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1/**
2 * cgltf_write - a single-file glTF 2.0 writer written in C99.
3 *
4 * Version: 1.7
5 *
6 * Website: https://github.com/jkuhlmann/cgltf
7 *
8 * Distributed under the MIT License, see notice at the end of this file.
9 *
10 * Building:
11 * Include this file where you need the struct and function
12 * declarations. Have exactly one source file where you define
13 * `CGLTF_WRITE_IMPLEMENTATION` before including this file to get the
14 * function definitions.
15 *
16 * Reference:
17 * `cgltf_result cgltf_write_file(const cgltf_options* options, const char*
18 * path, const cgltf_data* data)` writes JSON to the given file path. Buffer
19 * files and external images are not written out. `data` is not deallocated.
20 *
21 * `cgltf_size cgltf_write(const cgltf_options* options, char* buffer,
22 * cgltf_size size, const cgltf_data* data)` writes JSON into the given memory
23 * buffer. Returns the number of bytes written to `buffer`, including a null
24 * terminator. If buffer is null, returns the number of bytes that would have
25 * been written. `data` is not deallocated.
26 *
27 * To write custom JSON into the `extras` field, aggregate all the custom JSON
28 * into a single buffer, then set `file_data` to this buffer. By supplying
29 * start_offset and end_offset values for various objects, you can select a
30 * range of characters within the aggregated buffer.
31 */
32#ifndef CGLTF_WRITE_H_INCLUDED__
33#define CGLTF_WRITE_H_INCLUDED__
34
35#include "cgltf.h"
36
37#include <stddef.h>
38#include <stdbool.h>
39
40#ifdef __cplusplus
41extern "C" {
42#endif
43
44cgltf_result cgltf_write_file(const cgltf_options* options, const char* path, const cgltf_data* data);
45cgltf_size cgltf_write(const cgltf_options* options, char* buffer, cgltf_size size, const cgltf_data* data);
46
47#ifdef __cplusplus
48}
49#endif
50
51#endif /* #ifndef CGLTF_WRITE_H_INCLUDED__ */
52
53/*
54 *
55 * Stop now, if you are only interested in the API.
56 * Below, you find the implementation.
57 *
58 */
59
60#if defined(__INTELLISENSE__) || defined(__JETBRAINS_IDE__)
61/* This makes MSVC/CLion intellisense work. */
62#define CGLTF_IMPLEMENTATION
63#endif
64
65#ifdef CGLTF_WRITE_IMPLEMENTATION
66
67#include <stdio.h>
68#include <stdint.h>
69#include <stdlib.h>
70#include <string.h>
71
72#define CGLTF_EXTENSION_FLAG_TEXTURE_TRANSFORM (1 << 0)
73#define CGLTF_EXTENSION_FLAG_MATERIALS_UNLIT (1 << 1)
74#define CGLTF_EXTENSION_FLAG_SPECULAR_GLOSSINESS (1 << 2)
75#define CGLTF_EXTENSION_FLAG_LIGHTS_PUNCTUAL (1 << 3)
76#define CGLTF_EXTENSION_FLAG_DRACO_MESH_COMPRESSION (1 << 4)
77#define CGLTF_EXTENSION_FLAG_MATERIALS_CLEARCOAT (1 << 5)
78#define CGLTF_EXTENSION_FLAG_MATERIALS_IOR (1 << 6)
79#define CGLTF_EXTENSION_FLAG_MATERIALS_SPECULAR (1 << 7)
80#define CGLTF_EXTENSION_FLAG_MATERIALS_TRANSMISSION (1 << 8)
81
82typedef struct {
83 char* buffer;
84 cgltf_size buffer_size;
85 cgltf_size remaining;
86 char* cursor;
87 cgltf_size tmp;
88 cgltf_size chars_written;
89 const cgltf_data* data;
90 int depth;
91 const char* indent;
92 int needs_comma;
93 uint32_t extension_flags;
94 uint32_t required_extension_flags;
95} cgltf_write_context;
96
97#define CGLTF_MIN(a, b) (a < b ? a : b)
98
99#define CGLTF_SPRINTF(...) { \
100 context->tmp = snprintf ( context->cursor, context->remaining, __VA_ARGS__ ); \
101 context->chars_written += context->tmp; \
102 if (context->cursor) { \
103 context->cursor += context->tmp; \
104 context->remaining -= context->tmp; \
105 } }
106
107#define CGLTF_SNPRINTF(length, ...) { \
108 context->tmp = snprintf ( context->cursor, CGLTF_MIN(length + 1, context->remaining), __VA_ARGS__ ); \
109 context->chars_written += length; \
110 if (context->cursor) { \
111 context->cursor += length; \
112 context->remaining -= length; \
113 } }
114
115#define CGLTF_WRITE_IDXPROP(label, val, start) if (val) { \
116 cgltf_write_indent(context); \
117 CGLTF_SPRINTF("\"%s\": %d", label, (int) (val - start)); \
118 context->needs_comma = 1; }
119
120#define CGLTF_WRITE_IDXARRPROP(label, dim, vals, start) if (vals) { \
121 cgltf_write_indent(context); \
122 CGLTF_SPRINTF("\"%s\": [", label); \
123 for (int i = 0; i < (int)(dim); ++i) { \
124 int idx = (int) (vals[i] - start); \
125 if (i != 0) CGLTF_SPRINTF(","); \
126 CGLTF_SPRINTF(" %d", idx); \
127 } \
128 CGLTF_SPRINTF(" ]"); \
129 context->needs_comma = 1; }
130
131#define CGLTF_WRITE_TEXTURE_INFO(label, info) if (info.texture) { \
132 cgltf_write_line(context, "\"" label "\": {"); \
133 CGLTF_WRITE_IDXPROP("index", info.texture, context->data->textures); \
134 cgltf_write_intprop(context, "texCoord", info.texcoord, 0); \
135 cgltf_write_floatprop(context, "scale", info.scale, 1.0f); \
136 if (info.has_transform) { \
137 context->extension_flags |= CGLTF_EXTENSION_FLAG_TEXTURE_TRANSFORM; \
138 cgltf_write_texture_transform(context, &info.transform); \
139 } \
140 cgltf_write_extras(context, &info.extras); \
141 cgltf_write_line(context, "}"); }
142
143static void cgltf_write_indent(cgltf_write_context* context)
