Method DoPrepare

trinity/Tr2TextureAtlas.cpp:131–178

This gets called when atlas textures are preparing themselves

// This gets called when atlas textures are preparing themselves
bool Tr2TextureAtlas::DoPrepare( Tr2AtlasTexture* tex )
{
	CCP_STATS_ZONE( __FUNCTION__ );

	USE_MAIN_THREAD_RENDER_CONTEXT();

	unsigned int width = tex->m_loadedBitmap->GetWidth();
	unsigned int height = tex->m_loadedBitmap->GetHeight();
	const unsigned areaWidth = width + m_margin * 2;
	const unsigned areaHeight = height + m_margin * 2;

	// Large textures are not good for atlassing, end up with a lot of small outsiders
	if( areaWidth * areaHeight > m_maxTextureArea )
	{
		return false;
	}

	Tr2TextureAtlasArea* area = GetFreeArea( areaWidth, areaHeight );

	if( !area )
	{
		// There isn't room in the atlas for this texture. This isn't an error per se,
		// we'll fall back to creating it as a standalone texture.
		return false;
	}

	area->type = Tr2TextureAtlasArea::IN_USE;
	area->tex = tex;
	tex->m_atlasArea = area;

	tex->m_x = area->rect.left + m_margin;
	tex->m_y = area->rect.top + m_margin;
	tex->m_width = width;
	tex->m_height = height;
	tex->m_textureWidth = m_width;
	tex->m_textureHeight = m_height;

	Tr2ImageIOHelpers::CopyToTexture( *tex->m_loadedBitmap, m_texture, area->rect.left, area->rect.top, m_margin, renderContext );

	if( m_hasMipMaps )
	{
		m_dirtyMipRegions.push_back( area->rect );
	}

	RegisterInsider( tex );

	return true;
}

// Register an atlas texture that lives inside the atlas
void Tr2TextureAtlas::RegisterInsider( Tr2AtlasTexture* tex )