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gltfpack.cpp
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// This file is part of gltfpack; see gltfpack.h for version/license details
#include "gltfpack.h"
#include <algorithm>
#include <locale.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#ifdef __wasi__
#include <unistd.h>
#endif
#include "../src/meshoptimizer.h"
std::string getVersion()
{
char result[32];
snprintf(result, sizeof(result), "%d.%d", MESHOPTIMIZER_VERSION / 1000, (MESHOPTIMIZER_VERSION % 1000) / 10);
return result;
}
static void finalizeBufferViews(std::string& json, std::vector<BufferView>& views, std::string& bin, std::string* fallback, size_t& fallback_size)
{
for (size_t i = 0; i < views.size(); ++i)
{
BufferView& view = views[i];
size_t bin_offset = bin.size();
size_t fallback_offset = fallback_size;
size_t count = view.data.size() / view.stride;
if (view.compression == BufferView::Compression_None)
{
bin += view.data;
}
else
{
switch (view.compression)
{
case BufferView::Compression_Attribute:
compressVertexStream(bin, view.data, count, view.stride);
break;
case BufferView::Compression_Index:
compressIndexStream(bin, view.data, count, view.stride);
break;
case BufferView::Compression_IndexSequence:
compressIndexSequence(bin, view.data, count, view.stride);
break;
default:
assert(!"Unknown compression type");
}
if (fallback)
*fallback += view.data;
fallback_size += view.data.size();
}
size_t raw_offset = (view.compression != BufferView::Compression_None) ? fallback_offset : bin_offset;
comma(json);
writeBufferView(json, view.kind, view.filter, count, view.stride, raw_offset, view.data.size(), view.compression, bin_offset, bin.size() - bin_offset);
// record written bytes for statistics
view.bytes = bin.size() - bin_offset;
// align each bufferView by 4 bytes
bin.resize((bin.size() + 3) & ~3);
if (fallback)
fallback->resize((fallback->size() + 3) & ~3);
fallback_size = (fallback_size + 3) & ~3;
}
}
static void printMeshStats(const std::vector<Mesh>& meshes, const char* name)
{
size_t mesh_triangles = 0;
size_t mesh_vertices = 0;
size_t total_triangles = 0;
size_t total_instances = 0;
size_t total_draws = 0;
for (size_t i = 0; i < meshes.size(); ++i)
{
const Mesh& mesh = meshes[i];
mesh_triangles += mesh.indices.size() / 3;
mesh_vertices += mesh.streams.empty() ? 0 : mesh.streams[0].data.size();
size_t instances = std::max(size_t(1), mesh.nodes.size() + mesh.instances.size());
total_triangles += mesh.indices.size() / 3 * instances;
total_instances += instances;
total_draws += std::max(size_t(1), mesh.nodes.size());
}
printf("%s: %d mesh primitives (%d triangles, %d vertices); %d draw calls (%d instances, %lld triangles)\n", name,
int(meshes.size()), int(mesh_triangles), int(mesh_vertices),
int(total_draws), int(total_instances), (long long)total_triangles);
}
static void printSceneStats(const std::vector<BufferView>& views, const std::vector<Mesh>& meshes, size_t node_offset, size_t mesh_offset, size_t material_offset, size_t json_size, size_t bin_size)
{
size_t bytes[BufferView::Kind_Count] = {};
for (size_t i = 0; i < views.size(); ++i)
{
const BufferView& view = views[i];
bytes[view.kind] += view.bytes;
}
printf("output: %d nodes, %d meshes (%d primitives), %d materials\n", int(node_offset), int(mesh_offset), int(meshes.size()), int(material_offset));
printf("output: JSON %d bytes, buffers %d bytes\n", int(json_size), int(bin_size));
