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Passing a value into a bound class.

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Started by Fayte September 29, 2012 04:21 AM

21 comments, last by TechRogue 11 years, 6 months ago

Fayte

139

Author

September 29, 2012 04:21 AM

Ok here's the deal,

I have an Image class with a draw function like this:



void Img::Draw(SDL_Surface* surface) {

SDL_Rect offset;

offset.x = X;

offset.y = Y;

SDL_BlitSurface(imgSurface, NULL, surface, &offset);

}

I would like to be able to do this in the script:



Image img;



img.x = 0;

img.y = 0;



img.Draw();

But I need to pass the screen Surface to the draw function I don't want my scripters to have to do img.Draw(GetSurface()); I would like this to be handled through the C++ backend code is there a way that everytime img.Draw() is called in script I can pass the SDL_Surface into the C++ method?

If you need this explained better ask away its 12 A.M. here

might not have explained it the best.

saejox

714

September 29, 2012 10:43 AM

how about you also have this draw function



void Img::Draw() {

Draw(GetSurface());

}

Fayte

139

Author

September 29, 2012 12:06 PM

how about you also have this draw function

void Img::Draw() { Draw(GetSurface()); }

Well I thought that at first too, but the thing is GetSurface(); is in my engine class which has an instance that would need to be passed but I don't know if I can pass the instance into the Image class every time a new one is created in Angelscript. Sorry rather new to Angelscript

saejox

714

September 29, 2012 01:30 PM

first divide your problem to small problems.

can you do this in your script now?



Image img;

img.x = 0;

img.y = 0;

if not please read this section of the manual
http://www.angelcode.com/angelscript/sdk/docs/manual/doc_register_api_topic.html

Fayte

139

Author

September 29, 2012 01:33 PM

first divide your problem to small problems.

can you do this in your script now?

Image img; img.x = 0; img.y = 0;

if not please read this section of the manual
http://www.angelcode..._api_topic.html

Yesir

got that far.

saejox

714

September 29, 2012 02:12 PM

then i just dont understand why you cant create a second function in you Img class.

class Img
{
void Img::Draw(SDL_Surface* surface)
{
SDL_Rect offset;
offset.x = X;
offset.y = Y;
SDL_BlitSurface(imgSurface, NULL, surface, &offset);
}

void Img::Draw()
{
Draw(GetSurface());
}
}

register Img::Draw() to script.
like this



r = engine->RegisterObjectMethod("Image", "void Draw()", asMETHODPR(Image, Draw, (void), void), asCALL_THISCALL);

surely you have access to GetSurface() function in C++. ( or engine->GetSurface() )

Fayte

139

Author

September 29, 2012 05:25 PM

then i just dont understand why you cant create a second function in you Img class.

class Img
{
void Img::Draw(SDL_Surface* surface)
{
SDL_Rect offset;
offset.x = X;
offset.y = Y;
SDL_BlitSurface(imgSurface, NULL, surface, &offset);
}

void Img::Draw()
{
Draw(GetSurface());
}
}

register Img::Draw() to script.
like this
r = engine->RegisterObjectMethod("Image", "void Draw()", asMETHODPR(Image, Draw, (void), void), asCALL_THISCALL);

surely you have access to GetSurface() function in C++. ( or engine->GetSurface() )

You are quite right but I cant pass my engine variable into a c++ class that's not instanced yet can I? Sorry for being newbish like I said I'm new to angelscript. But I don't know how to pass in GetSurface() into my Img class. Without first saying Image img = new Image(engine); on my C++ side.

saejox

714

September 29, 2012 07:18 PM

your problem is pretty much a c++ pointer ownership issue.

So what is this mystical "engine" class would you show me?

TechRogue

722

September 29, 2012 07:39 PM

Here's how I give my classes access to the main engine class:

When I set up the script engine, I pass the address of my engine class instance in as userdata (a void pointer):



engine = asCreateScriptEngine(ANGELSCRIPT_VERSION);

engine->SetUserData(&myGameEngine);

Then, in my class constructors that need a pointer to the engine (to access window drawing, content management, etc.), I do this:



asIScriptContext* context = NULL;

asIScriptEngine* engine = NULL;

context = asGetActiveContext(); // Get the currently executing angelscript context

if ((context = asGetActiveContext()) != NULL && (engine = context->GetEngine()) != NULL)

{

	// owner is a member pointer to the engine

	owner = reinterpret_cast<Engine*>(engine->GetUserData());

}

Hopefully that helps.

