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🚚 Use simpler effect class names

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This commit is contained in:
Simon Schneegans
2022-01-16 05:46:22 +01:00
parent 5287ac2614
commit ee37015d6d
7 changed files with 24 additions and 27 deletions
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src/TRexAttack.js
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//////////////////////////////////////////////////////////////////////////////////////////
// ) ( //
// ( /( ( ( ) ( ( ( ( )\ ) ( ( //
// )\()) ))\ )( ( ( )\ ) )\))( )\ ( (()/( ( )\))( ( //
// ((_)\ /((_|()\ )\ ) )\ '(()/( ((_)()((_) )\ ) ((_)))\((_)()\ )\ //
// | |(_|_))( ((_)_(_/( _((_)) )(_)) _(()((_|_)_(_/( _| |((_)(()((_|(_) //
// | '_ \ || | '_| ' \)) | ' \()| || | \ V V / | ' \)) _` / _ \ V V (_-< //
// |_.__/\_,_|_| |_||_| |_|_|_| \_, | \_/\_/|_|_||_|\__,_\___/\_/\_//__/ //
// |__/ //
// Copyright (c) 2021 Simon Schneegans //
// Released under the GPLv3 or later. See LICENSE file for details. //
//////////////////////////////////////////////////////////////////////////////////////////
'use strict';
const GObject = imports.gi.GObject;
const ExtensionUtils = imports.misc.extensionUtils;
const Me = imports.misc.extensionUtils.getCurrentExtension();
const utils = Me.imports.src.utils;
//////////////////////////////////////////////////////////////////////////////////////////
// This effect tears your windows apart with a series of violent scratches! //
// This effect is not available on GNOME 3.3x, due to the limitation described in the //
// documentation of vfunc_paint_target further down in this file. //
//////////////////////////////////////////////////////////////////////////////////////////
// The shader class for this effect is registered further down in this file.
let Shader = null;
// The effect class is completely static. It can be used to get some metadata (like the
// effect's name or supported GNOME Shell versions), to initialize the respective page of
// the settings dialog, as well as to create the actual shader for the effect.
var TRexAttack = class TRexAttack {
// ---------------------------------------------------------------------------- metadata
// This effect is only available on GNOME Shell 40+.
static getMinShellVersion() {
return [40, 0];
}
// This will be called in various places where a unique identifier for this effect is
// required. It should match the prefix of the settings keys which store whether the
// effect is enabled currently (e.g. the '*-close-effect').
static getNick() {
return 'trex';
}
// This will be shown in the sidebar of the preferences dialog as well as in the
// drop-down menus where the user can choose the effect.
static getLabel() {
return 'T-Rex Attack';
}
// -------------------------------------------------------------------- API for prefs.js
// This is called by the preferences dialog. It loads the settings page for this effect,
// binds all properties to the settings and appends the page to the main stack of the
// preferences dialog.
static initPreferences(dialog) {
// Add the settings page to the builder.
dialog.getBuilder().add_from_resource('/ui/gtk4/trexPage.ui');
// Bind all properties.
dialog.bindAdjustment('trex-animation-time');
dialog.bindColorButton('claw-scratch-color');
dialog.bindAdjustment('claw-scratch-scale');
dialog.bindAdjustment('claw-scratch-count');
dialog.bindAdjustment('claw-scratch-warp');
// Finally, append the settings page to the main stack.
const stack = dialog.getBuilder().get_object('main-stack');
stack.add_titled(
dialog.getBuilder().get_object('trex-prefs'), TRexAttack.getNick(),
TRexAttack.getLabel());
}
// ---------------------------------------------------------------- API for extension.js
// This is called from extension.js whenever a window is closed with this effect.
static createShader(settings) {
return new Shader(settings);
}
// This is also called from extension.js. It is used to tweak the ongoing transitions of
// the actor - usually windows are faded to transparency and scaled down slightly by
// GNOME Shell. Here, we modify this behavior as well as the transition duration.
static tweakTransitions(actor, settings) {
const animationTime = settings.get_int('trex-animation-time');
const tweakTransition = (property, value) => {
const transition = actor.get_transition(property);
if (transition) {
transition.set_to(value);
transition.set_duration(animationTime);
}
};
// For this effect, we slightly increase the window's scale as part of the warp
// effect.
const warp = 0.5 * settings.get_double('claw-scratch-warp');
tweakTransition('opacity', 255);
tweakTransition('scale-x', 1.0 + warp);
tweakTransition('scale-y', 1.0 + warp);
}
}
//////////////////////////////////////////////////////////////////////////////////////////
// The shader class for this effect will only be registered in GNOME Shell's process //
// (not in the preferences process). It's done this way as Clutter may not be installed //
// on the system and therefore the preferences would crash. //
//////////////////////////////////////////////////////////////////////////////////////////
if (utils.isInShellProcess()) {
const {Clutter, GdkPixbuf, Cogl} = imports.gi;
const shaderSnippets = Me.imports.src.shaderSnippets;
Shader = GObject.registerClass({}, class Shader extends Clutter.ShaderEffect {
_init(settings) {
super._init({shader_type: Clutter.ShaderType.FRAGMENT_SHADER});
// Load the claw texture. As the shader is re-created for each window animation,
// this texture is also re-created each time. This could be improved in the future!
// See assets/README.md for how this texture was created.
const clawData = GdkPixbuf.Pixbuf.new_from_resource('/img/claws.png');
this._clawTexture = new Clutter.Image();
this._clawTexture.set_data(
clawData.get_pixels(), Cogl.PixelFormat.RGB_888, clawData.width,
clawData.height, clawData.rowstride);
const color =
Clutter.Color.from_string(settings.get_string('claw-scratch-color'))[1];
this.set_shader_source(`
// Inject some common shader snippets.
