[gtk: 12/15] gtk-demo: Add GskGLShaderNode demo
- From: Alexander Larsson <alexl src gnome org>
- To: commits-list gnome org
- Cc:
- Subject: [gtk: 12/15] gtk-demo: Add GskGLShaderNode demo
- Date: Tue, 29 Sep 2020 08:30:50 +0000 (UTC)
commit 8bcb031418a2676a2f64080ae74c51cd9e9fbf30
Author: Alexander Larsson <alexl redhat com>
Date: Mon Sep 21 21:05:04 2020 +0200
gtk-demo: Add GskGLShaderNode demo
Add adds a demo showing off GskGLShaderNode in various ways.
It has a transistion widget, using some examples from
gl-transitions.com, with child widgets being both images, a GL area
and real widgets (that let you edit the transition shaders
themselves.
It also has a fancy fire effect on hove on the buttons.
demos/gtk-demo/cogs2.glsl | 226 +++++++++++++++++++++++
demos/gtk-demo/demo.gresource.xml | 13 ++
demos/gtk-demo/fire.glsl | 72 ++++++++
demos/gtk-demo/gltransition.c | 329 +++++++++++++++++++++++++++++++++
demos/gtk-demo/gskshaderpaintable.c | 337 ++++++++++++++++++++++++++++++++++
demos/gtk-demo/gskshaderpaintable.h | 53 ++++++
demos/gtk-demo/gtkshaderbin.c | 241 ++++++++++++++++++++++++
demos/gtk-demo/gtkshaderbin.h | 22 +++
demos/gtk-demo/gtkshaderstack.c | 352 ++++++++++++++++++++++++++++++++++++
demos/gtk-demo/gtkshaderstack.h | 21 +++
demos/gtk-demo/meson.build | 4 +
demos/gtk-demo/transition1.glsl | 33 ++++
demos/gtk-demo/transition2.glsl | 34 ++++
demos/gtk-demo/transition3.glsl | 27 +++
demos/gtk-demo/transition4.glsl | 41 +++++
15 files changed, 1805 insertions(+)
---
diff --git a/demos/gtk-demo/cogs2.glsl b/demos/gtk-demo/cogs2.glsl
new file mode 100644
index 0000000000..8d131eca8d
--- /dev/null
+++ b/demos/gtk-demo/cogs2.glsl
@@ -0,0 +1,226 @@
+uniform float iTime;
+
+// Originally from: https://www.shadertoy.com/view/3ljyDD
+// License CC0: Hexagonal tiling + cog wheels
+// Nothing fancy, just hexagonal tiling + cog wheels
+
+#define PI 3.141592654
+#define TAU (2.0*PI)
+#define MROT(a) mat2(cos(a), sin(a), -sin(a), cos(a))
+
+float hash(in vec2 co) {
+ return fract(sin(dot(co.xy ,vec2(12.9898,58.233))) * 13758.5453);
+}
+
+float pcos(float a) {
+ return 0.5 + 0.5*cos(a);
+}
+
+void rot(inout vec2 p, float a) {
+ float c = cos(a);
+ float s = sin(a);
+ p = vec2(c*p.x + s*p.y, -s*p.x + c*p.y);
+}
+
+float modPolar(inout vec2 p, float repetitions) {
+ float angle = 2.0*PI/repetitions;
+ float a = atan(p.y, p.x) + angle/2.;
+ float r = length(p);
+ float c = floor(a/angle);
+ a = mod(a,angle) - angle/2.;
+ p = vec2(cos(a), sin(a))*r;
+ // For an odd number of repetitions, fix cell index of the cell in -x direction
+ // (cell index would be e.g. -5 and 5 in the two halves of the cell):
+ if (abs(c) >= (repetitions/2.0)) c = abs(c);
+ return c;
+}
+
+float pmin(float a, float b, float k) {
+ float h = clamp( 0.5+0.5*(b-a)/k, 0.0, 1.0 );
+ return mix( b, a, h ) - k*h*(1.0-h);
+}
+
+const vec2 sz = vec2(1.0, sqrt(3.0));
+const vec2 hsz = 0.5*sz;
+const float smallCount = 16.0;
+
+vec2 hextile(inout vec2 p) {
+ // See Art of Code: Hexagonal Tiling Explained!
+ // https://www.youtube.com/watch?v=VmrIDyYiJBA
+
+ vec2 p1 = mod(p, sz)-hsz;
+ vec2 p2 = mod(p - hsz*1.0, sz)-hsz;
+ vec2 p3 = mix(p2, p1, vec2(length(p1) < length(p2)));
+ vec2 n = p3 - p;
+ p = p3;
+
+ return n;
+}
+
+float circle(vec2 p, float r) {
+ return length(p) - r;
+}
+
+float box(vec2 p, vec2 b) {
+ vec2 d = abs(p)-b;
+ return length(max(d,0.0)) + min(max(d.x,d.y),0.0);
+}
+
+float unevenCapsule(vec2 p, float r1, float r2, float h) {
+ p.x = abs(p.x);
+ float b = (r1-r2)/h;
+ float a = sqrt(1.0-b*b);
+ float k = dot(p,vec2(-b,a));
+ if( k < 0.0 ) return length(p) - r1;
+ if( k > a*h ) return length(p-vec2(0.0,h)) - r2;
+ return dot(p, vec2(a,b) ) - r1;
+}
+
+float cogwheel(vec2 p, float innerRadius, float outerRadius, float cogs, float holes) {
+ float cogWidth = 0.25*innerRadius*TAU/cogs;
+
+ float d0 = circle(p, innerRadius);
+
+ vec2 icp = p;
+ modPolar(icp, holes);
+ icp -= vec2(innerRadius*0.55, 0.0);
+ float d1 = circle(icp, innerRadius*0.25);
+
+ vec2 cp = p;
+ modPolar(cp, cogs);
+ cp -= vec2(innerRadius, 0.0);
+ float d2 = unevenCapsule(cp.yx, cogWidth, cogWidth*0.75, (outerRadius-innerRadius));
+
+ float d3 = circle(p, innerRadius*0.20);
+
+ float d = 1E6;
+ d = min(d, d0);
+ d = pmin(d, d2, 0.5*cogWidth);
+ d = min(d, d2);
+ d = max(d, -d1);
+ d = max(d, -d3);
+
+ return d;
+}
+
+float ccell1(vec2 p, float r) {
+ float d = 1E6;
+ const float bigCount = 60.0;
+
+ vec2 cp0 = p;
+ rot(cp0, -iTime*TAU/bigCount);
+ float d0 = cogwheel(cp0, 0.36, 0.38, bigCount, 5.0);
+
+ vec2 cp1 = p;
+ float nm = modPolar(cp1, 6.0);
+
+ cp1 -= vec2(0.5, 0.0);
+ rot(cp1, 0.2+TAU*nm/2.0 + iTime*TAU/smallCount);
+ float d1 = cogwheel(cp1, 0.11, 0.125, smallCount, 5.0);
+
+ d = min(d, d0);
+ d = min(d, d1);
+ return d;
+}
+
+float ccell2(vec2 p, float r) {
+ float d = 1E6;
+ vec2 cp0 = p;
+ float nm = modPolar(cp0, 6.0);
+ vec2 cp1 = cp0;
+ const float off = 0.275;
+ const float count = smallCount + 2.0;
+ cp0 -= vec2(off, 0.0);
+ rot(cp0, 0.+TAU*nm/2.0 - iTime*TAU/count);
+ float d0 = cogwheel(cp0, 0.09, 0.105, count, 5.0);
+
+
+ cp1 -= vec2(0.5, 0.0);
+ rot(cp1, 0.2+TAU*nm/2.0 + iTime*TAU/smallCount);
+ float d1 = cogwheel(cp1, 0.11, 0.125, smallCount, 5.0);
+
+ float l = length(p);
+ float d2 = l - (off+0.055);
+ float d3 = d2 + 0.020;;
+
+ vec2 tp0 = p;
+ modPolar(tp0, 60.0);
+ tp0.x -= off;
+ float d4 = box(tp0, vec2(0.0125, 0.005));
+
+ float ctime = -(iTime*0.05 + r)*TAU;
+
+ vec2 tp1 = p;
+ rot(tp1, ctime*12.0);
+ tp1.x -= 0.13;
