Started working on IQM/glTF loaders

1 files changed, 2023 insertions, 0 deletions

diff --git a/src/external/cgltf.h b/src/external/cgltf.h
new file mode 100644
index 00000000..ed04d545
--- /dev/null
+++ b/src/external/cgltf.h
@@ -0,0 +1,2023 @@
+#ifndef CGLTF_H_INCLUDED__
+#define CGLTF_H_INCLUDED__
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+
+typedef unsigned long cgltf_size;
+typedef float cgltf_float;
+typedef int cgltf_bool;
+
+typedef enum cgltf_file_type
+{
+	cgltf_file_type_invalid,
+	cgltf_file_type_gltf,
+	cgltf_file_type_glb,
+} cgltf_file_type;
+
+typedef struct cgltf_options
+{
+	cgltf_file_type type;
+	cgltf_size json_token_count; /* 0 == auto */
+	void* (*memory_alloc)(void* user, cgltf_size size);
+	void (*memory_free) (void* user, void* ptr);
+	void* memory_user_data;
+} cgltf_options;
+
+typedef enum cgltf_result
+{
+	cgltf_result_success,
+	cgltf_result_data_too_short,
+	cgltf_result_unknown_format,
+	cgltf_result_invalid_json,
+	cgltf_result_invalid_options,
+} cgltf_result;
+
+typedef enum cgltf_buffer_view_type
+{
+	cgltf_buffer_view_type_invalid,
+	cgltf_buffer_view_type_indices,
+	cgltf_buffer_view_type_vertices,
+} cgltf_buffer_view_type;
+
+typedef enum cgltf_attribute_type
+{
+	cgltf_attribute_type_invalid,
+	cgltf_attribute_type_position,
+	cgltf_attribute_type_normal,
+	cgltf_attribute_type_tangent,
+	cgltf_attribute_type_texcoord_0,
+	cgltf_attribute_type_texcoord_1,
+	cgltf_attribute_type_color_0,
+	cgltf_attribute_type_joints_0,
+	cgltf_attribute_type_weights_0,
+} cgltf_attribute_type;
+
+typedef enum cgltf_component_type
+{
+	cgltf_component_type_invalid,
+	cgltf_component_type_rgb_32f,
+	cgltf_component_type_rgba_32f,
+	cgltf_component_type_rg_32f,
+	cgltf_component_type_rg_8,
+	cgltf_component_type_rg_16,
+	cgltf_component_type_rgba_8,
+	cgltf_component_type_rgba_16,
+	cgltf_component_type_r_8,
+	cgltf_component_type_r_8u,
+	cgltf_component_type_r_16,
+	cgltf_component_type_r_16u,
+	cgltf_component_type_r_32u,
+	cgltf_component_type_r_32f,
+} cgltf_component_type;
+
+typedef enum cgltf_type
+{
+	cgltf_type_invalid,
+	cgltf_type_scalar,
+	cgltf_type_vec2,
+	cgltf_type_vec3,
+	cgltf_type_vec4,
+	cgltf_type_mat2,
+	cgltf_type_mat3,
+	cgltf_type_mat4,
+} cgltf_type;
+
+typedef enum cgltf_primitive_type
+{
+	cgltf_type_points,
+	cgltf_type_lines,
+	cgltf_type_line_loop,
+	cgltf_type_line_strip,
+	cgltf_type_triangles,
+	cgltf_type_triangle_strip,
+	cgltf_type_triangle_fan,
+} cgltf_primitive_type;
+
+typedef struct cgltf_buffer
+{
+	cgltf_size size;
+	char* uri;
+} cgltf_buffer;
+
+typedef struct cgltf_buffer_view
+{
+	cgltf_buffer* buffer;
+	cgltf_size offset;
+	cgltf_size size;
+	cgltf_size stride; /* 0 == automatically determined by accessor */
+	cgltf_buffer_view_type type;
+} cgltf_buffer_view;
+
+typedef struct cgltf_accessor
+{
+	cgltf_component_type component_type;
+	cgltf_type type;
+	cgltf_size offset;
+	cgltf_size count;
+	cgltf_size stride;
+	cgltf_buffer_view* buffer_view;
+} cgltf_accessor;
+
+typedef struct cgltf_attribute
+{
+	cgltf_attribute_type name;
+	cgltf_accessor* data;
+} cgltf_attribute;
+
+
+typedef struct cgltf_rgba 
+{
+	cgltf_float r;
+	cgltf_float g;
+	cgltf_float b;
+	cgltf_float a;
+} cgltf_rgba;
+
+typedef struct cgltf_image 
+{
+	char* uri;
+	cgltf_buffer_view* buffer_view;
+	char* mime_type;
+} cgltf_image;
+
+typedef struct cgltf_sampler
+{
+	cgltf_float mag_filter;
+	cgltf_float min_filter;
+	cgltf_float wrap_s;
+	cgltf_float wrap_t;
+} cgltf_sampler;
+
+typedef struct cgltf_texture
+{
+	cgltf_image* image;
+	cgltf_sampler* sampler;
+} cgltf_texture;
+
+typedef struct cgltf_texture_view
+{	
+	cgltf_texture* texture;
+	cgltf_size texcoord;
+	cgltf_float scale;
+} cgltf_texture_view;
+
+typedef struct cgltf_pbr
+{
+	cgltf_texture_view base_color_texture;
+	cgltf_texture_view metallic_roughness_texture;
+
+	cgltf_rgba base_color;
+	cgltf_float metallic_factor;
+	cgltf_float roughness_factor;
+} cgltf_pbr;
+
+typedef struct cgltf_material
+{
+	char* name;
+	cgltf_pbr pbr;
+	cgltf_rgba emissive_color;
+	cgltf_texture_view normal_texture;
+	cgltf_texture_view emissive_texture;
+	cgltf_texture_view occlusion_texture;
+	cgltf_bool double_sided;
+} cgltf_material;
+
+typedef struct cgltf_primitive {
+	cgltf_primitive_type type;
+	cgltf_accessor* indices;
+	cgltf_material* material;
+	cgltf_attribute* attributes;
+	cgltf_size attributes_count;
+} cgltf_primitive;
+
+typedef struct cgltf_mesh {
+	char* name;
+	cgltf_primitive* primitives;
+	cgltf_size primitives_count;
+} cgltf_mesh;
+
+typedef struct cgltf_data
+{
+	unsigned version;
+	cgltf_file_type file_type;
+
+	cgltf_mesh* meshes;
+	cgltf_size meshes_count;
+
+	cgltf_material* materials;
+	cgltf_size materials_count;
+
+	cgltf_accessor* accessors;
+	cgltf_size accessors_count;
+
+	cgltf_buffer_view* buffer_views;
+	cgltf_size buffer_views_count;
+
+	cgltf_buffer* buffers;
+	cgltf_size buffers_count;
+
+	cgltf_image* images;
+	cgltf_size images_count;
+
+	cgltf_texture* textures;
+	cgltf_size textures_count;
+
+	cgltf_sampler* samplers;
+	cgltf_size samplers_count;
+
+	const void* bin;
+	cgltf_size bin_size;
+
+	void (*memory_free) (void* user, void* ptr);
+	void* memory_user_data;
+} cgltf_data;
+
+cgltf_result cgltf_parse(
+		const cgltf_options* options,
+		const void* data,
+		cgltf_size size,
+		cgltf_data* out_data);
+
+void cgltf_free(cgltf_data* data);
+
+#endif /* #ifndef CGLTF_H_INCLUDED__ */
+
+/*
+ *
+ * Stop now, if you are only interested in the API.
+ * Below, you find the implementation.
