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blend fog of war into adjacent cells

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This commit is contained in:
scrawl 2012-05-27 00:39:33 +02:00
parent 63213b36bf
commit a7e6a142f9
1 changed files with 49 additions and 22 deletions
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71
apps/openmw/mwrender/localmap.cpp
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@ -307,19 +307,19 @@ void LocalMap::updatePlayer (const Ogre::Vector3& position, const Ogre::Quaterni
// convert from world coordinates to texture UV coordinates
float u,v;
std::string texName;
std::string texBaseName;
if (!mInterior)
{
u = std::abs((pos.x - (sSize*x))/sSize);
v = 1-std::abs((pos.y + (sSize*y))/sSize);
texName = "Cell_"+coordStr(x,y);
texBaseName = "Cell_";
}
else
{
u = (pos.x - min.x - sSize*x)/sSize;
v = (pos.y - min.y - sSize*y)/sSize;
texName = mInteriorName + "_" + coordStr(x,y);
texBaseName = mInteriorName + "_";
}
MWBase::Environment::get().getWindowManager()->setPlayerPos(u, v);
@ -327,30 +327,57 @@ void LocalMap::updatePlayer (const Ogre::Vector3& position, const Ogre::Quaterni
// explore radius (squared)
const float sqrExploreRadius = 0.01 * sFogOfWarResolution*sFogOfWarResolution;
const float exploreRadius = 0.1 * sFogOfWarResolution; // explore radius from 0 to sFogOfWarResolution
const float exploreRadiusUV = exploreRadius / sFogOfWarResolution; // explore radius from 0 to 1 (UV space)
// get the appropriate fog of war texture
TexturePtr tex = TextureManager::getSingleton().getByName(texName+"_fog");
if (!tex.isNull())
int intExtMult = mInterior ? 1 : -1; // interior and exterior have reversed Y coordinates (interior: top to bottom)
// change the affected fog of war textures (in a 3x3 grid around the player)
for (int mx = -1; mx<2; ++mx)
{
// get its buffer
if (mBuffers.find(texName) == mBuffers.end()) return;
int i=0;
for (int texV = 0; texV<sFogOfWarResolution; ++texV)
for (int my = -1; my<2; ++my)
{
for (int texU = 0; texU<sFogOfWarResolution; ++texU)
{
float sqrDist = Math::Sqr(texU - u*sFogOfWarResolution) + Math::Sqr(texV - v*sFogOfWarResolution);
uint32 clr = mBuffers[texName][i];
uint8 alpha = (clr >> 24);
alpha = std::min( alpha, (uint8) (std::max(0.f, std::min(1.f, (sqrDist/sqrExploreRadius)))*255) );
mBuffers[texName][i] = (uint32) (alpha << 24);
++i;
// is this texture affected at all?
bool affected = false;
if (mx == 0 && my == 0) // the player is always in the center of the 3x3 grid
affected = true;
else
{
bool affectsX = (mx > 0)? (u + exploreRadiusUV > 1) : (u - exploreRadiusUV < 0);
bool affectsY = (my > 0)? (v + exploreRadiusUV > 1) : (v - exploreRadiusUV < 0);
affected = (affectsX && (my == 0)) || (affectsY && mx == 0) || (affectsX && affectsY);
}
if (!affected)
continue;
std::string texName = texBaseName + coordStr(x+mx,y+my*intExtMult);
TexturePtr tex = TextureManager::getSingleton().getByName(texName+"_fog");
if (!tex.isNull())
{
// get its buffer
if (mBuffers.find(texName) == mBuffers.end()) return;
int i=0;
for (int texV = 0; texV<sFogOfWarResolution; ++texV)
{
for (int texU = 0; texU<sFogOfWarResolution; ++texU)
{
float sqrDist = Math::Sqr((texU + mx*sFogOfWarResolution) - u*sFogOfWarResolution) + Math::Sqr((texV + my*sFogOfWarResolution) - v*sFogOfWarResolution);
uint32 clr = mBuffers[texName][i];
uint8 alpha = (clr >> 24);
alpha = std::min( alpha, (uint8) (std::max(0.f, std::min(1.f, (sqrDist/sqrExploreRadius)))*255) );
mBuffers[texName][i] = (uint32) (alpha << 24);
++i;
}
}
// copy to the texture
memcpy(tex->getBuffer()->lock(HardwareBuffer::HBL_DISCARD), &mBuffers[texName][0], sFogOfWarResolution*sFogOfWarResolution*4);
tex->getBuffer()->unlock();
}
}
// copy to the texture
memcpy(tex->getBuffer()->lock(HardwareBuffer::HBL_DISCARD), &mBuffers[texName][0], sFogOfWarResolution*sFogOfWarResolution*4);
tex->getBuffer()->unlock();
}
}