+ float d5 = box(tp1, vec2(0.125, 0.005));
+
+ vec2 tp2 = p;
+ rot(tp2, ctime);
+ tp2.x -= 0.13*0.5;
+ float d6 = box(tp2, vec2(0.125*0.5, 0.0075));
+
+ float d7 = l - 0.025;
+ float d8 = l - 0.0125;
+
+ d = min(d, d0);
+ d = min(d, d1);
+ d = min(d, d2);
+ d = max(d, -d3);
+ d = min(d, d4);
+ d = min(d, d5);
+ d = min(d, d6);
+ d = min(d, d7);
+ d = max(d, -d8);
+
+ return d;
+}
+
+float df(vec2 p, float scale, inout vec2 nn) {
+ p /= scale;
+ nn = hextile(p);
+ nn = round(nn);
+ float r = hash(nn);
+
+ float d;;
+
+ if (r < 0.5) {
+ d = ccell1(p, r);
+ } else {
+ d = ccell2(p, r);
+ }
+
+ return d*scale;
+}
+
+vec3 postProcess(vec3 col, vec2 q) {
+ //col = saturate(col);
+ col=pow(clamp(col,0.0,1.0),vec3(0.75));
+ col=col*0.6+0.4*col*col*(3.0-2.0*col); // contrast
+ col=mix(col, vec3(dot(col, vec3(0.33))), -0.4); // satuation
+ col*=0.5+0.5*pow(19.0*q.x*q.y*(1.0-q.x)*(1.0-q.y),0.7); // vigneting
+ return col;
+}
+
+void mainImage(out vec4 fragColor, in vec2 fragCoord, in vec2 resolution, in vec2 uv) {
+ vec2 q = fragCoord/resolution.xy;
+ vec2 p = -1.0 + 2.0*q;
+ p.x *= resolution.x/resolution.y;
+ float tm = iTime*0.1;
+ p += vec2(cos(tm), sin(tm*sqrt(0.5)));
+ float z = mix(0.5, 1.0, pcos(tm*sqrt(0.3)));
+ float aa = 4.0 / resolution.y;
+
+ vec2 nn = vec2(0.0);
+ float d = df(p, z, nn);
+
+ vec3 col = vec3(160.0)/vec3(255.0);
+ vec3 baseCol = vec3(0.3);
+ vec4 logoCol = vec4(baseCol, 1.0)*smoothstep(-aa, 0.0, -d);
+ col = mix(col, logoCol.xyz, pow(logoCol.w, 8.0));
+ col += 0.4*pow(abs(sin(20.0*d)), 0.6);
+
+ col = postProcess(col, q);
+
+ fragColor = vec4(col, 1.0);
+}
diff --git a/demos/gtk-demo/demo.gresource.xml b/demos/gtk-demo/demo.gresource.xml
index 39d6ad2db8..cc9727481c 100644
--- a/demos/gtk-demo/demo.gresource.xml
+++ b/demos/gtk-demo/demo.gresource.xml
@@ -133,6 +133,18 @@
<file>cogs.glsl</file>
<file>glowingstars.glsl</file>
</gresource>
+ <gresource prefix="/gltransition">
+ <file>gtkshaderstack.c</file>
+ <file>gtkshaderstack.h</file>
+ <file>gtkshaderbin.h</file>
+ <file>gtkshaderbin.c</file>
+ <file>fire.glsl</file>
+ <file>transition1.glsl</file>
+ <file>transition2.glsl</file>
+ <file>transition3.glsl</file>
+ <file>transition4.glsl</file>
+ <file>cogs2.glsl</file>
+ </gresource>
<gresource prefix="/iconscroll">
<file>iconscroll.ui</file>
</gresource>
@@ -247,6 +259,7 @@
<file>gears.c</file>
<file>gestures.c</file>
<file>glarea.c</file>
+ <file>gltransition.c</file>
<file>headerbar.c</file>
<file>hypertext.c</file>
<file>iconscroll.c</file>
diff --git a/demos/gtk-demo/fire.glsl b/demos/gtk-demo/fire.glsl
new file mode 100644
index 0000000000..e62fe1bd39
--- /dev/null
+++ b/demos/gtk-demo/fire.glsl
@@ -0,0 +1,72 @@
+uniform float u_time;
+uniform sampler2D u_texture1;
+
+/* 2D -> [0..1] random number generator */
+float random(vec2 st) {
+ return fract(sin(dot(st.xy,
+ vec2(12.9898,78.233))) *
+ 43758.5453123);
+}
+
+/* Generate a smoothed 2d noise based on random() */
+float noise(vec2 v) {
+ /* Round point v to integer grid grid */
+ vec2 grid_point = floor(v);
+ /* Randomize in grid corners */
+ float corner1 = random(grid_point);
+ float corner2 = random(grid_point + vec2(1, 0));
+ float corner3 = random(grid_point + vec2(0, 1));
+ float corner4 = random(grid_point + vec2(1, 1));
+ /* Interpolate smoothly between grid points */
+ vec2 fraction = smoothstep(vec2(0.0), vec2(1.0), fract(v));
+ return mix(mix(corner1, corner2, fraction.x),
+ mix(corner3, corner4, fraction.x),
+ fraction.y);
+}
+
+/* fractal brownian motion noice, see https://www.iquilezles.org/www/articles/fbm/fbm.htm */
+float fbm(in vec2 x)
+{
+ const float octaveScale = 1.9;
+ const float G = 0.5;
+ float f = 1.0;
+ float a = 1.0;
+ float t = 0.0;
+ int numOctaves = 5;
+ for (int i = 0; i < numOctaves; i++) {
+ t += a*noise(f*x);
+ f *= octaveScale;
+ a *= G;
+ }
+
+ return t;
+}
+
+void mainImage(out vec4 fragColor, in vec2 fragCoord, in vec2 resolution, in vec2 uv)
+{
+ vec2 xy = fragCoord / resolution;
+
+ float zoom = 3.0 - sin(u_time*0.5)*0.3;
+
+ // Normalize coord to height of widget
+ vec2 p = (vec2 (-resolution.x/2.0 + fragCoord.x, resolution.y - fragCoord.y) / resolution.yy)* zoom;
+
+ // Use recursive incantations of fbm
+ float q1 = fbm(p - vec2(0.8, 0.3) * u_time);
+ float q2 = fbm(p - vec2(0.5, 1.3) * u_time);
+ float r = fbm(2.0*p + vec2(q1,q2) - vec2(0.0, 1.0)*u_time*10.0 *0.4);
+
+ // Compute intensity, mostly on the bottom
+ float w = 2.0 * r * p.y;
+
+ // Smooth out left/right side and fade in at start
+ w /= smoothstep(0.0,0.1, xy.x)* smoothstep(0.0,0.1, 1.0-xy.x) * smoothstep(0.0,0.4, u_time);
+
+ // Compute colors
+ vec3 c = vec3(1.0,.2,.05);
+ vec3 color = 1.0 / (w*w/c + 1.0);
+
+ // Mix in widget
+ vec4 widget = GskTexture(u_texture1,uv);
+ fragColor = gsk_premultiply(mix(vec4(color,1), widget, 1.0-color.x));
+}
diff --git a/demos/gtk-demo/gltransition.c b/demos/gtk-demo/gltransition.c
new file mode 100644
index 0000000000..24b6f96f30
--- /dev/null
+++ b/demos/gtk-demo/gltransition.c
@@ -0,0 +1,329 @@
+/* OpenGL/Transitions
+ * #Keywords: OpenGL, shader
+ *
+ * Create transitions between pages using a custom fragment shader.
+ *
+ * The example transitions here are taken from gl-transitions.com, and you
+ * can edit the shader code itself on the last page of the stack.
+ *
+ * The transitions work with arbitrary content. We use images, shaders
+ * GL areas and plain old widgets to demonstrate this.
+ *
+ * The demo also shows some sample fire effects on the buttons.
