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breezy-desktop/gnome/src/virtualdisplayeffect.js

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const Clutter = imports.gi.Clutter;
const Cogl = imports.gi.Cogl;
const GLib = imports.gi.GLib;
const GObject = imports.gi.GObject;
const Shell = imports.gi.Shell;
const ExtensionUtils = imports.misc.extensionUtils;
const Me = ExtensionUtils.getCurrentExtension();
const Globals = Me.imports.globals;
const { degreeToRadian, diagonalToCrossFOVs } = Me.imports.math;
// these need to mirror the values in XRLinuxDriver
// https://github.com/wheaney/XRLinuxDriver/blob/main/src/plugins/smooth_follow.c#L31
var SMOOTH_FOLLOW_SLERP_TIMELINE_MS = 1000;
const SMOOTH_FOLLOW_SLERP_FACTOR = Math.pow(1-0.999, 1/SMOOTH_FOLLOW_SLERP_TIMELINE_MS);
// this mirror's how the driver's slerp function progresses so our effect will match it
function smoothFollowSlerpProgress(elapsedMs) {
return 1 - Math.pow(SMOOTH_FOLLOW_SLERP_FACTOR, elapsedMs);
}
// how far to look ahead is how old the IMU data is plus a constant that is either the default for this device or an override
function lookAheadMS(imuDateMs, lookAheadCfg, override) {
// how stale the imu data is
const dataAge = Date.now() - imuDateMs;
return (override === -1 ? lookAheadCfg[0] : override) + dataAge;
}
var VirtualDisplayEffect = GObject.registerClass({
Properties: {
'monitor-index': GObject.ParamSpec.int(
'monitor-index',
'Monitor Index',
'Index of the monitor that this effect is applied to',
GObject.ParamFlags.READWRITE,
0, 100, 0
),
'monitor-placements': GObject.ParamSpec.jsobject(
'monitor-placements',
'Monitor Placements',
'Target and virtual monitor placement details, as relevant to rendering',
GObject.ParamFlags.READWRITE
),
'target-monitor': GObject.ParamSpec.jsobject(
'target-monitor',
'Target Monitor',
'Details about the monitor being used as a viewport',
GObject.ParamFlags.READWRITE
),
'imu-snapshots': GObject.ParamSpec.jsobject(
'imu-snapshots',
'IMU Snapshots',
'Latest IMU quaternion snapshots and epoch timestamp for when it was collected',
GObject.ParamFlags.READWRITE
),
'smooth-follow-enabled': GObject.ParamSpec.boolean(
'smooth-follow-enabled',
'Smooth follow enabled',
'Whether smooth follow is enabled',
GObject.ParamFlags.READWRITE,
false
),
'smooth-follow-toggle-epoch-ms': GObject.ParamSpec.uint64(
'smooth-follow-toggle-epoch-ms',
'Smooth follow toggle epoch time',
'ms since epoch when smooth follow was toggled',
GObject.ParamFlags.READWRITE,
0, Number.MAX_SAFE_INTEGER, 0
),
'width': GObject.ParamSpec.int(
'width',
'Width',
'Width of the viewport',
GObject.ParamFlags.READWRITE,
1, 10000, 1920
),
'height': GObject.ParamSpec.int(
'height',
'Height',
'Height of the viewport',
GObject.ParamFlags.READWRITE,
1, 10000, 1080
),
'focused-monitor-index': GObject.ParamSpec.int(
'focused-monitor-index',
'Focused Monitor Index',
'Index of the monitor that is currently focused',
GObject.ParamFlags.READWRITE,
-1, 100, -1
),
'display-zoom-on-focus': GObject.ParamSpec.boolean(
'display-zoom-on-focus',
'Display zoom on focus',
'Automatically move a display closer when it becomes focused.',
GObject.ParamFlags.READWRITE,
true
),
'display-distance': GObject.ParamSpec.double(
'display-distance',
'Display Distance',
'Distance of the display from the camera',
GObject.ParamFlags.READWRITE,
0.0,
2.5,
1.0
),
'display-distance-default': GObject.ParamSpec.double(
'display-distance-default',
'Display distance default',
'Distance to use when not explicitly set, or when reset',
GObject.ParamFlags.READWRITE,
0.2,
2.5,
1.0
),
'show-banner': GObject.ParamSpec.boolean(
'show-banner',
'Show banner',
'Whether the banner should be displayed',
GObject.ParamFlags.READWRITE,
false
),
'lens-vector': GObject.ParamSpec.jsobject(
'lens-vector',
'Lens Vector',
'Vector representing the offset of the lens from the pivot point',
GObject.ParamFlags.READWRITE
),
'actor-to-display-ratios': GObject.ParamSpec.jsobject(
'actor-to-display-ratios',
'Actor to Display Ratios',
'Ratios to convert actor coordinates to display coordinates',
GObject.ParamFlags.READWRITE
),
'actor-to-display-offsets': GObject.ParamSpec.jsobject(
'actor-to-display-offsets',