144{
145 if (context->needs_comma)
146 {
147 CGLTF_SPRINTF(",\n");
148 context->needs_comma = 0;
149 }
150 else
151 {
152 CGLTF_SPRINTF("\n");
153 }
154 for (int i = 0; i < context->depth; ++i)
155 {
156 CGLTF_SPRINTF("%s", context->indent);
157 }
158}
159
160static void cgltf_write_line(cgltf_write_context* context, const char* line)
161{
162 if (line[0] == ']' || line[0] == '}')
163 {
164 --context->depth;
165 context->needs_comma = 0;
166 }
167 cgltf_write_indent(context);
168 CGLTF_SPRINTF("%s", line);
169 cgltf_size last = (cgltf_size)(strlen(line) - 1);
170 if (line[0] == ']' || line[0] == '}')
171 {
172 context->needs_comma = 1;
173 }
174 if (line[last] == '[' || line[last] == '{')
175 {
176 ++context->depth;
177 context->needs_comma = 0;
178 }
179}
180
181static void cgltf_write_strprop(cgltf_write_context* context, const char* label, const char* val)
182{
183 if (val)
184 {
185 cgltf_write_indent(context);
186 CGLTF_SPRINTF("\"%s\": \"%s\"", label, val);
187 context->needs_comma = 1;
188 }
189}
190
191static void cgltf_write_extras(cgltf_write_context* context, const cgltf_extras* extras)
192{
193 cgltf_size length = extras->end_offset - extras->start_offset;
194 if (length > 0 && context->data->file_data)
195 {
196 char* json_string = ((char*) context->data->file_data) + extras->start_offset;
197 cgltf_write_indent(context);
198 CGLTF_SPRINTF("%s", "\"extras\": ");
199 CGLTF_SNPRINTF(length, "%s", json_string);
200 context->needs_comma = 1;
201 }
202}
203
204static void cgltf_write_stritem(cgltf_write_context* context, const char* item)
205{
206 cgltf_write_indent(context);
207 CGLTF_SPRINTF("\"%s\"", item);
208 context->needs_comma = 1;
209}
210
211static void cgltf_write_intprop(cgltf_write_context* context, const char* label, int val, int def)
212{
213 if (val != def)
214 {
215 cgltf_write_indent(context);
216 CGLTF_SPRINTF("\"%s\": %d", label, val);
217 context->needs_comma = 1;
218 }
219}
220
221static void cgltf_write_floatprop(cgltf_write_context* context, const char* label, float val, float def)
222{
223 if (val != def)
224 {
225 cgltf_write_indent(context);
226 CGLTF_SPRINTF("\"%s\": ", label);
227 CGLTF_SPRINTF("%g", val);
228 context->needs_comma = 1;
229
230 if (context->cursor)
231 {
232 char *decimal_comma = strchr(context->cursor - context->tmp, ',');
233 if (decimal_comma)
234 {
235 *decimal_comma = '.';
236 }
237 }
238 }
239}
240
241static void cgltf_write_boolprop_optional(cgltf_write_context* context, const char* label, bool val, bool def)
242{
243 if (val != def)
244 {
245 cgltf_write_indent(context);
246 CGLTF_SPRINTF("\"%s\": %s", label, val ? "true" : "false");
247 context->needs_comma = 1;
248 }
249}
250
251static void cgltf_write_floatarrayprop(cgltf_write_context* context, const char* label, const cgltf_float* vals, cgltf_size dim)
252{
253 cgltf_write_indent(context);
254 CGLTF_SPRINTF("\"%s\": [", label);
255 for (cgltf_size i = 0; i < dim; ++i)
256 {
257 if (i != 0)
258 {
259 CGLTF_SPRINTF(", %g", vals[i]);
260 }
261 else
262 {
263 CGLTF_SPRINTF("%g", vals[i]);
264 }
265 }
266 CGLTF_SPRINTF("]");
267 context->needs_comma = 1;
268}
269
270static bool cgltf_check_floatarray(const float* vals, int dim, float val) {
271 while (dim--)
272 {
273 if (vals[dim] != val)
274 {
275 return true;
276 }
277 }
278 return false;
279}
280
281static int cgltf_int_from_component_type(cgltf_component_type ctype)
282{
283 switch (ctype)
284 {
285 case cgltf_component_type_r_8: return 5120;
286 case cgltf_component_type_r_8u: return 5121;
287 case cgltf_component_type_r_16: return 5122;
288 case cgltf_component_type_r_16u: return 5123;
289 case cgltf_component_type_r_32u: return 5125;
290 case cgltf_component_type_r_32f: return 5126;
291 default: return 0;
292 }
293}
294
295static const char* cgltf_str_from_alpha_mode(cgltf_alpha_mode alpha_mode)
296{
297 switch (alpha_mode)
298 {
299 case cgltf_alpha_mode_mask: return "MASK";
300 case cgltf_alpha_mode_blend: return "BLEND";
301 default: return NULL;
302 }
303}
304
305static const char* cgltf_str_from_type(cgltf_type type)
306{
307 switch (type)
308 {
309 case cgltf_type_scalar: return "SCALAR";
310 case cgltf_type_vec2: return "VEC2";
311 case cgltf_type_vec3: return "VEC3";
312 case cgltf_type_vec4: return "VEC4";
313 case cgltf_type_mat2: return "MAT2";
314 case cgltf_type_mat3: return "MAT3";
315 case cgltf_type_mat4: return "MAT4";
316 default: return NULL;
317 }
318}
319
320static cgltf_size cgltf_dim_from_type(cgltf_type type)
321{
322 switch (type)
323 {
324 case cgltf_type_scalar: return 1;
325 case cgltf_type_vec2: return 2;
326 case cgltf_type_vec3: return 3;
327 case cgltf_type_vec4: return 4;
328 case cgltf_type_mat2: return 4;
329 case cgltf_type_mat3: return 9;
330 case cgltf_type_mat4: return 16;
331 default: return 0;
332 }
333}
334
335static const char* cgltf_str_from_camera_type(cgltf_camera_type camera_type)
336{
337 switch (camera_type)
338 {
339 case cgltf_camera_type_perspective: return "perspective";