+ */
+
+#include <math.h>
+#include <gtk/gtk.h>
+#include "gtkshaderstack.h"
+#include "gtkshaderbin.h"
+#include "gtkshadertoy.h"
+#include "gskshaderpaintable.h"
+
+static GtkWidget *demo_window = NULL;
+
+static void
+close_window (GtkWidget *widget)
+{
+ /* Reset the state */
+ demo_window = NULL;
+}
+
+static void
+text_changed (GtkTextBuffer *buffer,
+ GtkWidget *button)
+{
+ gtk_widget_show (button);
+}
+
+static void
+apply_text (GtkWidget *button,
+ GtkTextBuffer *buffer)
+{
+ GtkWidget *stack;
+ GskGLShader *shader;
+ GtkTextIter start, end;
+ char *text;
+
+ stack = g_object_get_data (G_OBJECT (button), "the-stack");
+
+ gtk_text_buffer_get_bounds (buffer, &start, &end);
+ text = gtk_text_buffer_get_text (buffer, &start, &end, TRUE);
+
+ GBytes *bytes = g_bytes_new_take (text, strlen (text));
+ shader = gsk_gl_shader_new_from_bytes (bytes);
+
+ gtk_shader_stack_set_shader (GTK_SHADER_STACK (stack), shader);
+
+ g_object_unref (shader);
+ g_bytes_unref (bytes);
+
+ gtk_widget_hide (button);
+}
+
+static void
+go_back (GtkWidget *button,
+ GtkWidget *stack)
+{
+ gtk_shader_stack_transition (GTK_SHADER_STACK (stack), FALSE);
+}
+
+static void
+go_forward (GtkWidget *button,
+ GtkWidget *stack)
+{
+ gtk_shader_stack_transition (GTK_SHADER_STACK (stack), TRUE);
+}
+
+static void
+clicked_cb (GtkGestureClick *gesture,
+ guint n_pressed,
+ double x,
+ double y,
+ gpointer data)
+{
+ gtk_gesture_set_state (GTK_GESTURE (gesture), GTK_EVENT_SEQUENCE_CLAIMED);
+}
+
+static GtkWidget *
+fire_bin_new (void)
+{
+ GtkWidget *bin = gtk_shader_bin_new ();
+ static GskGLShader *shader = NULL;
+
+ if (shader == NULL)
+ shader = gsk_gl_shader_new_from_resource ("/gltransition/fire.glsl");
+
+ gtk_shader_bin_add_shader (GTK_SHADER_BIN (bin), shader, GTK_STATE_FLAG_PRELIGHT, GTK_STATE_FLAG_PRELIGHT);
+
+ return bin;
+}
+
+static GtkWidget *
+new_shadertoy (const char *path)
+{
+ GBytes *shader;
+ GtkWidget *toy;
+
+ toy = gtk_shadertoy_new ();
+ shader = g_resources_lookup_data (path, 0, NULL);
+ gtk_shadertoy_set_image_shader (GTK_SHADERTOY (toy),
+ g_bytes_get_data (shader, NULL));
+ g_bytes_unref (shader);
+
+ return toy;
+}
+
+static gboolean
+update_paintable (GtkWidget *widget,
+ GdkFrameClock *frame_clock,
+ gpointer user_data)
+{
+ GskShaderPaintable *paintable;
+ gint64 frame_time;
+
+ paintable = GSK_SHADER_PAINTABLE (gtk_picture_get_paintable (GTK_PICTURE (widget)));
+ frame_time = gdk_frame_clock_get_frame_time (frame_clock);
+ gsk_shader_paintable_update_time (paintable, 0, frame_time);
+
+ return G_SOURCE_CONTINUE;
+}
+
+static GtkWidget *
+make_shader_stack (const char *name,
+ const char *resource_path,
+ GtkWidget *scale)
+{
+ GtkWidget *stack, *child, *widget, *vbox, *hbox, *bin;
+ GtkWidget *label, *button, *tv;
+ GskGLShader *shader;
+ GObjectClass *class;
+ GParamSpecFloat *pspec;
+ GtkAdjustment *adjustment;
+ GtkTextBuffer *buffer;
+ GBytes *bytes;
+ GtkEventController *controller;
+ GtkCssProvider *provider;
+ GdkPaintable *paintable;
+
+ stack = gtk_shader_stack_new ();
+ shader = gsk_gl_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);
+
+ shader = gsk_gl_shader_new_from_resource ("/gltransition/cogs2.glsl");
+ paintable = gsk_shader_paintable_new (shader, NULL);
+
+ child = gtk_picture_new_for_paintable (paintable);
+ gtk_widget_add_tick_callback (child, update_paintable, NULL, NULL);
+ 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 = new_shadertoy ("/shadertoy/neon.glsl");
+ gtk_shader_stack_add_child (GTK_SHADER_STACK (stack), child);
+
+ child = gtk_box_new (GTK_ORIENTATION_VERTICAL, 6);
+
+ class = g_type_class_ref (GTK_TYPE_SHADER_STACK);
+ pspec = G_PARAM_SPEC_FLOAT (g_object_class_find_property (class, "duration"));
+
+ adjustment = gtk_range_get_adjustment (GTK_RANGE (scale));
+ if (gtk_adjustment_get_lower (adjustment) == 0.0 &&
+ gtk_adjustment_get_upper (adjustment) == 0.0)
+ {
+ gtk_adjustment_configure (adjustment,
+ pspec->default_value,
+ pspec->minimum,
+ pspec->maximum,
+ 0.1, 0.5, 0);
+ }
+
+ g_type_class_unref (class);
+
+ g_object_bind_property (adjustment, "value",
+ stack, "duration",
+ G_BINDING_DEFAULT);
+
+ widget = gtk_scrolled_window_new ();
+ gtk_scrolled_window_set_has_frame (GTK_SCROLLED_WINDOW (widget), TRUE);
+ gtk_widget_set_hexpand (widget, TRUE);
+ gtk_widget_set_vexpand (widget, TRUE);
+
+ controller = GTK_EVENT_CONTROLLER (gtk_gesture_click_new ());
+ gtk_gesture_single_set_button (GTK_GESTURE_SINGLE (controller), 0);
+ g_signal_connect (controller, "released", G_CALLBACK (clicked_cb), NULL);
+ gtk_event_controller_set_propagation_phase (controller, GTK_PHASE_BUBBLE);
+ gtk_widget_add_controller (GTK_WIDGET (widget), controller);
+
+ tv = gtk_text_view_new ();
+ gtk_text_view_set_left_margin (GTK_TEXT_VIEW (tv), 4);
+ gtk_text_view_set_right_margin (GTK_TEXT_VIEW (tv), 4);
+ gtk_text_view_set_top_margin (GTK_TEXT_VIEW (tv), 4);
+ gtk_text_view_set_bottom_margin (GTK_TEXT_VIEW (tv), 4);
+ buffer = gtk_text_view_get_buffer (GTK_TEXT_VIEW (tv));
+ bytes = g_resources_lookup_data (resource_path, 0, NULL);
+ gtk_text_buffer_set_text (buffer,
+ (const char *)g_bytes_get_data (bytes, NULL),
+ g_bytes_get_size (bytes));
+ g_bytes_unref (bytes);
+ gtk_scrolled_window_set_child (GTK_SCROLLED_WINDOW (widget), tv);
+
+ gtk_box_append (GTK_BOX (child), widget);
+
+ gtk_shader_stack_add_child (GTK_SHADER_STACK (stack), child);
+
+ vbox = gtk_box_new (GTK_ORIENTATION_VERTICAL, 6);
+
+ widget = gtk_center_box_new ();
+ label = gtk_label_new (name);
+ gtk_widget_add_css_class (label, "title-4");
+ gtk_widget_set_size_request (label, -1, 26);
+ gtk_center_box_set_center_widget (GTK_CENTER_BOX (widget), label);
+
+ button = gtk_button_new_from_icon_name ("view-refresh-symbolic");
+ g_signal_connect (buffer, "changed", G_CALLBACK (text_changed), button);
+ g_object_set_data (G_OBJECT (button), "the-stack", stack);
+ g_signal_connect (button, "clicked", G_CALLBACK (apply_text), buffer);
+ provider = gtk_css_provider_new ();
+ gtk_css_provider_load_from_data (provider, "button.small { padding: 0; }", -1);
+ gtk_style_context_add_provider (gtk_widget_get_style_context (button),
+ GTK_STYLE_PROVIDER (provider),
+ GTK_STYLE_PROVIDER_PRIORITY_APPLICATION);
+ g_object_unref (provider);
+ gtk_widget_set_halign (button, GTK_ALIGN_CENTER);
+ gtk_widget_set_valign (button, GTK_ALIGN_CENTER);
+ gtk_widget_add_css_class (button, "small");
+ gtk_widget_hide (button);
+ gtk_center_box_set_end_widget (GTK_CENTER_BOX (widget), button);
+
+ gtk_box_append (GTK_BOX (vbox), widget);
+
+ gtk_box_append (GTK_BOX (vbox), stack);
+
+ hbox = gtk_box_new (GTK_ORIENTATION_HORIZONTAL, 6);
