thejayman77
ba74bbd5aa
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>
446 lines
19 KiB
Systemverilog
446 lines
19 KiB
Systemverilog
// retroDE_ps2 — tb_gs_fog
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//
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// Focused white-box TB for GS per-vertex FOG in the reduced rasterizer.
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//
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// PS2 GS fog: final_color_channel = (C * F + FOGCOL * (255 - F)) >> 8, per
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// RGB channel, where F is the 8-bit per-vertex fog coefficient (XYZF2 bits
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// [63:56]) interpolated affinely across the primitive (flat for a SPRITE),
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// gated on PRIM.FGE (bit 5). FOGCOL is GIF reg 0x3D (low 24 bits = 0xBBGGRR).
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// Alpha is NOT fogged. When FGE=0 the emit is byte-identical to the no-fog
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// path — the hard invariant.
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//
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// Tests:
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// T1 — FGE=1 triangle, FLAT color, FLAT F. Assert the emitted RGB equals the
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// EXACT hand-computed fog blend at several interior pixels, and the
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// alpha is preserved unchanged.
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// T2 — FGE=1 triangle, FLAT color, DISTINCT per-vertex F. Probe the white-box
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// s2_fog_f at interior S2 pixels and assert it matches the barycentric
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// (ground-truth) interpolated F within 1 LSB — proving F rides the
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// shared affine gradient engine like the colour/Z attributes.
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// T3 — FGE=0 triangle, SAME geometry/color as T1 with FOGCOL still set.
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// Assert the emitted color is BYTE-IDENTICAL to the raw vertex color
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// (no fog applied) — the non-negotiable invariant.
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// T4 — FGE=1 SPRITE, flat color, flat F. Assert the exact fog blend on the
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// flat-sprite emit path (s2_sprite_color64 chokepoint).
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`timescale 1ns/1ps
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module tb_gs_fog;
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logic clk;
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logic rst_n;
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initial clk = 1'b0;
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always #5 clk = ~clk;
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logic gif_reg_wr_en;
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logic [7:0] gif_reg_num;
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logic [63:0] gif_reg_data;
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logic [7:0] bg_r, bg_g, bg_b;
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logic [63:0] prim_q, rgbaq_q, xyz2_q, xyzf2_q, frame_1_q, zbuf_1_q;
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logic prim_complete;
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logic [31:0] prim_complete_count;
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logic [63:0] prim_v0_q, prim_v1_q, prim_v2_q;
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logic [63:0] prim_color_q;
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logic [63:0] prim_color_v0_q, prim_color_v1_q, prim_color_v2_q;
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trace_pkg::vertex_t prim_v0_decoded_q, prim_v1_decoded_q, prim_v2_decoded_q;
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trace_pkg::color_t prim_v0_color_decoded_q, prim_v1_color_decoded_q, prim_v2_color_decoded_q;
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logic pixel_emit;
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logic [31:0] pixel_emit_count;
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logic [11:0] pixel_x_q, pixel_y_q;
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logic [63:0] pixel_color_q;
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logic [8:0] pixel_fbp_q;
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logic [5:0] pixel_fbw_q, pixel_psm_q;
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logic [31:0] pixel_fb_addr_q;
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logic raster_pixel_emit;
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logic [31:0] raster_pixel_emit_count;
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logic [11:0] raster_pixel_x_q, raster_pixel_y_q;
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logic [63:0] raster_pixel_color_q;
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logic [31:0] raster_pixel_fb_addr_q;
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logic [3:0] raster_pixel_be_q;
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logic [31:0] raster_pixel_mask_q;
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logic [5:0] raster_pixel_psm_q;
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logic raster_active;
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logic raster_overflow;
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logic raster_fifo_full;
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logic raster_degenerate;
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logic tex_rd_en; logic [31:0] tex_rd_addr;
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logic fb_rd_en; logic [31:0] fb_rd_addr;
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logic z_rd_en; logic [31:0] z_rd_addr;
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logic ev_valid;
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trace_pkg::subsys_e ev_subsys;
