land_shipyard.c

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/*
 * See Licensing and Copyright notice in naev.h
 */
#include <math.h>
#include <stdio.h>
#include <stdlib.h>
 
#include "naev.h"
 
#include "land_shipyard.h"
 
#include "array.h"
#include "cond.h"
#include "dialogue.h"
#include "hook.h"
#include "land.h"
#include "naevpedia.h"
#include "nstring.h"
#include "player.h"
#include "slots.h"
#include "space.h"
#include "tk/toolkit_priv.h"
#include "toolkit.h"
 
#define SHIP_GFX_SIZE 256 

typedef struct CstShipSlotWidget_ {
   int                   mouseover;
   const ShipOutfitSlot *slot;
   double                altx;
   double                alty;
} CstShipSlotWidget;

typedef struct CstShipPreview {
   int    mousedown;
   GLuint fbo;
   GLuint tex;
   double dir;
   double updown;
} CstShipPreview;
 
/*
 * Vars.
 */
static Ship **shipyard_list =
   NULL; 
static Ship *shipyard_selected = NULL; 
 
/*
 * Helper functions.
 */
static int  shipyard_canAcquire( const Ship *ship, const Spob *spob,
                                 credits_t price );
static void shipyard_buy( unsigned int wid, const char *str );
static void shipyard_trade( unsigned int wid, const char *str );
static void shipyard_rmouse( unsigned int wid, const char *widget_name );
static void shipyard_renderSlots( double bx, double by, double bw, double bh,
                                  void *data );
static void shipyard_renderSlotsRow( double bx, double by, double bw,
                                     const char *str, ShipOutfitSlot *s );
static int  shipyard_mouseSlots( unsigned int wid, const SDL_Event *event,
                                 double x, double y, double w, double h,
                                 double rx, double ry, void *data );
static void shipyard_renderSlotsOver( double bx, double by, double bw,
                                      double bh, void *data );
static void shipyard_naevpedia( unsigned int wid, const char *str );
/* Preview. */
static void preview_free( void *ptr );
static void preview_render( double x, double y, double w, double h,
                            void *data );
static int  preview_mouse( unsigned int wid, const SDL_Event *event, double x,
                           double y, double w, double h, double rx, double ry,
                           void *data );
static void preview_focusLose( unsigned int wid, const char *wgtname );

void shipyard_open( unsigned int wid )
{
   ImageArrayCell    *cships;
   int                nships;
   int                w, h, sw, sh;
   int                iw, ih;
   int                bw, bh, padding, off;
   int                iconsize;
   CstShipSlotWidget *data;
 
   /* Mark as generated. */
   land_tabGenerate( LAND_WINDOW_SHIPYARD );
 
   /* Init vars. */
   shipyard_cleanup();
 
   /* Get window dimensions. */
   window_dimWindow( wid, &w, &h );
 
   /* Calculate image array dimensions. */
   iw = 440 + ( w - LAND_WIDTH );
   ih = h - 60;
 
   /* Ship image dimensions. */
   sw = SHIP_GFX_SIZE;
   sh = SHIP_GFX_SIZE;
 
   /* Left padding + per-button padding * nbuttons */
   padding = 40 + 20 * 4;
 
   /* Calculate button dimensions. */
   bw = MIN( LAND_BUTTON_WIDTH, ( w - iw - padding ) / 4 );
   bh = LAND_BUTTON_HEIGHT;
 
   /* buttons */
   off = -20;
   window_addButtonKey( wid, off, 20, bw, bh, "btnCloseShipyard",
                        _( "Take Off" ), land_buttonTakeoff, SDLK_t );
   off -= 20 + bw;
   window_addButtonKey( wid, off, 20, bw, bh, "btnTradeShip", _( "Trade-In" ),
                        shipyard_trade, SDLK_r );
   off -= 20 + bw;
   window_addButtonKey( wid, off, 20, bw, bh, "btnBuyShip", _( "Buy" ),
                        shipyard_buy, SDLK_b );
   off -= 20 + bw;
   window_addButtonKey( wid, off, 20, bw, bh, "btnNaevpediaOutfits",
                        _( "Archives" ), shipyard_naevpedia, SDLK_a );
 
   /* ship review */
   window_addRect( wid, -40 + 4, -40 + 4, sw + 8, sh + 8, "rctTarget", &cBlack,
                   1 );
   CstShipPreview *pre = calloc( 1, sizeof( CstShipPreview ) );
   gl_fboCreate( &pre->fbo, &pre->tex, sw / gl_screen.scale,
                 sh / gl_screen.scale );
   window_addCust( wid, -40, -40, sw, sh, "cstPreview", 0, preview_render,
                   preview_mouse, NULL, preview_focusLose, pre );
   window_custFreeDataFunc( wid, "cstPreview", preview_free );
   window_custSetClipping( wid, "cstPreview", 0 );
 
