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cgltf_write.h
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/**
* cgltf_write - a single-file glTF 2.0 writer written in C99.
*
* Version: 1.13
*
* Website: https://github.com/jkuhlmann/cgltf
*
* Distributed under the MIT License, see notice at the end of this file.
*
* Building:
* Include this file where you need the struct and function
* declarations. Have exactly one source file where you define
* `CGLTF_WRITE_IMPLEMENTATION` before including this file to get the
* function definitions.
*
* Reference:
* `cgltf_result cgltf_write_file(const cgltf_options* options, const char*
* path, const cgltf_data* data)` writes a glTF data to the given file path.
* If `options->type` is `cgltf_file_type_glb`, both JSON content and binary
* buffer of the given glTF data will be written in a GLB format.
* Otherwise, only the JSON part will be written.
* External buffers and images are not written out. `data` is not deallocated.
*
* `cgltf_size cgltf_write(const cgltf_options* options, char* buffer,
* cgltf_size size, const cgltf_data* data)` writes JSON into the given memory
* buffer. Returns the number of bytes written to `buffer`, including a null
* terminator. If buffer is null, returns the number of bytes that would have
* been written. `data` is not deallocated.
*
* To write custom JSON into the `extras` field, aggregate all the custom JSON
* into a single buffer, then set `json` to this buffer. By supplying
* start_offset and end_offset values for various objects, you can select a
* range of characters within the aggregated buffer.
*/
#ifndef CGLTF_WRITE_H_INCLUDED__
#define CGLTF_WRITE_H_INCLUDED__
#include "cgltf.h"
#include <stddef.h>
#include <stdbool.h>
#ifdef __cplusplus
extern "C" {
#endif
cgltf_result cgltf_write_file(const cgltf_options* options, const char* path, const cgltf_data* data);
cgltf_size cgltf_write(const cgltf_options* options, char* buffer, cgltf_size size, const cgltf_data* data);
#ifdef __cplusplus
}
#endif
#endif /* #ifndef CGLTF_WRITE_H_INCLUDED__ */
/*
*
* Stop now, if you are only interested in the API.
* Below, you find the implementation.
*
*/
#if defined(__INTELLISENSE__) || defined(__JETBRAINS_IDE__)
/* This makes MSVC/CLion intellisense work. */
#define CGLTF_WRITE_IMPLEMENTATION
#endif
#ifdef CGLTF_WRITE_IMPLEMENTATION
#include <assert.h>
#include <stdio.h>
#include <stdint.h>
#include <stdlib.h>
#include <string.h>
#include <float.h>
#define CGLTF_EXTENSION_FLAG_TEXTURE_TRANSFORM (1 << 0)
#define CGLTF_EXTENSION_FLAG_MATERIALS_UNLIT (1 << 1)
#define CGLTF_EXTENSION_FLAG_SPECULAR_GLOSSINESS (1 << 2)
#define CGLTF_EXTENSION_FLAG_LIGHTS_PUNCTUAL (1 << 3)
#define CGLTF_EXTENSION_FLAG_DRACO_MESH_COMPRESSION (1 << 4)
#define CGLTF_EXTENSION_FLAG_MATERIALS_CLEARCOAT (1 << 5)
#define CGLTF_EXTENSION_FLAG_MATERIALS_IOR (1 << 6)
#define CGLTF_EXTENSION_FLAG_MATERIALS_SPECULAR (1 << 7)
#define CGLTF_EXTENSION_FLAG_MATERIALS_TRANSMISSION (1 << 8)
#define CGLTF_EXTENSION_FLAG_MATERIALS_SHEEN (1 << 9)
#define CGLTF_EXTENSION_FLAG_MATERIALS_VARIANTS (1 << 10)
#define CGLTF_EXTENSION_FLAG_MATERIALS_VOLUME (1 << 11)
#define CGLTF_EXTENSION_FLAG_TEXTURE_BASISU (1 << 12)
#define CGLTF_EXTENSION_FLAG_MATERIALS_EMISSIVE_STRENGTH (1 << 13)
#define CGLTF_EXTENSION_FLAG_MESH_GPU_INSTANCING (1 << 14)
#define CGLTF_EXTENSION_FLAG_MATERIALS_IRIDESCENCE (1 << 15)
typedef struct {
char* buffer;
cgltf_size buffer_size;
cgltf_size remaining;
char* cursor;
cgltf_size tmp;
cgltf_size chars_written;
const cgltf_data* data;
int depth;
const char* indent;
int needs_comma;
uint32_t extension_flags;
uint32_t required_extension_flags;
} cgltf_write_context;
#define CGLTF_MIN(a, b) (a < b ? a : b)
#ifdef FLT_DECIMAL_DIG
// FLT_DECIMAL_DIG is C11
#define CGLTF_DECIMAL_DIG (FLT_DECIMAL_DIG)
#else
#define CGLTF_DECIMAL_DIG 9