+ *
+ */
+
+#ifdef __INTELLISENSE__
+/* This makes MSVC intellisense work. */
+#define CGLTF_IMPLEMENTATION
+#endif
+
+#ifdef CGLTF_IMPLEMENTATION
+
+#include <stdint.h> /* For uint8_t, uint32_t */
+#include <string.h> /* For strncpy */
+#include <stdlib.h> /* For malloc, free */
+
+
+/*
+ * -- jsmn.h start --
+ * Source: https://github.com/zserge/jsmn
+ * License: MIT
+ */
+typedef enum {
+	JSMN_UNDEFINED = 0,
+	JSMN_OBJECT = 1,
+	JSMN_ARRAY = 2,
+	JSMN_STRING = 3,
+	JSMN_PRIMITIVE = 4
+} jsmntype_t;
+enum jsmnerr {
+	/* Not enough tokens were provided */
+	JSMN_ERROR_NOMEM = -1,
+	/* Invalid character inside JSON string */
+	JSMN_ERROR_INVAL = -2,
+	/* The string is not a full JSON packet, more bytes expected */
+	JSMN_ERROR_PART = -3
+};
+typedef struct {
+	jsmntype_t type;
+	int start;
+	int end;
+	int size;
+#ifdef JSMN_PARENT_LINKS
+	int parent;
+#endif
+} jsmntok_t;
+typedef struct {
+	unsigned int pos; /* offset in the JSON string */
+	unsigned int toknext; /* next token to allocate */
+	int toksuper; /* superior token node, e.g parent object or array */
+} jsmn_parser;
+void jsmn_init(jsmn_parser *parser);
+int jsmn_parse(jsmn_parser *parser, const char *js, size_t len, jsmntok_t *tokens, unsigned int num_tokens);
+/*
+ * -- jsmn.h end --
+ */
+
+
+static const cgltf_size GltfHeaderSize = 12;
+static const cgltf_size GltfChunkHeaderSize = 8;
+static const uint32_t GltfMagic = 0x46546C67;
+static const uint32_t GltfMagicJsonChunk = 0x4E4F534A;
+static const uint32_t GltfMagicBinChunk = 0x004E4942;
+
+static void* cgltf_mem_alloc(void* user, cgltf_size size)
+{
+	return malloc(size);
+}
+
+static void cgltf_mem_free(void* user, void* ptr)
+{
+	free(ptr);
+}
+
+static cgltf_result cgltf_parse_json(cgltf_options* options, const uint8_t* json_chunk, cgltf_size size, cgltf_data* out_data);
+
+cgltf_result cgltf_parse(const cgltf_options* options, const void* data, cgltf_size size, cgltf_data* out_data)
+{
+	if (size < GltfHeaderSize)
+	{
+		return cgltf_result_data_too_short;
+	}
+
+	if (options == NULL)
+	{
+		return cgltf_result_invalid_options;
+	}
+
+	cgltf_options fixed_options = *options;
+	if (fixed_options.memory_alloc == NULL)
+	{
+		fixed_options.memory_alloc = &cgltf_mem_alloc;
+	}
+	if (fixed_options.memory_free == NULL)
+	{
+		fixed_options.memory_free = &cgltf_mem_free;
+	}
+
+	uint32_t tmp;
+	// Magic
+	memcpy(&tmp, data, 4);
+	if (tmp != GltfMagic)
+	{
+		if (fixed_options.type == cgltf_file_type_invalid)
+		{
+			fixed_options.type = cgltf_file_type_gltf;
+		}
+		else
+		{
+			return cgltf_result_unknown_format;
+		}
+	}
+
+	memset(out_data, 0, sizeof(cgltf_data));
+	out_data->memory_free = fixed_options.memory_free;
+	out_data->memory_user_data = fixed_options.memory_user_data;
+
+	if (fixed_options.type == cgltf_file_type_gltf)
+	{
+		out_data->file_type = cgltf_file_type_gltf;
+		return cgltf_parse_json(&fixed_options, data, size, out_data);
+	}
+
+	const uint8_t* ptr = (const uint8_t*)data;
+	// Version
+	memcpy(&tmp, ptr + 4, 4);
+	out_data->version = tmp;
+
+	// Total length
+	memcpy(&tmp, ptr + 8, 4);
+	if (tmp > size)
+	{
+		return cgltf_result_data_too_short;
+	}
+
+	const uint8_t* json_chunk = ptr + GltfHeaderSize;
+
+	// JSON chunk: length
+	uint32_t json_length;
+	memcpy(&json_length, json_chunk, 4);
+	if (GltfHeaderSize + GltfChunkHeaderSize + json_length > size)
+	{
+		return cgltf_result_data_too_short;
+	}
+
+	// JSON chunk: magic
+	memcpy(&tmp, json_chunk + 4, 4);
+	if (tmp != GltfMagicJsonChunk)
+	{
+		return cgltf_result_unknown_format;
+	}
+
+	json_chunk += GltfChunkHeaderSize;
+	cgltf_result json_result = cgltf_parse_json(&fixed_options, json_chunk, json_length, out_data);
+	if (json_result != cgltf_result_success)
+	{
+		return json_result;
+	}
+
+	out_data->file_type = cgltf_file_type_invalid;
+	if (GltfHeaderSize + GltfChunkHeaderSize + json_length + GltfChunkHeaderSize <= size)
+	{
+		// We can read another chunk
+		const uint8_t* bin_chunk = json_chunk + json_length;
+
+		// Bin chunk: length
+		uint32_t bin_length;
+		memcpy(&bin_length, bin_chunk, 4);
+		if (GltfHeaderSize + GltfChunkHeaderSize + json_length + GltfChunkHeaderSize + bin_length > size)
+		{
+			return cgltf_result_data_too_short;
+		}
+
+		// Bin chunk: magic
+		memcpy(&tmp, bin_chunk + 4, 4);
+		if (tmp != GltfMagicBinChunk)
+		{
+			return cgltf_result_unknown_format;
+		}
+
+		bin_chunk += GltfChunkHeaderSize;
+
+		out_data->file_type = cgltf_file_type_glb;
+		out_data->bin = bin_chunk;
+		out_data->bin_size = bin_length;
+	}
+
+	return cgltf_result_success;
+}
+
+void cgltf_free(cgltf_data* data)
+{
+	data->memory_free(data->memory_user_data, data->accessors);
+	data->memory_free(data->memory_user_data, data->buffer_views);
+
+
+	for (cgltf_size i = 0; i < data->buffers_count; ++i)
+	{
+		data->memory_free(data->memory_user_data, data->buffers[i].uri);
+	}
+	data->memory_free(data->memory_user_data, data->buffers);
+
+	for (cgltf_size i = 0; i < data->meshes_count; ++i)
+	{
+		data->memory_free(data->memory_user_data, data->meshes[i].name);
+		for (cgltf_size j = 0; j < data->meshes[i].primitives_count; ++j)
+		{
+			data->memory_free(data->memory_user_data, data->meshes[i].primitives[j].attributes);
+		}
+		data->memory_free(data->memory_user_data, data->meshes[i].primitives);
+	}
+	data->memory_free(data->memory_user_data, data->meshes);
+
+	for (cgltf_size i = 0; i < data->materials_count; ++i)
+	{
+		data->memory_free(data->memory_user_data, data->materials[i].name);
+	}
+
+	data->memory_free(data->memory_user_data, data->materials);
+
+	for (cgltf_size i = 0; i < data->images_count; ++i) 
+	{
+		data->memory_free(data->memory_user_data, data->images[i].uri);
+		data->memory_free(data->memory_user_data, data->images[i].mime_type);
+	}
+
+	data->memory_free(data->memory_user_data, data->images);
+	data->memory_free(data->memory_user_data, data->textures);
+	data->memory_free(data->memory_user_data, data->samplers);
+}
+
+#define CGLTF_CHECK_TOKTYPE(tok_, type_) if ((tok_).type != (type_)) { return -128; }
+
+static char cgltf_to_lower(char c)
+{
+	if (c >= 'A' && c <= 'Z')
+	{
+		c = 'a' + (c - 'A');
+	}
+	return c;
+}
+
+static int cgltf_json_strcmp(jsmntok_t const* tok, const uint8_t* json_chunk, const char* str)
+{
+	CGLTF_CHECK_TOKTYPE(*tok, JSMN_STRING);
+	int const str_len = strlen(str);
+	int const name_length = tok->end - tok->start;
+	if (name_length == str_len)
+	{
+		for (int i = 0; i < str_len; ++i)
+		{
+			char const a = cgltf_to_lower(*((const char*)json_chunk + tok->start + i));
+			char const b = cgltf_to_lower(*(str + i));
+			if (a < b)
+			{
+				return -1;
+			}
+			else if (a > b)
+			{
+				return 1;
+			}
+		}
+		return 0;
+	}
+	return 128;
+}
+
+static int cgltf_json_to_int(jsmntok_t const* tok, const uint8_t* json_chunk)
+{
+	char tmp[128];
+	CGLTF_CHECK_TOKTYPE(*tok, JSMN_PRIMITIVE);
+	int size = tok->end - tok->start;
+	strncpy(tmp,
+		(const char*)json_chunk + tok->start,
+		size);
+	tmp[size] = 0;
+	return atoi(tmp);
+}
+
+static cgltf_float cgltf_json_to_float(jsmntok_t const* tok, const uint8_t* json_chunk) {
+	char tmp[128];
+	CGLTF_CHECK_TOKTYPE(*tok, JSMN_PRIMITIVE);
+	int size = tok->end - tok->start;
+	strncpy(tmp,
+		(const char*)json_chunk + tok->start,
+		size);
+	tmp[size] = 0;
+	return atof(tmp);
+}
+
+static cgltf_bool cgltf_json_to_bool(jsmntok_t const* tok, const uint8_t* json_chunk) {
+	//TODO: error handling?