340 case cgltf_camera_type_orthographic: return "orthographic";
341 default: return NULL;
342 }
343}
344
345static const char* cgltf_str_from_light_type(cgltf_light_type light_type)
346{
347 switch (light_type)
348 {
349 case cgltf_light_type_directional: return "directional";
350 case cgltf_light_type_point: return "point";
351 case cgltf_light_type_spot: return "spot";
352 default: return NULL;
353 }
354}
355
356static void cgltf_write_texture_transform(cgltf_write_context* context, const cgltf_texture_transform* transform)
357{
358 cgltf_write_line(context, "\"extensions\": {");
359 cgltf_write_line(context, "\"KHR_texture_transform\": {");
360 if (cgltf_check_floatarray(transform->offset, 2, 0.0f))
361 {
362 cgltf_write_floatarrayprop(context, "offset", transform->offset, 2);
363 }
364 cgltf_write_floatprop(context, "rotation", transform->rotation, 0.0f);
365 if (cgltf_check_floatarray(transform->scale, 2, 1.0f))
366 {
367 cgltf_write_floatarrayprop(context, "scale", transform->scale, 2);
368 }
369 cgltf_write_intprop(context, "texCoord", transform->texcoord, 0);
370 cgltf_write_line(context, "}");
371 cgltf_write_line(context, "}");
372}
373
374static void cgltf_write_asset(cgltf_write_context* context, const cgltf_asset* asset)
375{
376 cgltf_write_line(context, "\"asset\": {");
377 cgltf_write_strprop(context, "copyright", asset->copyright);
378 cgltf_write_strprop(context, "generator", asset->generator);
379 cgltf_write_strprop(context, "version", asset->version);
380 cgltf_write_strprop(context, "min_version", asset->min_version);
381 cgltf_write_extras(context, &asset->extras);
382 cgltf_write_line(context, "}");
383}
384
385static void cgltf_write_primitive(cgltf_write_context* context, const cgltf_primitive* prim)
386{
387 cgltf_write_intprop(context, "mode", (int) prim->type, 4);
388 CGLTF_WRITE_IDXPROP("indices", prim->indices, context->data->accessors);
389 CGLTF_WRITE_IDXPROP("material", prim->material, context->data->materials);
390 cgltf_write_line(context, "\"attributes\": {");
391 for (cgltf_size i = 0; i < prim->attributes_count; ++i)
392 {
393 const cgltf_attribute* attr = prim->attributes + i;
394 CGLTF_WRITE_IDXPROP(attr->name, attr->data, context->data->accessors);
395 }
396 cgltf_write_line(context, "}");
397
398 if (prim->targets_count)
399 {
400 cgltf_write_line(context, "\"targets\": [");
401 for (cgltf_size i = 0; i < prim->targets_count; ++i)
402 {
403 cgltf_write_line(context, "{");
404 for (cgltf_size j = 0; j < prim->targets[i].attributes_count; ++j)
405 {
406 const cgltf_attribute* attr = prim->targets[i].attributes + j;
407 CGLTF_WRITE_IDXPROP(attr->name, attr->data, context->data->accessors);
408 }
409 cgltf_write_line(context, "}");
410 }
411 cgltf_write_line(context, "]");
412 }
413 cgltf_write_extras(context, &prim->extras);
414
415 cgltf_bool has_extensions = prim->has_draco_mesh_compression;
416 if (has_extensions) {
417 cgltf_write_line(context, "\"extensions\": {");
418
419 if (prim->has_draco_mesh_compression) {
420 context->extension_flags |= CGLTF_EXTENSION_FLAG_DRACO_MESH_COMPRESSION;
421 if (prim->attributes_count == 0 || prim->indices == 0) {
422 context->required_extension_flags |= CGLTF_EXTENSION_FLAG_DRACO_MESH_COMPRESSION;
423 }
424
425 cgltf_write_line(context, "\"KHR_draco_mesh_compression\": {");
426 CGLTF_WRITE_IDXPROP("bufferView", prim->draco_mesh_compression.buffer_view, context->data->buffer_views);
427 cgltf_write_line(context, "\"attributes\": {");
428 for (cgltf_size i = 0; i < prim->draco_mesh_compression.attributes_count; ++i)
429 {
430 const cgltf_attribute* attr = prim->draco_mesh_compression.attributes + i;
431 CGLTF_WRITE_IDXPROP(attr->name, attr->data, context->data->accessors);
432 }
433 cgltf_write_line(context, "}");
434 cgltf_write_line(context, "}");
435 }
436
437 cgltf_write_line(context, "}");
438 }
439}
440
441static void cgltf_write_mesh(cgltf_write_context* context, const cgltf_mesh* mesh)
442{
443 cgltf_write_line(context, "{");
444 cgltf_write_strprop(context, "name", mesh->name);
445
446 cgltf_write_line(context, "\"primitives\": [");
447 for (cgltf_size i = 0; i < mesh->primitives_count; ++i)
448 {
449 cgltf_write_line(context, "{");
450 cgltf_write_primitive(context, mesh->primitives + i);
451 cgltf_write_line(context, "}");
452 }
453 cgltf_write_line(context, "]");
454
455 if (mesh->weights_count > 0)
456 {
457 cgltf_write_floatarrayprop(context, "weights", mesh->weights, mesh->weights_count);
458 }
459 cgltf_write_extras(context, &mesh->extras);
460 cgltf_write_line(context, "}");
461}
462
463static void cgltf_write_buffer_view(cgltf_write_context* context, const cgltf_buffer_view* view)
464{
465 cgltf_write_line(context, "{");
466 CGLTF_WRITE_IDXPROP("buffer", view->buffer, context->data->buffers);
467 cgltf_write_intprop(context, "byteLength", (int)view->size, -1);
468 cgltf_write_intprop(context, "byteOffset", (int)view->offset, 0);
469 cgltf_write_intprop(context, "byteStride", (int)view->stride, 0);
470 // NOTE: We skip writing "target" because the spec says its usage can be inferred.