#endif
#define CGLTF_SPRINTF(...) { \
assert(context->cursor || (!context->cursor && context->remaining == 0)); \
context->tmp = snprintf ( context->cursor, context->remaining, __VA_ARGS__ ); \
context->chars_written += context->tmp; \
if (context->cursor) { \
context->cursor += context->tmp; \
context->remaining -= context->tmp; \
} }
#define CGLTF_SNPRINTF(length, ...) { \
assert(context->cursor || (!context->cursor && context->remaining == 0)); \
context->tmp = snprintf ( context->cursor, CGLTF_MIN(length + 1, context->remaining), __VA_ARGS__ ); \
context->chars_written += length; \
if (context->cursor) { \
context->cursor += length; \
context->remaining -= length; \
} }
#define CGLTF_WRITE_IDXPROP(label, val, start) if (val) { \
cgltf_write_indent(context); \
CGLTF_SPRINTF("\"%s\": %d", label, (int) (val - start)); \
context->needs_comma = 1; }
#define CGLTF_WRITE_IDXARRPROP(label, dim, vals, start) if (vals) { \
cgltf_write_indent(context); \
CGLTF_SPRINTF("\"%s\": [", label); \
for (int i = 0; i < (int)(dim); ++i) { \
int idx = (int) (vals[i] - start); \
if (i != 0) CGLTF_SPRINTF(","); \
CGLTF_SPRINTF(" %d", idx); \
} \
CGLTF_SPRINTF(" ]"); \
context->needs_comma = 1; }
#define CGLTF_WRITE_TEXTURE_INFO(label, info) if (info.texture) { \
cgltf_write_line(context, "\"" label "\": {"); \
CGLTF_WRITE_IDXPROP("index", info.texture, context->data->textures); \
cgltf_write_intprop(context, "texCoord", info.texcoord, 0); \
cgltf_write_floatprop(context, "scale", info.scale, 1.0f); \
if (info.has_transform) { \
context->extension_flags |= CGLTF_EXTENSION_FLAG_TEXTURE_TRANSFORM; \
cgltf_write_texture_transform(context, &info.transform); \
} \
cgltf_write_extras(context, &info.extras); \
cgltf_write_line(context, "}"); }
#ifndef CGLTF_CONSTS
static const cgltf_size GlbHeaderSize = 12;
static const cgltf_size GlbChunkHeaderSize = 8;
static const uint32_t GlbVersion = 2;
static const uint32_t GlbMagic = 0x46546C67;
static const uint32_t GlbMagicJsonChunk = 0x4E4F534A;
static const uint32_t GlbMagicBinChunk = 0x004E4942;
#define CGLTF_CONSTS
#endif
static void cgltf_write_indent(cgltf_write_context* context)
{
if (context->needs_comma)
{
CGLTF_SPRINTF(",\n");
context->needs_comma = 0;
}
else
{
CGLTF_SPRINTF("\n");
}
for (int i = 0; i < context->depth; ++i)
{
CGLTF_SPRINTF("%s", context->indent);
}
}
static void cgltf_write_line(cgltf_write_context* context, const char* line)
{
if (line[0] == ']' || line[0] == '}')
{
--context->depth;
context->needs_comma = 0;
}
cgltf_write_indent(context);
CGLTF_SPRINTF("%s", line);
cgltf_size last = (cgltf_size)(strlen(line) - 1);
if (line[0] == ']' || line[0] == '}')
{
context->needs_comma = 1;
}
if (line[last] == '[' || line[last] == '{')
{
++context->depth;
context->needs_comma = 0;
}
}
static void cgltf_write_strprop(cgltf_write_context* context, const char* label, const char* val)
{
if (val)
{
cgltf_write_indent(context);
CGLTF_SPRINTF("\"%s\": \"%s\"", label, val);
context->needs_comma = 1;
}
}
static void cgltf_write_extras(cgltf_write_context* context, const cgltf_extras* extras)
{
cgltf_size length = extras->end_offset - extras->start_offset;
if (length > 0 && context->data->json)
{
char* json_string = ((char*) context->data->json) + extras->start_offset;
cgltf_write_indent(context);
CGLTF_SPRINTF("%s", "\"extras\": ");
CGLTF_SNPRINTF(length, "%.*s", (int)(extras->end_offset - extras->start_offset), json_string);
context->needs_comma = 1;
}
}
static void cgltf_write_stritem(cgltf_write_context* context, const char* item)
{
cgltf_write_indent(context);
CGLTF_SPRINTF("\"%s\"", item);
context->needs_comma = 1;
}
static void cgltf_write_intprop(cgltf_write_context* context, const char* label, int val, int def)
{
if (val != def)
{
cgltf_write_indent(context);
CGLTF_SPRINTF("\"%s\": %d", label, val);
context->needs_comma = 1;
}
}