   /* slot types */
   data = calloc( 1, sizeof( CstShipSlotWidget ) );
   window_addCust( wid, -20, -sh - 50, sw - 10, 80, "cstSlots", 0.,
                   shipyard_renderSlots, shipyard_mouseSlots, NULL, NULL,
                   data );
   window_custSetOverlay( wid, "cstSlots", shipyard_renderSlotsOver );
   window_custSetClipping( wid, "cstSlots", 0 );
   window_canFocusWidget( wid, "cstSlots", 0 );
   window_custFreeDataFunc( wid, "cstSlots", free );
 
   /* stat text */
   window_addText( wid, -4, -sw - 50 - 70 - 20, sw, -sh - 60 - 70 - 20 + h - bh,
                   0, "txtStats", &gl_smallFont, NULL, NULL );
 
   /* Placeholder text-boxes, calculated properly in shipyard_update(). */
   window_addText( wid, iw + 40, -35, 133, 427, 0, "txtSDesc", &gl_defFont,
                   &cFontGrey, NULL );
   window_addText( wid, iw + 173, -35, w - sw - iw - 208, 427, 0, "txtDDesc",
                   &gl_defFont, NULL, NULL );
   window_addText( wid, 20 + iw + 20, -462, w - ( iw + 40 ) - ( sw + 40 ),
                   -482 + h - bh, 0, "txtDescription", &gl_defFont, NULL,
                   NULL );
 
   /* set up the ships to buy/sell */
   shipyard_list = tech_getShip( land_spob->tech );
   nships        = array_size( shipyard_list );
   cships        = calloc( MAX( 1, nships ), sizeof( ImageArrayCell ) );
   if ( nships <= 0 ) {
      cships[0].image   = NULL;
      cships[0].caption = strdup( _( "None" ) );
      nships            = 1;
   } else {
      /* Threaded loading of graphics for speed. */
      int needsgfx = 0;
      for ( int i = 0; i < nships; i++ ) {
         Ship *s = (Ship *)shipyard_list[i];
         if ( !ship_gfxLoaded( s ) ) {
            s->flags |= SHIP_NEEDSGFX;
            needsgfx = 1;
         }
      }
      if ( needsgfx )
         ship_gfxLoadNeeded();
 
      /* Properly create the array. */
      for ( int i = 0; i < nships; i++ ) {
         cships[i].caption = strdup( _( shipyard_list[i]->name ) );
         cships[i].image   = ship_gfxStore( shipyard_list[i], 256, 0., 0., 0. );
         cships[i].layers  = gl_copyTexArray( shipyard_list[i]->gfx_overlays );
         if ( shipyard_list[i]->rarity > 0 ) {
            glTexture *t     = rarity_texture( shipyard_list[i]->rarity );
            cships[i].layers = gl_addTexArray( cships[i].layers, t );
         }
      }
   }
 
   iconsize = 128;
   if ( !conf.big_icons ) {
      if ( toolkit_simImageArrayVisibleElements( iw, ih, iconsize, iconsize ) <
           nships )
         iconsize = 96;
      /*
      if (toolkit_simImageArrayVisibleElements(iw,ih,iconsize,iconsize) <
      nships) iconsize = 64;
      */
   }
   window_addImageArray( wid, 20, 20, iw, ih, "iarShipyard", iconsize, iconsize,
                         cships, nships, shipyard_update, shipyard_rmouse,
                         NULL );
 
   /* write the shipyard stuff */
   shipyard_update( wid, NULL );
   /* Set default keyboard focuse to the list */
   window_setFocus( wid, "iarShipyard" );
}

void shipyard_update( unsigned int wid, const char *str )
{
   (void)str;
   int   i, tw, th, y, w, h, sw, iw, bh;
   Ship *ship;
   char  lbl[STRMAX], buf[STRMAX], buf_price[ECON_CRED_STRLEN],
      buf_credits[ECON_CRED_STRLEN];
   size_t k = 0, l = 0;
   int    blackmarket = ( ( land_spob != NULL ) &&
                       spob_hasService( land_spob, SPOB_SERVICE_BLACKMARKET ) );
 
   i = toolkit_getImageArrayPos( wid, "iarShipyard" );
 
