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write.cpp
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write.cpp
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// This file is part of gltfpack; see gltfpack.h for version/license details
#include "gltfpack.h"
#include <float.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
static const char* componentType(cgltf_component_type type)
{
switch (type)
{
case cgltf_component_type_r_8:
return "5120";
case cgltf_component_type_r_8u:
return "5121";
case cgltf_component_type_r_16:
return "5122";
case cgltf_component_type_r_16u:
return "5123";
case cgltf_component_type_r_32u:
return "5125";
case cgltf_component_type_r_32f:
return "5126";
default:
return "0";
}
}
static const char* shapeType(cgltf_type type)
{
switch (type)
{
case cgltf_type_scalar:
return "SCALAR";
case cgltf_type_vec2:
return "VEC2";
case cgltf_type_vec3:
return "VEC3";
case cgltf_type_vec4:
return "VEC4";
case cgltf_type_mat2:
return "MAT2";
case cgltf_type_mat3:
return "MAT3";
case cgltf_type_mat4:
return "MAT4";
default:
return "";
}
}
const char* attributeType(cgltf_attribute_type type)
{
switch (type)
{
case cgltf_attribute_type_position:
return "POSITION";
case cgltf_attribute_type_normal:
return "NORMAL";
case cgltf_attribute_type_tangent:
return "TANGENT";
case cgltf_attribute_type_texcoord:
return "TEXCOORD";
case cgltf_attribute_type_color:
return "COLOR";
case cgltf_attribute_type_joints:
return "JOINTS";
case cgltf_attribute_type_weights:
return "WEIGHTS";
default:
return "ATTRIBUTE";
}
}
const char* animationPath(cgltf_animation_path_type type)
{
switch (type)
{
case cgltf_animation_path_type_translation:
return "translation";
case cgltf_animation_path_type_rotation:
return "rotation";
case cgltf_animation_path_type_scale:
return "scale";
case cgltf_animation_path_type_weights:
return "weights";
default:
return "";
}
}
static const char* lightType(cgltf_light_type type)
{
switch (type)
{
case cgltf_light_type_directional:
return "directional";
case cgltf_light_type_point:
return "point";
case cgltf_light_type_spot:
return "spot";
default:
return "";
}
}
static const char* alphaMode(cgltf_alpha_mode mode)
{
switch (mode)
{
case cgltf_alpha_mode_opaque:
return "OPAQUE";
case cgltf_alpha_mode_mask:
return "MASK";
case cgltf_alpha_mode_blend:
return "BLEND";
default:
return "";
}
}
static const char* compressionMode(BufferView::Compression mode)
{
switch (mode)
{
case BufferView::Compression_Attribute:
return "ATTRIBUTES";
case BufferView::Compression_Index:
return "TRIANGLES";
case BufferView::Compression_IndexSequence:
return "INDICES";
default:
return "";
}
}
static const char* compressionFilter(StreamFormat::Filter filter)
{
switch (filter)
{
case StreamFormat::Filter_None:
return "NONE";
case StreamFormat::Filter_Oct:
return "OCTAHEDRAL";
case StreamFormat::Filter_Quat:
return "QUATERNION";
case StreamFormat::Filter_Exp:
return "EXPONENTIAL";
default:
return "";
}
}
static void writeTextureInfo(std::string& json, const cgltf_data* data, const cgltf_texture_view& view, const QuantizationTexture* qt, const char* scale = NULL)
{
assert(view.texture);
bool has_transform = false;
cgltf_texture_transform transform = {};
transform.scale[0] = transform.scale[1] = 1.f;
if (hasValidTransform(view))
{
transform = view.transform;
has_transform = true;
}
if (qt)
{
transform.offset[0] += qt->offset[0];
transform.offset[1] += qt->offset[1];
transform.scale[0] *= qt->scale[0] / float((1 << qt->bits) - 1) * (qt->normalized ? 65535.f : 1.f);
transform.scale[1] *= qt->scale[1] / float((1 << qt->bits) - 1) * (qt->normalized ? 65535.f : 1.f);
