Subversion Repositories wf3d

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

// Project Monophony

//   Wire-Frame 3D Graphics Accelerator IP Core

//

// File:

//   fm_geo_viewport.v

//

// Abstract:

//   Viewport mapping

//    v->x = ((v->x)+1)*m_vp_width/2+m_vp_x;

//    v->y = ((v->y)+1)*m_vp_height/2+m_vp_y;

//

//    m_vp_x = 0, m_vp_y =0

//    v->x = ((v->x)+1)*m_vp_width/2

//    v->y = ((v->y)+1)*m_vp_height/2

//

//    this module calc except /2:

//    v->x = ((v->x)+1)*m_vp_width

//    v->y = ((v->y)+1)*m_vp_height

//

// Author:

//   Kenji Ishimaru (info.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_geo_viewport (

  input         clk_core,

  input         rst_x,

  output        o_state,

  // register configuration

  input [21:0]  i_vw,

  input [21:0]  i_vh,

  // vertex input

  input         i_en,

  output        o_ack,

  input  [5:0]  i_outcode,

  input  [21:0] i_vx,

  input  [21:0] i_vy,

  // vertex output

  output        o_en,

  input         i_ack,

  output [5:0]  o_outcode,

  output [21:0] o_vx,

  output [21:0] o_vy

);

localparam P_IDLE    = 'd0;

localparam P_Y_IN    = 'd1;

localparam P_WADD2   = 'd2;

localparam P_WMUL0   = 'd3;

localparam P_WMUL1   = 'd4;

localparam P_WMUL2   = 'd5;

localparam P_WMUL3   = 'd6;

localparam P_WAIT    = 'd7;

localparam P_DONE    = 'd8;

parameter P_1F              = 22'hf8000;

parameter P_SCREEN_WIDTH      = 22'h18a000;    // 640

parameter P_SCREEN_HEIGHT     = 22'h17f000;   // 480

parameter P_SCREEN_WIDTH_HALF = 22'h17a000;    // 640/2 = 320

parameter P_SCREEN_HEIGHT_HALF = 22'h16f000;   // 480 / 2 = 240

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

// regs 

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

reg [3:0]      r_state;

reg [21:0]     r_vx;

reg [21:0]     r_vy;

reg [5:0]      r_outcode;

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

// wire

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

wire [21:0] w_fadd_a;

wire [21:0] w_fadd_b;

wire [21:0] w_fadd_out;

wire [21:0] w_fmul_b;

wire [21:0] w_fmul_out;

wire        w_set_outcode;

wire        w_set_vx;

wire        w_set_vy;

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

// assign

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

assign o_state = (r_state == P_IDLE);

assign w_fadd_a = (r_state == P_IDLE) ? i_vx : i_vy;

assign w_fadd_b = P_1F;

assign w_fmul_b = (r_state == P_WMUL0) ? i_vw :

                                         i_vh ;

assign w_set_vx = (r_state == P_WMUL3);

assign w_set_vy = (r_state == P_WAIT);

assign o_vx = r_vx;

assign o_vy = r_vy;

assign o_en = (r_state == P_DONE);

assign o_ack = (r_state == P_IDLE);

assign w_set_outcode = (r_state == P_IDLE);

assign o_outcode = r_outcode;

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

// always

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

always @(posedge clk_core) begin

  if (w_set_outcode) r_outcode <= i_outcode;

  if (w_set_vx) r_vx <= w_fmul_out;

  if (w_set_vy) r_vy <= w_fmul_out;

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_state <= P_IDLE;

  end else begin

    case (r_state)

      P_IDLE: begin

       if (i_en) r_state <= P_Y_IN;

      end

      P_Y_IN: r_state <= P_WADD2;

      P_WADD2: r_state <= P_WMUL0;

      P_WMUL0: r_state <= P_WMUL1;

      P_WMUL1: r_state <= P_WMUL2;

      P_WMUL2: r_state <= P_WMUL3;

      P_WMUL3: r_state <= P_WAIT;

      P_WAIT:  r_state <= P_DONE;

      P_DONE: begin

       if (i_ack) r_state <= P_IDLE;

      end

    endcase

  end

end

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

// module instance

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

fm_3d_fadd u_fadd (

  .clk_core(clk_core),

  .i_en(1'b1),

  .i_adsb(1'b0),

  .i_a(w_fadd_a),

  .i_b(w_fadd_b),

  .o_c(w_fadd_out)

);

fm_3d_fmul u_fmul (

  .clk_core(clk_core),

  .i_en(1'b1),

  .i_a(w_fadd_out),

  .i_b(w_fmul_b),

  .o_c(w_fmul_out)

);

endmodule