---

CrossTL - Universal Programming Language & Translator

CrossTL is a revolutionary universal programming language translator built around CrossGL - a powerful intermediate representation (IR) language that serves as the bridge between diverse programming languages, platforms, and computing paradigms. More than just a translation tool, CrossGL represents a complete programming language designed for universal code portability and cross-platform development.

🌍 CrossGL: The Universal Programming Language

Beyond Shader Translation - A Complete Programming Ecosystem

CrossGL has evolved far beyond its origins as a shader language into a comprehensive programming language with full support for:

• Advanced Control Flow: Complex conditionals, loops, switch statements, and pattern matching
• Rich Data Structures: Arrays, structs, enums, and custom types
• Memory Management: Buffer handling, pointer operations, and memory layout control
• Function Systems: First-class functions, generics, and polymorphism
• Compute Paradigms: Parallel processing, GPU computing, and heterogeneous execution
• Modern Language Features: Type inference, pattern matching, and algebraic data types

🚀 Write Once, Deploy Everywhere

CrossGL enables you to write sophisticated programs once and deploy across:

• Graphics APIs: Metal, DirectX (HLSL), OpenGL (GLSL), Vulkan (SPIRV)
• Systems Languages: Rust, Mojo
• GPU Computing: CUDA, HIP
• Specialized Domains: Slang (real-time graphics), compute shaders

🎯 Supported Translation Targets

CrossTL provides comprehensive bidirectional translation between CrossGL and major programming ecosystems:

Graphics & Compute APIs

• Metal - Apple's unified graphics and compute API
• DirectX (HLSL) - Microsoft's graphics framework
• OpenGL (GLSL) - Cross-platform graphics standard
• Vulkan (SPIRV) - High-performance graphics and compute

Systems Programming Languages

• Rust - Memory-safe systems programming with GPU support
• Mojo - AI-first systems language with Python compatibility

Parallel Computing Platforms

• CUDA - NVIDIA's parallel computing platform
• HIP - AMD's GPU computing interface

Specialized Languages

• Slang - Real-time shading and compute language

Universal Intermediate Representation

• CrossGL (.cgl) - Our universal programming language and IR

💡 Revolutionary Advantages

1. 🔄 Universal Portability: Write complex algorithms once, run on any platform
2. ⚡ Performance Preservation: Maintain optimization opportunities across translations
3. 🧠 Simplified Development: Master one language instead of platform-specific variants
4. 🔍 Advanced Debugging: Universal tooling for analysis and optimization
5. 🔮 Future-Proof Architecture: Easily adapt to emerging programming paradigms
6. 🌐 Bidirectional Translation: Migrate existing codebases to CrossGL or translate to any target
7. 📈 Scalable Complexity: From simple shaders to complex distributed algorithms
8. 🎯 Domain Flexibility: Graphics, AI, HPC, systems programming, and beyond

⚙️ Translation Architecture

CrossTL employs a sophisticated multi-stage translation pipeline:

1. Lexical Analysis: Advanced tokenization with context-aware parsing
2. Syntax Analysis: Robust AST generation with error recovery
3. Semantic Analysis: Type checking, scope resolution, and semantic validation
4. IR Generation: Conversion to CrossGL intermediate representation
5. Optimization Passes: Platform-agnostic code optimization and analysis
6. Target Generation: Backend-specific code generation with optimization
7. Post-Processing: Platform-specific optimizations and formatting

🔄 Bidirectional Translation Capabilities

CrossGL supports seamless translation in both directions - import existing code from any supported language or export CrossGL to any target platform.