   /* No ships */
   if ( i < 0 || array_size( shipyard_list ) == 0 ) {
      window_disableButton( wid, "btnBuyShip" );
      window_disableButton( wid, "btnTradeShip" );
      window_modifyText( wid, "txtStats", NULL );
      window_modifyText( wid, "txtDescription", NULL );
      window_modifyText( wid, "txtSDesc", NULL );
      window_modifyText( wid, "txtDDesc", NULL );
      return;
   }
 
   ship              = shipyard_list[i];
   shipyard_selected = ship;
 
   /* update image */
   CstShipPreview *p = window_custGetData( wid, "cstPreview" );
   p->dir            = 0.;
   p->updown         = 0.;
   ship_renderGfxStore( p->fbo, shipyard_selected, SHIP_GFX_SIZE, p->dir,
                        p->updown, 0. );
   window_custSetDynamic( wid, "cstPreview",
                          ship_gfxAnimated( shipyard_selected ) );
 
   /* update text */
   window_modifyText( wid, "txtStats", ship->desc_stats );
   price2str( buf_price, ship_buyPrice( ship ), player.p->credits, 2 );
   credits2str( buf_credits, player.p->credits, 2 );
 
   k += scnprintf( &lbl[k], sizeof( lbl ) - k, "%s", _( "Model:" ) );
   l += scnprintf( &buf[l], sizeof( buf ) - l, "%s", _( ship->name ) );
   k += scnprintf( &lbl[k], sizeof( lbl ) - k, "\n%s", _( "Class:" ) );
   l += scnprintf( &buf[l], sizeof( buf ) - l, "\n%s",
                   _( ship_classDisplay( ship ) ) );
   k += scnprintf( &lbl[k], sizeof( lbl ) - k, "\n%s", _( "Fabricator:" ) );
   l += scnprintf( &buf[l], sizeof( buf ) - l, "\n%s", _( ship->fabricator ) );
   k += scnprintf( &lbl[k], sizeof( lbl ) - k, "\n%s", _( "Crew:" ) );
   l += scnprintf( &buf[l], sizeof( buf ) - l, "\n%d", ship->crew );
   if ( player.fleet_capacity > 0 ) {
      k += scnprintf( &lbl[k], sizeof( lbl ) - k, "\n%s",
                      _( "Fleet Capacity:" ) );
      l += scnprintf( &buf[l], sizeof( buf ) - l, "\n%d", ship->points );
   }
   /* Weapons & Manoeuvrability */
   k +=
      scnprintf( &lbl[k], sizeof( lbl ) - k, "\n\n%s", _( "Base Properties" ) );
   l += scnprintf( &buf[l], sizeof( buf ) - l, "\n\n%s", "" );
   if ( ship->cpu > 0 ) {
      k += scnprintf( &lbl[k], sizeof( lbl ) - k, "\n%s", _( "CPU:" ) );
      l += scnprintf( &buf[l], sizeof( buf ) - l, "\n%.0f %s", ship->cpu,
                      UNIT_CPU );
   }
   if ( ship->mass ) {
      char buf_mass[ECON_MASS_STRLEN];
      tonnes2str( buf_mass, ship->mass );
      k += scnprintf( &lbl[k], sizeof( lbl ) - k, "\n%s", _( "Mass:" ) );
      l += scnprintf( &buf[l], sizeof( buf ) - l, "\n%s", buf_mass );
   }
   if ( ship->accel ) {
      k += scnprintf( &lbl[k], sizeof( lbl ) - k, "\n%s", _( "Accel:" ) );
      l += scnprintf( &buf[l], sizeof( buf ) - l, "\n" );
      l += scnprintf( &buf[l], sizeof( buf ) - l, _( "%.0f %s" ), ship->accel,
                      UNIT_ACCEL );
   }
   if ( ship->speed ) {
      k += scnprintf( &lbl[k], sizeof( lbl ) - k, "\n%s", _( "Speed:" ) );
      l += scnprintf( &buf[l], sizeof( buf ) - l, "\n" );
      l += scnprintf( &buf[l], sizeof( buf ) - l, _( "%.0f %s" ), ship->speed,
                      UNIT_SPEED );
   }
   if ( ship->turn ) {
      k += scnprintf( &lbl[k], sizeof( lbl ) - k, "\n%s", _( "Turn:" ) );
      l += scnprintf( &buf[l], sizeof( buf ) - l, "\n" );
      l += scnprintf( &buf[l], sizeof( buf ) - l, _( "%.0f %s" ),
                      ship->turn * 180 / M_PI, UNIT_ROTATION );
   }
   if ( ship->dt_default != 1. ) {
      k +=
         scnprintf( &lbl[k], sizeof( lbl ) - k, "\n%s", _( "Time Constant:" ) );
      l += scnprintf( &buf[l], sizeof( buf ) - l, "\n%.0f%%",
                      ship->dt_default * 100. );
   }
   /* Misc */
   if ( ship->dmg_absorb ) {
      k += scnprintf( &lbl[k], sizeof( lbl ) - k, "\n%s", _( "Absorption:" ) );
      l += scnprintf( &buf[l], sizeof( buf ) - l, "\n" );
      l += scnprintf( &buf[l], sizeof( buf ) - l, _( "%.0f%% damage" ),
                      ship->dmg_absorb * 100. );
   }
   if ( ship->shield || ship->shield_regen ) {
      k += scnprintf( &lbl[k], sizeof( lbl ) - k, "\n%s", _( "Shield:" ) );
      l += scnprintf( &buf[l], sizeof( buf ) - l, "\n" );
      l +=
         scnprintf( &buf[l], sizeof( buf ) - l, _( "%.0f %s (%.1f %s)" ),
                    ship->shield, UNIT_ENERGY, ship->shield_regen, UNIT_POWER );
   }
   if ( ship->armour || ship->armour_regen ) {
      k += scnprintf( &lbl[k], sizeof( lbl ) - k, "\n%s", _( "Armour:" ) );
      l += scnprintf( &buf[l], sizeof( buf ) - l, "\n" );
      l +=
         scnprintf( &buf[l], sizeof( buf ) - l, _( "%.0f %s (%.1f %s)" ),
                    ship->armour, UNIT_ENERGY, ship->armour_regen, UNIT_POWER );
   }
   if ( ship->energy || ship->energy_regen ) {
      k += scnprintf( &lbl[k], sizeof( lbl ) - k, "\n%s", _( "Energy:" ) );
      l += scnprintf( &buf[l], sizeof( buf ) - l, "\n" );
      l +=
         scnprintf( &buf[l], sizeof( buf ) - l, _( "%.0f %s (%.1f %s)" ),
                    ship->energy, UNIT_ENERGY, ship->energy_regen, UNIT_POWER );
   }
   if ( ship->cap_cargo ) {
      char buf_cargo[ECON_MASS_STRLEN];
      tonnes2str( buf_cargo, ship->cap_cargo );
      k += scnprintf( &lbl[k], sizeof( lbl ) - k, "\n%s", _( "Cargo Space:" ) );
      l += scnprintf( &buf[l], sizeof( buf ) - l, "\n%s", buf_cargo );
   }
   if ( ship->fuel ) {
      k += scnprintf( &lbl[k], sizeof( lbl ) - k, "\n%s", _( "Fuel:" ) );
      l += scnprintf( &buf[l], sizeof( buf ) - l, "\n%d %s", ship->fuel,
                      UNIT_UNIT );
   }
   if ( ship->fuel_consumption != 100. ) {
      k += scnprintf( &lbl[k], sizeof( lbl ) - k, "\n%s", _( "Fuel Use:" ) );
      l += scnprintf( &buf[l], sizeof( buf ) - l, "\n%d %s",
                      ship->fuel_consumption, UNIT_UNIT );
   }
 