+	if (memcmp(json_chunk + tok->start, "true", 4) == 0)
+		return 1;
+
+	return 0;
+}
+
+static int cgltf_skip_json(jsmntok_t const* tokens, int i)
+{
+	if (tokens[i].type == JSMN_ARRAY)
+	{
+		int size = tokens[i].size;
+		++i;
+		for (int j = 0; j < size; ++j)
+		{
+			i = cgltf_skip_json(tokens, i);
+		}
+	}
+	else if (tokens[i].type == JSMN_OBJECT)
+	{
+		int size = tokens[i].size;
+		++i;
+		for (int j = 0; j < size; ++j)
+		{
+			i = cgltf_skip_json(tokens, i);
+			i = cgltf_skip_json(tokens, i);
+		}
+	}
+	else if (tokens[i].type == JSMN_PRIMITIVE
+		 || tokens[i].type == JSMN_STRING)
+	{
+		return i + 1;
+	}
+	return i;
+}
+
+
+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);
+
+	int size = tokens[i].size;
+	++i;
+
+	out_prim->indices = (void* )-1;
+	out_prim->material = NULL;
+
+	for (int j = 0; j < size; ++j)
+	{
+		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);
+			++i;
+		}
+		else if (cgltf_json_strcmp(tokens+i, json_chunk, "indices") == 0)
+		{
+			++i;
+			out_prim->indices =
+					(void*)(size_t)cgltf_json_to_int(tokens+i, json_chunk);
+			++i;
+		}
+		else if (cgltf_json_strcmp(tokens+i, json_chunk, "material") == 0)
+		{
+			++i;
+			out_prim->material =
+				(void*)(size_t)cgltf_json_to_int(tokens+i, json_chunk);
+			++i;
+		}
+		else if (cgltf_json_strcmp(tokens+i, json_chunk, "attributes") == 0)
+		{
+			++i;
+			if (tokens[i].type != JSMN_OBJECT)
+			{
+				return -1;
+			}
+			out_prim->attributes_count = tokens[i].size;
+			out_prim->attributes
+					= options->memory_alloc(options->memory_user_data, sizeof(cgltf_attribute) * tokens[i].size);
+			++i;
+			for (cgltf_size iattr = 0; iattr < out_prim->attributes_count; ++iattr)
+			{
+				CGLTF_CHECK_TOKTYPE(tokens[i], JSMN_STRING);
+				out_prim->attributes[iattr].name = cgltf_attribute_type_invalid;
+				if (cgltf_json_strcmp(tokens+i, json_chunk, "POSITION") == 0)
+				{
+					out_prim->attributes[iattr].name = cgltf_attribute_type_position;
+				}
+				else if (cgltf_json_strcmp(tokens+i, json_chunk, "NORMAL") == 0)
+				{
+					out_prim->attributes[iattr].name = cgltf_attribute_type_normal;
+				}
+				else if (cgltf_json_strcmp(tokens+i, json_chunk, "TANGENT") == 0)
+				{
+					out_prim->attributes[iattr].name = cgltf_attribute_type_tangent;
+				}
+				else if (cgltf_json_strcmp(tokens+i, json_chunk, "TEXCOORD_0") == 0)
+				{
+					out_prim->attributes[iattr].name = cgltf_attribute_type_texcoord_0;
+				}
+				else if (cgltf_json_strcmp(tokens+i, json_chunk, "TEXCOORD_1") == 0)
+				{
+					out_prim->attributes[iattr].name = cgltf_attribute_type_texcoord_1;
+				}
+				else if (cgltf_json_strcmp(tokens+i, json_chunk, "COLOR_0") == 0)
+				{
+					out_prim->attributes[iattr].name = cgltf_attribute_type_color_0;
+				}
+				else if (cgltf_json_strcmp(tokens+i, json_chunk, "JOINTS_0") == 0)
+				{
+					out_prim->attributes[iattr].name = cgltf_attribute_type_joints_0;
+				}
+				else if (cgltf_json_strcmp(tokens+i, json_chunk, "WEIGHTS_0") == 0)
+				{
+					out_prim->attributes[iattr].name = cgltf_attribute_type_weights_0;
+				}
+				++i;
+				out_prim->attributes[iattr].data =
+						(void*)(size_t)cgltf_json_to_int(tokens+i, json_chunk);
+				++i;
+			}
+		}
+		else
+		{
+			i = cgltf_skip_json(tokens, i+1);
+		}
+	}
+
+	return i;
+}
+
+static int cgltf_parse_json_mesh(cgltf_options* options, jsmntok_t const* tokens, int i,
+				 const uint8_t* json_chunk, cgltf_size mesh_index,
+				 cgltf_data* out_data)
+{
+	CGLTF_CHECK_TOKTYPE(tokens[i], JSMN_OBJECT);
+
+	out_data->meshes[mesh_index].name = NULL;
+
+	int size = tokens[i].size;
+	++i;
+
+	for (int j = 0; j < size; ++j)
+	{
+		if (cgltf_json_strcmp(tokens+i, json_chunk, "name") == 0)
+		{
+			++i;
+			int strsize = tokens[i].end - tokens[i].start;
+			out_data->meshes[mesh_index].name = options->memory_alloc(options->memory_user_data, strsize + 1);
+			strncpy(out_data->meshes[mesh_index].name,
+				(const char*)json_chunk + tokens[i].start,
+				strsize);
+			out_data->meshes[mesh_index].name[strsize] = 0;
+			++i;
+		}
+		else if (cgltf_json_strcmp(tokens+i, json_chunk, "primitives") == 0)
+		{
+			++i;
+			if (tokens[i].type != JSMN_ARRAY)
+			{
+				return -1;
+			}
+			out_data->meshes[mesh_index].primitives_count = tokens[i].size;
+			out_data->meshes[mesh_index].primitives = options->memory_alloc(options->memory_user_data, sizeof(cgltf_primitive) * tokens[i].size);
+			++i;
+
+			for (cgltf_size prim_index = 0;
+			     prim_index < out_data->meshes[mesh_index].primitives_count;
+			     ++prim_index)
+			{
+				i = cgltf_parse_json_primitive(options, tokens, i, json_chunk,
+							       &out_data->meshes[mesh_index].primitives[prim_index]);
+				if (i < 0)
+				{
+					return i;
+				}
+			}
+		}
+		else
+		{
+			i = cgltf_skip_json(tokens, i+1);
+		}
+	}
+
+	return i;
+}
+
+static int cgltf_parse_json_meshes(cgltf_options* options, jsmntok_t const* tokens, int i, const uint8_t* json_chunk, cgltf_data* out_data)
+{
+	CGLTF_CHECK_TOKTYPE(tokens[i], JSMN_ARRAY);
+	out_data->meshes_count = tokens[i].size;
+	out_data->meshes = options->memory_alloc(options->memory_user_data, sizeof(cgltf_mesh) * out_data->meshes_count);
+	++i;
+	for (cgltf_size j = 0 ; j < out_data->meshes_count; ++j)
+	{
+		i = cgltf_parse_json_mesh(options, tokens, i, json_chunk, j, out_data);
+		if (i < 0)
+		{
+			return i;
+		}
+	}
+	return i;
+}
+
+static int cgltf_parse_json_accessor(jsmntok_t const* tokens, int i,
+				     const uint8_t* json_chunk, cgltf_size accessor_index,
+				     cgltf_data* out_data)
+{
+	CGLTF_CHECK_TOKTYPE(tokens[i], JSMN_OBJECT);
+
+	memset(&out_data->accessors[accessor_index], 0, sizeof(cgltf_accessor));
+	out_data->accessors[accessor_index].buffer_view = (void*)-1;
+
+	int size = tokens[i].size;
+	++i;
+
+	for (int j = 0; j < size; ++j)
+	{
+		if (cgltf_json_strcmp(tokens+i, json_chunk, "bufferView") == 0)
+		{
+			++i;
+			out_data->accessors[accessor_index].buffer_view =
+					(void*)(size_t)cgltf_json_to_int(tokens+i, json_chunk);
+			++i;
+		}
+		else if (cgltf_json_strcmp(tokens+i, json_chunk, "byteOffset") == 0)
+		{
+			++i;
+			out_data->accessors[accessor_index].offset =
+					cgltf_json_to_int(tokens+i, json_chunk);
+			++i;
+		}
+		else if (cgltf_json_strcmp(tokens+i, json_chunk, "componentType") == 0)
+		{
+			++i;
+			int type = cgltf_json_to_int(tokens+i, json_chunk);
+			switch (type)
+			{
+			case 5120:
+				type = cgltf_component_type_r_8;
+				break;
+			case 5121:
+				type = cgltf_component_type_r_8u;
+				break;