'Actor to Display Offsets',
'Offsets to convert actor coordinates to display coordinates',
GObject.ParamFlags.READWRITE
),
'is-closest': GObject.ParamSpec.boolean(
'is-closest',
'Is Closest',
'Whether this monitor is the closest to the camera',
GObject.ParamFlags.READWRITE,
false
),
'disable-anti-aliasing': GObject.ParamSpec.boolean(
'disable-anti-aliasing',
'Disable anti-aliasing',
'Disable anti-aliasing for the effect',
GObject.ParamFlags.READWRITE,
false
),
'look-ahead-override': GObject.ParamSpec.int(
'look-ahead-override',
'Look ahead override',
'Override the look ahead value',
GObject.ParamFlags.READWRITE,
-1,
45,
-1
),
}
}, class VirtualDisplayEffect extends Shell.GLSLEffect {
constructor(params = {}) {
super(params);
this._current_display_distance = this._is_focused() ? this.display_distance : this.display_distance_default;
this.no_distance_ease = false;
this._current_follow_ease_progress = 0.0;
this._use_smooth_follow_origin = false;
this.connect('notify::display-distance', this._update_display_distance.bind(this));
this.connect('notify::focused-monitor-index', this._update_display_distance.bind(this));
this.connect('notify::monitor-placements', this._update_display_position_uniforms.bind(this));
this.connect('notify::monitor-wrapping-scheme', this._update_display_position_uniforms.bind(this));
this.connect('notify::show-banner', this._handle_banner_update.bind(this));
this.connect('notify::smooth-follow-enabled', this._handle_smooth_follow_enabled_update.bind(this));
}
_is_focused() {
return this.focused_monitor_index === this.monitor_index;
}
_update_display_distance() {
const desired_distance = this._is_focused() ? this.display_distance : this.display_distance_default;
if (this._distance_ease_timeline?.is_playing()) {
// we're already easing towards the desired distance, do nothing
if (this._distance_ease_target === desired_distance) return;
this._distance_ease_timeline.stop();
}
if (this.no_distance_ease) {
this._current_display_distance = desired_distance;
this._update_display_position_uniforms();
this.no_distance_ease = false;
return;
}
// if we're the focused display, we'll double the timeline and wait for the first half to let other
// displays ease out first
this._distance_ease_focus = this._is_focused();
const ease_out_timeline_ms = 150;
const pause_ms = 50;
const ease_in_timeline_ms = 500; // includes ease out and pause
const ease_in_begin_pct = (ease_out_timeline_ms + pause_ms) / ease_in_timeline_ms;
const timeline_ms = this._distance_ease_focus ?
ease_in_timeline_ms :
ease_out_timeline_ms;
this._distance_ease_start = this._current_display_distance;
this._distance_ease_timeline = Clutter.Timeline.new_for_actor(this.get_actor(), timeline_ms);
this._distance_ease_target = desired_distance;
this._distance_ease_timeline.connect('new-frame', (() => {
let progress = this._distance_ease_timeline.get_progress();
if (this._distance_ease_focus) {
// if we're the focused display, wait for the first half of the timeline to pass
if (progress < ease_in_begin_pct) return;
// treat the second half of the timeline as its own full progression
progress = (progress - ease_in_begin_pct) / (1 - ease_in_begin_pct);
// put this display in front as it starts to easy in
this.is_closest = true;
} else {
this.is_closest = false;
}
this._current_display_distance = this._distance_ease_start +
(1 - Math.cos(progress * Math.PI)) / 2 * (this._distance_ease_target - this._distance_ease_start);
this._update_display_position_uniforms();
}).bind(this));
this._distance_ease_timeline.start();
if (this.smooth_follow_enabled) this._handle_smooth_follow_enabled_update();
}
_handle_smooth_follow_enabled_update() {
// we'll re-trigger this once a monitor becomes focused
if (this.focused_monitor_index === -1) return;
this._use_smooth_follow_origin = false;
if (this._follow_ease_timeline?.is_playing()) this._follow_ease_timeline.stop();
const from = this._current_follow_ease_progress;
const to = this.smooth_follow_enabled && this._is_focused() ? 1.0 : 0.0;
const toggleTime = this.smooth_follow_toggle_epoch_ms === 0 ? Date.now() : this.smooth_follow_toggle_epoch_ms;
// would have been a slight delay between request and slerp actually starting
