This project is an ambitious Proof of Concept (PoC) aiming to explore and master the advanced capabilities of AGSL (Android Graphics Shader Language) to create a suite of dynamic and highly interactive visual effects on bitmaps.

The goal is to demonstrate the power of shaders combined with touch input and device motion sensors to transform a simple bitmap into an immersive and reactive visual experience.

• 🧠 AGSL Mastery: Master complex fragment shaders and animation logic.
• 🖼️ Visual Quality: Aim for realism or high stylization per effect.
• 🧩 Interactivity: Link shaders to touch + motion sensors.
• ⚙️ Performance: Keep smooth framerate, minimize costly ops.
• 🔧 Modularity: Easily combine or add new shader effects.

• Kotlin + Jetpack Compose
• AGSL shader (android 13+ only)
• RuntimeShader / ShaderBrush
• Coroutines and State management for animation and interaction
• Math & trigonometry for wave modeling

• Sensor Access:
  • Use Android SensorManager to get accel/gyro data.
• Preprocessing:
  • Normalize, smooth, and convert to usable vectors.
• Shader Inputs:
  • Pass vectors to shaders as u_acceleration, u_orientation.

(not available on all shaders)

• Gesture Detection:
  • Map tap, long-press, swipe, pinch → shader triggers.
• Param Mapping:
  • Gesture data (position, pressure, velocity) → uniforms.

This PoC is structured around major graphic effects, each designed to be manipulated by specific interactions.

Simulates realistic ripples and refractions on a bitmap using a dynamic AGSL shader.

• Shader logic: Custom fragment shader deforms UVs based on a blend of up to 16 circular waves. Each wave is defined by center, amplitude, frequency, damping, and age.

• Visual result: The bitmap appears as a fluid surface, with natural-looking water ripples radiating from touch points. Deformations decay over time for smooth fading.

• User interaction: Touch or drag to spawn ripples. Multi-touch is fully supported — each gesture creates a separate wave. Wave parameters (amplitude, radius, decay) can be tuned.

• Animation model: Wave state is tracked in Compose and updated via withFrameNanos. Old waves are purged when their lifespan ends. The shader reacts in real-time.

• Component design: WaterEffectComposable wraps the canvas, touch handler, and shader logic cleanly. The system is modular, reactive, and ready for reuse or combination with other effects.

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Water Effect Shader 1	Water Effect Shader 2	Water Effect Shader 3

Simulates a dynamic holographic foil effect, with angle-sensitive iridescence, rainbow interference patterns, and chromatic distortion — all modulated in real time by the device’s physical orientation.

• Procedural iridescence using multi-layered FBM noise and enhanced HSV rainbow mapping.

• Surface normals are perturbed with fine micro-details to create realistic light interference zones.

• Fresnel modulation enhances realism by increasing brightness at glancing angles.

• Dynamic chromatic aberration adds subtle color shift based on device tilt roll.

• Realtime device tilt input (pitch/roll) drives view-dependent shimmer and distortion.

• Darkness-based masking ensures the effect appears only in low-luminance areas (e.g., shadowed or black ink zones).

• Reacts to device orientation (pitch & roll) via TYPE_ROTATION_VECTOR sensor.

• Fully GPU-based with no bitmap mutation — can be applied live on images, cards or backgrounds.

• All parameters (intensity, relief, color scale…) are externally controllable via Composables.

Ideal for mimicking collectible card effects, stickers, security patterns, or oil-slick-like visuals

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Holographic Effect	Rainbows Effect	Rainbows Effect alt	Iridescent Effect

Creates animated contour lines that behave like a flowing liquid surface. The effect blends smooth sinusoidal warping with multi-octave FBM noise to produce organic, fluid-like motions across a virtual topographic map.

• Technical:

  • UV warping driven by time-based sinusoidal fields.
  • FBM noise adds micro-variations and undulation to contour spacing.
  • Procedural topographic lines generated via fract() distance mapping.
  • Dual-pass rendering for crisp lines and soft glow halos.
  • Highly tunable shader parameters: density, thickness, noise scale, glow width, contrast, flow speed.

• Visual Result:
  Smooth, flowing iso-lines that evoke molten terrain, liquid cartography, or wave-driven elevation maps.

• Interaction:
  Fully animatable through uniforms (speed, intensity, density) and compatible with touch or sensor input to influence distortion fields or flow direction.

Standalone Repository: FlowRibbon: Hypnotic AGSL Shader

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Topographic Effect 1	Topographic Effect 2	Topographic Effect 3	Topographic Effect 4

High-fidelity post-processing engine for Android Jetpack Compose that emulates the physical behavior of CRT monitors and the thermal reaction of phosphor.

Unlike simple overlay filters, this shader pipeline transforms flat UI elements into an immersive analog medium with:

• Signal Jitter & H-Sync Instability: stochastic pixel shifts for realistic analog “snaps”
• Spherical Lens Distortion: curved screen effect for vintage CRT feel
• Shadow Mask & RGB Aberration: sub-pixel precision for authentic phosphor separation
• Thermal Reveal / Incandescence: dynamic glow and heat trails following UI elements

The engine is fully GPU-accelerated, frame-accurate, and tunable via uniforms, allowing developers to inject dynamic heat, glitch bursts, or lens curvature in real time.

Standalone Repository: Cathode-AGSL Shader Engine

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CRT + text Laser displayer shaders	CRT shader over pictures gallery	Signal Jitter & H-Sync Instability	CRT shader over text (scroll demo)

High-performance interactive background engine for Jetpack Compose that brings living, breathing organic patterns to your UI. Based on Dynamic Voronoi Tessellation, it simulates cell membranes that merge, split, and react to touch in real-time, giving the impression of a physical, fluid surface rather than a flat shader.

Key Features:

• Reactive Touch Fields: Finger input creates repulsion/attraction forces on cell nuclei for realistic viscosity effects
• Dual-Layer Voronoi: Macro and Detail layers provide smooth motion plus intricate parallax depth
• Emotion-Driven Color Palettes: Smooth transitions between Calm (Idle), Active, and Alert states
• Glitch-Free Fluidity: Extended neighborhood search (5x5 grid) ensures topology integrity even under extreme distortion
• GPU Optimized: Per-pixel AGSL calculations with minimal CPU overhead for high frame-rate performance

Standalone Repository: AGSL Organic Cell Engine

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Alt Organic Cell Shader	Advanced Organic Cell layers Shader	Interactive Organic Cell Shader	Alt Interactive Organic Cell Shader

More coming soon ... 😉❤️

“Pushing pixels, bending light, and making Android screens behave like magic.”