   k += scnprintf( &lbl[k], sizeof( lbl ) - k, "\n\n%s", _( "Price:" ) );
   l += scnprintf( &buf[l], sizeof( buf ) - l, "\n\n%s", buf_price );
   k += scnprintf( &lbl[k], sizeof( lbl ) - k, "\n%s", _( "Money:" ) );
   l += scnprintf( &buf[l], sizeof( buf ) - l, "\n%s", buf_credits );
   if ( ship->license ) {
      int meets_reqs = player_hasLicense( ship->license );
      ;
      k += scnprintf( &lbl[k], sizeof( lbl ) - k, "\n%s", _( "License:" ) );
      if ( blackmarket )
         l += scnprintf( &buf[l], sizeof( buf ) - l, "\n%s#0",
                         _( "Not Necessary (Blackmarket)" ) );
      else
         l += scnprintf( &buf[l], sizeof( buf ) - l, "\n%s%s#0",
                         meets_reqs ? "" : "#r", _( ship->license ) );
   }
   if ( ship->cond ) {
      int meets_reqs = 0;
      if ( land_spob != NULL )
         meets_reqs = cond_check( ship->cond );
      k += scnprintf( &lbl[k], sizeof( lbl ) - k, "\n%s", _( "Requires:" ) );
      if ( blackmarket )
         l += scnprintf( &buf[l], sizeof( buf ) - l, "\n%s#0",
                         _( "Not Necessary (Blackmarket)" ) );
      else
         l += scnprintf( &buf[l], sizeof( buf ) - l, "\n%s%s#0",
                         meets_reqs ? "" : "#r", _( ship->condstr ) );
   }
 
