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//=======================================================================

// Project Monophony

//   Wire-Frame 3D Graphics Accelerator IP Core

//

// File:

//   fm_sys.v

//

// Abstract:

//   System register module

//

// Author:

//   Kenji Ishimaru (info.wf3d@gmail.com)

//

//======================================================================

//

// Copyright (c) 2015, Kenji Ishimaru

// All rights reserved.

//

// Redistribution and use in source and binary forms, with or without

// modification, are permitted provided that the following conditions are met:

//

//  -Redistributions of source code must retain the above copyright notice,

//   this list of conditions and the following disclaimer.

//  -Redistributions in binary form must reproduce the above copyright notice,

//   this list of conditions and the following disclaimer in the documentation

//   and/or other materials provided with the distribution.

//

// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"

// AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,

// THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR

// PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR

// CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,

// EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,

// PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;

// OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,

// WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR

// OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,

// EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

//

// Revision History

`include "fm_3d_define.v"

module fm_sys (

  input         clk_core,

  input         rst_x,

  output        o_int,

  // internal interface

`ifdef D3D_WISHBONE

  input         i_wb_stb,

  input         i_wb_we,

  input  [7:2]  i_wb_adr,

  output        o_wb_ack,

  input  [3:0]  i_wb_sel,

  input  [31:0] i_wb_dat,

  output [31:0] o_wb_dat,

`else

  input         i_req,

  input         i_wr,

  input [7:0]   i_adrs,

  output        o_ack,

  input [3:0]   i_be,

  input [31:0]  i_wd,

  output        o_rstr,

  output [31:0] o_rd,

`endif

  // Geometry Engine Configurations

  //   vertex fetch

  output        o_dma_start,

  output [29:0] o_dma_top_address,  // bit[31:2]

  output [15:0] o_dma_size,

  input         i_geo_state,

  //   matrix elements  

`ifdef D3D_USE_MATRIX_PALETTE

  output [22*`D3D_NUM_OF_MATS-1:0] o_m00,

  output [22*`D3D_NUM_OF_MATS-1:0] o_m01,

  output [22*`D3D_NUM_OF_MATS-1:0] o_m02,

  output [22*`D3D_NUM_OF_MATS-1:0] o_m03,

  output [22*`D3D_NUM_OF_MATS-1:0] o_m10,

  output [22*`D3D_NUM_OF_MATS-1:0] o_m11,

  output [22*`D3D_NUM_OF_MATS-1:0] o_m12,

  output [22*`D3D_NUM_OF_MATS-1:0] o_m13,

  output [22*`D3D_NUM_OF_MATS-1:0] o_m20,

  output [22*`D3D_NUM_OF_MATS-1:0] o_m21,

  output [22*`D3D_NUM_OF_MATS-1:0] o_m22,

  output [22*`D3D_NUM_OF_MATS-1:0] o_m23,

  output [22*`D3D_NUM_OF_MATS-1:0] o_m30,

  output [22*`D3D_NUM_OF_MATS-1:0] o_m31,

  output [22*`D3D_NUM_OF_MATS-1:0] o_m32,

  output [22*`D3D_NUM_OF_MATS-1:0] o_m33,

  output [1:0] o_num_mats,

`else

  output [21:0] o_m00,

  output [21:0] o_m01,

  output [21:0] o_m02,

  output [21:0] o_m03,

  output [21:0] o_m10,

  output [21:0] o_m11,

  output [21:0] o_m12,

  output [21:0] o_m13,

  output [21:0] o_m20,

  output [21:0] o_m21,

  output [21:0] o_m22,

  output [21:0] o_m23,

  output [21:0] o_m30,

  output [21:0] o_m31,

  output [21:0] o_m32,

  output [21:0] o_m33,

`endif

  // curring

  output o_en_cull,

  output o_ccw,

  // viewport mapping

  output [21:0] o_vw,

  output [21:0] o_vh,

  // Rasterizer Configurations

  output [15:0] o_scr_w_m1,

  output [15:0] o_scr_h_m1,

  output [15:0] o_scr_w,

  output [29:0]  o_pixel_top_address,  // bit[31:2]

  output [7:0]  o_pixel_color,

  output        o_y_flip,

  input         i_ras_state,

  input         i_debug

);

//////////////////////////////////

// regs 

//////////////////////////////////

  // Geometry Engine Configurations

  //   vertex fetch

  reg           r_dma_start;

  reg [29:0]    r_dma_top_address;

  reg [15:0]    r_dma_size;