static void cgltf_write_sizeprop(cgltf_write_context* context, const char* label, cgltf_size val, cgltf_size def)
{
if (val != def)
{
cgltf_write_indent(context);
CGLTF_SPRINTF("\"%s\": %zu", label, val);
context->needs_comma = 1;
}
}
static void cgltf_write_floatprop(cgltf_write_context* context, const char* label, float val, float def)
{
if (val != def)
{
cgltf_write_indent(context);
CGLTF_SPRINTF("\"%s\": ", label);
CGLTF_SPRINTF("%.*g", CGLTF_DECIMAL_DIG, val);
context->needs_comma = 1;
if (context->cursor)
{
char *decimal_comma = strchr(context->cursor - context->tmp, ',');
if (decimal_comma)
{
*decimal_comma = '.';
}
}
}
}
static void cgltf_write_boolprop_optional(cgltf_write_context* context, const char* label, bool val, bool def)
{
if (val != def)
{
cgltf_write_indent(context);
CGLTF_SPRINTF("\"%s\": %s", label, val ? "true" : "false");
context->needs_comma = 1;
}
}
static void cgltf_write_floatarrayprop(cgltf_write_context* context, const char* label, const cgltf_float* vals, cgltf_size dim)
{
cgltf_write_indent(context);
CGLTF_SPRINTF("\"%s\": [", label);
for (cgltf_size i = 0; i < dim; ++i)
{
if (i != 0)
{
CGLTF_SPRINTF(", %.*g", CGLTF_DECIMAL_DIG, vals[i]);
}
else
{
CGLTF_SPRINTF("%.*g", CGLTF_DECIMAL_DIG, vals[i]);
}
}
CGLTF_SPRINTF("]");
context->needs_comma = 1;
}
static bool cgltf_check_floatarray(const float* vals, int dim, float val) {
while (dim--)
{
if (vals[dim] != val)
{
return true;
}
}
return false;
}
static int cgltf_int_from_component_type(cgltf_component_type ctype)
{
switch (ctype)
{
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* cgltf_str_from_alpha_mode(cgltf_alpha_mode alpha_mode)
{
switch (alpha_mode)
{
case cgltf_alpha_mode_mask: return "MASK";
case cgltf_alpha_mode_blend: return "BLEND";
default: return NULL;
}
}
static const char* cgltf_str_from_type(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 NULL;
}
}
static cgltf_size cgltf_dim_from_type(cgltf_type type)
{
switch (type)
{
case cgltf_type_scalar: return 1;
case cgltf_type_vec2: return 2;
case cgltf_type_vec3: return 3;
case cgltf_type_vec4: return 4;
case cgltf_type_mat2: return 4;
case cgltf_type_mat3: return 9;
case cgltf_type_mat4: return 16;
default: return 0;
}
}
static const char* cgltf_str_from_camera_type(cgltf_camera_type camera_type)
{
switch (camera_type)
{
case cgltf_camera_type_perspective: return "perspective";
case cgltf_camera_type_orthographic: return "orthographic";
default: return NULL;
}
}
static const char* cgltf_str_from_light_type(cgltf_light_type light_type)
{
switch (light_type)
{
case cgltf_light_type_directional: return "directional";
case cgltf_light_type_point: return "point";
case cgltf_light_type_spot: return "spot";
default: return NULL;
}
}
static void cgltf_write_texture_transform(cgltf_write_context* context, const cgltf_texture_transform* transform)
{
cgltf_write_line(context, "\"extensions\": {");
cgltf_write_line(context, "\"KHR_texture_transform\": {");
if (cgltf_check_floatarray(transform->offset, 2, 0.0f))
{
cgltf_write_floatarrayprop(context, "offset", transform->offset, 2);
}
cgltf_write_floatprop(context, "rotation", transform->rotation, 0.0f);
if (cgltf_check_floatarray(transform->scale, 2, 1.0f))
{
cgltf_write_floatarrayprop(context, "scale", transform->scale, 2);
}
if (transform->has_texcoord)
{
cgltf_write_intprop(context, "texCoord", transform->texcoord, -1);
}
cgltf_write_line(context, "}");
cgltf_write_line(context, "}");
}
static void cgltf_write_asset(cgltf_write_context* context, const cgltf_asset* asset)
{
cgltf_write_line(context, "\"asset\": {");
cgltf_write_strprop(context, "copyright", asset->copyright);
cgltf_write_strprop(context, "generator", asset->generator);
cgltf_write_strprop(context, "version", asset->version);
cgltf_write_strprop(context, "min_version", asset->min_version);
cgltf_write_extras(context, &asset->extras);
