Learning opengl from mu online.

[Pinkof]

Well i was decompiling some function where draw effects or image via opengl functions is very old,but well is for learn..
at this moment i just have 2 functions

DrawImage and DrawEffect?

well here have the source code to know how draw image or some effects in muonline

void CINTERFACE::DrawImage(int InterFaceId,float PosX,float PosY,float Width,float Height,float StartX,float StartY,float ScaleTextureX,float ScaleTextureY)
{
 
glPushMatrix(); //push a matrix para que no gire toda la pantalla solo el objeto


float x = float(*(WORD*)0x6105F8)*PosX*0.001562500f; //0x6105F8  = Screen width
float y = float(*(WORD*)0x6105FC)*PosY*0.002083333;//0x6105FC  = Screen height
float widthy = float(*(WORD*)0x6105FC)-y;
pSetTexture(InterFaceId); //set texture image



CVector2 cVec[4];
cVec[0].X = x;
cVec[0].Y = widthy;


cVec[1].X = x;
cVec[1].Y = widthy-Height;


cVec[2].X = x+Width;
cVec[2].Y = widthy-Height;


cVec[3].X = x+Width;
cVec[3].Y = widthy;


CVector2 cVecTexture[4];
cVecTexture[0].X = StartX;
cVecTexture[0].Y = StartY;


cVecTexture[1].X = StartX;
cVecTexture[1].Y = ScaleTextureY+StartY;


cVecTexture[2].X = ScaleTextureX+StartX;
cVecTexture[2].Y = ScaleTextureY+StartY;


cVecTexture[3].X = ScaleTextureX+StartX;
cVecTexture[3].Y = StartY;


glBegin(GL_TRIANGLE_FAN);


for(int i = 0; i<4;i++)
{
glTexCoord2f(cVecTexture[i].X,cVecTexture[i].Y);
glVertex2f(cVec[i].X,cVec[i].Y);
}


glEnd();
glPopMatrix();
}

void SetTextureCoord(CVector2* TextureCoor,float CoorX,float CoorY)
{
TextureCoor->X = CoorX;
TextureCoor->Y = CoorY;
}


void SetVertex(CVector3 *lpVertex, CVector3 *a2)
{
   float PosX = lpVertex->X * 0.017453292;
   float PosY = lpVertex->Y * 0.017453292;
  float PosZ = lpVertex->Z * 0.017453292;


  a2->X = cos(PosY) * cos(PosZ);
  a2->Y = cos(PosY) * sin(PosZ);
  a2->Z = -sin(PosY);


  a2[1].X = 0;
  a2[1].Y = (sin(PosX) * sin(PosY) ) * cos(PosZ) - cos(PosX) * sin(PosZ);
  a2[1].Z =  (sin(PosX) * sin(PosY) ) * sin(PosZ) + cos(PosX) * cos(PosZ);
  
  a2[2].X = sin(PosX) * cos(PosY);
  a2[2].Y = 0;
  a2[2].Z = (cos(PosX) * sin(PosY)) * cos(PosZ) + sin(PosX) * sin(PosZ);
 
  a2[3].X = (cos(PosX) * sin(PosY)) *  sin(PosZ) - sin(PosX) * cos(PosZ);
  a2[3].Y =  cos(PosX) * cos(PosY);
  a2[3].Z = 0;
}


void SetVertextCoor(CVector3 *Size, CVector3 *a2, CVector3 *lpVertex)
{


  lpVertex->X = a2->Y * Size->Y + a2->Z * Size->Z + Size->X * a2->X;
  lpVertex->Y = a2[1].Y * Size->X + a2[1].Z * Size->Y + a2[2].X * Size->Z;
  lpVertex->Z = a2[2].Z * Size->X + a2[3].X * Size->Y + a2[3].Y * Size->Z;
  return;
}

//Draw effect in select character when a character is selected.
void COPENGL::DrawEffect(int EffectId,CVector3 * lpPosition,float Size,float Width, float Height,float a6,float a7,float a8)
{
  pSetTexture(EffectId); //set texture


  CVector3 Color3f[4];


  Color3f[0].X = 1.0f;
  Color3f[0].Y = 1.0f;
  Color3f[0].Z = 1.0f;


  Color3f[1].X = 1.0f;
  Color3f[1].Y = 1.0f;
  Color3f[1].Z = 1.0f;


  Color3f[2].X = a7;
  Color3f[2].Y = a7;
  Color3f[2].Z = a7;


  Color3f[3].X = a7;
  Color3f[3].Y = a7;
  Color3f[3].Z = a7;


