alice-sdf 3.1.0

ALICE-SDF: 3D/Spatial Data Specialist — Store laws, not polygons. GLSL/WGSL/HLSL transpile, SVO, GPU marching cubes, texture-fit, procedural CSG. Optional bridges to alice-physics / alice-codec / libasp / alice-cache behind features.
Documentation 
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//! FFI functions for GPU shader code generation (WGSL, HLSL, GLSL).
//!
//! Author: Moroya Sakamoto

#[cfg(any(feature = "gpu", feature = "hlsl", feature = "glsl"))]
use super::guard::ffi_guard;
#[cfg(any(feature = "gpu", feature = "hlsl", feature = "glsl"))]
use super::registry::get_node;
#[cfg(any(feature = "gpu", feature = "hlsl", feature = "glsl"))]
use super::types::*;
#[cfg(any(feature = "gpu", feature = "hlsl", feature = "glsl"))]
use std::ffi::CString;
#[cfg(any(feature = "gpu", feature = "hlsl", feature = "glsl"))]
use std::ptr;

// ============================================================================
// Shader Generation
// ============================================================================

/// Generate WGSL shader code
#[no_mangle]
#[cfg(feature = "gpu")]
pub extern "C" fn alice_sdf_to_wgsl(node: SdfHandle) -> StringResult {
    ffi_guard(
        StringResult {
            data: std::ptr::null_mut(),
            len: 0,
            result: SdfResult::Unknown,
        },
        || {
            let sdf_node = match get_node(node) {
                Some(n) => n,
                None => {
                    return StringResult {
                        data: ptr::null_mut(),
                        len: 0,
                        result: SdfResult::InvalidHandle,
                    }
                }
            };

            let shader = crate::compiled::WgslShader::transpile(
                &sdf_node,
                crate::compiled::TranspileMode::Hardcoded,
            );
            match CString::new(shader.source.clone()) {
                Ok(s) => {
                    let len = shader.source.len() as u32;
                    StringResult {
                        data: s.into_raw(),
                        len,
                        result: SdfResult::Ok,
                    }
                }
                Err(_) => StringResult {
                    data: ptr::null_mut(),
                    len: 0,
                    result: SdfResult::Unknown,
                },
            }
        },
    )
}

/// Generate HLSL shader code
#[no_mangle]
#[cfg(feature = "hlsl")]
pub extern "C" fn alice_sdf_to_hlsl(node: SdfHandle) -> StringResult {
    ffi_guard(
        StringResult {
            data: std::ptr::null_mut(),
            len: 0,
            result: SdfResult::Unknown,
        },
        || {
            let sdf_node = match get_node(node) {
                Some(n) => n,
                None => {
                    return StringResult {
                        data: ptr::null_mut(),
                        len: 0,
                        result: SdfResult::InvalidHandle,
                    }
                }
            };

            let shader = crate::compiled::HlslShader::transpile(
                &sdf_node,
                crate::compiled::HlslTranspileMode::Hardcoded,
            );
            match CString::new(shader.source.clone()) {
                Ok(s) => {
                    let len = shader.source.len() as u32;
                    StringResult {
                        data: s.into_raw(),
                        len,
                        result: SdfResult::Ok,
                    }
                }
                Err(_) => StringResult {
                    data: ptr::null_mut(),
                    len: 0,
                    result: SdfResult::Unknown,
                },
            }
        },
    )
}

/// Generate GLSL shader code
#[no_mangle]
#[cfg(feature = "glsl")]
pub extern "C" fn alice_sdf_to_glsl(node: SdfHandle) -> StringResult {
    ffi_guard(
        StringResult {
            data: std::ptr::null_mut(),
            len: 0,
            result: SdfResult::Unknown,
        },
        || {
            let sdf_node = match get_node(node) {
                Some(n) => n,
                None => {
                    return StringResult {
                        data: ptr::null_mut(),
                        len: 0,
                        result: SdfResult::InvalidHandle,
                    }
                }
            };

            let shader = crate::compiled::GlslShader::transpile(
                &sdf_node,
                crate::compiled::GlslTranspileMode::Hardcoded,
            );
            match CString::new(shader.source.clone()) {
                Ok(s) => {
                    let len = shader.source.len() as u32;
                    StringResult {
                        data: s.into_raw(),
                        len,
                        result: SdfResult::Ok,
                    }
                }
                Err(_) => StringResult {
                    data: ptr::null_mut(),
                    len: 0,
                    result: SdfResult::Unknown,
                },
            }
        },
    )
}