🌈 CrossGL Programming Language Examples

Complex Algorithm Implementation

```cpp // Advanced pattern matching and algebraic data types enum Result { Ok(T), Error(E) }

struct Matrix { data: T[], rows: u32, cols: u32 }

function matrixMultiply(a: Matrix, b: Matrix) -> Result, String> { if (a.cols != b.rows) { return Result::Error("Matrix dimensions incompatible"); }

let result = Matrix<T> {
    data: new T[a.rows * b.cols],
    rows: a.rows,
    cols: b.cols
};

parallel for i in 0..a.rows {
    for j in 0..b.cols {
        let mut sum = T::default();
        for k in 0..a.cols {
            sum += a.data[i * a.cols + k] * b.data[k * b.cols + j];
        }
        result.data[i * result.cols + j] = sum;
    }
}

return Result::Ok(result);

}

// GPU compute shader with advanced memory management compute spawn matrixCompute { buffer float* matrixA; buffer float* matrixB; buffer float* result;

local float shared_memory[256];

void main() {
    let idx = workgroup_id() * workgroup_size() + local_id();

    // Complex parallel reduction with shared memory
    shared_memory[local_id()] = matrix_A[idx] * matrix_B[idx];
    workgroup_barrier();

    // Tree reduction
    for stride in [128, 64, 32, 16, 8, 4, 2, 1] {
        if (local_id() < stride) {
            shared_memory[local_id()] += shared_memory[local_id() + stride];
        }
        workgroup_barrier();
    }

    if (local_id() == 0) {
        result[workgroup_id()] = shared_memory[0];
    }
}

} ```

Advanced Graphics Pipeline

```cpp // Physically-based rendering with advanced material system struct Material { albedo: vec3, metallic: float, roughness: float, normal_map: texture2d, displacement: texture2d }

struct Lighting { position: vec3, color: vec3, intensity: float, attenuation: vec3 }

shader PBRShader { vertex { input vec3 position; input vec3 normal; input vec2 texCoord; input vec4 tangent;

    uniform mat4 modelMatrix;
    uniform mat4 viewMatrix;
    uniform mat4 projectionMatrix;

    output vec3 worldPos;
    output vec3 worldNormal;
    output vec2 uv;
    output mat3 TBN;

    void main() {
        vec4 worldPosition = modelMatrix * vec4(position, 1.0);
        worldPos = worldPosition.xyz;

        vec3 T = normalize(vec3(modelMatrix * vec4(tangent.xyz, 0.0)));
        vec3 N = normalize(vec3(modelMatrix * vec4(normal, 0.0)));
        vec3 B = cross(N, T) * tangent.w;
        TBN = mat3(T, B, N);

        worldNormal = N;
        uv = texCoord;

        gl_Position = projectionMatrix * viewMatrix * worldPosition;
    }
}

// Advanced fragment shader with PBR lighting
fragment {
    input vec3 worldPos;
    input vec3 worldNormal;
    input vec2 uv;
    input mat3 TBN;

    uniform Material material;
    uniform Lighting lights[8];
    uniform int lightCount;
    uniform vec3 cameraPos;

    output vec4 fragColor;

    vec3 calculatePBR(vec3 albedo, float metallic, float roughness,
                     vec3 normal, vec3 viewDir, vec3 lightDir, vec3 lightColor) {
        // Advanced PBR calculation with microfacet model
        vec3 halfVector = normalize(viewDir + lightDir);
        float NdotV = max(dot(normal, viewDir), 0.0);
        float NdotL = max(dot(normal, lightDir), 0.0);
        float NdotH = max(dot(normal, halfVector), 0.0);
        float VdotH = max(dot(viewDir, halfVector), 0.0);

        // Fresnel term
        vec3 F0 = mix(vec3(0.04), albedo, metallic);
        vec3 F = F0 + (1.0 - F0) * pow(1.0 - VdotH, 5.0);

        // Distribution term (GGX)
        float alpha = roughness * roughness;
        float alpha2 = alpha * alpha;
        float denom = NdotH * NdotH * (alpha2 - 1.0) + 1.0;
        float D = alpha2 / (3.14159 * denom * denom);

