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gtk-demo: Add GskGLShaderNode demo

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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.
This commit is contained in:
Alexander Larsson 2020-09-21 21:05:04 +02:00
parent 4d697283ae
commit 8bcb031418
15 changed files with 1805 additions and 0 deletions
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226
demos/gtk-demo/cogs2.glsl Normal file
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@ -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);
}

13
demos/gtk-demo/demo.gresource.xml
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@ -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>

72
demos/gtk-demo/fire.glsl Normal file
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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));
}

329
demos/gtk-demo/gltransition.c Normal file
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/* 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;
}

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/*
* 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);
}

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/*
* 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__ */

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#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);
}

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#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__ */

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#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);
}

21
demos/gtk-demo/gtkshaderstack.h Normal file
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@ -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__ */

4
demos/gtk-demo/meson.build
View File

@ -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',

33
demos/gtk-demo/transition1.glsl Normal file
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@ -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);
}

34
demos/gtk-demo/transition2.glsl Normal file
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@ -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);
}

27
demos/gtk-demo/transition3.glsl Normal file
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@ -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);
}

41
demos/gtk-demo/transition4.glsl Normal file
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@ -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);
}