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Fix custom shader scaling when OS Window size changes

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Kovid Goyal 2026-08-12 14:31:24 +05:30
parent 3e48e0dfe2
commit 7caf73ba1b
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GPG key ID: 06BC317B515ACE7C
2 changed files with 7 additions and 2 deletions
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7
kitty/shaders/custom/pipeline.slang
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@ -65,7 +65,12 @@ public float4
pipeline_fragment_main(float2 backbuffer_pos, int group, float4 viewport, float animation_progress, bool convert_to_srgb) {
float4 color = backbuffer.Sample(backbuffer_pos); // pre multiplied linear RGB
color = float4(color.rgb / color.a, color.a); // un pre multiplied color passed through pipeline
KittyTextures t = { backbuffer, a, b, persist, backbuffer_pos, viewport, animation_progress, group };
// src_rect encodes (0, sy, sx, 0) — the fraction of the shared texture occupied by the current
// viewport. Normalize backbuffer_pos so that t.pos is always in [0,1] viewport UV regardless of
// whether the shared texture is larger than the current viewport (e.g. after a window shrink).
float2 src_scale = float2(max(1e-6, csd.src_rect[right]), max(1e-6, csd.src_rect[top]));
float2 viewport_pos = backbuffer_pos / src_scale;
KittyTextures t = { backbuffer, a, b, persist, viewport_pos, viewport, animation_progress, group };
// PIPELINE
return vec4_premul(color.rgb, color.a);
}

2
kitty/shaders/custom/types.slang
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@ -84,7 +84,7 @@ public struct KittyTextures {
public Sampler2D b;
public Sampler2D persist;
public float2 pos; // the position of this pixel in the textures (UV coordinates)
public float2 pos; // the position of this pixel in the viewport (UV coordinates, [0,1] range, origin at bottom-left)
// Some group related uniforms