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trace_pkg::event_e ev_event;
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logic [63:0] ev_arg0, ev_arg1, ev_arg2, ev_arg3;
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logic [31:0] ev_flags;
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gs_stub u_gs (
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.clk(clk), .rst_n(rst_n),
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.reg_wr_en(1'b0), .reg_wr_addr(16'd0), .reg_wr_data(64'd0),
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.gif_reg_wr_en(gif_reg_wr_en),
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.gif_reg_num(gif_reg_num),
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.gif_reg_data(gif_reg_data),
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.bg_r(bg_r), .bg_g(bg_g), .bg_b(bg_b),
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.prim_q(prim_q), .rgbaq_q(rgbaq_q),
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.xyz2_q(xyz2_q), .xyzf2_q(xyzf2_q),
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.frame_1_q(frame_1_q), .zbuf_1_q(zbuf_1_q),
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.prim_complete(prim_complete),
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.prim_complete_count(prim_complete_count),
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.prim_v0_q(prim_v0_q), .prim_v1_q(prim_v1_q), .prim_v2_q(prim_v2_q),
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.prim_color_q(prim_color_q),
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.prim_color_v0_q(prim_color_v0_q),
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.prim_color_v1_q(prim_color_v1_q),
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.prim_color_v2_q(prim_color_v2_q),
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.prim_v0_decoded_q(prim_v0_decoded_q),
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.prim_v1_decoded_q(prim_v1_decoded_q),
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.prim_v2_decoded_q(prim_v2_decoded_q),
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.prim_v0_color_decoded_q(prim_v0_color_decoded_q),
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.prim_v1_color_decoded_q(prim_v1_color_decoded_q),
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.prim_v2_color_decoded_q(prim_v2_color_decoded_q),
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.pixel_emit(pixel_emit),
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.pixel_emit_count(pixel_emit_count),
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.pixel_x_q(pixel_x_q), .pixel_y_q(pixel_y_q),
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.pixel_color_q(pixel_color_q),
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.pixel_fbp_q(pixel_fbp_q),
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.pixel_fbw_q(pixel_fbw_q),
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.pixel_psm_q(pixel_psm_q),
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.pixel_fb_addr_q(pixel_fb_addr_q),
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.raster_pixel_emit(raster_pixel_emit),
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.raster_pixel_emit_count(raster_pixel_emit_count),
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.raster_pixel_x_q(raster_pixel_x_q),
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.raster_pixel_y_q(raster_pixel_y_q),
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.raster_pixel_color_q(raster_pixel_color_q),
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.raster_pixel_fb_addr_q(raster_pixel_fb_addr_q),
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.raster_pixel_be_q(raster_pixel_be_q),
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.raster_pixel_mask_q(raster_pixel_mask_q),
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.raster_pixel_psm_q(raster_pixel_psm_q),
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.raster_active(raster_active),
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.raster_overflow(raster_overflow),
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.raster_fifo_full(raster_fifo_full),
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.raster_degenerate(raster_degenerate),
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.tex_rd_en(tex_rd_en), .tex_rd_addr(tex_rd_addr), .tex_rd_data(32'd0),
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.fb_rd_en(fb_rd_en), .fb_rd_addr(fb_rd_addr), .fb_rd_data(32'd0),
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.z_rd_en(z_rd_en), .z_rd_addr(z_rd_addr), .z_rd_data(32'd0),
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.ev_valid(ev_valid), .ev_subsys(ev_subsys), .ev_event(ev_event),
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.ev_arg0(ev_arg0), .ev_arg1(ev_arg1),
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.ev_arg2(ev_arg2), .ev_arg3(ev_arg3),
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.ev_flags(ev_flags)
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);
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// ----- Drive helpers -----
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task automatic drive_reg(input logic [7:0] num, input logic [63:0] data);
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@(negedge clk);
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gif_reg_wr_en = 1'b1; gif_reg_num = num; gif_reg_data = data;
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@(posedge clk);
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endtask
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task automatic drive_idle();
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@(negedge clk);
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gif_reg_wr_en = 1'b0; gif_reg_num = 8'd0; gif_reg_data = 64'd0;
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@(posedge clk);
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endtask
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// XYZF2 (reg 0x04): X=[15:0] (12.4), Y=[31:16] (12.4), Z=[55:32] (24b),
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// F=[63:56] (8b fog). Screen coords carry no fractional bits here.