${shaderSnippets.standardUniforms()}
${shaderSnippets.noise()}
// See assets/README.md for how this texture was created.
uniform sampler2D uClawTexture;
const vec2 SEED = vec2(${Math.random()}, ${Math.random()});
const float CLAW_SIZE = ${settings.get_double('claw-scratch-scale')};
const float NUM_CLAWS = ${settings.get_int('claw-scratch-count')};
const float WARP_INTENSITY = 1.0 + ${settings.get_double('claw-scratch-warp')};
const float FLASH_INTENSITY = 0.1;
const float MAX_SPAWN_TIME = 0.5; // Scratches will only start in the first half of the animation.
const float FF_TIME = 0.5; // Relative time for the final fade to transparency.
// This method generates a grid of randomly rotated, slightly shifted and scaled
// UV squares. It returns the texture coords of the UV square at the given actor
// coordinates. If these do not fall into one of the UV grids, the coordinates of
// the closest UV grid will be clamped and returned.
vec2 getClawUV(vec2 texCoords, float gridScale, vec2 seed) {
// Shift coordinates by a random offset and make sure the have a 1:1 aspect ratio.
vec2 coords = texCoords + hash22(seed);
coords *= uSizeX < uSizeY ? vec2(1.0, 1.0 * uSizeY / uSizeX) : vec2(1.0 * uSizeX / uSizeY, 1.0);
// Apply global scale.
coords *= gridScale;
// Get grid cell coordinates in [0..1].
vec2 cellUV = mod(coords, vec2(1));
// This is unique for each cell.
vec2 cellID = coords-cellUV + vec2(362.456);
// Add random rotation, scale and offset to each grid cell.
float scale = mix(0.8, 1.0, hash12(cellID*seed*134.451));
float offsetX = mix(0.0, 1.0 - scale, hash12(cellID*seed*54.4129));
float offsetY = mix(0.0, 1.0 - scale, hash12(cellID*seed*25.3089));
float rotation = mix(0.0, 2.0 * 3.141, hash12(cellID*seed*2.99837));
cellUV -= vec2(offsetX, offsetY);
cellUV /= scale;
cellUV -= 0.5;
cellUV = vec2(cellUV.x * cos(rotation) - cellUV.y * sin(rotation),
cellUV.x * sin(rotation) + cellUV.y * cos(rotation));
cellUV += 0.5;
// Clamp resulting coordinates.
return clamp(cellUV, vec2(0), vec2(1));
}
void main() {
// Warp the texture coordinates to create a blow-up effect.
vec2 coords = cogl_tex_coord_in[0].st * 2.0 - 1.0;
float dist = length(coords);
coords = (coords/dist * pow(dist, WARP_INTENSITY)) * 0.5 + 0.5;
coords = mix(cogl_tex_coord_in[0].st, coords, uProgress);
// Accumulate several random scratches. The color in the scratch map refers to the
// relative time when the respective part will become invisible. Therefore we can
// add a value to make the scratch appear later.
float scratchMap = 1.0;
for (int i=0; i<NUM_CLAWS; ++i) {
vec2 uv = getClawUV(coords, 1.0/CLAW_SIZE, SEED*(i+1));
float delay = i/NUM_CLAWS * MAX_SPAWN_TIME;
scratchMap = min(scratchMap, clamp(texture2D(uClawTexture, uv).r + delay, 0, 1));
}
// Get the window texture. We shift the texture lookup by the local derivative of
// the claw texture in order to mimic some folding distortion.
vec2 offset = vec2(dFdx(scratchMap), dFdy(scratchMap)) * uProgress * 0.5;
cogl_color_out = texture2D(uTexture, coords + offset);
// Add colorful flashes.
float flashIntensity = 1.0 / FLASH_INTENSITY * (scratchMap - uProgress) + 1;
if (flashIntensity < 0 || flashIntensity >= 1) {
flashIntensity = 0;
}
// Hide flashes where there is now window.
flashIntensity *= cogl_color_out.a;
// Hide scratched out parts.
cogl_color_out *= (scratchMap > uProgress ? 1 : 0);
vec3 flashColor = vec3(${color.red / 255},
${color.green / 255},
${color.blue / 255}) * ${color.alpha / 255};
cogl_color_out.rgb += flashIntensity * mix(flashColor, vec3(0), uProgress);
// Fade out the remaining shards.
float fade = smoothstep(0, 1, 1 - clamp((uProgress - 1.0 + FF_TIME)/FF_TIME, 0, 1));
cogl_color_out *= fade;
// These are pretty useful for understanding how this works.
// cogl_color_out = vec4(vec3(flashIntensity), 1);
// cogl_color_out = vec4(vec3(scratchMap), 1);
}
`);
};
// This is overridden to bind the claw texture for drawing. Sadly, this seems to be
// impossible under GNOME 3.3x as this.get_pipeline() is not available. It was called
// get_target() back then but this is not wrapped in GJS.
// https://gitlab.gnome.org/GNOME/mutter/-/blob/gnome-3-36/clutter/clutter/clutter-offscreen-effect.c#L598
vfunc_paint_target(node, paint_context) {
const pipeline = this.get_pipeline();
pipeline.set_layer_texture(1, this._clawTexture.get_texture());
this.set_uniform_value('uClawTexture', 1);
super.vfunc_paint_target(node, paint_context);
}
});
}