cgltf_write_line(context, "}");
}
static void cgltf_write_primitive(cgltf_write_context* context, const cgltf_primitive* prim)
{
cgltf_write_intprop(context, "mode", (int) prim->type, 4);
CGLTF_WRITE_IDXPROP("indices", prim->indices, context->data->accessors);
CGLTF_WRITE_IDXPROP("material", prim->material, context->data->materials);
cgltf_write_line(context, "\"attributes\": {");
for (cgltf_size i = 0; i < prim->attributes_count; ++i)
{
const cgltf_attribute* attr = prim->attributes + i;
CGLTF_WRITE_IDXPROP(attr->name, attr->data, context->data->accessors);
}
cgltf_write_line(context, "}");
if (prim->targets_count)
{
cgltf_write_line(context, "\"targets\": [");
for (cgltf_size i = 0; i < prim->targets_count; ++i)
{
cgltf_write_line(context, "{");
for (cgltf_size j = 0; j < prim->targets[i].attributes_count; ++j)
{
const cgltf_attribute* attr = prim->targets[i].attributes + j;
CGLTF_WRITE_IDXPROP(attr->name, attr->data, context->data->accessors);
}
cgltf_write_line(context, "}");
}
cgltf_write_line(context, "]");
}
cgltf_write_extras(context, &prim->extras);
if (prim->has_draco_mesh_compression || prim->mappings_count > 0)
{
cgltf_write_line(context, "\"extensions\": {");
if (prim->has_draco_mesh_compression)
{
context->extension_flags |= CGLTF_EXTENSION_FLAG_DRACO_MESH_COMPRESSION;
if (prim->attributes_count == 0 || prim->indices == 0)
{
context->required_extension_flags |= CGLTF_EXTENSION_FLAG_DRACO_MESH_COMPRESSION;
}
cgltf_write_line(context, "\"KHR_draco_mesh_compression\": {");
CGLTF_WRITE_IDXPROP("bufferView", prim->draco_mesh_compression.buffer_view, context->data->buffer_views);
cgltf_write_line(context, "\"attributes\": {");
for (cgltf_size i = 0; i < prim->draco_mesh_compression.attributes_count; ++i)
{
const cgltf_attribute* attr = prim->draco_mesh_compression.attributes + i;
CGLTF_WRITE_IDXPROP(attr->name, attr->data, context->data->accessors);
}
cgltf_write_line(context, "}");
cgltf_write_line(context, "}");
}
if (prim->mappings_count > 0)
{
context->extension_flags |= CGLTF_EXTENSION_FLAG_MATERIALS_VARIANTS;
cgltf_write_line(context, "\"KHR_materials_variants\": {");
cgltf_write_line(context, "\"mappings\": [");
for (cgltf_size i = 0; i < prim->mappings_count; ++i)
{
const cgltf_material_mapping* map = prim->mappings + i;
cgltf_write_line(context, "{");
CGLTF_WRITE_IDXPROP("material", map->material, context->data->materials);
cgltf_write_indent(context);
CGLTF_SPRINTF("\"variants\": [%d]", (int)map->variant);
context->needs_comma = 1;
cgltf_write_extras(context, &map->extras);
cgltf_write_line(context, "}");
}
cgltf_write_line(context, "]");
cgltf_write_line(context, "}");
}
cgltf_write_line(context, "}");
}
}
static void cgltf_write_mesh(cgltf_write_context* context, const cgltf_mesh* mesh)
{
cgltf_write_line(context, "{");
cgltf_write_strprop(context, "name", mesh->name);
cgltf_write_line(context, "\"primitives\": [");
for (cgltf_size i = 0; i < mesh->primitives_count; ++i)
{
cgltf_write_line(context, "{");
cgltf_write_primitive(context, mesh->primitives + i);
cgltf_write_line(context, "}");
}
cgltf_write_line(context, "]");
if (mesh->weights_count > 0)
{
cgltf_write_floatarrayprop(context, "weights", mesh->weights, mesh->weights_count);
}
cgltf_write_extras(context, &mesh->extras);
cgltf_write_line(context, "}");
}
static void cgltf_write_buffer_view(cgltf_write_context* context, const cgltf_buffer_view* view)
{
cgltf_write_line(context, "{");
cgltf_write_strprop(context, "name", view->name);
CGLTF_WRITE_IDXPROP("buffer", view->buffer, context->data->buffers);
cgltf_write_sizeprop(context, "byteLength", view->size, (cgltf_size)-1);
cgltf_write_sizeprop(context, "byteOffset", view->offset, 0);
cgltf_write_sizeprop(context, "byteStride", view->stride, 0);
// NOTE: We skip writing "target" because the spec says its usage can be inferred.
