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+# GLSL Built-in Functions Reference
+
+Complete reference for GLSL ES 1.0 / WebGL functions.
+
+## Trigonometric Functions
+
+| Function | Description | Range |
+|----------|-------------|-------|
+| `sin(x)` | Sine | [-1, 1] |
+| `cos(x)` | Cosine | [-1, 1] |
+| `tan(x)` | Tangent | unbounded |
+| `asin(x)` | Arc sine | [-PI/2, PI/2] |
+| `acos(x)` | Arc cosine | [0, PI] |
+| `atan(y, x)` | Arc tangent (quadrant-aware) | [-PI, PI] |
+| `atan(y_over_x)` | Arc tangent | [-PI/2, PI/2] |
+
+All accept float, vec2, vec3, vec4. Input in radians.
+
+## Exponential Functions
+
+| Function | Description |
+|----------|-------------|
+| `pow(x, y)` | x raised to power y |
+| `exp(x)` / `exp2(x)` | e^x / 2^x |
+| `log(x)` / `log2(x)` | Natural / Base-2 logarithm |
+| `sqrt(x)` / `inversesqrt(x)` | Square root / 1/sqrt(x) |
+
+## Common Functions
+
+| Function | Description |
+|----------|-------------|
+| `abs(x)` / `sign(x)` | Absolute value / -1, 0, or 1 |
+| `floor(x)` / `ceil(x)` | Round down / up |
+| `fract(x)` | x - floor(x) |
+| `mod(x, y)` | x - y * floor(x/y) |
+| `min(x, y)` / `max(x, y)` | Minimum / Maximum |
+| `clamp(x, min, max)` | Constrain to range |
+| `mix(a, b, t)` | Linear interpolation: a*(1-t) + b*t |
+| `step(edge, x)` | 0.0 if x < edge, else 1.0 |
+| `smoothstep(e0, e1, x)` | Hermite interpolation |
+
+## Geometric Functions
+
+| Function | Description |
+|----------|-------------|
+| `length(v)` / `distance(a, b)` | Magnitude / Distance |
+| `dot(a, b)` / `cross(a, b)` | Dot / Cross product |
+| `normalize(v)` | Unit vector |
+| `reflect(i, n)` / `refract(i, n, eta)` | Reflection / Refraction |
+
+## Vector Relational Functions
+
+`lessThan`, `lessThanEqual`, `greaterThan`, `greaterThanEqual`, `equal`, `notEqual` - Return bvec.
+`any(bvec)`, `all(bvec)`, `not(bvec)` - Boolean operations.
+
+## Texture Functions
+
+| Function | Description |
+|----------|-------------|
+| `texture2D(sampler, coord)` | Sample 2D texture |
+| `textureCube(sampler, coord)` | Sample cube map |
+
+## Constants
+
+```glsl
+#define PI 3.14159265359
+#define TWO_PI 6.28318530718
+#define HALF_PI 1.57079632679
+```
+
+## Type Constructors
+
+```glsl
+vec2(x), vec2(x, y)
+vec3(x), vec3(xy, z), vec3(x, y, z)
+vec4(x), vec4(xyz, w), vec4(xy, zw)
+mat2(a, b, c, d), mat3(...), mat4(...)
+```
+
+## Operators
+
+```glsl
+  -  *  /           // Arithmetic (component-wise)
+<  >  <=  >=  ==  != // Comparison
+&&  ||  !            // Logical
+mat * mat            // Matrix multiply
+mat * vec            // Transform vector
+```
+
+## Qualifiers
+
+```glsl
+attribute  // Vertex input
+uniform    // Constant across draw
+varying    // Interpolated vertex->fragment
+lowp / mediump / highp  // Precision
+in / out / inout / const // Parameters
+```
+
+## Built-in Variables
+
+```glsl
+// Fragment Shader
+vec4 gl_FragCoord;   // Window coordinates
+vec4 gl_FragColor;   // Output color (write only)
+bool gl_FrontFacing; // Front face?
+vec2 gl_PointCoord;  // Point sprite [0,1]
+
+// Vertex Shader
+vec4 gl_Position;    // Clip-space position
+float gl_PointSize;  // Point size
+```