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diff --git a/3rdparty/bgfx/3rdparty/cgltf/cgltf_write.h b/3rdparty/bgfx/3rdparty/cgltf/cgltf_write.h
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+++ b/3rdparty/bgfx/3rdparty/cgltf/cgltf_write.h
@@ -0,0 +1,1488 @@
+/**
+ * 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.
+ */
+#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); \
+ 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, "}"); }
+
+#define CGLTF_WRITE_NORMAL_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, "}"); }
+
+#define CGLTF_WRITE_OCCLUSION_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, "strength", 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)
+{
+ if (extras->data)
+ {
+ cgltf_write_indent(context);
+ CGLTF_SPRINTF("\"extras\": %s", extras->data);
+ context->needs_comma = 1;
+ }
+ else
+ {
+ 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_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_NORMAL_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_NORMAL_TEXTURE_INFO("normalTexture", material->normal_texture);
+ CGLTF_WRITE_OCCLUSION_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));
+ cgltf_size dim = cgltf_dim_from_type(accessor->type);
+ cgltf_write_boolprop_optional(context, "normalized", (bool)accessor->normalized, false);
+ cgltf_write_sizeprop(context, "byteOffset", (int)accessor->offset, 0);
+ cgltf_write_intprop(context, "count", (int)accessor->count, -1);
+ if (accessor->has_min)
+ {
+ cgltf_write_floatarrayprop(context, "min", accessor->min, dim);
+ }
+ if (accessor->has_max)
+ {
+ cgltf_write_floatarrayprop(context, "max", accessor->max, dim);
+ }
+ if (accessor->is_sparse)
+ {
+ cgltf_write_line(context, "\"sparse\": {");
+ cgltf_write_intprop(context, "count", (int)accessor->sparse.count, 0);
+ cgltf_write_line(context, "\"indices\": {");
+ cgltf_write_sizeprop(context, "byteOffset", (int)accessor->sparse.indices_byte_offset, 0);
+ CGLTF_WRITE_IDXPROP("bufferView", accessor->sparse.indices_buffer_view, context->data->buffer_views);
+ cgltf_write_intprop(context, "componentType", cgltf_int_from_component_type(accessor->sparse.indices_component_type), 0);
+ cgltf_write_extras(context, &accessor->sparse.indices_extras);
+ cgltf_write_line(context, "}");
+ cgltf_write_line(context, "\"values\": {");
+ cgltf_write_sizeprop(context, "byteOffset", (int)accessor->sparse.values_byte_offset, 0);
+ CGLTF_WRITE_IDXPROP("bufferView", accessor->sparse.values_buffer_view, context->data->buffer_views);
+ cgltf_write_extras(context, &accessor->sparse.values_extras);
+ cgltf_write_line(context, "}");
+ cgltf_write_extras(context, &accessor->sparse.extras);
+ cgltf_write_line(context, "}");
+ }
+ cgltf_write_extras(context, &accessor->extras);
+ cgltf_write_line(context, "}");
+}
+
+static void cgltf_write_camera(cgltf_write_context* context, const cgltf_camera* camera)
+{
+ cgltf_write_line(context, "{");
+ cgltf_write_strprop(context, "type", cgltf_str_from_camera_type(camera->type));
+ if (camera->name)
+ {
+ cgltf_write_strprop(context, "name", camera->name);
+ }
+
+ if (camera->type == cgltf_camera_type_orthographic)
