File size: 1,212 Bytes
a7407e6 | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 | // Composite-like horizontal blending by Kitrinx
module cofi (
input clk,
input pix_ce,
input enable,
input hblank,
input vblank,
input hs,
input vs,
input [7:0] red,
input [7:0] green,
input [7:0] blue,
output reg hblank_out,
output reg vblank_out,
output reg hs_out,
output reg vs_out,
output reg [7:0] red_out,
output reg [7:0] green_out,
output reg [7:0] blue_out
);
function bit [7:0] color_blend (
input [7:0] color_prev,
input [7:0] color_curr,
input blank_last
);
var
reg [8:0] sum;
begin
sum = color_curr;
if(!blank_last) sum = sum + color_prev;
color_blend = sum[8:1];
end
endfunction
reg [7:0] red_last;
reg [7:0] green_last;
reg [7:0] blue_last;
always @(posedge clk) if (pix_ce) begin
hblank_out <= hblank;
vblank_out <= vblank;
vs_out <= vs;
hs_out <= hs;
red_last <= red;
blue_last <= blue;
green_last <= green;
red_out <= enable ? color_blend(red_last, red, hblank_out) : red;
blue_out <= enable ? color_blend(blue_last, blue, hblank_out) : blue;
green_out <= enable ? color_blend(green_last, green, hblank_out) : green;
end
endmodule
|