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scroll-view-fade: Only calculate the ratios if they're needed

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This prevents some calculations being done for poor drivers with
bad optimizers.

https://bugzilla.gnome.org/show_bug.cgi?id=689249
This commit is contained in:
Jasper St. Pierre 2012-11-28 19:56:02 -05:00
parent 5c439f4e9c
commit 69347fff09
1 changed files with 4 additions and 8 deletions
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12
src/st/st-scroll-view-fade.glsl
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@ -52,29 +52,25 @@ void main ()
float ratio = 1.0;
float fade_bottom_start = fade_area[1][1] - vfade_offset;
float fade_right_start = fade_area[1][0] - hfade_offset;
float ratio_top = y / vfade_offset;
float ratio_bottom = (fade_area[1][1] - y)/(fade_area[1][1] - fade_bottom_start);
float ratio_left = x / hfade_offset;
float ratio_right = (fade_area[1][0] - x)/(fade_area[1][0] - fade_right_start);
bool fade_top = y < vfade_offset && vvalue > 0;
bool fade_bottom = y > fade_bottom_start && vvalue < 1;
bool fade_left = x < hfade_offset && hvalue > 0;
bool fade_right = x > fade_right_start && hvalue < 1;
if (fade_top) {
ratio *= ratio_top;
ratio *= (y / vfade_offset);
}
if (fade_bottom) {
ratio *= ratio_bottom;
ratio *= (fade_area[1][1] - y)/(fade_area[1][1] - fade_bottom_start);
}
if (fade_left) {
ratio *= ratio_left;
ratio *= (x / hfade_offset);
}
if (fade_right) {
ratio *= ratio_right;
ratio *= (fade_area[1][0] - x)/(fade_area[1][0] - fade_right_start);
}
cogl_color_out *= ratio;