static void
st_scroll_view_fade_paint_target (ClutterOffscreenEffect *effect)
{
StScrollViewFade *self = ST_SCROLL_VIEW_FADE (effect);
ClutterOffscreenEffectClass *parent;
CoglHandle material;
gdouble value, lower, upper, page_size;
ClutterActor *vscroll = st_scroll_view_get_vscroll_bar (ST_SCROLL_VIEW (self->actor));
ClutterActor *hscroll = st_scroll_view_get_hscroll_bar (ST_SCROLL_VIEW (self->actor));
gboolean h_scroll_visible, v_scroll_visible;
g_object_get (ST_SCROLL_VIEW (self->actor),
"hscrollbar-visible", &h_scroll_visible,
"vscrollbar-visible", &v_scroll_visible,
NULL);
if (self->program == COGL_INVALID_HANDLE)
goto out;
st_adjustment_get_values (self->vadjustment, &value, &lower, &upper, NULL, NULL, &page_size);
if (self->offset_top_uniform > -1) {
if (value > lower + 0.1)
cogl_program_set_uniform_1f (self->program, self->offset_top_uniform, self->fade_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->fade_offset);
else
cogl_program_set_uniform_1f (self->program, self->offset_bottom_uniform, 0.0f);
}
if (self->tex_uniform > -1)
cogl_program_set_uniform_1i (self->program, self->tex_uniform, 0);
if (self->height_uniform > -1)
cogl_program_set_uniform_1f (self->program, self->height_uniform, clutter_actor_get_height (self->actor));
if (self->width_uniform > -1)
cogl_program_set_uniform_1f (self->program, self->width_uniform, clutter_actor_get_width (self->actor));
if (self->scrollbar_width_uniform > -1)
cogl_program_set_uniform_1f (self->program, self->scrollbar_width_uniform, v_scroll_visible ? clutter_actor_get_width (vscroll) : 0);
if (self->scrollbar_height_uniform > -1)
cogl_program_set_uniform_1f (self->program, self->scrollbar_height_uniform, h_scroll_visible ? clutter_actor_get_height (hscroll) : 0);
if (self->rtl_uniform > -1)
cogl_program_set_uniform_1i (self->program, self->rtl_uniform, (st_widget_get_direction (ST_WIDGET (self->actor)) == ST_TEXT_DIRECTION_RTL));
material = clutter_offscreen_effect_get_target (effect);
cogl_material_set_user_program (material, self->program);
out:
parent = CLUTTER_OFFSCREEN_EFFECT_CLASS (st_scroll_view_fade_parent_class);
parent->paint_target (effect);
}
static void
st_scroll_view_fade_paint_target (ClutterOffscreenEffect *effect)
{
StScrollViewFade *self = ST_SCROLL_VIEW_FADE (effect);
ClutterOffscreenEffectClass *parent;
CoglHandle material;
gdouble value, lower, upper, page_size;
ClutterActor *vscroll = st_scroll_view_get_vscroll_bar (ST_SCROLL_VIEW (self->actor));
ClutterActor *hscroll = st_scroll_view_get_hscroll_bar (ST_SCROLL_VIEW (self->actor));
gboolean h_scroll_visible, v_scroll_visible;
ClutterActorBox allocation, content_box, paint_box;
/*
* Used to pass the fade area to the shader
*
* [0][0] = x1
* [0][1] = y1
* [1][0] = x2
* [1][1] = y2
*
*/
float fade_area[2][2];
ClutterVertex verts[4];
if (self->program == COGL_INVALID_HANDLE)
goto out;
clutter_actor_get_paint_box (self->actor, &paint_box);
clutter_actor_get_abs_allocation_vertices (self->actor, verts);
clutter_actor_get_allocation_box (self->actor, &allocation);
st_theme_node_get_content_box (st_widget_get_theme_node (ST_WIDGET (self->actor)),
(const ClutterActorBox *)&allocation, &content_box);
/*
* The FBO is based on the paint_volume's size which can be larger then the actual
* allocation, so we have to account for that when passing the positions
*/
fade_area[0][0] = content_box.x1 + (verts[0].x - paint_box.x1);
fade_area[0][1] = content_box.y1 + (verts[0].y - paint_box.y1);
fade_area[1][0] = content_box.x2 + (verts[3].x - paint_box.x2);
fade_area[1][1] = content_box.y2 + (verts[3].y - paint_box.y2);
g_object_get (ST_SCROLL_VIEW (self->actor),
"hscrollbar-visible", &h_scroll_visible,