+ gtk_widget_set_halign (hbox, GTK_ALIGN_CENTER);
+
+ gtk_box_append (GTK_BOX (vbox), hbox);
+
+ button = gtk_button_new_from_icon_name ("go-previous");
+ g_signal_connect (button, "clicked", G_CALLBACK (go_back), stack);
+ bin = fire_bin_new ();
+ gtk_shader_bin_set_child (GTK_SHADER_BIN (bin), button);
+ gtk_box_append (GTK_BOX (hbox), bin);
+
+ button = gtk_button_new_from_icon_name ("go-next");
+ g_signal_connect (button, "clicked", G_CALLBACK (go_forward), stack);
+ bin = fire_bin_new ();
+ gtk_shader_bin_set_child (GTK_SHADER_BIN (bin), button);
+ gtk_box_append (GTK_BOX (hbox), bin);
+
+ return vbox;
+}
+
+static GtkWidget *
+create_gltransition_window (GtkWidget *do_widget)
+{
+ GtkWidget *window, *headerbar, *scale, *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");
+ headerbar = gtk_header_bar_new ();
+ scale = gtk_scale_new (GTK_ORIENTATION_HORIZONTAL, NULL);
+ gtk_scale_set_draw_value (GTK_SCALE (scale), FALSE);
+ gtk_widget_set_size_request (scale, 100, -1);
+ gtk_header_bar_pack_end (GTK_HEADER_BAR (headerbar), scale);
+ gtk_window_set_titlebar (GTK_WINDOW (window), headerbar);
+ gtk_window_set_default_size (GTK_WINDOW (window), 800, 600);
+ g_signal_connect (window, "destroy", G_CALLBACK (close_window), NULL);
+
+ grid = gtk_grid_new ();
+ gtk_window_set_child (GTK_WINDOW (window), grid);
+
+ 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_grid_attach (GTK_GRID (grid),
+ make_shader_stack ("Wind", "/gltransition/transition1.glsl", scale),
+ 0, 0, 1, 1);
+ gtk_grid_attach (GTK_GRID (grid),
+ make_shader_stack ("Radial", "/gltransition/transition2.glsl", scale),
+ 1, 0, 1, 1);
+ gtk_grid_attach (GTK_GRID (grid),
+ make_shader_stack ("Crosswarp", "/gltransition/transition3.glsl", scale),
+ 0, 1, 1, 1);
+ gtk_grid_attach (GTK_GRID (grid),
+ make_shader_stack ("Kaleidoscope", "/gltransition/transition4.glsl", scale),
+ 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;
+}
diff --git a/demos/gtk-demo/gskshaderpaintable.c b/demos/gtk-demo/gskshaderpaintable.c
new file mode 100644
index 0000000000..3eb0cbc89f
--- /dev/null
+++ b/demos/gtk-demo/gskshaderpaintable.c
@@ -0,0 +1,337 @@
+/*
+ * Copyright © 2020 Red Hat, Inc
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library. If not, see <http://www.gnu.org/licenses/>.
+ *
+ * Authors: Matthias Clasen <mclasen redhat com>
+ */
+
+#include "config.h"
+
+#include <gtk/gtk.h>
+#include "gskshaderpaintable.h"
+
+/**
+ * SECTION:gskshaderpaintable
+ * @Short_description: Drawing with shaders
+ * @Title: GskShaderPaintable
+ * @see_also: #GdkPaintable
+ *
+ * GskShaderPaintable is an implementation of the #GdkPaintable interface
+ * that uses a #GskGLShader to create pixels.
+ *
+ * You can set the uniform data that the shader needs for rendering
+ * using gsk_shader_paintable_set_args(). This function can
+ * be called repeatedly to change the uniform data for the next
+ * snapshot.
+ *
+ * Commonly, time is passed to shaders as a float uniform containing
+ * the elapsed time in seconds. The convenience API
+ * gsk_shader_paintable_update_time() can be called from a #GtkTickCallback
+ * to update the time based on the frame time of the frame clock.
+ */
+
+
+struct _GskShaderPaintable
+{
+ GObject parent_instance;
+
+ GskGLShader *shader;
+ GBytes *args;
+
+ gint64 start_time;
+};
+
+struct _GskShaderPaintableClass
+{
+ GObjectClass parent_class;
+};
+
+enum {
+ PROP_0,
+ PROP_SHADER,
+ PROP_ARGS,
+
+ N_PROPS,
+};
+
+static GParamSpec *properties[N_PROPS] = { NULL, };
+
+static void
+gsk_shader_paintable_paintable_snapshot (GdkPaintable *paintable,
+ GdkSnapshot *snapshot,
+ double width,
+ double height)
+{
+ GskShaderPaintable *self = GSK_SHADER_PAINTABLE (paintable);
+
+ gtk_snapshot_push_gl_shader (snapshot, self->shader, &GRAPHENE_RECT_INIT(0, 0, width, height), g_bytes_ref
(self->args));
+ gtk_snapshot_pop (snapshot);
+}
+
+static void
+gsk_shader_paintable_paintable_init (GdkPaintableInterface *iface)
+{
+ iface->snapshot = gsk_shader_paintable_paintable_snapshot;
+}
+
+G_DEFINE_TYPE_EXTENDED (GskShaderPaintable, gsk_shader_paintable, G_TYPE_OBJECT, 0,
+ G_IMPLEMENT_INTERFACE (GDK_TYPE_PAINTABLE,
+ gsk_shader_paintable_paintable_init))
+
+static void
+gsk_shader_paintable_set_property (GObject *object,
+ guint prop_id,
+ const GValue *value,
+ GParamSpec *pspec)
+
+{
+ GskShaderPaintable *self = GSK_SHADER_PAINTABLE (object);
+
+ switch (prop_id)
+ {
+ case PROP_SHADER:
+ gsk_shader_paintable_set_shader (self, g_value_get_object (value));
+ break;
+
+ case PROP_ARGS:
+ gsk_shader_paintable_set_args (self, g_value_get_boxed (value));
+ break;
+
+ default:
+ G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
+ break;
+ }
+}
+
+static void
+gsk_shader_paintable_get_property (GObject *object,
+ guint prop_id,
+ GValue *value,
+ GParamSpec *pspec)
+{
+ GskShaderPaintable *self = GSK_SHADER_PAINTABLE (object);
+
+ switch (prop_id)
+ {
+ case PROP_SHADER:
+ g_value_set_object (value, self->shader);
+ break;
+
+ case PROP_ARGS:
+ g_value_set_boxed (value, self->args);
+ break;
+
+ default:
+ G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
+ break;
+ }
+}
+
+static void
+gsk_shader_paintable_finalize (GObject *object)
+{
+ GskShaderPaintable *self = GSK_SHADER_PAINTABLE (object);
+
+ g_clear_pointer (&self->args, g_bytes_unref);
+ g_clear_object (&self->shader);
+
+ G_OBJECT_CLASS (gsk_shader_paintable_parent_class)->finalize (object);
+}
+
+static void
+gsk_shader_paintable_class_init (GskShaderPaintableClass *klass)
+{
+ GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
+
+ gobject_class->get_property = gsk_shader_paintable_get_property;
+ gobject_class->set_property = gsk_shader_paintable_set_property;
+ gobject_class->finalize = gsk_shader_paintable_finalize;
+
+ properties[PROP_SHADER] =
+ g_param_spec_object ("shader", "Shader", "The shader",
+ GSK_TYPE_GL_SHADER,
+ G_PARAM_READWRITE | G_PARAM_EXPLICIT_NOTIFY | G_PARAM_STATIC_STRINGS);
+
+ properties[PROP_ARGS] =
+ g_param_spec_boxed ("args", "Arguments", "The uniform arguments",
+ G_TYPE_BYTES,
+ G_PARAM_READWRITE | G_PARAM_EXPLICIT_NOTIFY | G_PARAM_STATIC_STRINGS);
+
+ g_object_class_install_properties (gobject_class, N_PROPS, properties);
+}
+
+static void
+gsk_shader_paintable_init (GskShaderPaintable *self)
+{
+}
+
+/**
+ * gsk_shader_paintable_new:
+ * @shader: (transfer full) (nullable): the shader to use
+ * @data: (transfer full) (nullable): uniform data
+ *
+ * Creates a paintable that uses the @shader to create
+ * pixels. The shader must not require input textures.
+ * If @data is %NULL, all uniform values are set to zero.
