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🔧 Use factory to create shaders

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This commit is contained in:
Simon Schneegans
2022-05-14 13:58:28 +02:00
parent cb4b87811e
commit e1017b7707
17 changed files with 767 additions and 817 deletions
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src/TRexAttack.js
+63 -80
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@@ -20,7 +20,7 @@ const _ = imports.gettext.domain('burn-my-windows').gettext;
const ExtensionUtils = imports.misc.extensionUtils;
const Me = imports.misc.extensionUtils.getCurrentExtension();
const utils = Me.imports.src.utils;
const Effect = Me.imports.src.Effect.Effect;
const ShaderFactory = Me.imports.src.ShaderFactory.ShaderFactory;
//////////////////////////////////////////////////////////////////////////////////////////
// This effect tears your windows apart with a series of violent scratches! //
@@ -31,7 +31,68 @@ const Effect = Me.imports.src.Effect.Effect;
// The effect class 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 extends Effect {
var TRexAttack = class TRexAttack {
// The constructor creates a ShaderFactory which will be used by extension.js to create
// shader instances for this effect. The shaders will be automagically created using the
// GLSL file in resources/shaders/<nick>.glsl. The callback will be called for each
// newly created shader instance.
constructor() {
this.shaderFactory = new ShaderFactory(this.getNick(), (shader) => {
// We import these modules in this function as they are not available in the
// preferences process. This callback is only called within GNOME Shell's process.
const {Clutter, GdkPixbuf, Cogl} = imports.gi;
// Create the texture in the first call.
if (!this._clawTexture) {
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);
}
// Store uniform locations of newly created shaders.
shader._uClawTexture = shader.get_uniform_location('uClawTexture');
shader._uFlashColor = shader.get_uniform_location('uFlashColor');
shader._uSeed = shader.get_uniform_location('uSeed');
shader._uClawSize = shader.get_uniform_location('uClawSize');
shader._uNumClaws = shader.get_uniform_location('uNumClaws');
shader._uWarpIntensity = shader.get_uniform_location('uWarpIntensity');
// Write all uniform values at the start of each animation.
shader.connect('begin-animation', (shader, settings) => {
const c = Clutter.Color.from_string(settings.get_string('claw-scratch-color'))[1];
// If we are currently performing integration test, the animation uses a fixed
// seed.
const testMode = settings.get_boolean('test-mode');
// clang-format off
shader.set_uniform_float(shader._uFlashColor, 4, [c.red / 255, c.green / 255, c.blue / 255, c.alpha / 255]);
shader.set_uniform_float(shader._uSeed, 2, [testMode ? 0 : Math.random(), testMode ? 0 : Math.random()]);
shader.set_uniform_float(shader._uClawSize, 1, [settings.get_double('claw-scratch-scale')]);
shader.set_uniform_float(shader._uNumClaws, 1, [settings.get_int('claw-scratch-count')]);
shader.set_uniform_float(shader._uWarpIntensity, 1, [settings.get_double('claw-scratch-warp')]);
// clang-format on
});
// This is required 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
shader.connect('paint-target', (shader) => {
const pipeline = shader.get_pipeline();
// Use linear filtering for the window texture.
pipeline.set_layer_filters(0, Cogl.PipelineFilter.LINEAR,
Cogl.PipelineFilter.LINEAR);
// Bind the claw texture.
pipeline.set_layer_texture(1, this._clawTexture.get_texture());
pipeline.set_uniform_1i(shader._uClawTexture, 1);
});
});
}
// ---------------------------------------------------------------------------- metadata
@@ -83,82 +144,4 @@ var TRexAttack = class TRexAttack extends Effect {
const scale = 1.0 + 0.5 * settings.get_double('claw-scratch-warp');
return {x: scale, y: scale};
}
// This is called from extension.js if the extension is disabled. This should free all
// static resources.
cleanUp() {
super.cleanUp();
this._clawTexture = null;
}
// This is called by the effect's base class whenever a new shader is required. Since
// this shader depends on classes by GNOME Shell, we register it locally in this method
// as this file is also included from the preferences dialog where those classes would
// not be available.
createShader() {
// Only register the shader class when this method is called for the first time.
if (!this._ShaderClass) {
const {Clutter, GdkPixbuf, Cogl} = imports.gi;
const Shader = Me.imports.src.Shader.Shader;
// Load the claw texture.
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);
this._ShaderClass = GObject.registerClass({}, class ShaderClass extends Shader {
// We use the constructor of the shader to store all required uniform locations.
_init(effect) {
super._init(effect);
this._uClawTexture = this.get_uniform_location('uClawTexture');
this._uFlashColor = this.get_uniform_location('uFlashColor');
this._uSeed = this.get_uniform_location('uSeed');
this._uClawSize = this.get_uniform_location('uClawSize');
this._uNumClaws = this.get_uniform_location('uNumClaws');
this._uWarpIntensity = this.get_uniform_location('uWarpIntensity');
}
// This is called once each time the shader is used. This can be used to retrieve
// the configuration from the settings and update all uniforms accordingly.
beginAnimation(actor, settings, forOpening) {
super.beginAnimation(actor, settings, forOpening);
const c =
Clutter.Color.from_string(settings.get_string('claw-scratch-color'))[1];
// If we are currently performing integration test, the animation uses a fixed
// seed.
const testMode = settings.get_boolean('test-mode');
// clang-format off
this.set_uniform_float(this._uFlashColor, 4, [c.red / 255, c.green / 255, c.blue / 255, c.alpha / 255]);
this.set_uniform_float(this._uSeed, 2, [testMode ? 0 : Math.random(), testMode ? 0 : Math.random()]);
this.set_uniform_float(this._uClawSize, 1, [settings.get_double('claw-scratch-scale')]);
this.set_uniform_float(this._uNumClaws, 1, [settings.get_int('claw-scratch-count')]);
this.set_uniform_float(this._uWarpIntensity, 1, [settings.get_double('claw-scratch-warp')]);
// clang-format on
}
// 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._effect._clawTexture.get_texture());
pipeline.set_uniform_1i(this._uClawTexture, 1);
super.vfunc_paint_target(node, paint_context);
}
});
}
// Finally, return a new instance of the shader class.
return new this._ShaderClass(this);
}
}