const toggleDelayMs = (Date.now() - toggleTime) * 0.75;
const slerpStartTime = toggleTime + toggleDelayMs;
if (to !== from) {
this._follow_ease_timeline = Clutter.Timeline.new_for_actor(
this.get_actor(),
SMOOTH_FOLLOW_SLERP_TIMELINE_MS - toggleDelayMs
);
this._follow_ease_timeline.connect('new-frame', ((timeline, elapsed_ms) => {
const toggleTimeOffsetMs = Date.now() - slerpStartTime;
// this relies on the slerp function tuned to reach 100% in about 1 second
const progress = smoothFollowSlerpProgress(toggleTimeOffsetMs);
this._current_follow_ease_progress = from + (to - from) * progress;
this._update_display_position_uniforms();
}).bind(this));
this._follow_ease_timeline.connect('completed', (() => {
this._current_follow_ease_progress = to;
this._use_smooth_follow_origin = false;
this.smooth_follow_toggle_epoch_ms = 0;
this._update_display_position_uniforms();
}).bind(this));
this._follow_ease_timeline.start();
} else if (!this.smooth_follow_enabled) {
// smooth follow has been turned off and this screen wasn't the focus,
// continue to use the smooth_follow_origin data for 1 more second
this._use_smooth_follow_origin = true;
GLib.timeout_add(
GLib.PRIORITY_DEFAULT,
SMOOTH_FOLLOW_SLERP_TIMELINE_MS - toggleDelayMs,
(() => {
this._use_smooth_follow_origin = false;
this.smooth_follow_toggle_epoch_ms = 0;
this._current_follow_ease_progress = to;
return GLib.SOURCE_REMOVE;
}).bind(this)
);
}
}
// follow_ease transitions this from a rotated display (0.0) to a centered/focused display (1.0)
_update_display_position_uniforms() {
// this is in NWU coordinates
const monitorPlacement = this.monitor_placements[this.monitor_index];
// use the center vector with the distance applied to determine how much to move each coordinate, so they all move uniformly
const inverseAppliedDistance = 1.0 - this._current_display_distance / this.display_distance_default;
const distanceDelta = monitorPlacement.centerNoRotate.map(coord => coord * inverseAppliedDistance);
const noRotationVector = monitorPlacement.topLeftNoRotate.map((coord, index) => coord - distanceDelta[index]);
// convert to CoGL's east-down-south coordinates and apply display distance
const inverse_follow_ease = 1.0 - this._current_follow_ease_progress;
if (this._current_follow_ease_progress === 0.0) {
this.set_uniform_float(this.get_uniform_location("u_display_position"), 3,
[-noRotationVector[1], -noRotationVector[2], -noRotationVector[0]]);
} else {
const focusDistanceNorth = monitorPlacement.centerOrigin[0] * inverseAppliedDistance;
const centerOriginVector = {...monitorPlacement.centerOrigin};
centerOriginVector[0] -= focusDistanceNorth;
// slerp from the rotated display to the centered display
const followVector = noRotationVector.map((coord, index) => coord * inverse_follow_ease + centerOriginVector[index] * this._current_follow_ease_progress);
this.set_uniform_float(this.get_uniform_location("u_display_position"), 3,
[-followVector[1], -followVector[2], -followVector[0]]);
}
const rotation_radians = this.monitor_placements[this.monitor_index].rotationAngleRadians;
this.set_uniform_float(this.get_uniform_location("u_rotation_x_radians"), 1, [rotation_radians.x * inverse_follow_ease]);
this.set_uniform_float(this.get_uniform_location("u_rotation_y_radians"), 1, [rotation_radians.y * inverse_follow_ease]);
}
_handle_banner_update() {
this.set_uniform_float(this.get_uniform_location("u_show_banner"), 1, [this.show_banner ? 1.0 : 0.0]);
}
perspective(fovHorizontalRadians, aspect, near, far) {
const f = 1.0 / Math.tan(fovHorizontalRadians / 2.0);
const range = far - near;
return [
f / aspect, 0, 0, 0,
0, f, 0, 0,
0, 0, - (far + near) / range, -1,
0, 0, - (2.0 * near * far) / range, 0
];
}
vfunc_build_pipeline() {
const declarations = `
uniform bool u_show_banner;
uniform mat4 u_imu_data;
uniform float u_look_ahead_ms;
uniform vec4 u_look_ahead_cfg;
uniform mat4 u_projection_matrix;
uniform float u_fov_vertical_radians;
uniform vec3 u_display_position;
uniform float u_rotation_x_radians;
uniform float u_rotation_y_radians;
uniform vec2 u_display_resolution;
uniform vec3 u_lens_vector;