printf("output: buffers: vertex %d bytes, index %d bytes, skin %d bytes, time %d bytes, keyframe %d bytes, instance %d bytes, image %d bytes\n",
int(bytes[BufferView::Kind_Vertex]), int(bytes[BufferView::Kind_Index]), int(bytes[BufferView::Kind_Skin]),
int(bytes[BufferView::Kind_Time]), int(bytes[BufferView::Kind_Keyframe]), int(bytes[BufferView::Kind_Instance]),
int(bytes[BufferView::Kind_Image]));
}
static void printAttributeStats(const std::vector<BufferView>& views, BufferView::Kind kind, const char* name)
{
for (size_t i = 0; i < views.size(); ++i)
{
const BufferView& view = views[i];
if (view.kind != kind)
continue;
const char* variant = "unknown";
switch (kind)
{
case BufferView::Kind_Vertex:
variant = attributeType(cgltf_attribute_type(view.variant));
break;
case BufferView::Kind_Index:
variant = "index";
break;
case BufferView::Kind_Keyframe:
case BufferView::Kind_Instance:
variant = animationPath(cgltf_animation_path_type(view.variant));
break;
default:;
}
size_t count = view.data.size() / view.stride;
printf("stats: %s %s: compressed %d bytes (%.1f bits), raw %d bytes (%d bits)\n",
name, variant,
int(view.bytes), double(view.bytes) / double(count) * 8,
int(view.data.size()), int(view.stride * 8));
}
}
static void printImageStats(const std::vector<BufferView>& views, TextureKind kind, const char* name)
{
size_t bytes = 0;
size_t count = 0;
for (size_t i = 0; i < views.size(); ++i)
{
const BufferView& view = views[i];
if (view.kind != BufferView::Kind_Image)
continue;
if (view.variant != -1 - kind)
continue;
count += 1;
bytes += view.data.size();
}
if (count)
printf("stats: image %s: %d bytes in %d images\n", name, int(bytes), int(count));
}
static bool printReport(const char* path, cgltf_data* data, const std::vector<BufferView>& views, const std::vector<Mesh>& meshes, size_t node_count, size_t mesh_count, size_t material_count, size_t animation_count, size_t json_size, size_t bin_size)
{
size_t bytes[BufferView::Kind_Count] = {};
for (size_t i = 0; i < views.size(); ++i)
{
const BufferView& view = views[i];
bytes[view.kind] += view.bytes;
}
size_t total_triangles = 0;
size_t total_instances = 0;
size_t total_draws = 0;
for (size_t i = 0; i < meshes.size(); ++i)
{
const Mesh& mesh = meshes[i];
size_t instances = std::max(size_t(1), mesh.nodes.size() + mesh.instances.size());
total_triangles += mesh.indices.size() / 3 * instances;
total_instances += instances;
total_draws += std::max(size_t(1), mesh.nodes.size());
}
FILE* out = fopen(path, "wb");
if (!out)
return false;
fprintf(out, "{\n");
fprintf(out, "\t\"generator\": \"gltfpack %s\",\n", getVersion().c_str());
fprintf(out, "\t\"scene\": {\n");
fprintf(out, "\t\t\"nodeCount\": %d,\n", int(node_count));
fprintf(out, "\t\t\"meshCount\": %d,\n", int(mesh_count));
fprintf(out, "\t\t\"materialCount\": %d,\n", int(material_count));
fprintf(out, "\t\t\"textureCount\": %d,\n", int(data->textures_count));
fprintf(out, "\t\t\"animationCount\": %d\n", int(animation_count));
fprintf(out, "\t},\n");
fprintf(out, "\t\"render\": {\n");
fprintf(out, "\t\t\"drawCount\": %d,\n", int(total_draws));
fprintf(out, "\t\t\"instanceCount\": %d,\n", int(total_instances));
fprintf(out, "\t\t\"triangleCount\": %lld\n", (long long)total_triangles);
fprintf(out, "\t},\n");
fprintf(out, "\t\"data\": {\n");
fprintf(out, "\t\t\"json\": %d,\n", int(json_size));
fprintf(out, "\t\t\"binary\": %d,\n", int(bin_size));
fprintf(out, "\t\t\"buffers\": {\n");
fprintf(out, "\t\t\t\"vertex\": %d,\n", int(bytes[BufferView::Kind_Vertex]));