+ *
+ * Returns: (transfer full): a new #GskShaderPaintable
+ */
+GdkPaintable *
+gsk_shader_paintable_new (GskGLShader *shader,
+ GBytes *data)
+{
+ GdkPaintable *ret;
+
+ g_return_val_if_fail (shader == NULL || GSK_IS_GL_SHADER (shader), NULL);
+
+ if (shader && !data)
+ {
+ int size = gsk_gl_shader_get_args_size (shader);
+ data = g_bytes_new_take (g_new0 (guchar, size), size);
+ }
+
+ ret = g_object_new (GSK_TYPE_SHADER_PAINTABLE,
+ "shader", shader,
+ "args", data,
+ NULL);
+
+ g_clear_object (&shader);
+ g_clear_pointer (&data, g_bytes_unref);
+
+ return ret;
+}
+
+/**
+ * gsk_shader_paintable_set_shader:
+ * @self: a #GskShaderPaintable
+ * @shader: the #GskGLShader to use
+ *
+ * Sets the shader that the paintable will use
+ * to create pixels. The shader must not require
+ * input textures.
+ */
+void
+gsk_shader_paintable_set_shader (GskShaderPaintable *self,
+ GskGLShader *shader)
+{
+ g_return_if_fail (GSK_IS_SHADER_PAINTABLE (self));
+ g_return_if_fail (shader == NULL || GSK_IS_GL_SHADER (shader));
+ g_return_if_fail (shader == NULL || gsk_gl_shader_get_n_textures (shader) == 0);
+
+ if (!g_set_object (&self->shader, shader))
+ return;
+
+ g_object_notify_by_pspec (G_OBJECT (self), properties[PROP_SHADER]);
+ gdk_paintable_invalidate_contents (GDK_PAINTABLE (self));
+
+ g_clear_pointer (&self->args, g_bytes_unref);
+}
+
+/**
+ * gsk_shader_paintable_get_shader:
+ * @self: a #GskShaderPaintable
+ *
+ * Returns the shader that the paintable is using.
+ *
+ * Returns: (transfer none): the #GskGLShader that is used
+ */
+GskGLShader *
+gsk_shader_paintable_get_shader (GskShaderPaintable *self)
+{
+ g_return_val_if_fail (GSK_IS_SHADER_PAINTABLE (self), NULL);
+
+ return self->shader;
+}
+
+/**
+ * gsk_shader_paintable_set_args:
+ * @self: a #GskShaderPaintable
+ * @data: Data block with uniform data for the shader
+ *
+ * Sets the uniform data that will be passed to the
+ * shader when rendering. The @data will typically
+ * be produced by a #GskUniformDataBuilder.
+ *
+ * Note that the @data should be considered immutable
+ * after it has been passed to this function.
+ */
+void
+gsk_shader_paintable_set_args (GskShaderPaintable *self,
+ GBytes *data)
+{
+ g_return_if_fail (GSK_IS_SHADER_PAINTABLE (self));
+ g_return_if_fail (data == NULL || g_bytes_get_size (data) == gsk_gl_shader_get_args_size (self->shader));
+
+ g_clear_pointer (&self->args, g_bytes_unref);
+ if (data)
+ self->args = g_bytes_ref (data);
+
+ g_object_notify_by_pspec (G_OBJECT (self), properties[PROP_ARGS]);
+ gdk_paintable_invalidate_contents (GDK_PAINTABLE (self));
+}
+
+/**
+ * gsk_shader_paintable_get_args:
+ * @self: a #GskShaderPaintable
+ *
+ * Returns the uniform data set with
+ * gsk_shader_paintable_get_args().
+ *
+ * Returns: (transfer none): the uniform data
+ */
+GBytes *
+gsk_shader_paintable_get_args (GskShaderPaintable *self)
+{
+ g_return_val_if_fail (GSK_IS_SHADER_PAINTABLE (self), NULL);
+
+ return self->args;
+}
+
+/**
+ * gsk_shader_paintable_update_time:
+ * @self: a #GskShaderPaintable
+ * @time_idx: the index of the uniform for time in seconds as float
+ * @frame_time: the current frame time, as returned by #GdkFrameClock
+ *
+ * This function is a convenience wrapper for
+ * gsk_shader_paintable_set_args() that leaves all
+ * uniform values unchanged, except for the uniform with
+ * index @time_idx, which will be set to the elapsed time
+ * in seconds, since the first call to this function.
+ *
+ * This function is usually called from a #GtkTickCallback.
+ */
+void
+gsk_shader_paintable_update_time (GskShaderPaintable *self,
+ int time_idx,
+ gint64 frame_time)
+{
+ GskShaderArgsBuilder *builder;
+ GBytes *args;
+ float time;
+
+ if (self->start_time == 0)
+ self->start_time = frame_time;
+
+ time = (frame_time - self->start_time) / (float)G_TIME_SPAN_SECOND;
+
+ builder = gsk_shader_args_builder_new (self->shader, self->args);
+ gsk_shader_args_builder_set_float (builder, time_idx, time);
+ args = gsk_shader_args_builder_free_to_args (builder);
+
+ gsk_shader_paintable_set_args (self, args);
+
+ g_bytes_unref (args);
+}
diff --git a/demos/gtk-demo/gskshaderpaintable.h b/demos/gtk-demo/gskshaderpaintable.h
new file mode 100644
index 0000000000..9b8f7db83f
--- /dev/null
+++ b/demos/gtk-demo/gskshaderpaintable.h
@@ -0,0 +1,53 @@
+/*
+ * Copyright © 2020 Red Hat, Inc.
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library. If not, see <http://www.gnu.org/licenses/>.
+ *
+ * Authors: Matthias Clasen <mclasen redhat com>
+ */
+
+#ifndef __GSK_SHADER_PAINTABLE_H__
+#define __GSK_SHADER_PAINTABLE_H__
+
+#include <gdk/gdk.h>
+#include <gsk/gsk.h>
+
+G_BEGIN_DECLS
+
+#define GSK_TYPE_SHADER_PAINTABLE (gsk_shader_paintable_get_type ())
+
+GDK_AVAILABLE_IN_ALL
+G_DECLARE_FINAL_TYPE (GskShaderPaintable, gsk_shader_paintable, GSK, SHADER_PAINTABLE, GObject)
+
+GDK_AVAILABLE_IN_ALL
+GdkPaintable * gsk_shader_paintable_new (GskGLShader *shader,
+ GBytes *data);
+
+GDK_AVAILABLE_IN_ALL
+GskGLShader * gsk_shader_paintable_get_shader (GskShaderPaintable *self);
+GDK_AVAILABLE_IN_ALL
+void gsk_shader_paintable_set_shader (GskShaderPaintable *self,
+ GskGLShader *shader);
+GDK_AVAILABLE_IN_ALL
+GBytes * gsk_shader_paintable_get_args (GskShaderPaintable *self);
+GDK_AVAILABLE_IN_ALL
+void gsk_shader_paintable_set_args (GskShaderPaintable *self,
+ GBytes *data);
+GDK_AVAILABLE_IN_ALL
+void gsk_shader_paintable_update_time (GskShaderPaintable *self,
+ int time_idx,
+ gint64 frame_time);
+G_END_DECLS
+
+#endif /* __GSK_SHADER_PAINTABLE_H__ */
diff --git a/demos/gtk-demo/gtkshaderbin.c b/demos/gtk-demo/gtkshaderbin.c
new file mode 100644
index 0000000000..3a97311c3e
--- /dev/null
+++ b/demos/gtk-demo/gtkshaderbin.c
@@ -0,0 +1,241 @@
+#include "gtkshaderbin.h"
+
+typedef struct {
+ GskGLShader *shader;
+ GtkStateFlags state;
+ GtkStateFlags state_mask;
+ gboolean compiled;
+ gboolean compiled_ok;
+} ShaderInfo;
+
+struct _GtkShaderBin
+{
+ GtkWidget parent_instance;
+ GtkWidget *child;
+ ShaderInfo *active_shader;
+ GPtrArray *shaders;
+ guint tick_id;
+ float time;
+ gint64 first_frame_time;
+};
+
+struct _GtkShaderBinClass
+{
+ GtkWidgetClass parent_class;
+};
+
+G_DEFINE_TYPE (GtkShaderBin, gtk_shader_bin, GTK_TYPE_WIDGET)
+
+static void
+shader_info_free (ShaderInfo *info)
+{