+ {
+ cgltf_write_line(context, "\"orthographic\": {");
+ cgltf_write_floatprop(context, "xmag", camera->data.orthographic.xmag, -1.0f);
+ cgltf_write_floatprop(context, "ymag", camera->data.orthographic.ymag, -1.0f);
+ cgltf_write_floatprop(context, "zfar", camera->data.orthographic.zfar, -1.0f);
+ cgltf_write_floatprop(context, "znear", camera->data.orthographic.znear, -1.0f);
+ cgltf_write_extras(context, &camera->data.orthographic.extras);
+ cgltf_write_line(context, "}");
+ }
+ else if (camera->type == cgltf_camera_type_perspective)
+ {
+ cgltf_write_line(context, "\"perspective\": {");
+
+ if (camera->data.perspective.has_aspect_ratio) {
+ cgltf_write_floatprop(context, "aspectRatio", camera->data.perspective.aspect_ratio, -1.0f);
+ }
+
+ cgltf_write_floatprop(context, "yfov", camera->data.perspective.yfov, -1.0f);
+
+ if (camera->data.perspective.has_zfar) {
+ cgltf_write_floatprop(context, "zfar", camera->data.perspective.zfar, -1.0f);
+ }
+
+ cgltf_write_floatprop(context, "znear", camera->data.perspective.znear, -1.0f);
+ cgltf_write_extras(context, &camera->data.perspective.extras);
+ cgltf_write_line(context, "}");
+ }
+ cgltf_write_extras(context, &camera->extras);
+ cgltf_write_line(context, "}");
+}
+
+static void cgltf_write_light(cgltf_write_context* context, const cgltf_light* light)
+{
+ context->extension_flags |= CGLTF_EXTENSION_FLAG_LIGHTS_PUNCTUAL;
+
+ cgltf_write_line(context, "{");
+ cgltf_write_strprop(context, "type", cgltf_str_from_light_type(light->type));
+ if (light->name)
+ {
+ cgltf_write_strprop(context, "name", light->name);
+ }
+ if (cgltf_check_floatarray(light->color, 3, 1.0f))
+ {
+ cgltf_write_floatarrayprop(context, "color", light->color, 3);
+ }
+ cgltf_write_floatprop(context, "intensity", light->intensity, 1.0f);
+ cgltf_write_floatprop(context, "range", light->range, 0.0f);
+
+ if (light->type == cgltf_light_type_spot)
+ {
+ cgltf_write_line(context, "\"spot\": {");
+ cgltf_write_floatprop(context, "innerConeAngle", light->spot_inner_cone_angle, 0.0f);
+ cgltf_write_floatprop(context, "outerConeAngle", light->spot_outer_cone_angle, 3.14159265358979323846f/4.0f);
+ cgltf_write_line(context, "}");
+ }
+ cgltf_write_line(context, "}");
+}
+
+static void cgltf_write_variant(cgltf_write_context* context, const cgltf_material_variant* variant)
+{
+ context->extension_flags |= CGLTF_EXTENSION_FLAG_MATERIALS_VARIANTS;
+
+ cgltf_write_line(context, "{");
+ cgltf_write_strprop(context, "name", variant->name);
+ cgltf_write_extras(context, &variant->extras);
+ cgltf_write_line(context, "}");
+}
+
+static void cgltf_write_glb(FILE* file, const void* json_buf, const cgltf_size json_size, const void* bin_buf, const cgltf_size bin_size)
+{
+ char header[GlbHeaderSize];
+ char chunk_header[GlbChunkHeaderSize];
+ char json_pad[3] = { 0x20, 0x20, 0x20 };
+ char bin_pad[3] = { 0, 0, 0 };
+
+ cgltf_size json_padsize = (json_size % 4 != 0) ? 4 - json_size % 4 : 0;
+ cgltf_size bin_padsize = (bin_size % 4 != 0) ? 4 - bin_size % 4 : 0;
+ cgltf_size total_size = GlbHeaderSize + GlbChunkHeaderSize + json_size + json_padsize;