`ifdef D3D_USE_MATRIX_PALETTE

  reg [1:0]     r_num_mats;

  reg [1:0]     r_mat_bank;

  reg [21:0]    r_m00[`D3D_NUM_OF_MATS-1:0];

  reg [21:0]    r_m01[`D3D_NUM_OF_MATS-1:0];

  reg [21:0]    r_m02[`D3D_NUM_OF_MATS-1:0];

  reg [21:0]    r_m03[`D3D_NUM_OF_MATS-1:0];

  reg [21:0]    r_m10[`D3D_NUM_OF_MATS-1:0];

  reg [21:0]    r_m11[`D3D_NUM_OF_MATS-1:0];

  reg [21:0]    r_m12[`D3D_NUM_OF_MATS-1:0];

  reg [21:0]    r_m13[`D3D_NUM_OF_MATS-1:0];

  reg [21:0]    r_m20[`D3D_NUM_OF_MATS-1:0];

  reg [21:0]    r_m21[`D3D_NUM_OF_MATS-1:0];

  reg [21:0]    r_m22[`D3D_NUM_OF_MATS-1:0];

  reg [21:0]    r_m23[`D3D_NUM_OF_MATS-1:0];

  reg [21:0]    r_m30[`D3D_NUM_OF_MATS-1:0];

  reg [21:0]    r_m31[`D3D_NUM_OF_MATS-1:0];

  reg [21:0]    r_m32[`D3D_NUM_OF_MATS-1:0];

  reg [21:0]    r_m33[`D3D_NUM_OF_MATS-1:0];

`else

  reg [21:0]    r_m00;

  reg [21:0]    r_m01;

  reg [21:0]    r_m02;

  reg [21:0]    r_m03;

  reg [21:0]    r_m10;

  reg [21:0]    r_m11;

  reg [21:0]    r_m12;

  reg [21:0]    r_m13;

  reg [21:0]    r_m20;

  reg [21:0]    r_m21;

  reg [21:0]    r_m22;

  reg [21:0]    r_m23;

  reg [21:0]    r_m30;

  reg [21:0]    r_m31;

  reg [21:0]    r_m32;

  reg [21:0]    r_m33;

`endif

  // curring

  reg           r_en_cull;

  reg           r_ccw;

  // viewport mapping

  reg [21:0]    r_vw;

  reg [21:0]    r_vh;

  // Rasterizer Configurations

  reg [15:0]    r_scr_w_m1;

  reg [15:0]    r_scr_h_m1;

  reg [15:0]    r_scr_w;

  reg [29:0]    r_pixel_top_address;

  reg [7:0]     r_pixel_color;

  reg           r_y_flip;

  reg           r_rstr;

  reg [31:0]    r_rd;

  reg           r_int;

  reg           r_int_mask;

  reg           r_int_out;

//////////////////////////////////

// wire

//////////////////////////////////

  wire [21:0]    w_f22;

  wire           w_hit0;

  wire           w_hit1;

  wire           w_hit2;

  wire           w_hit3;

  wire           w_hit4;

  wire           w_hit5;

  wire           w_hit6;

  wire           w_hit7;

  wire           w_hit8;

  wire           w_hit9;

  wire           w_hitA;

  wire           w_hitB;

  wire           w_hitC;

  wire           w_hitD;

  wire           w_hitE;

  wire           w_hitF;

  wire           w_hit10;

  wire           w_hit11;

  wire           w_hit12;

  wire           w_hit13;

  wire           w_hit14;

  wire           w_hit15;

  wire           w_hit16;

  wire           w_hit17;

  wire           w_hit18;

  wire           w_hit19;

  wire           w_hit1A;

  wire           w_hit1B;

  wire           w_hit1C;

  wire           w_hit1D;

  wire           w_hit0_w;

  wire           w_hit1_w;

  wire           w_hit2_w;

  wire           w_hit3_w;

  wire           w_hit4_w;

  wire           w_hit5_w;

  wire           w_hit6_w;

  wire           w_hit7_w;

  wire           w_hit8_w;

  wire           w_hit9_w;

  wire           w_hitA_w;

  wire           w_hitB_w;

  wire           w_hitC_w;

  wire           w_hitD_w;

  wire           w_hitE_w;

  wire           w_hitF_w;

  wire           w_hit10_w;

  wire           w_hit11_w;

  wire           w_hit12_w;

  wire           w_hit13_w;

  wire           w_hit14_w;

  wire           w_hit15_w;

  wire           w_hit16_w;

  wire           w_hit17_w;

  wire           w_hit18_w;

  wire           w_hit19_w;

  wire           w_hit1A_w;

  wire           w_hit1B_w;

  wire           w_hit1C_w;

  wire           w_hit1D_w;

  wire   [31:0]  w_rd;

  wire           w_rstr;

  wire           w_int_clear;

  wire           w_int_set;