+ g_object_unref (info->shader);
+ g_free (info);
+}
+
+static void
+gtk_shader_bin_finalize (GObject *object)
+{
+ GtkShaderBin *self = GTK_SHADER_BIN (object);
+
+ g_ptr_array_free (self->shaders, TRUE);
+
+ G_OBJECT_CLASS (gtk_shader_bin_parent_class)->finalize (object);
+}
+
+static void
+gtk_shader_bin_dispose (GObject *object)
+{
+ GtkShaderBin *self = GTK_SHADER_BIN (object);
+
+ g_clear_pointer (&self->child, gtk_widget_unparent);
+
+ G_OBJECT_CLASS (gtk_shader_bin_parent_class)->dispose (object);
+}
+
+static gboolean
+gtk_shader_bin_tick (GtkWidget *widget,
+ GdkFrameClock *frame_clock,
+ gpointer unused)
+{
+ GtkShaderBin *self = GTK_SHADER_BIN (widget);
+ gint64 frame_time;
+
+ frame_time = gdk_frame_clock_get_frame_time (frame_clock);
+ if (self->first_frame_time == 0)
+ self->first_frame_time = frame_time;
+ self->time = (frame_time - self->first_frame_time) / (float)G_USEC_PER_SEC;
+
+ gtk_widget_queue_draw (widget);
+
+ return G_SOURCE_CONTINUE;
+}
+
+static void
+gtk_shader_bin_init (GtkShaderBin *self)
+{
+ self->shaders = g_ptr_array_new_with_free_func ((GDestroyNotify)shader_info_free);
+}
+
+void
+gtk_shader_bin_update_active_shader (GtkShaderBin *self)
+{
+ GtkStateFlags new_state = gtk_widget_get_state_flags (GTK_WIDGET (self));
+ ShaderInfo *new_shader = NULL;
+
+ for (int i = 0; i < self->shaders->len; i++)
+ {
+ ShaderInfo *info = g_ptr_array_index (self->shaders, i);
+
+ if ((info->state_mask & new_state) == info->state)
+ {
+ new_shader = info;
+ break;
+ }
+ }
+
+ if (self->active_shader == new_shader)
+ return;
+
+ self->active_shader = new_shader;
+ self->first_frame_time = 0;
+
+ if (self->active_shader)
+ {
+ if (self->tick_id == 0)
+ self->tick_id = gtk_widget_add_tick_callback (GTK_WIDGET (self),
+ gtk_shader_bin_tick,
+ NULL, NULL);
+ }
+ else
+ {
+ if (self->tick_id != 0)
+ {
+ gtk_widget_remove_tick_callback (GTK_WIDGET (self), self->tick_id);
+ self->tick_id = 0;
+ }
+ }
+
+ gtk_widget_queue_draw (GTK_WIDGET (self));
+}
+
+static void
+gtk_shader_bin_state_flags_changed (GtkWidget *widget,
+ GtkStateFlags previous_state_flags)
+{
+ GtkShaderBin *self = GTK_SHADER_BIN (widget);
+
+ gtk_shader_bin_update_active_shader (self);
+}
+
+void
+gtk_shader_bin_add_shader (GtkShaderBin *self,
+ GskGLShader *shader,
+ GtkStateFlags state,
+ GtkStateFlags state_mask)
+{
+ ShaderInfo *info = g_new0 (ShaderInfo, 1);
+ info->shader = g_object_ref (shader);
+ info->state = state;
+ info->state_mask = state_mask;
+
+ g_ptr_array_add (self->shaders, info);
+
+ gtk_shader_bin_update_active_shader (self);
+}
+
+void
+gtk_shader_bin_set_child (GtkShaderBin *self,
+ GtkWidget *child)
+{
+
+ if (self->child == child)
+ return;
+
+ g_clear_pointer (&self->child, gtk_widget_unparent);
+
+ if (child)
+ {
+ self->child = child;
+ gtk_widget_set_parent (child, GTK_WIDGET (self));
+ }
+}
+
+GtkWidget *
+gtk_shader_bin_get_child (GtkShaderBin *self)
+{
+ return self->child;
+}
+
+static void
+gtk_shader_bin_snapshot (GtkWidget *widget,
+ GtkSnapshot *snapshot)
+{
+ GtkShaderBin *self = GTK_SHADER_BIN (widget);
+ int width, height;
+
+ width = gtk_widget_get_width (widget);
+ height = gtk_widget_get_height (widget);
+
+ if (self->active_shader)
+ {
+ if (!self->active_shader->compiled)
+ {
+ GtkNative *native = gtk_widget_get_native (widget);
+ GskRenderer *renderer = gtk_native_get_renderer (native);
+ GError *error = NULL;
+
+ self->active_shader->compiled = TRUE;
+ self->active_shader->compiled_ok =
+ gsk_gl_shader_compile (self->active_shader->shader,
+ renderer, &error);
+ if (!self->active_shader->compiled_ok)
+ {
+ g_warning ("GtkShaderBin failed to compile shader: %s", error->message);
+ g_error_free (error);
+ }
+ }
+
+ if (self->active_shader->compiled_ok)
+ {
+ gtk_snapshot_push_gl_shader (snapshot, self->active_shader->shader,
+ &GRAPHENE_RECT_INIT(0, 0, width, height),
+ gsk_gl_shader_format_args (self->active_shader->shader,
+ "u_time", self->time,
+ NULL));
+ gtk_widget_snapshot_child (widget, self->child, snapshot);
+ gtk_snapshot_gl_shader_pop_texture (snapshot);
+ gtk_snapshot_pop (snapshot);
+
+ return;
+ }
+ }
+
+ /* Non-shader fallback */
+ gtk_widget_snapshot_child (widget, self->child, snapshot);
+}
+
+static void
+gtk_shader_bin_class_init (GtkShaderBinClass *class)
+{
+ GtkWidgetClass *widget_class = GTK_WIDGET_CLASS (class);
+ GObjectClass *object_class = G_OBJECT_CLASS (class);
+
+ object_class->finalize = gtk_shader_bin_finalize;
+ object_class->dispose = gtk_shader_bin_dispose;
+
+ gtk_widget_class_set_layout_manager_type (widget_class, GTK_TYPE_BIN_LAYOUT);
+
+ widget_class->snapshot = gtk_shader_bin_snapshot;
+ widget_class->state_flags_changed = gtk_shader_bin_state_flags_changed;
+}
+
+GtkWidget *
+gtk_shader_bin_new (void)
+{
+ GtkShaderBin *self;
+
+ self = g_object_new (GTK_TYPE_SHADER_BIN, NULL);
+
+ return GTK_WIDGET (self);
+}
diff --git a/demos/gtk-demo/gtkshaderbin.h b/demos/gtk-demo/gtkshaderbin.h
new file mode 100644
index 0000000000..eabac8f0d6
--- /dev/null
+++ b/demos/gtk-demo/gtkshaderbin.h
@@ -0,0 +1,22 @@
+#ifndef __GTK_SHADER_BIN_H__
+#define __GTK_SHADER_BIN_H__
+
+#include <gtk/gtk.h>
+
+G_BEGIN_DECLS
+
+#define GTK_TYPE_SHADER_BIN (gtk_shader_bin_get_type ())
+G_DECLARE_FINAL_TYPE (GtkShaderBin, gtk_shader_bin, GTK, SHADER_BIN, GtkWidget)
+
+GtkWidget *gtk_shader_bin_new (void);
+void gtk_shader_bin_add_shader (GtkShaderBin *self,
+ GskGLShader *shader,
+ GtkStateFlags state,
+ GtkStateFlags state_mask);
+void gtk_shader_bin_set_child (GtkShaderBin *self,
+ GtkWidget *child);
+GtkWidget *gtk_shader_bin_get_child (GtkShaderBin *self);
+
+G_END_DECLS
+
+#endif /* __GTK_SHADER_BIN_H__ */
diff --git a/demos/gtk-demo/gtkshaderstack.c b/demos/gtk-demo/gtkshaderstack.c
new file mode 100644
index 0000000000..27194df3b1
--- /dev/null
+++ b/demos/gtk-demo/gtkshaderstack.c
@@ -0,0 +1,352 @@
+#include "gtkshaderstack.h"
+
+struct _GtkShaderStack
+{
+ GtkWidget parent_instance;
+
+ GskGLShader *shader;
+ GPtrArray *children;
+ int current;
+ int next;
+ gboolean backwards;
+
+ guint tick_id;
+ float time;
+ float duration;
+ gint64 start_time;
+};
+
+struct _GtkShaderStackClass
+{
+ GtkWidgetClass parent_class;
+};
+
+
+enum {
+ PROP_DURATION = 1,
+ NUM_PROPERTIES
+};
+
+static GParamSpec *properties[NUM_PROPERTIES] = { NULL };
