diff --git a/third_party/cgltf/README.md b/third_party/cgltf/README.md
index 06ef5e2da3..f8893ce529 100644
--- a/third_party/cgltf/README.md
+++ b/third_party/cgltf/README.md
@@ -105,6 +105,7 @@ cgltf also supports some glTF extensions:
 - KHR_materials_pbrSpecularGlossiness
 - KHR_materials_unlit
 - KHR_texture_transform
+- KHR_draco_mesh_compression (requires a library like [Google's Draco](https://github.com/google/draco) for decompression though)
 
 cgltf does **not** yet support unlisted extensions.
 
diff --git a/third_party/cgltf/cgltf.h b/third_party/cgltf/cgltf.h
index bbc641cf9c..18a2dd693c 100644
--- a/third_party/cgltf/cgltf.h
+++ b/third_party/cgltf/cgltf.h
@@ -385,6 +385,12 @@ typedef struct cgltf_morph_target {
 	cgltf_size attributes_count;
 } cgltf_morph_target;
 
+typedef struct cgltf_draco_mesh_compression {
+	cgltf_buffer_view* buffer_view;
+	cgltf_attribute* attributes;
+	cgltf_size attributes_count;
+} cgltf_draco_mesh_compression;
+
 typedef struct cgltf_primitive {
 	cgltf_primitive_type type;
 	cgltf_accessor* indices;
@@ -394,6 +400,8 @@ typedef struct cgltf_primitive {
 	cgltf_morph_target* targets;
 	cgltf_size targets_count;
 	cgltf_extras extras;
+	cgltf_bool has_draco_mesh_compression;
+	cgltf_draco_mesh_compression draco_mesh_compression;
 } cgltf_primitive;
 
 typedef struct cgltf_mesh {
@@ -632,8 +640,8 @@ cgltf_result cgltf_copy_extras_json(const cgltf_data* data, const cgltf_extras*
  *
  */
 
-#ifdef __INTELLISENSE__
-/* This makes MSVC intellisense work. */
+#if defined(__INTELLISENSE__) || defined(__JETBRAINS_IDE__)
+/* This makes MSVC/CLion intellisense work. */
 #define CGLTF_IMPLEMENTATION
 #endif
 
@@ -948,7 +956,6 @@ cgltf_result cgltf_parse_file(const cgltf_options* options, const char* path, cg
 		return cgltf_result_invalid_options;
 	}
 
-	void* (*memory_alloc)(void*, cgltf_size) = options->memory.alloc ? options->memory.alloc : &cgltf_default_alloc;
 	void (*memory_free)(void*, void*) = options->memory.free ? options->memory.free : &cgltf_default_free;
 	cgltf_result (*file_read)(const struct cgltf_memory_options*, const struct cgltf_file_options*, const char*, cgltf_size*, void**) = options->file.read ? options->file.read : &cgltf_default_file_read;
 
@@ -995,7 +1002,6 @@ static void cgltf_combine_paths(char* path, const char* base, const char* uri)
 static cgltf_result cgltf_load_buffer_file(const cgltf_options* options, cgltf_size size, const char* uri, const char* gltf_path, void** out_data)
 {
 	void* (*memory_alloc)(void*, cgltf_size) = options->memory.alloc ? options->memory.alloc : &cgltf_default_alloc;
-	void (*memory_free)(void*, void*) = options->memory.free ? options->memory.free : &cgltf_default_free;
 	cgltf_result (*file_read)(const struct cgltf_memory_options*, const struct cgltf_file_options*, const char*, cgltf_size*, void**) = options->file.read ? options->file.read : &cgltf_default_file_read;
 
 	char* path = (char*)memory_alloc(options->memory.user_data, strlen(uri) + strlen(gltf_path) + 1);
@@ -1852,8 +1858,6 @@ static cgltf_uint cgltf_component_read_uint(const void* in, cgltf_component_type
 		default:
 			return 0;
 	}
-
-	return 0;
 }
 
 static cgltf_bool cgltf_element_read_uint(const uint8_t* element, cgltf_type type, cgltf_component_type component_type, cgltf_uint* out, cgltf_size element_size)
@@ -2173,6 +2177,32 @@ static int cgltf_parse_json_extras(jsmntok_t const* tokens, int i, const uint8_t
 	return i;
 }
 