//////////////////////////////////

// assign

//////////////////////////////////

  wire         w_req;

  wire         w_wr;

  wire [7:0]   w_adrs;

  wire [3:0]   w_be;

  wire [31:0]  w_wd;

`ifdef D3D_WISHBONE

assign w_req = i_wb_stb;

assign w_wr = i_wb_we;

assign w_adrs = {i_wb_adr,2'b0};

assign w_be = i_wb_sel;

assign w_wd = i_wb_dat;

`else

assign w_req = i_req;

assign w_wr = i_wr;

assign w_adrs = i_adrs;

assign w_be = i_be;

assign w_wd = i_wd;

`endif

assign w_hit0 = (w_adrs[6:2] == 5'h00);  // 0

assign w_hit1 = (w_adrs[6:2] == 5'h01);  // 4

assign w_hit2 = (w_adrs[6:2] == 5'h02);  // 8

assign w_hit3 = (w_adrs[6:2] == 5'h03);  // c

assign w_hit4 = (w_adrs[6:2] == 5'h04);  // 10

assign w_hit5 = (w_adrs[6:2] == 5'h05);  // 14

assign w_hit6 = (w_adrs[6:2] == 5'h06);  // 18

assign w_hit7 = (w_adrs[6:2] == 5'h07);  // 1c

assign w_hit8 = (w_adrs[6:2] == 5'h08);  // 20

assign w_hit9 = (w_adrs[6:2] == 5'h09);  // 24

assign w_hitA = (w_adrs[6:2] == 5'h0a);  // 28

assign w_hitB = (w_adrs[6:2] == 5'h0b);  // 2c

assign w_hitC = (w_adrs[6:2] == 5'h0c);  // 30

assign w_hitD = (w_adrs[6:2] == 5'h0d);  // 34

assign w_hitE = (w_adrs[6:2] == 5'h0e);  // 38

assign w_hitF = (w_adrs[6:2] == 5'h0f);  // 3c

assign w_hit10 = (w_adrs[6:2] == 5'h10);  // 40

assign w_hit11 = (w_adrs[6:2] == 5'h11);  // 44

assign w_hit12 = (w_adrs[6:2] == 5'h12);  // 48

assign w_hit13 = (w_adrs[6:2] == 5'h13);  // 4c

assign w_hit14 = (w_adrs[6:2] == 5'h14);  // 50

assign w_hit15 = (w_adrs[6:2] == 5'h15);  // 54

assign w_hit16 = (w_adrs[6:2] == 5'h16);  // 58

assign w_hit17 = (w_adrs[6:2] == 5'h17);  // 5c

assign w_hit18 = (w_adrs[6:2] == 5'h18);  // 60

assign w_hit19 = (w_adrs[6:2] == 5'h19);  // 64

assign w_hit1A = (w_adrs[6:2] == 5'h1A);  // 68

assign w_hit1B = (w_adrs[6:2] == 5'h1B);  // 6c

assign w_hit1C = (w_adrs[6:2] == 5'h1C);  // 70

assign w_hit1D = (w_adrs[6:2] == 5'h1D);  // 74

assign w_hit0_w = w_hit0 & w_wr & w_req;

assign w_hit1_w = w_hit1 & w_wr & w_req;

assign w_hit2_w = w_hit2 & w_wr & w_req;

assign w_hit3_w = w_hit3 & w_wr & w_req;

assign w_hit4_w = w_hit4 & w_wr & w_req;

assign w_hit5_w = w_hit5 & w_wr & w_req;

assign w_hit6_w = w_hit6 & w_wr & w_req;

assign w_hit7_w = w_hit7 & w_wr & w_req;

assign w_hit8_w = w_hit8 & w_wr & w_req;

assign w_hit9_w = w_hit9 & w_wr & w_req;

assign w_hitA_w = w_hitA & w_wr & w_req;

assign w_hitB_w = w_hitB & w_wr & w_req;

assign w_hitC_w = w_hitC & w_wr & w_req;

assign w_hitD_w = w_hitD & w_wr & w_req;

assign w_hitE_w = w_hitE & w_wr & w_req;

assign w_hitF_w = w_hitF & w_wr & w_req;

assign w_hit10_w = w_hit10 & w_wr & w_req;

assign w_hit11_w = w_hit11 & w_wr & w_req;

assign w_hit12_w = w_hit12 & w_wr & w_req;

assign w_hit13_w = w_hit13 & w_wr & w_req;

assign w_hit14_w = w_hit14 & w_wr & w_req;

