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[/] [s80186/] [trunk/] [fpga/] [VGA/] [FontColorLUT.sv] - Rev 2
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// Copyright Jamie Iles, 2017
//
// This file is part of s80x86.
//
// s80x86 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.
//
// s80x86 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 s80x86. If not, see <http://www.gnu.org/licenses/>.
`ifndef FONT_ROM_PATH
`define FONT_ROM_PATH "."
`endif
module FontColorLUT(input logic clk,
input logic render_cursor,
input logic [7:0] glyph,
input logic [2:0] glyph_row,
input logic [2:0] glyph_col,
input logic [3:0] foreground,
input logic [3:0] background,
output logic [3:0] r,
output logic [3:0] g,
output logic [3:0] b);
// 64 bits per character, 256 characters
logic font_rom[16384];
initial $readmemb({{`FONT_ROM_PATH, "/font.bin"}}, font_rom);
logic font_bit;
wire [13:0] font_mem_addr = {glyph, glyph_row[2:0], glyph_col[2:0]};
wire [11:0] foreground_rgb;
wire [11:0] background_rgb;
reg [11:0] color_lut [0:15] = '{
12'h0_0_0, // black
12'h0_0_a, // blue
12'h0_a_0, // green
12'h0_a_a, // cyan
12'ha_0_0, // red
12'ha_0_a, // magenta
12'ha_5_0, // brown
12'ha_a_a, // white
12'h5_5_5, // gray
12'h5_5_f, // bright blue
12'h5_f_5, // bright green
12'h5_f_f, // bright cyan
12'hf_5_5, // bright red
12'hf_5_f, // bright magenta
12'hf_f_5, // yellow
12'hf_f_f // bright white
};
always_ff @(posedge clk) begin
foreground_rgb <= color_lut[foreground];
background_rgb <= color_lut[background];
end
assign {r, g, b} = font_bit ^ render_cursor ? foreground_rgb : background_rgb;
always_ff @(posedge clk)
font_bit <= font_rom[font_mem_addr];
endmodule