has_transform = true;
}
append(json, "{\"index\":");
append(json, size_t(view.texture - data->textures));
if (view.texcoord != 0)
{
append(json, ",\"texCoord\":");
append(json, size_t(view.texcoord));
}
if (scale && view.scale != 1)
{
append(json, ",\"");
append(json, scale);
append(json, "\":");
append(json, view.scale);
}
if (has_transform)
{
append(json, ",\"extensions\":{\"KHR_texture_transform\":{");
append(json, "\"offset\":[");
append(json, transform.offset[0]);
append(json, ",");
append(json, transform.offset[1]);
append(json, "],\"scale\":[");
append(json, transform.scale[0]);
append(json, ",");
append(json, transform.scale[1]);
append(json, "]");
if (transform.rotation != 0.f)
{
append(json, ",\"rotation\":");
append(json, transform.rotation);
}
append(json, "}}");
}
append(json, "}");
}
static const float white[4] = {1, 1, 1, 1};
static const float black[4] = {0, 0, 0, 0};
static void writeMaterialComponent(std::string& json, const cgltf_data* data, const cgltf_pbr_metallic_roughness& pbr, const QuantizationTexture* qt)
{
comma(json);
append(json, "\"pbrMetallicRoughness\":{");
if (memcmp(pbr.base_color_factor, white, 16) != 0)
{
comma(json);
append(json, "\"baseColorFactor\":[");
append(json, pbr.base_color_factor[0]);
append(json, ",");
append(json, pbr.base_color_factor[1]);
append(json, ",");
append(json, pbr.base_color_factor[2]);
append(json, ",");
append(json, pbr.base_color_factor[3]);
append(json, "]");
}
if (pbr.base_color_texture.texture)
{
comma(json);
append(json, "\"baseColorTexture\":");
writeTextureInfo(json, data, pbr.base_color_texture, qt);
}
if (pbr.metallic_factor != 1)
{
comma(json);
append(json, "\"metallicFactor\":");
append(json, pbr.metallic_factor);
}
if (pbr.roughness_factor != 1)
{
comma(json);
append(json, "\"roughnessFactor\":");
append(json, pbr.roughness_factor);
}
if (pbr.metallic_roughness_texture.texture)
{
comma(json);
append(json, "\"metallicRoughnessTexture\":");
writeTextureInfo(json, data, pbr.metallic_roughness_texture, qt);
}
append(json, "}");
}
static void writeMaterialComponent(std::string& json, const cgltf_data* data, const cgltf_pbr_specular_glossiness& pbr, const QuantizationTexture* qt)
{
comma(json);
append(json, "\"KHR_materials_pbrSpecularGlossiness\":{");
if (pbr.diffuse_texture.texture)
{
comma(json);
append(json, "\"diffuseTexture\":");
writeTextureInfo(json, data, pbr.diffuse_texture, qt);
}
if (pbr.specular_glossiness_texture.texture)
{
comma(json);
append(json, "\"specularGlossinessTexture\":");
writeTextureInfo(json, data, pbr.specular_glossiness_texture, qt);
}
if (memcmp(pbr.diffuse_factor, white, 16) != 0)
{
comma(json);
append(json, "\"diffuseFactor\":[");
append(json, pbr.diffuse_factor[0]);
append(json, ",");
append(json, pbr.diffuse_factor[1]);
append(json, ",");
append(json, pbr.diffuse_factor[2]);
append(json, ",");
append(json, pbr.diffuse_factor[3]);
append(json, "]");
}
if (memcmp(pbr.specular_factor, white, 12) != 0)
{
comma(json);
append(json, "\"specularFactor\":[");
append(json, pbr.specular_factor[0]);
append(json, ",");
append(json, pbr.specular_factor[1]);
append(json, ",");
append(json, pbr.specular_factor[2]);
append(json, "]");
}
if (pbr.glossiness_factor != 1)
{
comma(json);
append(json, "\"glossinessFactor\":");
append(json, pbr.glossiness_factor);
}
append(json, "}");
}
static void writeMaterialComponent(std::string& json, const cgltf_data* data, const cgltf_clearcoat& cc, const QuantizationTexture* qt)
{
comma(json);
append(json, "\"KHR_materials_clearcoat\":{");
if (cc.clearcoat_texture.texture)
{
