// retroDE_ps2 — tb_top_psmct32_feeder_native_demo (Ch334)
//
// HOST COMMAND COMPRESSION: a NATIVE rectangle record (3 staging words: color + 2 corners) that the
// FEEDER expands into two colored triangles. Same renderer, same gif_reg path — only the list format
// is richer. Acceptance: a native-rect scene matches the Ch333 explicit two-triangle COLOR_RECT
// scene by pixels, color, and records; a mixed scene combines a triangle with native rects.
//
//   NATIVE_RECT : 3 native-rect records  -> red/green/blue filled quads tiles {0,5,10}  (records=6, ==COLOR_RECT)
//   NATIVE_MIX  : red triangle(0) + 3 native rects (green5/blue10/yellow15)             (records=1+6=7)
//
// One native rect (3 words) replaces 18 explicit triangle words -> 6x host payload compression.

`timescale 1ns/1ps

module tb_top_psmct32_feeder_native_demo;

    localparam int H_ACTIVE = 64, V_ACTIVE = 64;
    localparam real MARG = 0.12;
    localparam logic [1:0] C_RUN = 2'd1, C_READY = 2'd3;

    logic clk, rst_n;
    initial clk = 1'b0;
    always #5 clk = ~clk;

    logic        core_go;
    logic [7:0]  r, g, b;
    logic        hsync, vsync, de;
    logic        core_halt, dma_done_seen, frame_seen, raster_overflow;
    logic        frame_toggle, dma_done_toggle, feeder_go_tb;

    top_psmct32_raster_demo_bram #(
        .H_ACTIVE(H_ACTIVE), .V_ACTIVE(V_ACTIVE),
        .VRAM_BYTES(32*1024), .PSMCT32_SWIZZLE(1'b0),
        .COMBINED_TAZ(1'b1), .TILE_LOCAL(1'b1), .TILE_COLS(4), .TILE_ROWS(4),
        .TILE_MULTIPRIM(1'b1), .TILE_PRIM_COUNT(4), .TILE_FIFO_DEPTH(8),
        .BIN_BUFFER_ENABLE(1'b1), .HEARTBEAT_SPLICE_ENABLE(1'b0),
        .FEEDER_ENABLE(1'b1), .FEEDER_STG_WORDS(256)
    ) dut (
        .clk(clk), .rst_n(rst_n), .core_go(core_go),
        .r(r), .g(g), .b(b), .hsync(hsync), .vsync(vsync), .de(de),
        .core_halt(core_halt), .dma_done_seen(dma_done_seen),
        .frame_seen(frame_seen), .raster_overflow(raster_overflow),
        .frame_toggle(frame_toggle), .dma_done_toggle(dma_done_toggle),
        .joy_a_pressed_i(1'b0), .joy_b_pressed_i(1'b0),
        .feeder_stg_we_i(1'b0), .feeder_stg_waddr_i(12'd0), .feeder_stg_wdata_i(64'd0),
        .feeder_go_i(feeder_go_tb),
        .feeder_ready_o(), .feeder_records_o(), .feeder_waits_o()
    );

    logic [7:0] cap_r[0:V_ACTIVE-1][0:H_ACTIVE-1], cap_g[0:V_ACTIVE-1][0:H_ACTIVE-1], cap_b[0:V_ACTIVE-1][0:H_ACTIVE-1];
    logic       cap_de[0:V_ACTIVE-1][0:H_ACTIVE-1];
    bit capture_armed;
    task automatic clear_cap;
        for (int y=0;y<V_ACTIVE;y++) for (int x=0;x<H_ACTIVE;x++) begin
            cap_r[y][x]=0; cap_g[y][x]=0; cap_b[y][x]=0; cap_de[y][x]=0; end
    endtask
    initial begin clear_cap(); capture_armed=1'b0; end
    logic [31:0] hcnt_d, vcnt_d;
    always_ff @(posedge clk) begin
        if (!rst_n) begin hcnt_d<=0; vcnt_d<=0; end
        else begin hcnt_d<=32'(dut.u_pcrtc.hcnt); vcnt_d<=32'(dut.u_pcrtc.vcnt); end
    end
    always_ff @(posedge clk)
        if (rst_n && capture_armed && de && (vcnt_d<V_ACTIVE) && (hcnt_d<H_ACTIVE)) begin
            cap_r[vcnt_d][hcnt_d]<=r; cap_g[vcnt_d][hcnt_d]<=g; cap_b[vcnt_d][hcnt_d]<=b; cap_de[vcnt_d][hcnt_d]<=1'b1; end

