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|
`include "gfx/gfx_defs.sv"
module gfx_frag_funnel
(
input logic clk,
rst_n,
input frag_xy_lanes fragments,
input paint_lanes in_valid,
output logic in_ready,
input logic out_ready,
output logic out_valid,
output frag_xy frag
);
logic skid_ready, stall, ready, valid;
frag_xy next_frag, out;
paint_lanes current, next;
frag_xy_lanes fragments_hold;
assign ready = !(|next);
assign in_ready = skid_ready && ready;
gfx_skid_buf #(.WIDTH($bits(frag))) skid
(
.in(out),
.out(frag),
.*
);
gfx_skid_flow skid_flow
(
.in_ready(skid_ready),
.in_valid(valid),
.*
);
always_comb begin
next = 0;
next_frag = {($bits(next_frag)){1'bx}};
for (integer i = 0; i < `GFX_FINE_LANES; ++i)
if (current[i]) begin
next = current;
next[i] = 0;
next_frag = fragments_hold[i];
end
end
always_ff @(posedge clk or negedge rst_n)
if (!rst_n) begin
valid <= 0;
current <= 0;
end else if (!stall) begin
valid <= |current;
current <= ready ? in_valid : next;
end
always_ff @(posedge clk)
if (!stall) begin
if (ready)
fragments_hold <= fragments;
out <= next_frag;
end
endmodule
|