471 cgltf_write_extras(context, &view->extras);
472 cgltf_write_line(context, "}");
473}
474
475
476static void cgltf_write_buffer(cgltf_write_context* context, const cgltf_buffer* buffer)
477{
478 cgltf_write_line(context, "{");
479 cgltf_write_strprop(context, "uri", buffer->uri);
480 cgltf_write_intprop(context, "byteLength", (int)buffer->size, -1);
481 cgltf_write_extras(context, &buffer->extras);
482 cgltf_write_line(context, "}");
483}
484
485static void cgltf_write_material(cgltf_write_context* context, const cgltf_material* material)
486{
487 cgltf_write_line(context, "{");
488 cgltf_write_strprop(context, "name", material->name);
489 cgltf_write_floatprop(context, "alphaCutoff", material->alpha_cutoff, 0.5f);
490 cgltf_write_boolprop_optional(context, "doubleSided", material->double_sided, false);
491 // cgltf_write_boolprop_optional(context, "unlit", material->unlit, false);
492
493 if (material->unlit)
494 {
495 context->extension_flags |= CGLTF_EXTENSION_FLAG_MATERIALS_UNLIT;
496 }
497
498 if (material->has_pbr_specular_glossiness)
499 {
500 context->extension_flags |= CGLTF_EXTENSION_FLAG_SPECULAR_GLOSSINESS;
501 }
502
503 if (material->has_clearcoat)
504 {
505 context->extension_flags |= CGLTF_EXTENSION_FLAG_MATERIALS_CLEARCOAT;
506 }
507
508 if (material->has_transmission)
509 {
510 context->extension_flags |= CGLTF_EXTENSION_FLAG_MATERIALS_TRANSMISSION;
511 }
512
513 if (material->has_ior)
514 {
515 context->extension_flags |= CGLTF_EXTENSION_FLAG_MATERIALS_IOR;
516 }
517
518 if (material->has_specular)
519 {
520 context->extension_flags |= CGLTF_EXTENSION_FLAG_MATERIALS_SPECULAR;
521 }
522
523 if (material->has_pbr_metallic_roughness)
524 {
525 const cgltf_pbr_metallic_roughness* params = &material->pbr_metallic_roughness;
526 cgltf_write_line(context, "\"pbrMetallicRoughness\": {");
527 CGLTF_WRITE_TEXTURE_INFO("baseColorTexture", params->base_color_texture);
528 CGLTF_WRITE_TEXTURE_INFO("metallicRoughnessTexture", params->metallic_roughness_texture);
529 cgltf_write_floatprop(context, "metallicFactor", params->metallic_factor, 1.0f);
530 cgltf_write_floatprop(context, "roughnessFactor", params->roughness_factor, 1.0f);
531 if (cgltf_check_floatarray(params->base_color_factor, 4, 1.0f))
532 {
533 cgltf_write_floatarrayprop(context, "baseColorFactor", params->base_color_factor, 4);
534 }
535 cgltf_write_extras(context, &params->extras);
536 cgltf_write_line(context, "}");
537 }
538
539 if (material->unlit || material->has_pbr_specular_glossiness || material->has_clearcoat || material->has_ior || material->has_specular || material->has_transmission)
540 {
541 cgltf_write_line(context, "\"extensions\": {");
542 if (material->has_clearcoat)
543 {
544 const cgltf_clearcoat* params = &material->clearcoat;
545 cgltf_write_line(context, "\"KHR_materials_clearcoat\": {");
546 CGLTF_WRITE_TEXTURE_INFO("clearcoatTexture", params->clearcoat_texture);
547 CGLTF_WRITE_TEXTURE_INFO("clearcoatRoughnessTexture", params->clearcoat_roughness_texture);
548 CGLTF_WRITE_TEXTURE_INFO("clearcoatNormalTexture", params->clearcoat_normal_texture);
549 cgltf_write_floatprop(context, "clearcoatFactor", params->clearcoat_factor, 0.0f);
550 cgltf_write_floatprop(context, "clearcoatRoughnessFactor", params->clearcoat_roughness_factor, 0.0f);
551 cgltf_write_line(context, "}");
552 }
553 if (material->has_ior)
554 {
555 const cgltf_ior* params = &material->ior;
556 cgltf_write_line(context, "\"KHR_materials_ior\": {");
557 cgltf_write_floatprop(context, "ior", params->ior, 1.5f);
558 cgltf_write_line(context, "}");
559 }
560 if (material->has_specular)
561 {
562 const cgltf_specular* params = &material->specular;
563 cgltf_write_line(context, "\"KHR_materials_specular\": {");
564 CGLTF_WRITE_TEXTURE_INFO("specularTexture", params->specular_texture);
565 cgltf_write_floatprop(context, "specularFactor", params->specular_factor, 1.0f);
566 if (cgltf_check_floatarray(params->specular_color_factor, 3, 1.0f))
567 {
568 cgltf_write_floatarrayprop(context, "specularColorFactor", params->specular_color_factor, 3);
569 }
570 cgltf_write_line(context, "}");
571 }
572 if (material->has_transmission)
573 {
574 const cgltf_transmission* params = &material->transmission;
575 cgltf_write_line(context, "\"KHR_materials_transmission\": {");
576 CGLTF_WRITE_TEXTURE_INFO("transmissionTexture", params->transmission_texture);
577 cgltf_write_floatprop(context, "transmissionFactor", params->transmission_factor, 0.0f);
578 cgltf_write_line(context, "}");
579 }
580 if (material->has_pbr_specular_glossiness)
581 {
582 const cgltf_pbr_specular_glossiness* params = &material->pbr_specular_glossiness;
583 cgltf_write_line(context, "\"KHR_materials_pbrSpecularGlossiness\": {");
584 CGLTF_WRITE_TEXTURE_INFO("diffuseTexture", params->diffuse_texture);
585 CGLTF_WRITE_TEXTURE_INFO("specularGlossinessTexture", params->specular_glossiness_texture);
586 if (cgltf_check_floatarray(params->diffuse_factor, 4, 1.0f))
587 {
588 cgltf_write_floatarrayprop(context, "dffuseFactor", params->diffuse_factor, 4);
589 }
590 if (cgltf_check_floatarray(params->specular_factor, 3, 1.0f))
591 {
592 cgltf_write_floatarrayprop(context, "specularFactor", params->specular_factor, 3);
593 }
594 cgltf_write_floatprop(context, "glossinessFactor", params->glossiness_factor, 1.0f);
