From d6bad8c35b589f7ae65cc6c82803fcfcff68573e Mon Sep 17 00:00:00 2001
From: Fang Lu <cc2lufang@gmail.com>
Date: Thu, 7 Dec 2017 17:22:55 -0600
Subject: [PATCH] polygon - shorten combinational logic
Registered output
---
gl/painters/gl_painter_polygon.sv | 10 ++++++----
gl/utils/gl_line_scanner.sv | 7 +++++--
2 files changed, 11 insertions(+), 6 deletions(-)
diff --git a/gl/painters/gl_painter_polygon.sv b/gl/painters/gl_painter_polygon.sv
index a68dfd5..9647b64 100644
--- a/gl/painters/gl_painter_polygon.sv
+++ b/gl/painters/gl_painter_polygon.sv
@@ -41,10 +41,12 @@ module gl_painter_polygon (
// Inclined line scanner instances
logic [9:0] l_x1, l_y1, l_x2, l_y2, r_x1, r_y1, r_x2, r_y2;
logic l_side, r_side;
- gl_line_scanner scanner_left(.X({6'h0, x}), .Y({6'h0, y}), .SIDE(l_side),
- .X1({6'h0,l_x1}), .Y1({6'h0,l_y1}), .X2({6'h0,l_x2}), .Y2({6'h0,l_y2}));
- gl_line_scanner scanner_right(.X({6'h0, x}), .Y({6'h0, y}), .SIDE(r_side),
- .X1({6'h0,r_x1}), .Y1({6'h0,r_y1}), .X2({6'h0,r_x2}), .Y2({6'h0,r_y2}));
+ gl_line_scanner scanner_left(.X({6'h0, x}), .Y({6'h0, y}),
+ .SIDE(l_side), .X1({6'h0,l_x1}), .Y1({6'h0,l_y1}),
+ .X2({6'h0,l_x2}), .Y2({6'h0,l_y2}), .CLOCK(CLOCK));
+ gl_line_scanner scanner_right(.X({6'h0, x}), .Y({6'h0, y}),
+ .SIDE(r_side), .X1({6'h0,r_x1}), .Y1({6'h0,r_y1}),
+ .X2({6'h0,r_x2}), .Y2({6'h0,r_y2}), .CLOCK(CLOCK));
// Midpoint tracking
logic [9:0] l_lim, l_lim_in, r_lim, r_lim_in, xbeg, xbeg_in;
diff --git a/gl/utils/gl_line_scanner.sv b/gl/utils/gl_line_scanner.sv
index 8f3c795..765e326 100644
--- a/gl/utils/gl_line_scanner.sv
+++ b/gl/utils/gl_line_scanner.sv
@@ -1,12 +1,15 @@
module gl_line_scanner (
+ input logic CLOCK,
input logic signed [15:0] X1, Y1, X2, Y2,
input logic signed [15:0] X, Y,
output logic SIDE
);
-logic signed [31:0] prod1, prod2 /*synthesis keep*/;
+logic signed [31:0] prod1, prod2;
assign prod1 = (X-X1) * (Y2-Y1);
assign prod2 = (Y-Y1) * (X2-X1);
-assign SIDE = (prod1 - prod2)>0;
+always_ff @(posedge CLOCK) begin
+ SIDE <= (prod1 - prod2)>0;
+end
endmodule
--
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