+			case 5122:
+				type = cgltf_component_type_r_16;
+				break;
+			case 5123:
+				type = cgltf_component_type_r_16u;
+				break;
+			case 5125:
+				type = cgltf_component_type_r_32u;
+				break;
+			case 5126:
+				type = cgltf_component_type_r_32f;
+				break;
+			default:
+				type = cgltf_component_type_invalid;
+				break;
+			}
+			out_data->accessors[accessor_index].component_type = type;
+			++i;
+		}
+		else if (cgltf_json_strcmp(tokens+i, json_chunk, "count") == 0)
+		{
+			++i;
+			out_data->accessors[accessor_index].count =
+					cgltf_json_to_int(tokens+i, json_chunk);
+			++i;
+		}
+		else if (cgltf_json_strcmp(tokens+i, json_chunk, "type") == 0)
+		{
+			++i;
+			if (cgltf_json_strcmp(tokens+i, json_chunk, "SCALAR") == 0)
+			{
+				out_data->accessors[accessor_index].type = cgltf_type_scalar;
+			}
+			else if (cgltf_json_strcmp(tokens+i, json_chunk, "VEC2") == 0)
+			{
+				out_data->accessors[accessor_index].type = cgltf_type_vec2;
+			}
+			else if (cgltf_json_strcmp(tokens+i, json_chunk, "VEC3") == 0)
+			{
+				out_data->accessors[accessor_index].type = cgltf_type_vec3;
+			}
+			else if (cgltf_json_strcmp(tokens+i, json_chunk, "VEC4") == 0)
+			{
+				out_data->accessors[accessor_index].type = cgltf_type_vec4;
+			}
+			else if (cgltf_json_strcmp(tokens+i, json_chunk, "MAT2") == 0)
+			{
+				out_data->accessors[accessor_index].type = cgltf_type_mat2;
+			}
+			else if (cgltf_json_strcmp(tokens+i, json_chunk, "MAT3") == 0)
+			{
+				out_data->accessors[accessor_index].type = cgltf_type_mat3;
+			}
+			else if (cgltf_json_strcmp(tokens+i, json_chunk, "MAT4") == 0)
+			{
+				out_data->accessors[accessor_index].type = cgltf_type_mat4;
+			}
+			++i;
+		}
+		else
+		{
+			i = cgltf_skip_json(tokens, i+1);
+		}
+	}
+
+	return i;
+}
+
+static int cgltf_parse_json_rgba(jsmntok_t const* tokens, int i, const uint8_t* json_chunk, cgltf_rgba* out)
+{
+	int components = tokens[i].size;
+	if (components >= 2) {
+		out->r = cgltf_json_to_float(tokens + ++i, json_chunk);
+		out->g = cgltf_json_to_float(tokens + ++i, json_chunk);
+
+		if (components > 2)
+			out->b = cgltf_json_to_float(tokens + ++i, json_chunk);
+
+		if (components > 3)
+			out->a = cgltf_json_to_float(tokens + ++i, json_chunk);
+	}
+	else {
+		out->r = cgltf_json_to_float(tokens + ++i, json_chunk);
+		out->g = out->r;
+		out->b = out->r;
+		out->a = out->r;
+	}
+
+	return ++i;
+}
+
+static int cgltf_parse_json_texture_view(jsmntok_t const* tokens, int i, const uint8_t* json_chunk, cgltf_texture_view* out) {
+
+	CGLTF_CHECK_TOKTYPE(tokens[i], JSMN_OBJECT);
+	int size = tokens[i].size;
+	++i;
+
+	for (int j = 0; j < size; ++j)
+	{
+		if (cgltf_json_strcmp(tokens + i, json_chunk, "index") == 0)
+		{
+			++i;
+			out->texture = (void*)(size_t)cgltf_json_to_int(tokens + i, json_chunk);
+			++i;
+		}
+		else if (cgltf_json_strcmp(tokens + i, json_chunk, "texCoord") == 0)
+		{
+			++i;
+			out->texcoord = cgltf_json_to_int(tokens + i, json_chunk);
+			++i;
+		}
+		else if (cgltf_json_strcmp(tokens + i, json_chunk, "scale") == 0) 
+		{
+			++i;
+			out->scale = cgltf_json_to_float(tokens + i, json_chunk);
+			++i;
+		}
+		else
+		{
+			i = cgltf_skip_json(tokens, i + 1);
+		}
+	}
+
+	return i;
+}
+
+static int cgltf_parse_json_pbr(jsmntok_t const* tokens, int i,
+				     const uint8_t* json_chunk, cgltf_size mat_index, cgltf_data* out_data)
+{
+	CGLTF_CHECK_TOKTYPE(tokens[i], JSMN_OBJECT);
+	int size = tokens[i].size;
+	++i;
+
+	for (int j = 0; j < size; ++j)
+	{
+		if (cgltf_json_strcmp(tokens+i, json_chunk, "metallicFactor") == 0)
+		{
+			++i;
+			out_data->materials[mat_index].pbr.metallic_factor = 
+				cgltf_json_to_float(tokens + i, json_chunk);
+			++i;
+		}
+		else if (cgltf_json_strcmp(tokens+i, json_chunk, "roughnessFactor") == 0) 
+		{
+			++i;
+			out_data->materials[mat_index].pbr.roughness_factor =
+				cgltf_json_to_float(tokens+i, json_chunk);
+			++i;
+		}
+		else if (cgltf_json_strcmp(tokens+i, json_chunk, "baseColorFactor") == 0)
+		{
+			i = cgltf_parse_json_rgba(tokens, i + 1, json_chunk,
+					&(out_data->materials[mat_index].pbr.base_color));
+		}
+		else if (cgltf_json_strcmp(tokens+i, json_chunk, "baseColorTexture") == 0)
+		{
+			i = cgltf_parse_json_texture_view(tokens, i + 1, json_chunk,
+				&(out_data->materials[mat_index].pbr.base_color_texture));
+		}
+		else if (cgltf_json_strcmp(tokens + i, json_chunk, "metallicRoughnessTexture") == 0)
+		{
+			i = cgltf_parse_json_texture_view(tokens, i + 1, json_chunk,
+				&(out_data->materials[mat_index].pbr.metallic_roughness_texture));
+		}
+		else
+		{
+			i = cgltf_skip_json(tokens, i+1);
+		}
+	}
+
+	return i;
+}
+
+static int cgltf_parse_json_image(cgltf_options* options, jsmntok_t const* tokens, int i,
+	const uint8_t* json_chunk, cgltf_size img_index, cgltf_data* out_data) 
+{
+	CGLTF_CHECK_TOKTYPE(tokens[i], JSMN_OBJECT);
+
+	memset(&out_data->images[img_index], 0, sizeof(cgltf_image));
+	int size = tokens[i].size;
+	++i;
+
+	out_data->images[img_index].buffer_view = (void*)-1;
+
+	for (int j = 0; j < size; ++j) 
+	{
+		if (cgltf_json_strcmp(tokens + i, json_chunk, "uri") == 0) 
+		{
+			++i;
+			int strsize = tokens[i].end - tokens[i].start;
+			out_data->images[img_index].uri = options->memory_alloc(options->memory_user_data, strsize + 1);
+			strncpy(out_data->images[img_index].uri,
+				(const char*)json_chunk + tokens[i].start,
+				strsize);
+			out_data->images[img_index].uri[strsize] = 0;
+			++i;
+		}
+		else if (cgltf_json_strcmp(tokens+i, json_chunk, "bufferView") == 0)
+		{
+			++i;
+			out_data->images[img_index].buffer_view =
+					(void*)(size_t)cgltf_json_to_int(tokens+i, json_chunk);
+			++i;
+		}
+		else if (cgltf_json_strcmp(tokens + i, json_chunk, "mimeType") == 0)
+		{
+			++i;
+			int strsize = tokens[i].end - tokens[i].start;
+			out_data->images[img_index].mime_type = options->memory_alloc(options->memory_user_data, strsize + 1);
+			strncpy(out_data->images[img_index].mime_type,
+				(const char*)json_chunk + tokens[i].start,
+				strsize);
+			out_data->images[img_index].mime_type[strsize] = 0;
+			++i;
+		}
+		else
+		{
+			i = cgltf_skip_json(tokens, i + 1);
+		}
+	}
+
+	return i;
+}
+
+static int cgltf_parse_json_sampler(cgltf_options* options, jsmntok_t const* tokens, int i,
+	const uint8_t* json_chunk, cgltf_size smp_index, cgltf_data* out_data) {
+	CGLTF_CHECK_TOKTYPE(tokens[i], JSMN_OBJECT);
+
+	memset(&out_data->samplers[smp_index], 0, sizeof(cgltf_sampler));
+	int size = tokens[i].size;
+	++i;
+