+static int cgltf_parse_json_draco_mesh_compression(cgltf_options* options, jsmntok_t const* tokens, int i, const uint8_t* json_chunk, cgltf_draco_mesh_compression* out_draco_mesh_compression)
+{
+	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, "attributes") == 0)
+		{
+			i = cgltf_parse_json_attribute_list(options, tokens, i + 1, json_chunk, &out_draco_mesh_compression->attributes, &out_draco_mesh_compression->attributes_count);
+		}
+		else if (cgltf_json_strcmp(tokens + i, json_chunk, "bufferView") == 0)
+		{
+			++i;
+			out_draco_mesh_compression->buffer_view = CGLTF_PTRINDEX(cgltf_buffer_view, cgltf_json_to_int(tokens + i, json_chunk));
+			++i;
+		}
+	}
+
+	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);
@@ -2231,6 +2261,35 @@ static int cgltf_parse_json_primitive(cgltf_options* options, jsmntok_t const* t
 		{
 			i = cgltf_parse_json_extras(tokens, i + 1, json_chunk, &out_prim->extras);
 		}
+		else if (cgltf_json_strcmp(tokens + i, json_chunk, "extensions") == 0)
+		{
+			++i;
+
+			CGLTF_CHECK_TOKTYPE(tokens[i], JSMN_OBJECT);
+
+			int extensions_size = tokens[i].size;
+			++i;
+
+			for (int k = 0; k < extensions_size; ++k)
+			{
+				CGLTF_CHECK_KEY(tokens[i]);
+
+				if (cgltf_json_strcmp(tokens+i, json_chunk, "KHR_draco_mesh_compression") == 0)
+				{
+					out_prim->has_draco_mesh_compression = 1;
+					i = cgltf_parse_json_draco_mesh_compression(options, tokens, i + 1, json_chunk, &out_prim->draco_mesh_compression);
+				}
+				else
+				{
+					i = cgltf_skip_json(tokens, i+1);
+				}
+
+				if (i < 0)
+				{
+					return i;
+				}
+			}
+		}
 		else
 		{
 			i = cgltf_skip_json(tokens, i+1);
@@ -4585,6 +4644,14 @@ static int cgltf_fixup_pointers(cgltf_data* data)
 					CGLTF_PTRFIXUP_REQ(data->meshes[i].primitives[j].targets[k].attributes[m].data, data->accessors, data->accessors_count);
 				}
 			}
+
+			if (data->meshes[i].primitives[j].has_draco_mesh_compression) {
+				CGLTF_PTRFIXUP_REQ(data->meshes[i].primitives[j].draco_mesh_compression.buffer_view, data->buffer_views, data->buffer_views_count);
+				for (cgltf_size m = 0; m < data->meshes[i].primitives[j].draco_mesh_compression.attributes_count; ++m)
+				{
+					CGLTF_PTRFIXUP_REQ(data->meshes[i].primitives[j].draco_mesh_compression.attributes[m].data, data->accessors, data->accessors_count);
+				}
+			}
 		}
 	}
 
diff --git a/third_party/cgltf/cgltf_write.h b/third_party/cgltf/cgltf_write.h
index ce90bcd86c..77914a7943 100644
--- a/third_party/cgltf/cgltf_write.h
+++ b/third_party/cgltf/cgltf_write.h
@@ -57,9 +57,9 @@ cgltf_size cgltf_write(const cgltf_options* options, char* buffer, cgltf_size si
  *
  */
 
-#ifdef __INTELLISENSE__
-/* This makes MSVC intellisense work. */
-#define CGLTF_WRITE_IMPLEMENTATION
+#if defined(__INTELLISENSE__) || defined(__JETBRAINS_IDE__)
+/* This makes MSVC/CLion intellisense work. */
+#define CGLTF_IMPLEMENTATION
 #endif
 
 #ifdef CGLTF_WRITE_IMPLEMENTATION
@@ -69,10 +69,11 @@ cgltf_size cgltf_write(const cgltf_options* options, char* buffer, cgltf_size si
 #include <stdlib.h>
 #include <string.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_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)
 
 typedef struct {
 	char* buffer;
@@ -86,6 +87,7 @@ typedef struct {
 	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)
@@ -405,6 +407,31 @@ static void cgltf_write_primitive(cgltf_write_context* context, const cgltf_prim
 		cgltf_write_line(context, "]");
 	}
 	cgltf_write_extras(context, &prim->extras);
+
+	cgltf_bool has_extensions = prim->has_draco_mesh_compression;
+	if (has_extensions) {
+		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, "}");
+		}
+
+		cgltf_write_line(context, "}");
+	}
 }
 
 static void cgltf_write_mesh(cgltf_write_context* context, const cgltf_mesh* mesh)
@@ -836,6 +863,25 @@ cgltf_result cgltf_write_file(const cgltf_options* options, const char* path, co
 	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");
+	}
+}
+
 cgltf_size cgltf_write(const cgltf_options* options, char* buffer, cgltf_size size, const cgltf_data* data)
 {
 	(void)options;
@@ -850,6 +896,7 @@ cgltf_size cgltf_write(const cgltf_options* options, char* buffer, cgltf_size si
 	ctx.indent = "  ";
 	ctx.needs_comma = 0;
 	ctx.extension_flags = 0;
+	ctx.required_extension_flags = 0;
 
 	cgltf_write_context* context = &ctx;
 