        // Geometry term
        float G = geometrySmith(NdotV, NdotL, roughness);

        vec3 numerator = D * G * F;
        float denominator = 4.0 * NdotV * NdotL + 0.001;
        vec3 specular = numerator / denominator;

        vec3 kS = F;
        vec3 kD = vec3(1.0) - kS;
        kD *= 1.0 - metallic;

        return (kD * albedo / 3.14159 + specular) * lightColor * NdotL;
    }

    void main() {
        vec3 normal = normalize(TBN * (texture(material.normal_map, uv).rgb * 2.0 - 1.0));
        vec3 viewDir = normalize(cameraPos - worldPos);

        vec3 color = vec3(0.0);

        for (int i = 0; i < lightCount; ++i) {
            vec3 lightDir = normalize(lights[i].position - worldPos);
            float distance = length(lights[i].position - worldPos);
            float attenuation = 1.0 / (lights[i].attenuation.x +
                                      lights[i].attenuation.y * distance +
                                      lights[i].attenuation.z * distance * distance);

            vec3 lightColor = lights[i].color * lights[i].intensity * attenuation;
            color += calculatePBR(material.albedo, material.metallic,
                                 material.roughness, normal, viewDir, lightDir, lightColor);
        }

        // Add ambient lighting
        color += material.albedo * 0.03;

        // Tone mapping and gamma correction
        color = color / (color + vec3(1.0));
        color = pow(color, vec3(1.0/2.2));

        fragColor = vec4(color, 1.0);
    }
}

} ```

Getting Started

Install CrossTL's universal translator:

bash pip install crosstl

Basic Usage

1. Create CrossGL Program

```cpp // algorithm.cgl - Universal algorithm implementation function quicksort(arr: T[], low: i32, high: i32) -> void { if (low < high) { let pivot = partition(arr, low, high); quicksort(arr, low, pivot - 1); quicksort(arr, pivot + 1, high); } }

function partition(arr: T[], low: i32, high: i32) -> i32 { let pivot = arr[high]; let i = low - 1;

for j in low..high {
    if (arr[j] <= pivot) {
        i++;
        swap(arr[i], arr[j]);
    }
}

swap(arr[i + 1], arr[high]);
return i + 1;

}

compute parallel_sort { buffer float* data; uniform int size;

void main() {
    let idx = global_id();
    if (idx < size) {
        // Parallel bitonic sort implementation
        bitonicSort(data, size, idx);
    }
}

} ```

2. Universal Translation

```python import crosstl

Translate to any target language/platform

rustcode = crosstl.translate('algorithm.cgl', backend='rust', saveshader='algorithm.rs') cudacode = crosstl.translate('algorithm.cgl', backend='cuda', saveshader='algorithm.cu') metalcode = crosstl.translate('algorithm.cgl', backend='metal', saveshader='algorithm.metal') mojocode = crosstl.translate('algorithm.cgl', backend='mojo', saveshader='algorithm.mojo') ```

Advanced Translation Examples

Cross-Platform AI Kernels

```python import crosstl

Translate neural network kernels across AI platforms

ai_kernel = """ compute neuralNetwork { buffer float* weights; buffer float* inputs; buffer float* outputs; buffer float* biases;

uniform int input_size;
uniform int output_size;

void main() {
    let neuron_id = global_id();
    if (neuron_id >= output_size) return;

    float sum = 0.0;
    for i in 0..input_size {
        sum += weights[neuron_id * input_size + i] * inputs[i];
    }

    outputs[neuron_id] = relu(sum + biases[neuron_id]);
}

} """

Deploy across AI hardware platforms

cudaai = crosstl.translate(aikernel, backend='cuda') # NVIDIA GPUs hipai = crosstl.translate(aikernel, backend='hip') # AMD GPUs metalai = crosstl.translate(aikernel, backend='metal') # Apple Silicon mojoai = crosstl.translate(aikernel, backend='mojo') # Mojo AI runtime ```

Systems Programming Translation