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function automatic logic [63:0] xyzf2(input int x, input int y,
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input int z, input int f);
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return {8'(f), 24'(z), 12'(y), 4'd0, 12'(x), 4'd0};
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endfunction
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function automatic logic [63:0] rgbaq(input int r, input int g, input int b, input int a);
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return {32'd0, 8'(a), 8'(b), 8'(g), 8'(r)};
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endfunction
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localparam logic [7:0] R_PRIM = 8'h00;
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localparam logic [7:0] R_RGBAQ = 8'h01;
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localparam logic [7:0] R_XYZF2 = 8'h04;
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localparam logic [7:0] R_FOGCOL = 8'h3D;
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localparam logic [7:0] R_FRAME_1 = 8'h4C;
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localparam logic [63:0] PRIM_TRI = 64'd3; // TRI
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localparam logic [63:0] PRIM_TRI_FGE = 64'd3 | (64'd1 << 5); // TRI + FGE
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localparam logic [63:0] PRIM_SPRITE_FGE = 64'd6 | (64'd1 << 5); // SPRITE + FGE
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localparam logic [63:0] FRAME_1_VAL = 64'h0000_0000_0001_0000; // FBW=1, PSMCT32
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// FOGCOL = 0xBBGGRR
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localparam int FOG_R = 8'h20;
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localparam int FOG_G = 8'h40;
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localparam int FOG_B = 8'h60;
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localparam logic [63:0] FOGCOL_VAL = {40'd0, 8'(FOG_B), 8'(FOG_G), 8'(FOG_R)};
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// Reference fog blend (matches RTL fog_blend_abgr exactly).
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function automatic int fog_ch(input int c, input int f, input int fc);
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return (c * f + fc * (255 - f)) >> 8;
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endfunction
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function automatic int absdiff(input int a, input int b);
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return (a > b) ? (a - b) : (b - a);
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endfunction
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// ----- Independent triangle reference (edge fn, fill rule, barycentric) -----
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int vx0, vy0, vx1, vy1, vx2, vy2;
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int vf0, vf1, vf2;
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int ref_det;
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int sx1, sy1, sx2, sy2, sf1, sf2;
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function automatic int edge_f(input int px, input int py,
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input int ax, input int ay,
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input int bx, input int by);
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return (px - ax) * (by - ay) - (py - ay) * (bx - ax);
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endfunction
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task automatic setup_ref();
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int sa;
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sa = (vx1 - vx0) * (vy2 - vy0) - (vy1 - vy0) * (vx2 - vx0);
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if (sa < 0) begin
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sx1 = vx2; sy1 = vy2; sf1 = vf2;
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sx2 = vx1; sy2 = vy1; sf2 = vf1;
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ref_det = -sa;
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end else begin
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sx1 = vx1; sy1 = vy1; sf1 = vf1;
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sx2 = vx2; sy2 = vy2; sf2 = vf2;
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ref_det = sa;
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end
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endtask
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function automatic bit tol(input int ax, input int ay, input int bx, input int by);
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int dx, dy;
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dx = bx - ax; dy = by - ay;
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return (dy > 0) || ((dy == 0) && (dx > 0));
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endfunction
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function automatic bit ref_inside(input int px, input int py);
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int e0, e1, e2, b0, b1, b2;
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e0 = edge_f(px, py, vx0, vy0, sx1, sy1);
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e1 = edge_f(px, py, sx1, sy1, sx2, sy2);
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e2 = edge_f(px, py, sx2, sy2, vx0, vy0);
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b0 = tol(vx0, vy0, sx1, sy1) ? 0 : 1;
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b1 = tol(sx1, sy1, sx2, sy2) ? 0 : 1;
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b2 = tol(sx2, sy2, vx0, vy0) ? 0 : 1;
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return ((e0 + b0) <= 0) && ((e1 + b1) <= 0) && ((e2 + b2) <= 0);
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endfunction
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function automatic int ref_attr(input int px, input int py,
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input int a0, input int a1, input int a2);
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int L0, L1, L2, num;
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L0 = -edge_f(px, py, sx1, sy1, sx2, sy2);
