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`include "gfx/gfx_defs.sv"
module gfx_setup
(
input logic clk,
input raster_xy vertex_a,
vertex_b,
vertex_c,
input logic stall,
output raster_xy pos_ref,
output coarse_dim span_x,
span_y,
output raster_offsets_tri offsets,
output fixed_tri edge_refs,
coarse_x_offsets,
coarse_y_offsets,
coarse_test_offsets
);
// FIXME FIXME FIXME: Top-left rule
fixed_tri edge_base, edge_inc_x, edge_inc_y, out_edge_refs, x_offsets, y_offsets, test_offsets;
raster_xy bounds_ref, hold_vertex_a, hold_vertex_b, hold_vertex_c, ps[3], qs[3], out_pos_ref;
coarse_dim bounds_span_x, bounds_span_y, out_span_x, out_span_y;
raster_offsets_tri out_offsets;
struct packed
{
raster_xy pos_ref;
coarse_dim span_x,
span_y;
raster_offsets_tri offsets;
fixed_tri edge_refs,
coarse_x_offsets,
coarse_y_offsets,
coarse_test_offsets;
} out, skid_out;
gfx_skid_buf #(.WIDTH($bits(out))) skid
(
.in(out),
.out(skid_out),
.*
);
assign out.span_x = out_span_x;
assign out.span_y = out_span_y;
assign out.pos_ref = out_pos_ref;
assign out.offsets = out_offsets;
assign out.edge_refs = out_edge_refs;
assign out.coarse_x_offsets = x_offsets;
assign out.coarse_y_offsets = y_offsets;
assign out.coarse_test_offsets = test_offsets;
assign span_x = skid_out.span_x;
assign span_y = skid_out.span_y;
assign pos_ref = skid_out.pos_ref;
assign offsets = skid_out.offsets;
assign edge_refs = skid_out.edge_refs;
assign coarse_x_offsets = skid_out.coarse_x_offsets;
assign coarse_y_offsets = skid_out.coarse_y_offsets;
assign coarse_test_offsets = skid_out.coarse_test_offsets;
assign ps[0] = hold_vertex_a;
assign qs[0] = hold_vertex_b;
assign ps[1] = hold_vertex_b;
assign qs[1] = hold_vertex_c;
assign ps[2] = hold_vertex_c;
assign qs[2] = hold_vertex_a;
gfx_pipes #(.WIDTH($bits(vertex_a)), .DEPTH(`GFX_SETUP_BOUNDS_STAGES)) vertex_a_pipes
(
.in(vertex_a),
.out(hold_vertex_a),
.*
);
gfx_pipes #(.WIDTH($bits(vertex_b)), .DEPTH(`GFX_SETUP_BOUNDS_STAGES)) vertex_b_pipes
(
.in(vertex_b),
.out(hold_vertex_b),
.*
);
gfx_pipes #(.WIDTH($bits(vertex_c)), .DEPTH(`GFX_SETUP_BOUNDS_STAGES)) vertex_c_pipes
(
.in(vertex_c),
.out(hold_vertex_c),
.*
);
gfx_setup_bounds bounds
(
.span_x(bounds_span_x),
.span_y(bounds_span_y),
.reference(bounds_ref),
.*
);
localparam POST_BOUNDS_DEPTH = `GFX_SETUP_EDGE_STAGES + `GFX_SETUP_OFFSETS_STAGES;
gfx_pipes #(.WIDTH($bits(pos_ref)), .DEPTH(POST_BOUNDS_DEPTH)) ref_pipes
(
.in(bounds_ref),
.out(out_pos_ref),
.*
);
gfx_pipes #(.WIDTH($bits(span_x)), .DEPTH(POST_BOUNDS_DEPTH)) span_x_pipes
(
.in(bounds_span_x),
.out(out_span_x),
.*
);
gfx_pipes #(.WIDTH($bits(span_y)), .DEPTH(POST_BOUNDS_DEPTH)) span_y_pipes
(
.in(bounds_span_y),
.out(out_span_y),
.*
);
always_comb
for (integer i = 0; i < 3; ++i)
// Imaginárselo
unique case ({x_offsets[i][$bits(fixed) - 1], y_offsets[i][$bits(fixed) - 1]})
2'b00:
test_offsets[i] = out_offsets[i][`GFX_RASTER_OFFSETS - 1];
2'b01:
test_offsets[i] = out_offsets[i][`GFX_RASTER_SIZE - 1];
2'b10:
test_offsets[i] = out_offsets[i][`GFX_RASTER_OFFSETS - `GFX_RASTER_SIZE - 1];
2'b11:
test_offsets[i] = out_offsets[i][0];
endcase
genvar i;
generate
for (i = 0; i < 3; ++i) begin: edges
gfx_setup_edge edge_fn
(
.p(ps[i]),
.q(qs[i]),
.base(edge_base[i]),
.inc_x(edge_inc_x[i]),
.inc_y(edge_inc_y[i]),
.origin(bounds_ref),
.*
);
gfx_pipes #(.WIDTH($bits(fixed)), .DEPTH(`GFX_SETUP_OFFSETS_STAGES)) base_pipes
(
.in(edge_base[i]),
.out(out_edge_refs[i]),
.*
);
gfx_pipes #(.WIDTH($bits(fixed)), .DEPTH(`GFX_SETUP_OFFSETS_STAGES)) coarse_x_pipes
(
.in(edge_inc_x[i] << `GFX_RASTER_BITS),
.out(x_offsets[i]),
.*
);
gfx_pipes #(.WIDTH($bits(fixed)), .DEPTH(`GFX_SETUP_OFFSETS_STAGES)) coarse_y_pipes
(
.in(edge_inc_y[i] << `GFX_RASTER_BITS),
.out(y_offsets[i]),
.*
);
gfx_setup_offsets edge_offsets
(
.inc_x(edge_inc_x[i]),
.inc_y(edge_inc_y[i]),
.offsets(out_offsets[i]),
.*
);
end
endgenerate
endmodule
|
