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
49
|
`include "gfx/gfx_defs.sv"
module gfx_raster_fine
#(parameter X=0, Y=0)
(
input logic clk,
input raster_xy pos,
input fixed_tri corners,
input raster_offsets_tri offsets,
input logic stall,
output frag_xy fragment,
output fixed_tri barys,
output logic paint
);
localparam INDEX = Y * `GFX_RASTER_SIZE + X;
frag_xy fragment_hold;
fixed_tri edges, per_edge_offsets;
logic[2:0] signs;
raster_xy_prec prec;
logic[`GFX_RASTER_BITS - 1:0] fine_x, fine_y;
assign prec = pos;
assign fine_x = X;
assign fine_y = Y;
always_comb
for (integer i = 0; i < 3; ++i) begin
signs[i] = edges[i][$bits(edges[0]) - 1];
per_edge_offsets[i] = offsets[i][INDEX];
end
always_ff @(posedge clk)
if (!stall) begin
barys <= edges;
paint <= signs == 0;
fragment <= fragment_hold;
fragment_hold.x <= {prec.x.sign, prec.x.coarse, fine_x};
fragment_hold.y <= {prec.y.sign, prec.y.coarse, fine_y};
for (integer i = 0; i < 3; ++i)
edges[i] <= corners[i] + per_edge_offsets[i];
end
endmodule
|