+	for (int j = 0; j < size; ++j)
+	{
+		if (cgltf_json_strcmp(tokens + i, json_chunk, "magFilter") == 0) 
+		{
+			++i;
+			out_data->samplers[smp_index].mag_filter
+				= cgltf_json_to_int(tokens + i, json_chunk);
+			++i;
+		}
+		else if (cgltf_json_strcmp(tokens + i, json_chunk, "minFilter") == 0)
+		{
+			++i;
+			out_data->samplers[smp_index].min_filter
+				= cgltf_json_to_int(tokens + i, json_chunk);
+			++i;
+		}
+		else if (cgltf_json_strcmp(tokens + i, json_chunk, "wrapS") == 0)
+		{
+			++i;
+			out_data->samplers[smp_index].wrap_s
+				= cgltf_json_to_int(tokens + i, json_chunk);
+			++i;
+		}
+		else if (cgltf_json_strcmp(tokens + i, json_chunk, "wrapT") == 0) 
+		{
+			++i;
+			out_data->samplers[smp_index].wrap_t
+				= cgltf_json_to_int(tokens + i, json_chunk);
+			++i;
+		}
+		else
+		{
+			i = cgltf_skip_json(tokens, i + 1);
+		}
+	}
+
+	return i;
+}
+
+
+static int cgltf_parse_json_texture(cgltf_options* options, jsmntok_t const* tokens, int i,
+	const uint8_t* json_chunk, cgltf_size tex_index, cgltf_data* out_data) {
+	CGLTF_CHECK_TOKTYPE(tokens[i], JSMN_OBJECT);
+
+	memset(&out_data->textures[tex_index], 0, sizeof(cgltf_texture));
+	out_data->textures[tex_index].image = (void*)-1;
+	out_data->textures[tex_index].sampler = (void*)-1;
+
+	int size = tokens[i].size;
+	++i;
+
+	for (int j = 0; j < size; ++j)
+	{
+		if (cgltf_json_strcmp(tokens + i, json_chunk, "sampler") == 0)
+		{
+			++i;
+			out_data->textures[tex_index].sampler 
+				= (void*)(size_t)cgltf_json_to_int(tokens + i, json_chunk);
+			++i;
+		}
+		else if (cgltf_json_strcmp(tokens + i, json_chunk, "source") == 0) 
+		{
+			++i;
+			out_data->textures[tex_index].image
+				= (void*)(size_t)cgltf_json_to_int(tokens + i, json_chunk);
+			++i;
+		}
+		else
+		{
+			i = cgltf_skip_json(tokens, i + 1);
+		}
+	}
+
+	return i;
+}
+
+static int cgltf_parse_json_material(cgltf_options* options, jsmntok_t const* tokens, int i,
+				     const uint8_t* json_chunk, cgltf_size mat_index, cgltf_data* out_data)
+{
+	CGLTF_CHECK_TOKTYPE(tokens[i], JSMN_OBJECT);
+	cgltf_material* material = &out_data->materials[mat_index];
+
+	memset(material, 0, sizeof(cgltf_material));
+	material->emissive_texture.texture = (void*)-1;
+	material->emissive_texture.scale = 1.0f;
+
+	material->normal_texture.texture = (void*)-1;
+	material->normal_texture.scale = 1.0f;
+
+	material->occlusion_texture.texture = (void*)-1;
+	material->occlusion_texture.scale = 1.0f;
+
+	material->pbr.base_color_texture.texture = (void*)-1;
+	material->pbr.base_color_texture.scale = 1.0f;
+
+	material->pbr.metallic_roughness_texture.texture = (void*)-1;
+	material->pbr.metallic_roughness_texture.scale = 1.0f;
+
+	int size = tokens[i].size;
+	++i;
+
+	for (int j = 0; j < size; ++j)
+	{
+		if (cgltf_json_strcmp(tokens+i, json_chunk, "name") == 0)
+		{
+			++i;
+			int strsize = tokens[i].end - tokens[i].start;
+			material->name = options->memory_alloc(options->memory_user_data, strsize + 1);
+			strncpy(material->name,
+				(const char*)json_chunk + tokens[i].start,
+				strsize);
+			material->name[strsize] = 0;
+			++i;
+		}
+		else if (cgltf_json_strcmp(tokens+i, json_chunk, "pbrMetallicRoughness") == 0) 
+		{
+			i = cgltf_parse_json_pbr(tokens, i+1, json_chunk, mat_index, out_data);
+		}
+		else if (cgltf_json_strcmp(tokens+i, json_chunk, "emissiveFactor") == 0) 
+		{
+			i = cgltf_parse_json_rgba(tokens, i + 1, json_chunk, 
+				&(material->emissive_color));
+		}
+		else if (cgltf_json_strcmp(tokens + i, json_chunk, "normalTexture") == 0)
+		{
+			i = cgltf_parse_json_texture_view(tokens, i + 1, json_chunk,
+				&(material->normal_texture));
+		}
+		else if (cgltf_json_strcmp(tokens + i, json_chunk, "emissiveTexture") == 0)
+		{
+			i = cgltf_parse_json_texture_view(tokens, i + 1, json_chunk,
+				&(material->emissive_texture));
+		}
+		else if (cgltf_json_strcmp(tokens + i, json_chunk, "occlusionTexture") == 0) 
+		{
+			i = cgltf_parse_json_texture_view(tokens, i + 1, json_chunk,
+				&(material->occlusion_texture));
+		}
+		else if (cgltf_json_strcmp(tokens + i, json_chunk, "doubleSided") == 0) 			
+		{
+			++i;
+			material->double_sided =
+				cgltf_json_to_bool(tokens + i, json_chunk);
+			++i;
+		}
+		else
+		{
+			i = cgltf_skip_json(tokens, i+1);
+		}
+	}
+
+	return i;
+}
+
+static int cgltf_parse_json_accessors(cgltf_options* options, jsmntok_t const* tokens, int i, const uint8_t* json_chunk, cgltf_data* out_data)
+{
+	CGLTF_CHECK_TOKTYPE(tokens[i], JSMN_ARRAY);
+	out_data->accessors_count = tokens[i].size;
+	out_data->accessors = options->memory_alloc(options->memory_user_data, sizeof(cgltf_accessor) * out_data->accessors_count);
+	++i;
+	for (cgltf_size j = 0 ; j < out_data->accessors_count; ++j)
+	{
+		i = cgltf_parse_json_accessor(tokens, i, json_chunk, j, out_data);
+		if (i < 0)
+		{
+			return i;
+		}
+	}
+	return i;
+}
+
+static int cgltf_parse_json_materials(cgltf_options* options, jsmntok_t const* tokens, int i, const uint8_t* json_chunk, cgltf_data* out_data)
+{
+	CGLTF_CHECK_TOKTYPE(tokens[i], JSMN_ARRAY);
+	out_data->materials_count = tokens[i].size;
+	out_data->materials = options->memory_alloc(options->memory_user_data, sizeof(cgltf_material) * out_data->materials_count);
+	++i;
+	for (cgltf_size j = 0; j < out_data->materials_count; ++j)
+	{
+		i = cgltf_parse_json_material(options, tokens, i, json_chunk, j, out_data);
+		if (i < 0)
+		{
+			return i;
+		}
+	}
+	return i;
+}
+
+static int cgltf_parse_json_images(cgltf_options* options, jsmntok_t const* tokens, int i, const uint8_t* json_chunk, cgltf_data* out_data) {
+	CGLTF_CHECK_TOKTYPE(tokens[i], JSMN_ARRAY);
+	out_data->images_count = tokens[i].size;
+	out_data->images = options->memory_alloc(options->memory_user_data, sizeof(cgltf_image) * out_data->images_count);
+	++i;
+
+	for (cgltf_size j = 0; j < out_data->images_count; ++j) {
+		i = cgltf_parse_json_image(options, tokens, i, json_chunk, j, out_data);
+		if (i < 0) {
+			return i;
+		}
+	}
+	return i;
+}
+
+static int cgltf_parse_json_textures(cgltf_options* options, jsmntok_t const* tokens, int i, const uint8_t* json_chunk, cgltf_data* out_data) {
+	CGLTF_CHECK_TOKTYPE(tokens[i], JSMN_ARRAY);
+	out_data->textures_count = tokens[i].size;
+	out_data->textures = options->memory_alloc(options->memory_user_data, sizeof(cgltf_texture) * out_data->textures_count);
+	++i;
+
+	for (cgltf_size j = 0; j < out_data->textures_count; ++j) {
+		i = cgltf_parse_json_texture(options, tokens, i, json_chunk, j, out_data);
+		if (i < 0) {
+			return i;
+		}
