Attachment 44454 Details for Bug 35257 – The shader in question before and after our suggestions

The shader in question before and after our suggestions

gnome_shell.fs (text/plain), 1.79 KB, created by Tom Stellard on 2011-03-14 17:29:19 UTC

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Creator: Tom Stellard

Created: 2011-03-14 17:29:19 UTC

Size: 1.79 KB

patch

obsolete

>BEFORE
>==================================
>uniform sampler2D tex;
>uniform float height;
>uniform float width;
>uniform float scrollbar_width;
>uniform float offset_bottom;
>uniform float offset_top;
>uniform bool rtl;
>
>void main ()
>{
> vec4 color = 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;
> float ratio = 0.0;
> float fade_bottom_start = height - offset_bottom;
> 
> if (offset_top != 0.0 && y < offset_top && ((rtl && x > scrollbar_width) || (!rtl && x < (width - scrollbar_width)))) {
>  ratio = y / offset_top;
>  cogl_color_out = color * ratio;
> }
> else if (offset_bottom != 0.0 && y > fade_bottom_start && ((rtl && x > scrollbar_width) || (!rtl && x < (width - scrollbar_width)))) {
>  ratio = (height - y)/(height - fade_bottom_start);
>  cogl_color_out = color * ratio;
> }
> else { 
>  cogl_color_out = color;
> }
>}
>================================
>AFTER
>===============================
>uniform sampler2D tex;
>uniform float height;
>uniform float width;
>uniform float scrollbar_width;
>uniform float offset_bottom;
>uniform float offset_top;
>uniform bool rtl;
>
>void main ()
>{
> vec4 color = 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;
> float ratio = 1.0;
> float fade_bottom_start = height - offset_bottom;
> float ratioA = y / offset_top;
> float ratioB = (height - y)/(height - fade_bottom_start);
> bool in_scroll_area = ((rtl && x > scrollbar_width) || (!rtl && x < (width - scrollbar_width)));
> bool fade_top = y < offset_top && in_scroll_area;
> bool fade_bottom = y > fade_bottom_start && in_scroll_area;
>	    
> if (fade_top) {
>  ratio = ratioA;
> }
> else if (fade_bottom) {
>  ratio = ratioB;
> }
> cogl_color_out = color * ratio;
>}

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Attachments on bug 35257: 44402 | 44403 | 44404 | 44454

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