Skip to content

Instantly share code, notes, and snippets.

@zeh zeh/DreamyZoom.glsl forked from glslioadmin/TEMPLATE.glsl
Last active Aug 29, 2015

Embed
What would you like to do?
GLSL.io Transition (v1)
#ifdef GL_ES
precision highp float;
#endif
// Definitions --------
#define DEG2RAD 0.03926990816987241548078304229099 // 1/180*PI
// Hardcoded parameters --------
uniform sampler2D from, to;
uniform float progress;
uniform vec2 resolution;
// Transition parameters --------
// default rotation = 6
uniform float rotation; // In degrees
// default scale = 1.2
uniform float scale; // Multiplier
// The code proper --------
void main() {
// Massage parameters
float phase = progress < 0.5 ? progress * 2.0 : (progress - 0.5) * 2.0;
float angleOffset = progress < 0.5 ? mix(0.0, rotation * DEG2RAD, phase) : mix(-rotation * DEG2RAD, 0.0, phase);
float newScale = progress < 0.5 ? mix(1.0, scale, phase) : mix(scale, 1.0, phase);
vec2 center = vec2(0, 0);
// Calculate
float maxRes = max(resolution.x, resolution.y);
float resX = resolution.x / maxRes * 0.5;
float resY = resolution.y / maxRes * 0.5;
vec2 p = (gl_FragCoord.xy / maxRes - vec2(resX, resY)) / newScale;
// This can probably be optimized (with distance())
float angle = atan(p.y, p.x) + angleOffset;
float dist = distance(center, p);
p.x = cos(angle) * dist + resX;
p.y = sin(angle) * dist + resY;
vec4 c = progress < 0.5 ? texture2D(from, p) : texture2D(to, p);
// Finally, apply the color
gl_FragColor = c + (progress < 0.5 ? mix(0.0, 1.0, phase) : mix(1.0, 0.0, phase));
}
{"rotation":6,"scale":1.2}
GLSL.io Transition License (v1):
The MIT License (MIT)
Copyright (C) 2014 contact@glsl.io
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
THE SOFTWARE.
@gre

This comment has been minimized.

Copy link

gre commented May 28, 2014

Great job!
your transition works for the square rendering but there is some issue with the ratio (that you currently only see on the gallery).

Sign up for free to join this conversation on GitHub. Already have an account? Sign in to comment
You can’t perform that action at this time.