+	}
+	return i;
+}
+
+static int cgltf_parse_json_samplers(cgltf_options* options, jsmntok_t const* tokens, int i, const uint8_t* json_chunk, cgltf_data* out_data) {
+	CGLTF_CHECK_TOKTYPE(tokens[i], JSMN_ARRAY);
+	out_data->samplers_count = tokens[i].size;
+	out_data->samplers = options->memory_alloc(options->memory_user_data, sizeof(cgltf_sampler) * out_data->samplers_count);
+	++i;
+
+	for (cgltf_size j = 0; j < out_data->samplers_count; ++j) {
+		i = cgltf_parse_json_sampler(options, tokens, i, json_chunk, j, out_data);
+		if (i < 0) {
+			return i;
+		}
+	}
+	return i;
+}
+
+static int cgltf_parse_json_buffer_view(jsmntok_t const* tokens, int i,
+					const uint8_t* json_chunk, cgltf_size buffer_view_index,
+					cgltf_data* out_data)
+{
+	CGLTF_CHECK_TOKTYPE(tokens[i], JSMN_OBJECT);
+
+	int size = tokens[i].size;
+	++i;
+
+	memset(&out_data->buffer_views[buffer_view_index], 0, sizeof(cgltf_buffer_view));
+
+	for (int j = 0; j < size; ++j)
+	{
+		if (cgltf_json_strcmp(tokens+i, json_chunk, "buffer") == 0)
+		{
+			++i;
+			out_data->buffer_views[buffer_view_index].buffer =
+					(void*)(size_t)cgltf_json_to_int(tokens+i, json_chunk);
+			++i;
+		}
+		else if (cgltf_json_strcmp(tokens+i, json_chunk, "byteOffset") == 0)
+		{
+			++i;
+			out_data->buffer_views[buffer_view_index].offset =
+					cgltf_json_to_int(tokens+i, json_chunk);
+			++i;
+		}
+		else if (cgltf_json_strcmp(tokens+i, json_chunk, "byteLength") == 0)
+		{
+			++i;
+			out_data->buffer_views[buffer_view_index].size =
+					cgltf_json_to_int(tokens+i, json_chunk);
+			++i;
+		}
+		else if (cgltf_json_strcmp(tokens+i, json_chunk, "byteStride") == 0)
+		{
+			++i;
+			out_data->buffer_views[buffer_view_index].stride =
+					cgltf_json_to_int(tokens+i, json_chunk);
+			++i;
+		}
+		else if (cgltf_json_strcmp(tokens+i, json_chunk, "target") == 0)
+		{
+			++i;
+			int type = cgltf_json_to_int(tokens+i, json_chunk);
+			switch (type)
+			{
+			case 34962:
+				type = cgltf_buffer_view_type_vertices;
+				break;
+			case 34963:
+				type = cgltf_buffer_view_type_indices;
+				break;
+			default:
+				type = cgltf_buffer_view_type_invalid;
+				break;
+			}
+			out_data->buffer_views[buffer_view_index].type = type;
+			++i;
+		}
+		else
+		{
+			i = cgltf_skip_json(tokens, i+1);
+		}
+	}
+
+	return i;
+}
+
+static int cgltf_parse_json_buffer_views(cgltf_options* options, jsmntok_t const* tokens, int i, const uint8_t* json_chunk, cgltf_data* out_data)
+{
+	CGLTF_CHECK_TOKTYPE(tokens[i], JSMN_ARRAY);
+	out_data->buffer_views_count = tokens[i].size;
+	out_data->buffer_views = options->memory_alloc(options->memory_user_data, sizeof(cgltf_buffer_view) * out_data->buffer_views_count);
+	++i;
+	for (cgltf_size j = 0 ; j < out_data->buffer_views_count; ++j)
+	{
+		i = cgltf_parse_json_buffer_view(tokens, i, json_chunk, j, out_data);
+		if (i < 0)
+		{
+			return i;
+		}
+	}
+	return i;
+}
+
+static int cgltf_parse_json_buffer(cgltf_options* options, jsmntok_t const* tokens, int i,
+				   const uint8_t* json_chunk, cgltf_size buffer_index,
+				   cgltf_data* out_data)
+{
+	CGLTF_CHECK_TOKTYPE(tokens[i], JSMN_OBJECT);
+
+	out_data->buffers[buffer_index].uri = NULL;
+
+	int size = tokens[i].size;
+	++i;
+
+	for (int j = 0; j < size; ++j)
+	{
+		if (cgltf_json_strcmp(tokens+i, json_chunk, "byteLength") == 0)
+		{
+			++i;
+			out_data->buffers[buffer_index].size =
+					cgltf_json_to_int(tokens+i, json_chunk);
+			++i;
+		}
+		else if (cgltf_json_strcmp(tokens+i, json_chunk, "uri") == 0)
+		{
+			++i;
+			int strsize = tokens[i].end - tokens[i].start;
+			out_data->buffers[buffer_index].uri = options->memory_alloc(options->memory_user_data, strsize + 1);
+			strncpy(out_data->buffers[buffer_index].uri,
+				(const char*)json_chunk + tokens[i].start,
+				strsize);
+			out_data->buffers[buffer_index].uri[strsize] = 0;
+			++i;
+		}
+		else
+		{
+			i = cgltf_skip_json(tokens, i+1);
+		}
+	}
+
+	return i;
+}
+
+static int cgltf_parse_json_buffers(cgltf_options* options, jsmntok_t const* tokens, int i, const uint8_t* json_chunk, cgltf_data* out_data)
+{
+	CGLTF_CHECK_TOKTYPE(tokens[i], JSMN_ARRAY);
+	out_data->buffers_count = tokens[i].size;
+	out_data->buffers = options->memory_alloc(options->memory_user_data, sizeof(cgltf_buffer) * out_data->buffers_count);
+	++i;
+	for (cgltf_size j = 0 ; j < out_data->buffers_count; ++j)
+	{
+		i = cgltf_parse_json_buffer(options, tokens, i, json_chunk, j, out_data);
+		if (i < 0)
+		{
+			return i;
+		}
+	}
+	return i;
+}
+
+static cgltf_size cgltf_calc_size(cgltf_type type, cgltf_component_type component_type)
+{
+	cgltf_type size = 0;
+
+	switch (component_type)
+	{
+	case cgltf_component_type_rgb_32f:
+		size = 12;
+		break;
+	case cgltf_component_type_rgba_32f:
+		size = 16;
+		break;
+	case cgltf_component_type_rg_32f:
+		size = 8;
+		break;
+	case cgltf_component_type_rg_8:
+		size = 2;
+		break;
+	case cgltf_component_type_rg_16:
+		size = 4;
+		break;
+	case cgltf_component_type_rgba_8:
+		size = 4;
+		break;
+	case cgltf_component_type_rgba_16:
+		size = 8;
+		break;
+	case cgltf_component_type_r_8:
+	case cgltf_component_type_r_8u:
+		size = 1;
+		break;
+	case cgltf_component_type_r_16:
+	case cgltf_component_type_r_16u:
+		size = 2;
+		break;
+	case cgltf_component_type_r_32u:
+	case cgltf_component_type_r_32f:
+		size = 4;
+		break;
+	case cgltf_component_type_invalid:
+	default:
+		size = 0;
+		break;
+	}
+
+	switch (type)
+	{
+	case cgltf_type_vec2:
+		size *= 2;
+		break;
+	case cgltf_type_vec3:
+		size *= 3;
+		break;
+	case cgltf_type_vec4:
+		size *= 4;
+		break;
+	case cgltf_type_mat2:
+		size *= 4;
+		break;
+	case cgltf_type_mat3:
+		size *= 9;
+		break;
+	case cgltf_type_mat4:
+		size *= 16;
+		break;
+	case cgltf_type_invalid:
+	case cgltf_type_scalar:
+	default:
+		size *= 1;
+		break;
+	}
+
+	return size;
+}
+
+cgltf_result cgltf_parse_json(cgltf_options* options, const uint8_t* json_chunk, cgltf_size size, cgltf_data* out_data)
+{
+	jsmn_parser parser = {0};
+
+	if (options->json_token_count == 0)
+	{
+		options->json_token_count = jsmn_parse(&parser, (const char*)json_chunk, size, NULL, 0);
+	}
+
+	jsmntok_t* tokens = options->memory_alloc(options->memory_user_data, sizeof(jsmntok_t) * options->json_token_count);
+
+	jsmn_init(&parser);
+
+	int token_count = jsmn_parse(&parser, (const char*)json_chunk, size, tokens, options->json_token_count);
+
+	if (token_count < 0
+			|| tokens[0].type != JSMN_OBJECT)
+	{
+		return cgltf_result_invalid_json;
+	}
+
+	// The root is an object.
