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https://gitlab.gnome.org/GNOME/gtk.git
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32625381fa
The new renderers don't support them due to the required complexity of integrating them with Vulkan and the assumptions those nodes make about the renderer (the GL renderer exports its internal APIs into the GLShader). There haven't been any complaints that I'm aware of since 4.14 was released where the default renderer does not support the nodes, so usage in public seems to be close to nonexistant. The 2 uses I know of were workarounds about missing features in GTK that have stopped since GTK now supports them: 1. GStreamer used in to do premultiplication when the old GL renderer did not do so in hardware but on the CPU. 2. Adwaita used it for masking before the mask node wa added in 4.10.
366 lines
9.1 KiB
C
366 lines
9.1 KiB
C
#include "gtkshaderstack.h"
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G_GNUC_BEGIN_IGNORE_DEPRECATIONS
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struct _GtkShaderStack
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{
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GtkWidget parent_instance;
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GskGLShader *shader;
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GPtrArray *children;
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int current;
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int next;
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gboolean backwards;
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guint tick_id;
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float time;
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float duration;
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gint64 start_time;
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};
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struct _GtkShaderStackClass
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{
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GtkWidgetClass parent_class;
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};
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enum {
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PROP_DURATION = 1,
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NUM_PROPERTIES
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};
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static GParamSpec *properties[NUM_PROPERTIES] = { NULL };
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G_DEFINE_TYPE (GtkShaderStack, gtk_shader_stack, GTK_TYPE_WIDGET)
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static void
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gtk_shader_stack_finalize (GObject *object)
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{
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GtkShaderStack *self = GTK_SHADER_STACK (object);
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g_object_unref (self->shader);
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G_OBJECT_CLASS (gtk_shader_stack_parent_class)->finalize (object);
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}
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static void
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update_child_visible (GtkShaderStack *self)
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{
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int i;
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for (i = 0; i < self->children->len; i++)
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{
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GtkWidget *child = g_ptr_array_index (self->children, i);
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gtk_widget_set_child_visible (child,
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i == self->current || i == self->next);
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}
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}
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static gboolean
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transition_cb (GtkWidget *widget,
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GdkFrameClock *clock,
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gpointer unused)
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{
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GtkShaderStack *self = GTK_SHADER_STACK (widget);
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gint64 frame_time;
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frame_time = gdk_frame_clock_get_frame_time (clock);
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if (self->start_time == 0)
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self->start_time = frame_time;
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self->time = (frame_time - self->start_time) / (float)G_USEC_PER_SEC;
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gtk_widget_queue_draw (widget);
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if (self->time >= self->duration)
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{
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self->current = self->next;
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self->next = -1;
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update_child_visible (self);
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return G_SOURCE_REMOVE;
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}
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else
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return G_SOURCE_CONTINUE;
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}
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static void
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start_transition (GtkShaderStack *self)
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{
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self->start_time = 0;
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self->tick_id = gtk_widget_add_tick_callback (GTK_WIDGET (self),
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transition_cb,
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NULL, NULL);
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}
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static void
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stop_transition (GtkShaderStack *self)
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{
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if (self->tick_id != 0)
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{
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gtk_widget_remove_tick_callback (GTK_WIDGET (self), self->tick_id);
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self->tick_id = 0;
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}
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if (self->next != -1)
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self->current = self->next;
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self->next = -1;
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update_child_visible (self);
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}
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static void
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gtk_shader_stack_dispose (GObject *object)
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{
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GtkShaderStack *self = GTK_SHADER_STACK (object);
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stop_transition (self);
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g_clear_pointer (&self->children, g_ptr_array_unref);
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G_OBJECT_CLASS (gtk_shader_stack_parent_class)->dispose (object);
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}
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void
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gtk_shader_stack_transition (GtkShaderStack *self,
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gboolean forward)
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{
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stop_transition (self);
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self->backwards = !forward;
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if (self->backwards)
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self->next = (self->current + self->children->len - 1) % self->children->len;
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else
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self->next = (self->current + 1) % self->children->len;
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update_child_visible (self);
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start_transition (self);
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}
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static void
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gtk_shader_stack_init (GtkShaderStack *self)
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{
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self->children = g_ptr_array_new_with_free_func ((GDestroyNotify)gtk_widget_unparent);
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self->current = -1;
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self->next = -1;
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self->backwards = FALSE;
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self->duration = 1.0;
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}
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static void
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gtk_shader_stack_measure (GtkWidget *widget,
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GtkOrientation orientation,
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int for_size,
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int *minimum,
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int *natural,
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int *minimum_baseline,
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int *natural_baseline)
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{
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GtkShaderStack *self = GTK_SHADER_STACK (widget);
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int i;
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*minimum = 0;
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*natural = 0;
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for (i = 0; i < self->children->len; i++)
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{
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GtkWidget *child = g_ptr_array_index (self->children, i);
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int child_min, child_nat;
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if (gtk_widget_get_visible (child))
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{
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gtk_widget_measure (child, orientation, for_size, &child_min, &child_nat, NULL, NULL);
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*minimum = MAX (*minimum, child_min);
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*natural = MAX (*natural, child_nat);
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}
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}
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}
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static void
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gtk_shader_stack_size_allocate (GtkWidget *widget,
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int width,