   /* Calculate layout. */
   window_dimWindow( wid, &w, &h );
   iw = 440 + ( w - LAND_WIDTH );
   sw = SHIP_GFX_SIZE;
   bh = LAND_BUTTON_HEIGHT;
   tw = gl_printWidthRaw( &gl_defFont, lbl );
   th = gl_printHeightRaw( &gl_defFont, tw, lbl ) + gl_defFont.h;
   y  = -35;
   window_modifyText( wid, "txtSDesc", lbl );
   window_resizeWidget( wid, "txtSDesc", tw + 20, th );
   window_moveWidget( wid, "txtSDesc", 20 + iw + 20, y );
   window_modifyText( wid, "txtDDesc", buf );
   window_resizeWidget( wid, "txtDDesc", w - sw - 40 - ( 20 + iw + 20 + 128 ),
                        th );
   window_moveWidget( wid, "txtDDesc", 20 + iw + 20 + tw + 20, y );
   y = MIN( y - th, -40 - SHIP_GFX_SIZE - 20 );
   if ( ship->desc_extra ) {
      scnprintf( &buf[0], sizeof( buf ), "%s\n%s", _( ship->description ),
                 _( ship->desc_extra ) );
      window_modifyText( wid, "txtDescription", buf );
   } else
      window_modifyText( wid, "txtDescription", _( ship->description ) );
   window_resizeWidget( wid, "txtDescription",
                        w - ( 20 + iw + 20 ) - ( sw + 40 ), y - 20 + h - bh );
   window_moveWidget( wid, "txtDescription", 20 + iw + 20, y );
 
   if ( !shipyard_canBuy( ship, land_spob ) )
      window_disableButtonSoft( wid, "btnBuyShip" );
   else
      window_enableButton( wid, "btnBuyShip" );
 
   if ( !shipyard_canTrade( ship, land_spob ) )
      window_disableButtonSoft( wid, "btnTradeShip" );
   else
      window_enableButton( wid, "btnTradeShip" );
}

void shipyard_cleanup( void )
{
   array_free( shipyard_list );
   shipyard_list     = NULL;
   shipyard_selected = NULL;
}
 
static int shipyard_naevpedia_hook( void *data )
{
   (void)data;
   naevpedia_open( "ships" );
   return 0;
}
static void shipyard_naevpedia( unsigned int wid, const char *str )
{
   (void)wid;
   (void)str;
   hook_addFunc( shipyard_naevpedia_hook, NULL, "safe" );
}

static void shipyard_rmouse( unsigned int wid, const char *widget_name )
{
   shipyard_buy( wid, widget_name );
}

static void shipyard_buy( unsigned int wid, const char *str )
{
   (void)str;
   int       i;
   char      buf[STRMAX_SHORT];
   Ship     *ship;
   HookParam hparam[2];
 
   i = toolkit_getImageArrayPos( wid, "iarShipyard" );
   if ( i < 0 || array_size( shipyard_list ) == 0 )
      return;
 
   ship = shipyard_list[i];
 
   credits_t targetprice = ship_buyPrice( ship );
 
   if ( !shipyard_canBuy( ship, land_spob ) ) {
      land_errDisplay();
      return;
   }
 
   credits2str( buf, targetprice, 2 );
   if ( dialogue_YesNo( _( "Are you sure?" ), /* confirm */
                        _( "Do you really want to spend %s on a new ship?" ),
                        buf ) == 0 )
      return;
 
   /* Player just got a new ship */
   snprintf( buf, sizeof( buf ), _( "Bought at %s in the %s system." ),
             spob_name( land_spob ), _( cur_system->name ) );
   if ( player_newShip( ship, NULL, 0, buf, 0 ) == NULL ) {
      /* Player actually aborted naming process. */
      return;
   }
   player_modCredits( -targetprice ); /* ouch, paying is hard */
 
   /* Update shipyard. */
   shipyard_update( wid, NULL );
 
   /* Run hook. */
   hparam[0].type   = HOOK_PARAM_SHIP;
   hparam[0].u.ship = ship;
   hparam[1].type   = HOOK_PARAM_SENTINEL;
   hooks_runParam( "ship_buy", hparam );
   land_needsTakeoff( 1 );
}
 
static int shipyard_canAcquire( const Ship *ship, const Spob *spob,
                                credits_t price )
{
   int failure = 0;
   int blackmarket =
      ( ( spob != NULL ) && spob_hasService( spob, SPOB_SERVICE_BLACKMARKET ) );
   land_errClear();
 