595 cgltf_write_line(context, "}");
596 }
597 if (material->unlit)
598 {
599 cgltf_write_line(context, "\"KHR_materials_unlit\": {}");
600 }
601 cgltf_write_line(context, "}");
602 }
603
604 CGLTF_WRITE_TEXTURE_INFO("normalTexture", material->normal_texture);
605 CGLTF_WRITE_TEXTURE_INFO("occlusionTexture", material->occlusion_texture);
606 CGLTF_WRITE_TEXTURE_INFO("emissiveTexture", material->emissive_texture);
607 if (cgltf_check_floatarray(material->emissive_factor, 3, 0.0f))
608 {
609 cgltf_write_floatarrayprop(context, "emissiveFactor", material->emissive_factor, 3);
610 }
611 cgltf_write_strprop(context, "alphaMode", cgltf_str_from_alpha_mode(material->alpha_mode));
612 cgltf_write_extras(context, &material->extras);
613 cgltf_write_line(context, "}");
614}
615
616static void cgltf_write_image(cgltf_write_context* context, const cgltf_image* image)
617{
618 cgltf_write_line(context, "{");
619 cgltf_write_strprop(context, "name", image->name);
620 cgltf_write_strprop(context, "uri", image->uri);
621 CGLTF_WRITE_IDXPROP("bufferView", image->buffer_view, context->data->buffer_views);
622 cgltf_write_strprop(context, "mimeType", image->mime_type);
623 cgltf_write_extras(context, &image->extras);
624 cgltf_write_line(context, "}");
625}
626
627static void cgltf_write_texture(cgltf_write_context* context, const cgltf_texture* texture)
628{
629 cgltf_write_line(context, "{");
630 cgltf_write_strprop(context, "name", texture->name);
631 CGLTF_WRITE_IDXPROP("source", texture->image, context->data->images);
632 CGLTF_WRITE_IDXPROP("sampler", texture->sampler, context->data->samplers);
633 cgltf_write_extras(context, &texture->extras);
634 cgltf_write_line(context, "}");
635}
636
637static void cgltf_write_skin(cgltf_write_context* context, const cgltf_skin* skin)
638{
639 cgltf_write_line(context, "{");
640 CGLTF_WRITE_IDXPROP("skeleton", skin->skeleton, context->data->nodes);
641 CGLTF_WRITE_IDXPROP("inverseBindMatrices", skin->inverse_bind_matrices, context->data->accessors);
642 CGLTF_WRITE_IDXARRPROP("joints", skin->joints_count, skin->joints, context->data->nodes);
643 cgltf_write_strprop(context, "name", skin->name);
644 cgltf_write_extras(context, &skin->extras);
645 cgltf_write_line(context, "}");
646}
647
648static const char* cgltf_write_str_path_type(cgltf_animation_path_type path_type)
649{
650 switch (path_type)
651 {
652 case cgltf_animation_path_type_translation:
653 return "translation";
654 case cgltf_animation_path_type_rotation:
655 return "rotation";
656 case cgltf_animation_path_type_scale:
657 return "scale";
658 case cgltf_animation_path_type_weights:
659 return "weights";
660 case cgltf_animation_path_type_invalid:
661 break;
662 }
663 return "invalid";
664}
665
666static const char* cgltf_write_str_interpolation_type(cgltf_interpolation_type interpolation_type)
667{
668 switch (interpolation_type)
669 {
670 case cgltf_interpolation_type_linear:
671 return "LINEAR";
672 case cgltf_interpolation_type_step:
673 return "STEP";
674 case cgltf_interpolation_type_cubic_spline:
675 return "CUBICSPLINE";
676 }
677 return "invalid";
678}
679
680static void cgltf_write_path_type(cgltf_write_context* context, const char *label, cgltf_animation_path_type path_type)
681{
682 cgltf_write_strprop(context, label, cgltf_write_str_path_type(path_type));
683}
684
685static void cgltf_write_interpolation_type(cgltf_write_context* context, const char *label, cgltf_interpolation_type interpolation_type)
686{
687 cgltf_write_strprop(context, label, cgltf_write_str_interpolation_type(interpolation_type));
688}
689
690static void cgltf_write_animation_sampler(cgltf_write_context* context, const cgltf_animation_sampler* animation_sampler)
691{
692 cgltf_write_line(context, "{");
693 cgltf_write_interpolation_type(context, "interpolation", animation_sampler->interpolation);
694 CGLTF_WRITE_IDXPROP("input", animation_sampler->input, context->data->accessors);
695 CGLTF_WRITE_IDXPROP("output", animation_sampler->output, context->data->accessors);
696 cgltf_write_extras(context, &animation_sampler->extras);
697 cgltf_write_line(context, "}");
698}
699
700static void cgltf_write_animation_channel(cgltf_write_context* context, const cgltf_animation* animation, const cgltf_animation_channel* animation_channel)
701{
702 cgltf_write_line(context, "{");
703 CGLTF_WRITE_IDXPROP("sampler", animation_channel->sampler, animation->samplers);
704 cgltf_write_line(context, "\"target\": {");
705 CGLTF_WRITE_IDXPROP("node", animation_channel->target_node, context->data->nodes);
706 cgltf_write_path_type(context, "path", animation_channel->target_path);
707 cgltf_write_line(context, "}");
708 cgltf_write_extras(context, &animation_channel->extras);
709 cgltf_write_line(context, "}");
710}
711
712static void cgltf_write_animation(cgltf_write_context* context, const cgltf_animation* animation)
713{
714 cgltf_write_line(context, "{");
715 cgltf_write_strprop(context, "name", animation->name);
716
717 if (animation->samplers_count > 0)
718 {
719 cgltf_write_line(context, "\"samplers\": [");
720 for (cgltf_size i = 0; i < animation->samplers_count; ++i)
721 {
722 cgltf_write_animation_sampler(context, animation->samplers + i);
723 }
724 cgltf_write_line(context, "]");
725 }
726 if (animation->channels_count > 0)
727 {
728 cgltf_write_line(context, "\"channels\": [");
