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Update cgltf.h

pull/3901/head
Ray 8 months ago
parent
1b14c082ed
commit
aca9ab0ebb
1 changed files with 168 additions and 62 deletions
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  1. +168
    -62
      src/external/cgltf.h

+ 168
- 62
src/external/cgltf.h View File

@ -63,9 +63,14 @@
* By passing null for the output pointer, users can find out how many floats are required in the
* output buffer.
*
* `cgltf_accessor_unpack_indices` reads in the index data from an accessor. Assumes that
* `cgltf_load_buffers` has already been called. By passing null for the output pointer, users can
* find out how many indices are required in the output buffer. Returns 0 if the accessor is
* sparse or if the output component size is less than the accessor's component size.
*
* `cgltf_num_components` is a tiny utility that tells you the dimensionality of
* a certain accessor type. This can be used before `cgltf_accessor_unpack_floats` to help allocate
* the necessary amount of memory. `cgltf_component_size` and `cgltf_calc_size` exist for
* the necessary amount of memory. `cgltf_component_size` and `cgltf_calc_size` exist for
* similar purposes.
*
* `cgltf_accessor_read_float` reads a certain element from a non-sparse accessor and converts it to
@ -75,7 +80,7 @@
*
* `cgltf_accessor_read_uint` is similar to its floating-point counterpart, but limited to reading
* vector types and does not support matrix types. The passed-in element size is the number of uints
* in the output buffer, which should be in the range [1, 4]. Returns false if the passed-in
* in the output buffer, which should be in the range [1, 4]. Returns false if the passed-in
* element_size is too small, or if the accessor is sparse.
*
* `cgltf_accessor_read_index` is similar to its floating-point counterpart, but it returns size_t
@ -197,6 +202,7 @@ typedef enum cgltf_type
typedef enum cgltf_primitive_type
{
cgltf_primitive_type_invalid,
cgltf_primitive_type_points,
cgltf_primitive_type_lines,
cgltf_primitive_type_line_loop,
@ -499,6 +505,11 @@ typedef struct cgltf_anisotropy
cgltf_texture_view anisotropy_texture;
} cgltf_anisotropy;
typedef struct cgltf_dispersion
{
cgltf_float dispersion;
} cgltf_dispersion;
typedef struct cgltf_material
{
char* name;
@ -513,6 +524,7 @@ typedef struct cgltf_material
cgltf_bool has_emissive_strength;
cgltf_bool has_iridescence;
cgltf_bool has_anisotropy;
cgltf_bool has_dispersion;
cgltf_pbr_metallic_roughness pbr_metallic_roughness;
cgltf_pbr_specular_glossiness pbr_specular_glossiness;
cgltf_clearcoat clearcoat;
@ -524,6 +536,7 @@ typedef struct cgltf_material
cgltf_emissive_strength emissive_strength;
cgltf_iridescence iridescence;
cgltf_anisotropy anisotropy;
cgltf_dispersion dispersion;
cgltf_texture_view normal_texture;
cgltf_texture_view occlusion_texture;
cgltf_texture_view emissive_texture;
@ -838,7 +851,7 @@ cgltf_size cgltf_component_size(cgltf_component_type component_type);
cgltf_size cgltf_calc_size(cgltf_type type, cgltf_component_type component_type);
cgltf_size cgltf_accessor_unpack_floats(const cgltf_accessor* accessor, cgltf_float* out, cgltf_size float_count);
cgltf_size cgltf_accessor_unpack_indices(const cgltf_accessor* accessor, n">cgltf_uint* out, cgltf_size index_count);
cgltf_size cgltf_accessor_unpack_indices(const cgltf_accessor* accessor, kt">void* out, cgltf_size out_component_size, cgltf_size index_count);