   /* Must have the necessary license. */
   if ( !blackmarket && !player_hasLicense( ship->license ) ) {
      land_errDialogueBuild( _( "You need the '%s' license to buy this ship." ),
                             _( ship->license ) );
      failure = 1;
   }
 
   /* Must meet conditional requirement. */
   if ( !blackmarket && ( ship->cond != NULL ) && !cond_check( ship->cond ) ) {
      land_errDialogueBuild( "%s", _( ship->condstr ) );
      failure = 1;
   }
 
   /* Must have enough credits. */
   if ( !player_hasCredits( price ) ) {
      char buf[ECON_CRED_STRLEN];
      credits2str( buf, price - player.p->credits, 2 );
      land_errDialogueBuild( _( "You need %s more." ), buf );
      failure = 1;
   }
   return !failure;
}

int shipyard_canBuy( const Ship *ship, const Spob *spob )
{
   credits_t price = ship_buyPrice( ship );
   return shipyard_canAcquire( ship, spob, price );
}

int shipyard_canTrade( const Ship *ship, const Spob *spob )
{
   credits_t price =
      ship_buyPrice( ship ) - player_shipPrice( player.p->name, 0 );
   land_errClear();
 
   if ( ship_isFlag( player.p->ship, SHIP_UNIQUE ) ) {
      land_errDialogueBuild( _( "You can not trade in unique ships!" ) );
      return 0;
   }
 
   if ( pilot_cargoUsedMission( player.p ) > 0 ) {
      land_errDialogueBuild(
         _( "You can not trade in your ship when you have mission cargo!" ) );
      return 0;
   }
   return shipyard_canAcquire( ship, spob, price );
}

static void shipyard_trade( unsigned int wid, const char *str )
{
   (void)str;
   int  i;
   char buf[STRMAX_SHORT], buf2[ECON_CRED_STRLEN], buf3[ECON_CRED_STRLEN],
      buf4[ECON_CRED_STRLEN];
   Ship *ship;
 
   i = toolkit_getImageArrayPos( wid, "iarShipyard" );
   if ( i < 0 || shipyard_list == NULL )
      return;
 
   ship = shipyard_list[i];
 
   credits_t targetprice = ship_buyPrice( ship );
   credits_t playerprice = player_shipPrice( player.p->name, 0 );
 
   if ( !shipyard_canTrade( ship, land_spob ) ) {
      land_errDisplay();
      return;
   }
 
   credits2str( buf, targetprice, 2 );
   credits2str( buf2, playerprice, 2 );
   credits2str( buf3, targetprice - playerprice, 2 );
   credits2str( buf4, playerprice - targetprice, 2 );
 
   /* Display the correct dialogue depending on the new ship's price versus the
    * player's. */
   if ( targetprice == playerprice ) {
      if ( dialogue_YesNo( _( "Are you sure?" ), /* confirm */
                           _( "Your %s is worth %s, exactly as much as the new "
                              "ship, so no credits need be exchanged. Are you "
                              "sure you want to trade your ship in?" ),
                           _( player.p->ship->name ), buf2 ) == 0 )
         return;
   } else if ( targetprice < playerprice ) {
      if ( dialogue_YesNo( _( "Are you sure?" ), /* confirm */
                           _( "Your %s is worth %s, more than the new ship. "
                              "For your ship, you will get the new %s and %s. "
                              "Are you sure you want to trade your ship in?" ),
                           _( player.p->ship->name ), buf2, _( ship->name ),
                           buf4 ) == 0 )
         return;
   } else if ( targetprice > playerprice ) {
      if ( dialogue_YesNo(
              _( "Are you sure?" ), /* confirm */
              _( "Your %s is worth %s, so the new ship will cost %s. Are you "
                 "sure you want to trade your ship in?" ),
              _( player.p->ship->name ), buf2, buf3 ) == 0 )
         return;
   }
 
   /* Store stuff. */
   const Ship *ssold = player.p->ship;
   char       *sname = strdup( player.p->name );
 
   /* player just got a new ship */
   snprintf( buf, sizeof( buf ), _( "Bought at %s in the %s system." ),
             spob_name( land_spob ), _( cur_system->name ) );
   if ( player_newShip( ship, NULL, 1, buf, 0 ) == NULL ) {
      free( sname );
      return; /* Player aborted the naming process. */
   }
 
