mirror of
https://github.com/boxpositron/absolute-dotfiles.git
synced 2026-02-28 03:30:37 +00:00
f7bd72184b
feat(shaders): add CRT-styled shader with public domain license and adjustments for Ghostty, including parameter definitions and tonal control functions. refactor(shader): optimize color conversion and output to SRGB for better visual quality feat(shaders): add flicker, glow, and starfield shader effects for terminal ambiance.
43 lines
1.4 KiB
GLSL
43 lines
1.4 KiB
GLSL
// https://github.com/12jihan/ghostty_shaders/blob/main/flicker.glsl
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float rand(vec2 co) {
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return fract(sin(dot(co.xy ,vec2(12.9898,78.233))) * 43758.5453);
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}
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void mainImage(out vec4 fragColor, in vec2 fragCoord) {
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vec2 uv = fragCoord/iResolution.xy;
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// Random timing for glitches
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float timeScale = floor(iTime * 2.0);
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float randomTrigger = step(0.52, rand(vec2(timeScale, 0.80)));
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// RGB Split with random intensity
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float splitStrength = randomTrigger * 0.20 * rand(vec2(timeScale, 2.0));
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float r = texture(iChannel0, vec2(uv.x + splitStrength, uv.y)).r;
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float g = texture(iChannel0, uv).g;
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float b = texture(iChannel0, vec2(uv.x - splitStrength, uv.y)).b;
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// Random vertical glitch blocks
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float blockNoise = rand(vec2(floor(uv.y * 32.0), timeScale));
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float blockOffset = (step(0.996, blockNoise) * 2.0 - 1.0) * 0.02;
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uv.x = uv.x + blockOffset * randomTrigger;
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// CRT scanlines
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float scanline = sin(uv.y * 1000.0) * 0.04 + 0.96;
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// Vertical sync glitch
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float vSync = sin(uv.y * 50.0 + iTime * 5.0) * randomTrigger * 0.01;
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uv.x += vSync;
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vec3 color = vec3(r, g, b);
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// Apply scanlines and noise
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color *= scanline;
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color *= (0.95 + rand(uv + timeScale) * 0.05);
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// Random color noise at glitch moments
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color += randomTrigger * rand(uv + iTime) * 0.01;
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fragColor = vec4(color, 0.95);
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}
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