fprintf(out, "\t\t\t\"index\": %d,\n", int(bytes[BufferView::Kind_Index]));
fprintf(out, "\t\t\t\"animation\": %d,\n", int(bytes[BufferView::Kind_Time] + bytes[BufferView::Kind_Keyframe]));
fprintf(out, "\t\t\t\"transform\": %d,\n", int(bytes[BufferView::Kind_Skin] + bytes[BufferView::Kind_Instance]));
fprintf(out, "\t\t\t\"image\": %d\n", int(bytes[BufferView::Kind_Image]));
fprintf(out, "\t\t}\n");
fprintf(out, "\t}\n");
fprintf(out, "}\n");
int rc = fclose(out);
return rc == 0;
}
static bool canTransformMesh(const Mesh& mesh)
{
// volume thickness is specified in mesh coordinate space; to avoid modifying materials we prohibit transforming meshes with volume materials
if (mesh.material && mesh.material->has_volume && mesh.material->volume.thickness_factor > 0.f)
return false;
return true;
}
static void process(cgltf_data* data, const char* input_path, const char* output_path, const char* report_path, std::vector<Mesh>& meshes, std::vector<Animation>& animations, const Settings& settings, std::string& json, std::string& bin, std::string& fallback, size_t& fallback_size)
{
if (settings.verbose)
{
printf("input: %d nodes, %d meshes (%d primitives), %d materials, %d skins, %d animations, %d images\n",
int(data->nodes_count), int(data->meshes_count), int(meshes.size()), int(data->materials_count), int(data->skins_count), int(animations.size()), int(data->images_count));
printMeshStats(meshes, "input");
}
for (size_t i = 0; i < animations.size(); ++i)
{
processAnimation(animations[i], settings);
}
std::vector<NodeInfo> nodes(data->nodes_count);
markScenes(data, nodes);
markAnimated(data, nodes, animations);
for (size_t i = 0; i < meshes.size(); ++i)
{
Mesh& mesh = meshes[i];
assert(mesh.instances.empty());
// mesh is already world space, skip
if (mesh.nodes.empty())
continue;
// note: when -kn is specified, we keep mesh-node attachment so that named nodes can be transformed
if (settings.keep_nodes)
continue;
// we keep skinned meshes or meshes with morph targets as is
// in theory we could transform both, but in practice transforming morph target meshes is more involved,
// and reparenting skinned meshes leads to incorrect bounding box generated in three.js
if (mesh.skin || mesh.targets)
continue;
bool any_animated = false;
for (size_t j = 0; j < mesh.nodes.size(); ++j)
any_animated |= nodes[mesh.nodes[j] - data->nodes].animated;
// animated meshes will be anchored to the same node that they used to be in to retain the animation
if (any_animated)
continue;
int scene = nodes[mesh.nodes[0] - data->nodes].scene;
bool any_other_scene = false;
for (size_t j = 0; j < mesh.nodes.size(); ++j)
any_other_scene |= scene != nodes[mesh.nodes[j] - data->nodes].scene;
// we only merge instances when all nodes have a single consistent scene
if (scene < 0 || any_other_scene)
continue;
// we only merge multiple instances together if requested
// this often makes the scenes faster to render by reducing the draw call count, but can result in larger files
if (mesh.nodes.size() > 1 && !settings.mesh_merge && !settings.mesh_instancing)
continue;
// prefer instancing if possible, use merging otherwise
if (mesh.nodes.size() > 1 && settings.mesh_instancing)
{
mesh.instances.resize(mesh.nodes.size());
for (size_t j = 0; j < mesh.nodes.size(); ++j)
cgltf_node_transform_world(mesh.nodes[j], mesh.instances[j].data);
mesh.nodes.clear();
mesh.scene = scene;
}
else if (canTransformMesh(mesh))
{
mergeMeshInstances(mesh);
assert(mesh.nodes.empty());