   HookParam hparam[4];
   hparam[0].type   = HOOK_PARAM_SHIP;
   hparam[0].u.ship = ssold;
   hparam[1].type   = HOOK_PARAM_STRING;
   hparam[1].u.str  = sname;
   hparam[2].type   = HOOK_PARAM_BOOL;
   hparam[2].u.b    = 1;
   hparam[3].type   = HOOK_PARAM_SENTINEL;
   hooks_runParam( "ship_sell", hparam );
   hparam[0].type   = HOOK_PARAM_SHIP;
   hparam[0].u.ship = ship;
   hparam[1].type   = HOOK_PARAM_BOOL;
   hparam[1].u.b    = 1;
   hparam[2].type   = HOOK_PARAM_SENTINEL;
   hooks_runParam( "ship_buy", hparam );
 
   free( sname );
 
   player_modCredits(
      playerprice -
      targetprice ); /* Modify credits by the difference between ship values. */
 
   land_refuel();
 
   /* The newShip call will trigger a loadGUI that will recreate the land
    * windows. Therefore the land ID will be void. We must reload in in order to
    * properly update it again.*/
   wid = land_getWid( LAND_WINDOW_SHIPYARD );
 
   /* Update shipyard. */
   shipyard_update( wid, NULL );
}

static void shipyard_renderSlots( double bx, double by, double bw, double bh,
                                  void *data )
{
   (void)data;
   double y, w;
   Ship  *ship;
 
   /* Make sure a valid ship is selected. */
   ship = shipyard_selected;
   if ( ship == NULL )
      return;
 
   y = by + bh;
 
   /* Draw rotated text. */
   y -= 10 + 5;
   gl_print( &gl_smallFont, bx, y, &cFontWhite, _( "Slots:" ) );
 
   w = bw - 10.;
 
   /* Weapon slots. */
   y -= 20;
   shipyard_renderSlotsRow( bx, y, w, _( OUTFIT_LABEL_WEAPON ),
                            ship->outfit_weapon );
 
   /* Utility slots. */
   y -= 20;
   shipyard_renderSlotsRow( bx, y, w, _( OUTFIT_LABEL_UTILITY ),
                            ship->outfit_utility );
 
   /* Structure slots. */
   y -= 20;
   shipyard_renderSlotsRow( bx, y, w, _( OUTFIT_LABEL_STRUCTURE ),
                            ship->outfit_structure );
}

static void shipyard_renderSlotsRow( double bx, double by, double bw,
                                     const char *str, ShipOutfitSlot *s )
{
   (void)bw;
   double x;
 
   /* Print text. */
   gl_printMidRaw( &gl_smallFont, 40, bx, by, &cFontWhite, -1, str );
   x = bx + 30.;
 
   /* Draw squares. */
   for ( int i = 0; i < array_size( s ); i++ ) {
      const glColour  *c;
      const glTexture *icon;
      const int        size = 14;
 
      /* Ignore locked slots. */
      if ( s[i].locked && !s[i].visible && ( s[i].data == NULL ) )
         continue;
 
      /* Get the colour. */
      c = outfit_slotSizeColour( &s[i].slot );
      if ( c == NULL )
         c = &cBlack;
 
      x += size + 7.;
      toolkit_drawRect( x, by, size, size, c, NULL );
 
      /* Add colour stripe depending on required/exclusiveness. */
      if ( s[i].required )
         toolkit_drawTriangle( x, by, x + size, by + size, x, by + size,
                               &cBrightRed );
      else if ( s[i].exclusive )
         toolkit_drawTriangle( x, by, x + size, by + size, x, by + size,
                               &cWhite );
      else if ( s[i].slot.spid != 0 )
         toolkit_drawTriangle( x, by, x + size, by + size, x, by + size,
                               &cBlack );
 
      gl_renderRectEmpty( x, by, size, size, &cBlack );
 
      /* Draw icon if applicable. */
      icon = sp_icon( s[i].slot.spid );
      if ( icon != NULL ) {
         double sw = 12.;
         double sh = 12.;
         double sx = x + 6;
         double sy = by + 6;
         if ( icon->flags & OPENGL_TEX_SDF )
            gl_renderSDF( icon, sx, sy, sw, sh, &cWhite, 0., 1. );
         else
            gl_renderScaleAspect( icon, sx, sy, sw, sh, NULL );
      }
   }
}
 
static int shipyard_mouseSlots( unsigned int wid, const SDL_Event *event,
                                double mx, double my, double bw, double bh,
                                double rx, double ry, void *data )
{
   (void)wid;
   (void)bw;
   (void)rx;
   (void)ry;
   int                x   = floor( ( mx - 30. - 21. ) / 21. );
   int                y   = floor( ( bh - my - 15. ) / 20. );
   CstShipSlotWidget *wgt = (CstShipSlotWidget *)data;
   ShipOutfitSlot    *ps;
   Ship              *ship = shipyard_selected;
 
