forked from sorgelig/Amstrad_MiST
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progressbar.v
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progressbar.v
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/*
A simple progressbar overlay
*/
module progressbar (
input clk,
input ce_pix,
input hblank,
input vblank,
input enable,
input [24:0] current,
input [24:0] max,
output pix
);
parameter X_OFFSET = 11'd68;
parameter Y_OFFSET = 11'd20;
reg [7:0] progress;
/*
always @(posedge clk) begin
progress <= current / max[24:7];
end
*/
// Without divider
reg [24:0] prg_counter = 0;
reg [7:0] prg_iter = 0;
always @(posedge clk) begin
if (prg_counter >= current) begin
progress <= prg_iter;
prg_counter <= 0;
prg_iter <= 0;
end else begin
prg_counter <= prg_counter + max[24:7];
prg_iter <= prg_iter + 1'd1;
end
end
// horizontal counter
reg [10:0] h_cnt;
// vertical counter
reg [10:0] v_cnt;
always @(posedge clk) begin
reg hbD;
if(ce_pix) begin
hbD <= hblank;
if(hblank) begin
h_cnt <= 0;
if (!hbD) v_cnt <= v_cnt + 1'd1;
end else
h_cnt <= h_cnt + 1'd1;
if(vblank) v_cnt <= 0;
end
end
// area in which OSD is being displayed
wire [10:0] h_osd_start = X_OFFSET;
wire [10:0] h_osd_end = h_osd_start + 8'd134;
wire [10:0] v_osd_start = Y_OFFSET;
wire [10:0] v_osd_end = v_osd_start + 8'd8;
wire [10:0] osd_hcnt = h_cnt - h_osd_start;
wire [3:0] osd_vcnt = v_cnt - v_osd_start;
reg osd_de;
reg osd_pixel;
always @(posedge clk) begin
if(ce_pix) begin
case (osd_vcnt)
0,7: osd_pixel <= 1;
2,3,4,5: osd_pixel <= osd_hcnt == 0 || osd_hcnt == 132 || ((osd_hcnt - 2'd2) < progress);
default: osd_pixel <= osd_hcnt == 0 || osd_hcnt == 132;
endcase
osd_de <=
(h_cnt >= h_osd_start) && ((h_cnt + 1'd1) < h_osd_end) &&
(v_cnt >= v_osd_start) && (v_cnt < v_osd_end);
end
end
assign pix = enable & osd_pixel & osd_de;
endmodule