+
+	for (int i = 1; i < token_count; )
+	{
+		jsmntok_t const* tok = &tokens[i];
+		if (tok->type == JSMN_STRING
+				&& i + 1 < token_count)
+		{
+			int const name_length = tok->end - tok->start;
+			if (name_length == 6
+					&& strncmp((const char*)json_chunk + tok->start, "meshes", 6) == 0)
+			{
+				i = cgltf_parse_json_meshes(options, tokens, i+1, json_chunk, out_data);
+			}
+			else if (name_length == 9
+				 && strncmp((const char*)json_chunk + tok->start, "accessors", 9) == 0)
+			{
+				i = cgltf_parse_json_accessors(options, tokens, i+1, json_chunk, out_data);
+			}
+			else if (name_length == 11
+				 && strncmp((const char*)json_chunk + tok->start, "bufferViews", 11) == 0)
+			{
+				i = cgltf_parse_json_buffer_views(options, tokens, i+1, json_chunk, out_data);
+			}
+			else if (name_length == 7
+				 && strncmp((const char*)json_chunk + tok->start, "buffers", 7) == 0)
+			{
+				i = cgltf_parse_json_buffers(options, tokens, i+1, json_chunk, out_data);
+			}
+			else if (name_length == 9
+				&& strncmp((const char*)json_chunk + tok->start, "materials", 9) == 0) 		
+			{
+				i = cgltf_parse_json_materials(options, tokens, i+1, json_chunk, out_data);
+			}
+			else if (name_length == 6
+				&& strncmp((const char*)json_chunk + tok->start, "images", 6) == 0) 
+			{
+				i = cgltf_parse_json_images(options, tokens, i + 1, json_chunk, out_data);
+			}
+			else if (name_length == 8
+				&& strncmp((const char*)json_chunk + tok->start, "textures", 8) == 0) 
+			{
+				i = cgltf_parse_json_textures(options, tokens, i + 1, json_chunk, out_data);
+			}
+			else if (name_length == 8
+				&& strncmp((const char*)json_chunk + tok->start, "samplers", 8) == 0)
+			{
+				i = cgltf_parse_json_samplers(options, tokens, i + 1, json_chunk, out_data);
+			}
+			else
+			{
+				i = cgltf_skip_json(tokens, i+1);
+			}
+
+			if (i < 0)
+			{
+				return cgltf_result_invalid_json;
+			}
+		}
+	}
+
+	options->memory_free(options->memory_user_data, tokens);
+
+	/* Fix up pointers */
+	for (cgltf_size i = 0; i < out_data->meshes_count; ++i)
+	{
+		for (cgltf_size j = 0; j < out_data->meshes[i].primitives_count; ++j)
+		{
+			if (out_data->meshes[i].primitives[j].indices ==(void*)-1)
+			{
+				out_data->meshes[i].primitives[j].indices = NULL;
+			}
+			else
+			{
+				out_data->meshes[i].primitives[j].indices
+						= &out_data->accessors[(cgltf_size)out_data->meshes[i].primitives[j].indices];
+			}
+
+			for (cgltf_size k = 0; k < out_data->meshes[i].primitives[j].attributes_count; ++k)
+			{
+				out_data->meshes[i].primitives[j].attributes[k].data
+						= &out_data->accessors[(cgltf_size)out_data->meshes[i].primitives[j].attributes[k].data];
+			}
+		}
+	}
+
+	for (cgltf_size i = 0; i < out_data->accessors_count; ++i)
+	{
+		if (out_data->accessors[i].buffer_view == (void*)-1)
+		{
+			out_data->accessors[i].buffer_view = NULL;
+		}
+		else
+		{
+			out_data->accessors[i].buffer_view
+					= &out_data->buffer_views[(cgltf_size)out_data->accessors[i].buffer_view];
+			out_data->accessors[i].stride = 0;
+			if (out_data->accessors[i].buffer_view)
+			{
+				out_data->accessors[i].stride = out_data->accessors[i].buffer_view->stride;
+			}
+		}
+		if (out_data->accessors[i].stride == 0)
+		{
+			out_data->accessors[i].stride = cgltf_calc_size(out_data->accessors[i].type, out_data->accessors[i].component_type);
+		}
+	}
+
+	for (cgltf_size i = 0; i < out_data->textures_count; ++i) 
+	{
+		if (out_data->textures[i].image == (void*)-1) 
+		{
+			out_data->textures[i].image = NULL;
+		}
+		else
+		{
+			out_data->textures[i].image = 
+				&out_data->images[(cgltf_size)out_data->textures[i].image];
+		}
+
+		if (out_data->textures[i].sampler == (void*)-1)
+		{
+			out_data->textures[i].sampler = NULL;
+		}
+		else 
+		{
+			out_data->textures[i].sampler =
+				&out_data->samplers[(cgltf_size)out_data->textures[i].sampler];
+		}
+	}
+
+	for (cgltf_size i = 0; i < out_data->images_count; ++i)
+	{
+		if (out_data->images[i].buffer_view == (void*)-1)
+		{
+			out_data->images[i].buffer_view = NULL;
+		}
+		else
+		{
+			out_data->images[i].buffer_view
+					= &out_data->buffer_views[(cgltf_size)out_data->images[i].buffer_view];
+		}
+	}
+
+	for (cgltf_size i = 0; i < out_data->materials_count; ++i)
+	{
+		if (out_data->materials[i].emissive_texture.texture == (void*)-1)
+		{
+			out_data->materials[i].emissive_texture.texture = NULL;
+		}
+		else
+		{
+			out_data->materials[i].emissive_texture.texture =
+				&out_data->textures[(cgltf_size)out_data->materials[i].emissive_texture.texture];
+		}
+
+		if (out_data->materials[i].normal_texture.texture == (void*)-1)
+		{
+			out_data->materials[i].normal_texture.texture = NULL;
+		}
+		else 
+		{
+			out_data->materials[i].normal_texture.texture =
+				&out_data->textures[(cgltf_size)out_data->materials[i].normal_texture.texture];
+		}
+
+		if (out_data->materials[i].occlusion_texture.texture == (void*)-1)
+		{
+			out_data->materials[i].occlusion_texture.texture = NULL;
+		}
+		else
+		{
+			out_data->materials[i].occlusion_texture.texture =
+				&out_data->textures[(cgltf_size)out_data->materials[i].occlusion_texture.texture];
+		}
+
+		if (out_data->materials[i].pbr.base_color_texture.texture == (void*)-1)
+		{
+			out_data->materials[i].pbr.base_color_texture.texture = NULL;
+		}
+		else
+		{
+			out_data->materials[i].pbr.base_color_texture.texture =
+				&out_data->textures[(cgltf_size)out_data->materials[i].pbr.base_color_texture.texture];
+		}
+
+		if (out_data->materials[i].pbr.metallic_roughness_texture.texture == (void*)-1)
+		{
+			out_data->materials[i].pbr.metallic_roughness_texture.texture = NULL;
+		}
+		else 
+		{
+			out_data->materials[i].pbr.metallic_roughness_texture.texture =
+				&out_data->textures[(cgltf_size)out_data->materials[i].pbr.metallic_roughness_texture.texture];
+		}
+	}
+
+	for (cgltf_size i = 0; i < out_data->buffer_views_count; ++i)
+	{
+		out_data->buffer_views[i].buffer
+				= &out_data->buffers[(cgltf_size)out_data->buffer_views[i].buffer];
+	}
+
+	return cgltf_result_success;
+}
+
+/*
+ * -- jsmn.c start --
+ * Source: https://github.com/zserge/jsmn
+ * License: MIT
+ */
+/**
+ * Allocates a fresh unused token from the token pull.
+ */
+static jsmntok_t *jsmn_alloc_token(jsmn_parser *parser,
+				   jsmntok_t *tokens, size_t num_tokens) {
+	jsmntok_t *tok;
+	if (parser->toknext >= num_tokens) {
+		return NULL;
+	}
+	tok = &tokens[parser->toknext++];
+	tok->start = tok->end = -1;
+	tok->size = 0;
+#ifdef JSMN_PARENT_LINKS
+	tok->parent = -1;
+#endif
+	return tok;
+}
+
+/**
+ * Fills token type and boundaries.
+ */
+static void jsmn_fill_token(jsmntok_t *token, jsmntype_t type,
+			    int start, int end) {
+	token->type = type;
+	token->start = start;
+	token->end = end;
+	token->size = 0;
+}
+
+/**
+ * Fills next available token with JSON primitive.