cgltf_write_extras(context, &view->extras);
cgltf_write_line(context, "}");
}
static void cgltf_write_buffer(cgltf_write_context* context, const cgltf_buffer* buffer)
{
cgltf_write_line(context, "{");
cgltf_write_strprop(context, "name", buffer->name);
cgltf_write_strprop(context, "uri", buffer->uri);
cgltf_write_sizeprop(context, "byteLength", buffer->size, (cgltf_size)-1);
cgltf_write_extras(context, &buffer->extras);
cgltf_write_line(context, "}");
}
static void cgltf_write_material(cgltf_write_context* context, const cgltf_material* material)
{
cgltf_write_line(context, "{");
cgltf_write_strprop(context, "name", material->name);
if (material->alpha_mode == cgltf_alpha_mode_mask)
{
cgltf_write_floatprop(context, "alphaCutoff", material->alpha_cutoff, 0.5f);
}
cgltf_write_boolprop_optional(context, "doubleSided", (bool)material->double_sided, false);
// cgltf_write_boolprop_optional(context, "unlit", material->unlit, false);
if (material->unlit)
{
context->extension_flags |= CGLTF_EXTENSION_FLAG_MATERIALS_UNLIT;
}
if (material->has_pbr_specular_glossiness)
{
context->extension_flags |= CGLTF_EXTENSION_FLAG_SPECULAR_GLOSSINESS;
}
if (material->has_clearcoat)
{
context->extension_flags |= CGLTF_EXTENSION_FLAG_MATERIALS_CLEARCOAT;
}
if (material->has_transmission)
{
context->extension_flags |= CGLTF_EXTENSION_FLAG_MATERIALS_TRANSMISSION;
}
if (material->has_volume)
{
context->extension_flags |= CGLTF_EXTENSION_FLAG_MATERIALS_VOLUME;
}
if (material->has_ior)
{
context->extension_flags |= CGLTF_EXTENSION_FLAG_MATERIALS_IOR;
}
if (material->has_specular)
{
context->extension_flags |= CGLTF_EXTENSION_FLAG_MATERIALS_SPECULAR;
}
if (material->has_sheen)
{
context->extension_flags |= CGLTF_EXTENSION_FLAG_MATERIALS_SHEEN;
}
if (material->has_emissive_strength)
{
context->extension_flags |= CGLTF_EXTENSION_FLAG_MATERIALS_EMISSIVE_STRENGTH;
}
if (material->has_iridescence)
{
context->extension_flags |= CGLTF_EXTENSION_FLAG_MATERIALS_IRIDESCENCE;
}
if (material->has_pbr_metallic_roughness)
{
const cgltf_pbr_metallic_roughness* params = &material->pbr_metallic_roughness;
cgltf_write_line(context, "\"pbrMetallicRoughness\": {");
CGLTF_WRITE_TEXTURE_INFO("baseColorTexture", params->base_color_texture);
CGLTF_WRITE_TEXTURE_INFO("metallicRoughnessTexture", params->metallic_roughness_texture);
cgltf_write_floatprop(context, "metallicFactor", params->metallic_factor, 1.0f);
cgltf_write_floatprop(context, "roughnessFactor", params->roughness_factor, 1.0f);
if (cgltf_check_floatarray(params->base_color_factor, 4, 1.0f))
{
cgltf_write_floatarrayprop(context, "baseColorFactor", params->base_color_factor, 4);
}
cgltf_write_extras(context, ¶ms->extras);
cgltf_write_line(context, "}");
}
if (material->unlit || material->has_pbr_specular_glossiness || material->has_clearcoat || material->has_ior || material->has_specular || material->has_transmission || material->has_sheen || material->has_volume || material->has_emissive_strength || material->has_iridescence)
{
cgltf_write_line(context, "\"extensions\": {");
if (material->has_clearcoat)
{
const cgltf_clearcoat* params = &material->clearcoat;
cgltf_write_line(context, "\"KHR_materials_clearcoat\": {");
CGLTF_WRITE_TEXTURE_INFO("clearcoatTexture", params->clearcoat_texture);
CGLTF_WRITE_TEXTURE_INFO("clearcoatRoughnessTexture", params->clearcoat_roughness_texture);
CGLTF_WRITE_TEXTURE_INFO("clearcoatNormalTexture", params->clearcoat_normal_texture);
cgltf_write_floatprop(context, "clearcoatFactor", params->clearcoat_factor, 0.0f);
cgltf_write_floatprop(context, "clearcoatRoughnessFactor", params->clearcoat_roughness_factor, 0.0f);
cgltf_write_line(context, "}");
}
if (material->has_ior)
{
const cgltf_ior* params = &material->ior;
cgltf_write_line(context, "\"KHR_materials_ior\": {");
cgltf_write_floatprop(context, "ior", params->ior, 1.5f);
cgltf_write_line(context, "}");
}
if (material->has_specular)
{
const cgltf_specular* params = &material->specular;
cgltf_write_line(context, "\"KHR_materials_specular\": {");
CGLTF_WRITE_TEXTURE_INFO("specularTexture", params->specular_texture);
CGLTF_WRITE_TEXTURE_INFO("specularColorTexture", params->specular_color_texture);
