GameDev.lv forums

Code: Select all

int xi=(int)(x*10),yi=(int)(y*10),zi=(int)(z*10);
pos_packet_0 = xi | (yi << 10) | (zi << 20);
Paka0->write(pos_packet_0,-100.0f,+100.0f,0.01f,SPW_PK);//SPW_PK = GameMessageID -130

Code: Select all

Paka0->writeInt(SPW_PK, 5);
Paka0->writeFloat(x,-100.0f,+100.0f,0.01f);
Paka0->writeFloat(y,-100.0f,+100.0f,0.01f);
Paka0->writeFloat(z,-100.0f,+100.0f,0.01f);

socket->send(Paka0->getBuffer(), Paka0->getBufferSize());

Code: Select all

bsOut.Write((RakNet::MessageID)GameMessageIDs);
	bsOut.Write((char*)buffer_1,BBC_1);//x
	bsOut.Write((char*)buffer_2,BBC_2);//y
	bsOut.Write((char*)buffer_3,BBC_3);//z

	peer->Send(&bsOut,HIGH_PRIORITY,RELIABLE_ORDERED,0,packet->systemAddress,false);

Code: Select all

You can also write bits. Most of the time you will not care about this.

Code: Select all

#include <string.h>
#include <assert.h>
#include <math.h>
#include <stdio.h>

class BitBuffer
{
public:
    BitBuffer()
    {
        reset();
    }
    
    void reset()
    {
        pos = 0;
        maxPos = 8*MAX_BYTE_COUNT;
        memset(buf, 0, sizeof(buf));
    }
    
    void assign(const unsigned char* bytes, int byteCount)
    {
        assert(byteCount <= MAX_BYTE_COUNT);
        
        pos = 0;
        maxPos = byteCount * 8;
        memcpy(buf, bytes, byteCount);
    }
    
    void writeInt(unsigned int x, int bits)
    {
        assert(bits <= 32);
        assert(x < (1U<<bits));

        for (int i=0; i<bits; i++)
        {
            putBit((x >> i) & 1);
        }
    }
    
    void writeFloat(float x, float min, float max, float prec)
    {
        assert(x >= min && x <= max);

        int bits = (int)ceilf(logf((max - min) / prec) / logf(2.0f));
        writeInt((unsigned int)(0.5f + (x - min) / prec), bits);
    }
    
    unsigned int readInt(int bits)
    {
        assert(bits <= 32);

        unsigned int x = 0;
        for (int i=0; i<bits; i++)
        {
            x |= getBit() << i;
        }
        return x;
    }
    
    float readFloat(float min, float max, float prec)
    {
        int bits = (int)ceilf(logf((max - min) / prec) / logf(2.0f));
        return min + readInt(bits) * prec;
    }
    
    const unsigned char* getBuffer() const
    {
        return buf;
    }
    
    unsigned int getBufferSize() const
    {
        return (pos+7)/8;
    }
    
private:
     void putBit(int bit)
     {
         buf[pos/8] |= bit << (pos%8);
         pos++;
         
         assert(pos < maxPos);
     }
     
     int getBit()
     {
         assert(pos < maxPos);

         int bit = buf[pos/8] >> (pos%8);
         pos++;
         return bit & 1;
     }
     
     static const int MAX_BYTE_COUNT = 128; // max 1024 bits
     unsigned char buf[MAX_BYTE_COUNT];

     int pos;
     int maxPos;
};


int main()
{
    BitBuffer packet2;

    {
        int id = 12;
        float x = 1.0f;
        float y = -55.5f;
        float z = 77.0f;

        BitBuffer packet;

        packet.writeInt(id, 4); // id = [0..15]
        packet.writeFloat(x, -100.0f, +100.0f, 0.1f);
        packet.writeFloat(y, -100.0f, +100.0f, 0.1f);
        packet.writeFloat(z, -100.0f, +100.0f, 0.1f);

        // te suuti otrai pusei
        //socket->write(buf1.getBuffer(), buf1.getBufferSize());
        
        // otraa puse sanjem un ieraksti buferii
        packet2.assign(packet.getBuffer(), packet.getBufferSize());
    }

    int id;
    float x, y, z;

    id = packet2.readInt(4);
    x = packet2.readFloat(-100.0f, +100.0f, 0.1f);
    y = packet2.readFloat(-100.0f, +100.0f, 0.1f);
    z = packet2.readFloat(-100.0f, +100.0f, 0.1f);

    printf("%i %.1f %.1f %.1f\n", id, x, y, z);
   
}

Code: Select all

class Socket {

    // aizsūta no buffer bufera size baitus
    void Write(const unsigned char* buffer, unsigned int size);

    // mēģina nolasīt maxSize baitus buferī, un atgriež nolasīto baitu skaitu
    int Read(unsigned char* buffer, unsigned int maxSize);
}

Code: Select all

BitBuffer buf;
buf.writeInt(id, 5);
buf.writeFloat(x, ...);

socket->Write(buf.getBuffer(), buf.getBufferSize());

Code: Select all

unsigned char temp[100]; // cik nu tev tur max baiti atnāk no tīkla
int size = socket->Read(temp, sizeof(temp));
BitBuffer buf;
buf.assign(temp, size);

id = buf.readInt(5);
x = buf.readFloat(...);

Code: Select all

bsIn.Read((char*)temp,sizeof(temp)); 

Code: Select all

bsIn.Read((char*)temp,sizeof((char*)temp)); 

Code: Select all

bsIn.Read((char*)temp,sizeof((char*)temp)+1); 

Code: Select all

#include <stdio.h>

int main()
{
    char c;
    char* buf;
    char big[100];

    printf("%i\n", sizeof(c));
    printf("%i\n", sizeof(buf));
    printf("%i\n", sizeof(big));
}