+ */
+static int jsmn_parse_primitive(jsmn_parser *parser, const char *js,
+				size_t len, jsmntok_t *tokens, size_t num_tokens) {
+	jsmntok_t *token;
+	int start;
+
+	start = parser->pos;
+
+	for (; parser->pos < len && js[parser->pos] != '\0'; parser->pos++) {
+		switch (js[parser->pos]) {
+#ifndef JSMN_STRICT
+		/* In strict mode primitive must be followed by "," or "}" or "]" */
+		case ':':
+#endif
+		case '\t' : case '\r' : case '\n' : case ' ' :
+		case ','  : case ']'  : case '}' :
+			goto found;
+		}
+		if (js[parser->pos] < 32 || js[parser->pos] >= 127) {
+			parser->pos = start;
+			return JSMN_ERROR_INVAL;
+		}
+	}
+#ifdef JSMN_STRICT
+	/* In strict mode primitive must be followed by a comma/object/array */
+	parser->pos = start;
+	return JSMN_ERROR_PART;
+#endif
+
+found:
+	if (tokens == NULL) {
+		parser->pos--;
+		return 0;
+	}
+	token = jsmn_alloc_token(parser, tokens, num_tokens);
+	if (token == NULL) {
+		parser->pos = start;
+		return JSMN_ERROR_NOMEM;
+	}
+	jsmn_fill_token(token, JSMN_PRIMITIVE, start, parser->pos);
+#ifdef JSMN_PARENT_LINKS
+	token->parent = parser->toksuper;
+#endif
+	parser->pos--;
+	return 0;
+}
+
+/**
+ * Fills next token with JSON string.
+ */
+static int jsmn_parse_string(jsmn_parser *parser, const char *js,
+			     size_t len, jsmntok_t *tokens, size_t num_tokens) {
+	jsmntok_t *token;
+
+	int start = parser->pos;
+
+	parser->pos++;
+
+	/* Skip starting quote */
+	for (; parser->pos < len && js[parser->pos] != '\0'; parser->pos++) {
+		char c = js[parser->pos];
+
+		/* Quote: end of string */
+		if (c == '\"') {
+			if (tokens == NULL) {
+				return 0;
+			}
+			token = jsmn_alloc_token(parser, tokens, num_tokens);
+			if (token == NULL) {
+				parser->pos = start;
+				return JSMN_ERROR_NOMEM;
+			}
+			jsmn_fill_token(token, JSMN_STRING, start+1, parser->pos);
+#ifdef JSMN_PARENT_LINKS
+			token->parent = parser->toksuper;
+#endif
+			return 0;
+		}
+
+		/* Backslash: Quoted symbol expected */
+		if (c == '\\' && parser->pos + 1 < len) {
+			int i;
+			parser->pos++;
+			switch (js[parser->pos]) {
+			/* Allowed escaped symbols */
+			case '\"': case '/' : case '\\' : case 'b' :
+			case 'f' : case 'r' : case 'n'  : case 't' :
+				break;
+				/* Allows escaped symbol \uXXXX */
+			case 'u':
+				parser->pos++;
+				for(i = 0; i < 4 && parser->pos < len && js[parser->pos] != '\0'; i++) {
+					/* If it isn't a hex character we have an error */
+					if(!((js[parser->pos] >= 48 && js[parser->pos] <= 57) || /* 0-9 */
+					     (js[parser->pos] >= 65 && js[parser->pos] <= 70) || /* A-F */
+					     (js[parser->pos] >= 97 && js[parser->pos] <= 102))) { /* a-f */
+						parser->pos = start;
+						return JSMN_ERROR_INVAL;
+					}
+					parser->pos++;
+				}
+				parser->pos--;
+				break;
+				/* Unexpected symbol */
+			default:
+				parser->pos = start;
+				return JSMN_ERROR_INVAL;
+			}
+		}
+	}
+	parser->pos = start;
+	return JSMN_ERROR_PART;
+}
+
+/**
+ * Parse JSON string and fill tokens.
+ */
+int jsmn_parse(jsmn_parser *parser, const char *js, size_t len,
+	       jsmntok_t *tokens, unsigned int num_tokens) {
+	int r;
+	int i;
+	jsmntok_t *token;
+	int count = parser->toknext;
+
+	for (; parser->pos < len && js[parser->pos] != '\0'; parser->pos++) {
+		char c;
+		jsmntype_t type;
+
+		c = js[parser->pos];
+		switch (c) {
+		case '{': case '[':
+			count++;
+			if (tokens == NULL) {
+				break;
+			}
+			token = jsmn_alloc_token(parser, tokens, num_tokens);
+			if (token == NULL)
+				return JSMN_ERROR_NOMEM;
+			if (parser->toksuper != -1) {
+				tokens[parser->toksuper].size++;
+#ifdef JSMN_PARENT_LINKS
+				token->parent = parser->toksuper;
+#endif
+			}
+			token->type = (c == '{' ? JSMN_OBJECT : JSMN_ARRAY);
+			token->start = parser->pos;
+			parser->toksuper = parser->toknext - 1;
+			break;
+		case '}': case ']':
+			if (tokens == NULL)
+				break;
+			type = (c == '}' ? JSMN_OBJECT : JSMN_ARRAY);
+#ifdef JSMN_PARENT_LINKS
+			if (parser->toknext < 1) {
+				return JSMN_ERROR_INVAL;
+			}
+			token = &tokens[parser->toknext - 1];
+			for (;;) {
+				if (token->start != -1 && token->end == -1) {
+					if (token->type != type) {
+						return JSMN_ERROR_INVAL;
+					}
+					token->end = parser->pos + 1;
+					parser->toksuper = token->parent;
+					break;
+				}
+				if (token->parent == -1) {
+					if(token->type != type || parser->toksuper == -1) {
+						return JSMN_ERROR_INVAL;
+					}
+					break;
+				}
+				token = &tokens[token->parent];
+			}
+#else
+			for (i = parser->toknext - 1; i >= 0; i--) {
+				token = &tokens[i];
+				if (token->start != -1 && token->end == -1) {
+					if (token->type != type) {
+						return JSMN_ERROR_INVAL;
+					}
+					parser->toksuper = -1;
+					token->end = parser->pos + 1;
+					break;
+				}
+			}
+			/* Error if unmatched closing bracket */
+			if (i == -1) return JSMN_ERROR_INVAL;
+			for (; i >= 0; i--) {
+				token = &tokens[i];
+				if (token->start != -1 && token->end == -1) {
+					parser->toksuper = i;
+					break;
+				}
+			}
+#endif
+			break;
+		case '\"':
+			r = jsmn_parse_string(parser, js, len, tokens, num_tokens);
+			if (r < 0) return r;
+			count++;
+			if (parser->toksuper != -1 && tokens != NULL)
+				tokens[parser->toksuper].size++;
+			break;
+		case '\t' : case '\r' : case '\n' : case ' ':
+			break;
+		case ':':
+			parser->toksuper = parser->toknext - 1;
+			break;
+		case ',':
+			if (tokens != NULL && parser->toksuper != -1 &&
+					tokens[parser->toksuper].type != JSMN_ARRAY &&
+					tokens[parser->toksuper].type != JSMN_OBJECT) {
+#ifdef JSMN_PARENT_LINKS
+				parser->toksuper = tokens[parser->toksuper].parent;
+#else
+				for (i = parser->toknext - 1; i >= 0; i--) {
+					if (tokens[i].type == JSMN_ARRAY || tokens[i].type == JSMN_OBJECT) {
+						if (tokens[i].start != -1 && tokens[i].end == -1) {
+							parser->toksuper = i;
+							break;
+						}
+					}
+				}
+#endif
+			}
+			break;
+#ifdef JSMN_STRICT
+			/* In strict mode primitives are: numbers and booleans */
+		case '-': case '0': case '1' : case '2': case '3' : case '4':
+		case '5': case '6': case '7' : case '8': case '9':
+		case 't': case 'f': case 'n' :
+			/* And they must not be keys of the object */
+			if (tokens != NULL && parser->toksuper != -1) {
+				jsmntok_t *t = &tokens[parser->toksuper];
+				if (t->type == JSMN_OBJECT ||
+						(t->type == JSMN_STRING && t->size != 0)) {
+					return JSMN_ERROR_INVAL;
+				}
+			}
+#else
+			/* In non-strict mode every unquoted value is a primitive */
+		default:
+#endif
+			r = jsmn_parse_primitive(parser, js, len, tokens, num_tokens);
+			if (r < 0) return r;
+			count++;
+			if (parser->toksuper != -1 && tokens != NULL)
+				tokens[parser->toksuper].size++;
+			break;
+
+#ifdef JSMN_STRICT
+			/* Unexpected char in strict mode */
+		default:
+			return JSMN_ERROR_INVAL;
+#endif
+		}
+	}
+
+	if (tokens != NULL) {
+		for (i = parser->toknext - 1; i >= 0; i--) {
+			/* Unmatched opened object or array */
+			if (tokens[i].start != -1 && tokens[i].end == -1) {
+				return JSMN_ERROR_PART;
+			}
+		}
+	}
+
+	return count;
+}
+
+/**
+ * Creates a new parser based over a given  buffer with an array of tokens
+ * available.
+ */
+void jsmn_init(jsmn_parser *parser) {
+	parser->pos = 0;
+	parser->toknext = 0;
+	parser->toksuper = -1;
+}
+/*
+ * -- jsmn.c end --
+ */
+
+#endif /* #ifdef CGLTF_IMPLEMENTATION */
+
+#ifdef __cplusplus
+}
+#endif