"vscrollbar-visible", &v_scroll_visible,
NULL);
if (v_scroll_visible)
{
if (st_widget_get_direction (ST_WIDGET (self->actor)) == ST_TEXT_DIRECTION_RTL)
fade_area[0][0] += clutter_actor_get_width (vscroll);
fade_area[1][0] -= clutter_actor_get_width (vscroll);
}
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->offset_top_uniform > -1) {
if (value > lower + 0.1)
cogl_program_set_uniform_1f (self->program, self->offset_top_uniform, self->fade_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->fade_offset);
else
cogl_program_set_uniform_1f (self->program, self->offset_bottom_uniform, 0.0f);
}
if (self->tex_uniform > -1)
cogl_program_set_uniform_1i (self->program, self->tex_uniform, 0);
if (self->height_uniform > -1)
cogl_program_set_uniform_1f (self->program, self->height_uniform, clutter_actor_get_height (self->actor));
if (self->width_uniform > -1)
cogl_program_set_uniform_1f (self->program, self->width_uniform, clutter_actor_get_width (self->actor));
if (self->fade_area_uniform > -1)
cogl_program_set_uniform_matrix (self->program, self->fade_area_uniform, 2, 1, FALSE, (const float *)fade_area);
material = clutter_offscreen_effect_get_target (effect);
cogl_material_set_user_program (material, self->program);
out:
parent = CLUTTER_OFFSCREEN_EFFECT_CLASS (st_scroll_view_fade_parent_class);
parent->paint_target (effect);
}
static void rc_set_shader(CoglHandle material, const RendererClutterShaderInfo *shaderInfo)
{
CoglHandle shader;
CoglHandle program;
gint uniform_no;
shader = cogl_create_shader (COGL_SHADER_TYPE_FRAGMENT);
cogl_shader_source (shader,
"vec3 checker(vec2 texc, vec3 color0, vec3 color1) \n"
"{ \n"
" if (mod(floor(texc.x) + floor(texc.y), 2.0) == 0.0) \n"
" return color0; \n"
" else \n"
" return color1; \n"
"} \n"
" \n"
"uniform sampler2D tex; \n"
"uniform sampler3D clut; \n"
"uniform float scale; \n"
"uniform float offset; \n"
"uniform float checkersize; \n"
"uniform vec3 color0; \n"
"uniform vec3 color1; \n"
" \n"
"void main(void) \n"
"{ \n"
" vec3 bg = checker(gl_FragCoord.xy / checkersize, color0, color1); \n"
" vec4 img4 = texture2D(tex, gl_TexCoord[0].xy); \n"
" vec3 img3 = img4.bgr; \n"
" img3 = img3 * scale + offset; \n"
" img3 = texture3D(clut, img3).rgb; \n"
" \n"
" gl_FragColor = vec4(img3 * img4.a + bg * (1.0 - img4.a), 1.0); \n"
"} \n"
);
cogl_shader_compile(shader);
gchar *err = cogl_shader_get_info_log(shader);
DEBUG_3("%s\n",err);
g_free(err);
program = cogl_create_program ();
cogl_program_attach_shader (program, shader);
cogl_handle_unref (shader);
cogl_program_link (program);
uniform_no = cogl_program_get_uniform_location (program, "tex");
cogl_program_set_uniform_1i (program, uniform_no, 0);
uniform_no = cogl_program_get_uniform_location (program, "clut");
cogl_program_set_uniform_1i (program, uniform_no, 1);
uniform_no = cogl_program_get_uniform_location (program, "scale");
cogl_program_set_uniform_1f (program, uniform_no, (double) (CLUT_SIZE - 1) / CLUT_SIZE);
uniform_no = cogl_program_get_uniform_location (program, "offset");
cogl_program_set_uniform_1f (program, uniform_no, 1.0 / (2 * CLUT_SIZE));
uniform_no = cogl_program_get_uniform_location (program, "checkersize");
cogl_program_set_uniform_1f (program, uniform_no, shaderInfo->checkersize);
uniform_no = cogl_program_get_uniform_location (program, "color0");
cogl_program_set_uniform_float (program, uniform_no, 3, 1, shaderInfo->checkercolor0);
uniform_no = cogl_program_get_uniform_location (program, "color1");
cogl_program_set_uniform_float (program, uniform_no, 3, 1, shaderInfo->checkercolor1);
cogl_material_set_user_program (material, program);
cogl_handle_unref (program);
}
