Hi everyone, im facing a problem dealing with tile map, things went fine if i load my whole map completely as the tutorial here
bool load(const std::string& tileset, sf::Vector2u tileSize, const int* tiles, unsigned int width, unsigned int height)
{
// load the tileset texture
if (!m_tileset.loadFromFile(tileset))
return false;
// resize the vertex array to fit the level size
m_vertices.setPrimitiveType(sf::Quads);
m_vertices.resize(width * height * 4);
// populate the vertex array, with one quad per tile
for (unsigned int i = 0; i < width; ++i)
for (unsigned int j = 0; j < height; ++j)
{
// get the current tile number
int tileNumber = tiles[i + j * width];
// find its position in the tileset texture
int tu = tileNumber % (m_tileset.getSize().x / tileSize.x);
int tv = tileNumber / (m_tileset.getSize().x / tileSize.x);
// get a pointer to the current tile's quad
sf::Vertex* quad = &m_vertices[(i + j * width) * 4];
// define its 4 corners
quad[0].position = sf::Vector2f(i * tileSize.x, j * tileSize.y);
quad[1].position = sf::Vector2f((i + 1) * tileSize.x, j * tileSize.y);
quad[2].position = sf::Vector2f((i + 1) * tileSize.x, (j + 1) * tileSize.y);
quad[3].position = sf::Vector2f(i * tileSize.x, (j + 1) * tileSize.y);
// define its 4 texture coordinates
quad[0].texCoords = sf::Vector2f(tu * tileSize.x, tv * tileSize.y);
quad[1].texCoords = sf::Vector2f((tu + 1) * tileSize.x, tv * tileSize.y);
quad[2].texCoords = sf::Vector2f((tu + 1) * tileSize.x, (tv + 1) * tileSize.y);
quad[3].texCoords = sf::Vector2f(tu * tileSize.x, (tv + 1) * tileSize.y);
}
return true;
}
but recently i've appeared to want to load my tile map partial instead of loading all at once, so i modified it a bit to load a fixed rectangle of the map, then i can move the rectangle whenever i want to render the desired scene of the map. Quite simple, i think, but it didnt work, the map to be displayed didnt change after the vertex array already mapped to a difference rectangle. Why would this happen and how to solve it, any opinions would be appreciate, thanks in advance.
bool MapTexture::loadMap(const std::string& tileset){
if (test){// when i want to change my tile map i come here
if (!m_tileset.loadFromFile(tileset)) return false;
m_vertices.clear(); // i even cleard the array to make sure nothing remains
m_vertices.setPrimitiveType(sf::Quads);
unsigned int i,j;
float x = m_map->getSizeMap().x;
float y = m_map->getSizeMap().y;
m_vertices.resize(x*y*4);
for (i = 0; i < x; i++)
for (j = 5; j < y+5; j++)
{
float tx = m_map->getTileSize().x;
float ty = m_map->getTileSize().y;
int t = i+j*x;
int tileValue = 1;
int tCol;
if (tileValue <= 0) continue;
else{
tCol = (tileValue % static_cast<int>(m_tileset.getSize().x/tx)); // calculate position of the texture
//Here i mess things up, it suppose to have a ridiculous look but nothing happens at all
sf::Vertex* quad = &m_vertices[(i + j * x - 5*x) * 4];
quad[0].position = sf::Vector2f(i*tx,j*ty+5*ty);
quad[1].position = sf::Vector2f((i+1)*tx,j*ty+5*ty);
quad[2].position = sf::Vector2f((i+1)*tx,(j+1)*ty+5*ty);
quad[3].position = sf::Vector2f(i*tx,(j+1)*ty+5*ty);
quad[0].texCoords = sf::Vector2f(tCol*tx, 0);
quad[1].texCoords = sf::Vector2f((tCol+1)*tx,0);
quad[2].texCoords = sf::Vector2f((tCol+1)*tx, 40);
quad[3].texCoords = sf::Vector2f(tCol*tx, 40);
}
}
}
else{ // normally i come here
if (!m_tileset.loadFromFile(tileset)) return false;
m_vertices.setPrimitiveType(sf::Quads);
unsigned int i,j;
float x = m_map->getSizeMap().x;
float y = m_map->getSizeMap().y;
m_vertices.resize(x*y*4);
for (i = 0; i < x; i++)
for (j = 0; j < y; j++)
{
float tx = m_map->getTileSize().x;
float ty = m_map->getTileSize().y;
int t = i+j*x;
int tileValue = m_map->getMap()[t];
int tCol;
if (tileValue <= 0) continue;
else{
tCol = (tileValue % static_cast<int>(m_tileset.getSize().x/tx)); // calculate position of the texture
sf::Vertex* quad = &m_vertices[(i + j * x) * 4];
quad[0].position = sf::Vector2f(i*tx,j*ty);
quad[1].position = sf::Vector2f((i+1)*tx,j*ty);
quad[2].position = sf::Vector2f((i+1)*tx,(j+1)*ty);
quad[3].position = sf::Vector2f(i*tx,(j+1)*ty);
quad[0].texCoords = sf::Vector2f(tCol*tx, 0);
quad[1].texCoords = sf::Vector2f((tCol+1)*tx,0);
quad[2].texCoords = sf::Vector2f((tCol+1)*tx, 40);
quad[3].texCoords = sf::Vector2f(tCol*tx, 40);
}
}
}
return true;
};
as you can see, when test = true, the test code is executed and actually it did executed, but the nothing changed in my view, i even tried to make some wrong code to make a clearly difference result but nothing happens at all, i have to suppose that when the vertex array is loaded into memory, the gpu cached it somewhere for later use and doesnt refer to the new one anymore, sounds stupid but i have no idea otherwise