/* this function is deprecated and will be removed in the future; use cgltf_extras::data instead */
cgltf_result cgltf_copy_extras_json(const cgltf_data* data, const cgltf_extras* extras, char* dest, cgltf_size* dest_size);
@ -938,8 +951,8 @@ static int jsmn_parse(jsmn_parser *parser, const char *js, size_t len, jsmntok_t
#ifndef CGLTF_CONSTS
k">static const cgltf_size GlbHeaderSize = 12;
k">static const cgltf_size GlbChunkHeaderSize = 8;
cp">#define GlbHeaderSize 12
cp">#define GlbChunkHeaderSize 8
static const uint32_t GlbVersion = 2;
static const uint32_t GlbMagic = 0x46546C67;
static const uint32_t GlbMagicJsonChunk = 0x4E4F534A;
@ -1033,7 +1046,7 @@ static cgltf_result cgltf_default_file_read(const struct cgltf_memory_options* m
fclose(file);
return cgltf_result_out_of_memory;
}
cgltf_size read_size = fread(file_data, 1, file_size, file);
fclose(file);
@ -1141,7 +1154,7 @@ cgltf_result cgltf_parse(const cgltf_options* options, const void* data, cgltf_s
// JSON chunk: length
uint32_t json_length;
memcpy(&json_length, json_chunk, 4);
if (GlbHeaderSize + GlbChunkHeaderSize + json_length > size)
if (json_length > size - GlbHeaderSize - GlbChunkHeaderSize)
{
return cgltf_result_data_too_short;
}
@ -1158,7 +1171,7 @@ cgltf_result cgltf_parse(const cgltf_options* options, const void* data, cgltf_s
const void* bin = NULL;
cgltf_size bin_size = 0;
if (GlbHeaderSize + GlbChunkHeaderSize + json_length + GlbChunkHeaderSize <= size)
if (GlbChunkHeaderSize <= size - GlbHeaderSize - GlbChunkHeaderSize - json_length)
{
// We can read another chunk
const uint8_t* bin_chunk = json_chunk + json_length;
@ -1166,7 +1179,7 @@ cgltf_result cgltf_parse(const cgltf_options* options, const void* data, cgltf_s
// Bin chunk: length
uint32_t bin_length;
memcpy(&bin_length, bin_chunk, 4);
if (GlbHeaderSize + GlbChunkHeaderSize + json_length + GlbChunkHeaderSize + bin_length > size)
if (bin_length > size - GlbHeaderSize - GlbChunkHeaderSize - json_length - GlbChunkHeaderSize)
{
return cgltf_result_data_too_short;
}
@ -1552,6 +1565,9 @@ cgltf_result cgltf_validate(cgltf_data* data)
{
cgltf_accessor* accessor = &data->accessors[i];
CGLTF_ASSERT_IF(data->accessors[i].component_type == cgltf_component_type_invalid, cgltf_result_invalid_gltf);
CGLTF_ASSERT_IF(data->accessors[i].type == cgltf_type_invalid, cgltf_result_invalid_gltf);
cgltf_size element_size = cgltf_calc_size(accessor->type, accessor->component_type);
if (accessor->buffer_view)
@ -1565,7 +1581,7 @@ cgltf_result cgltf_validate(cgltf_data* data)
{
cgltf_accessor_sparse* sparse = &accessor->sparse;
cgltf_size indices_component_size = cgltf_calc_size(cgltf_type_scalar, sparse->indices_component_type);
cgltf_size indices_component_size = cgltf_component_size(sparse->indices_component_type);
cgltf_size indices_req_size = sparse->indices_byte_offset + indices_component_size * sparse->count;
cgltf_size values_req_size = sparse->values_byte_offset + element_size * sparse->count;
@ -1631,43 +1647,48 @@ cgltf_result cgltf_validate(cgltf_data* data)
for (cgltf_size j = 0; j < data->meshes[i].primitives_count; ++j)
{
CGLTF_ASSERT_IF(data->meshes[i].primitives[j].type == cgltf_primitive_type_invalid, cgltf_result_invalid_gltf);
CGLTF_ASSERT_IF(data->meshes[i].primitives[j].targets_count != data->meshes[i].primitives[0].targets_count, cgltf_result_invalid_gltf);
if (data->meshes[i].primitives[j].attributes_count)
CGLTF_ASSERT_IF(data->meshes[i].primitives[j].attributes_count == 0, cgltf_result_invalid_gltf);
