go-board-code/vga_image_renderer_top.v

module VGAImageRenderer_Top(
  input i_Clk,

  output o_VGA_HSync,
  output o_VGA_VSync,
  output o_VGA_Red_0,
  output o_VGA_Red_1,
  output o_VGA_Red_2,
  output o_VGA_Grn_0,
  output o_VGA_Grn_1,
  output o_VGA_Grn_2,
  output o_VGA_Blu_0,
  output o_VGA_Blu_1,
  output o_VGA_Blu_2
);
  localparam TOTAL_COLUMNS = 800;
  localparam TOTAL_ROWS = 525;

  localparam ACTIVE_COLUMNS = 640;
  localparam ACTIVE_ROWS = 480;

  localparam VIDEO_WIDTH = 3;

  wire w_HSync_FromPulseGenerator, w_VSync_FromPulseGenerator;
  wire w_HSync_FromImageRenderer, w_VSync_FromImageRenderer;
  wire w_HSync_FromPorchSync, w_VSync_FromPorchSync;

  wire [2:0] w_Red_FromImageRenderer, w_Green_FromImageRenderer, w_Blue_FromImageRenderer;
  wire [2:0] w_Red_FromPorchSync, w_Green_FromPorchSync, w_Blue_FromPorchSync;

  VGA_Sync_Pulse_Generator #(
    .TOTAL_COLUMNS(TOTAL_COLUMNS),
    .TOTAL_ROWS(TOTAL_ROWS),
    .ACTIVE_COLUMNS(ACTIVE_COLUMNS),
    .ACTIVE_ROWS(ACTIVE_ROWS)
  ) pulseGenerator (
    .i_Clk(i_Clk),

    .o_HSync(w_HSync_FromPulseGenerator),
    .o_VSync(w_VSync_FromPulseGenerator),

    .o_rawX(),
    .o_rawX()
  );

  VGAImageRenderer imageRenderer (
    .i_Clk(i_Clk),

    .i_HSync(w_HSync_FromPulseGenerator),
    .i_VSync(w_VSync_FromPulseGenerator),

    .o_HSync(w_HSync_FromImageRenderer),
    .o_VSync(w_VSync_FromImageRenderer),
    .o_Red(w_Red_FromImageRenderer),
    .o_Green(w_Green_FromImageRenderer),
    .o_Blue(w_Blue_FromImageRenderer)
  );

  wire w_HSync_FromImageDimmer, w_VSync_FromImageDimmer;
  wire [2:0] w_Red_FromImageDimmer, w_Green_FromImageDimmer, w_Blue_FromImageDimmer;

  ImageMovingSpotlight imageDimmer (
    .i_Clk(i_Clk),

    .i_HSync(w_HSync_FromImageRenderer),
    .i_VSync(w_VSync_FromImageRenderer),
    .i_Red(w_Red_FromImageRenderer),
    .i_Green(w_Green_FromImageRenderer),
    .i_Blue(w_Blue_FromImageRenderer),

    .o_HSync(w_HSync_FromImageDimmer),
    .o_VSync(w_VSync_FromImageDimmer),
    .o_Red(w_Red_FromImageDimmer),
    .o_Green(w_Green_FromImageDimmer),
    .o_Blue(w_Blue_FromImageDimmer)
  );

  VGA_Add_Porches_To_Output #(
    .VIDEO_WIDTH(VIDEO_WIDTH),
    .TOTAL_COLUMNS(TOTAL_COLUMNS),
    .TOTAL_ROWS(TOTAL_ROWS),
    .ACTIVE_COLUMNS(ACTIVE_COLUMNS),
    .ACTIVE_ROWS(ACTIVE_ROWS)
  ) PorchOutput (
    .i_Clk(i_Clk),

    .i_HSync(w_HSync_FromImageDimmer),
    .i_VSync(w_VSync_FromImageDimmer),
    .i_Red(w_Red_FromImageDimmer),
    .i_Green(w_Green_FromImageDimmer),
    .i_Blue(w_Blue_FromImageDimmer),