729 for (cgltf_size i = 0; i < animation->channels_count; ++i)
730 {
731 cgltf_write_animation_channel(context, animation, animation->channels + i);
732 }
733 cgltf_write_line(context, "]");
734 }
735 cgltf_write_extras(context, &animation->extras);
736 cgltf_write_line(context, "}");
737}
738
739static void cgltf_write_sampler(cgltf_write_context* context, const cgltf_sampler* sampler)
740{
741 cgltf_write_line(context, "{");
742 cgltf_write_intprop(context, "magFilter", sampler->mag_filter, 0);
743 cgltf_write_intprop(context, "minFilter", sampler->min_filter, 0);
744 cgltf_write_intprop(context, "wrapS", sampler->wrap_s, 10497);
745 cgltf_write_intprop(context, "wrapT", sampler->wrap_t, 10497);
746 cgltf_write_extras(context, &sampler->extras);
747 cgltf_write_line(context, "}");
748}
749
750static void cgltf_write_node(cgltf_write_context* context, const cgltf_node* node)
751{
752 cgltf_write_line(context, "{");
753 CGLTF_WRITE_IDXARRPROP("children", node->children_count, node->children, context->data->nodes);
754 CGLTF_WRITE_IDXPROP("mesh", node->mesh, context->data->meshes);
755 cgltf_write_strprop(context, "name", node->name);
756 if (node->has_matrix)
757 {
758 cgltf_write_floatarrayprop(context, "matrix", node->matrix, 16);
759 }
760 if (node->has_translation)
761 {
762 cgltf_write_floatarrayprop(context, "translation", node->translation, 3);
763 }
764 if (node->has_rotation)
765 {
766 cgltf_write_floatarrayprop(context, "rotation", node->rotation, 4);
767 }
768 if (node->has_scale)
769 {
770 cgltf_write_floatarrayprop(context, "scale", node->scale, 3);
771 }
772 if (node->skin)
773 {
774 CGLTF_WRITE_IDXPROP("skin", node->skin, context->data->skins);
775 }
776
777 if (node->light)
778 {
779 context->extension_flags |= CGLTF_EXTENSION_FLAG_LIGHTS_PUNCTUAL;
780 cgltf_write_line(context, "\"extensions\": {");
781 cgltf_write_line(context, "\"KHR_lights_punctual\": {");
782 CGLTF_WRITE_IDXPROP("light", node->light, context->data->lights);
783 cgltf_write_line(context, "}");
784 cgltf_write_line(context, "}");
785 }
786
787 if (node->weights_count > 0)
788 {
789 cgltf_write_floatarrayprop(context, "weights", node->weights, node->weights_count);
790 }
791
792 if (node->camera)
793 {
794 CGLTF_WRITE_IDXPROP("camera", node->camera, context->data->cameras);
795 }
796
797 cgltf_write_extras(context, &node->extras);
798 cgltf_write_line(context, "}");
799}
800
801static void cgltf_write_scene(cgltf_write_context* context, const cgltf_scene* scene)
802{
803 cgltf_write_line(context, "{");
804 cgltf_write_strprop(context, "name", scene->name);
805 CGLTF_WRITE_IDXARRPROP("nodes", scene->nodes_count, scene->nodes, context->data->nodes);
806 cgltf_write_extras(context, &scene->extras);
807 cgltf_write_line(context, "}");
808}
809
810static void cgltf_write_accessor(cgltf_write_context* context, const cgltf_accessor* accessor)
811{
812 cgltf_write_line(context, "{");
813 CGLTF_WRITE_IDXPROP("bufferView", accessor->buffer_view, context->data->buffer_views);
814 cgltf_write_intprop(context, "componentType", cgltf_int_from_component_type(accessor->component_type), 0);
815 cgltf_write_strprop(context, "type", cgltf_str_from_type(accessor->type));
816 cgltf_size dim = cgltf_dim_from_type(accessor->type);
817 cgltf_write_boolprop_optional(context, "normalized", accessor->normalized, false);
818 cgltf_write_intprop(context, "byteOffset", (int)accessor->offset, 0);
819 cgltf_write_intprop(context, "count", (int)accessor->count, -1);
820 if (accessor->has_min)
821 {
822 cgltf_write_floatarrayprop(context, "min", accessor->min, dim);
823 }
824 if (accessor->has_max)
825 {
826 cgltf_write_floatarrayprop(context, "max", accessor->max, dim);
827 }
828 if (accessor->is_sparse)
829 {
830 cgltf_write_line(context, "\"sparse\": {");
831 cgltf_write_intprop(context, "count", (int)accessor->sparse.count, 0);
832 cgltf_write_line(context, "\"indices\": {");
833 cgltf_write_intprop(context, "byteOffset", (int)accessor->sparse.indices_byte_offset, 0);
834 CGLTF_WRITE_IDXPROP("bufferView", accessor->sparse.indices_buffer_view, context->data->buffer_views);
835 cgltf_write_intprop(context, "componentType", cgltf_int_from_component_type(accessor->sparse.indices_component_type), 0);
836 cgltf_write_extras(context, &accessor->sparse.indices_extras);
837 cgltf_write_line(context, "}");
838 cgltf_write_line(context, "\"values\": {");
839 cgltf_write_intprop(context, "byteOffset", (int)accessor->sparse.values_byte_offset, 0);
840 CGLTF_WRITE_IDXPROP("bufferView", accessor->sparse.values_buffer_view, context->data->buffer_views);
841 cgltf_write_extras(context, &accessor->sparse.values_extras);
842 cgltf_write_line(context, "}");
843 cgltf_write_extras(context, &accessor->sparse.extras);
844 cgltf_write_line(context, "}");
845 }
846 cgltf_write_extras(context, &accessor->extras);
847 cgltf_write_line(context, "}");
848}
849
850static void cgltf_write_camera(cgltf_write_context* context, const cgltf_camera* camera)
851{
852 cgltf_write_line(context, "{");
853 cgltf_write_strprop(context, "type", cgltf_str_from_camera_type(camera->type));
854 if (camera->name)
855 {
856 cgltf_write_strprop(context, "name", camera->name);
857 }
858
859 if (camera->type == cgltf_camera_type_orthographic)
860 {
861 cgltf_write_line(context, "\"orthographic\": {");
