Re: [hlcoders] Scope Sprites

[Sebastian Steinlechner]

Yes, it does... here's how I did it, I'm calling this from
HUD_DrawTransparentTriangles (well, not exactly this, it's somewhat
different in Poke646, but the idea & maths is the same):

--- snip ---

#define SCOPE_DISTANCE 10
#define M_PI   3.14159265358979323846

extern vec3_t v_angles, v_origin;

void CSniperScope::DrawScope( void )
{
 if( !fActive )
  return;

 cl_entity_t *player;

 // make sure the player is up and running
 player = gEngfuncs.GetLocalPlayer();
 if ( !player )
  return;

 // load sniper scope sprite if necessary
 if ( hsprSniperScope == 0 )
 {
  char sz[256];
  sprintf( sz, "sprites/scopeborder.spr" );
  hsprSniperScope = SPR_Load( sz );
 }

 vec3_t viewAngles, v_up, v_right, v_forward;

 gEngfuncs.GetViewAngles( viewAngles );
 AngleVectors( viewAngles, v_forward, v_right, v_up );

 // the sprite's origin
 vec3_t org = v_origin + v_forward * SCOPE_DISTANCE;

 // adjust size to fov (simple triangular maths)
 float fovadjust = tan( gHUD.m_iFOV / 360.0 * M_PI );
 float size = (SCOPE_DISTANCE + 1.0) * fovadjust; // little bigger than
necessary

 // use this to overlap the triangles a bit
 float pixel = size / 256.0;

 float r, g, b, brightness;

 r = g = b = brightness = 1.0;

 vec3_t temporg;

 // now set up triapi code
 gEngfuncs.pTriAPI->RenderMode( kRenderTransTexture );
 gEngfuncs.pTriAPI->CullFace( TRI_NONE );

 for( int i = 0; i < 4; i++ )
 {
  if ( !gEngfuncs.pTriAPI->SpriteTexture( (struct model_s
*)gEngfuncs.GetSpritePointer( hsprSniperScope ), i ))
  {
   return;
  }

  gEngfuncs.pTriAPI->Color4f( r, g, b , brightness);
  gEngfuncs.pTriAPI->Begin( TRI_QUADS );

  gEngfuncs.pTriAPI->Brightness( 1 );
  gEngfuncs.pTriAPI->TexCoord2f( 0, 1 );
  switch( i )
  {
   case 0: temporg = org + (v_right * -size); break;
   case 1: temporg = org; break;
   case 2: temporg = org + (v_right * -size) + (v_up * -size); break;
   case 3: temporg = org + (v_up * -size); break;
  }
  gEngfuncs.pTriAPI->Vertex3fv( temporg );

  gEngfuncs.pTriAPI->Brightness( 1 );
  gEngfuncs.pTriAPI->TexCoord2f( 0, 0 );
  switch( i )
  {
   case 0: temporg = org + (v_right * -size) + (v_up * size); break;
   case 1: temporg = org + (v_up * size); break;
   case 2: temporg = org + (v_right * -size) + (v_up * pixel); break;
   case 3: temporg = org; break;
  }
  gEngfuncs.pTriAPI->Vertex3fv( temporg );

  gEngfuncs.pTriAPI->Brightness( 1 );
  gEngfuncs.pTriAPI->TexCoord2f( 1, 0 );
  switch( i )
  {
   case 0: temporg = org + (v_up * size); break;
   case 1: temporg = org + (v_right * size) + (v_up * size); break;
   case 2: temporg = org; break;
   case 3: temporg = org + (v_right * size) + (v_up * pixel); break;
  }
  gEngfuncs.pTriAPI->Vertex3fv( temporg );

  gEngfuncs.pTriAPI->Brightness( 1 );
  gEngfuncs.pTriAPI->TexCoord2f( 1, 1 );
  switch( i )
  {
   case 0: temporg = org; break;
   case 1: temporg = org + (v_right * size); break;
   case 2: temporg = org + (v_up * -size); break;
   case 3: temporg = org + (v_right * size) + (v_up * -size); break;
  }
  gEngfuncs.pTriAPI->Vertex3fv( temporg );

  gEngfuncs.pTriAPI->End();
 }

}

-- snap --

cya,
TheTinySteini


----- Original Message -----
From: "Cortex" <[EMAIL PROTECTED]>
To: <[EMAIL PROTECTED]>
Sent: Monday, April 29, 2002 7:56 PM
Subject: Re: [hlcoders] Scope Sprites


I don't understand how you got it to work using TriApi ! How did you get the
coordinate of the polys you had to display ? It has to depend from the view
angles, don't they ?


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