+ if (bin_buf != NULL && bin_size > 0) {
+ total_size += GlbChunkHeaderSize + bin_size + bin_padsize;
+ }
+
+ // Write a GLB header
+ memcpy(header, &GlbMagic, 4);
+ memcpy(header + 4, &GlbVersion, 4);
+ memcpy(header + 8, &total_size, 4);
+ fwrite(header, 1, GlbHeaderSize, file);
+
+ // Write a JSON chunk (header & data)
+ uint32_t json_chunk_size = (uint32_t)(json_size + json_padsize);
+ memcpy(chunk_header, &json_chunk_size, 4);
+ memcpy(chunk_header + 4, &GlbMagicJsonChunk, 4);
+ fwrite(chunk_header, 1, GlbChunkHeaderSize, file);
+
+ fwrite(json_buf, 1, json_size, file);
+ fwrite(json_pad, 1, json_padsize, file);
+
+ if (bin_buf != NULL && bin_size > 0) {
+ // Write a binary chunk (header & data)
+ uint32_t bin_chunk_size = (uint32_t)(bin_size + bin_padsize);
+ memcpy(chunk_header, &bin_chunk_size, 4);
+ memcpy(chunk_header + 4, &GlbMagicBinChunk, 4);
+ fwrite(chunk_header, 1, GlbChunkHeaderSize, file);
+
+ fwrite(bin_buf, 1, bin_size, file);
+ fwrite(bin_pad, 1, bin_padsize, file);
+ }
+}
+
+cgltf_result cgltf_write_file(const cgltf_options* options, const char* path, const cgltf_data* data)
+{
+ cgltf_size expected = cgltf_write(options, NULL, 0, data);
+ char* buffer = (char*) malloc(expected);
+ cgltf_size actual = cgltf_write(options, buffer, expected, data);
+ if (expected != actual) {
+ fprintf(stderr, "Error: expected %zu bytes but wrote %zu bytes.\n", expected, actual);
+ }
+ FILE* file = fopen(path, "wb");
+ if (!file)
+ {
+ return cgltf_result_file_not_found;
+ }
+ // Note that cgltf_write() includes a null terminator, which we omit from the file content.
+ if (options->type == cgltf_file_type_glb) {
+ cgltf_write_glb(file, buffer, actual - 1, data->bin, data->bin_size);
+ } else {
+ // Write a plain JSON file.
+ fwrite(buffer, actual - 1, 1, file);
+ }
+ fclose(file);
+ free(buffer);
+ return cgltf_result_success;
+}
+
+static void cgltf_write_extensions(cgltf_write_context* context, uint32_t extension_flags)
+{
+ if (extension_flags & CGLTF_EXTENSION_FLAG_TEXTURE_TRANSFORM) {
+ cgltf_write_stritem(context, "KHR_texture_transform");
+ }
+ if (extension_flags & CGLTF_EXTENSION_FLAG_MATERIALS_UNLIT) {
+ cgltf_write_stritem(context, "KHR_materials_unlit");
+ }
+ if (extension_flags & CGLTF_EXTENSION_FLAG_SPECULAR_GLOSSINESS) {
+ cgltf_write_stritem(context, "KHR_materials_pbrSpecularGlossiness");
+ }
+ if (extension_flags & CGLTF_EXTENSION_FLAG_LIGHTS_PUNCTUAL) {
+ cgltf_write_stritem(context, "KHR_lights_punctual");
+ }
+ if (extension_flags & CGLTF_EXTENSION_FLAG_DRACO_MESH_COMPRESSION) {
+ cgltf_write_stritem(context, "KHR_draco_mesh_compression");
+ }
+ if (extension_flags & CGLTF_EXTENSION_FLAG_MATERIALS_CLEARCOAT) {
+ cgltf_write_stritem(context, "KHR_materials_clearcoat");
+ }
+ if (extension_flags & CGLTF_EXTENSION_FLAG_MATERIALS_IOR) {
+ cgltf_write_stritem(context, "KHR_materials_ior");
+ }
+ if (extension_flags & CGLTF_EXTENSION_FLAG_MATERIALS_SPECULAR) {
+ cgltf_write_stritem(context, "KHR_materials_specular");
+ }
+ if (extension_flags & CGLTF_EXTENSION_FLAG_MATERIALS_TRANSMISSION) {
+ cgltf_write_stritem(context, "KHR_materials_transmission");
+ }
