added variable refresh rate support

background.go

@@ -18,20 +18,23 @@ var topColor = rl.Color{R: 0x20, G: 0x0F, B: 0x3C, A: 0xFF}      // #200F3C top
 var bottomColor = rl.Color{R: 0x3B, G: 0x0B, B: 0x42, A: 0xFF}   // #3B0B42 bottom
 var particleColor = rl.Color{R: 0xD4, G: 0xB0, B: 0xB5, A: 0x80} // D4B0B5 with some transparency
 
+var rng = rand.New(rand.NewSource(time.Now().UnixNano())) // Local RNG
+
 func InitBackground(width, height int) {
-	rand.Seed(time.Now().UnixNano())
 	particles = make([]Particle, 100)
 	for i := range particles {
-		particles[i].Pos = rl.Vector2{X: float32(rand.Intn(width)), Y: float32(rand.Intn(height))}
+		particles[i].Pos = rl.Vector2{X: float32(rng.Intn(width)), Y: float32(rng.Intn(height))}
-		particles[i].Vel = rl.Vector2{X: (rand.Float32() - 0.5) * 0.2, Y: (rand.Float32() - 0.5) * 0.2}
+		particles[i].Vel = rl.Vector2{X: (rng.Float32() - 0.5) * 0.2, Y: (rng.Float32() - 0.5) * 0.2}
-		particles[i].Size = rand.Float32()*1.5 + 0.5 // Particles size ~0.5-2.0
+		particles[i].Size = rng.Float32()*1.5 + 0.5 // Particles size ~0.5-2.0
 	}
 }
 
 func UpdateBackground(screenWidth, screenHeight int) {
+	deltaTime := rl.GetFrameTime() // Time in seconds since the last frame
 	for i := range particles {
-		particles[i].Pos.X += particles[i].Vel.X
+		particles[i].Pos.X += particles[i].Vel.X * deltaTime * 60 // Adjust for frame rate
-		particles[i].Pos.Y += particles[i].Vel.Y
+		particles[i].Pos.Y += particles[i].Vel.Y * deltaTime * 60
+
 		// Wrap around screen
 		if particles[i].Pos.X < 0 {
 			particles[i].Pos.X += float32(screenWidth)

main.go

@@ -24,7 +24,11 @@ func main() {
 	rl.SetWindowState(rl.FlagFullscreenMode)
 	defer rl.CloseWindow()
 
-	rl.SetTargetFPS(60)
+	refreshRate := rl.GetMonitorRefreshRate(monitor)
+	if refreshRate <= 0 {
+		refreshRate = 60 // Fallback to 60 if detection fails
+	}
+	rl.SetTargetFPS(int32(refreshRate))
 
 	InitBackground(rl.GetScreenWidth(), rl.GetScreenHeight())
 

transition.go

@@ -1,8 +1,6 @@
 package main
 
 import (
-	"time"
-
 	rl "github.com/gen2brain/raylib-go/raylib"
 )
 
@@ -24,36 +22,54 @@ const (
 
 type TransitionManager struct {
 	active    bool
-	startTime time.Time
-	phase     TransitionPhase
 	direction TransitionDirection
+
 	oldStep int
 	newStep int
 
-	outFadeScaleDuration time.Duration
+	// Single total transition duration (seconds)
-	outSlideDuration     time.Duration
+	totalSec float32
-	inFadeScaleDuration  time.Duration
+
+	// Sub-phase fractions (must sum to 1.0)
+	fadeFrac  float32
+	slideFrac float32
+	inFrac    float32
+
+	// Where we store the linear boundary of the sub-phase in [0..1]
+	fadeEnd  float32
+	slideEnd float32
+
+	// Accumulated time in seconds
+	accumSec float32
 }
 
+// NewTransitionManager with one total duration, e.g. 0.5 seconds total
+// Sub-phase fractions: fade=0.3, slide=0.4, fadeIn=0.3 (they sum to 1.0)
 func NewTransitionManager() *TransitionManager {
 	return &TransitionManager{
-		outFadeScaleDuration: 150 * time.Millisecond,
+		totalSec:  0.6, // e.g., entire transition 600ms
-		outSlideDuration:     200 * time.Millisecond,
+		fadeFrac:  0.3, // 30% of total time for fade out scale
-		inFadeScaleDuration:  150 * time.Millisecond,
+		slideFrac: 0.4, // 40% of total time for slide
+		inFrac:    0.3, // 30% of total time for fade in scale
 	}
 }
 
 func (t *TransitionManager) Start(oldStep, newStep int) {
 	t.active = true
-	t.startTime = time.Now()
+	t.accumSec = 0
-	t.phase = TransitionOutFadeScale
 	t.oldStep = oldStep
 	t.newStep = newStep
+
 	if newStep > oldStep {
 		t.direction = DirectionForward
 	} else {
 		t.direction = DirectionBackward
 	}
+
+	// Precompute sub-phase boundaries in [0..1]
+	t.fadeEnd = t.fadeFrac
+	t.slideEnd = t.fadeFrac + t.slideFrac
+	// Final inFrac ends at 1.0
 }
 
 func (t *TransitionManager) IsActive() bool {
@@ -65,80 +81,103 @@ func (t *TransitionManager) GetPhase() TransitionPhase {
 	if !t.active {
 		return TransitionNone
 	}
-	elapsed := time.Since(t.startTime)
-	total := t.outFadeScaleDuration + t.outSlideDuration + t.inFadeScaleDuration
 