cgltf_write_floatprop(context, "specularFactor", params->specular_factor, 1.0f);
if (cgltf_check_floatarray(params->specular_color_factor, 3, 1.0f))
{
cgltf_write_floatarrayprop(context, "specularColorFactor", params->specular_color_factor, 3);
}
cgltf_write_line(context, "}");
}
if (material->has_transmission)
{
const cgltf_transmission* params = &material->transmission;
cgltf_write_line(context, "\"KHR_materials_transmission\": {");
CGLTF_WRITE_TEXTURE_INFO("transmissionTexture", params->transmission_texture);
cgltf_write_floatprop(context, "transmissionFactor", params->transmission_factor, 0.0f);
cgltf_write_line(context, "}");
}
if (material->has_volume)
{
const cgltf_volume* params = &material->volume;
cgltf_write_line(context, "\"KHR_materials_volume\": {");
CGLTF_WRITE_TEXTURE_INFO("thicknessTexture", params->thickness_texture);
cgltf_write_floatprop(context, "thicknessFactor", params->thickness_factor, 0.0f);
if (cgltf_check_floatarray(params->attenuation_color, 3, 1.0f))
{
cgltf_write_floatarrayprop(context, "attenuationColor", params->attenuation_color, 3);
}
if (params->attenuation_distance < FLT_MAX)
{
cgltf_write_floatprop(context, "attenuationDistance", params->attenuation_distance, FLT_MAX);
}
cgltf_write_line(context, "}");
}
if (material->has_sheen)
{
const cgltf_sheen* params = &material->sheen;
cgltf_write_line(context, "\"KHR_materials_sheen\": {");
CGLTF_WRITE_TEXTURE_INFO("sheenColorTexture", params->sheen_color_texture);
CGLTF_WRITE_TEXTURE_INFO("sheenRoughnessTexture", params->sheen_roughness_texture);
if (cgltf_check_floatarray(params->sheen_color_factor, 3, 0.0f))
{
cgltf_write_floatarrayprop(context, "sheenColorFactor", params->sheen_color_factor, 3);
}
cgltf_write_floatprop(context, "sheenRoughnessFactor", params->sheen_roughness_factor, 0.0f);
cgltf_write_line(context, "}");
}
if (material->has_pbr_specular_glossiness)
{
const cgltf_pbr_specular_glossiness* params = &material->pbr_specular_glossiness;
cgltf_write_line(context, "\"KHR_materials_pbrSpecularGlossiness\": {");
CGLTF_WRITE_TEXTURE_INFO("diffuseTexture", params->diffuse_texture);
CGLTF_WRITE_TEXTURE_INFO("specularGlossinessTexture", params->specular_glossiness_texture);
if (cgltf_check_floatarray(params->diffuse_factor, 4, 1.0f))
{
cgltf_write_floatarrayprop(context, "diffuseFactor", params->diffuse_factor, 4);
}
if (cgltf_check_floatarray(params->specular_factor, 3, 1.0f))
{
cgltf_write_floatarrayprop(context, "specularFactor", params->specular_factor, 3);
}
cgltf_write_floatprop(context, "glossinessFactor", params->glossiness_factor, 1.0f);
cgltf_write_line(context, "}");
}
if (material->unlit)
{
cgltf_write_line(context, "\"KHR_materials_unlit\": {}");
}
if (material->has_emissive_strength)
{
cgltf_write_line(context, "\"KHR_materials_emissive_strength\": {");
const cgltf_emissive_strength* params = &material->emissive_strength;
cgltf_write_floatprop(context, "emissiveStrength", params->emissive_strength, 1.f);
cgltf_write_line(context, "}");
}
if (material->has_iridescence)
{
cgltf_write_line(context, "\"KHR_materials_iridescence\": {");
const cgltf_iridescence* params = &material->iridescence;
cgltf_write_floatprop(context, "iridescenceFactor", params->iridescence_factor, 0.f);
CGLTF_WRITE_TEXTURE_INFO("iridescenceTexture", params->iridescence_texture);
cgltf_write_floatprop(context, "iridescenceIor", params->iridescence_ior, 1.3f);
cgltf_write_floatprop(context, "iridescenceThicknessMinimum", params->iridescence_thickness_min, 100.f);
cgltf_write_floatprop(context, "iridescenceThicknessMaximum", params->iridescence_thickness_max, 400.f);
CGLTF_WRITE_TEXTURE_INFO("iridescenceThicknessTexture", params->iridescence_thickness_texture);
cgltf_write_line(context, "}");
}
cgltf_write_line(context, "}");
}
CGLTF_WRITE_TEXTURE_INFO("normalTexture", material->normal_texture);
CGLTF_WRITE_TEXTURE_INFO("occlusionTexture", material->occlusion_texture);
CGLTF_WRITE_TEXTURE_INFO("emissiveTexture", material->emissive_texture);
if (cgltf_check_floatarray(material->emissive_factor, 3, 0.0f))
{
cgltf_write_floatarrayprop(context, "emissiveFactor", material->emissive_factor, 3);
}