+ if (extension_flags & CGLTF_EXTENSION_FLAG_MATERIALS_SHEEN) {
+ cgltf_write_stritem(context, "KHR_materials_sheen");
+ }
+ if (extension_flags & CGLTF_EXTENSION_FLAG_MATERIALS_VARIANTS) {
+ cgltf_write_stritem(context, "KHR_materials_variants");
+ }
+ if (extension_flags & CGLTF_EXTENSION_FLAG_MATERIALS_VOLUME) {
+ cgltf_write_stritem(context, "KHR_materials_volume");
+ }
+ if (extension_flags & CGLTF_EXTENSION_FLAG_TEXTURE_BASISU) {
+ cgltf_write_stritem(context, "KHR_texture_basisu");
+ }
+ if (extension_flags & CGLTF_EXTENSION_FLAG_MATERIALS_EMISSIVE_STRENGTH) {
+ cgltf_write_stritem(context, "KHR_materials_emissive_strength");
+ }
+ if (extension_flags & CGLTF_EXTENSION_FLAG_MATERIALS_IRIDESCENCE) {
+ cgltf_write_stritem(context, "KHR_materials_iridescence");
+ }
+ if (extension_flags & CGLTF_EXTENSION_FLAG_MESH_GPU_INSTANCING) {
+ cgltf_write_stritem(context, "EXT_mesh_gpu_instancing");
+ }
+}
+
+cgltf_size cgltf_write(const cgltf_options* options, char* buffer, cgltf_size size, const cgltf_data* data)
+{
+ (void)options;
+ cgltf_write_context ctx;
+ ctx.buffer = buffer;
+ ctx.buffer_size = size;
+ ctx.remaining = size;
+ ctx.cursor = buffer;
+ ctx.chars_written = 0;
+ ctx.data = data;
+ ctx.depth = 1;
+ ctx.indent = " ";
+ ctx.needs_comma = 0;
+ ctx.extension_flags = 0;
+ ctx.required_extension_flags = 0;
+
+ cgltf_write_context* context = &ctx;
+
+ CGLTF_SPRINTF("{");
+
+ if (data->accessors_count > 0)
+ {
+ cgltf_write_line(context, "\"accessors\": [");
+ for (cgltf_size i = 0; i < data->accessors_count; ++i)
+ {
+ cgltf_write_accessor(context, data->accessors + i);
+ }
+ cgltf_write_line(context, "]");
+ }
+
+ cgltf_write_asset(context, &data->asset);
+
+ if (data->buffer_views_count > 0)
+ {
+ cgltf_write_line(context, "\"bufferViews\": [");
+ for (cgltf_size i = 0; i < data->buffer_views_count; ++i)
+ {
+ cgltf_write_buffer_view(context, data->buffer_views + i);
+ }
+ cgltf_write_line(context, "]");
+ }
+
+ if (data->buffers_count > 0)
+ {
+ cgltf_write_line(context, "\"buffers\": [");
+ for (cgltf_size i = 0; i < data->buffers_count; ++i)
+ {
+ cgltf_write_buffer(context, data->buffers + i);
+ }
+ cgltf_write_line(context, "]");
+ }
+
+ if (data->images_count > 0)
+ {
+ cgltf_write_line(context, "\"images\": [");
+ for (cgltf_size i = 0; i < data->images_count; ++i)
+ {
+ cgltf_write_image(context, data->images + i);
+ }
+ cgltf_write_line(context, "]");
+ }
+
+ if (data->meshes_count > 0)
+ {
+ cgltf_write_line(context, "\"meshes\": [");
+ for (cgltf_size i = 0; i < data->meshes_count; ++i)
+ {
+ cgltf_write_mesh(context, data->meshes + i);
+ }
+ cgltf_write_line(context, "]");
+ }
+
+ if (data->materials_count > 0)
+ {
+ cgltf_write_line(context, "\"materials\": [");
+ for (cgltf_size i = 0; i < data->materials_count; ++i)
+ {
+ cgltf_write_material(context, data->materials + i);
+ }
+ cgltf_write_line(context, "]");
+ }
+
+ if (data->nodes_count > 0)
+ {
+ cgltf_write_line(context, "\"nodes\": [");
+ for (cgltf_size i = 0; i < data->nodes_count; ++i)
+ {
+ cgltf_write_node(context, data->nodes + i);
+ }
+ cgltf_write_line(context, "]");
+ }
+