   /* Need a selected ship. */
   if ( ship == NULL )
      return 0;
 
   /* Only care about motion. */
   if ( event->type != SDL_MOUSEMOTION )
      return 0;
 
   /* Find what row. */
   switch ( y ) {
   case 0:
      ps = ship->outfit_weapon;
      break;
   case 1:
      ps = ship->outfit_utility;
      break;
   case 2:
      ps = ship->outfit_structure;
      break;
 
   default:
      wgt->mouseover = 0;
      return 0;
   }
   if ( ( x < 0 ) || ( x >= array_size( ps ) ) ) {
      wgt->mouseover = 0;
      return 0;
   }
 
   /* Mark the slot. */
   wgt->mouseover = 1;
   wgt->slot      = &ps[x];
   wgt->alty      = 30. + ( 2 - y ) * 20.;
   wgt->altx      = 15. + ( x + 2 ) * 21.;
   return 1;
}
 
static void shipyard_renderSlotsOver( double bx, double by, double bw,
                                      double bh, void *data )
{
   (void)bw;
   (void)bh;
   char                  alt[STRMAX_SHORT];
   int                   pos;
   CstShipSlotWidget    *wgt = (CstShipSlotWidget *)data;
   const ShipOutfitSlot *slot;
 
   if ( wgt->mouseover <= 0 )
      return;
 
   slot = wgt->slot;
   pos  = 0;
   if ( slot->slot.spid ) {
      pos = scnprintf( alt, sizeof( alt ), "#o%s\n",
                       _( sp_display( slot->slot.spid ) ) );
   } else
      pos = 0;
   pos += scnprintf( &alt[pos], sizeof( alt ) - pos, _( "#%c%s #%c%s #0slot" ),
                     outfit_slotSizeColourFont( &slot->slot ),
                     _( slotSize( slot->slot.size ) ),
                     outfit_slotTypeColourFont( &slot->slot ),
                     _( slotName( slot->slot.type ) ) );
 
   /* Draw the alt stuff. */
   toolkit_drawAltText( bx + wgt->altx, by + wgt->alty, alt );
}
 
static void preview_free( void *ptr )
{
   CstShipPreview *p = ptr;
   glDeleteFramebuffers( 1, &p->fbo );
   glDeleteTextures( 1, &p->tex );
   free( ptr );
}
 
static void preview_render( double x, double y, double w, double h, void *data )
{
   CstShipPreview *p = data;
 
   if ( shipyard_selected == NULL )
      return;
 
   if ( ship_gfxAnimated( shipyard_selected ) )
      ship_renderGfxStore( p->fbo, shipyard_selected, SHIP_GFX_SIZE, p->dir,
                           p->updown, 0. );
 
   gl_renderTextureRaw( p->tex, OPENGL_TEX_VFLIP, x, y, w, h, 0., 0., 1., 1.,
                        NULL, 0. );
}
 
static int preview_mouse( unsigned int wid, const SDL_Event *event, double mx,
                          double my, double w, double h, double rx, double ry,
                          void *data )
{
   (void)wid;
   CstShipPreview *p = data;
 
   if ( shipyard_selected == NULL )
      return 0;
 
   switch ( event->type ) {
   case SDL_MOUSEBUTTONUP:
      p->mousedown = 0;
      return 0;
 
   case SDL_MOUSEBUTTONDOWN:
      if ( ( mx < 0. ) || ( mx > w ) || ( my < 0. ) || ( my > h ) )
         return 0;
      p->mousedown = 1;
      return 1;
 
   case SDL_MOUSEMOTION:
      if ( !p->mousedown )
         return 0;
      p->dir += rx / ( SHIP_GFX_SIZE / M_PI * 0.5 );
      p->updown += ry / ( SHIP_GFX_SIZE / M_PI * 0.5 );
      /* Rerender if not animated. */
      if ( !ship_gfxAnimated( shipyard_selected ) )
         ship_renderGfxStore( p->fbo, shipyard_selected, SHIP_GFX_SIZE, p->dir,
                              p->updown, 0. );
      return 1;
 
   default:
      return 0;
   }
}
 
static void preview_focusLose( unsigned int wid, const char *wgtname )
{
   (void)wid;
   (void)wgtname;
}