+
+G_DEFINE_TYPE (GtkShaderStack, gtk_shader_stack, GTK_TYPE_WIDGET)
+
+static void
+gtk_shader_stack_finalize (GObject *object)
+{
+ GtkShaderStack *self = GTK_SHADER_STACK (object);
+
+ g_object_unref (self->shader);
+
+ G_OBJECT_CLASS (gtk_shader_stack_parent_class)->finalize (object);
+}
+
+static void
+update_child_visible (GtkShaderStack *self)
+{
+ int i;
+
+ for (i = 0; i < self->children->len; i++)
+ {
+ GtkWidget *child = g_ptr_array_index (self->children, i);
+
+ gtk_widget_set_child_visible (child,
+ i == self->current || i == self->next);
+ }
+}
+
+static gboolean
+transition_cb (GtkWidget *widget,
+ GdkFrameClock *clock,
+ gpointer unused)
+{
+ GtkShaderStack *self = GTK_SHADER_STACK (widget);
+ gint64 frame_time;
+
+ frame_time = gdk_frame_clock_get_frame_time (clock);
+
+ if (self->start_time == 0)
+ self->start_time = frame_time;
+
+ self->time = (frame_time - self->start_time) / (float)G_USEC_PER_SEC;
+
+ gtk_widget_queue_draw (widget);
+
+ if (self->time >= self->duration)
+ {
+ self->current = self->next;
+ self->next = -1;
+
+ update_child_visible (self);
+
+ return G_SOURCE_REMOVE;
+ }
+ else
+ return G_SOURCE_CONTINUE;
+}
+
+static void
+start_transition (GtkShaderStack *self)
+{
+ self->start_time = 0;
+ self->tick_id = gtk_widget_add_tick_callback (GTK_WIDGET (self),
+ transition_cb,
+ NULL, NULL);
+}
+
+static void
+stop_transition (GtkShaderStack *self)
+{
+ if (self->tick_id != 0)
+ {
+ gtk_widget_remove_tick_callback (GTK_WIDGET (self), self->tick_id);
+ self->tick_id = 0;
+ }
+
+ if (self->next != -1)
+ self->current = self->next;
+ self->next = -1;
+
+ update_child_visible (self);
+}
+
+static void
+gtk_shader_stack_dispose (GObject *object)
+{
+ GtkShaderStack *self = GTK_SHADER_STACK (object);
+
+ stop_transition (self);
+
+ g_clear_pointer (&self->children, g_ptr_array_unref);
+
+ G_OBJECT_CLASS (gtk_shader_stack_parent_class)->dispose (object);
+}
+
+void
+gtk_shader_stack_transition (GtkShaderStack *self,
+ gboolean forward)
+{
+ stop_transition (self);
+
+ self->backwards = !forward;
+ if (self->backwards)
+ self->next = (self->current + self->children->len - 1) % self->children->len;
+ else
+ self->next = (self->current + 1) % self->children->len;
+
+ update_child_visible (self);
+
+ start_transition (self);
+}
+
+static void
+gtk_shader_stack_init (GtkShaderStack *self)
+{
+ self->children = g_ptr_array_new_with_free_func ((GDestroyNotify)gtk_widget_unparent);
+ self->current = -1;
+ self->next = -1;
+ self->backwards = FALSE;
+ self->duration = 1.0;
+}
+
+static void
+gtk_shader_stack_measure (GtkWidget *widget,
+ GtkOrientation orientation,
+ int for_size,
+ int *minimum,
+ int *natural,
+ int *minimum_baseline,
+ int *natural_baseline)
+{
+ GtkShaderStack *self = GTK_SHADER_STACK (widget);
+ int i;
+
+ *minimum = 0;
+ *natural = 0;
+
+ for (i = 0; i < self->children->len; i++)
+ {
+ GtkWidget *child = g_ptr_array_index (self->children, i);
+ int child_min, child_nat;
+
+ if (gtk_widget_get_visible (child))
+ {
+ gtk_widget_measure (child, orientation, for_size, &child_min, &child_nat, NULL, NULL);
+
+ *minimum = MAX (*minimum, child_min);
+ *natural = MAX (*natural, child_nat);
+ }
+ }
+}
+
+static void
+gtk_shader_stack_size_allocate (GtkWidget *widget,
+ int width,
+ int height,
+ int baseline)
+{
+ GtkShaderStack *self = GTK_SHADER_STACK (widget);
+ GtkAllocation child_allocation;
+ GtkWidget *child;
+ int i;
+
+ child_allocation.x = 0;
+ child_allocation.y = 0;
+ child_allocation.width = width;
+ child_allocation.height = height;
+
+ for (i = 0; i < self->children->len; i++)
+ {
+ child = g_ptr_array_index (self->children, i);
+ if (gtk_widget_get_visible (child))
+ gtk_widget_size_allocate (child, &child_allocation, -1);
+ }
+}
+
+static void
+gtk_shader_stack_snapshot (GtkWidget *widget,
+ GtkSnapshot *snapshot)
+{
+ GtkShaderStack *self = GTK_SHADER_STACK (widget);
+ int width, height;
+ GtkWidget *current, *next;
+
+ width = gtk_widget_get_width (widget);
+ height = gtk_widget_get_height (widget);
+
+ current = g_ptr_array_index (self->children, self->current);
+
+ if (self->next == -1)
+ {
+ gtk_widget_snapshot_child (widget, current, snapshot);
+ }
+ else
+ {
+ GtkNative *native = gtk_widget_get_native (widget);
+ GskRenderer *renderer = gtk_native_get_renderer (native);
+ float progress;
+
+ next = g_ptr_array_index (self->children, self->next);
+
+ progress = self->time / self->duration;
+
+ if (self->backwards)
+ {
+ GtkWidget *tmp = next;
+ next = current;
+ current = tmp;
+ progress = 1. - progress;
+ }
+
+ if (gsk_gl_shader_compile (self->shader, renderer, NULL))
+ {
+ gtk_snapshot_push_gl_shader (snapshot,
+ self->shader,
+ &GRAPHENE_RECT_INIT(0, 0, width, height),
+ gsk_gl_shader_format_args (self->shader,
+ "progress", progress,
+ NULL));
+
+ gtk_widget_snapshot_child (widget, current, snapshot);
+ gtk_snapshot_gl_shader_pop_texture (snapshot); /* current child */
+ gtk_widget_snapshot_child (widget, next, snapshot);
+ gtk_snapshot_gl_shader_pop_texture (snapshot); /* next child */
+ gtk_snapshot_pop (snapshot);
+ }
+ else
+ {
+ /* Non-shader fallback */
+ gtk_widget_snapshot_child (widget, current, snapshot);
+ }
+ }
+}
+
+static void
+gtk_shader_stack_get_property (GObject *object,
+ guint prop_id,
+ GValue *value,
+ GParamSpec *pspec)
+{
+ GtkShaderStack *self = GTK_SHADER_STACK (object);
+
+ switch (prop_id)
+ {
+ case PROP_DURATION:
+ g_value_set_float (value, self->duration);
+ break;
+
+ default:
+ G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
+ break;
+ }
+}
+
+static void
+gtk_shader_stack_set_property (GObject *object,
+ guint prop_id,
+ const GValue *value,
+ GParamSpec *pspec)
+{
+ GtkShaderStack *self = GTK_SHADER_STACK (object);
+
+ switch (prop_id)
+ {
+ case PROP_DURATION:
+ self->duration = g_value_get_float (value);
+ break;
+
+ default:
+ G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
+ break;
+ }
+}
+
+static void
+gtk_shader_stack_class_init (GtkShaderStackClass *class)
+{
+ GtkWidgetClass *widget_class = GTK_WIDGET_CLASS (class);
+ GObjectClass *object_class = G_OBJECT_CLASS (class);
+
+ object_class->finalize = gtk_shader_stack_finalize;
+ object_class->dispose = gtk_shader_stack_dispose;
+ object_class->get_property = gtk_shader_stack_get_property;