cgltf_accessor* first = data->meshes[i].primitives[j].attributes[0].data;
CGLTF_ASSERT_IF(first->count == 0, cgltf_result_invalid_gltf);
for (cgltf_size k = 0; k < data->meshes[i].primitives[j].attributes_count; ++k)
{
cgltf_accessor* first = data->meshes[i].primitives[j].attributes[0].data;
CGLTF_ASSERT_IF(data->meshes[i].primitives[j].attributes[k].data->count != first->count, cgltf_result_invalid_gltf);
}
for (cgltf_size k = 0; k < data->meshes[i].primitives[j].attributes_count; ++k)
for (cgltf_size k = 0; k < data->meshes[i].primitives[j].targets_count; ++k)
{
for (cgltf_size m = 0; m < data->meshes[i].primitives[j].targets[k].attributes_count; ++m)
{
CGLTF_ASSERT_IF(data->meshes[i].primitives[j].attributes[k].data->count != first->count, cgltf_result_invalid_gltf);
CGLTF_ASSERT_IF(data->meshes[i].primitives[j].targets[k].attributes[m].data->count != first->count, cgltf_result_invalid_gltf);
}
}
for (cgltf_size k = 0; k < data->meshes[i].primitives[j].targets_count; ++k)
{
for (cgltf_size m = 0; m < data->meshes[i].primitives[j].targets[k].attributes_count; ++m)
{
CGLTF_ASSERT_IF(data->meshes[i].primitives[j].targets[k].attributes[m].data->count != first->count, cgltf_result_invalid_gltf);
}
}
cgltf_accessor* indices = data->meshes[i].primitives[j].indices;
cgltf_accessor* indices = data->meshes[i].primitives[j].indices;
CGLTF_ASSERT_IF(indices &&
indices->component_type != cgltf_component_type_r_8u &&
indices->component_type != cgltf_component_type_r_16u &&
indices->component_type != cgltf_component_type_r_32u, cgltf_result_invalid_gltf);
CGLTF_ASSERT_IF(indices &&
indices->component_type != cgltf_component_type_r_8u &&
indices->component_type != cgltf_component_type_r_16u &&
indices->component_type != cgltf_component_type_r_32u, cgltf_result_invalid_gltf);
CGLTF_ASSERT_IF(indices && indices->type != cgltf_type_scalar, cgltf_result_invalid_gltf);
CGLTF_ASSERT_IF(indices && indices->stride != cgltf_component_size(indices->component_type), cgltf_result_invalid_gltf);
if (indices && indices->buffer_view && indices->buffer_view->buffer->data)
{
cgltf_size index_bound = cgltf_calc_index_bound(indices->buffer_view, indices->offset, indices->component_type, indices->count);
if (indices && indices->buffer_view && indices->buffer_view->buffer->data)
{
cgltf_size index_bound = cgltf_calc_index_bound(indices->buffer_view, indices->offset, indices->component_type, indices->count);
CGLTF_ASSERT_IF(index_bound >= first->count, cgltf_result_data_too_short);
}
CGLTF_ASSERT_IF(index_bound >= first->count, cgltf_result_data_too_short);
}
for (cgltf_size k = 0; k < data->meshes[i].primitives[j].mappings_count; ++k)
{
CGLTF_ASSERT_IF(data->meshes[i].primitives[j].mappings[k].variant >= data->variants_count, cgltf_result_invalid_gltf);
}
for (cgltf_size k = 0; k < data->meshes[i].primitives[j].mappings_count; ++k)
{
CGLTF_ASSERT_IF(data->meshes[i].primitives[j].mappings[k].variant >= data->variants_count, cgltf_result_invalid_gltf);
}
}
}
@ -1724,10 +1745,15 @@ cgltf_result cgltf_validate(cgltf_data* data)
cgltf_size values = channel->sampler->interpolation == cgltf_interpolation_type_cubic_spline ? 3 : 1;
CGLTF_ASSERT_IF(channel->sampler->input->count * components * values != channel->sampler->output->count, cgltf_result_data_too_short);
CGLTF_ASSERT_IF(channel->sampler->input->count * components * values != channel->sampler->output->count, cgltf_result_invalid_gltf);
}
}
