ShaderBridge

Convert Unity ShaderLab/HLSL shaders to Godot 4.x GDShader — CLI, Python API, and Web UI.

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Features

• Full ShaderLab parser — Properties, SubShaders, Passes, CGPROGRAM/HLSLPROGRAM
• HLSL → GDShader translator — types, functions, matrices, time, lighting
• Surface shader support — surf() → fragment() with PBR output mapping
• Compatibility checker — scores shaders 0–100%, flags unsupported features
• Rich CLI — convert, batch, validate, info, watch, serve, pipe
• Python API — import and use in your own tools
• Web UI — browser-based editor with live validation and 3D preview
• AI conversion — optional Groq LLM fallback for complex shaders

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Install

# Core CLI only (no web server)
pip install shaderbridge

# With web UI server
pip install "shaderbridge[web]"

# With file-watch mode
pip install "shaderbridge[watch]"

# Everything
pip install "shaderbridge[all]"

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CLI Usage

Convert a single shader

shaderbridge convert MyShader.shader
shaderbridge convert MyShader.shader -o out/MyShader.gdshader
shaderbridge convert MyShader.shader --validate --verbose --show-output

Batch convert a directory

shaderbridge batch ./Assets/Shaders/ -o ./GodotProject/shaders/
shaderbridge batch ./Assets/ -o ./out/ --validate --fail-fast

Validate compatibility

shaderbridge validate MyShader.shader
shaderbridge validate MyShader.shader --json

Inspect shader metadata

shaderbridge info MyShader.shader

Watch mode (auto-convert on save)

pip install "shaderbridge[watch]"
shaderbridge watch ./Assets/Shaders/ -o ./GodotProject/shaders/

Launch web UI

pip install "shaderbridge[web]"
shaderbridge serve
shaderbridge serve --port 8080 --no-browser

Pipe / stdin mode (CI-friendly)

cat MyShader.shader | shaderbridge pipe > MyShader.gdshader
cat MyShader.shader | shaderbridge pipe --validate --json

JSON output for scripting

shaderbridge convert MyShader.shader --json
shaderbridge batch ./shaders/ --json | jq '.results[] | select(.success == false)'

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Python API

from shader_converter.parser.unity_shader_parser import UnityShaderParser
from shader_converter.generator.godot_shader_generator import AdvancedGodotShaderGenerator
from shader_converter.validator.compatibility_checker import DetailedCompatibilityChecker

unity_code = open("MyShader.shader").read()

# Parse
parser = UnityShaderParser()
ast = parser.parse(unity_code)

# Validate
checker = DetailedCompatibilityChecker()
report = checker.check_compatibility(ast)
print(f"Compatibility: {report['compatibility_score'] * 100:.0f}%")

# Generate
generator = AdvancedGodotShaderGenerator()
result = generator.generate(ast)

if result["success"]:
    open("MyShader.gdshader", "w").write(result["code"])
    print(result["code"])

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What Gets Converted

Unity / HLSL	Godot 4.x
float4, half4, fixed4	vec4
float3x3, float4x4	mat3, mat4
tex2D(tex, uv)	texture(tex, uv)
lerp(a, b, t)	mix(a, b, t)
saturate(x)	clamp(x, 0.0, 1.0)
frac(x)	fract(x)
ddx / ddy	dFdx / dFdy
clip(x)	if (x < 0.0) discard;
UNITY_MATRIX_MVP	MODELVIEWPROJECTION_MATRIX
unity_ObjectToWorld	MODEL_MATRIX
_Time.y	TIME
UnityObjectToClipPos(v)	MODELVIEWPROJECTION_MATRIX * vec4(v, 1.0)
TRANSFORM_TEX(uv, tex)	uv * tex_ST.xy + tex_ST.zw
o.Albedo =	ALBEDO =
o.Metallic =	METALLIC =
o.Smoothness =	ROUGHNESS = 1.0 -
o.Emission =	EMISSION =
o.Normal =	NORMAL_MAP =

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Unsupported Features

These Unity features have no direct Godot equivalent and will be flagged:

• Geometry shaders (#pragma geometry)
• Tessellation (#pragma hull / #pragma domain)
• Compute shaders (#pragma kernel)
• GrabPass (use Godot viewport textures instead)
• Ray tracing (RayQuery, RayDesc)
• UAV / RW resources

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Web UI

shaderbridge serve
# Opens http://localhost:5000

Features:

• Side-by-side Unity / Godot editor
• Live compatibility validation
• 3D WebGL preview (Three.js)
• AI-powered conversion (requires GROQ_API_KEY)
• Conversion history
• Download / copy output

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Environment Variables

Variable	Description
GROQ_API_KEY	Groq API key for AI-powered conversion (optional)

Create a .env file in the project root:

GROQ_API_KEY=your_key_here

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Development

git clone https://github.com/Sreejith-nair511/SWC-Redux-2033
pip install -e ".[all]"
pytest tests/ -v

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License

MIT — see LICENSE