// The MIT License // Copyright © 2021 IWBTShyGuy precision highp float; uniform vec2 resolution; uniform float time; uniform vec2 mouse; uniform sampler2D backbuffer; uniform sampler2D channel0; uniform vec2 channelSize0; const float LAG = 2.0; bool isYELLOW(in vec4 col) { return col.x > 0.5 && col.y > 0.5 && col.z < 0.1; } bool isBLUE(in vec4 col) { return col.x < 0.2 && col.y < 0.2 && col.z > 0.5; } bool isPURPLE(in vec4 col) { return col.x > 0.5 && col.y < 0.2 && col.z > 0.5; } bool isWHITE(in vec4 col) { return col.x > 0.6 && col.y > 0.6 && col.z > 0.6; } void saveYELLOWStorage(out vec4 fragColor, in vec2 uv) { float dt = 1.0 / channelSize0.y; for (int i = 0; i < 630; i++) { uv.y -= dt; vec4 col = texture2D(channel0, uv); if (isYELLOW(col)) { fragColor = col; return; } } fragColor = vec4(vec3(0.0), 1.0); } void saveWHITEStorage(out vec4 fragColor, in vec2 uv) { float dt = 1.0 / channelSize0.y; for (int i = 0; i < 630; i++) { uv.y += dt; vec4 col = texture2D(channel0, uv); if (isWHITE(col)) { fragColor = col; return; } } fragColor = vec4(vec3(0.0), 1.0); } void initLettersWidth(out vec4 fragColor, in vec2 fragCoord) { vec2 uv = fragCoord / resolution.xy; if (uv.y > 0.99) { saveYELLOWStorage(fragColor, uv); return; } if (uv.y < 0.01) { saveWHITEStorage(fragColor, uv); return; } float casp = channelSize0.y / channelSize0.x; float asp = resolution.y / resolution.x; uv.y = (asp / casp) * uv.y - (asp - casp); if (uv.y < 0.0 || 1.0 < uv.y) fragColor = vec4(vec3(0.0), 1.0); else fragColor = texture2D(channel0, uv); } void getYELLOWLetterWidth(out float left, out float right, in float x) { float dt = 1.0 / channelSize0.x; for (int i = 0; i < 1200; i++) { left = float(i) * dt; vec2 uv = vec2(x - left, 0.995); if (!isYELLOW(texture2D(backbuffer, uv))) break; } for (int i = 0; i < 1200; i++) { right = float(i) * dt; vec2 uv = vec2(x + right, 0.995); if (!isYELLOW(texture2D(backbuffer, uv))) break; } } void rotateYELLOW(out vec4 fragColor, in vec2 fragCoord) { vec2 uv = fragCoord / resolution.xy; vec4 col = texture2D(backbuffer, vec2(uv.x, 0.995)); if (isYELLOW(col)) { float casp = channelSize0.y / channelSize0.x; float asp = resolution.y / resolution.x; uv.y = (asp / casp) * uv.y - (asp - casp); float left, right; getYELLOWLetterWidth(left, right, uv.x); float width = right + left; float center = uv.x - left + width / 2.0; float x = 2.0 * left / width - 1.0; if (abs(cos(time - LAG)) > 0.01) { x /= cos(time - LAG); if (abs(x) > 1.0) { uv.x -= left + 1.0 / channelSize0.x; } else { uv.x = x * (width / 2.0) + center; } fragColor = texture2D(channel0, uv); } } } void getWHITELetterWidth(out float left, out float right, in float x) { float dt = 1.0 / channelSize0.x; for (int i = 0; i < 1200; i++) { left = float(i) * dt; vec2 uv = vec2(x - left, 0.005); if (!isWHITE(texture2D(backbuffer, uv))) break; } for (int i = 0; i < 1200; i++) { right = float(i) * dt; vec2 uv = vec2(x + right, 0.005); if (!isWHITE(texture2D(backbuffer, uv))) break; } } void rotateWHITE(out vec4 fragColor, in vec2 fragCoord) { vec2 uv = fragCoord / resolution.xy; vec4 col = texture2D(backbuffer, vec2(uv.x, 0.005)); if (isWHITE(col)) { float casp = channelSize0.y / channelSize0.x; float asp = resolution.y / resolution.x; uv = vec2(uv.x, (asp / casp) * uv.y - (asp - casp)); float left, right; getWHITELetterWidth(left, right, uv.x); float width = right + left; float center = uv.x - left + width / 2.0; float x = 2.0 * left / width - 1.0; float phase = 2.0 * (time - LAG) - 3.0 * center; if (abs(cos(phase)) > 0.01) { x /= cos(phase); if (abs(x) > 1.0) { uv.x -= left + 1.0 / channelSize0.x; } else { uv.x = x * (width / 2.0) + center; } fragColor = texture2D(channel0, uv); } } } void main() { if (time < LAG) { initLettersWidth(gl_FragColor, gl_FragCoord.xy); return; } vec2 uv = gl_FragCoord.xy / resolution.xy; gl_FragColor = texture2D(backbuffer, uv); if (uv.y > 0.99 || uv.y < 0.01) return; float casp = channelSize0.y / channelSize0.x; float asp = resolution.y / resolution.x; vec2 st = vec2(uv.x, (asp / casp) * uv.y - (asp - casp)); if (st.y < 0.0 || 1.0 < st.y) return; if (st.y > 0.4) rotateYELLOW(gl_FragColor, gl_FragCoord.xy); else rotateWHITE(gl_FragColor, gl_FragCoord.xy); if (!isYELLOW(gl_FragColor) && !isWHITE(gl_FragColor)) gl_FragColor = texture2D(channel0, vec2(0.01, st.y)); }

Typography?