7edf5bc4d0
Major updates: - Added 35+ new skills from awesome-opencode-skills and antigravity repos - Merged SEO skills into seo-master - Merged architecture skills into architecture - Merged security skills into security-auditor and security-coder - Merged testing skills into testing-master and testing-patterns - Merged pentesting skills into pentesting - Renamed website-creator to thai-frontend-dev - Replaced skill-creator with github version - Removed Chutes references (use MiniMax API instead) - Added install-openclaw-skills.sh for cross-platform installation - Updated .env.example with MiniMax API credentials
42 lines
1.9 KiB
Markdown
42 lines
1.9 KiB
Markdown
# WebGL2 Pitfalls Reference
|
|
|
|
This is a reference document for the [webgl-pitfalls](../techniques/webgl-pitfalls.md) technique.
|
|
|
|
## Complete Error Message Reference
|
|
|
|
| Error Message | Likely Cause | Solution |
|
|
|---|---|---|
|
|
| `'fragCoord' : undeclared identifier` | Using `fragCoord` instead of `gl_FragCoord.xy` in WebGL2 | Replace with `gl_FragCoord.xy` |
|
|
| `'' : Missing main()` | Fragment shader has no `main()` function | Add `void main() { mainImage(fragColor, gl_FragCoord.xy); }` wrapper |
|
|
| `'functionName' : no matching overloaded function found` | Wrong argument types OR function declared after use | Check types; reorder or forward-declare functions |
|
|
| `'return' : function return is not matching type:` | Return expression type doesn't match declared return type | Verify `vec3 foo()` returns `vec3`, not `float` |
|
|
| `#version` must be first | Leading whitespace when extracting from script tag | Use `.trim()` on shader source string |
|
|
| Uniform returns `null` from `getUniformLocation` | Uniform optimized away for being unused | Ensure uniform is actually referenced in shader code |
|
|
|
|
## Type Mismatch Examples
|
|
|
|
```glsl
|
|
// ERROR: terrainM expects vec2, passing vec3
|
|
float calcAO(vec3 pos, vec3 nor) {
|
|
float d = terrainM(pos + h * nor); // Wrong: pos + h*nor is vec3
|
|
}
|
|
// FIX: Extract xz components
|
|
float calcAO(vec3 pos, vec3 nor) {
|
|
float d = terrainM(pos.xz + h * nor.xz); // Correct: vec2
|
|
}
|
|
```
|
|
|
|
```glsl
|
|
// ERROR: can't access .z on vec2
|
|
vec2 uv = vec2(1.0, 2.0);
|
|
float z = uv.z; // Wrong: vec2 has no .z
|
|
// FIX: use proper swizzle or conversion
|
|
float z = uv.y; // Or if you need third component, use vec3
|
|
```
|
|
|
|
## GLSL ES 3.0 Specific Notes
|
|
|
|
- All declared `uniform` variables must be used in shader code, otherwise compiler may optimize them away
|
|
- When `gl.getUniformLocation()` returns `null`, setting that uniform triggers `INVALID_OPERATION`
|
|
- Loop counters must be deterministic at runtime — avoid compile-time constant folding issues
|