for (cgltf_size i = 0; i < data->variants_count; ++i)
{
CGLTF_ASSERT_IF(!data->variants[i].name, cgltf_result_invalid_gltf);
}
return cgltf_result_success;
}
@ -1902,7 +1928,7 @@ void cgltf_free(cgltf_data* data)
data->memory.free_func(data->memory.user_data, data->materials);
for (cgltf_size i = 0; i < data->images_count; ++i)
for (cgltf_size i = 0; i < data->images_count; ++i)
{
data->memory.free_func(data->memory.user_data, data->images[i].name);
data->memory.free_func(data->memory.user_data, data->images[i].uri);
@ -2550,7 +2576,7 @@ cgltf_size cgltf_animation_channel_index(const cgltf_animation* animation, const
return (cgltf_size)(object - animation->channels);
}
cgltf_size cgltf_accessor_unpack_indices(const cgltf_accessor* accessor, n">cgltf_uint* out, cgltf_size index_count)
cgltf_size cgltf_accessor_unpack_indices(const cgltf_accessor* accessor, kt">void* out, cgltf_size out_component_size, cgltf_size index_count)
{
if (out == NULL)
{
@ -2558,6 +2584,7 @@ cgltf_size cgltf_accessor_unpack_indices(const cgltf_accessor* accessor, cgltf_u
}
index_count = accessor->count < index_count ? accessor->count : index_count;
cgltf_size index_component_size = cgltf_component_size(accessor->component_type);
if (accessor->is_sparse)
{
@ -2567,6 +2594,10 @@ cgltf_size cgltf_accessor_unpack_indices(const cgltf_accessor* accessor, cgltf_u
{
return 0;
}
if (index_component_size > out_component_size)
{
return 0;
}
const uint8_t* element = cgltf_buffer_view_data(accessor->buffer_view);
if (element == NULL)
{
@ -2574,18 +2605,29 @@ cgltf_size cgltf_accessor_unpack_indices(const cgltf_accessor* accessor, cgltf_u
}
element += accessor->offset;
if (accessor->component_type == cgltf_component_type_r_32u && accessor->stride == k">sizeof(cgltf_uint))
if (index_component_size == out_component_size && accessor->stride == n">out_component_size)
{
memcpy(out, element, index_count * sizeof(cgltf_uint));
memcpy(out, element, index_count * index_component_size);
return index_count;
}
else
{
cgltf_uint* dest = out;
for (cgltf_size index = 0; index < index_count; index++, dest++, element += accessor->stride)
// The component size of the output array is larger than the component size of the index data, so index data will be padded.
switch (out_component_size)
{
case 2:
for (cgltf_size index = 0; index < index_count; index++, element += accessor->stride)
{
((uint16_t*)out)[index] = (uint16_t)cgltf_component_read_index(element, accessor->component_type);
}
break;
case 4:
for (cgltf_size index = 0; index < index_count; index++, element += accessor->stride)
{
*dest = (cgltf_uint)cgltf_component_read_index(element, accessor->component_type);
p">((uint32_t*)out)[index] = (uint32_t)cgltf_component_read_index(element, accessor->component_type);
}
break;
default:
break;
}
return index_count;
@ -2596,7 +2638,7 @@ cgltf_size cgltf_accessor_unpack_indices(const cgltf_accessor* accessor, cgltf_u
#define CGLTF_ERROR_LEGACY -3
#define CGLTF_CHECK_TOKTYPE(tok_, type_) if ((tok_).type != (type_)) { return CGLTF_ERROR_JSON; }
#define CGLTF_CHECK_TOKTYPE_RETTYPE(tok_, type_, ret_) if ((tok_).type != (type_)) { return (ret_)CGLTF_ERROR_JSON; }
#define CGLTF_CHECK_TOKTYPE_RET(tok_, type_, ret_) if ((tok_).type != (type_)) { return ret_; }
#define CGLTF_CHECK_KEY(tok_) if ((tok_).type != JSMN_STRING || (tok_).size == 0) { return CGLTF_ERROR_JSON; } /* checking size for 0 verifies that a value follows the key */