    function automatic int color_in_box(input int bx0, input int by0, input logic [7:0] er, eg, eb);
        int n; begin n=0;
            for (int y=by0;y<by0+16;y++) for (int x=bx0;x<bx0+16;x++)
                if (cap_de[y][x] && cap_r[y][x]===er && cap_g[y][x]===eg && cap_b[y][x]===eb) n++;
            color_in_box = n;
        end
    endfunction
    task automatic capture_frame;
        clear_cap();
        @(posedge dut.u_pcrtc.end_of_frame); @(posedge clk); capture_armed=1'b1;
        @(posedge dut.u_pcrtc.end_of_frame); @(posedge clk); capture_armed=1'b0;
    endtask
    task automatic stage_and_run(input string memfile);
        $readmemh(memfile, dut.g_feeder.feeder_stg);
        @(negedge clk); feeder_go_tb=1'b1; @(negedge clk); feeder_go_tb=1'b0;
        wait (dut.g_feeder.cst == C_RUN); wait (dut.g_feeder.cst == C_READY);
        capture_frame();
    endtask

    int errors;
    localparam logic [7:0] FF=8'hFF, ZZ=8'h00;
    task automatic want(input string lbl, input int t, input logic [7:0] er, eg, eb, input int lo, input int hi);
        int nb; nb = color_in_box((t%4)*16, (t/4)*16, er, eg, eb);
        if (nb < lo || nb > hi) begin $error("[%s] tile %0d color(%02x%02x%02x)=%0d px (want %0d..%0d)", lbl,t,er,eg,eb,nb,lo,hi); errors++; end
    endtask

    initial begin
        errors=0; feeder_go_tb=1'b0;
        $readmemh(`FEEDER_NATIVE_RECT_FILE, dut.g_feeder.feeder_stg);   // power-up = native rect

        rst_n=1'b0; core_go=1'b0;
        repeat(4) @(posedge clk); rst_n=1'b1; repeat(8) @(posedge clk);
        @(negedge clk); core_go=1'b1; @(negedge clk); core_go=1'b0;
        wait (core_halt==1'b1); repeat(4) @(posedge clk);
        wait (dma_done_seen==1'b1); repeat(10) @(posedge clk);
        if (dut.xfer_busy==1'b1) wait (dut.xfer_busy==1'b0);

        // NATIVE_RECT: red/green/blue FILLED quads (full 169px) — must MATCH Ch333 COLOR_RECT, records=6
        wait (dut.g_feeder.cst == C_READY); capture_frame();
        want("NATIVE_RECT", 0, FF,ZZ,ZZ, 130, 169); want("NATIVE_RECT", 5, ZZ,FF,ZZ, 130, 169); want("NATIVE_RECT", 10, ZZ,ZZ,FF, 130, 169);
        if (int'(dut.feeder_records)!=6) begin $error("NATIVE_RECT records=%0d (want 6 = 3 rects x 2 tris)", int'(dut.feeder_records)); errors++; end
        $display("[NATIVE_RECT] red0=%0d green5=%0d blue10=%0d records=%0d (matches COLOR_RECT)",
                 color_in_box(0,0,FF,ZZ,ZZ), color_in_box(16,16,ZZ,FF,ZZ), color_in_box(32,32,ZZ,ZZ,FF), int'(dut.feeder_records));

        // NATIVE_MIX: red TRIANGLE(0, ~91px half-tile) + green/blue/yellow native RECTS(5/10/15, full), records=7
        stage_and_run(`FEEDER_NATIVE_MIX_FILE);
        want("NATIVE_MIX", 0, FF,ZZ,ZZ, 30, 120);            // triangle = half-fill
        want("NATIVE_MIX", 5, ZZ,FF,ZZ, 130, 169);           // native rect = full
        want("NATIVE_MIX", 10, ZZ,ZZ,FF, 130, 169);
        want("NATIVE_MIX", 15, FF,FF,ZZ, 130, 169);          // yellow native rect
        if (int'(dut.feeder_records)!=7) begin $error("NATIVE_MIX records=%0d (want 7 = 1 tri + 3 rects*2)", int'(dut.feeder_records)); errors++; end
        $display("[NATIVE_MIX] redTri0=%0d green5=%0d blue10=%0d yellow15=%0d records=%0d",
                 color_in_box(0,0,FF,ZZ,ZZ), color_in_box(16,16,ZZ,FF,ZZ), color_in_box(32,32,ZZ,ZZ,FF), color_in_box(48,48,FF,FF,ZZ), int'(dut.feeder_records));

        if (raster_overflow) begin $error("raster_overflow set"); errors++; end
        if (!core_halt)      begin $error("core_halt low"); errors++; end
        $display("[tb_top_psmct32_feeder_native_demo] errors=%0d", errors);
        if (errors==0) $display("[tb_top_psmct32_feeder_native_demo] PASS");
        else           $display("[tb_top_psmct32_feeder_native_demo] FAIL");
        $finish;
    end
    initial begin #1200000000; $error("[tb_top_psmct32_feeder_native_demo] TIMEOUT"); $finish; end
endmodule : tb_top_psmct32_feeder_native_demo