```python

Translate systems-level code across platforms

systemscode = """ struct MemoryPool { buffer u8* memory; sizet capacity; size_t used; mutex lock; }

function allocate(pool: MemoryPool, size: size_t) -> void { lock_guard guard(pool.lock);

if (pool.used + size > pool.capacity) {
    return null;
}

void* ptr = pool.memory + pool.used;
pool.used += size;
return ptr;

} """

rustsystems = crosstl.translate(systemscode, backend='rust') # Memory-safe systems code cppsystems = crosstl.translate(systemscode, backend='cpp') # High-performance C++ csystems = crosstl.translate(systemscode, backend='c') # Portable C code ```

Reverse Translation - Import Existing Code

```python

Import and unify existing codebases

conversions = [ ('existingshader.hlsl', 'unified.cgl'), # DirectX to CrossGL ('gpukernel.cu', 'unified.cgl'), # CUDA to CrossGL ('graphics.metal', 'unified.cgl'), # Metal to CrossGL ('algorithm.rs', 'unified.cgl'), # Rust to CrossGL ('compute.mojo', 'unified.cgl'), # Mojo to CrossGL ]

for source, target in conversions: unifiedcode = crosstl.translate(source, backend='cgl', saveshader=target) print(f"✅ Unified {source} into CrossGL: {target}") ```

Comprehensive Platform Deployment

```python import crosstl

One CrossGL program, unlimited platforms

program = 'universal_algorithm.cgl'

Deploy across all supported platforms

deployment_targets = { # Graphics APIs 'metal': '.metal', # Apple ecosystems 'directx': '.hlsl', # Windows/Xbox 'opengl': '.glsl', # Cross-platform 'vulkan': '.spirv', # High-performance

# Systems languages
'rust': '.rs',          # Memory safety
'mojo': '.mojo',        # AI-optimized
'cpp': '.cpp',          # Performance
'c': '.c',              # Portability

# Parallel computing
'cuda': '.cu',          # NVIDIA
'hip': '.hip',          # AMD
'opencl': '.cl',        # Cross-vendor

# Specialized
'slang': '.slang',      # Real-time graphics
'wgsl': '.wgsl',        # Web platforms

}

for backend, extension in deploymenttargets.items(): outputfile = f'deployments/{program.stem}{backend}{extension}' try: code = crosstl.translate(program, backend=backend, saveshader=outputfile) print(f"✅ {backend.upper()}: {outputfile}") except Exception as e: print(f"⚠️ {backend.upper()}: {str(e)}")

print(f"\n🚀 Universal deployment complete!") print(f"📁 Check deployments/ directory for platform-specific implementations") ```

Language Features Deep Dive

CrossGL provides comprehensive programming language features:

Type System

• Strong static typing with type inference
• Generic programming with type parameters
• Algebraic data types (enums with associated data)
• Trait/interface system for polymorphism
• Memory layout control for performance

Control Flow

• Pattern matching for complex conditional logic
• Advanced loops (for, while, loop with break/continue)
• Exception handling with Result types
• Async/await for concurrent programming

Memory Management

• Explicit lifetime management when needed
• Buffer abstractions for GPU programming
• Pointer safety with compile-time checks
• Reference semantics for efficient data sharing

Parallelism

• Compute shaders for GPU programming
• Parallel loops for CPU vectorization
• Workgroup operations for GPU synchronization
• Memory barriers for consistency

For comprehensive language documentation, visit our Language Reference.

Contributing

CrossGL is a community-driven project. Whether you're contributing language features, backend implementations, optimizations, or documentation, your contributions shape the future of universal programming! 🌟

Find out more in our Contributing Guide

Community

Join the universal programming revolution

• Twitter - Latest updates and announcements
• LinkedIn - Professional community
• Discord - Real-time discussions and support
• YouTube - Tutorials and deep dives

Shape the future of programming languages!

License

CrossTL is open-source and licensed under the Apache License 2.0.

---

CrossGL: One Language, Infinite Possibilities 🌍

Building the universal foundation for the next generation of programming

The CrossGL Team