    .o_HSync(w_HSync_FromPorchSync),
    .o_VSync(w_VSync_FromPorchSync),
    .o_Red(w_Red_FromPorchSync),
    .o_Green(w_Green_FromPorchSync),
    .o_Blue(w_Blue_FromPorchSync)
  );

  assign o_VGA_HSync = w_HSync_FromPorchSync;
  assign o_VGA_VSync = w_VSync_FromPorchSync;

  assign o_VGA_Red_0 = w_Red_FromPorchSync[0];
  assign o_VGA_Red_1 = w_Red_FromPorchSync[1];
  assign o_VGA_Red_2 = w_Red_FromPorchSync[2];

  assign o_VGA_Grn_0 = w_Green_FromPorchSync[0];
  assign o_VGA_Grn_1 = w_Green_FromPorchSync[1];
  assign o_VGA_Grn_2 = w_Green_FromPorchSync[2];

  assign o_VGA_Blu_0 = w_Blue_FromPorchSync[0];
  assign o_VGA_Blu_1 = w_Blue_FromPorchSync[1];
  assign o_VGA_Blu_2 = w_Blue_FromPorchSync[2];
endmodule

module ImageMovingSpotlight(
  input i_Clk,
  input i_HSync,
  input i_VSync,
  input [2:0] i_Red,
  input [2:0] i_Green,
  input [2:0] i_Blue,

  output reg o_HSync,
  output reg o_VSync,
  output reg [2:0] o_Red,
  output reg [2:0] o_Green,
  output reg [2:0] o_Blue
);
  parameter VIDEO_WIDTH = 3;
  parameter TOTAL_COLUMNS = 800;
  parameter TOTAL_ROWS = 525;

  wire w_HSync, w_VSync;

  wire [$clog2(TOTAL_COLUMNS)-1:0] w_X;
  wire [$clog2(TOTAL_ROWS)-1:0] w_Y;
  reg [$clog2(12500000)-1:0] r_counter = 0;

  reg [VIDEO_WIDTH-1:0] r_Red = 0;
  reg [VIDEO_WIDTH-1:0] r_Green = 0;
  reg [VIDEO_WIDTH-1:0] r_Blue = 0;

  reg [$clog2(TOTAL_COLUMNS)-1:0] r_currentX = 4;
  reg [$clog2(TOTAL_ROWS)-1:0] r_currentY = 3;

  VGA_Current_Beam_Position #(
    .TOTAL_COLUMNS(TOTAL_COLUMNS),
    .TOTAL_ROWS(TOTAL_ROWS)
  ) CurrentPosition (
    .i_Clk(i_Clk),
    .i_HSync(i_HSync),
    .i_VSync(i_VSync),
    .o_HSync(w_HSync),
    .o_VSync(w_VSync),
    .o_X(w_X),
    .o_Y(w_Y)
  );

  wire [6:0] w_CellX;
  wire [5:0] w_CellY;

  assign w_CellX = w_X[9:3];
  assign w_CellY = w_Y[9:3];

  always @(posedge i_Clk) begin
    if (r_counter == 25000000/16) begin
      r_counter <= 0;

      if (r_currentX == 80 - 1) begin
        r_currentX <= 0;
      end else begin
        r_currentX <= r_currentX + 1;
      end
    end else begin
      r_counter <= r_counter + 1;
    end
  end

  always @(posedge i_Clk) begin
    o_HSync <= w_HSync;
    o_VSync <= w_VSync;

    // if the pointer is right on the square, white
    // if the pointer is within a square, brighten by {[0, 1], 1}
    // otherwise return the current red

    o_Red <= r_Red;
    o_Green <= r_Green;
    o_Blue <= r_Blue;

    r_Red <= (r_currentX == w_CellX && r_currentY == w_CellY) ? 7 : i_Red;
    r_Green <= (r_currentX == w_CellX && r_currentY == w_CellY) ? 7 : i_Green;
    r_Blue <= (r_currentX == w_CellX && r_currentY == w_CellY) ? 7 : i_Blue;
      /*
      (r_currentX > 0 && w_X == r_currentX - 1 && r_currentY == w_Y) ? {i_Red[0:1], 1} :
      (r_currentX < TOTAL_COLUMNS - 2 && w_X == r_currentX + 1 && r_currentY == w_Y) ? {i_Red[0:1], 1} :
      (r_currentY > 0 && w_Y == r_currentY - 1 && r_currentX == w_X) ? {i_Red[0:1], 1} :
      (r_currentY < TOTAL_ROWS - 2 && w_Y == r_currentY + 1 && r_currentX == w_X) ? {i_Red[0:1], 1} : i_Red;
    */
  end
endmodule