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/* OpenGL/Transitions
* #Keywords: OpenGL, shader
*
* Create transitions between pages using a custom fragment shader.
*
* The examples here are taken from gl-transitions.com.
*/
#include <math.h>
#include <gtk/gtk.h>
#include "gtkshaderstack.h"
static GtkWidget *demo_window = NULL;
static void
close_window (GtkWidget *widget)
{
/* Reset the state */
demo_window = NULL;
}
static GskGLShader *
gsk_shader_new_from_resource (const char *resource_path)
{
GBytes *shader_b;
GskGLShader *shader;
shader_b = g_resources_lookup_data (resource_path, 0, NULL);
shader = gsk_glshader_new ((const char *)g_bytes_get_data (shader_b, NULL));
g_bytes_unref (shader_b);
return shader;
}
static GtkWidget *
make_shader_stack (const char *resource_path)
{
GtkWidget *stack, *child;
GskGLShader *shader;
stack = gtk_shader_stack_new ();
shader = gsk_shader_new_from_resource (resource_path);
gtk_shader_stack_set_shader (GTK_SHADER_STACK (stack), shader);
g_object_unref (shader);
child = gtk_picture_new_for_resource ("/css_pixbufs/background.jpg");
gtk_picture_set_can_shrink (GTK_PICTURE (child), TRUE);
gtk_shader_stack_add_child (GTK_SHADER_STACK (stack), child);
child = gtk_picture_new_for_resource ("/transparent/portland-rose.jpg");
gtk_picture_set_can_shrink (GTK_PICTURE (child), TRUE);
gtk_shader_stack_add_child (GTK_SHADER_STACK (stack), child);
child = gtk_picture_new_for_resource ("/css_blendmodes/ducky.png");
gtk_picture_set_can_shrink (GTK_PICTURE (child), TRUE);
gtk_shader_stack_add_child (GTK_SHADER_STACK (stack), child);
return stack;
}
static GtkWidget *
create_gltransition_window (GtkWidget *do_widget)
{
GtkWidget *window, *grid;
window = gtk_window_new ();
gtk_window_set_display (GTK_WINDOW (window), gtk_widget_get_display (do_widget));
gtk_window_set_title (GTK_WINDOW (window), "Transitions");
gtk_window_set_default_size (GTK_WINDOW (window), 400, 400);
g_signal_connect (window, "destroy", G_CALLBACK (close_window), NULL);
grid = gtk_grid_new ();
gtk_widget_set_halign (grid, GTK_ALIGN_CENTER);
gtk_widget_set_valign (grid, GTK_ALIGN_CENTER);
gtk_widget_set_margin_start (grid, 12);
gtk_widget_set_margin_end (grid, 12);
gtk_widget_set_margin_top (grid, 12);
gtk_widget_set_margin_bottom (grid, 12);
gtk_grid_set_row_spacing (GTK_GRID (grid), 6);
gtk_grid_set_column_spacing (GTK_GRID (grid), 6);
gtk_grid_set_row_homogeneous (GTK_GRID (grid), TRUE);
gtk_grid_set_column_homogeneous (GTK_GRID (grid), TRUE);
gtk_window_set_child (GTK_WINDOW (window), grid);
gtk_grid_attach (GTK_GRID (grid),
make_shader_stack ("/gltransition/transition1.glsl"),
0, 0, 1, 1);
gtk_grid_attach (GTK_GRID (grid),
make_shader_stack ("/gltransition/transition2.glsl"),
1, 0, 1, 1);
gtk_grid_attach (GTK_GRID (grid),
make_shader_stack ("/gltransition/transition3.glsl"),
0, 1, 1, 1);
gtk_grid_attach (GTK_GRID (grid),
make_shader_stack ("/gltransition/transition4.glsl"),
1, 1, 1, 1);
return window;
}
GtkWidget *
do_gltransition (GtkWidget *do_widget)
{
if (!demo_window)
demo_window = create_gltransition_window (do_widget);
if (!gtk_widget_get_visible (demo_window))
gtk_widget_show (demo_window);
else
gtk_window_destroy (GTK_WINDOW (demo_window));
return demo_window;
}
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