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scroll-view-fade: Clean up GLSL

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Basic cleanup of what we're doing already. This moves a bunch
of the "inside the fade area" checks to the top, before doing
any calculations.

https://bugzilla.gnome.org/show_bug.cgi?id=689249
This commit is contained in:
Jasper St. Pierre 2012-11-28 16:51:37 -05:00
parent b3fea016f1
commit ae1a3a0cb2
1 changed files with 12 additions and 6 deletions
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18
src/st/st-scroll-view-fade.glsl
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@ -38,9 +38,15 @@ uniform mat2 fade_area;
void main ()
{
vec4 color = cogl_color_in * texture2D (tex, vec2 (cogl_tex_coord_in[0].xy));
cogl_color_out = cogl_color_in * texture2D (tex, vec2 (cogl_tex_coord_in[0].xy));
float y = height * cogl_tex_coord_in[0].y;
float x = width * cogl_tex_coord_in[0].x;
if (x < fade_area[0][0] || x > fade_area[1][0] ||
y < fade_area[0][1] || y > fade_area[1][1])
return;
float ratio = 1.0;
float fade_bottom_start = fade_area[1][1] - offset_bottom;
float fade_right_start = fade_area[1][0] - offset_right;
@ -49,10 +55,10 @@ void main ()
float ratio_left = x / offset_left;
float ratio_right = (fade_area[1][0] - x)/(fade_area[1][0] - fade_right_start);
bool in_scroll_area = fade_area[0][0] <= x && fade_area[1][0] >= x;
bool fade_top = y < offset_top && in_scroll_area && (y >= fade_area[0][1]);
bool fade_bottom = y > fade_bottom_start && in_scroll_area && (y <= fade_area[1][1]);
bool fade_left = x < offset_left && in_scroll_area && (x >= fade_area[0][0]);
bool fade_right = x > fade_right_start && in_scroll_area && (x <= fade_area[1][0]);
bool fade_top = y < offset_top;
bool fade_bottom = y > fade_bottom_start;
bool fade_left = x < offset_left;
bool fade_right = x > fade_right_start;
if (fade_top) {
ratio *= ratio_top;
@ -70,5 +76,5 @@ void main ()
ratio *= ratio_right;
}
cogl_color_out = color * ratio;
cogl_color_out *= ratio;
}