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Snapshot: fog implementation + fidelity tooling baseline (pre bilinear-clamp fix)

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Per-vertex GS fog end-to-end (gs_stub emit incl. persp_emit5, gs_prim_list_feeder
XYZ2->XYZF2 on PRIM.FGE, gs_make_sh3_scheduler_fixture.py F/FGE packing), new fog
TBs, fidelity attribution tooling. Functional baseline before removing the dead
bilinear lerp8 clamps (Codex: 161-node comb loop -> -0.042ns setup fail).

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
This commit is contained in:
thejayman77
2026-07-20 19:56:46 -04:00
parent ec82764bef
commit ba74bbd5aa
476 changed files with 696247 additions and 130119 deletions
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rtl/gif_gs/gs_lpddr_wr_arb.sv
+13 -8
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@@ -121,24 +121,28 @@ module gs_lpddr_wr_arb (
// so AW sets it first, but tracking either makes this a GENERAL AXI write arbiter that never
// abandons a transaction regardless of AW/W ordering (Codex audit note).
reg aw_done; // a write beat/addr accepted for the active grant -> never abort past here
// Ch368 -- arm EMIF BREADY from the final W handshake, rather than feeding it through the
// live grant/client-ready mux. All current writers enter their B-wait state on that same
// handshake (or hold BREADY high), so this preserves the AW->W->B contract while cutting
// the grant/bready -> EMIF response-FIFO timing cone.
reg bready_q;
reg [21:0] watchdog; // pre-commit only; ~6.7 ms @ 310 MHz dead-bus backstop
wire wd_expired = watchdog[21];
wire sel_bready = (grant==3'd1)?s0_bready:(grant==3'd2)?s1_bready:
(grant==3'd3)?s2_bready:(grant==3'd4)?s3_bready:1'b1;
always_ff @(posedge clk or negedge rst_n) begin
if (!rst_n) begin
grant <= 3'd0; aw_done <= 1'b0; watchdog <= '0;
grant <= 3'd0; aw_done <= 1'b0; bready_q <= 1'b0; watchdog <= '0;
end else if (grant == 3'd0) begin
aw_done <= 1'b0; watchdog <= '0;
aw_done <= 1'b0; bready_q <= 1'b0; watchdog <= '0;
if (s0_awvalid) grant <= 3'd1; // FB writer (highest)
else if (s2_awvalid) grant <= 3'd3; // Z spill (render-flush)
else if (s1_awvalid) grant <= 3'd2; // color spill (render-flush)
else if (s3_awvalid) grant <= 3'd4; // HPS write-probe (debug, lowest)
end else begin
if ((m_awvalid && m_awready) || (m_wvalid && m_wready)) aw_done <= 1'b1; // AW or W accepted -> COMMITTED
if (m_bvalid && sel_bready) begin
grant <= 3'd0; aw_done <= 1'b0; watchdog <= '0; // B delivered -> release
if (m_wvalid && m_wready && m_wlast) bready_q <= 1'b1;
if (m_bvalid && bready_q) begin
grant <= 3'd0; aw_done <= 1'b0; bready_q <= 1'b0; watchdog <= '0; // B delivered -> release
end else if (!aw_done) begin // still waiting for AW (nothing owed)
if (wd_expired) begin grant <= 3'd0; aw_done <= 1'b0; watchdog <= '0; end
else watchdog <= watchdog + 22'd1;
@@ -169,11 +173,12 @@ module gs_lpddr_wr_arb (
assign s2_wready = (grant==3'd3)?m_wready:1'b0;
assign s3_wready = (grant==3'd4)?m_wready:1'b0;
// B demux (idle: bready=1 drains any stale/late response)
// B demux. bready_q arms exactly after the selected final W handshake, one cycle before
// the earliest response the existing writers can consume. It is held through B acceptance.
assign s0_bresp = m_bresp; assign s1_bresp = m_bresp; assign s2_bresp = m_bresp; assign s3_bresp = m_bresp;
assign s0_bvalid = (grant==3'd1)?m_bvalid:1'b0;
assign s1_bvalid = (grant==3'd2)?m_bvalid:1'b0;
assign s2_bvalid = (grant==3'd3)?m_bvalid:1'b0;
assign s3_bvalid = (grant==3'd4)?m_bvalid:1'b0;
assign m_bready = (grant==3'd1)?s0_bready:(grant==3'd2)?s1_bready:(grant==3'd3)?s2_bready:(grant==3'd4)?s3_bready:1'b1;
assign m_bready = bready_q;
endmodule