-	if elapsed >= total {
+	// Determine the linear progress
-		return TransitionNone
+	p := t.accumSec / t.totalSec
-	} else if elapsed < t.outFadeScaleDuration {
+	if p < t.fadeEnd {
 		return TransitionOutFadeScale
-	} else if elapsed < t.outFadeScaleDuration+t.outSlideDuration {
+	} else if p < t.slideEnd {
 		return TransitionOutSlide
 	} else {
 		return TransitionInFadeScale
 	}
 }
 
-func (t *TransitionManager) Update() (oldAlpha float32, oldScale float32, oldOffsetX float32,
+// Easing function: "easeInOutCubic" => pronounced slow start, fast middle, slow end
-	newAlpha float32, newScale float32, newOffsetX float32) {
+func easeInOutCubic(p float32) float32 {
+	if p < 0.5 {
+		return 4 * p * p * p
+	}
+	f := (2 * p) - 2
+	return 0.5*f*f*f + 1
+}
+
+// Update returns alpha/scale/offset for old/new steps
+func (t *TransitionManager) Update() (
+	oldAlpha, oldScale, oldOffsetX float32,
+	newAlpha, newScale, newOffsetX float32,
+) {
 	if !t.active {
-		return 1.0, 1.0, 0.0, 1.0, 1.0, 0.0
+		return 1, 1, 0, 1, 1, 0
 	}
 
-	elapsed := time.Since(t.startTime)
+	// Accumulate variable time
-	totalDuration := t.outFadeScaleDuration + t.outSlideDuration + t.inFadeScaleDuration
+	dt := rl.GetFrameTime() // in seconds
-	if elapsed >= totalDuration {
+	t.accumSec += dt
-		// Transition done
+	if t.accumSec >= t.totalSec {
 		t.active = false
-		return 1.0, 1.0, 0.0, 1.0, 1.0, 0.0
+		return 1, 1, 0, 1, 1, 0
 	}
 
-	oldAlpha = 1.0
+	oldAlpha, oldScale, oldOffsetX = 1, 1, 0
-	oldScale = 1.0
+	newAlpha, newScale, newOffsetX = 1, 1, 0
-	oldOffsetX = 0.0
-	newAlpha = 1.0
-	newScale = 1.0
-	newOffsetX = 0.0
 
-	slideDirection := float32(-1)
+	slideDir := float32(-1)
 	if t.direction == DirectionBackward {
-		slideDirection = 1
+		slideDir = 1
 	}
 
-	if elapsed < t.outFadeScaleDuration {
+	p := t.accumSec / t.totalSec
-		// Phase 1: Out Fade/Scale
+	if p > 1 {
-		progress := float32(elapsed.Milliseconds()) / float32(t.outFadeScaleDuration.Milliseconds())
+		p = 1
-		oldAlpha = 1.0 - 0.2*progress
+	}
-		oldScale = 1.0 - 0.1*progress
 
-		// New tab not visible at all yet
+	globalP := easeInOutCubic(p)
-		newAlpha = 0.0
+
+	if p < t.fadeEnd {
+		gEnd := easeInOutCubic(t.fadeEnd)
+		subE := float32(0)
+		if gEnd > 0 {
+			subE = globalP / gEnd
+		}
+
+		oldAlpha = 1 - 0.2*subE
+		oldScale = 1 - 0.1*subE
+		newAlpha = 0
 		newScale = 0.9
-		newOffsetX = float32(rl.GetScreenWidth()) * slideDirection
+		newOffsetX = float32(rl.GetScreenWidth()) * slideDir
-	} else if elapsed < t.outFadeScaleDuration+t.outSlideDuration {
+
-		// Phase 2: Slide out old, slide in new
+	} else if p < t.slideEnd {
-		phaseElapsed := elapsed - t.outFadeScaleDuration
+		gStart := easeInOutCubic(t.fadeEnd)
-		progress := float32(phaseElapsed.Milliseconds()) / float32(t.outSlideDuration.Milliseconds())
+		gEnd := easeInOutCubic(t.slideEnd)
+		gRange := gEnd - gStart
+		subE := float32(0)
+		if gRange > 0 {
+			subE = (globalP - gStart) / gRange
+		}
 
 		oldAlpha = 0.8
 		oldScale = 0.9
-		oldOffsetX = -float32(rl.GetScreenWidth()) * progress * slideDirection
+		oldOffsetX = -float32(rl.GetScreenWidth()) * subE * slideDir
-
 		newAlpha = 0.8
 		newScale = 0.9
-		newOffsetX = float32(rl.GetScreenWidth()) * (1.0 - progress) * slideDirection
+		newOffsetX = float32(rl.GetScreenWidth()) * (1 - subE) * slideDir
+
 	} else {
-		// Phase 3: In Fade/Scale
+		gStart := easeInOutCubic(t.slideEnd)
-		phaseElapsed := elapsed - t.outFadeScaleDuration - t.outSlideDuration
+		gEnd := easeInOutCubic(1)
-		progress := float32(phaseElapsed.Milliseconds()) / float32(t.inFadeScaleDuration.Milliseconds())
+		gRange := gEnd - gStart
+		subE := float32(0)
+		if gRange > 0 {
+			subE = (globalP - gStart) / gRange
+		}
 
-		oldAlpha = 0.0
+		oldAlpha = 0
 		oldScale = 0.9
-		oldOffsetX = -float32(rl.GetScreenWidth()) * slideDirection
+		oldOffsetX = -float32(rl.GetScreenWidth()) * slideDir
-
+		newAlpha = 0.8 + 0.2*subE
-		newAlpha = 0.8 + 0.2*progress
+		newScale = 0.9 + 0.1*subE
-		newScale = 0.9 + 0.1*progress
+		newOffsetX = 0
-		newOffsetX = 0.0
 	}
 
 	return oldAlpha, oldScale, oldOffsetX, newAlpha, newScale, newOffsetX