cgltf_write_strprop(context, "alphaMode", cgltf_str_from_alpha_mode(material->alpha_mode));
cgltf_write_extras(context, &material->extras);
cgltf_write_line(context, "}");
}
static void cgltf_write_image(cgltf_write_context* context, const cgltf_image* image)
{
cgltf_write_line(context, "{");
cgltf_write_strprop(context, "name", image->name);
cgltf_write_strprop(context, "uri", image->uri);
CGLTF_WRITE_IDXPROP("bufferView", image->buffer_view, context->data->buffer_views);
cgltf_write_strprop(context, "mimeType", image->mime_type);
cgltf_write_extras(context, &image->extras);
cgltf_write_line(context, "}");
}
static void cgltf_write_texture(cgltf_write_context* context, const cgltf_texture* texture)
{
cgltf_write_line(context, "{");
cgltf_write_strprop(context, "name", texture->name);
CGLTF_WRITE_IDXPROP("source", texture->image, context->data->images);
CGLTF_WRITE_IDXPROP("sampler", texture->sampler, context->data->samplers);
if (texture->has_basisu)
{
cgltf_write_line(context, "\"extensions\": {");
{
context->extension_flags |= CGLTF_EXTENSION_FLAG_TEXTURE_BASISU;
cgltf_write_line(context, "\"KHR_texture_basisu\": {");
CGLTF_WRITE_IDXPROP("source", texture->basisu_image, context->data->images);
cgltf_write_line(context, "}");
}
cgltf_write_line(context, "}");
}
cgltf_write_extras(context, &texture->extras);
cgltf_write_line(context, "}");
}
static void cgltf_write_skin(cgltf_write_context* context, const cgltf_skin* skin)
{
cgltf_write_line(context, "{");
CGLTF_WRITE_IDXPROP("skeleton", skin->skeleton, context->data->nodes);
CGLTF_WRITE_IDXPROP("inverseBindMatrices", skin->inverse_bind_matrices, context->data->accessors);
CGLTF_WRITE_IDXARRPROP("joints", skin->joints_count, skin->joints, context->data->nodes);
cgltf_write_strprop(context, "name", skin->name);
cgltf_write_extras(context, &skin->extras);
cgltf_write_line(context, "}");
}
static const char* cgltf_write_str_path_type(cgltf_animation_path_type path_type)
{
switch (path_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:
break;
}
return "invalid";
}
static const char* cgltf_write_str_interpolation_type(cgltf_interpolation_type interpolation_type)
{
switch (interpolation_type)
{
case cgltf_interpolation_type_linear:
return "LINEAR";
case cgltf_interpolation_type_step:
return "STEP";
case cgltf_interpolation_type_cubic_spline:
return "CUBICSPLINE";
default:
break;
}
return "invalid";
}
static void cgltf_write_path_type(cgltf_write_context* context, const char *label, cgltf_animation_path_type path_type)
{
cgltf_write_strprop(context, label, cgltf_write_str_path_type(path_type));
}
static void cgltf_write_interpolation_type(cgltf_write_context* context, const char *label, cgltf_interpolation_type interpolation_type)
{
cgltf_write_strprop(context, label, cgltf_write_str_interpolation_type(interpolation_type));
}
static void cgltf_write_animation_sampler(cgltf_write_context* context, const cgltf_animation_sampler* animation_sampler)
{
cgltf_write_line(context, "{");
cgltf_write_interpolation_type(context, "interpolation", animation_sampler->interpolation);
CGLTF_WRITE_IDXPROP("input", animation_sampler->input, context->data->accessors);
CGLTF_WRITE_IDXPROP("output", animation_sampler->output, context->data->accessors);
cgltf_write_extras(context, &animation_sampler->extras);
cgltf_write_line(context, "}");
}
static void cgltf_write_animation_channel(cgltf_write_context* context, const cgltf_animation* animation, const cgltf_animation_channel* animation_channel)
{
cgltf_write_line(context, "{");
CGLTF_WRITE_IDXPROP("sampler", animation_channel->sampler, animation->samplers);
cgltf_write_line(context, "\"target\": {");
CGLTF_WRITE_IDXPROP("node", animation_channel->target_node, context->data->nodes);
cgltf_write_path_type(context, "path", animation_channel->target_path);
cgltf_write_line(context, "}");
cgltf_write_extras(context, &animation_channel->extras);
cgltf_write_line(context, "}");
}
static void cgltf_write_animation(cgltf_write_context* context, const cgltf_animation* animation)
{
cgltf_write_line(context, "{");
cgltf_write_strprop(context, "name", animation->name);
if (animation->samplers_count > 0)
{