mesh.scene = scene;
}
}
// material information is required for mesh and image processing
std::vector<MaterialInfo> materials(data->materials_count);
std::vector<ImageInfo> images(data->images_count);
analyzeMaterials(data, materials, images);
optimizeMaterials(data, input_path, images);
// streams need to be filtered before mesh merging (or processing) to make sure we can merge meshes with redundant streams
for (size_t i = 0; i < meshes.size(); ++i)
{
Mesh& mesh = meshes[i];
MaterialInfo mi = mesh.material ? materials[mesh.material - data->materials] : MaterialInfo();
// merge material requirements across all variants
for (size_t j = 0; j < mesh.variants.size(); ++j)
{
MaterialInfo vi = materials[mesh.variants[j].material - data->materials];
mi.needsTangents |= vi.needsTangents;
mi.textureSetMask |= vi.textureSetMask;
}
filterStreams(mesh, mi);
}
mergeMeshMaterials(data, meshes, settings);
mergeMeshes(meshes, settings);
filterEmptyMeshes(meshes);
markNeededNodes(data, nodes, meshes, animations, settings);
markNeededMaterials(data, materials, meshes, settings);
#ifndef NDEBUG
std::vector<Mesh> debug_meshes;
for (size_t i = 0; i < meshes.size(); ++i)
{
const Mesh& mesh = meshes[i];
if (settings.simplify_debug > 0)
{
Mesh kinds = {};
Mesh loops = {};
debugSimplify(mesh, kinds, loops, settings.simplify_debug);
debug_meshes.push_back(kinds);
debug_meshes.push_back(loops);
}
if (settings.meshlet_debug > 0)
{
Mesh meshlets = {};
Mesh bounds = {};
debugMeshlets(mesh, meshlets, bounds, settings.meshlet_debug, /* scan= */ false);
debug_meshes.push_back(meshlets);
debug_meshes.push_back(bounds);
}
}
#endif
for (size_t i = 0; i < meshes.size(); ++i)
{
processMesh(meshes[i], settings);
}
#ifndef NDEBUG
meshes.insert(meshes.end(), debug_meshes.begin(), debug_meshes.end());
#endif
filterEmptyMeshes(meshes); // some meshes may become empty after processing
QuantizationPosition qp = prepareQuantizationPosition(meshes, settings);
std::vector<QuantizationTexture> qt_materials(materials.size());
std::vector<size_t> qt_meshes(meshes.size(), size_t(-1));
prepareQuantizationTexture(data, qt_materials, qt_meshes, meshes, settings);
QuantizationTexture qt_dummy = {};
qt_dummy.bits = settings.tex_bits;
std::string json_images;
std::string json_samplers;
std::string json_textures;
std::string json_materials;
std::string json_accessors;
std::string json_meshes;
std::string json_nodes;
std::string json_skins;
std::vector<std::string> json_roots(data->scenes_count);
std::string json_animations;
std::string json_cameras;
std::string json_extensions;
std::vector<BufferView> views;
bool ext_pbr_specular_glossiness = false;
bool ext_clearcoat = false;
bool ext_transmission = false;
bool ext_ior = false;
bool ext_specular = false;
bool ext_sheen = false;
bool ext_volume = false;
bool ext_emissive_strength = false;
bool ext_iridescence = false;
bool ext_anisotropy = false;
bool ext_unlit = false;
bool ext_instancing = false;
bool ext_texture_transform = false;
size_t accr_offset = 0;
size_t node_offset = 0;
size_t mesh_offset = 0;
size_t material_offset = 0;
for (size_t i = 0; i < data->samplers_count; ++i)
{
const cgltf_sampler& sampler = data->samplers[i];
comma(json_samplers);
append(json_samplers, "{");
writeSampler(json_samplers, sampler);
append(json_samplers, "}");
}
std::vector<std::string> encoded_images;
#ifdef WITH_BASISU
if (data->images_count && settings.texture_ktx2)
{
encoded_images.resize(data->images_count);