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L1 = -edge_f(px, py, sx2, sy2, vx0, vy0);
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L2 = -edge_f(px, py, vx0, vy0, sx1, sy1);
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num = L0 * a0 + L1 * a1 + L2 * a2;
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if (ref_det == 0) return 0;
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return num / ref_det;
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endfunction
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int errors;
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// ----- Emit capture (full 32-bit ABGR) -----
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bit covered [0:15][0:15];
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logic [31:0] cap_c [0:15][0:15];
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bit cap_armed;
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task automatic clear_cov();
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for (int y = 0; y < 16; y++)
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for (int x = 0; x < 16; x++) begin
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covered[y][x] = 1'b0; cap_c[y][x] = 32'd0;
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end
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endtask
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always_ff @(posedge clk) begin
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if (rst_n && cap_armed && raster_pixel_emit
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&& raster_pixel_x_q < 16 && raster_pixel_y_q < 16) begin
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covered[raster_pixel_y_q][raster_pixel_x_q] <= 1'b1;
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cap_c [raster_pixel_y_q][raster_pixel_x_q] <= raster_pixel_color_q[31:0];
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end
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end
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// ----- T2 F-interpolation probe: white-box s2_fog_f at interior pixels -----
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int f_probe_checks;
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bit f_probe_armed;
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always_ff @(posedge clk) begin
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if (rst_n && f_probe_armed
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&& u_gs.s2_valid_q && u_gs.s2_inside_q && u_gs.ras_tri_active) begin
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int px, py, ef;
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px = int'(u_gs.s2_x_q);
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py = int'(u_gs.s2_y_q);
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if (px < 16 && py < 16 && ref_inside(px, py)) begin
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ef = ref_attr(px, py, vf0, sf1, sf2);
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if (absdiff(int'(u_gs.s2_fog_f), ef) > 1) begin
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$error("[T2 F] (%0d,%0d) s2_fog_f=%0d expected ~%0d",
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px, py, u_gs.s2_fog_f, ef);
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errors = errors + 1;
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end else begin
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f_probe_checks = f_probe_checks + 1;
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end
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end
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end
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end
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// Exact fog-blend spot check on a captured emitted pixel.
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task automatic chk_fog(input int x, input int y,
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input int cr, input int cg, input int cb, input int ca,
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input int f);
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int er, eg, eb;
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er = fog_ch(cr, f, FOG_R);
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eg = fog_ch(cg, f, FOG_G);
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eb = fog_ch(cb, f, FOG_B);
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if (!covered[y][x]) begin
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$error("[fog] (%0d,%0d) expected covered but was not", x, y);
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errors = errors + 1;
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end else if (cap_c[y][x][7:0] !== er[7:0] ||
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cap_c[y][x][15:8] !== eg[7:0] ||
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cap_c[y][x][23:16] !== eb[7:0]) begin
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$error("[fog] (%0d,%0d) got (%0d,%0d,%0d) expected EXACT (%0d,%0d,%0d)",
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x, y, cap_c[y][x][7:0], cap_c[y][x][15:8], cap_c[y][x][23:16], er, eg, eb);
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errors = errors + 1;
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end else if (cap_c[y][x][31:24] !== ca[7:0]) begin
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$error("[fog] (%0d,%0d) alpha fogged: got %0d expected %0d (unchanged)",
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x, y, cap_c[y][x][31:24], ca);
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errors = errors + 1;
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end else begin
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$display("[fog] (%0d,%0d) got (%0d,%0d,%0d,a=%0d) EXACT OK",
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x, y, cap_c[y][x][7:0], cap_c[y][x][15:8], cap_c[y][x][23:16],
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cap_c[y][x][31:24]);
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end
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endtask
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// Exact no-fog (FGE=0 invariant): emitted RGB == raw color, alpha == raw.
