From adabbf5f30729092a64fa1059bbc7d7b09d6b24e Mon Sep 17 00:00:00 2001
From: Alejandro Soto <alejandro@34project.org>
Date: Sun, 29 Oct 2023 15:35:42 -0600
Subject: rtl/gfx: implement double-buffered scanout

---
 rtl/gfx/gfx.sv | 45 ++++++++++++++++++++++++++++++++++++++++++++-
 1 file changed, 44 insertions(+), 1 deletion(-)

(limited to 'rtl/gfx/gfx.sv')

diff --git a/rtl/gfx/gfx.sv b/rtl/gfx/gfx.sv
index bae65e3..7749c50 100644
--- a/rtl/gfx/gfx.sv
+++ b/rtl/gfx/gfx.sv
@@ -17,7 +17,13 @@ module gfx
 	output logic[25:0] mem_address,
 	output logic       mem_read,
 	                   mem_write,
-	output logic[15:0] mem_writedata
+	output logic[15:0] mem_writedata,
+
+	input  logic       scan_ready,
+	output logic       scan_valid,
+	                   scan_endofpacket,
+	                   scan_startofpacket,
+	output rgb30       scan_data
 );
 
 	fp readdata, writedata;
@@ -60,6 +66,43 @@ module gfx
 		.*
 	);
 
+	logic frag_mask, scan_mask;
+
+	gfx_masks masks
+	(
+		.frag_mask_set(0),
+		.frag_mask_write(0),
+		.frag_mask_read_addr(),
+		.frag_mask_write_addr(),
+		.*
+	);
+
+	logic swap_buffers;
+	rgb24 clear_color;
+
+	assign swap_buffers = 0;
+	assign clear_color.r = 255;
+	assign clear_color.g = 0;
+	assign clear_color.b = 0;
+
+	linear_coord scan_mask_addr;
+
+	logic scanout_read_tmp;
+
+	gfx_scanout scanout
+	(
+		.mask(scan_mask),
+		.mask_addr(scan_mask_addr),
+
+		.fb_read(scanout_read_tmp),
+		.fb_address(),
+		.fb_readdata(),
+		.fb_waitrequest(0),
+		.fb_readdatavalid(scanout_read_tmp),
+
+		.*
+	);
+
 	logic[63:0] cnt_cycles, cnt_trans, snp_cycles, snp_trans;
 	logic[24:0] cnt_addr;
 	logic[31:0] cnt_done, cnt_start;
-- 
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