#define CGLTF_PTRINDEX(type, idx) (type*)((cgltf_size)idx + 1)
@ -2623,12 +2665,13 @@ static int cgltf_json_to_int(jsmntok_t const* tok, const uint8_t* json_chunk)
static cgltf_size cgltf_json_to_size(jsmntok_t const* tok, const uint8_t* json_chunk)
{
CGLTF_CHECK_TOKTYPE_RETTYPE(*tok, JSMN_PRIMITIVE, n">cgltf_size);
CGLTF_CHECK_TOKTYPE_RET(*tok, JSMN_PRIMITIVE, mi">0);
char tmp[128];
int size = (size_t)(tok->end - tok->start) < sizeof(tmp) ? (int)(tok->end - tok->start) : (int)(sizeof(tmp) - 1);
strncpy(tmp, (const char*)json_chunk + tok->start, size);
tmp[size] = 0;
return (cgltf_size)CGLTF_ATOLL(tmp);
long long res = CGLTF_ATOLL(tmp);
return res < 0 ? 0 : (cgltf_size)res;
}
static cgltf_float cgltf_json_to_float(jsmntok_t const* tok, const uint8_t* json_chunk)
@ -2810,6 +2853,11 @@ static void cgltf_parse_attribute_type(const char* name, cgltf_attribute_type* o
if (us && *out_type != cgltf_attribute_type_invalid)
{
*out_index = CGLTF_ATOI(us + 1);
if (*out_index < 0)
{
*out_type = cgltf_attribute_type_invalid;
*out_index = 0;
}
}
}
@ -3142,6 +3190,31 @@ static int cgltf_parse_json_material_mappings(cgltf_options* options, jsmntok_t
return i;
}
static cgltf_primitive_type cgltf_json_to_primitive_type(jsmntok_t const* tok, const uint8_t* json_chunk)
{
int type = cgltf_json_to_int(tok, json_chunk);
switch (type)
{
case 0:
return cgltf_primitive_type_points;
case 1:
return cgltf_primitive_type_lines;
case 2:
return cgltf_primitive_type_line_loop;
case 3:
return cgltf_primitive_type_line_strip;
case 4:
return cgltf_primitive_type_triangles;
case 5:
return cgltf_primitive_type_triangle_strip;
case 6:
return cgltf_primitive_type_triangle_fan;
default:
return cgltf_primitive_type_invalid;
}
}
static int cgltf_parse_json_primitive(cgltf_options* options, jsmntok_t const* tokens, int i, const uint8_t* json_chunk, cgltf_primitive* out_prim)
{
CGLTF_CHECK_TOKTYPE(tokens[i], JSMN_OBJECT);
@ -3158,9 +3231,7 @@ static int cgltf_parse_json_primitive(cgltf_options* options, jsmntok_t const* t
if (cgltf_json_strcmp(tokens+i, json_chunk, "mode") == 0)
{
++i;
out_prim->type
= (cgltf_primitive_type)
cgltf_json_to_int(tokens+i, json_chunk);
out_prim->type = cgltf_json_to_primitive_type(tokens+i, json_chunk);
++i;
}
else if (cgltf_json_strcmp(tokens+i, json_chunk, "indices") == 0)
@ -3410,7 +3481,7 @@ static int cgltf_parse_json_accessor_sparse(jsmntok_t const* tokens, int i, cons
if (cgltf_json_strcmp(tokens+i, json_chunk, "count") == 0)
{
++i;
out_sparse->count = cgltf_json_to_int(tokens + i, json_chunk);
out_sparse->count = cgltf_json_to_size(tokens + i, json_chunk);
++i;
}
else if (cgltf_json_strcmp(tokens+i, json_chunk, "indices") == 0)
@ -3546,8 +3617,7 @@ static int cgltf_parse_json_accessor(cgltf_options* options, jsmntok_t const* to
else if (cgltf_json_strcmp(tokens+i, json_chunk, "count") == 0)
{
++i;
out_accessor->count =
cgltf_json_to_int(tokens+i, json_chunk);
out_accessor->count = cgltf_json_to_size(tokens+i, json_chunk);
++i;
}
else if (cgltf_json_strcmp(tokens+i, json_chunk, "type") == 0)
@ -3700,7 +3770,7 @@ static int cgltf_parse_json_texture_view(cgltf_options* options, jsmntok_t const
out_texture_view->texcoord = cgltf_json_to_int(tokens + i, json_chunk);
++i;
}
else if (cgltf_json_strcmp(tokens + i, json_chunk, "scale") == 0)
else if (cgltf_json_strcmp(tokens + i, json_chunk, "scale") == 0)
{
++i;
out_texture_view->scale = cgltf_json_to_float(tokens + i, json_chunk);