comma(json);
append(json, "\"clearcoatTexture\":");
writeTextureInfo(json, data, cc.clearcoat_texture, qt);
}
if (cc.clearcoat_roughness_texture.texture)
{
comma(json);
append(json, "\"clearcoatRoughnessTexture\":");
writeTextureInfo(json, data, cc.clearcoat_roughness_texture, qt);
}
if (cc.clearcoat_normal_texture.texture)
{
comma(json);
append(json, "\"clearcoatNormalTexture\":");
writeTextureInfo(json, data, cc.clearcoat_normal_texture, qt, "scale");
}
if (cc.clearcoat_factor != 0)
{
comma(json);
append(json, "\"clearcoatFactor\":");
append(json, cc.clearcoat_factor);
}
if (cc.clearcoat_factor != 0)
{
comma(json);
append(json, "\"clearcoatRoughnessFactor\":");
append(json, cc.clearcoat_roughness_factor);
}
append(json, "}");
}
static void writeMaterialComponent(std::string& json, const cgltf_data* data, const cgltf_transmission& tm, const QuantizationTexture* qt)
{
comma(json);
append(json, "\"KHR_materials_transmission\":{");
if (tm.transmission_texture.texture)
{
comma(json);
append(json, "\"transmissionTexture\":");
writeTextureInfo(json, data, tm.transmission_texture, qt);
}
if (tm.transmission_factor != 0)
{
comma(json);
append(json, "\"transmissionFactor\":");
append(json, tm.transmission_factor);
}
append(json, "}");
}
static void writeMaterialComponent(std::string& json, const cgltf_data* data, const cgltf_ior& tm, const QuantizationTexture* qt)
{
(void)data;
(void)qt;
comma(json);
append(json, "\"KHR_materials_ior\":{");
append(json, "\"ior\":");
append(json, tm.ior);
append(json, "}");
}
static void writeMaterialComponent(std::string& json, const cgltf_data* data, const cgltf_specular& tm, const QuantizationTexture* qt)
{
comma(json);
append(json, "\"KHR_materials_specular\":{");
if (tm.specular_texture.texture)
{
comma(json);
append(json, "\"specularTexture\":");
writeTextureInfo(json, data, tm.specular_texture, qt);
}
if (tm.specular_color_texture.texture)
{
comma(json);
append(json, "\"specularColorTexture\":");
writeTextureInfo(json, data, tm.specular_color_texture, qt);
}
if (tm.specular_factor != 1)
{
comma(json);
append(json, "\"specularFactor\":");
append(json, tm.specular_factor);
}
if (memcmp(tm.specular_color_factor, white, 12) != 0)
{
comma(json);
append(json, "\"specularColorFactor\":[");
append(json, tm.specular_color_factor[0]);
append(json, ",");
append(json, tm.specular_color_factor[1]);
append(json, ",");
append(json, tm.specular_color_factor[2]);
append(json, "]");
}
append(json, "}");
}
static void writeMaterialComponent(std::string& json, const cgltf_data* data, const cgltf_sheen& tm, const QuantizationTexture* qt)
{
comma(json);
append(json, "\"KHR_materials_sheen\":{");
if (tm.sheen_color_texture.texture)
{
comma(json);
append(json, "\"sheenColorTexture\":");
writeTextureInfo(json, data, tm.sheen_color_texture, qt);
}
if (tm.sheen_roughness_texture.texture)
{
comma(json);
append(json, "\"sheenRoughnessTexture\":");
writeTextureInfo(json, data, tm.sheen_roughness_texture, qt);
}
if (memcmp(tm.sheen_color_factor, black, 12) != 0)
{
comma(json);
append(json, "\"sheenColorFactor\":[");
append(json, tm.sheen_color_factor[0]);
append(json, ",");
append(json, tm.sheen_color_factor[1]);
append(json, ",");
append(json, tm.sheen_color_factor[2]);
append(json, "]");
}
if (tm.sheen_roughness_factor != 0)
{
comma(json);
append(json, "\"sheenRoughnessFactor\":");
append(json, tm.sheen_roughness_factor);
}
append(json, "}");
}
static void writeMaterialComponent(std::string& json, const cgltf_data* data, const cgltf_volume& tm, const QuantizationPosition* qp, const QuantizationTexture* qt)
{
comma(json);
