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`include "gfx/gfx_defs.sv"
module gfx_setup_offsets
(
input logic clk,
input fixed inc_x,
inc_y,
input logic stall,
output raster_offsets offsets
);
fixed x_hold[`GFX_RASTER_SIZE], y_hold[`GFX_RASTER_SIZE],
x_multiples[`GFX_RASTER_SIZE], y_multiples[`GFX_RASTER_SIZE];
// Asume GFX_RASTER_BITS == 2. Los ceros deberían optimizarse trivialmente
assign x_multiples[0] = 0;
assign y_multiples[0] = 0;
assign x_multiples[1] = inc_x;
assign y_multiples[1] = inc_y;
assign x_multiples[2] = inc_x << 1;
assign y_multiples[2] = inc_y << 1;
assign x_multiples[3] = (inc_x << 1) + inc_x;
assign y_multiples[3] = (inc_y << 1) + inc_y;
genvar i;
generate
for (i = 0; i < `GFX_RASTER_SIZE; ++i) begin: multiples
always_ff @(posedge clk)
if (!stall) begin
x_hold[i] <= x_multiples[i];
y_hold[i] <= y_multiples[i];
end
end
for (i = 0; i < `GFX_RASTER_OFFSETS; ++i) begin: permutations
always_ff @(posedge clk)
if (!stall)
offsets[i] <= x_hold[i % `GFX_RASTER_SIZE] + y_hold[i / `GFX_RASTER_SIZE];
end
endgenerate
endmodule
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