boot_credits.cpp

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//            Copyright (C) 2004-2007 by The Allacrost Project
//                         All Rights Reserved
//
// This code is licensed under the GNU GPL version 2. It is free software 
// and you may modify it and/or redistribute it under the terms of this license.
// See http://www.gnu.org/copyleft/gpl.html for details.

#include "video.h"
#include "script.h"

#include "boot_credits.h"

using namespace std;

using namespace hoa_utils;
using namespace hoa_video;
using namespace hoa_script;

namespace hoa_boot {

CreditsScreen::CreditsScreen() :
  _visible(false),
  _text_offset_y(0.0f),
  _credits_rendered(NULL)
{
  // Init the background window
  _window.Create(1024.0f, 600.0f);
  _window.SetPosition(0.0f, 630.0f);
  _window.SetDisplayMode(VIDEO_MENU_EXPAND_FROM_CENTER);
  _window.Hide();

  // Load the credits from the Lua file
  ReadScriptDescriptor credits_file;
  if (credits_file.OpenFile("dat/credits.lua") == false) {
    cerr << "BOOT ERROR: failed to open the credits file" << endl;
    exit(1);
  }
  _credits_text = credits_file.ReadString("credits_text");
  credits_file.CloseFile();
}


CreditsScreen::~CreditsScreen()
{
  _window.Destroy();
  if (_credits_rendered != NULL) {
    delete(_credits_rendered);
    _credits_rendered = NULL;
  }
}


// Draws the credits window on the screen if it is set visible
void CreditsScreen::Draw()
{
  // Draw the background window
  _window.Draw();
  if (_window.GetState() != VIDEO_MENU_STATE_SHOWN) // Don't draw any text until the window is ready for drawing
    return;

  // Set clip region for the text and draw the visible part of it
  VideoManager->Move(512.0f, 450 + _text_offset_y);
  VideoManager->SetScissorRect(_window.GetScissorRect());
  VideoManager->EnableScissoring(true);
  if (_credits_rendered)
  {
    // Fade in the text by setting new color with alpha value below 1.0f
    float color_alpha = _text_offset_y * 0.025f;
    if (color_alpha > 1.0f)
      color_alpha = 1.0f;
    GLfloat modulation[] = {1.0f, 1.0f, 1.0f, color_alpha};
    glColor4fv(modulation);
    _credits_rendered->Draw();
  }
  VideoManager->EnableScissoring(false);
}


// Updates the credits window
void CreditsScreen::UpdateWindow(int32 frameTime)
{
  _window.Update(frameTime);
  float delta = static_cast<float>(frameTime) * 0.02f;
  _text_offset_y += delta; // Update text offset
}


// Shows the credits window
void CreditsScreen::Show()
{
  _window.Show();
  _visible = true;
  _text_offset_y = 0.0f; // Reset the text offset
  VideoManager->SetFont("default"); // Reset font
  VideoManager->SetTextColor(Color::white); // Reset text color

  if (!_credits_rendered) {
    _credits_rendered = VideoManager->RenderText(MakeUnicodeString(_credits_text));
    if (!_credits_rendered) {
      cerr << "BOOT ERROR: failed to render the credits string.\n" << endl;
      exit(1);
    }
  }
}


// Hides the credits window
void CreditsScreen::Hide()
{
  _window.Hide();
  _visible = false;
  glColor4fv(&Color::white[0]);
  if (_credits_rendered) {
    delete(_credits_rendered);
    _credits_rendered = NULL;
  }
}


// Returns true if the credits window is set visible at the moment
bool CreditsScreen::IsVisible()
{
  return _visible;
}


} // end hoa_boot

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