append(json, "\"KHR_materials_volume\":{");
if (tm.thickness_texture.texture)
{
comma(json);
append(json, "\"thicknessTexture\":");
writeTextureInfo(json, data, tm.thickness_texture, qt);
}
if (tm.thickness_factor != 0)
{
// thickness is in mesh coordinate space which is rescaled by quantization
float node_scale = qp ? qp->scale / float((1 << qp->bits) - 1) * (qp->normalized ? 65535.f : 1.f) : 1.f;
comma(json);
append(json, "\"thicknessFactor\":");
append(json, tm.thickness_factor / node_scale);
}
if (memcmp(tm.attenuation_color, white, 12) != 0)
{
comma(json);
append(json, "\"attenuationColor\":[");
append(json, tm.attenuation_color[0]);
append(json, ",");
append(json, tm.attenuation_color[1]);
append(json, ",");
append(json, tm.attenuation_color[2]);
append(json, "]");
}
if (tm.attenuation_distance != FLT_MAX)
{
comma(json);
append(json, "\"attenuationDistance\":");
append(json, tm.attenuation_distance);
}
append(json, "}");
}
static void writeMaterialComponent(std::string& json, const cgltf_data* data, const cgltf_emissive_strength& tm)
{
(void)data;
comma(json);
append(json, "\"KHR_materials_emissive_strength\":{");
if (tm.emissive_strength != 1)
{
comma(json);
append(json, "\"emissiveStrength\":");
append(json, tm.emissive_strength);
}
append(json, "}");
}
static void writeMaterialComponent(std::string& json, const cgltf_data* data, const cgltf_iridescence& tm, const QuantizationTexture* qt)
{
comma(json);
append(json, "\"KHR_materials_iridescence\":{");
if (tm.iridescence_factor != 0)
{
comma(json);
append(json, "\"iridescenceFactor\":");
append(json, tm.iridescence_factor);
}
if (tm.iridescence_texture.texture)
{
comma(json);
append(json, "\"iridescenceTexture\":");
writeTextureInfo(json, data, tm.iridescence_texture, qt);
}
if (tm.iridescence_ior != 1.3f)
{
comma(json);
append(json, "\"iridescenceIor\":");
append(json, tm.iridescence_ior);
}
if (tm.iridescence_thickness_min != 100.f)
{
comma(json);
append(json, "\"iridescenceThicknessMinimum\":");
append(json, tm.iridescence_thickness_min);
}
if (tm.iridescence_thickness_max != 400.f)
{
comma(json);
append(json, "\"iridescenceThicknessMaximum\":");
append(json, tm.iridescence_thickness_max);
}
if (tm.iridescence_thickness_texture.texture)
{
comma(json);
append(json, "\"iridescenceThicknessTexture\":");
writeTextureInfo(json, data, tm.iridescence_thickness_texture, qt);
}
append(json, "}");
}
void writeMaterial(std::string& json, const cgltf_data* data, const cgltf_material& material, const QuantizationPosition* qp, const QuantizationTexture* qt)
{
if (material.name && *material.name)
{
comma(json);
append(json, "\"name\":\"");
append(json, material.name);
append(json, "\"");
}
if (material.has_pbr_metallic_roughness)
{
writeMaterialComponent(json, data, material.pbr_metallic_roughness, qt);
}
if (material.normal_texture.texture)
{
comma(json);
append(json, "\"normalTexture\":");
writeTextureInfo(json, data, material.normal_texture, qt, "scale");
}
if (material.occlusion_texture.texture)
{
comma(json);
append(json, "\"occlusionTexture\":");
writeTextureInfo(json, data, material.occlusion_texture, qt, "strength");
}
if (material.emissive_texture.texture)
{
comma(json);
append(json, "\"emissiveTexture\":");
writeTextureInfo(json, data, material.emissive_texture, qt);
}
if (memcmp(material.emissive_factor, black, 12) != 0)
{
comma(json);
append(json, "\"emissiveFactor\":[");
append(json, material.emissive_factor[0]);
append(json, ",");
append(json, material.emissive_factor[1]);
append(json, ",");
append(json, material.emissive_factor[2]);
append(json, "]");
}
if (material.alpha_mode != cgltf_alpha_mode_opaque)