encodeImages(encoded_images.data(), data, images, input_path, settings);
}
#endif
for (size_t i = 0; i < data->images_count; ++i)
{
const cgltf_image& image = data->images[i];
comma(json_images);
append(json_images, "{");
if (encoded_images.size() && !encoded_images[i].empty())
{
if (encoded_images[i].compare(0, 5, "error") == 0)
fprintf(stderr, "Warning: unable to encode image %d (%s), skipping (%s)\n", int(i), image.uri ? image.uri : "?", encoded_images[i].c_str());
else
writeEncodedImage(json_images, views, image, encoded_images[i], images[i], output_path, settings);
encoded_images[i] = std::string(); // reclaim memory early
}
else
{
writeImage(json_images, views, image, images[i], i, input_path, settings);
}
append(json_images, "}");
}
for (size_t i = 0; i < data->textures_count; ++i)
{
const cgltf_texture& texture = data->textures[i];
comma(json_textures);
append(json_textures, "{");
writeTexture(json_textures, texture, texture.image ? &images[texture.image - data->images] : NULL, data, settings);
append(json_textures, "}");
}
for (size_t i = 0; i < data->materials_count; ++i)
{
MaterialInfo& mi = materials[i];
if (!mi.keep)
continue;
const cgltf_material& material = data->materials[i];
comma(json_materials);
append(json_materials, "{");
writeMaterial(json_materials, data, material, settings.quantize && !settings.pos_float ? &qp : NULL, settings.quantize && !settings.tex_float ? &qt_materials[i] : NULL);
if (settings.keep_extras)
writeExtras(json_materials, material.extras);
append(json_materials, "}");
mi.remap = int(material_offset);
material_offset++;
ext_pbr_specular_glossiness = ext_pbr_specular_glossiness || material.has_pbr_specular_glossiness;
ext_clearcoat = ext_clearcoat || material.has_clearcoat;
ext_transmission = ext_transmission || material.has_transmission;
ext_ior = ext_ior || material.has_ior;
ext_specular = ext_specular || material.has_specular;
ext_sheen = ext_sheen || material.has_sheen;
ext_volume = ext_volume || material.has_volume;
ext_emissive_strength = ext_emissive_strength || material.has_emissive_strength;
ext_iridescence = ext_iridescence || material.has_iridescence;
ext_anisotropy = ext_anisotropy || material.has_anisotropy;
ext_unlit = ext_unlit || material.unlit;
ext_texture_transform = ext_texture_transform || mi.usesTextureTransform;
}
for (size_t i = 0; i < meshes.size(); ++i)
{
const Mesh& mesh = meshes[i];
comma(json_meshes);
append(json_meshes, "{\"primitives\":[");
size_t pi = i;
for (; pi < meshes.size(); ++pi)
{
const Mesh& prim = meshes[pi];
if (prim.skin != mesh.skin || prim.targets != mesh.targets)
break;
if (pi > i && (mesh.instances.size() || prim.instances.size()))
break;
if (!compareMeshNodes(mesh, prim))
break;
if (!compareMeshTargets(mesh, prim))
break;
const QuantizationTexture& qt = qt_meshes[pi] == size_t(-1) ? qt_dummy : qt_materials[qt_meshes[pi]];
comma(json_meshes);
append(json_meshes, "{\"attributes\":{");
writeMeshAttributes(json_meshes, views, json_accessors, accr_offset, prim, 0, qp, qt, settings);
append(json_meshes, "}");
if (prim.type != cgltf_primitive_type_triangles)
{
append(json_meshes, ",\"mode\":");
append(json_meshes, size_t(prim.type));
}
if (mesh.targets)
{
append(json_meshes, ",\"targets\":[");
for (size_t j = 0; j < mesh.targets; ++j)
{
comma(json_meshes);
append(json_meshes, "{");
writeMeshAttributes(json_meshes, views, json_accessors, accr_offset, prim, int(1 + j), qp, qt, settings);
append(json_meshes, "}");
}
append(json_meshes, "]");
