//start of frame      //object step code etc      //enter the drawing phase      //clear the screen and z-buffer      GL_clear();            //draw events      glLoadIdentity();            //camera       //glTranslatef(0,-16,-128); (this is the same as -camera.x etc, just added a class to it below for ease)      //not working with the frustum yet, I will leave that for another time      glTranslatef(-camera.x,-camera.y,-camera.z); //basic camera implementation      glRotatef(camera.pitch,1,0,0);      glRotatef(camera.yaw,0,1,0);              //floor      glPushMatrix(); //don't really need this do I?        glCallList(ground); //coloured + checkered platform to test blending      glPopMatrix();	          //draw particles      glDepthMask(false); //disable updating the z-buffer      glEnable(GL_BLEND); //enable blending    	      //test particle      glTranslatef(0,partY,0); //positioning (no rotation yet, make it "2d"?)      glBlendFunc(GL_DST_COLOR,GL_ZERO); //blend the mask      glBindTexture(GL_TEXTURE_2D,partOrbMask.texture);      glCallList(part); //draws the quad      //the next bit is sort of what I mean by double pass (the non-single pass bit being the mask above)          glColor4f(1,0,0,0.2); //translucent + red      glBindTexture(GL_TEXTURE_2D,partOrb.texture); //inverted form of the mask      glBlendFunc(GL_ONE,GL_ONE); //blend the particle      glCallList(part); //draws the quad              glDisable(GL_BLEND); //no blending (back to opaque)      glDepthMask(true); //did I need to change this? or is it causing issues?      glColor4f(1,1,1,1); //white,opaque            //end of frame      //get input etc

class texture{  public:  GLuint texture;  int width,height;    bool loadRAW(char* path,int w = 128,int h = 128){    width = w;    height = h;        BYTE * data[width * height * 3]; //3 bytes per pixel    FILE * file;        //open and read texture data    file = fopen(path,"rb"); //attempt to open the file    if(!file) //check the file could be opened      return false;        fread(data, width * height * 3, 1, file); //copy file contents into the buffer    fclose(file); //close the file        //allocate a texture resource    glGenTextures(1,&texture);    /*    if(repeat){ //if it repeats      //set as repeating      glTexParameterf(GL_TEXTURE_2D,GL_TEXTURE_WRAP_S,GL_REPEAT);      glTexParameterf(GL_TEXTURE_2D,GL_TEXTURE_WRAP_T,GL_REPEAT);    }        //set filtering    glTexParameterf(GL_TEXTURE_2D,GL_TEXTURE_MAG_FILTER,filtering);    */    //set as target    glBindTexture(GL_TEXTURE_2D,texture);    //set texture data    gluBuild2DMipmaps(GL_TEXTURE_2D,3,width,height,GL_RGB,GL_UNSIGNED_BYTE,data);           //free buffer    free(data);        return true;  }};