  CVector2 TextureCoor[4];


 for(float x = 0; x<12;x++)
 {
 
    float CoorX = x * 0.083333336;
    SetTextureCoord(&TextureCoor[0], CoorX, 1.0f);
   CoorX = (x+1.0f) * 0.083333336;
    SetTextureCoord(&TextureCoor[1], CoorX, 1.0f);
    SetTextureCoord(&TextureCoor[2], CoorX, 0);
CoorX = x * 0.083333336;
    SetTextureCoord(&TextureCoor[3], CoorX, 0);
CVector3 cVector;
CVector3 Vertex3f[4];
cVector.X = 0;
cVector.Y = 0;
cVector.Z = x*30.0f+a6;
    SetVertex(&cVector, &Vertex3f[0]);
    cVector.Z = (x+1.0f) * 30.0 + a6;
CVector3 Vertex3f2[4];
    SetVertex(&cVector, &Vertex3f2[0]);


CVector3 vsize;
vsize.X = 0;
vsize.Y = Size;
vsize.Z = 0;
   
CVector3 cVertextCoor[4];


    SetVertextCoor(&vsize, &Vertex3f[0], &cVertextCoor[0]);
    cVertextCoor[0].X = cVertextCoor[0].X + lpPosition->X;
cVertextCoor[0].Y = cVertextCoor[0].Y + lpPosition->Y;
cVertextCoor[0].Z = cVertextCoor[0].Z + lpPosition->Z;
vsize.X = 0;
    vsize.Y = Size;
vsize.Z = 0.0;
    SetVertextCoor(&vsize, &Vertex3f2[0], &cVertextCoor[1]);
cVertextCoor[1].X = cVertextCoor[1].X + lpPosition->X;
cVertextCoor[1].Y = cVertextCoor[1].Y + lpPosition->Y;
cVertextCoor[1].Z = cVertextCoor[1].Z + lpPosition->Z;
    
vsize.X = 0;
    vsize.Y = Width;
vsize.Z = Height;
    SetVertextCoor(&vsize, &Vertex3f2[0], &cVertextCoor[2]);


cVertextCoor[2].X = cVertextCoor[2].X + lpPosition->X;
cVertextCoor[2].Y = cVertextCoor[2].Y + lpPosition->Y;
cVertextCoor[2].Z = cVertextCoor[2].Z + lpPosition->Z;
 
    vsize.X = 0;
    vsize.Y = Width;
vsize.Z = Height;


    SetVertextCoor(&vsize, &Vertex3f[0], &cVertextCoor[3]);
    cVertextCoor[3].X = cVertextCoor[3].X + lpPosition->X;
cVertextCoor[3].Y = cVertextCoor[3].Y + lpPosition->Y;
cVertextCoor[3].Z = cVertextCoor[2].Z + lpPosition->Z;
  glBegin(GL_QUADS);
   for(int i = 0;i<4;i++)
   {
   glBegin(GL_QUADS);
      glTexCoord2f(TextureCoor[i].X, TextureCoor[i].Y+a8);
      glColor3fv((GLfloat*)&Color3f[i]);
      glVertex3fv((GLfloat *)&cVertextCoor[i]);
     
    }
    glEnd();
  }


}

//used to draw hp bar or line simples

void CINTERFACE::DrawVector(float PosX,float PosY,float Width,float Height)
{

float NewPosX = float(*(WORD*)0x6105F8)*PosX*0.001562500f;
float NewPosY = float(*(WORD*)0x6105FC)*PosY*0.0020833334f;
float widthy = float(*(WORD*)0x6105FC)-NewPosY;

sub_5B12D0(0);


CVector2 cVec[4];
cVec[0].X = NewPosX;
cVec[0].Y = widthy;


cVec[1].X = NewPosX;
cVec[1].Y = widthy-Height;


cVec[2].X = NewPosX+Width;
cVec[2].Y = widthy-Height;


cVec[3].X = NewPosX+Width;
cVec[3].Y = widthy;


glBegin(GL_TRIANGLE_FAN);


for(int i = 0; i<4;i++)
{
glVertex2f(cVec[i].X,cVec[i].Y);
}
glEnd();

}

 

[myheart]

and you can check IGC source for code draw text.

 

[MaxMuON]

and you can check IGC source for code draw text.

How ? Because when i execute :
g_Font[ARIAL_14]->DrawColor(300, 400, RGBA(255, 255, 255, 255), "test" );
I m not seeing the test at 300x400.