}
if (!prim.indices.empty())
{
size_t index_accr = writeMeshIndices(views, json_accessors, accr_offset, prim, settings);
append(json_meshes, ",\"indices\":");
append(json_meshes, index_accr);
}
if (prim.material)
{
MaterialInfo& mi = materials[prim.material - data->materials];
assert(mi.keep);
append(json_meshes, ",\"material\":");
append(json_meshes, size_t(mi.remap));
}
if (prim.variants.size())
{
append(json_meshes, ",\"extensions\":{\"KHR_materials_variants\":{\"mappings\":[");
for (size_t j = 0; j < prim.variants.size(); ++j)
{
const cgltf_material_mapping& variant = prim.variants[j];
MaterialInfo& mi = materials[variant.material - data->materials];
assert(mi.keep);
comma(json_meshes);
append(json_meshes, "{\"material\":");
append(json_meshes, size_t(mi.remap));
append(json_meshes, ",\"variants\":[");
append(json_meshes, size_t(variant.variant));
append(json_meshes, "]}");
}
append(json_meshes, "]}}");
}
append(json_meshes, "}");
}
append(json_meshes, "]");
if (mesh.target_weights.size())
{
append(json_meshes, ",\"weights\":[");
for (size_t j = 0; j < mesh.target_weights.size(); ++j)
{
comma(json_meshes);
append(json_meshes, mesh.target_weights[j]);
}
append(json_meshes, "]");
}
if (mesh.target_names.size())
{
append(json_meshes, ",\"extras\":{\"targetNames\":[");
for (size_t j = 0; j < mesh.target_names.size(); ++j)
{
comma(json_meshes);
append(json_meshes, "\"");
append(json_meshes, mesh.target_names[j]);
append(json_meshes, "\"");
}
append(json_meshes, "]}");
}
append(json_meshes, "}");
assert(mesh.nodes.empty() || mesh.instances.empty());
ext_instancing = ext_instancing || !mesh.instances.empty();
if (mesh.nodes.size())
{
for (size_t j = 0; j < mesh.nodes.size(); ++j)
{
NodeInfo& ni = nodes[mesh.nodes[j] - data->nodes];
assert(ni.keep);
// if we don't use position quantization, prefer attaching the mesh to its node directly
if (!ni.has_mesh && (!settings.quantize || settings.pos_float))
{
ni.has_mesh = true;
ni.mesh_index = mesh_offset;
ni.mesh_skin = mesh.skin;
}
else
{
ni.mesh_nodes.push_back(node_offset);
writeMeshNode(json_nodes, mesh_offset, mesh.nodes[j], mesh.skin, data, settings.quantize && !settings.pos_float ? &qp : NULL);
node_offset++;
}
}
}
else if (mesh.instances.size())
{
assert(mesh.scene >= 0);
comma(json_roots[mesh.scene]);
append(json_roots[mesh.scene], node_offset);
size_t instance_accr = writeInstances(views, json_accessors, accr_offset, mesh.instances, qp, settings);
assert(!mesh.skin);
writeMeshNodeInstanced(json_nodes, mesh_offset, instance_accr);
node_offset++;
}
else
{
assert(mesh.scene >= 0);
comma(json_roots[mesh.scene]);
append(json_roots[mesh.scene], node_offset);
writeMeshNode(json_nodes, mesh_offset, NULL, mesh.skin, data, settings.quantize && !settings.pos_float ? &qp : NULL);
node_offset++;
}
mesh_offset++;
// skip all meshes that we've written in this iteration
assert(pi > i);
i = pi - 1;
}
remapNodes(data, nodes, node_offset);
for (size_t i = 0; i < data->nodes_count; ++i)
{
NodeInfo& ni = nodes[i];
if (!ni.keep)
continue;
const cgltf_node& node = data->nodes[i];
comma(json_nodes);
append(json_nodes, "{");
writeNode(json_nodes, node, nodes, data);
if (settings.keep_extras)
writeExtras(json_nodes, node.extras);
append(json_nodes, "}");
}
for (size_t i = 0; i < data->scenes_count; ++i)
{
for (size_t j = 0; j < data->scenes[i].nodes_count; ++j)
{
NodeInfo& ni = nodes[data->scenes[i].nodes[j] - data->nodes];
if (ni.keep)
{
comma(json_roots[i]);
append(json_roots[i], size_t(ni.remap));