Fayte

139

Author

September 29, 2012 09:19 PM

Here's how I give my classes access to the main engine class:

When I set up the script engine, I pass the address of my engine class instance in as userdata (a void pointer):

engine = asCreateScriptEngine(ANGELSCRIPT_VERSION); engine->SetUserData(&myGameEngine);

Then, in my class constructors that need a pointer to the engine (to access window drawing, content management, etc.), I do this:

asIScriptContext* context = NULL; asIScriptEngine* engine = NULL; context = asGetActiveContext(); // Get the currently executing angelscript context if ((context = asGetActiveContext()) != NULL && (engine = context->GetEngine()) != NULL) { // owner is a member pointer to the engine owner = reinterpret_cast<Engine*>(engine->GetUserData()); }

Hopefully that helps.

Gonna try that but here is my engine class



#include "Engine.h"

#include <windows.h> // For the WaitMessage() function.

#include "Scripting/ScriptManager.h"

using namespace Ogre;

/** Default constructor. **/

AffinityEngine::AffinityEngine() {

m_lLastTick   = 0;

m_iWidth   = 1024;

m_iHeight   = 768;

m_czTitle   = 0;

m_pScreen   = 0;

m_iFPSTickCounter = 0;

m_iFPSCounter  = 0;

m_iCurrentFPS  = 0;

m_bMinimized  = false;

}

/** Destructor. **/

AffinityEngine::~AffinityEngine() {

SDL_Quit();

}

/** Sets the height and width of the window.

@param iWidth The width of the window

@param iHeight The height of the window

**/

void AffinityEngine::SetSize(const int& iWidth, const int& iHeight) {

m_iWidth  = iWidth;

m_iHeight = iHeight;

if(m_vmVideoMode == VideoMode_3D) {

  m_pScreen = SDL_SetVideoMode( iWidth, iHeight, 0, SDL_OPENGL );

} else if(m_vmVideoMode == VideoMode_2D) {

  m_pScreen = SDL_SetVideoMode( iWidth, iHeight, 0, SDL_SWSURFACE );

}

}

/** Initialize SDL, the window and the additional data. **/

void AffinityEngine::Init(VideoMode videoMode) {

printf("Engine Initialing.\n");

// Register SDL_Quit to be called at exit; makes sure things are cleaned up when we quit.

atexit( SDL_Quit );

// Initialize SDL's subsystems - in this case, only video.

if ( SDL_Init( SDL_INIT_VIDEO ) < 0 )  {

  fprintf( stderr, "Unable to init SDL: %s\n", SDL_GetError() );

  exit( 1 );

}

SetTitle("Affinity Engine");

m_vmVideoMode = videoMode;

// Attempt to create a window with the specified height and width.

SetSize(m_iWidth, m_iHeight);

if(videoMode == VideoMode_3D){

  m_rRoot = new Root("plugins_d.cfg", "ogre.cfg", "AffinityEngine.log");

  m_rRoot->restoreConfig();

  m_rRoot->initialise(false);

  NameValuePairList misc;

  #ifdef _WIN32

	SDL_SysWMinfo wmInfo;

	SDL_VERSION(&wmInfo.version);

	SDL_GetWMInfo(&wmInfo);



	size_t winHandle = reinterpret_cast<size_t>(wmInfo.window);

	size_t winGlContext = reinterpret_cast<size_t>(wmInfo.hglrc);



	misc["externalWindowHandle"] = StringConverter::toString(winHandle);

	misc["externalGLContext"] = StringConverter::toString(winGlContext);

   #else

	misc["currentGLContext"] = String("True");

   #endif

	  m_rwRenderWindow = m_rRoot->createRenderWindow("MainRenderWindow", 1024, 768, false, &misc);

   m_rwRenderWindow->setVisible(true);

   printf("Initialized 3D Rendering.\n");

} else {

  printf("Initialized 2D Rendering.\n");

}

// If we fail, return error.

if ( m_pScreen == NULL ) {

  fprintf( stderr, "Unable to set up video: %s\n", SDL_GetError() );

  exit( 1 );

}

printf("Engine Initialized.\n");

AdditionalInit();

}

/** The main loop. **/

void AffinityEngine::Start() {

printf("Engine Started\n");

m_lLastTick = SDL_GetTicks();

m_bQuit = false;

m_smScriptManager = new ScriptManager("../Data/Scripts", this);

m_smScriptManager->Init();

// Main loop: loop forever.

while ( !m_bQuit ) {

  // Handle mouse and keyboard input

  HandleInput();

  if ( m_bMinimized ) {

   // Release some system resources if the app. is minimized.

   WaitMessage(); // pause the application until focus in regained

  } else {

   // Do some thinking

   DoLogic();

   // Render stuff

   DoRender();

  }

}

End();

}

/** Handles all controller inputs.

@remark This function is called once per frame.

**/

void AffinityEngine::HandleInput() {

// Poll for events, and handle the ones we care about.

