From bdb2c20d59381c021730afb6d0d81927b870817d Mon Sep 17 00:00:00 2001
From: CrispyPin <crispin@tasa.se>
Date: Fri, 16 Aug 2024 14:46:24 +0200
Subject: [PATCH] qr shader: add format ec bits

---
 Assets/test/QRCode.shader | 29 +++++++++++++++++++++--------
 1 file changed, 21 insertions(+), 8 deletions(-)

diff --git a/Assets/test/QRCode.shader b/Assets/test/QRCode.shader
index cb4b7ce..1a82d27 100644
--- a/Assets/test/QRCode.shader
+++ b/Assets/test/QRCode.shader
@@ -18,9 +18,17 @@ CGPROGRAM
 	#define ALIGNER_SPACING ((WIDTH - 13) / (ALIGNERS-1))
 	#define MISALIGNMENT ((WIDTH - 13) % (ALIGNERS-1))
 
-	#define EC_LEVEL (3)
-	#define MASK_TYPE (4)
-	#define FORMAT_BITS ((EC_LEVEL << 3) | MASK_TYPE)
+	#define EC_LEVEL_L 1
+	#define EC_LEVEL_M 0
+	#define EC_LEVEL_Q 3
+	#define EC_LEVEL_H 2
+
+	#define EC_LEVEL EC_LEVEL_L
+	#define MASK_TYPE 1
+
+	static const uint FORMAT_BIT_SETS[32] = {0x5412, 0x5125, 0x5e7c, 0x5b4b, 0x45f9, 0x40ce, 0x4f97, 0x4aa0, 0x77c4, 0x72f3, 0x7daa, 0x789d, 0x662f, 0x6318, 0x6c41, 0x6976, 0x1689, 0x13be, 0x1ce7, 0x19d0, 0x0762, 0x0255, 0x0d0c, 0x083b, 0x355f, 0x3068, 0x3f31, 0x3a06, 0x24b4, 0x2183, 0x2eda, 0x2bed};
+	#define FORMAT_BITS_RAW ((EC_LEVEL << 3) | MASK_TYPE)
+	#define FORMAT_BITS FORMAT_BIT_SETS[FORMAT_BITS_RAW]
 
 	/*
 	v = 15
@@ -88,11 +96,16 @@ CGPROGRAM
 		}
 
 		// Format bits
-		if (px < 5 && py == 8) return (FORMAT_BITS & (1 << (4 - px))) == 0;
-		if (px == 8 && py > WIDTH - 6) return (FORMAT_BITS & (1 << py + 5 - WIDTH)) == 0;
-
-		if (px == 8 && (py < 9 || py > WIDTH - 9)) return PINK;
-		if (py == 8 && (px < 9 || px > WIDTH - 9)) return PINK;
+		// left
+		if (px < 6 && py == 8) return (FORMAT_BITS & (1 << (14 - px))) == 0;
+		if (px == 7 && py == 8) return (FORMAT_BITS & (1 << 8)) == 0;
+		// right
+		if (px > WIDTH - 9 && py == 8) return (FORMAT_BITS & (1 << (WIDTH - 1 - px))) == 0;
+		// top
+		if (px == 8 && py < 6) return (FORMAT_BITS & (1 << py)) == 0;
+		if (px == 8 && py < 9) return (FORMAT_BITS & (1 << (py-1))) == 0;
+		// bottom
+		if (px == 8 && py > WIDTH - 8) return (FORMAT_BITS & (1 << py + 15 - WIDTH)) == 0;
 
 		uint column = (WIDTH - px - (px > 6))/2;
 		uint direction_up = column & 1;