From 2f7d83839e0ad90cd4476ed5da9fcbf6d5720b62 Mon Sep 17 00:00:00 2001
From: "sgunderson@bigfoot.com" <>
Date: Sat, 18 Jul 2009 20:17:19 +0200
Subject: [PATCH] Write TGAs directly instead of flipped PPMs.

---
 glcapture.c | 16 ++++++++++++----
 1 file changed, 12 insertions(+), 4 deletions(-)

diff --git a/glcapture.c b/glcapture.c
index c67c87d..e4af408 100644
--- a/glcapture.c
+++ b/glcapture.c
@@ -3,7 +3,6 @@
  *
  * gcc -shared -fPIC -o glcapture.so glcapture.c -ldl
  * LD_PRELOAD=`pwd`/glcapture.so ./demo
- * for FILE in *.ppm; do convert -flip $FILE ${FILE/ppm/tga}; echo $FILE; done
  * mencoder -noskip -endpos 76.920 -ovc x264 -x264encopts bitrate=3000:pass=1 -audiofile data/Juledemo.ogg -o tufs.avi mf://\*.tga -mf fps=50 -oac mp3lame -lameopts cbr:br=128
  * mencoder -noskip -endpos 76.920 -ovc x264 -x264encopts bitrate=3000:pass=2 -audiofile data/Juledemo.ogg -o tufs.avi mf://\*.tga -mf fps=50 -oac mp3lame -lameopts cbr:br=128
  */
@@ -31,11 +30,20 @@ void glXSwapBuffers( Display *dpy, GLXDrawable drawable )
 
 	FILE *ppm;
 	char filename[256];
-	glReadPixels(0, 0, WIDTH, HEIGHT, GL_RGB, GL_UNSIGNED_BYTE, buf);
+	glReadPixels(0, 0, WIDTH, HEIGHT, GL_BGR, GL_UNSIGNED_BYTE, buf);
 
-	sprintf(filename, "frame%05u.ppm", frameno++);
+	sprintf(filename, "frame%05u.tga", frameno++);
 	ppm = fopen(filename, "w");
-	fprintf(ppm, "P6\nWIDTH HEIGHT\n255\n");
+	fwrite("\x00\x00\x02\x00\x00\x00\x00\x00\x00\x00\x00\x00", 12, 1, ppm);
+	{
+		unsigned short w = WIDTH;
+		fwrite(&w, 2, 1, ppm);
+	}
+	{
+		unsigned short h = HEIGHT;
+		fwrite(&h, 2, 1, ppm);
+	}
+	fwrite("\x18\x00", 2, 1, ppm);
 	fwrite(buf, WIDTH*HEIGHT*3, 1, ppm);
 	fclose(ppm);
 
-- 
2.39.2