{
comma(json);
append(json, "\"alphaMode\":\"");
append(json, alphaMode(material.alpha_mode));
append(json, "\"");
}
if (material.alpha_cutoff != 0.5f)
{
comma(json);
append(json, "\"alphaCutoff\":");
append(json, material.alpha_cutoff);
}
if (material.double_sided)
{
comma(json);
append(json, "\"doubleSided\":true");
}
if (material.has_pbr_specular_glossiness || material.has_clearcoat || material.has_transmission || material.has_ior || material.has_specular || material.has_sheen || material.has_volume || material.has_emissive_strength || material.has_iridescence || material.unlit)
{
comma(json);
append(json, "\"extensions\":{");
if (material.has_pbr_specular_glossiness)
{
writeMaterialComponent(json, data, material.pbr_specular_glossiness, qt);
}
if (material.has_clearcoat)
{
writeMaterialComponent(json, data, material.clearcoat, qt);
}
if (material.has_transmission)
{
writeMaterialComponent(json, data, material.transmission, qt);
}
if (material.has_ior)
{
writeMaterialComponent(json, data, material.ior, qt);
}
if (material.has_specular)
{
writeMaterialComponent(json, data, material.specular, qt);
}
if (material.has_sheen)
{
writeMaterialComponent(json, data, material.sheen, qt);
}
if (material.has_volume)
{
writeMaterialComponent(json, data, material.volume, qp, qt);
}
if (material.has_emissive_strength)
{
writeMaterialComponent(json, data, material.emissive_strength);
}
if (material.has_iridescence)
{
writeMaterialComponent(json, data, material.iridescence, qt);
}
if (material.unlit)
{
comma(json);
append(json, "\"KHR_materials_unlit\":{}");
}
append(json, "}");
}
}
size_t getBufferView(std::vector<BufferView>& views, BufferView::Kind kind, StreamFormat::Filter filter, BufferView::Compression compression, size_t stride, int variant)
{
if (variant >= 0)
{
for (size_t i = 0; i < views.size(); ++i)
{
BufferView& v = views[i];
if (v.kind == kind && v.filter == filter && v.compression == compression && v.stride == stride && v.variant == variant)
return i;
}
}
BufferView view = {kind, filter, compression, stride, variant};
views.push_back(view);
return views.size() - 1;
}
void writeBufferView(std::string& json, BufferView::Kind kind, StreamFormat::Filter filter, size_t count, size_t stride, size_t bin_offset, size_t bin_size, BufferView::Compression compression, size_t compressed_offset, size_t compressed_size)
{
assert(bin_size == count * stride);
// when compression is enabled, we store uncompressed data in buffer 1 and compressed data in buffer 0
// when compression is disabled, we store uncompressed data in buffer 0
size_t buffer = compression != BufferView::Compression_None ? 1 : 0;
append(json, "{\"buffer\":");
append(json, buffer);
append(json, ",\"byteOffset\":");
append(json, bin_offset);
append(json, ",\"byteLength\":");
append(json, bin_size);
if (kind == BufferView::Kind_Vertex)
{
append(json, ",\"byteStride\":");
append(json, stride);
}
if (kind == BufferView::Kind_Vertex || kind == BufferView::Kind_Index)
{
append(json, ",\"target\":");
append(json, (kind == BufferView::Kind_Vertex) ? "34962" : "34963");
}
if (compression != BufferView::Compression_None)
{
append(json, ",\"extensions\":{");
append(json, "\"EXT_meshopt_compression\":{");
append(json, "\"buffer\":0");
append(json, ",\"byteOffset\":");
append(json, size_t(compressed_offset));
append(json, ",\"byteLength\":");
append(json, size_t(compressed_size));
append(json, ",\"byteStride\":");
append(json, stride);
append(json, ",\"mode\":\"");
append(json, compressionMode(compression));
append(json, "\"");
if (filter != StreamFormat::Filter_None)