}
}
}
for (size_t i = 0; i < data->skins_count; ++i)
{
const cgltf_skin& skin = data->skins[i];
size_t matrix_accr = writeJointBindMatrices(views, json_accessors, accr_offset, skin, qp, settings);
writeSkin(json_skins, skin, matrix_accr, nodes, data);
}
for (size_t i = 0; i < animations.size(); ++i)
{
const Animation& animation = animations[i];
writeAnimation(json_animations, views, json_accessors, accr_offset, animation, i, data, nodes, settings);
}
for (size_t i = 0; i < data->cameras_count; ++i)
{
const cgltf_camera& camera = data->cameras[i];
writeCamera(json_cameras, camera);
}
if (data->lights_count > 0)
{
comma(json_extensions);
append(json_extensions, "\"KHR_lights_punctual\":{\"lights\":[");
for (size_t i = 0; i < data->lights_count; ++i)
{
const cgltf_light& light = data->lights[i];
writeLight(json_extensions, light);
}
append(json_extensions, "]}");
}
if (data->variants_count > 0)
{
comma(json_extensions);
append(json_extensions, "\"KHR_materials_variants\":{\"variants\":[");
for (size_t i = 0; i < data->variants_count; ++i)
{
const cgltf_material_variant& variant = data->variants[i];
comma(json_extensions);
append(json_extensions, "{\"name\":\"");
append(json_extensions, variant.name);
append(json_extensions, "\"}");
}
append(json_extensions, "]}");
}
append(json, "\"asset\":{");
append(json, "\"version\":\"2.0\",\"generator\":\"gltfpack ");
append(json, getVersion());
append(json, "\"");
writeExtras(json, data->asset.extras);
append(json, "}");
const ExtensionInfo extensions[] = {
{"KHR_mesh_quantization", settings.quantize, true},
{"EXT_meshopt_compression", settings.compress, !settings.fallback},
{"KHR_texture_transform", (settings.quantize && !settings.tex_float && !json_textures.empty()) || ext_texture_transform, false},
{"KHR_materials_pbrSpecularGlossiness", ext_pbr_specular_glossiness, false},
{"KHR_materials_clearcoat", ext_clearcoat, false},
{"KHR_materials_transmission", ext_transmission, false},
{"KHR_materials_ior", ext_ior, false},
{"KHR_materials_specular", ext_specular, false},
{"KHR_materials_sheen", ext_sheen, false},
{"KHR_materials_volume", ext_volume, false},
{"KHR_materials_emissive_strength", ext_emissive_strength, false},
{"KHR_materials_iridescence", ext_iridescence, false},
{"KHR_materials_anisotropy", ext_anisotropy, false},
{"KHR_materials_unlit", ext_unlit, false},
{"KHR_materials_variants", data->variants_count > 0, false},
{"KHR_lights_punctual", data->lights_count > 0, false},
{"KHR_texture_basisu", !json_textures.empty() && settings.texture_ktx2, true},
{"EXT_mesh_gpu_instancing", ext_instancing, true},
};
writeExtensions(json, extensions, sizeof(extensions) / sizeof(extensions[0]));
std::string json_views;
finalizeBufferViews(json_views, views, bin, settings.fallback ? &fallback : NULL, fallback_size);
writeArray(json, "bufferViews", json_views);
writeArray(json, "accessors", json_accessors);
writeArray(json, "samplers", json_samplers);
writeArray(json, "images", json_images);
writeArray(json, "textures", json_textures);
writeArray(json, "materials", json_materials);
writeArray(json, "meshes", json_meshes);
writeArray(json, "skins", json_skins);
writeArray(json, "animations", json_animations);
writeArray(json, "nodes", json_nodes);
if (!json_roots.empty())
{
append(json, ",\"scenes\":[");
for (size_t i = 0; i < data->scenes_count; ++i)
writeScene(json, data->scenes[i], json_roots[i]);
append(json, "]");
}
writeArray(json, "cameras", json_cameras);
