From 3417651da0ffebfbfb00a3228ef11e21fe7dfaa1 Mon Sep 17 00:00:00 2001 From: Alejandro Soto Date: Thu, 2 Nov 2023 21:32:43 -0600 Subject: rtl/gfx: implement edge offset setup --- rtl/gfx/gfx_setup_offsets.sv | 44 ++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 44 insertions(+) create mode 100644 rtl/gfx/gfx_setup_offsets.sv (limited to 'rtl/gfx/gfx_setup_offsets.sv') diff --git a/rtl/gfx/gfx_setup_offsets.sv b/rtl/gfx/gfx_setup_offsets.sv new file mode 100644 index 0000000..3b615d5 --- /dev/null +++ b/rtl/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 fixed offsets[`GFX_RASTER_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) + a; + assign y_multiples[3] = (inc_y << 1) + b; + + 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 -- cgit v1.2.3