862 cgltf_write_floatprop(context, "xmag", camera->data.orthographic.xmag, -1.0f);
863 cgltf_write_floatprop(context, "ymag", camera->data.orthographic.ymag, -1.0f);
864 cgltf_write_floatprop(context, "zfar", camera->data.orthographic.zfar, -1.0f);
865 cgltf_write_floatprop(context, "znear", camera->data.orthographic.znear, -1.0f);
866 cgltf_write_extras(context, &camera->data.orthographic.extras);
867 cgltf_write_line(context, "}");
868 }
869 else if (camera->type == cgltf_camera_type_perspective)
870 {
871 cgltf_write_line(context, "\"perspective\": {");
872 cgltf_write_floatprop(context, "aspectRatio", camera->data.perspective.aspect_ratio, -1.0f);
873 cgltf_write_floatprop(context, "yfov", camera->data.perspective.yfov, -1.0f);
874 cgltf_write_floatprop(context, "zfar", camera->data.perspective.zfar, -1.0f);
875 cgltf_write_floatprop(context, "znear", camera->data.perspective.znear, -1.0f);
876 cgltf_write_extras(context, &camera->data.perspective.extras);
877 cgltf_write_line(context, "}");
878 }
879 cgltf_write_extras(context, &camera->extras);
880 cgltf_write_line(context, "}");
881}
882
883static void cgltf_write_light(cgltf_write_context* context, const cgltf_light* light)
884{
885 cgltf_write_line(context, "{");
886 cgltf_write_strprop(context, "type", cgltf_str_from_light_type(light->type));
887 if (light->name)
888 {
889 cgltf_write_strprop(context, "name", light->name);
890 }
891 if (cgltf_check_floatarray(light->color, 3, 1.0f))
892 {
893 cgltf_write_floatarrayprop(context, "color", light->color, 3);
894 }
895 cgltf_write_floatprop(context, "intensity", light->intensity, 1.0f);
896 cgltf_write_floatprop(context, "range", light->range, 0.0f);
897
898 if (light->type == cgltf_light_type_spot)
899 {
900 cgltf_write_line(context, "\"spot\": {");
901 cgltf_write_floatprop(context, "innerConeAngle", light->spot_inner_cone_angle, 0.0f);
902 cgltf_write_floatprop(context, "outerConeAngle", light->spot_outer_cone_angle, 3.14159265358979323846f/4.0f);
903 cgltf_write_line(context, "}");
904 }
905 cgltf_write_line(context, "}");
906}
907
908cgltf_result cgltf_write_file(const cgltf_options* options, const char* path, const cgltf_data* data)
909{
910 cgltf_size expected = cgltf_write(options, NULL, 0, data);
911 char* buffer = (char*) malloc(expected);
912 cgltf_size actual = cgltf_write(options, buffer, expected, data);
913 if (expected != actual) {
914 fprintf(stderr, "Error: expected %zu bytes but wrote %zu bytes.\n", expected, actual);
915 }
916 FILE* file = fopen(path, "wt");
917 if (!file)
918 {
919 return cgltf_result_file_not_found;
920 }
921 // Note that cgltf_write() includes a null terminator, which we omit from the file content.
922 fwrite(buffer, actual - 1, 1, file);
923 fclose(file);
924 free(buffer);
925 return cgltf_result_success;
926}
927
928static void cgltf_write_extensions(cgltf_write_context* context, uint32_t extension_flags)
929{
930 if (extension_flags & CGLTF_EXTENSION_FLAG_TEXTURE_TRANSFORM) {
931 cgltf_write_stritem(context, "KHR_texture_transform");
932 }
933 if (extension_flags & CGLTF_EXTENSION_FLAG_MATERIALS_UNLIT) {
934 cgltf_write_stritem(context, "KHR_materials_unlit");
935 }
936 if (extension_flags & CGLTF_EXTENSION_FLAG_SPECULAR_GLOSSINESS) {
937 cgltf_write_stritem(context, "KHR_materials_pbrSpecularGlossiness");
938 }
939 if (extension_flags & CGLTF_EXTENSION_FLAG_LIGHTS_PUNCTUAL) {
940 cgltf_write_stritem(context, "KHR_lights_punctual");
941 }
942 if (extension_flags & CGLTF_EXTENSION_FLAG_DRACO_MESH_COMPRESSION) {
943 cgltf_write_stritem(context, "KHR_draco_mesh_compression");
944 }
945 if (extension_flags & CGLTF_EXTENSION_FLAG_MATERIALS_CLEARCOAT) {
946 cgltf_write_stritem(context, "KHR_materials_clearcoat");
947 }
948 if (extension_flags & CGLTF_EXTENSION_FLAG_MATERIALS_IOR) {
949 cgltf_write_stritem(context, "KHR_materials_ior");
950 }
951 if (extension_flags & CGLTF_EXTENSION_FLAG_MATERIALS_SPECULAR) {
952 cgltf_write_stritem(context, "KHR_materials_specular");
953 }
954 if (extension_flags & CGLTF_EXTENSION_FLAG_MATERIALS_TRANSMISSION) {
955 cgltf_write_stritem(context, "KHR_materials_transmission");
956 }
957}
958
959cgltf_size cgltf_write(const cgltf_options* options, char* buffer, cgltf_size size, const cgltf_data* data)
960{
961 (void)options;
962 cgltf_write_context ctx;
963 ctx.buffer = buffer;
964 ctx.buffer_size = size;
965 ctx.remaining = size;
966 ctx.cursor = buffer;
967 ctx.chars_written = 0;
968 ctx.data = data;
969 ctx.depth = 1;
970 ctx.indent = " ";
971 ctx.needs_comma = 0;
972 ctx.extension_flags = 0;
973 ctx.required_extension_flags = 0;
974
975 cgltf_write_context* context = &ctx;
976
977 CGLTF_SPRINTF("{");
978
979 if (data->accessors_count > 0)
980 {
981 cgltf_write_line(context, "\"accessors\": [");
982 for (cgltf_size i = 0; i < data->accessors_count; ++i)
983 {
984 cgltf_write_accessor(context, data->accessors + i);
985 }
986 cgltf_write_line(context, "]");
987 }
988
989 cgltf_write_asset(context, &data->asset);
990
991 if (data->buffer_views_count > 0)
992 {
993 cgltf_write_line(context, "\"bufferViews\": [");
994 for (cgltf_size i = 0; i < data->buffer_views_count; ++i)
995 {
996 cgltf_write_buffer_view(context, data->buffer_views + i);
997 }
998 cgltf_write_line(context, "]");
999 }
1000
1001 if (data->buffers_count > 0)
1002 {
