1 From 43549773608b4f58dc664b7115a1ef0dcb32f251 Mon Sep 17 00:00:00 2001
2 From: Haihua Hu <jared.hu@nxp.com>
3 Date: Tue, 14 Jun 2016 13:48:09 +0800
4 Subject: [PATCH 1/2] [glplugin]gleffects: fix little rectangel appears at the
5 center when use squeeze and tunnel effects
7 These two shader will calculate the verctor length and use it as denominator.
8 But length could be zero which will cause undefine behaviour. Add protection for
11 Upstream-Status: Backport [1.8.3]
13 https://bugzilla.gnome.org/show_bug.cgi?id=767635
15 Signed-off-by: Haihua Hu <jared.hu@nxp.com>
17 ext/gl/effects/gstgleffectssources.c | 6 ++++--
18 1 file changed, 4 insertions(+), 2 deletions(-)
20 diff --git a/ext/gl/effects/gstgleffectssources.c b/ext/gl/effects/gstgleffectssources.c
21 index 6bdc155..3e87b8b 100644
22 --- a/ext/gl/effects/gstgleffectssources.c
23 +++ b/ext/gl/effects/gstgleffectssources.c
24 @@ -100,7 +100,8 @@ const gchar *squeeze_fragment_source_gles2 =
26 " vec2 texturecoord = v_texcoord.xy;"
27 " vec2 normcoord = texturecoord - 0.5;"
28 - " float r = length (normcoord);"
29 + /* Add a very small value to length otherwise it could be 0 */
30 + " float r = length (normcoord)+0.01;"
31 " r = pow(r, 0.40)*1.3;"
32 " normcoord = normcoord / r;"
33 " texturecoord = (normcoord + 0.5);"
34 @@ -136,7 +137,8 @@ const gchar *tunnel_fragment_source_gles2 =
36 " normcoord = (texturecoord - 0.5);"
37 " float r = length(normcoord);"
38 - " normcoord *= clamp (r, 0.0, 0.275) / r;"
40 + " normcoord *= clamp (r, 0.0, 0.275) / r;"
41 " texturecoord = normcoord + 0.5;"
42 " gl_FragColor = texture2D (tex, texturecoord);"