// vector positions are relative to the width and height of the entire stage
uniform vec2 u_actor_to_display_ratios;
uniform vec2 u_actor_to_display_offsets;
// discovered through trial and error, no idea the significance
float cogl_position_mystery_factor = 29.09 * 2;
float look_ahead_ms_cap = 45.0;
vec4 quatConjugate(vec4 q) {
return vec4(-q.xyz, q.w);
}
vec3 applyQuaternionToVector(vec3 v, vec4 q) {
vec3 t = 2.0 * cross(q.xyz, v);
return v + q.w * t + cross(q.xyz, t);
}
vec3 applyXRotationToVector(vec3 v, float angle) {
float c = cos(angle);
float s = sin(angle);
return vec3(v.x, v.y * c - v.z * s, v.y * s + v.z * c);
}
vec3 applyYRotationToVector(vec3 v, float angle) {
float c = cos(angle);
float s = sin(angle);
return vec3(v.x * c + v.z * s, v.y, v.z * c - v.x * s);
}
vec4 nwuToESU(vec4 v) {
return vec4(-v.y, v.z, -v.x, v.w);
}
// returns the rate of change between the two vectors, in same time units as delta_time
// e.g. if delta_time is in ms, then the rate of change is "per ms"
vec3 rateOfChange(vec3 v1, vec3 v2, float delta_time) {
return (v1-v2) / delta_time;
}
// attempt to figure out where the current position should be based on previous position and velocity.
// velocity and time values should use the same time units (secs, ms, etc...)
vec3 applyLookAhead(vec3 position, vec3 velocity, float look_ahead_ms) {
return position + velocity * look_ahead_ms;
}
// project the vector onto a flat surface, return it's vertical position relative to the vertical fov, where 0.0 is
// the top and 1.0 is the bottom. vectors that project outside the vertical range of the display will have values
// outside this range, but capped
float vectorToScanline(float fovVerticalRadians, vec3 v) {
return clamp(1.0 - (-v.y / (tan(fovVerticalRadians / 2.0) * v.z) + 1.0) / 2.0, -1.5, 2.5);
}
`;
const main = `
vec4 world_pos = cogl_position_in;
if (!u_show_banner) {
float aspect_ratio = u_display_resolution.x / u_display_resolution.y;
float cogl_position_width = cogl_position_mystery_factor * aspect_ratio / u_actor_to_display_ratios.y;
float cogl_position_height = cogl_position_width / aspect_ratio;
float pos_z_factor = aspect_ratio / u_actor_to_display_ratios.y;
vec3 pos_factors = vec3(
cogl_position_width / u_display_resolution.x,
cogl_position_height / u_display_resolution.y,
cogl_position_mystery_factor * pos_z_factor / u_display_resolution.x
);
world_pos.x -= u_display_position.x * pos_factors.x;
world_pos.y -= u_display_position.y * pos_factors.y;
world_pos.z = u_display_position.z * pos_factors.z;
// if the perspective includes more than just our viewport actor, move vertices towards the center of the perspective so they'll be properly rotated
world_pos.x += u_actor_to_display_offsets.x * cogl_position_width / 2;
world_pos.y -= u_actor_to_display_offsets.y * cogl_position_height / 2;
vec3 complete_vector = applyXRotationToVector(world_pos.xyz, u_rotation_x_radians);
complete_vector = applyYRotationToVector(complete_vector, u_rotation_y_radians);
vec4 quat_t0 = nwuToESU(quatConjugate(u_imu_data[0]));
vec3 rotated_vector_t0 = applyQuaternionToVector(complete_vector, quat_t0);
vec3 rotated_vector_t1 = applyQuaternionToVector(complete_vector, nwuToESU(quatConjugate(u_imu_data[1])));
float delta_time_t0 = u_imu_data[3][0] - u_imu_data[3][1];
vec3 velocity_t0 = rateOfChange(rotated_vector_t0, rotated_vector_t1, delta_time_t0);
// compute the capped look ahead with scanline adjustments
float look_ahead_scanline_ms = u_look_ahead_ms == 0.0 ? 0.0 : vectorToScanline(u_fov_vertical_radians, rotated_vector_t0) * u_look_ahead_cfg[2];
float effective_look_ahead_ms = min(min(u_look_ahead_ms, look_ahead_ms_cap), u_look_ahead_cfg[3]) + look_ahead_scanline_ms;
vec3 look_ahead_vector = applyLookAhead(rotated_vector_t0, velocity_t0, effective_look_ahead_ms);
vec3 adjusted_lens_vector = u_lens_vector * pos_factors;
world_pos = vec4(look_ahead_vector - adjusted_lens_vector, world_pos.w);
world_pos.z /= pos_z_factor;
world_pos.x *= u_actor_to_display_ratios.y / u_actor_to_display_ratios.x;
world_pos = u_projection_matrix * world_pos;
// if the perspective includes more than just our viewport actor, move the vertices back to just the area we can see.
