rtl/legacy_gfx: rename gfx -> legacy_gfx

1 files changed, 44 insertions, 0 deletions

diff --git a/rtl/legacy_gfx/gfx_setup_offsets.sv b/rtl/legacy_gfx/gfx_setup_offsets.sv
new file mode 100644
index 0000000..aabd322
--- /dev/null
+++ b/rtl/legacy_gfx/gfx_setup_offsets.sv
@@ -0,0 +1,44 @@
+`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