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background: Fix the desaturate effect when on its own

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We need to make sure cogl_texel is set to something,
otherwise we'll have junk.

https://bugzilla.gnome.org/show_bug.cgi?id=696087
This commit is contained in:
Jasper St. Pierre 2013-03-18 13:27:47 -04:00
parent 8a33880c00
commit e216b6ca0f
1 changed files with 6 additions and 1 deletions
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7
src/compositor/meta-background.c
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@ -63,6 +63,11 @@
" return vec3(mix(color.rgb, gray, 1.0 - saturation));\n" \
"}\n" \
/* Used when we don't have a blur, as the texel is going to be junk
* unless we set something to it. */
#define DESATURATE_PRELUDE \
"cogl_texel = texture2D(cogl_sampler, cogl_tex_coord.st);\n"
#define DESATURATE_CODE \
"cogl_texel.rgb = desaturate(cogl_texel.rgb);\n"
@ -621,7 +626,7 @@ add_texture_lookup_shader (MetaBackground *self)
else if (priv->effects & META_BACKGROUND_EFFECTS_BLUR)
code = BLUR_CODE;
else if (priv->effects & META_BACKGROUND_EFFECTS_DESATURATE)
code = DESATURATE_CODE;
code = DESATURATE_PRELUDE "\n" DESATURATE_CODE;
else
return;