// this needs to be done after the projection matrix multiplication so it will be projected as if centered in our vision
world_pos.x -= (u_actor_to_display_offsets.x / u_actor_to_display_ratios.x) * world_pos.w;
world_pos.y += (u_actor_to_display_offsets.y / u_actor_to_display_ratios.y) * world_pos.w;
} else {
world_pos = cogl_modelview_matrix * world_pos;
world_pos = cogl_projection_matrix * world_pos;
}
cogl_position_out = world_pos;
cogl_tex_coord_out[0] = cogl_tex_coord_in;
`
this.add_glsl_snippet(Cogl.SnippetHook?.VERTEX ?? Shell.SnippetHook.VERTEX, declarations, main, false);
}
vfunc_paint_target(node, paintContext) {
if (!this._initialized) {
const aspect = this.target_monitor.width / this.target_monitor.height;
const fovRadians = diagonalToCrossFOVs(degreeToRadian(Globals.data_stream.device_data.displayFov), aspect);
const projection_matrix = this.perspective(
fovRadians.horizontal,
aspect,
0.0001,
1000.0
);
this.set_uniform_matrix(this.get_uniform_location("u_projection_matrix"), false, 4, projection_matrix);
this.set_uniform_float(this.get_uniform_location("u_fov_vertical_radians"), 1, [fovRadians.vertical]);
this.set_uniform_float(this.get_uniform_location("u_display_resolution"), 2, [this.target_monitor.width, this.target_monitor.height]);
this.set_uniform_float(this.get_uniform_location("u_look_ahead_cfg"), 4, Globals.data_stream.device_data.lookAheadCfg);
this.set_uniform_float(this.get_uniform_location("u_actor_to_display_ratios"), 2, this.actor_to_display_ratios);
this.set_uniform_float(this.get_uniform_location("u_actor_to_display_offsets"), 2, this.actor_to_display_offsets);
this.set_uniform_float(this.get_uniform_location("u_lens_vector"), 3, this.lens_vector);
this._update_display_position_uniforms();
this._handle_banner_update();
this._initialized = true;
}
let lookAheadSet = false;
if (!this._use_smooth_follow_origin && (!this.smooth_follow_enabled || this._is_focused() || this._current_follow_ease_progress > 0.0)) {
if (this._current_follow_ease_progress > 0.0 && this._current_follow_ease_progress < 1.0) {
// don't apply look-ahead while the display is slerping
this.set_uniform_float(this.get_uniform_location('u_look_ahead_ms'), 1, [0.0]);
lookAheadSet = true;
}
this.set_uniform_matrix(this.get_uniform_location("u_imu_data"), false, 4, this.imu_snapshots.imu_data);
} else {
this.set_uniform_matrix(this.get_uniform_location("u_imu_data"), false, 4, this.imu_snapshots.smooth_follow_origin);
}
if (!lookAheadSet) {
this.set_uniform_float(this.get_uniform_location('u_look_ahead_ms'), 1, [lookAheadMS(this.imu_snapshots.timestamp_ms, Globals.data_stream.device_data.lookAheadCfg, this.look_ahead_override)]);
}
if (!this.disable_anti_aliasing) {
// improves sampling quality for smooth text and edges
this.get_pipeline().set_layer_filters(
0,
Cogl.PipelineFilter.LINEAR_MIPMAP_LINEAR,
Cogl.PipelineFilter.LINEAR
);
}
super.vfunc_paint_target(node, paintContext);
}
});
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