assign w_hit15_w = w_hit15 & w_wr & w_req;

assign w_hit16_w = w_hit16 & w_wr & w_req;

assign w_hit17_w = w_hit17 & w_wr & w_req;

assign w_hit18_w = w_hit18 & w_wr & w_req;

assign w_hit19_w = w_hit19 & w_wr & w_req;

assign w_hit1A_w = w_hit1A & w_wr & w_req;

assign w_hit1B_w = w_hit1B & w_wr & w_req;

assign w_hit1C_w = w_hit1C & w_wr & w_req;

assign w_hit1D_w = w_hit1D & w_wr & w_req;

assign w_rstr = w_req & !w_wr;

assign w_rd = (w_hit0) ? {8'h0,7'b0,r_ccw,7'b0,r_en_cull,7'b0,r_dma_start} :

              (w_hit1) ? {23'h0,r_int_mask,7'h0,r_int} :

              (w_hit2) ? {r_dma_top_address,2'b0} :

              (w_hit3) ? {16'h0,r_dma_size} :

 `ifdef D3D_USE_MATRIX_PALETTE

              (w_hit4) ? {10'h0,r_m00[r_mat_bank]} :

              (w_hit5) ? {10'h0,r_m01[r_mat_bank]} :

              (w_hit6) ? {10'h0,r_m02[r_mat_bank]} :

              (w_hit7) ? {10'h0,r_m03[r_mat_bank]} :

              (w_hit8) ? {10'h0,r_m10[r_mat_bank]} :

              (w_hit9) ? {10'h0,r_m11[r_mat_bank]} :

              (w_hitA) ? {10'h0,r_m12[r_mat_bank]} :

              (w_hitB) ? {10'h0,r_m13[r_mat_bank]} :

              (w_hitC) ? {10'h0,r_m20[r_mat_bank]} :

              (w_hitD) ? {10'h0,r_m21[r_mat_bank]} :

              (w_hitE) ? {10'h0,r_m22[r_mat_bank]} :

              (w_hitF) ? {10'h0,r_m23[r_mat_bank]} :

              (w_hit10) ? {10'h0,r_m30[r_mat_bank]} :

              (w_hit11) ? {10'h0,r_m31[r_mat_bank]} :

              (w_hit12) ? {10'h0,r_m32[r_mat_bank]} :

              (w_hit13) ? {10'h0,r_m33[r_mat_bank]} :

`else

              (w_hit4) ? {10'h0,r_m00} :

              (w_hit5) ? {10'h0,r_m01} :

              (w_hit6) ? {10'h0,r_m02} :

              (w_hit7) ? {10'h0,r_m03} :

              (w_hit8) ? {10'h0,r_m10} :

              (w_hit9) ? {10'h0,r_m11} :

              (w_hitA) ? {10'h0,r_m12} :

              (w_hitB) ? {10'h0,r_m13} :

              (w_hitC) ? {10'h0,r_m20} :

              (w_hitD) ? {10'h0,r_m21} :

              (w_hitE) ? {10'h0,r_m22} :

              (w_hitF) ? {10'h0,r_m23} :

              (w_hit10) ? {10'h0,r_m30} :

              (w_hit11) ? {10'h0,r_m31} :

              (w_hit12) ? {10'h0,r_m32} :

              (w_hit13) ? {10'h0,r_m33} :

`endif

              (w_hit14) ? {10'h0,r_vw} :

              (w_hit15) ? {10'h0,r_vh} :

              (w_hit16) ? {16'h0,r_scr_w_m1}:

              (w_hit17) ? {16'h0,r_scr_h_m1}:

              (w_hit18) ? {16'h0,r_scr_w}:

              (w_hit19) ? {r_pixel_top_address,2'b0} :

              (w_hit1A) ? {24'h0,7'h0,r_y_flip,r_pixel_color} :

`ifdef D3D_USE_MATRIX_PALETTE

              (w_hit1B) ? {16'h0,6'b0,r_num_mats,6'b0,r_mat_bank} :

`endif

                          32'h0;

`ifdef D3D_WISHBONE

assign o_wb_dat = r_rd;

assign o_wb_ack = (w_wr) ? w_req : r_rstr;

`else

assign o_rstr  = r_rstr;

assign o_rd = r_rd;

assign o_ack = i_req;

`endif

assign o_dma_start = r_dma_start;

assign o_dma_top_address = r_dma_top_address;

assign o_dma_size = r_dma_size;

