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for(i=-1; i<2; i++)
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if(y+j>0 && y+j<YRES/CELL-1 &&
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x+i>0 && x+i<XRES/CELL-1 &&
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bmap[y+j][x+i]!=1 &&
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bmap[y+j][x+i]!=8 &&
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(bmap[y+j][x+i]!=7 || emap[y+j][x+i]))
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{
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f = kernel[i+1+(j+1)*3];
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dx += vx[y+j][x+i]*f;
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dy += vy[y+j][x+i]*f;
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dp += pv[y+j][x+i]*f;
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}
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else
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{
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f = kernel[i+1+(j+1)*3];
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dx += vx[y][x]*f;
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dy += vy[y][x]*f;
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dp += pv[y][x]*f;
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}
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tx = x - dx*0.7f;
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ty = y - dy*0.7f;
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i = (int)tx;
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j = (int)ty;
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tx -= i;
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ty -= j;
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if(i>=2 && i<XRES/CELL-3 &&
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j>=2 && j<YRES/CELL-3)
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{
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dx *= 1.0f - VADV;
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dy *= 1.0f - VADV;
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dx += VADV*(1.0f-tx)*(1.0f-ty)*vx[j][i];
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dy += VADV*(1.0f-tx)*(1.0f-ty)*vy[j][i];
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dx += VADV*tx*(1.0f-ty)*vx[j][i+1];
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dy += VADV*tx*(1.0f-ty)*vy[j][i+1];
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dx += VADV*(1.0f-tx)*ty*vx[j+1][i];
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dy += VADV*(1.0f-tx)*ty*vy[j+1][i];
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dx += VADV*tx*ty*vx[j+1][i+1];
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dy += VADV*tx*ty*vy[j+1][i+1];
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}
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if(bmap[y][x] == 4)
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{
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dx += fvx[y][x];
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dy += fvy[y][x];
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}
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if(dp > 256.0f) dp = 256.0f;
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if(dp < -256.0f) dp = -256.0f;
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if(dx > 256.0f) dx = 256.0f;
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if(dx < -256.0f) dx = -256.0f;
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if(dy > 256.0f) dy = 256.0f;
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if(dy < -256.0f) dy = -256.0f;
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ovx[y][x] = dx;
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ovy[y][x] = dy;
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opv[y][x] = dp;
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}
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memcpy(vx, ovx, sizeof(vx));
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memcpy(vy, ovy, sizeof(vy));
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memcpy(pv, opv, sizeof(pv));
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}
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