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`include "gfx/gfx_defs.sv"
module gfx_frag_bary
(
input logic clk,
input fixed_tri bary,
ws,
input logic stall,
output fixed b1,
b2
);
fixed area, b0_w0, b1_w1, b2_w2, b1_w1_b2_w2, hold_b0_w0, hold_b1_w1, hold_b2_w2;
fixed_tri bs_ws, orthographic_bs;
assign b0_w0 = bs_ws[0];
assign b1_w1 = bs_ws[1];
assign b2_w2 = bs_ws[2];
assign orthographic_bs[0] = bary[`EDGE_P1_TO_P2];
assign orthographic_bs[1] = bary[`EDGE_P2_TO_P0];
assign orthographic_bs[2] = bary[`EDGE_P0_TO_P1];
genvar i;
generate
for (i = 0; i < 3; ++i) begin: vertices
gfx_fixed_div div_b_w
(
.z(orthographic_bs[i]),
.d(ws[i]),
.q(bs_ws[i]),
.*
);
end
endgenerate
localparam AREA_STAGES = 2;
gfx_pipes #(.WIDTH($bits(fixed)), .DEPTH(AREA_STAGES)) b1_w1_pipes
(
.in(b1_w1),
.out(hold_b1_w1),
.*
);
gfx_pipes #(.WIDTH($bits(fixed)), .DEPTH(AREA_STAGES)) b2_w2_pipes
(
.in(b2_w2),
.out(hold_b2_w2),
.*
);
gfx_fixed_div norm_b1
(
.z(hold_b1_w1),
.d(area),
.q(b1),
.*
);
gfx_fixed_div norm_b2
(
.z(hold_b2_w2),
.d(area),
.q(b2),
.*
);
always_ff @(posedge clk)
if (!stall) begin
area <= hold_b0_w0 + b1_w1_b2_w2;
hold_b0_w0 <= b0_w0;
b1_w1_b2_w2 <= b1_w1 + b2_w2;
end
endmodule
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