From 5f839b88ae846c4059652669100c912d09cbe458 Mon Sep 17 00:00:00 2001
From: CrispyPin <crispin@tasa.se>
Date: Sun, 18 Aug 2024 18:30:25 +0200
Subject: [PATCH] qr shader: add version information for size 7+

---
 Assets/test/QRCode.shader | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

diff --git a/Assets/test/QRCode.shader b/Assets/test/QRCode.shader
index da4b72a..cec001d 100644
--- a/Assets/test/QRCode.shader
+++ b/Assets/test/QRCode.shader
@@ -52,6 +52,9 @@ CGPROGRAM
 	#define FORMAT_BITS_RAW ((EC_LEVEL << 3) | MASK_TYPE)
 	#define FORMAT_BITS FORMAT_BIT_SETS[FORMAT_BITS_RAW]
 
+	static const uint VERSION_BIT_SETS[34] = {0x07C94,0x085BC,0x09A99,0x0A4D3,0x0BBF6,0x0C762,0x0D847,0x0E60D,0x0F928,0x10B78,0x1145D,0x12A17,0x13532,0x149A6,0x15683,0x168C9,0x177EC,0x18EC4,0x191E1,0x1AFAB,0x1B08E,0x1CC1A,0x1D33F,0x1ED75,0x1F250,0x209D5,0x216F0,0x228BA,0x2379F,0x24B0B,0x2542E,0x26A64,0x27541,0x28C69};
+	#define VERSION_BITS (VERSION > 6 ? VERSION_BIT_SETS[VERSION - 7] : 0)
+
 	#define WHITE 1
 	#define BLACK 0
 	#define PINK float3(1, .3, .5)
@@ -121,6 +124,18 @@ CGPROGRAM
 		// bottom
 		if (px == 8 && py > WIDTH - 8) return (FORMAT_BITS & (1 << py + 15 - WIDTH)) == 0;
 
+		// version information
+		if (VERSION > 6) {
+			if (px < 6 && py > WIDTH - 12) {
+				uint b = px * 3 + py - (WIDTH - 11) ;
+				return ((VERSION_BITS >> b) & 1) == 0;
+			}
+			if (px > WIDTH - 12 && py < 6) {
+				uint b = px - (WIDTH - 11) + py * 3;
+				return ((VERSION_BITS >> b) & 1) == 0;
+			}
+		}
+
 		// data bit layout
 		uint column = (WIDTH - px - (px < 6)-1)/2;
 		uint direction_up = column % 2 == 0;