+ object_class->set_property = gtk_shader_stack_set_property;
+
+ widget_class->snapshot = gtk_shader_stack_snapshot;
+ widget_class->measure = gtk_shader_stack_measure;
+ widget_class->size_allocate = gtk_shader_stack_size_allocate;
+
+ properties[PROP_DURATION] =
+ g_param_spec_float ("duration", "Duration", "Duration",
+ 0.1, 3.0, 1.0,
+ G_PARAM_READWRITE);
+
+ g_object_class_install_properties (object_class, NUM_PROPERTIES, properties);
+}
+
+GtkWidget *
+gtk_shader_stack_new (void)
+{
+ return g_object_new (GTK_TYPE_SHADER_STACK, NULL);
+}
+
+void
+gtk_shader_stack_set_shader (GtkShaderStack *self,
+ GskGLShader *shader)
+{
+ g_set_object (&self->shader, shader);
+}
+
+void
+gtk_shader_stack_add_child (GtkShaderStack *self,
+ GtkWidget *child)
+{
+ g_ptr_array_add (self->children, child);
+ gtk_widget_set_parent (child, GTK_WIDGET (self));
+ gtk_widget_queue_resize (GTK_WIDGET (self));
+
+ if (self->current == -1)
+ self->current = 0;
+ else
+ gtk_widget_set_child_visible (child, FALSE);
+}
diff --git a/demos/gtk-demo/gtkshaderstack.h b/demos/gtk-demo/gtkshaderstack.h
new file mode 100644
index 0000000000..9f8e4e45e5
--- /dev/null
+++ b/demos/gtk-demo/gtkshaderstack.h
@@ -0,0 +1,21 @@
+#ifndef __GTK_SHADER_STACK_H__
+#define __GTK_SHADER_STACK_H__
+
+#include <gtk/gtk.h>
+
+G_BEGIN_DECLS
+
+#define GTK_TYPE_SHADER_STACK (gtk_shader_stack_get_type ())
+G_DECLARE_FINAL_TYPE (GtkShaderStack, gtk_shader_stack, GTK, SHADER_STACK, GtkWidget)
+
+GtkWidget * gtk_shader_stack_new (void);
+void gtk_shader_stack_set_shader (GtkShaderStack *self,
+ GskGLShader *shader);
+void gtk_shader_stack_add_child (GtkShaderStack *self,
+ GtkWidget *child);
+void gtk_shader_stack_transition (GtkShaderStack *self,
+ gboolean forward);
+
+G_END_DECLS
+
+#endif /* __GTK_SHADER_STACK_H__ */
diff --git a/demos/gtk-demo/meson.build b/demos/gtk-demo/meson.build
index a32fee88e5..ecb08ebaac 100644
--- a/demos/gtk-demo/meson.build
+++ b/demos/gtk-demo/meson.build
@@ -32,6 +32,7 @@ demos = files([
'gears.c',
'gestures.c',
'glarea.c',
+ 'gltransition.c',
'headerbar.c',
'hypertext.c',
'iconscroll.c',
@@ -102,7 +103,10 @@ extra_demo_sources = files(['main.c',
'gtkfishbowl.c',
'fontplane.c',
'gtkgears.c',
+ 'gtkshaderbin.c',
'gtkshadertoy.c',
+ 'gtkshaderstack.c',
+ 'gskshaderpaintable.c',
'puzzlepiece.c',
'bluroverlay.c',
'demoimage.c',
diff --git a/demos/gtk-demo/transition1.glsl b/demos/gtk-demo/transition1.glsl
new file mode 100644
index 0000000000..169bdcbd06
--- /dev/null
+++ b/demos/gtk-demo/transition1.glsl
@@ -0,0 +1,33 @@
+uniform float progress;
+uniform sampler2D u_texture1;
+uniform sampler2D u_texture2;
+
+vec4 getFromColor (vec2 uv) {
+ return GskTexture(u_texture1, uv);
+}
+
+vec4 getToColor (vec2 uv) {
+ return GskTexture(u_texture2, uv);
+}
+
+// Source: https://gl-transitions.com/editor/wind
+// Author: gre
+// License: MIT
+
+const float size = 0.2;
+
+float rand(vec2 co) {
+ return fract(sin(dot(co.xy ,vec2(12.9898,78.233))) * 43758.5453);
+}
+
+vec4 transition(vec2 p) {
+ float r = rand(vec2(0, p.y));
+ float m = smoothstep(0.0, -size, p.x*(1.0-size) + size*r - (progress * (1.0 + size)));
+ return mix(getFromColor(p), getToColor(p), m);
+}
+
+
+void mainImage(out vec4 fragColor, in vec2 fragCoord, in vec2 resolution, in vec2 uv)
+{
+ fragColor = transition(uv);
+}
diff --git a/demos/gtk-demo/transition2.glsl b/demos/gtk-demo/transition2.glsl
new file mode 100644
index 0000000000..11757f4e60
--- /dev/null
+++ b/demos/gtk-demo/transition2.glsl
@@ -0,0 +1,34 @@
+uniform float progress;
+uniform sampler2D u_texture1;
+uniform sampler2D u_texture2;
+
+vec4 getFromColor (vec2 uv) {
+ return GskTexture(u_texture1, uv);
+}
+
+vec4 getToColor (vec2 uv) {
+ return GskTexture(u_texture2, uv);
+}
+
+// Source: https://gl-transitions.com/editor/Radial
+// License: MIT
+// Author: Xaychru
+
+const float smoothness = 1.0;
+
+const float PI = 3.141592653589;
+
+vec4 transition(vec2 p) {
+ vec2 rp = p*2.-1.;
+ return mix(
+ getToColor(p),
+ getFromColor(p),
+ smoothstep(0., smoothness, atan(rp.y,rp.x) - (progress-.5) * PI * 2.5)
+ );
+}
+
+
+void mainImage(out vec4 fragColor, in vec2 fragCoord, in vec2 resolution, in vec2 uv)
+{
+ fragColor = transition(uv);
+}
diff --git a/demos/gtk-demo/transition3.glsl b/demos/gtk-demo/transition3.glsl
new file mode 100644
index 0000000000..e1cc5f9afc
--- /dev/null
+++ b/demos/gtk-demo/transition3.glsl
@@ -0,0 +1,27 @@
+uniform float progress;
+uniform sampler2D u_texture1;
+uniform sampler2D u_texture2;
+
+vec4 getFromColor (vec2 uv) {
+ return GskTexture(u_texture1, uv);
+}
+
+vec4 getToColor (vec2 uv) {
+ return GskTexture(u_texture2, uv);
+}
+
+// Source: https://gl-transitions.com/editor/crosswarp
+// Author: Eke Péter <peterekepeter gmail com>
+// License: MIT
+
+vec4 transition(vec2 p) {
+ float x = progress;
+ x=smoothstep(.0,1.0,(x*2.0+p.x-1.0));
+ return mix(getFromColor((p-.5)*(1.-x)+.5), getToColor((p-.5)*x+.5), x);
+}
+
+
+void mainImage(out vec4 fragColor, in vec2 fragCoord, in vec2 resolution, in vec2 uv)
+{
+ fragColor = transition(uv);
+}
diff --git a/demos/gtk-demo/transition4.glsl b/demos/gtk-demo/transition4.glsl
new file mode 100644
index 0000000000..d516b3de59
--- /dev/null
+++ b/demos/gtk-demo/transition4.glsl
@@ -0,0 +1,41 @@
+uniform float progress;
+uniform sampler2D u_texture1;
+uniform sampler2D u_texture2;
+
+vec4 getFromColor (vec2 uv) {
+ return GskTexture(u_texture1, uv);
+}
+
+vec4 getToColor (vec2 uv) {
+ return GskTexture(u_texture2, uv);
+}
+
+// Source: https://gl-transitions.com/editor/kaleidoscope
+// Author: nwoeanhinnogaehr
+// License: MIT
+
+const float speed = 1.0;
+const float angle = 1.0;
+const float power = 1.5;
+
+vec4 transition(vec2 uv) {
+ vec2 p = uv.xy / vec2(1.0).xy;
+ vec2 q = p;
+ float t = pow(progress, power)*speed;
+ p = p -0.5;
+ for (int i = 0; i < 7; i++) {
+ p = vec2(sin(t)*p.x + cos(t)*p.y, sin(t)*p.y - cos(t)*p.x);
+ t += angle;
+ p = abs(mod(p, 2.0) - 1.0);
+ }
+ abs(mod(p, 1.0));
+ return mix(
+ mix(getFromColor(q), getToColor(q), progress),
+ mix(getFromColor(p), getToColor(p), progress), 1.0 - 2.0*abs(progress - 0.5));
+}
+
+
+void mainImage(out vec4 fragColor, in vec2 fragCoord, in vec2 resolution, in vec2 uv)
+{
+ fragColor = transition(uv);
+}
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