{
append(json, ",\"filter\":\"");
append(json, compressionFilter(filter));
append(json, "\"");
}
append(json, ",\"count\":");
append(json, count);
append(json, "}}");
}
append(json, "}");
}
static void writeAccessor(std::string& json, size_t view, size_t offset, cgltf_type type, cgltf_component_type component_type, bool normalized, size_t count, const float* min = 0, const float* max = 0, size_t numminmax = 0)
{
append(json, "{\"bufferView\":");
append(json, view);
append(json, ",\"byteOffset\":");
append(json, offset);
append(json, ",\"componentType\":");
append(json, componentType(component_type));
append(json, ",\"count\":");
append(json, count);
append(json, ",\"type\":\"");
append(json, shapeType(type));
append(json, "\"");
if (normalized)
{
append(json, ",\"normalized\":true");
}
if (min && max)
{
assert(numminmax);
append(json, ",\"min\":[");
for (size_t k = 0; k < numminmax; ++k)
{
comma(json);
append(json, min[k]);
}
append(json, "],\"max\":[");
for (size_t k = 0; k < numminmax; ++k)
{
comma(json);
append(json, max[k]);
}
append(json, "]");
}
append(json, "}");
}
static void writeEmbeddedImage(std::string& json, std::vector<BufferView>& views, const char* data, size_t size, const char* mime_type, TextureKind kind)
{
size_t view = getBufferView(views, BufferView::Kind_Image, StreamFormat::Filter_None, BufferView::Compression_None, 1, -1 - kind);
assert(views[view].data.empty());
views[view].data.assign(data, size);
append(json, "\"bufferView\":");
append(json, view);
append(json, ",\"mimeType\":\"");
append(json, mime_type);
append(json, "\"");
}
static std::string decodeUri(const char* uri)
{
std::string result = uri;
if (!result.empty())
{
cgltf_decode_uri(&result[0]);
result.resize(strlen(result.c_str()));
}
return result;
}
void writeSampler(std::string& json, const cgltf_sampler& sampler)
{
if (sampler.mag_filter != 0)
{
comma(json);
append(json, "\"magFilter\":");
append(json, size_t(sampler.mag_filter));
}
if (sampler.min_filter != 0)
{
comma(json);
append(json, "\"minFilter\":");
append(json, size_t(sampler.min_filter));
}
if (sampler.wrap_s != 10497)
{
comma(json);
append(json, "\"wrapS\":");
append(json, size_t(sampler.wrap_s));
}
if (sampler.wrap_t != 10497)
{
comma(json);
append(json, "\"wrapT\":");
append(json, size_t(sampler.wrap_t));
}
}
void writeImage(std::string& json, std::vector<BufferView>& views, const cgltf_image& image, const ImageInfo& info, size_t index, const char* input_path, const Settings& settings)
{
bool dataUri = image.uri && strncmp(image.uri, "data:", 5) == 0;
if (image.uri && !dataUri && !settings.texture_embed)
{
// fast-path: we don't need to read the image to memory
append(json, "\"uri\":\"");
append(json, image.uri);
append(json, "\"");
return;
}
std::string img_data;
std::string mime_type;
if (!readImage(image, input_path, img_data, mime_type))
{
fprintf(stderr, "Warning: unable to read image %d (%s), skipping\n", int(index), image.uri ? image.uri : "?");
return;
}
writeEmbeddedImage(json, views, img_data.c_str(), img_data.size(), mime_type.c_str(), info.kind);
}
void writeEncodedImage(std::string& json, std::vector<BufferView>& views, const cgltf_image& image, const std::string& encoded, const ImageInfo& info, const char* output_path, const Settings& settings)
{
bool dataUri = image.uri && strncmp(image.uri, "data:", 5) == 0;
if (!settings.texture_embed && image.uri && !dataUri && output_path)
{
std::string ktx_uri = getFileName(image.uri) + ".ktx2";
std::string ktx_full_path = getFullPath(decodeUri(ktx_uri.c_str()).c_str(), output_path);
if (writeFile(ktx_full_path.c_str(), encoded))