1003 cgltf_write_line(context, "\"buffers\": [");
1004 for (cgltf_size i = 0; i < data->buffers_count; ++i)
1005 {
1006 cgltf_write_buffer(context, data->buffers + i);
1007 }
1008 cgltf_write_line(context, "]");
1009 }
1010
1011 if (data->images_count > 0)
1012 {
1013 cgltf_write_line(context, "\"images\": [");
1014 for (cgltf_size i = 0; i < data->images_count; ++i)
1015 {
1016 cgltf_write_image(context, data->images + i);
1017 }
1018 cgltf_write_line(context, "]");
1019 }
1020
1021 if (data->meshes_count > 0)
1022 {
1023 cgltf_write_line(context, "\"meshes\": [");
1024 for (cgltf_size i = 0; i < data->meshes_count; ++i)
1025 {
1026 cgltf_write_mesh(context, data->meshes + i);
1027 }
1028 cgltf_write_line(context, "]");
1029 }
1030
1031 if (data->materials_count > 0)
1032 {
1033 cgltf_write_line(context, "\"materials\": [");
1034 for (cgltf_size i = 0; i < data->materials_count; ++i)
1035 {
1036 cgltf_write_material(context, data->materials + i);
1037 }
1038 cgltf_write_line(context, "]");
1039 }
1040
1041 if (data->nodes_count > 0)
1042 {
1043 cgltf_write_line(context, "\"nodes\": [");
1044 for (cgltf_size i = 0; i < data->nodes_count; ++i)
1045 {
1046 cgltf_write_node(context, data->nodes + i);
1047 }
1048 cgltf_write_line(context, "]");
1049 }
1050
1051 if (data->samplers_count > 0)
1052 {
1053 cgltf_write_line(context, "\"samplers\": [");
1054 for (cgltf_size i = 0; i < data->samplers_count; ++i)
1055 {
1056 cgltf_write_sampler(context, data->samplers + i);
1057 }
1058 cgltf_write_line(context, "]");
1059 }
1060
1061 CGLTF_WRITE_IDXPROP("scene", data->scene, data->scenes);
1062
1063 if (data->scenes_count > 0)
1064 {
1065 cgltf_write_line(context, "\"scenes\": [");
1066 for (cgltf_size i = 0; i < data->scenes_count; ++i)
1067 {
1068 cgltf_write_scene(context, data->scenes + i);
1069 }
1070 cgltf_write_line(context, "]");
1071 }
1072
1073 if (data->textures_count > 0)
1074 {
1075 cgltf_write_line(context, "\"textures\": [");
1076 for (cgltf_size i = 0; i < data->textures_count; ++i)
1077 {
1078 cgltf_write_texture(context, data->textures + i);
1079 }
1080 cgltf_write_line(context, "]");
1081 }
1082
1083 if (data->skins_count > 0)
1084 {
1085 cgltf_write_line(context, "\"skins\": [");
1086 for (cgltf_size i = 0; i < data->skins_count; ++i)
1087 {
1088 cgltf_write_skin(context, data->skins + i);
1089 }
1090 cgltf_write_line(context, "]");
1091 }
1092
1093 if (data->animations_count > 0)
1094 {
1095 cgltf_write_line(context, "\"animations\": [");
1096 for (cgltf_size i = 0; i < data->animations_count; ++i)
1097 {
1098 cgltf_write_animation(context, data->animations + i);
1099 }
1100 cgltf_write_line(context, "]");
1101 }
1102
1103 if (data->cameras_count > 0)
1104 {
1105 cgltf_write_line(context, "\"cameras\": [");
1106 for (cgltf_size i = 0; i < data->cameras_count; ++i)
1107 {
1108 cgltf_write_camera(context, data->cameras + i);
1109 }
1110 cgltf_write_line(context, "]");
1111 }
1112
1113 if (data->lights_count > 0)
1114 {
1115 cgltf_write_line(context, "\"extensions\": {");
1116
1117 cgltf_write_line(context, "\"KHR_lights_punctual\": {");
1118 cgltf_write_line(context, "\"lights\": [");
1119 for (cgltf_size i = 0; i < data->lights_count; ++i)
1120 {
1121 cgltf_write_light(context, data->lights + i);
1122 }
1123 cgltf_write_line(context, "]");
1124 cgltf_write_line(context, "}");
1125
1126 cgltf_write_line(context, "}");
1127 }
1128
1129 if (context->extension_flags != 0) {
1130 cgltf_write_line(context, "\"extensionsUsed\": [");
1131 cgltf_write_extensions(context, context->extension_flags);
1132 cgltf_write_line(context, "]");
1133 }
1134
1135 if (context->required_extension_flags != 0) {
1136 cgltf_write_line(context, "\"extensionsRequired\": [");
1137 cgltf_write_extensions(context, context->required_extension_flags);
1138 cgltf_write_line(context, "]");
1139 }
1140
1141 cgltf_write_extras(context, &data->extras);
1142
1143 CGLTF_SPRINTF("\n}\n");
1144
1145 // snprintf does not include the null terminator in its return value, so be sure to include it
1146 // in the returned byte count.
1147 return 1 + ctx.chars_written;
1148}
1149
1150#endif /* #ifdef CGLTF_WRITE_IMPLEMENTATION */
1151
1152/* cgltf is distributed under MIT license:
1153 *
1154 * Copyright (c) 2019 Philip Rideout
1155
1156 * Permission is hereby granted, free of charge, to any person obtaining a copy
1157 * of this software and associated documentation files (the "Software"), to deal
1158 * in the Software without restriction, including without limitation the rights
1159 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
1160 * copies of the Software, and to permit persons to whom the Software is
1161 * furnished to do so, subject to the following conditions:
1162
1163 * The above copyright notice and this permission notice shall be included in all
1164 * copies or substantial portions of the Software.
1165
1166 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
1167 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
1168 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
1169 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
1170 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
1171 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
1172 * SOFTWARE.
1173 */
generated by cgit v1.2.3 (git 2.25.1) at 2026-03-07 05:26:27 +0000