Shaders 🎨⚡

1. What is a Shader?

A shader is a small program that runs on the GPU and decides how pixels, lighting, and surfaces appear on screen.

2. Why Shaders Matter

Without shaders ❌ → flat graphics
With shaders ✅ → realistic visuals

Used for:
- Water 🌊
- Fire 🔥
- Glass 🪟
- Shadows 🌑

3. Types of Shaders

Vertex Shader 📍 → positions objects
Fragment Shader 🎨 → colors pixels
Pixel Shader 🧱 → final pixel output
Compute Shader ⚡ → advanced GPU calculations

4. Lighting Shaders

Diffuse Lighting ☀️ → basic light
Specular Lighting ✨ → shiny reflections
Ambient Light 🌫️ → soft global light

5. Visual Effects

Water ripple 🌊
Fire glow 🔥
Glow effects ✨
Motion blur 🌀
Holograms 🧿

6. Shaders in Game Engines

Unity 🎮 → Shader Graph / HLSL
Unreal 🎮🔥 → Material Editor
Blender 🧊 → Material Nodes

7. Real Game Examples

Minecraft ⛏️ → block shaders + lighting mods
Cyberpunk 🌆 → neon + reflection shaders
GTA V 🚗 → realistic lighting shaders

8. Shader Workflow

Model 🧊 → Material 🎨 → Shader ⚡ → GPU Rendering 🖥️