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Fix northern lights rendering on OS Window resize

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Kovid Goyal 2026-08-14 16:07:07 +05:30
parent 1b0c1d0a0c
commit b71ef95ec7
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GPG key ID: 06BC317B515ACE7C
1 changed files with 8 additions and 4 deletions
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12
kitty/shaders/custom/northern-lights.slang
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@ -459,6 +459,10 @@ fragment_main(float4 color, KittyTextures t, KittyCustomShaderData d) {
float timestamp = fmod(d.timestamp, 86400.0f) * TIME_SCALE;
float2 uv = t.pos;
// d.src_rect.zy = (sx, sy) = (vw/W, vh/H): fraction of the shared texture used by this viewport.
// Named textures (a, persist) and the backbuffer span the full W×H texture, so we must scale
// t.pos back to raw texture UV when sampling them, otherwise we read outside the valid region.
float2 tex_uv = uv * d.src_rect.zy;
float aspect = pixelDims.x / max(pixelDims.y, 1.0f);
float2 mouseUV = (d.mouse_pos.xy - t.viewport.xy) / max(t.viewport.zw, float2(1e-5f, 1e-5f));
@ -468,7 +472,7 @@ fragment_main(float4 color, KittyTextures t, KittyCustomShaderData d) {
// First group: Accumulate radial aurora rays cast from sky center into scratch texture 'a'
if (STAGE == 0) {
float prev = t.persist.Sample(uv).r;
float prev = t.persist.Sample(tex_uv).r;
float decayed = prev * saturate(1.0f - ACCUMULATION_DECAY);
float deposit = 0.0f;
@ -509,7 +513,7 @@ fragment_main(float4 color, KittyTextures t, KittyCustomShaderData d) {
}
// Second group: Copy scratch texture 'a' to 'persist'
if (STAGE == 1) { return t.a.Sample(uv); }
if (STAGE == 1) { return t.a.Sample(tex_uv); }
// Third group: Main composite pass
AuroraRandParams rp = getAuroraParams(d.timestamp, INITIAL_RANDOM_SEED);
@ -518,7 +522,7 @@ fragment_main(float4 color, KittyTextures t, KittyCustomShaderData d) {
float2 fragCoord = uv * pixelDims;
float persistentTrail = t.persist.Sample(uv).r * MOUSE_PERSIST_INTENSITY;
float persistentTrail = t.persist.Sample(tex_uv).r * MOUSE_PERSIST_INTENSITY;
float3 ro = float3(0.0f, 0.0f, -CAMERA_DISTANCE);
float2 centeredUV = uv - 0.5f;
@ -558,7 +562,7 @@ fragment_main(float4 color, KittyTextures t, KittyCustomShaderData d) {
float gate = smoothCutoff(effectLum, EFFECT_FLOOR, EFFECT_CEILING);
col *= gate;
float4 terminalColor = t.backbuffer.Sample(t.pos);
float4 terminalColor = t.backbuffer.Sample(tex_uv);
float termLum = dot(terminalColor.rgb, float3(0.299f, 0.587f, 0.114f));
float isBlack = step(termLum, 0.001f);
float textPreserve = 1.0f - smoothstep(BLACK_BLEND_THRESHOLD, BLACK_BLEND_THRESHOLD + 0.2f, termLum);