@ -3769,11 +3839,11 @@ static int cgltf_parse_json_pbr_metallic_roughness(cgltf_options* options, jsmnt
if (cgltf_json_strcmp(tokens+i, json_chunk, "metallicFactor") == 0)
{
++i;
out_pbr->metallic_factor =
out_pbr->metallic_factor =
cgltf_json_to_float(tokens + i, json_chunk);
++i;
}
else if (cgltf_json_strcmp(tokens+i, json_chunk, "roughnessFactor") == 0)
else if (cgltf_json_strcmp(tokens+i, json_chunk, "roughnessFactor") == 0)
{
++i;
out_pbr->roughness_factor =
@ -4234,6 +4304,37 @@ static int cgltf_parse_json_anisotropy(cgltf_options* options, jsmntok_t const*
return i;
}
static int cgltf_parse_json_dispersion(jsmntok_t const* tokens, int i, const uint8_t* json_chunk, cgltf_dispersion* out_dispersion)
{
CGLTF_CHECK_TOKTYPE(tokens[i], JSMN_OBJECT);
int size = tokens[i].size;
++i;
for (int j = 0; j < size; ++j)
{
CGLTF_CHECK_KEY(tokens[i]);
if (cgltf_json_strcmp(tokens + i, json_chunk, "dispersion") == 0)
{
++i;
out_dispersion->dispersion = cgltf_json_to_float(tokens + i, json_chunk);
++i;
}
else
{
i = cgltf_skip_json(tokens, i + 1);
}
if (i < 0)
{
return i;
}
}
return i;
}
static int cgltf_parse_json_image(cgltf_options* options, jsmntok_t const* tokens, int i, const uint8_t* json_chunk, cgltf_image* out_image)
{
CGLTF_CHECK_TOKTYPE(tokens[i], JSMN_OBJECT);
@ -4241,11 +4342,11 @@ static int cgltf_parse_json_image(cgltf_options* options, jsmntok_t const* token
int size = tokens[i].size;
++i;
for (int j = 0; j < size; ++j)
for (int j = 0; j < size; ++j)
{
CGLTF_CHECK_KEY(tokens[i]);
if (cgltf_json_strcmp(tokens + i, json_chunk, "uri") == 0)
if (cgltf_json_strcmp(tokens + i, json_chunk, "uri") == 0)
{
i = cgltf_parse_json_string(options, tokens, i + 1, json_chunk, &out_image->uri);
}
@ -4325,7 +4426,7 @@ static int cgltf_parse_json_sampler(cgltf_options* options, jsmntok_t const* tok
= cgltf_json_to_int(tokens + i, json_chunk);
++i;
}
else if (cgltf_json_strcmp(tokens + i, json_chunk, "wrapT") == 0)
else if (cgltf_json_strcmp(tokens + i, json_chunk, "wrapT") == 0)
{
++i;
out_sampler->wrap_t
@ -4375,7 +4476,7 @@ static int cgltf_parse_json_texture(cgltf_options* options, jsmntok_t const* tok
out_texture->sampler = CGLTF_PTRINDEX(cgltf_sampler, cgltf_json_to_int(tokens + i, json_chunk));
++i;
}
else if (cgltf_json_strcmp(tokens + i, json_chunk, "source") == 0)
else if (cgltf_json_strcmp(tokens + i, json_chunk, "source") == 0)
{
++i;
out_texture->image = CGLTF_PTRINDEX(cgltf_image, cgltf_json_to_int(tokens + i, json_chunk));
@ -4627,6 +4728,11 @@ static int cgltf_parse_json_material(cgltf_options* options, jsmntok_t const* to
out_material->has_anisotropy = 1;
i = cgltf_parse_json_anisotropy(options, tokens, i + 1, json_chunk, &out_material->anisotropy);
}
else if (cgltf_json_strcmp(tokens + i, json_chunk, "KHR_materials_dispersion") == 0)
{
out_material->has_dispersion = 1;
i = cgltf_parse_json_dispersion(tokens, i + 1, json_chunk, &out_material->dispersion);
}
else
{
i = cgltf_parse_json_unprocessed_extension(options, tokens, i, json_chunk, &(out_material->extensions[out_material->extensions_count++]));
@ -4786,7 +4892,7 @@ static int cgltf_parse_json_meshopt_compression(cgltf_options* options, jsmntok_
else if (cgltf_json_strcmp(tokens+i, json_chunk, "count") == 0)
{
++i;
out_meshopt_compression->count = cgltf_json_to_int(tokens+i, json_chunk);
out_meshopt_compression->count = cgltf_json_to_size(tokens+i, json_chunk);
++i;
}
else if (cgltf_json_strcmp(tokens+i, json_chunk, "mode") == 0)

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