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Make smear cursor fade in, tweak some values, much less jarring now.

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This commit is contained in:
Martin Larsson 2025-07-15 12:51:36 +02:00
parent cca5c9f677
commit ae37074ce4
1 changed files with 20 additions and 10 deletions
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30
ghostty/shaders/cursor_smear.glsl
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@ -64,9 +64,10 @@ vec4 saturate(vec4 color, float factor) {
} }
vec4 TRAIL_COLOR = iCurrentCursorColor; vec4 TRAIL_COLOR = iCurrentCursorColor;
const float OPACITY = 0.325; const float OPACITY = 0.3;
const float DURATION = 0.2; //IN SECONDS const float DURATION = 0.3; //IN SECONDS
const float MAX_TRAIL_LENGTH = 0.6; const float FADE_DURATION = 0.3;
const float MAX_TRAIL_LENGTH = 0.4;
const float TRAIL_HEIGHT_FACTOR = 0.4; const float TRAIL_HEIGHT_FACTOR = 0.4;
void mainImage(out vec4 fragColor, in vec2 fragCoord) void mainImage(out vec4 fragColor, in vec2 fragCoord)
@ -84,11 +85,13 @@ void mainImage(out vec4 fragColor, in vec2 fragCoord)
vec4 currentCursor = vec4(normalize(iCurrentCursor.xy, 1.), normalize(iCurrentCursor.zw, 0.)); vec4 currentCursor = vec4(normalize(iCurrentCursor.xy, 1.), normalize(iCurrentCursor.zw, 0.));
vec4 previousCursor = vec4(normalize(iPreviousCursor.xy, 1.), normalize(iPreviousCursor.zw, 0.)); vec4 previousCursor = vec4(normalize(iPreviousCursor.xy, 1.), normalize(iPreviousCursor.zw, 0.));
// Calculate time since last cursor move for fade effect
float timeSinceMove = iTime - iTimeCursorChange;
// When drawing between cursors for the trail we need to determine the direction // When drawing between cursors for the trail we need to determine the direction
float vertexFactor = determineStartVertexFactor(currentCursor.xy, previousCursor.xy); float vertexFactor = determineStartVertexFactor(currentCursor.xy, previousCursor.xy);
float invertedVertexFactor = 1.0 - vertexFactor; float invertedVertexFactor = 1.0 - vertexFactor;
// Calculate centers first for both cursors
vec2 centerCC = getRectangleCenter(currentCursor); vec2 centerCC = getRectangleCenter(currentCursor);
vec2 centerCP = getRectangleCenter(previousCursor); vec2 centerCP = getRectangleCenter(previousCursor);
@ -125,23 +128,30 @@ void mainImage(out vec4 fragColor, in vec2 fragCoord)
float sdfCurrentCursor = getSdfRectangle(vu, currentCursor.xy - (currentCursor.zw * offsetFactor), currentCursor.zw * 0.5); float sdfCurrentCursor = getSdfRectangle(vu, currentCursor.xy - (currentCursor.zw * offsetFactor), currentCursor.zw * 0.5);
float sdfTrail = getSdfTriangle(vu, v0, v1, v2); float sdfTrail = getSdfTriangle(vu, v0, v1, v2);
float progress = clamp((iTime - iTimeCursorChange) / DURATION, 0.0, 1.0); // Separate progress calculations for trail animation and fade
float progress = clamp(timeSinceMove / DURATION, 0.0, 1.0);
float easedProgress = ease(progress); float easedProgress = ease(progress);
float fadeProgress = clamp(timeSinceMove / FADE_DURATION, 0.0, 1.0);
float easedFadeProgress = ease(fadeProgress);
// Calculate fade-in opacity (starts at OPACITY, fades to 0)
float fadeOpacity = (1.0 - easedFadeProgress) * OPACITY;
vec4 newColor = vec4(fragColor); vec4 newColor = vec4(fragColor);
vec4 trail = TRAIL_COLOR; vec4 trail = TRAIL_COLOR;
trail = saturate(trail, 2.5); trail = saturate(trail, 2.5);
trail.a *= OPACITY; // Apply transparency to the trail trail.a *= fadeOpacity; // Apply fading transparency to the trail
// Draw trail with transparency // Draw trail with fading transparency
float trailMask = antialising(sdfTrail); float trailMask = antialising(sdfTrail);
newColor = mix(newColor, trail, trailMask * OPACITY); newColor = mix(newColor, trail, trailMask * fadeOpacity);
// Draw current cursor // Draw current cursor
newColor = mix(newColor, trail, antialising(sdfCurrentCursor)); newColor = mix(newColor, trail, antialising(sdfCurrentCursor));
newColor = mix(newColor, fragColor, step(sdfCurrentCursor, 0.)); newColor = mix(newColor, fragColor, step(sdfCurrentCursor, 0.));
// Apply the trail effect with transparency // Apply the trail effect with fading transparency
fragColor = mix(fragColor, newColor, step(sdfCurrentCursor, easedProgress * cappedlinelength) * OPACITY); fragColor = mix(fragColor, newColor, step(sdfCurrentCursor, easedProgress * cappedlinelength) * fadeOpacity);
} }