1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
|
`include "gfx/gfx_defs.sv"
module gfx_fine
#(parameter X=0, Y=0)
(
input logic clk,
input raster_xy pos,
input fixed corner_a,
corner_b,
corner_c,
input fixed offsets_a[`GFX_RASTER_OFFSETS],
offsets_b[`GFX_RASTER_OFFSETS],
offsets_c[`GFX_RASTER_OFFSETS],
input logic stall,
output frag_xy fragment,
output logic paint
);
localparam INDEX = Y * `GFX_RASTER_SIZE + X;
fixed edge_a, edge_b, edge_c, offset_a, offset_b, offset_c;
logic sign_a, sign_b, sign_c;
frag_xy fragment_hold;
assign offset_a = offsets_a[INDEX];
assign offset_b = offsets_b[INDEX];
assign offset_c = offsets_c[INDEX];
assign sign_a = edge_a[$bits(edge_a) - 1];
assign sign_b = edge_b[$bits(edge_b) - 1];
assign sign_c = edge_c[$bits(edge_c) - 1];
always_ff @(posedge clk)
if (!stall) begin
paint <= !sign_a && !sign_b && !sign_c;
fragment <= fragment_hold;
fragment_hold.x <= pos.x.frag.num;
fragment_hold.y <= pos.y.frag.num;
edge_a <= corner_a + offset_a;
edge_b <= corner_b + offset_b;
edge_c <= corner_c + offset_c;
end
endmodule
|