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int height,
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int baseline)
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{
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GtkShaderStack *self = GTK_SHADER_STACK (widget);
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GtkAllocation child_allocation;
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GtkWidget *child;
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int i;
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child_allocation.x = 0;
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child_allocation.y = 0;
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child_allocation.width = width;
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child_allocation.height = height;
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for (i = 0; i < self->children->len; i++)
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{
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child = g_ptr_array_index (self->children, i);
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if (gtk_widget_get_visible (child))
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gtk_widget_size_allocate (child, &child_allocation, -1);
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}
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}
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static void
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gtk_shader_stack_snapshot (GtkWidget *widget,
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GtkSnapshot *snapshot)
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{
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GtkShaderStack *self = GTK_SHADER_STACK (widget);
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int width, height;
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GtkWidget *current, *next;
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width = gtk_widget_get_width (widget);
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height = gtk_widget_get_height (widget);
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current = g_ptr_array_index (self->children, self->current);
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if (self->next == -1)
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{
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gtk_widget_snapshot_child (widget, current, snapshot);
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}
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else
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{
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GtkNative *native = gtk_widget_get_native (widget);
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GskRenderer *renderer = gtk_native_get_renderer (native);
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float progress;
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next = g_ptr_array_index (self->children, self->next);
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progress = self->time / self->duration;
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if (self->backwards)
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{
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GtkWidget *tmp = next;
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next = current;
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current = tmp;
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progress = 1. - progress;
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}
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if (gsk_gl_shader_compile (self->shader, renderer, NULL))
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{
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gtk_snapshot_push_gl_shader (snapshot,
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self->shader,
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&GRAPHENE_RECT_INIT(0, 0, width, height),
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gsk_gl_shader_format_args (self->shader,
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"progress", progress,
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NULL));
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gtk_widget_snapshot_child (widget, current, snapshot);
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gtk_snapshot_gl_shader_pop_texture (snapshot); /* current child */
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gtk_widget_snapshot_child (widget, next, snapshot);
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gtk_snapshot_gl_shader_pop_texture (snapshot); /* next child */
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gtk_snapshot_pop (snapshot);
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}
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else
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{
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/* Non-shader fallback */
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gtk_widget_snapshot_child (widget, current, snapshot);
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}
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}
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}
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static void
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gtk_shader_stack_get_property (GObject *object,
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guint prop_id,
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GValue *value,
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GParamSpec *pspec)
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{
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GtkShaderStack *self = GTK_SHADER_STACK (object);
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switch (prop_id)
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{
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case PROP_DURATION:
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g_value_set_float (value, self->duration);
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break;
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default:
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G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
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break;
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}
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}
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static void
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gtk_shader_stack_set_property (GObject *object,
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guint prop_id,
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const GValue *value,
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GParamSpec *pspec)
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{
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GtkShaderStack *self = GTK_SHADER_STACK (object);
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switch (prop_id)
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{
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case PROP_DURATION:
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self->duration = g_value_get_float (value);
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break;
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default:
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G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
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break;
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}
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}
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static void
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gtk_shader_stack_class_init (GtkShaderStackClass *class)
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{
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GtkWidgetClass *widget_class = GTK_WIDGET_CLASS (class);
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GObjectClass *object_class = G_OBJECT_CLASS (class);
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object_class->finalize = gtk_shader_stack_finalize;
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object_class->dispose = gtk_shader_stack_dispose;
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object_class->get_property = gtk_shader_stack_get_property;
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object_class->set_property = gtk_shader_stack_set_property;
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widget_class->snapshot = gtk_shader_stack_snapshot;
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widget_class->measure = gtk_shader_stack_measure;
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widget_class->size_allocate = gtk_shader_stack_size_allocate;
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properties[PROP_DURATION] =
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g_param_spec_float ("duration", "Duration", "Duration",
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0.1, 3.0, 1.0,
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G_PARAM_READWRITE);
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g_object_class_install_properties (object_class, NUM_PROPERTIES, properties);
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}
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GtkWidget *
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gtk_shader_stack_new (void)
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{
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return g_object_new (GTK_TYPE_SHADER_STACK, NULL);
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}
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void
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gtk_shader_stack_set_shader (GtkShaderStack *self,
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GskGLShader *shader)
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{
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g_set_object (&self->shader, shader);
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}
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void
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gtk_shader_stack_add_child (GtkShaderStack *self,
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GtkWidget *child)
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{
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g_ptr_array_add (self->children, child);
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gtk_widget_set_parent (child, GTK_WIDGET (self));
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gtk_widget_queue_resize (GTK_WIDGET (self));
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if (self->current == -1)
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self->current = 0;
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else
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gtk_widget_set_child_visible (child, FALSE);
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}
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void
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gtk_shader_stack_set_active (GtkShaderStack *self,
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int index)
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{
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stop_transition (self);
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self->current = MIN (index, self->children->len);
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update_child_visible (self);
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}
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G_GNUC_END_IGNORE_DEPRECATIONS
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