steamaudio_geometry.cpp

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#include "steamaudio_geometry.h"

SteamAudioGeometry::SteamAudioGeometry() {
    global_state = SteamAudioServer::get_singleton()->clone_global_state();
}

SteamAudioGeometry::~SteamAudioGeometry() {
    deregister_geometry();
    destroy_geometry();
}

int SteamAudioGeometry::create_geometry(const Ref<Mesh> mesh, Transform3D mesh_global_transform) {
    int n_surfaces = mesh->get_surface_count();
    IPLMaterial default_replace_me;
    default_replace_me.absorption[0] = 0.10f;
    default_replace_me.absorption[1] = 0.20f;
    default_replace_me.absorption[2] = 0.30f;
    default_replace_me.scattering = 0.05f;
    default_replace_me.transmission[0] = 0.100f;
    default_replace_me.transmission[1] = 0.050f;
    default_replace_me.transmission[2] = 0.030f;
     
    for (int sidx = 0; sidx < n_surfaces; sidx++) {
        Array surface_data = mesh->surface_get_arrays(sidx);
        Array verts_gd = surface_data[Mesh::ARRAY_VERTEX];
        Array triangles_gd = surface_data[Mesh::ARRAY_INDEX];
        Vector<IPLVector3> verts;
        Vector<IPLTriangle> triangles;
        Vector<IPLint32> material_indices;
        verts.resize(verts_gd.size());
        for (int vidx = 0; vidx < verts_gd.size(); vidx++) {
            IPLVector3 vert;
            Vector3 vert_gd = verts_gd[vidx];
            vert_gd = mesh_global_transform.basis.xform(vert_gd);
            vert_gd += mesh_global_transform.origin;
            vert.x = vert_gd.x;
            vert.y = vert_gd.y;
            vert.z = vert_gd.z;
            
            verts.set(vidx, vert);

        }
        for (int tidx = 0; tidx < triangles_gd.size(); tidx+=3) {
            IPLTriangle tri;
            //Convert Godot CW to SteamAudio CCW
            tri.indices[0] = triangles_gd[tidx];
            tri.indices[1] = triangles_gd[tidx+2];
            tri.indices[2] = triangles_gd[tidx+1];
            triangles.push_back(tri);
            material_indices.push_back(0);
        }

        IPLStaticMeshSettings static_mesh_settings{};
        static_mesh_settings.numVertices = verts.size();
        static_mesh_settings.numTriangles = triangles.size();
        static_mesh_settings.numMaterials = 1;
        static_mesh_settings.vertices = verts.ptrw();
        static_mesh_settings.triangles =  triangles.ptrw();
        static_mesh_settings.materialIndices = material_indices.ptrw();
        static_mesh_settings.materials = &default_replace_me;
        IPLStaticMesh static_mesh = nullptr;
        IPLerror errorCode = iplStaticMeshCreate(global_state->scene, &static_mesh_settings, &static_mesh);
        if (errorCode) {
            printf("Err code for iplStaticMeshCreate: %d\n", errorCode);
            return (int)errorCode;
        }

        static_meshes.push_back(iplStaticMeshRetain(static_mesh));
    }
    return 0;
    
}

int SteamAudioGeometry::destroy_geometry() {
    for (int midx = 0; midx < static_meshes.size(); midx++) {
        IPLStaticMesh mesh_ptr = static_meshes.get(midx);
        iplStaticMeshRelease(&mesh_ptr);
    }
    static_meshes.clear();
    return 0;
}

int SteamAudioGeometry::register_geometry() {
    for (int midx = 0; midx < static_meshes.size(); midx++) {
        iplStaticMeshAdd(static_meshes.get(midx), global_state->scene);
    }
    return 0;
}

int SteamAudioGeometry::deregister_geometry() {
    for (int midx = 0; midx < static_meshes.size(); midx++) {
        iplStaticMeshRemove(static_meshes.get(midx), global_state->scene);
    }
    return 0;
}

void SteamAudioGeometry::_bind_methods() {
	ClassDB::bind_method(D_METHOD("create_geometry", "mesh", "mesh_global_transform"), &SteamAudioGeometry::create_geometry);
	ClassDB::bind_method(D_METHOD("destroy_geometry"), &SteamAudioGeometry::destroy_geometry);

	ClassDB::bind_method(D_METHOD("register_geometry"), &SteamAudioGeometry::register_geometry);
	ClassDB::bind_method(D_METHOD("deregister_geometry"), &SteamAudioGeometry::deregister_geometry);

}