bool PixelPerfectTest(const sf::Sprite& Object1, const sf::Sprite& Object2, sf::Uint8 AlphaLimit) {
sf::FloatRect Intersection;
if (Object1.getGlobalBounds().intersects(Object2.getGlobalBounds(), Intersection)) {
sf::IntRect O1SubRect = Object1.getTextureRect();
sf::IntRect O2SubRect = Object2.getTextureRect();
sf::Uint8* mask1 = Bitmasks.GetMask(Object1.getTexture());
sf::Uint8* mask2 = Bitmasks.GetMask(Object2.getTexture());
// Loop through our pixels
for (int i = Intersection.left; i < Intersection.left+Intersection.width; i++) {
for (int j = Intersection.top; j < Intersection.top+Intersection.height; j++) {
sf::Vector2f o1v = Object1.getInverseTransform().transformPoint(i, j);
sf::Vector2f o2v = Object2.getInverseTransform().transformPoint(i, j);
// Make sure pixels fall within the sprite's subrect
if (o1v.x > 0 && o1v.y > 0 && o2v.x > 0 && o2v.y > 0 &&
o1v.x < O1SubRect.width && o1v.y < O1SubRect.height &&
o2v.x < O2SubRect.width && o2v.y < O2SubRect.height) {
if (Bitmasks.GetPixel(mask1, Object1.getTexture(), (int)(o1v.x)+O1SubRect.left, (int)(o1v.y)+O1SubRect.top) > AlphaLimit &&
Bitmasks.GetPixel(mask2, Object2.getTexture(), (int)(o2v.x)+O2SubRect.left, (int)(o2v.y)+O2SubRect.top) > AlphaLimit)
return true;
}
}
}
}
return false;
}
bool PixelPerfectTest( const sf::Sprite& object1, const sf::Sprite& object2, sf::Uint8 AlphaLimit, const sf::Image & object1CollisionMask, const sf::Image & object2CollisionMask )
{
sf::FloatRect intersection;
if ( object1.getGlobalBounds().intersects( object2.getGlobalBounds(), intersection ) )
{
//We've got an intersection we need to process the pixels
//in that Rect.
//Bail out now if AlphaLimit = 0
if ( AlphaLimit == 0 ) return true;
//There are a few hacks here, sometimes the TransformToLocal returns negative points
//Or Points outside the image. We need to check for these as they print to the error console
//which is slow, and then return black which registers as a hit.
sf::Vector2f o1v;
sf::Vector2f o2v;
//Loop through our pixels
for ( int i = intersection.left; i < intersection.left+intersection.width; i++ ) //4ian : Rect now uses width/height.
{
for ( int j = intersection.top; j < intersection.top+intersection.height; j++ ) //4ian : Rect now uses width/height.
{
o1v = object1.getInverseTransform().transformPoint( i, j ); //Creating objects each loop :(
o2v = object2.getInverseTransform().transformPoint( i, j );
//Hack to make sure pixels fall within the Sprite's Image
if ( o1v.x > 0 && o1v.y > 0 && o2v.x > 0 && o2v.y > 0 &&
o1v.x < object1CollisionMask.getSize().x && o1v.y < object1CollisionMask.getSize().y &&
o2v.x < object2CollisionMask.getSize().x && o2v.y < object2CollisionMask.getSize().y )
{
//If both sprites have opaque pixels at the same point we've got a hit
if (( object1CollisionMask.getPixel( static_cast<int>( o1v.x ), static_cast<int>( o1v.y ) ).a > AlphaLimit ) &&
( object2CollisionMask.getPixel( static_cast<int>( o2v.x ), static_cast<int>( o2v.y ) ).a > AlphaLimit ) )
{
return true;
}
}
}
}
return false;
}
return false;
}