{
append(json, "\"uri\":\"");
append(json, ktx_uri);
append(json, "\"");
}
else
{
fprintf(stderr, "Warning: unable to save encoded image %s, skipping\n", image.uri);
}
}
else
{
writeEmbeddedImage(json, views, encoded.c_str(), encoded.size(), "image/ktx2", info.kind);
}
}
void writeTexture(std::string& json, const cgltf_texture& texture, const ImageInfo* info, cgltf_data* data, const Settings& settings)
{
if (texture.image)
{
if (texture.sampler)
{
append(json, "\"sampler\":");
append(json, size_t(texture.sampler - data->samplers));
append(json, ",");
}
if (info && settings.texture_mode[info->kind] != TextureMode_Raw)
{
append(json, "\"extensions\":{\"KHR_texture_basisu\":{\"source\":");
append(json, size_t(texture.image - data->images));
append(json, "}}");
}
else
{
append(json, "\"source\":");
append(json, size_t(texture.image - data->images));
}
}
}
void writeMeshAttributes(std::string& json, std::vector<BufferView>& views, std::string& json_accessors, size_t& accr_offset, const Mesh& mesh, int target, const QuantizationPosition& qp, const QuantizationTexture& qt, const Settings& settings)
{
std::string scratch;
for (size_t j = 0; j < mesh.streams.size(); ++j)
{
const Stream& stream = mesh.streams[j];
if (stream.target != target)
continue;
scratch.clear();
StreamFormat format = writeVertexStream(scratch, stream, qp, qt, settings);
BufferView::Compression compression = settings.compress ? BufferView::Compression_Attribute : BufferView::Compression_None;
size_t view = getBufferView(views, BufferView::Kind_Vertex, format.filter, compression, format.stride, stream.type);
size_t offset = views[view].data.size();
views[view].data += scratch;
comma(json_accessors);
if (stream.type == cgltf_attribute_type_position)
{
float min[3] = {};
float max[3] = {};
getPositionBounds(min, max, stream, qp, settings);
writeAccessor(json_accessors, view, offset, format.type, format.component_type, format.normalized, stream.data.size(), min, max, 3);
}
else
{
writeAccessor(json_accessors, view, offset, format.type, format.component_type, format.normalized, stream.data.size());
}
size_t vertex_accr = accr_offset++;
comma(json);
append(json, "\"");
append(json, attributeType(stream.type));
if (stream.type != cgltf_attribute_type_position && stream.type != cgltf_attribute_type_normal && stream.type != cgltf_attribute_type_tangent)
{
append(json, "_");
append(json, size_t(stream.index));
}
append(json, "\":");
append(json, vertex_accr);
}
}
size_t writeMeshIndices(std::vector<BufferView>& views, std::string& json_accessors, size_t& accr_offset, const Mesh& mesh, const Settings& settings)
{
std::string scratch;
StreamFormat format = writeIndexStream(scratch, mesh.indices);
BufferView::Compression compression = settings.compress ? (mesh.type == cgltf_primitive_type_triangles ? BufferView::Compression_Index : BufferView::Compression_IndexSequence) : BufferView::Compression_None;
size_t view = getBufferView(views, BufferView::Kind_Index, StreamFormat::Filter_None, compression, format.stride);
size_t offset = views[view].data.size();
views[view].data += scratch;
comma(json_accessors);
writeAccessor(json_accessors, view, offset, format.type, format.component_type, format.normalized, mesh.indices.size());
size_t index_accr = accr_offset++;
return index_accr;
}
static size_t writeAnimationTime(std::vector<BufferView>& views, std::string& json_accessors, size_t& accr_offset, float mint, int frames, float period, const Settings& settings)
{
std::vector<float> time(frames);
for (int j = 0; j < frames; ++j)
time[j] = mint + float(j) * period;
std::string scratch;