`ifdef D3D_USE_MATRIX_PALETTE

assign o_num_mats = r_num_mats;

genvar gi;

  generate for (gi=0;gi<`D3D_NUM_OF_MATS;gi=gi+1) begin : gen_mat

    assign o_m00[22*(gi+1)-1:gi*22] = r_m00[gi];

    assign o_m01[22*(gi+1)-1:gi*22] = r_m01[gi];

    assign o_m02[22*(gi+1)-1:gi*22] = r_m02[gi];

    assign o_m03[22*(gi+1)-1:gi*22] = r_m03[gi];

    assign o_m10[22*(gi+1)-1:gi*22] = r_m10[gi];

    assign o_m11[22*(gi+1)-1:gi*22] = r_m11[gi];

    assign o_m12[22*(gi+1)-1:gi*22] = r_m12[gi];

    assign o_m13[22*(gi+1)-1:gi*22] = r_m13[gi];

    assign o_m20[22*(gi+1)-1:gi*22] = r_m20[gi];

    assign o_m21[22*(gi+1)-1:gi*22] = r_m21[gi];

    assign o_m22[22*(gi+1)-1:gi*22] = r_m22[gi];

    assign o_m23[22*(gi+1)-1:gi*22] = r_m23[gi];

    assign o_m30[22*(gi+1)-1:gi*22] = r_m30[gi];

    assign o_m31[22*(gi+1)-1:gi*22] = r_m31[gi];

    assign o_m32[22*(gi+1)-1:gi*22] = r_m32[gi];

    assign o_m33[22*(gi+1)-1:gi*22] = r_m33[gi];

  end

  endgenerate

`else

assign o_m00 = r_m00;

assign o_m01 = r_m01;

assign o_m02 = r_m02;

assign o_m03 = r_m03;

assign o_m10 = r_m10;

assign o_m11 = r_m11;

assign o_m12 = r_m12;

assign o_m13 = r_m13;

assign o_m20 = r_m20;

assign o_m21 = r_m21;

assign o_m22 = r_m22;

assign o_m23 = r_m23;

assign o_m30 = r_m30;

assign o_m31 = r_m31;

assign o_m32 = r_m32;

assign o_m33 = r_m33;

`endif

assign o_en_cull = r_en_cull;

assign o_ccw = r_ccw;

assign o_vw = r_vw;

assign o_vh = r_vh;

assign o_scr_w_m1 = r_scr_w_m1;

assign o_scr_h_m1 = r_scr_h_m1;

assign o_scr_w = r_scr_w;

assign o_y_flip = r_y_flip;

assign o_pixel_color = r_pixel_color;

assign o_pixel_top_address = r_pixel_top_address;

assign o_int = r_int_out;

assign w_int_clear = w_hit1_w;

assign w_int_set = i_geo_state & i_ras_state & r_dma_start;

//////////////////////////////////

// always

//////////////////////////////////

`ifdef D3D_SYNC_RESET

always @(posedge clk_core) begin

`else

always @(posedge clk_core or negedge rst_x) begin

`endif

  if (rst_x == `D3D_RESET_POL) begin

    r_int_out <= 1'b0;

  end else begin

    r_int_out <= r_int & ~r_int_mask;

  end

end

`ifdef D3D_SYNC_RESET

always @(posedge clk_core) begin

`else

always @(posedge clk_core or negedge rst_x) begin

`endif

  if (rst_x == `D3D_RESET_POL) begin

    r_int <= 1'b0;

  end else begin

    if (w_int_clear) r_int <= 1'b0;

    else if (w_int_set) r_int <= 1'b1;

  end

end

`ifdef D3D_SYNC_RESET

always @(posedge clk_core) begin

`else

always @(posedge clk_core or negedge rst_x) begin

`endif

  if (rst_x == `D3D_RESET_POL) begin

   r_rstr <= 1'b0;

  end else begin

   r_rstr <= w_rstr;

  end

end

always @(posedge clk_core) begin

  r_rd <= w_rd;

end

`ifdef D3D_SYNC_RESET

always @(posedge clk_core) begin

`else

always @(posedge clk_core or negedge rst_x) begin

`endif

  if (rst_x == `D3D_RESET_POL) begin

    r_dma_start <= 1'b0;

    r_en_cull <= 1'b1;

    r_ccw <= 1'b1;

  end else begin

    if (w_hit0_w) begin

      if (w_be[0]) r_dma_start   <= w_wd[0];

      if (w_be[1]) r_en_cull  <= w_wd[8];

      if (w_be[2]) r_ccw  <= w_wd[16];

    end else begin

      if (w_int_set) r_dma_start   <= 1'b0;

    end

  end

end

`ifdef D3D_SYNC_RESET

always @(posedge clk_core) begin

`else

always @(posedge clk_core or negedge rst_x) begin

`endif