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task automatic chk_nofog(input int x, input int y,
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input int cr, input int cg, input int cb, input int ca);
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if (!covered[y][x]) begin
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$error("[nofog] (%0d,%0d) expected covered but was not", x, y);
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errors = errors + 1;
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end else if (cap_c[y][x][7:0] !== cr[7:0] ||
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cap_c[y][x][15:8] !== cg[7:0] ||
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cap_c[y][x][23:16] !== cb[7:0] ||
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cap_c[y][x][31:24] !== ca[7:0]) begin
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$error("[nofog] (%0d,%0d) FGE=0 NOT byte-identical: got %08x expected raw (%0d,%0d,%0d,a=%0d)",
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x, y, cap_c[y][x], cr, cg, cb, ca);
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errors = errors + 1;
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end else begin
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$display("[nofog] (%0d,%0d) FGE=0 byte-identical raw color OK", x, y);
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end
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endtask
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// Flat triangle constants.
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localparam int TC_R = 8'hC0, TC_G = 8'h80, TC_B = 8'h30, TC_A = 8'hFF;
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initial begin
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errors = 0; f_probe_checks = 0; cap_armed = 1'b0; f_probe_armed = 1'b0;
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rst_n = 1'b0; gif_reg_wr_en = 1'b0; gif_reg_num = 8'd0; gif_reg_data = 64'd0;
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clear_cov();
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repeat (4) @(posedge clk);
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rst_n = 1'b1;
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repeat (2) @(posedge clk);
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// ================================================================
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// T1 — FGE=1 triangle, FLAT color, FLAT F. Exact fog blend.
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// ================================================================
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vx0=2; vy0=1; vf0=8'h40;
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vx1=13;vy1=2; vf1=8'h40;
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vx2=5; vy2=7; vf2=8'h40;
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setup_ref();
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clear_cov(); cap_armed = 1'b1;
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drive_reg(R_FOGCOL, FOGCOL_VAL);
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drive_reg(R_PRIM, PRIM_TRI_FGE);
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drive_reg(R_FRAME_1, FRAME_1_VAL);
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drive_reg(R_RGBAQ, rgbaq(TC_R,TC_G,TC_B,TC_A));
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drive_reg(R_XYZF2, xyzf2(vx0,vy0,0,vf0));
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drive_reg(R_RGBAQ, rgbaq(TC_R,TC_G,TC_B,TC_A));
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drive_reg(R_XYZF2, xyzf2(vx1,vy1,0,vf1));
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drive_reg(R_RGBAQ, rgbaq(TC_R,TC_G,TC_B,TC_A));
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drive_reg(R_XYZF2, xyzf2(vx2,vy2,0,vf2)); // closes
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drive_idle();
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repeat (300) @(posedge clk);
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cap_armed = 1'b0;
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@(posedge clk);
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chk_fog(7, 3, TC_R, TC_G, TC_B, TC_A, 8'h40);
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chk_fog(5, 4, TC_R, TC_G, TC_B, TC_A, 8'h40);
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chk_fog(6, 2, TC_R, TC_G, TC_B, TC_A, 8'h40);
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if (raster_overflow || raster_degenerate) begin
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$error("[T1] raster anomaly"); errors = errors + 1;
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|
end
|
|
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// ================================================================
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// T2 — FGE=1 triangle, FLAT color, DISTINCT per-vertex F. Probe the
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// white-box interpolated s2_fog_f vs barycentric ground truth.
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// ================================================================
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vx0=2; vy0=1; vf0=8'h10;
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vx1=13;vy1=2; vf1=8'hF0;
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vx2=5; vy2=7; vf2=8'h80;
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setup_ref();
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|
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f_probe_armed = 1'b1;
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drive_reg(R_PRIM, PRIM_TRI_FGE);
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drive_reg(R_FRAME_1, FRAME_1_VAL);
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drive_reg(R_RGBAQ, rgbaq(TC_R,TC_G,TC_B,TC_A));
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drive_reg(R_XYZF2, xyzf2(vx0,vy0,0,vf0));
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drive_reg(R_RGBAQ, rgbaq(TC_R,TC_G,TC_B,TC_A));
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drive_reg(R_XYZF2, xyzf2(vx1,vy1,0,vf1));
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|
drive_reg(R_RGBAQ, rgbaq(TC_R,TC_G,TC_B,TC_A));
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drive_reg(R_XYZF2, xyzf2(vx2,vy2,0,vf2)); // closes
|
|
drive_idle();
|
|
repeat (320) @(posedge clk);
|
|
f_probe_armed = 1'b0;
|
|
@(posedge clk);
|
|
if (f_probe_checks == 0) begin
|
|
$error("[T2] no interior F pixels observed"); errors = errors + 1;
|
|
end
|
|
|
|
// ================================================================
|
|
// T3 — FGE=0 triangle, SAME geometry/color as T1, FOGCOL still set.
