From 25342673c441b00baf661e89cc3e4dd1a2cf7213 Mon Sep 17 00:00:00 2001
From: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Date: Fri, 17 Jun 2016 01:41:54 +0300
Subject: Add LUT generation script

Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
---
 data/frames/.gitignore |  1 +
 data/frames/Makefile   |  3 ++
 data/frames/gen-lut.py | 82 ++++++++++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 86 insertions(+)
 create mode 100644 data/frames/.gitignore
 create mode 100755 data/frames/gen-lut.py

(limited to 'data/frames')

diff --git a/data/frames/.gitignore b/data/frames/.gitignore
new file mode 100644
index 0000000..a8a0dce
--- /dev/null
+++ b/data/frames/.gitignore
@@ -0,0 +1 @@
+*.bin
diff --git a/data/frames/Makefile b/data/frames/Makefile
index 04ea2b2..dba2799 100644
--- a/data/frames/Makefile
+++ b/data/frames/Makefile
@@ -1,6 +1,8 @@
 all:
+	./gen-lut.py
 
 clean:
+	@rm -f *.bin
 
 install:
 	mkdir -p $(INSTALL_DIR)/frames/
@@ -8,3 +10,4 @@ install:
 		gzip -dk $(frame)
 		mv ${frame/.gz/} $(INSTALL_DIR)/frames/
 	done
+	cp *.bin $(INSTALL_DIR)/frames/
diff --git a/data/frames/gen-lut.py b/data/frames/gen-lut.py
new file mode 100755
index 0000000..f180ad6
--- /dev/null
+++ b/data/frames/gen-lut.py
@@ -0,0 +1,82 @@
+#!/usr/bin/python
+
+import math
+import sys
+
+clu_configs = (
+	('zero', {
+		'scale': 0.0,
+		'a': 0.0,
+		'freq': 1.0,
+		'weights': (1.0, 1.0, 1.0)
+	} ),
+	('identity', {
+		'scale': 1.0,
+		'a': 0.0,
+		'freq': 1.0,
+		'weights': (1.0, 1.0, 1.0)
+	} ),
+	# Keep the three weights different to generate an anisothropic
+	# look up table.
+	('wave', {
+		'scale': 1.0,
+		'a': 0.1,
+		'freq': 3.0,
+		'weights': (1.0, 2.0, 3.0)
+	} ),
+)
+
+lut_configs = (
+	('zero',	0.0, 1.0, 1.0, 1.0),
+	('identity',	1.0, 1.0, 1.0, 1.0),
+	('gamma',	1.0, 0.5, 1.0, 2.0),
+)
+
+def clu_value(x, y, z, scale, a, freq, weights):
+	x = x / 16.
+	y = y / 16.
+	z = z / 16.
+
+	dist = math.sqrt((x*x*weights[0] + y*y*weights[1] + z*z*weights[2]) / 3. / sum(weights))
+	offset = a * math.sin(dist * freq * 2 * math.pi)
+
+	x = max(0, min(255, int((x*scale + offset) * 256)))
+	y = max(0, min(255, int((y*scale + offset) * 256)))
+	z = max(0, min(255, int((z*scale + offset) * 256)))
+
+	return (z, y, x, 0)
+
+def generate_clu(config):
+	clu = []
+
+	for z in xrange(17):
+		for y in xrange(17):
+			for x in xrange(17):
+				clu.extend(clu_value(x, y, z, **config[1]))
+
+	file('clu-%s.bin' % config[0], 'wb').write(''.join([chr(c) for c in clu]))
+
+
+def gamma(vin, gamma, scale):
+	return int(255 * scale * math.pow(vin / 255., gamma))
+
+def generate_lut(config):
+	lut = []
+	for i in xrange(256):
+		lut.extend([gamma(i, g, config[1]) for g in config[2:]])
+		lut.append(0)
+
+	file('lut-%s.bin' % config[0], 'wb').write(''.join([chr(c) for c in lut]))
+
+
+def main(argv):
+	for config in clu_configs:
+		generate_clu(config)
+
+	for config in lut_configs:
+		generate_lut(config)
+
+	return 0
+
+if __name__ == '__main__':
+	sys.exit(main(sys.argv))
-- 
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