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gleffects: fix little rectangle that appears at the center of squeeze and tunnel effects

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These two shader will calculate the vector length and use it as denominator.
But length could be zero which will cause undefine behaviour. Add protection for
this condition

https://bugzilla.gnome.org/show_bug.cgi?id=767635
This commit is contained in:
Haihua Hu 2016-06-14 13:48:09 +08:00 committed by Matthew Waters
parent 861ce43cd8
commit 5e8a650130
1 changed files with 4 additions and 2 deletions
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6
ext/gl/effects/gstgleffectssources.c
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@ -100,7 +100,8 @@ const gchar *squeeze_fragment_source_gles2 =
"void main () {"
" vec2 texturecoord = v_texcoord.xy;"
" vec2 normcoord = texturecoord - 0.5;"
" float r = length (normcoord);"
/* Add a very small value to length otherwise it could be 0 */
" float r = length (normcoord)+0.01;"
" r = pow(r, 0.40)*1.3;"
" normcoord = normcoord / r;"
" texturecoord = (normcoord + 0.5);"
@ -136,7 +137,8 @@ const gchar *tunnel_fragment_source_gles2 =
* rect textures */
" normcoord = (texturecoord - 0.5);"
" float r = length(normcoord);"
" normcoord *= clamp (r, 0.0, 0.275) / r;"
" if (r > 0.0)"
" normcoord *= clamp (r, 0.0, 0.275) / r;"
" texturecoord = normcoord + 0.5;"
" gl_FragColor = texture2D (tex, texturecoord);"
"}";