|
|
// Emitted color MUST be byte-identical to the raw vertex color.
|
|
// ================================================================
|
|
vx0=2; vy0=1; vf0=8'h40;
|
|
vx1=13;vy1=2; vf1=8'h40;
|
|
vx2=5; vy2=7; vf2=8'h40;
|
|
setup_ref();
|
|
|
|
clear_cov(); cap_armed = 1'b1;
|
|
drive_reg(R_PRIM, PRIM_TRI); // FGE = 0
|
|
drive_reg(R_FRAME_1, FRAME_1_VAL);
|
|
drive_reg(R_RGBAQ, rgbaq(TC_R,TC_G,TC_B,TC_A));
|
|
drive_reg(R_XYZF2, xyzf2(vx0,vy0,0,vf0));
|
|
drive_reg(R_RGBAQ, rgbaq(TC_R,TC_G,TC_B,TC_A));
|
|
drive_reg(R_XYZF2, xyzf2(vx1,vy1,0,vf1));
|
|
drive_reg(R_RGBAQ, rgbaq(TC_R,TC_G,TC_B,TC_A));
|
|
drive_reg(R_XYZF2, xyzf2(vx2,vy2,0,vf2)); // closes
|
|
drive_idle();
|
|
repeat (300) @(posedge clk);
|
|
cap_armed = 1'b0;
|
|
@(posedge clk);
|
|
|
|
chk_nofog(7, 3, TC_R, TC_G, TC_B, TC_A);
|
|
chk_nofog(5, 4, TC_R, TC_G, TC_B, TC_A);
|
|
chk_nofog(6, 2, TC_R, TC_G, TC_B, TC_A);
|
|
|
|
// ================================================================
|
|
// T4 — FGE=1 SPRITE, flat color, flat F. Exact fog blend on the
|
|
// sprite emit chokepoint (s2_sprite_color64).
|
|
// ================================================================
|
|
clear_cov(); cap_armed = 1'b1;
|
|
drive_reg(R_PRIM, PRIM_SPRITE_FGE);
|
|
drive_reg(R_FRAME_1, FRAME_1_VAL);
|
|
drive_reg(R_RGBAQ, rgbaq(TC_R,TC_G,TC_B,TC_A));
|
|
drive_reg(R_XYZF2, xyzf2(1, 1, 0, 8'hA0)); // sprite origin vertex
|
|
drive_reg(R_XYZF2, xyzf2(5, 5, 0, 8'hA0)); // closing vertex -> flat F=0xA0
|
|
drive_idle();
|
|
repeat (200) @(posedge clk);
|
|
cap_armed = 1'b0;
|
|
@(posedge clk);
|
|
|
|
// Interior sprite pixels (rect [1,5)x[1,5)).
|
|
chk_fog(2, 2, TC_R, TC_G, TC_B, TC_A, 8'hA0);
|
|
chk_fog(3, 4, TC_R, TC_G, TC_B, TC_A, 8'hA0);
|
|
chk_fog(4, 1, TC_R, TC_G, TC_B, TC_A, 8'hA0);
|
|
|
|
$display("[tb_gs_fog] T2 f_checks=%0d errors=%0d", f_probe_checks, errors);
|
|
if (errors == 0) $display("[tb_gs_fog] PASS");
|
|
else $display("[tb_gs_fog] FAIL");
|
|
$finish;
|
|
end
|
|
|
|
initial begin
|
|
#5000000;
|
|
$error("[tb_gs_fog] timeout");
|
|
$finish;
|
|
end
|
|
|
|
endmodule : tb_gs_fog
|