cgltf_write_line(context, "\"samplers\": [");
for (cgltf_size i = 0; i < animation->samplers_count; ++i)
{
cgltf_write_animation_sampler(context, animation->samplers + i);
}
cgltf_write_line(context, "]");
}
if (animation->channels_count > 0)
{
cgltf_write_line(context, "\"channels\": [");
for (cgltf_size i = 0; i < animation->channels_count; ++i)
{
cgltf_write_animation_channel(context, animation, animation->channels + i);
}
cgltf_write_line(context, "]");
}
cgltf_write_extras(context, &animation->extras);
cgltf_write_line(context, "}");
}
static void cgltf_write_sampler(cgltf_write_context* context, const cgltf_sampler* sampler)
{
cgltf_write_line(context, "{");
cgltf_write_strprop(context, "name", sampler->name);
cgltf_write_intprop(context, "magFilter", sampler->mag_filter, 0);
cgltf_write_intprop(context, "minFilter", sampler->min_filter, 0);
cgltf_write_intprop(context, "wrapS", sampler->wrap_s, 10497);
cgltf_write_intprop(context, "wrapT", sampler->wrap_t, 10497);
cgltf_write_extras(context, &sampler->extras);
cgltf_write_line(context, "}");
}
static void cgltf_write_node(cgltf_write_context* context, const cgltf_node* node)
{
cgltf_write_line(context, "{");
CGLTF_WRITE_IDXARRPROP("children", node->children_count, node->children, context->data->nodes);
CGLTF_WRITE_IDXPROP("mesh", node->mesh, context->data->meshes);
cgltf_write_strprop(context, "name", node->name);
if (node->has_matrix)
{
cgltf_write_floatarrayprop(context, "matrix", node->matrix, 16);
}
if (node->has_translation)
{
cgltf_write_floatarrayprop(context, "translation", node->translation, 3);
}
if (node->has_rotation)
{
cgltf_write_floatarrayprop(context, "rotation", node->rotation, 4);
}
if (node->has_scale)
{
cgltf_write_floatarrayprop(context, "scale", node->scale, 3);
}
if (node->skin)
{
CGLTF_WRITE_IDXPROP("skin", node->skin, context->data->skins);
}
bool has_extension = node->light || (node->has_mesh_gpu_instancing && node->mesh_gpu_instancing.attributes_count > 0);
if(has_extension)
cgltf_write_line(context, "\"extensions\": {");
if (node->light)
{
context->extension_flags |= CGLTF_EXTENSION_FLAG_LIGHTS_PUNCTUAL;
cgltf_write_line(context, "\"KHR_lights_punctual\": {");
CGLTF_WRITE_IDXPROP("light", node->light, context->data->lights);
cgltf_write_line(context, "}");
}
if (node->has_mesh_gpu_instancing && node->mesh_gpu_instancing.attributes_count > 0)
{
context->extension_flags |= CGLTF_EXTENSION_FLAG_MESH_GPU_INSTANCING;
context->required_extension_flags |= CGLTF_EXTENSION_FLAG_MESH_GPU_INSTANCING;
cgltf_write_line(context, "\"EXT_mesh_gpu_instancing\": {");
{
CGLTF_WRITE_IDXPROP("bufferView", node->mesh_gpu_instancing.buffer_view, context->data->buffer_views);
cgltf_write_line(context, "\"attributes\": {");
{
for (cgltf_size i = 0; i < node->mesh_gpu_instancing.attributes_count; ++i)
{
const cgltf_attribute* attr = node->mesh_gpu_instancing.attributes + i;
CGLTF_WRITE_IDXPROP(attr->name, attr->data, context->data->accessors);
}
}
cgltf_write_line(context, "}");
}
cgltf_write_line(context, "}");
}
if (has_extension)
cgltf_write_line(context, "}");
if (node->weights_count > 0)
{
cgltf_write_floatarrayprop(context, "weights", node->weights, node->weights_count);
}
if (node->camera)
{
CGLTF_WRITE_IDXPROP("camera", node->camera, context->data->cameras);
}
cgltf_write_extras(context, &node->extras);
cgltf_write_line(context, "}");
}
static void cgltf_write_scene(cgltf_write_context* context, const cgltf_scene* scene)
{
cgltf_write_line(context, "{");
cgltf_write_strprop(context, "name", scene->name);
CGLTF_WRITE_IDXARRPROP("nodes", scene->nodes_count, scene->nodes, context->data->nodes);
cgltf_write_extras(context, &scene->extras);
cgltf_write_line(context, "}");
}
static void cgltf_write_accessor(cgltf_write_context* context, const cgltf_accessor* accessor)
{
cgltf_write_line(context, "{");
cgltf_write_strprop(context, "name", accessor->name);
CGLTF_WRITE_IDXPROP("bufferView", accessor->buffer_view, context->data->buffer_views);
cgltf_write_intprop(context, "componentType", cgltf_int_from_component_type(accessor->component_type), 0);
cgltf_write_strprop(context, "type", cgltf_str_from_type(accessor->type));