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Add bloom custom shader

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Kovid Goyal 2026-08-05 14:55:25 +05:30
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#language slang 2026
// Copyright (C) 2026 Kovid Goyal <kovid at kovidgoyal.net>
// Distributed under terms of the GPLv3 license.
//
// Original shader: https://gist.github.com/qwerasd205/c3da6c610c8ffe17d6d2d3cc7068f17f
// Credits: https://github.com/qwerasd205
// Bloom effect using golden spiral sample pattern.
import kitty_custom_shader_types;
// Golden spiral samples [x, y, weight] — weight is inverse of distance
static const float3 samples[24] = {
float3(0.1693761725038636, 0.9855514761735895, 1.0),
float3(-1.333070830962943, 0.4721463328627773, 0.7071067811865475),
float3(-0.8464394909806497, -1.51113870578065, 0.5773502691896258),
float3(1.554155680728463, -1.2588090085709776, 0.5),
float3(1.681364377589461, 1.4741145918052656, 0.4472135954999579),
float3(-1.2795157692199817, 2.088741103228784, 0.4082482904638631),
float3(-2.4575847530631187, -0.9799373355024756, 0.3779644730092272),
float3(0.5874641440200847, -2.7667464429345077, 0.35355339059327373),
float3(2.997715703369726, 0.11704939884745152, 0.3333333333333333),
float3(0.41360842451688395, 3.1351121305574803, 0.31622776601683794),
float3(-3.167149933769243, 0.9844599011770256, 0.30151134457776363),
float3(-1.5736713846521535, -3.0860263079123245, 0.2886751345948129),
float3(2.888202648340422, -2.1583061557896213, 0.2773500981126146),
float3(2.7150778983300325, 2.5745586041105715, 0.2672612419124244),
float3(-2.1504069972377464, 3.2211410627650165, 0.2581988897471611),
float3(-3.6548858794907493, -1.6253643308191343, 0.25),
float3(1.0130775986052671, -3.9967078676335834, 0.24253562503633297),
float3(4.229723673607257, 0.33081361055181563, 0.23570226039551587),
float3(0.40107790291173834, 4.340407413572593, 0.22941573387056174),
float3(-4.319124570236028, 1.159811599693438, 0.22360679774997896),
float3(-1.9209044802827355, -4.160543952132907, 0.2182178902359924),
float3(3.8639122286635708, -2.6589814382925123, 0.21320071635561041),
float3(3.3486228404946234, 3.4331800232609, 0.20851441405707477),
float3(-2.8769733643574344, 3.9652268864187157, 0.20412414523193154)
};
// minimum luminance for a pixel to contribute bloom
extern static const float bloom_threshold = 0.2f;
// strength of the bloom contribution
extern static const float bloom_strength = 0.2f;
float lum(float4 c) {
return 0.299f * c.r + 0.587f * c.g + 0.114f * c.b;
}
public float4 fragment_main(
float4 color,
KittyTextures t,
KittyCustomShaderData d,
float4 viewport
) {
float2 uv = t.pos;
// One pixel in backbuffer UV space; scale by sqrt(2) to match original step
float2 step = float2(1.414f) / float2(d.viewport_size_pixels);
float4 result = color;
[ForceUnroll]
for (int i = 0; i < 24; i++) {
float3 s = samples[i];
float4 sc = t.backbuffer.Sample(uv + s.xy * step);
float l = lum(sc);
result += (float4)(l * s.z * sc * bloom_strength) * ::step(bloom_threshold, l);
}
return result;
}