if (data->scene)
{
append(json, ",\"scene\":");
append(json, size_t(data->scene - data->scenes));
}
if (!json_extensions.empty())
{
append(json, ",\"extensions\":{");
append(json, json_extensions);
append(json, "}");
}
if (settings.verbose)
{
printMeshStats(meshes, "output");
printSceneStats(views, meshes, node_offset, mesh_offset, material_offset, json.size(), bin.size());
}
if (settings.verbose > 1)
{
printAttributeStats(views, BufferView::Kind_Vertex, "vertex");
printAttributeStats(views, BufferView::Kind_Index, "index");
printAttributeStats(views, BufferView::Kind_Keyframe, "keyframe");
printAttributeStats(views, BufferView::Kind_Instance, "instance");
printImageStats(views, TextureKind_Generic, "generic");
printImageStats(views, TextureKind_Color, "color");
printImageStats(views, TextureKind_Normal, "normal");
printImageStats(views, TextureKind_Attrib, "attrib");
}
if (report_path)
{
if (!printReport(report_path, data, views, meshes, node_offset, mesh_offset, material_offset, animations.size(), json.size(), bin.size()))
{
fprintf(stderr, "Warning: cannot save report to %s\n", report_path);
}
}
}
static void writeU32(FILE* out, uint32_t data)
{
fwrite(&data, 4, 1, out);
}
static const char* getBaseName(const char* path)
{
const char* slash = strrchr(path, '/');
const char* backslash = strrchr(path, '\\');
const char* rs = slash ? slash + 1 : path;
const char* bs = backslash ? backslash + 1 : path;
return std::max(rs, bs);
}
static std::string getBufferSpec(const char* bin_path, size_t bin_size, const char* fallback_path, size_t fallback_size, bool fallback_ref)
{
std::string json;
append(json, "\"buffers\":[");
append(json, "{");
if (bin_path)
{
append(json, "\"uri\":\"");
append(json, bin_path);
append(json, "\"");
}
comma(json);
append(json, "\"byteLength\":");
append(json, bin_size);
append(json, "}");
if (fallback_ref)
{
comma(json);
append(json, "{");
if (fallback_path)
{
append(json, "\"uri\":\"");
append(json, fallback_path);
append(json, "\"");
}
comma(json);
append(json, "\"byteLength\":");
append(json, fallback_size);
append(json, ",\"extensions\":{");
append(json, "\"EXT_meshopt_compression\":{");
append(json, "\"fallback\":true");
append(json, "}}");
append(json, "}");
}
append(json, "]");
return json;
}
int gltfpack(const char* input, const char* output, const char* report, Settings settings)
{
cgltf_data* data = 0;
std::vector<Mesh> meshes;
std::vector<Animation> animations;
std::string iext = getExtension(input);
std::string oext = output ? getExtension(output) : "";
if (iext == ".gltf" || iext == ".glb")
{
const char* error = 0;
data = parseGltf(input, meshes, animations, &error);
if (error)
{
fprintf(stderr, "Error loading %s: %s\n", input, error);
return 2;
}
}
else if (iext == ".obj")
{
const char* error = 0;
data = parseObj(input, meshes, &error);
if (!data)
{
fprintf(stderr, "Error loading %s: %s\n", input, error);
return 2;
}
}
else
{
fprintf(stderr, "Error loading %s: unknown extension (expected .gltf or .glb or .obj)\n", input);
return 2;
}
#ifndef WITH_BASISU
if (data->images_count && settings.texture_ktx2)
{
fprintf(stderr, "Error: gltfpack was built without BasisU support, texture compression is not available\n");
#ifdef __wasi__
fprintf(stderr, "Note: node.js builds do not support BasisU due to lack of platform features; download a native build from https://github.com/zeux/meshoptimizer/releases\n");
#endif
return 3;
}
#endif
if (oext == ".glb")
{
settings.texture_embed = true;
}