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🔧 Tweak portal effect

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This commit is contained in:
Simon Schneegans
2022-12-22 19:58:06 +01:00
parent 4b6a76fbea
commit 41fbab48f6
6 changed files with 475 additions and 26 deletions
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resources/shaders/portal.frag
+22 -20
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@@ -14,28 +14,30 @@
// The content from common.glsl is automatically prepended to each shader effect.
uniform vec3 uColor;
uniform vec2 uSeed;
uniform vec3 uColor;
uniform float uRotationSpeed;
uniform float uWhirl;
uniform float uDetails;
const float PORTAL_OPEN_TIME = 0.3;
const float PORTAL_WOBBLE_TIME = 0.8;
const float PORTAL_WOBBLE_STRENGTH = 1.2;
const float PORTAL_CLOSE_TIME = 0.3;
const float PORTAL_ROTATION_SPEED = 0.3;
const float PORTAL_WARPING = 3.0;
const float GLOW_EDGE_WIDTH = 5.0;
const float WINDOW_ANIMATION_TIME = 0.3;
const float WINDOW_SCALE = 0.3;
const float WINDOW_SQUISH = 1.0;
const float WINDOW_TILT = -1.0;
const float WINDOW_SCALE = 0.3;
const float WINDOW_SQUISH = 1.0;
const float WINDOW_TILT = -1.0;
float PORTAL_OPEN_TIME = 0.3 * 1.5 / uDuration;
float PORTAL_CLOSE_TIME = 0.3 * 1.5 / uDuration;
float WINDOW_OPEN_TIME = 0.3 * 1.5 / uDuration;
// This will distort the given coordinate to achieve the wobble effect of the portal when
// the window passes through. The wobble happens around the point where the window appears
// or disappears (which is controlled by WINDOW_ANIMATION_TIME) and takes
// or disappears (which is controlled by WINDOW_OPEN_TIME) and takes
// PORTAL_WOBBLE_TIME.
vec2 getPortalWobble(vec2 coords) {
float progress = (uForOpening ? (1.0 - uProgress) : uProgress) / WINDOW_ANIMATION_TIME;
float progress = (uForOpening ? (1.0 - uProgress) : uProgress) / WINDOW_OPEN_TIME;
progress = clamp(1.0 - abs((progress - 1.0) / PORTAL_WOBBLE_TIME), 0.0, 1.0);
progress = easeInBack(progress, 1.7);
float dist = length(coords);
@@ -70,8 +72,8 @@ vec2 getRandomDisplace(vec2 seed, float scale) {
// twisting (higher multipliers will make coordinates which are closer to the origin be
// rotated more than coordinates farther away).
vec2 getWhirledCoords(vec2 coords, float speedMultiplier, float warpMultiplier) {
float rotation = PORTAL_ROTATION_SPEED * uProgress * uDuration * speedMultiplier;
float warping = PORTAL_WARPING * (2.0 + 0.5 * uProgress) * warpMultiplier;
float rotation = uRotationSpeed * uProgress * uDuration * speedMultiplier;
float warping = uWhirl * (6.0 + 1.5 * uProgress) * warpMultiplier;
return whirl(coords, warping, rotation);
}
@@ -101,13 +103,13 @@ vec4 getPortalColor() {
// This is used below to scale the detail level of the layers. If the portal is small,
// we want to have less details, if the portal is huge on the screen, theres plenty of
// space for details.
float detailScale = 1000.0 / (uSize.x + uSize.y);
float detailScale = 10000.0 / (uSize.x + uSize.y) / uDetails;
// ---------------------------------------------------------------------------- 1. layer
// We start with the background layer. This is a radial gradient from a dark color in
// the center to a not-so-dark color in the outer regions. We distort the coordinates to
// add some variations to the colors and to the shape of the portal.
vec2 layerCoords = getWhirledCoords(coords - wobble * 1.0, 0.5, 1.0);
vec2 layerCoords = getWhirledCoords(coords - wobble * 1.0, 0.25, 1.0);
vec2 displace = getRandomDisplace(layerCoords, 2.1);
layerCoords += displace * 0.1;
float dist = length(layerCoords);
@@ -124,7 +126,7 @@ vec4 getPortalColor() {
// ---------------------------------------------------------------------------- 3. layer
// The second layer of whirly bands uses a lighter color and a different set of
// distorted coordinates.
layerCoords = getWhirledCoords(coords - wobble * 1.5, 1.5, 0.5);
layerCoords = getWhirledCoords(coords - wobble * 1.5, 0.75, 0.5);
displace = getRandomDisplace(layerCoords, 12.2);
layerCoords += displace * 0.1;
noise = simplex2D(layerCoords / detailScale * 1.3 + uSeed);
@@ -145,9 +147,9 @@ vec4 getPortalColor() {
// ---------------------------------------------------------------------------- 5. layer
// Finally, we add some sparkling lights.
layerCoords = getWhirledCoords(coords - wobble * 1.8, 2.5, 0.0);
layerCoords = getWhirledCoords(coords - wobble * 1.8, 1.25, 0.0);
noise = simplex2D(layerCoords / detailScale * 3.0 + uSeed);
layer.rgb = lighten(uColor, 0.5) * clamp(pow(noise * rand + 0.9, 50.0), 0.0, 1.0);
layer.rgb = lighten(uColor, 0.8) * clamp(pow(noise * rand + 0.9, 50.0), 0.0, 1.0);
color.rgb += layer.rgb;
// Finally, fade in / out the portal when it appears / disappears.
@@ -160,9 +162,9 @@ vec4 getPortalColor() {
// animation will happen in a fraction of the full animation time (at the end of the
// animation when opening a window and at the beginning of the animation when closing the
// window). The fraction of the animation time take for the window animation is defined by
// WINDOW_ANIMATION_TIME.
// WINDOW_OPEN_TIME.
vec4 getWindowColor() {
float progress = (uForOpening ? (1.0 - uProgress) : uProgress) / WINDOW_ANIMATION_TIME;
float progress = (uForOpening ? (1.0 - uProgress) : uProgress) / WINDOW_OPEN_TIME;
// Add some elastic easing to make the effect more dynamic.
progress = easeInBack(clamp(progress, 0.0, 1.0), 1.2);