Triangle

void Triangle::DrawFillMode(Surface* a_Target)
	{
		// Backface culling

		unsigned int t_Width = a_Target->GetWidth();
		unsigned int t_Height = a_Target->GetHeight();

		int t_FirstLine = SCRHEIGHT;

		for(int i = 0; i<SCRHEIGHT; i++)
		{
			t_Lowest[i] = SCRWIDTH;
			t_Highest[i] = 0.0f;
		}

		Pixel * t_Buffer = a_Target->GetBuffer();
		for ( int k = 0; k < 3; k++ )
		{
			float x1 = m_Vertex[k]->GetScreenX(),
			      y1 = m_Vertex[k]->GetScreenY(),
				  x2 = m_Vertex[(k + 1) % 3]->GetScreenX(),
				  y2 = m_Vertex[(k + 1) % 3]->GetScreenY();

			float b = x2 - x1;
			float h = y2 - y1;
			float l = fabsf( b );
			if (fabsf ( h ) > l) l = fabsf( h );
			int il = (int)l;
			float dx = b / (float)l;
			float dy = h / (float)l;
			for ( int i = 0; i <= il; i++ )
			{
				int t_Y = (int)y1;
				if(t_Y<t_Height && t_Y>=0)
				{
					if(x1>t_Highest[t_Y]) t_Highest[t_Y] = x1;
					if(x1<t_Lowest[t_Y]) t_Lowest[t_Y] = x1;


					if((t_Lowest[t_Y]!=SCRWIDTH || t_Highest[t_Y]!=0) && t_Y<t_FirstLine)
						t_FirstLine = t_Y;
				}

				if(x1>=0 && x1<t_Width && y1>=0 && y1<t_Height)
				{
					*(t_Buffer + (int)x1 + (int)y1 * t_Width) = 0xAAAAAA;
				}
				x1 += dx, y1 += dy;
			}
		}

		for(int y = t_FirstLine; y<SCRHEIGHT; y++)
		{
			for(int i = t_Lowest[y]; i<t_Highest[y] && i<SCRWIDTH; i++)
			{
				if(i>=0 && i<=t_Width && y>=0 && y<t_Height)
				{
					if(*(t_Buffer + (int)i + (int)y * t_Width)==0)
					{
						*(t_Buffer + (int)i + (int)y * t_Width) = 0xffffff;
					}
				}
			}
		}
	}