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|
`include "gfx/gfx_defs.sv"
module gfx_frag_shade
(
input logic clk,
input fixed b1,
b2,
input color_lerp_lanes argb0,
argb1_argb0,
argb2_argb0,
input logic stall,
output rgb32 color
);
struct packed
{
logic sign;
logic[$bits(fixed) - `FIXED_FRAC - 2:0] out_of_range;
color8 color;
logic[`FIXED_FRAC - $bits(color8) - 1:0] sub;
} lerped[`COLOR_CHANNELS];
fixed channel_lerp[`COLOR_CHANNELS];
color8[`COLOR_CHANNELS - 1:0] out;
assign color = out;
genvar i;
generate
for (i = 0; i < `COLOR_CHANNELS; ++i) begin: channels
assign lerped[i] = channel_lerp[i];
gfx_lerp lerp
(
.q(channel_lerp[i]),
.q0(argb0[i]),
.q1_q0(argb1_argb0[i]),
.q2_q0(argb2_argb0[i]),
.*
);
always_ff @(posedge clk)
if (!stall) begin
out[i] <= lerped[i].color;
if (lerped[i].sign || |lerped[i].out_of_range)
out[i] <= {($bits(color8)){!lerped[i].sign}};
end
end
endgenerate
endmodule
|