SDL_Event event;

while ( SDL_PollEvent(&event) ) {

  switch (event.type) {

  case SDL_KEYDOWN:

   // If escape is pressed set the Quit-flag

   /*if (event.key.keysym.sym == SDLK_ESCAPE){

	m_bQuit = true;

	break;

   }*/

   m_smScriptManager->e_imInputMgr->InjectKeyboard(event.key.keysym.sym, InputState::Down);

   KeyDown(event.key.keysym.sym);

   break;

  case SDL_KEYUP:

   m_smScriptManager->e_imInputMgr->InjectKeyboard(event.key.keysym.sym, InputState::Up);

   KeyUp(event.key.keysym.sym);

   break;

  case SDL_QUIT:

   m_bQuit = true;

   break;

  case SDL_MOUSEMOTION:

   m_smScriptManager->e_imInputMgr->InjectMouse(event.motion.x, event.motion.y, event.button.button);

   MouseMoved(event.button.button, event.motion.x, event.motion.y, event.motion.xrel, event.motion.yrel);

   break;

  case SDL_MOUSEBUTTONUP:

   m_smScriptManager->e_imInputMgr->InjectMouse(event.motion.x, event.motion.y, event.button.button);

   MouseButtonUp(event.button.button, event.motion.x, event.motion.y, event.motion.xrel, event.motion.yrel);

   break;

  case SDL_MOUSEBUTTONDOWN:

   m_smScriptManager->e_imInputMgr->InjectMouse(event.motion.x, event.motion.y, event.button.button);

   MouseButtonDown(event.button.button, event.motion.x, event.motion.y, event.motion.xrel, event.motion.yrel);

   break;

  case SDL_ACTIVEEVENT:

   if ( event.active.state & SDL_APPACTIVE ) {

	if ( event.active.gain ) {

	 m_bMinimized = false;

	 WindowActive();

	} else {

	 m_bMinimized = true;

	 WindowInactive();

	}

   }

   break;

  } // switch

} // while (handling input)

}

/** Handles the updating routine. **/

void AffinityEngine::DoLogic() {

long iElapsedTicks = SDL_GetTicks() - m_lLastTick;

m_lLastTick = SDL_GetTicks();

m_smScriptManager->ParseScripts();

Logic( iElapsedTicks );

m_smScriptManager->Update();

m_iFPSTickCounter += iElapsedTicks;

}

/** Handles the rendering and FPS calculations. **/

void AffinityEngine::DoRender() {

++m_iFPSCounter;

if ( m_iFPSTickCounter >= 1000 ) {

  m_iCurrentFPS = m_iFPSCounter;

  m_iFPSCounter = 0;

  m_iFPSTickCounter = 0;

}

if(m_vmVideoMode == VideoMode_2D) {

  SDL_FillRect( m_pScreen, 0, SDL_MapRGB( m_pScreen->format, 0, 0, 0 ) );

  // Lock surface if needed

  if ( SDL_MUSTLOCK( m_pScreen ) )

   if ( SDL_LockSurface( m_pScreen ) < 0 )

	return;

  Render( GetSurface() );

  m_smScriptManager->Draw();

  // Unlock if needed

  if ( SDL_MUSTLOCK( m_pScreen ) )

   SDL_UnlockSurface( m_pScreen );

  // Tell SDL to update the whole gScreen

  SDL_Flip( m_pScreen );

}else{

  m_rRoot->renderOneFrame();

  SDL_GL_SwapBuffers();

}

}

/** Sets the title of the window

@param czTitle A character array that contains the text that the window title should be set to.

**/

void AffinityEngine::SetTitle(std::string czTitle) {

m_czTitle = czTitle.c_str();

SDL_WM_SetCaption( czTitle.c_str(), 0 );

}

/** Retrieve the title of the application window.

@return The last set windows title as a character array.

@remark Only the last set title is returned. If another application has changed the window title, then that title won't be returned.

**/

const char* AffinityEngine::GetTitle() {

return m_czTitle;

}

/** Retrieve the main screen surface.

@return A pointer to the SDL_Surface surface

@remark The surface is not validated internally.

**/

SDL_Surface* AffinityEngine::GetSurface() {

return m_pScreen;

}

/** Get the current FPS.

@return The number of drawn frames in the last second.

@remark The FPS is only updated once each second.

**/

int AffinityEngine::GetFPS() {

return m_iCurrentFPS;

}

void AffinityEngine::Shutdown() {

m_bQuit = true;

}

ScriptManager* AffinityEngine::GetScriptManager() {

return m_smScriptManager;

}

Ok while making those changes I got this error:

Engine Initialing.

Initialized 2D Rendering.

Engine Initialized.

Engine Started

(0, 0) : ERR  : Failed in call to function 'RegisterObjectBehaviour' with 'Imag

e' and 'ref@ f()' (Code: -10)

from this line



r = e_seScriptEngine->RegisterObjectBehaviour("Image", asBEHAVE_FACTORY, "ref@ f()", asFUNCTION(Img_Factory), asCALL_CDECL); assert(r >= 0);

and here is the function:



static Img* Img_Factory() {

return new Img();

}

Passing a value into a bound class.

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