+ if (data->samplers_count > 0)
+ {
+ cgltf_write_line(context, "\"samplers\": [");
+ for (cgltf_size i = 0; i < data->samplers_count; ++i)
+ {
+ cgltf_write_sampler(context, data->samplers + i);
+ }
+ cgltf_write_line(context, "]");
+ }
+
+ CGLTF_WRITE_IDXPROP("scene", data->scene, data->scenes);
+
+ if (data->scenes_count > 0)
+ {
+ cgltf_write_line(context, "\"scenes\": [");
+ for (cgltf_size i = 0; i < data->scenes_count; ++i)
+ {
+ cgltf_write_scene(context, data->scenes + i);
+ }
+ cgltf_write_line(context, "]");
+ }
+
+ if (data->textures_count > 0)
+ {
+ cgltf_write_line(context, "\"textures\": [");
+ for (cgltf_size i = 0; i < data->textures_count; ++i)
+ {
+ cgltf_write_texture(context, data->textures + i);
+ }
+ cgltf_write_line(context, "]");
+ }
+
+ if (data->skins_count > 0)
+ {
+ cgltf_write_line(context, "\"skins\": [");
+ for (cgltf_size i = 0; i < data->skins_count; ++i)
+ {
+ cgltf_write_skin(context, data->skins + i);
+ }
+ cgltf_write_line(context, "]");
+ }
+
+ if (data->animations_count > 0)
+ {
+ cgltf_write_line(context, "\"animations\": [");
+ for (cgltf_size i = 0; i < data->animations_count; ++i)
+ {
+ cgltf_write_animation(context, data->animations + i);
+ }
+ cgltf_write_line(context, "]");
+ }
+
+ if (data->cameras_count > 0)
+ {
+ cgltf_write_line(context, "\"cameras\": [");
+ for (cgltf_size i = 0; i < data->cameras_count; ++i)
+ {
+ cgltf_write_camera(context, data->cameras + i);
+ }
+ cgltf_write_line(context, "]");
+ }
+
+ if (data->lights_count > 0 || data->variants_count > 0)
+ {
+ cgltf_write_line(context, "\"extensions\": {");
+
+ if (data->lights_count > 0)
+ {
+ cgltf_write_line(context, "\"KHR_lights_punctual\": {");
+ cgltf_write_line(context, "\"lights\": [");
+ for (cgltf_size i = 0; i < data->lights_count; ++i)
+ {
+ cgltf_write_light(context, data->lights + i);
+ }
+ cgltf_write_line(context, "]");
+ cgltf_write_line(context, "}");
+ }
+
+ if (data->variants_count)
+ {
+ cgltf_write_line(context, "\"KHR_materials_variants\": {");
+ cgltf_write_line(context, "\"variants\": [");
+ for (cgltf_size i = 0; i < data->variants_count; ++i)
+ {
+ cgltf_write_variant(context, data->variants + i);
+ }
+ cgltf_write_line(context, "]");
+ cgltf_write_line(context, "}");
+ }
+
+ cgltf_write_line(context, "}");
+ }
+
+ if (context->extension_flags != 0)
+ {
+ cgltf_write_line(context, "\"extensionsUsed\": [");
+ cgltf_write_extensions(context, context->extension_flags);
+ cgltf_write_line(context, "]");
+ }
+
+ if (context->required_extension_flags != 0)
+ {
+ cgltf_write_line(context, "\"extensionsRequired\": [");
+ cgltf_write_extensions(context, context->required_extension_flags);
+ cgltf_write_line(context, "]");
+ }
+
+ cgltf_write_extras(context, &data->extras);
+
+ CGLTF_SPRINTF("\n}\n");
+
+ // snprintf does not include the null terminator in its return value, so be sure to include it
+ // in the returned byte count.
+ return 1 + ctx.chars_written;
+}
+
+#endif /* #ifdef CGLTF_WRITE_IMPLEMENTATION */
+
+/* cgltf is distributed under MIT license:
+ *
+ * Copyright (c) 2019-2021 Philip Rideout
+
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */