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`include "gfx/gfx_defs.sv"
module gfx_masks
(
input logic clk,
rst_n,
input logic swap_buffers,
input cmd_word fb_base_a,
fb_base_b,
input linear_coord scan_mask_addr,
output logic scan_mask,
input logic frag_mask_write,
frag_mask_set,
input linear_coord frag_mask_read_addr,
frag_mask_write_addr,
output logic frag_mask,
output vram_addr frag_base,
scan_base
);
logic mask_a, mask_b, frag_write_hold, frag_set_hold;
linear_coord scan_addr_hold, frag_write_addr_hold, frag_read_addr_hold;
gfx_mask_sram sram_a
(
.set(frag_set_hold),
.mask(mask_a),
.write(swap_buffers && frag_write_hold),
.read_addr(swap_buffers ? frag_read_addr_hold : scan_addr_hold),
.write_addr(frag_write_addr_hold),
.*
);
gfx_mask_sram sram_b
(
.set(frag_set_hold),
.mask(mask_b),
.write(!swap_buffers && frag_write_hold),
.read_addr(swap_buffers ? scan_addr_hold : frag_read_addr_hold),
.write_addr(frag_write_addr_hold),
.*
);
always_ff @(posedge clk or negedge rst_n)
if (!rst_n) begin
frag_base <= 0;
scan_base <= 0;
end else begin
frag_base <= swap_buffers ? fb_base_a[$bits(vram_addr):1] : fb_base_b[$bits(vram_addr):1];
scan_base <= swap_buffers ? fb_base_b[$bits(vram_addr):1] : fb_base_a[$bits(vram_addr):1];
end
always_ff @(posedge clk) begin
scan_mask <= swap_buffers ? mask_b : mask_a;
scan_addr_hold <= scan_mask_addr;
frag_mask <= swap_buffers ? mask_a : mask_b;
frag_set_hold <= frag_mask_set;
frag_write_hold <= frag_mask_write;
frag_read_addr_hold <= frag_mask_read_addr;
frag_write_addr_hold <= frag_mask_write_addr;
end
endmodule
|
