rtl/legacy_gfx: rename gfx -> legacy_gfx

1 files changed, 49 insertions, 0 deletions

diff --git a/rtl/legacy_gfx/gfx_raster_fine.sv b/rtl/legacy_gfx/gfx_raster_fine.sv
new file mode 100644
index 0000000..da11b6f
--- /dev/null
+++ b/rtl/legacy_gfx/gfx_raster_fine.sv
@@ -0,0 +1,49 @@
+`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