P2 Magazine - Improve This - December Issue

BatchCatalogue.cpp

#include "BatchCatalogue.h"

using namespace icnh::gf ;

const bool BatchCatalogue::isMatch (const BatchableObject* object, const bool checkOnly) 
{
	if (!object) 
	{
		return false ;
	}

	_debug ("check to see if the geometry and shaders match") ;
	if (m_format == object->getDataFormat () && m_static == object->isStatic () && 
		m_vShader == object->getVertexShader () && m_fShader == object->getFragmentShader () && 
		m_indicies == object->hasIndicies ())
	{
		if (checkOnly) 
		{
			return true;
		}

		_debug ("check to see if the texture matches an existing support texture") ;
		const size_t numTexures = m_textures.size () ;
		for (size_t i = 0; i < numTexures; i++) 
		{
			SupportedTexture* catalogueItemTexture = m_textures[i] ;

			_debug ("we only check the first texture slot here, this is by design as batchable geometry only uses the fist texture as a distinguishing one") ;
			if (object->getTextureID (0) == catalogueItemTexture->getTextureID ()) 
			{
				catalogueItemTexture->incrementTextureUsage () ;
				return true ;
			}
		}

		_debug ("supported texture not found, attempt to add a new texture to the atlas") ;
		if (m_textureUnit[0]) 
		{
			if (!m_textureUnit[0]->willFit (object->getTextureID (0))) 
			{
				_debug ("our texture won't fit, return false as the object is no longer a match") ;
				return false ;
			}

			if (object->getDataFormat () & BufferedBatch::kFormatUsesTextureUnit0) 
			{
				m_textureUnit[0]->addTexture (object->getTextureID (0)) ;
			}
			if (object->getDataFormat () & BufferedBatch::kFormatUsesTextureUnit1) 
			{
				if (m_textureUnit[1]) 
				{
					m_textureUnit[1]->addTexture (object->getTextureID (1)) ;
				}
			}
			if (object->getDataFormat () & BufferedBatch::kFormatUsesTextureUnit2) 
			{
				if (m_textureUnit[2]) 
				{
					m_textureUnit[2]->addTexture (object->getTextureID (2)) ;
				}
			}
			if (object->getDataFormat () & BufferedBatch::kFormatUsesTextureUnit3) 
			{
				if (m_textureUnit[3]) 
				{
					m_textureUnit[3]->addTexture (object->getTextureID (3)) ;
				}
			}
		} 

		_debug ("add our texture to our batch-catalogue support list") ;
		SupportedTexture* texture = new SupportedTexture (object->getTextureID (0), TextureManager::getTextureWidth (object->getTextureID (0)), TextureManager::getTextureHeight (object->getTextureID (0))) ;

		if (texture) 
		{
			m_textures.push_back (texture) ;
		}

		return true ;
	}

	_debug ("object does not meet the batch catalogue requirements") ;
	return false ;
}