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scroll-view-fade: Do the offset math in the shader

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This doesn't (or shouldn't) change the visual appearance of the fade
effect, but does do all the testing math inside the shader, rather
than on the CPU. This will make fading the offset much easier in
the future.

https://bugzilla.gnome.org/show_bug.cgi?id=689249
This commit is contained in:
Jasper St. Pierre
2012-11-28 16:51:42 -05:00
parent c84236ed73
commit 5c439f4e9c
2 changed files with 44 additions and 57 deletions
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76
src/st/st-scroll-view-fade.c
View File

@ -53,10 +53,10 @@ struct _StScrollViewFade
gint height_uniform;
gint width_uniform;
gint fade_area_uniform;
gint offset_top_uniform;
gint offset_bottom_uniform;
gint offset_left_uniform;
gint offset_right_uniform;
gint vfade_offset_uniform;
gint hfade_offset_uniform;
gint vvalue_uniform;
gint hvalue_uniform;
StAdjustment *vadjustment;
StAdjustment *hadjustment;
@ -121,14 +121,14 @@ st_scroll_view_fade_pre_paint (ClutterEffect *effect)
cogl_program_get_uniform_location (self->program, "width");
self->fade_area_uniform =
cogl_program_get_uniform_location (self->program, "fade_area");
self->offset_top_uniform =
cogl_program_get_uniform_location (self->program, "offset_top");
self->offset_bottom_uniform =
cogl_program_get_uniform_location (self->program, "offset_bottom");
self->offset_left_uniform =
cogl_program_get_uniform_location (self->program, "offset_left");
self->offset_right_uniform =
cogl_program_get_uniform_location (self->program, "offset_right");
self->vfade_offset_uniform =
cogl_program_get_uniform_location (self->program, "vfade_offset");
self->hfade_offset_uniform =
cogl_program_get_uniform_location (self->program, "hfade_offset");
self->vvalue_uniform =
cogl_program_get_uniform_location (self->program, "vvalue");
self->hvalue_uniform =
cogl_program_get_uniform_location (self->program, "hvalue");
}
parent_class = CLUTTER_EFFECT_CLASS (st_scroll_view_fade_parent_class);
@ -207,38 +207,24 @@ st_scroll_view_fade_paint_target (ClutterOffscreenEffect *effect)
if (h_scroll_visible)
fade_area[1][1] -= clutter_actor_get_height (hscroll);
st_adjustment_get_values (self->vadjustment, &value, &lower, &upper, NULL, NULL, &page_size);
if (self->vvalue_uniform > -1)
{
st_adjustment_get_values (self->vadjustment, &value, &lower, &upper, NULL, NULL, &page_size);
value = (value - lower) / (upper - page_size - lower);
cogl_program_set_uniform_1f (self->program, self->vvalue_uniform, value);
}
if (self->offset_top_uniform > -1) {
if (value > lower + 0.1)
cogl_program_set_uniform_1f (self->program, self->offset_top_uniform, self->vfade_offset);
else
cogl_program_set_uniform_1f (self->program, self->offset_top_uniform, 0.0f);
}
if (self->offset_bottom_uniform > -1) {
if (value < upper - page_size - 0.1)
cogl_program_set_uniform_1f (self->program, self->offset_bottom_uniform, self->vfade_offset);
else
cogl_program_set_uniform_1f (self->program, self->offset_bottom_uniform, 0.0f);
}
st_adjustment_get_values (self->hadjustment, &value, &lower, &upper, NULL, NULL, &page_size);
if (self->offset_left_uniform > -1) {
if (value > lower + 0.1)
cogl_program_set_uniform_1f (self->program, self->offset_left_uniform, self->hfade_offset);
else
cogl_program_set_uniform_1f (self->program, self->offset_left_uniform, 0.0f);
}
if (self->offset_right_uniform > -1) {
if (value < upper - page_size - 0.1)
cogl_program_set_uniform_1f (self->program, self->offset_right_uniform, self->hfade_offset);
else
cogl_program_set_uniform_1f (self->program, self->offset_right_uniform, 0.0f);
}
if (self->hvalue_uniform > -1)
{
st_adjustment_get_values (self->hadjustment, &value, &lower, &upper, NULL, NULL, &page_size);
value = (value - lower) / (upper - page_size - lower);
cogl_program_set_uniform_1f (self->program, self->hvalue_uniform, value);
}
if (self->vfade_offset_uniform > -1)
cogl_program_set_uniform_1f (self->program, self->vfade_offset_uniform, self->vfade_offset);
if (self->hfade_offset_uniform > -1)
cogl_program_set_uniform_1f (self->program, self->hfade_offset_uniform, self->hfade_offset);
if (self->tex_uniform > -1)
cogl_program_set_uniform_1i (self->program, self->tex_uniform, 0);
if (self->height_uniform > -1)
@ -517,8 +503,10 @@ st_scroll_view_fade_init (StScrollViewFade *self)
self->height_uniform = -1;
self->width_uniform = -1;
self->fade_area_uniform = -1;
self->offset_top_uniform = -1;
self->offset_bottom_uniform = -1;
self->vfade_offset_uniform = -1;
self->hfade_offset_uniform = -1;
self->vvalue_uniform = -1;
self->hvalue_uniform = -1;
self->vfade_offset = DEFAULT_FADE_OFFSET;
self->hfade_offset = DEFAULT_FADE_OFFSET;