TextureManager.cpp

#include "TextureManager.h"

//allocating & initializing texturemanager pointer. 
TextureManager* TextureManager::s_pInstance = 0;

bool TextureManager::load(std::string fileName, std::string id, SDL_Renderer* pRenderer)
{
	SDL_Surface* pTempSurface = IMG_Load(fileName.c_str());
	
	if(pTempSurface == 0)
	{
		return false;
	}

	SDL_Texture* pTexture = SDL_CreateTextureFromSurface(pRenderer, pTempSurface);

	SDL_FreeSurface(pTempSurface);

	//all good, add texture to our map.
	if(pTexture != 0)
	{
		m_textureMap[id] = pTexture; 
		return true;
	}

	return false;
}

void TextureManager::draw(std::string id, int x, int y, int width, int height, SDL_Renderer* pRenderer, SDL_RendererFlip flip)
{
	SDL_Rect srcRect;
	SDL_Rect destRect; 

	srcRect.x = 0; 
	srcRect.y = 0; 
	srcRect.w = destRect.w = width; 
	srcRect.h = destRect.h = height;
	destRect.x = x; 
	destRect.y = y; 

	SDL_RenderCopyEx(pRenderer, m_textureMap[id], &srcRect, &destRect, 0, 0, flip);
}

void TextureManager::drawFrame(std::string id, int x, int y, int width,  int height, int currentRow, int currentFrame, SDL_Renderer* pRenderer, SDL_RendererFlip flip)
{
	SDL_Rect srcRect;
	SDL_Rect destRect; 

	srcRect.x = currentFrame * width; 
	srcRect.y = height * (currentRow - 1);
	srcRect.w = destRect.w = width; 
	srcRect.h = destRect.h = height;
	destRect.x = x; 
	destRect.y = y;

	SDL_RenderCopyEx(pRenderer, m_textureMap[id], &srcRect, &destRect, 0,0,flip);
}

bool TextureManager::textureExists(const std::string& id)
{
	return m_textureMap.count(id) != 0;
}

void TextureManager::drawTile(std::string id, int margin, int spacing, int x, int y, int width, int height, int currentRow, int currentFrame, SDL_Renderer *pRenderer)
{
	SDL_Rect srcRect; 
	SDL_Rect destRect; 

	srcRect.x = margin + (spacing + width) * currentFrame;
	srcRect.y = margin + (spacing + height) * currentRow; 
	srcRect.w = destRect.w = width; 
	srcRect.h = destRect.h = height;

	destRect.x = x; 
	destRect.y = y; 

	SDL_RenderCopyEx(pRenderer, m_textureMap[id], &srcRect, &destRect, 0,0, SDL_FLIP_NONE);
}

TextureManager* TextureManager::instance()
{
	if(s_pInstance == 0)
	{
		s_pInstance = new TextureManager(); 
		return s_pInstance;
	}

	return s_pInstance;
}

void TextureManager::clearFromTextureMap(std::string id)
{
	m_textureMap.erase(id);
}