Messages

1

Graphics / Re: GetPixel() in 2.1?

« on: January 20, 2014, 12:51:50 am »

I did this and in release configuration everything works much better. Also now I use const& every time when possible. But I think it can be optimised further and it may start lagging when thee will be like 3 layers on the map.

And you should make sure you don't copy unnecessarily. For example, pass sf::Image and std::string by const-reference, not by value. You could also make isClickable() const, i.e. use map::find() instead of map::operator[].

Isn't operator[] faster than find()?

TY again!

2

Graphics / Re: GetPixel() in 2.1?

« on: January 18, 2014, 10:55:37 pm »

Hi Nexus, thank you for your reply.
I thought about 1bpp data and I've tried but FPS actually lower than with simple Image->getPixel(x,y). Maybe I'm doing something wrong?

std::map<std::string, std::vector<bool>> bitsets; //string contains texture name

after loading the image & texture I create the bitset for this texture:

bitsets[texturename] = calculateBitset(images[texturename]);

std::vector<bool> calculateBitset(sf::Image img){
        sf::Vector2u imgSize = img.getSize();
        std::vector<bool> retVal;
        for(int i = 0; i < imgSize.x; i++){
                for(int j = 0; j < imgSize.y; j++){
                        retVal.push_back(img.getPixel(i,j).a != 255); //false = transparent
                }
        }
        return retVal;
}

then I check if given point is clickable:

bool isClickable(std::string textureName, sf::Vector2u pos){
        int w = images[textureName].getSize().x;
        return !bitsets[textureName][w*pos.y+pos.x];
}

With this code I'm experiencing 6-20 FPS drop (depending on map indexes)

If I load and store only sf::Images and call getPixel() every time, FPS drop is only 1-6 and equally lower cpu load.

3

Graphics / Re: GetPixel() in 2.1?

« on: January 18, 2014, 07:27:05 pm »

I see. Then you could try:
http://sfml-dev.org/documentation/2.1/classsf_1_1Texture.php#aefc19bcd95565dd2348fd4cec0facddc

Ha-ha, actually I came to such idea by myself like 40 minutes ago but I kinda missed the copyToImage()
Thanks, I'll give it a try!
---

                        if(tiles[i][j].getGlobalBounds().contains(pos)){
                                sf::Image img = tiles[i][j].getTexture()->copyToImage();
                                sf::Vector2f tilePos = tiles[i][j].getPosition();
                                sf::Color c = img.getPixel(pos.x - tilePos.x, pos.y - tilePos.y);
                                if(c.a != 0){
                                        std::cout<<"Selected tile @ "<<i<<", "<<j<<std::endl;
                                        return;
                                }
                        }

Idk how this solution impacts performance-wise, with 10k tiles it works well. Maybe I should store all images for all of my textures separately.
Thanks again!~

4

Graphics / Re: GetPixel() in 2.1?

« on: January 18, 2014, 02:37:51 pm »

If I understand this correctly, it'll work out just for tiles. But they're all the same size. What if there are different shaped objects? for ex. a tree sprite? Bounding box wont let to click behind and will catch clicks on that tree - that's why I thought about excluding transparent pixels.

5

Graphics / GetPixel() in 2.1?

« on: January 18, 2014, 01:17:36 pm »

Hello!
What am I trying to do is to invent a bicycle make a click detection on isometric tiles. My current approach:

Map::ClickOn(sf::Vector2f pos){
        for(int i = 0; i < 100; i++){
                for(int j = 0; j < 100; j++){
                        if(tiles[i][j].getGlobalBounds().contains(pos)){
                                std::cout<<"Selected tile @ "<<i<<", "<<j<<std::endl;
                                return;
                        }
                }
        }

where 'pos' is the mouse click position. In 3D I'd simply cast a ray but with 2D there are overlapping bounding boxes so it often detects neighbouring tiles.
I thought that I can get all sprites with their bounding boxes are within 'pos' and omit the ones with transparent pixels on click position. sf::Sprite had GetPixel(x,y) method back in 1.6 but now it's gone. Is there any ways to check the color of sprite's each pixel? Or maybe a simplier approach to solve this problem?

TY!

6

Network / How to make my program wait for establishing the connection?

« on: December 13, 2011, 02:27:32 pm »

Lol!
Fixed that by

Code: [Select]

   Client.SetBlocking(true);
    if(Client.Connect(7777, host, 5.f)!=sf::Socket::Done)
        std::cout<<"Connection Error"<<std::endl;
    Client.SetBlocking(false);
and now everything is OK!

7

Network / How to make my program wait for establishing the connection?

« on: December 13, 2011, 01:16:25 pm »

My socket is set to non-blocking.
Client.SetBlocking(false);
When I set it to true, the client hangs. How do I correctly receive packets?
I have HandlePackets() in my main loop:

Code: [Select]

void HandlePackets(){
    while(Client.Receive(packet)==Socket::Done){
            unsigned short PacketID;
            packet >> PacketID;
            switch(PacketID){
                case 0:
                    Func0();
                    break;
                case 1:
                    Func1();
                    break;
                case 2:
                    Func2();
                    break;
                case 3:
                    Func3();
                    break;
                default:
                     break;
            }
        }
}

8

Network / How to make my program wait for establishing the connection?

« on: December 07, 2011, 08:40:30 pm »

Thanks for reply.

Well, this is what happens when I run code 1:
I press "Login".
Nothing happens but my server says that client has connected.
I press "Login" one more time.
The packet with username and password is delivered successfully.

and with code 2:
I press "Login".
Server says that client has connected.
3-4 seconds passess while counting to 5000.
The packet is delivered.

or you suggested to make something like while(client.connect(port,host)!=Socket::Done) waiting loop?
please forgive my noobing :roll:

9

Network / How to make my program wait for establishing the connection?

« on: December 07, 2011, 02:59:53 pm »

Hello.
My SFML-Network works fine on LAN but there is a problem connecting to remote host on the Internet. It seems that my code trying to send a packet immediately after the connection attempt (program needs more time to connect).
My code:

Code: [Select]

if(Client.Connect(7777, host)!=Socket::Done){
  std::cout<<"Connection Error"<<std::endl;
}

Next goes the sending the first packet.
There is no problem with this code (print to 5000 delays my app for 3-4 seconds):

Code: [Select]

   if(Client.Connect(7777, host)){
       while(i<5000){
           std::cout<<i<<std::endl;
           i++;
       }
    }
How do I delay my program for the time needed to connect to remote host?