void generateMultiplicationMap (const PLBmp & lightMap, PLBmp & destMap) {
assert(lightMap.GetWidth() == destMap.GetWidth() );
assert(lightMap.GetHeight() == destMap.GetHeight() );
assert(lightMap.GetBitsPerPixel() == 8);
assert(destMap.GetBitsPerPixel() == 8);
PLBYTE ** myLightMapLines = lightMap.GetLineArray();
PLBYTE ** myDestMapLines = destMap.GetLineArray();
PLBYTE myScale;
for (int y=0;y<lightMap.GetHeight(); y++) {
for (int x=0;x<lightMap.GetWidth(); x++) {
PLBYTE& col = myDestMapLines[y][x];
myScale = PLBYTE(myLightMapLines[y][x]);
int tempInt = (col*myScale)/255;
col = static_cast<PLBYTE>(min(tempInt, 255));
}
}
}
void applyMultiplicationMap (PLBmp & textureBmp, const PLBmp & attnBmp,
const PLRect & srcRect, double myLightingFactor)
{
assert(attnBmp.GetBitsPerPixel() == 8);
assert(textureBmp.GetBitsPerPixel() == 32);
assert (srcRect.Width() > 0 && srcRect.Height() > 0);
double Scale = double(srcRect.Width())/textureBmp.GetWidth();
double YScale = double(srcRect.Height())/textureBmp.GetHeight();
assert (Scale == YScale); (void)YScale;
PLBYTE ** myAttnBmpLines = attnBmp.GetLineArray();
PLPixel32 ** myTextureBmpLines = (PLPixel32**)textureBmp.GetLineArray();
if (Scale > 0.99) {
for (int y=0;y<textureBmp.GetHeight(); y++) {
for (int x=0;x<textureBmp.GetWidth(); x++) {
PLPixel32& col = myTextureBmpLines[y][x];
PLBYTE myScale;
myScale = PLBYTE(myAttnBmpLines[int(Scale*y+srcRect.tl.y)]
[int(Scale*x+srcRect.tl.x)]);
int tempIntR = int((myLightingFactor * col.GetR() * myScale)/256);
int tempIntG = int((myLightingFactor * col.GetG() * myScale)/256);
int tempIntB = int((myLightingFactor * col.GetB() * myScale)/256);
col.Set( static_cast<PLBYTE>(min(tempIntR,255)),
static_cast<PLBYTE>(min(tempIntG,255)),
static_cast<PLBYTE>(min(tempIntB,255)), 255 );
}
}
} else {
int MaxY = attnBmp.GetHeight()-1;
int MaxX = attnBmp.GetWidth()-1;
for (int y=0;y<textureBmp.GetHeight(); y++) {
double ySrcPos = Scale*y+srcRect.tl.y;
int yLightPos = int (ySrcPos);
double yLightFade = fmod (ySrcPos, 1);
if (yLightPos >= MaxY) {
yLightPos = MaxY - 1;
yLightFade = 1;
}
for (int x=0;x<textureBmp.GetWidth(); x++) {
PLPixel32& col = myTextureBmpLines[y][x];
double xSrcPos = Scale*x+srcRect.tl.x;
int xLightPos = int (xSrcPos);
double xLightFade = fmod (xSrcPos, 1);
if (xLightPos >= MaxX) {
xLightPos = MaxX - 1;
xLightFade = 1;
}
double myScale = double(myAttnBmpLines[yLightPos][xLightPos])*
(1-xLightFade)*(1-yLightFade) +
double(myAttnBmpLines[yLightPos][xLightPos+1])*
xLightFade*(1-yLightFade) +
double(myAttnBmpLines[yLightPos+1][xLightPos])*
(1-xLightFade)*yLightFade +
double(myAttnBmpLines[yLightPos+1][xLightPos+1])*
xLightFade*yLightFade;
int tempIntR = int((myLightingFactor * col.GetR() * myScale) /256);
int tempIntG = int((myLightingFactor * col.GetG() * myScale) /256);
int tempIntB = int((myLightingFactor * col.GetB() * myScale) /256);
col.Set( static_cast<PLBYTE>(min(tempIntR,255)),
static_cast<PLBYTE>(min(tempIntG,255)),
static_cast<PLBYTE>(min(tempIntB,255)),
255);
}
}
}
}