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-- Author : Julian Andres Guarin Reyes.

-- Project : JART, Just Another Ray Tracer.

-- email : jguarin2002 at gmail.com, j.guarin at javeriana.edu.co

-- This code was entirely written by Julian Andres Guarin Reyes.

-- The following code is licensed under GNU Public License

-- http://www.gnu.org/licenses/gpl-3.0.txt.

 -- This file is part of JART (Just Another Ray Tracer).

    -- JART (Just Another Ray Tracer) is free software: you can redistribute it and/or modify

    -- it under the terms of the GNU General Public License as published by

    -- the Free Software Foundation, either version 3 of the License, or

    -- (at your option) any later version.

    -- JART (Just Another Ray Tracer) is distributed in the hope that it will be useful,

    -- but WITHOUT ANY WARRANTY; without even the implied warranty of

    -- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

    -- GNU General Public License for more details.

    -- You should have received a copy of the GNU General Public License

    -- along with JART (Just Another Ray Tracer).  If not, see <http://www.gnu.org/licenses/>.

-- 16X50M Intersection Tests    

library ieee;

use ieee.std_logic_1164.all;

package powerGrid is

        --A one stage pipe a+b+c with w width bits in input as well as output.

        component p1ax

                generic (       W               : integer := 36 );

                port    (       clk             :        in std_logic;

                                        rst             :        in std_logic;

                                        enable          :        in std_logic;

                                        dataa           :        in std_logic_vector(W-1 downto 0);

                                        datab           :        in std_logic_vector(W-1 downto 0);

                                        datac           :        in std_logic_vector(W-1 downto 0);

                                        result          :        out std_logic_vector(W-1 downto 0)

                );

        end component;

        -- A 1 stage pipe 18x18 multiplier. On Cycle III devices is a M-R (Multiplier, Register). (Should be generated using a synthesis tool....).

        component p1m18

                port    (

                                aclr            : in std_logic ;

                                clken           : in std_logic ;

                                clock           : in std_logic ;

                                dataa           : in std_logic_vector (17 downto 0);

                                datab           : in std_logic_vector (17 downto 0);

                                result          : out std_logic_vector (35 downto 0)

                );

        end component;

        -- Signed "less than"

        component sl32

                port    (

                                        dataa   : in std_logic_vector (31 downto 0);

                                        datab   : in std_logic_vector (31 downto 0);

                                        AlB             : out std_logic

                );

                end component;

        -- Signed "greater than"

        component sge32

                port    (

                                        dataa   : in std_logic_vector (31 downto 0);

                                        datab   : in std_logic_vector (31 downto 0);

                                        AgeB    : out std_logic

                );

                end component;

        -- Minimun distance Comparison

        component dComparisonCell

                generic (       W               : integer := 32;        -- V.D, minDistance and selectD Width 

                                        idColW  : integer := 2;         -- Column Sphere ID width. 1 = 2 columns max, 2= 4 colums max... and so on.

                                        idCol   : integer := 0           -- Column Id

                );

                port    (

                                clk             : in std_logic;

                                rst             : in std_logic;

                                cIdd    : in    std_logic_vector (idColW - 1 downto 0);  -- This is the reference column identification input.

                                cIdq    : out   std_logic_vector (idColW - 1 downto 0);  -- This is the result column identification output.

                                refvd   : in    std_logic_vector (W - 1 downto 0);               -- This is the reference projection incoming from the previous cell.

                                colvd   : in    std_logic_vector (W - 1 downto 0);               -- This is the sphere position over the ray traced vector projection.

                                selvd   : out   std_logic_vector (W - 1 downto 0)                -- This is the smallest value between refvd and colvd.

                );

        end component;

        -- Dot Product Calculation Cell. 

        -- A 4 side cell along with an upper side. 

        -- V input flows through V output using a data flipflop, so turning V output in the next cell on the next row V Input. V input also flows upwards into the dotproduct 3 stage pipeline. 

        -- D input flows through D output using a data flipflop, so turning D output in the next column cell. D input also flows upwards into the dotproduct 3 stage. 

        component dotCell

                generic (       levelW  : integer := 18;        -- Actual Level Width

                                        nLevelW : integer := 32);       -- Next Level Width

                port    (

                                clk                     : in std_logic;

                                rst                     : in std_logic;

                                -- Object control.

                                nxtSphere       : in std_logic; -- This bit controls when the sphere center goes to the next row.

                                nxtRay          : in std_logic; -- This bit controls when the ray goes to the next column.

                                -- First Side.

                                vxInput         : in std_logic_vector(levelW-1 downto 0);

                                vyInput         : in std_logic_vector(levelW-1 downto 0);

                                vzInput         : in std_logic_vector(levelW-1 downto 0);

                                -- Second Side (Opposite to the first one)

                                vxOutput        : out std_logic_vector(levelW-1 downto 0);

                                vyOutput        : out std_logic_vector(levelW-1 downto 0);

                                vzOutput        : out std_logic_vector(levelW-1 downto 0);

                                -- Third Side (Perpendicular to the first and second ones)

                                dxInput         : in std_logic_vector(levelW-1 downto 0);

                                dyInput         : in std_logic_vector(levelW-1 downto 0);

                                dzInput         : in std_logic_vector(levelW-1 downto 0);

                                --Fourth Side (Opposite to the third one)

                                dxOutput        : in std_logic_vector(levelW-1 downto 0);

                                dyOutput        : in std_logic_vector(levelW-1 downto 0);

                                dzOutput        : in std_logic_vector(levelW-1 downto 0);

                                --Fifth Side (Going to the floor right upstairs!)

                                vdOutput        : out std_logic_vector(nLevelW-1 downto 0) -- Dot product.

                );

        end component;

        -- K discriminant comparison.

        component kComparisonCell

                generic (       W               : integer := 32;

                                );

                port    (

                                        clk                     : in std_logic;

                                        rst                     : in std_logic;

                                        nxtRow  : in std_logic; -- Controls when the sphere goes to the next Row. 

                                        vdinput : in std_logic_vector (W-1 downto 0);

                                        kinput  : in std_logic_vector (W-1 downto 0);

                                        koutput : out std_logic_vector (W-1 downto 0);

                                        vdoutput: out std_logic_vector (W-1 downto 0) -- Selected dot product.                                   

                );

        end component;

end powerGrid;