@@ -1007,18 +1054,13 @@ cgltf_size cgltf_write(const cgltf_options* options, char* buffer, cgltf_size si
 
 	if (context->extension_flags != 0) {
 		cgltf_write_line(context, "\"extensionsUsed\": [");
-		if (context->extension_flags & CGLTF_EXTENSION_FLAG_TEXTURE_TRANSFORM) {
-			cgltf_write_stritem(context, "KHR_texture_transform");
-		}
-		if (context->extension_flags & CGLTF_EXTENSION_FLAG_MATERIALS_UNLIT) {
-			cgltf_write_stritem(context, "KHR_materials_unlit");
-		}
-		if (context->extension_flags & CGLTF_EXTENSION_FLAG_SPECULAR_GLOSSINESS) {
-			cgltf_write_stritem(context, "KHR_materials_pbrSpecularGlossiness");
-		}
-		if (context->extension_flags & CGLTF_EXTENSION_FLAG_LIGHTS_PUNCTUAL) {
-			cgltf_write_stritem(context, "KHR_lights_punctual");
-		}
+		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, "]");
 	}
 
diff --git a/third_party/cgltf/test/CMakeLists.txt b/third_party/cgltf/test/CMakeLists.txt
index 805221402e..a017aa71d3 100644
--- a/third_party/cgltf/test/CMakeLists.txt
+++ b/third_party/cgltf/test/CMakeLists.txt
@@ -5,19 +5,43 @@ include_directories( ${CMAKE_CURRENT_SOURCE_DIR} )
 set( EXE_NAME cgltf_test )
 add_executable( ${EXE_NAME} main.c )
 set_property( TARGET ${EXE_NAME} PROPERTY C_STANDARD 99 )
+if(MSVC)
+    target_compile_options(${EXE_NAME} PRIVATE /W4 /WX)
+    add_definitions( -D_CRT_SECURE_NO_WARNINGS)
+else()
+    target_compile_options(${EXE_NAME} PRIVATE -Wall -Wextra -pedantic -Werror)
+endif()
 install( TARGETS ${EXE_NAME} RUNTIME DESTINATION bin )
 
 set( EXE_NAME test_conversion )
 add_executable( ${EXE_NAME} test_conversion.cpp )
 set_property( TARGET ${EXE_NAME} PROPERTY CXX_STANDARD 11 )
+if(MSVC)
+    target_compile_options(${EXE_NAME} PRIVATE /W4 /WX)
+    add_definitions( -D_CRT_SECURE_NO_WARNINGS)
+else()
+    target_compile_options(${EXE_NAME} PRIVATE -Wall -Wextra -pedantic -Werror)
+endif()
 install( TARGETS ${EXE_NAME} RUNTIME DESTINATION bin )
 
 set( EXE_NAME test_write )
 add_executable( ${EXE_NAME} test_write.cpp )
 set_property( TARGET ${EXE_NAME} PROPERTY CXX_STANDARD 11 )
+if(MSVC)
+    target_compile_options(${EXE_NAME} PRIVATE /W4 /WX)
+    add_definitions( -D_CRT_SECURE_NO_WARNINGS)
+else()
+    target_compile_options(${EXE_NAME} PRIVATE -Wall -Wextra -pedantic -Werror)
+endif()
 install( TARGETS ${EXE_NAME} RUNTIME DESTINATION bin )
 
 set( EXE_NAME test_math )
 add_executable( ${EXE_NAME} test_math.cpp )
 set_property( TARGET ${EXE_NAME} PROPERTY CXX_STANDARD 11 )
+if(MSVC)
+    target_compile_options(${EXE_NAME} PRIVATE /W4 /WX)
+    add_definitions( -D_CRT_SECURE_NO_WARNINGS)
+else()
+    target_compile_options(${EXE_NAME} PRIVATE -Wall -Wextra -pedantic -Werror)
+endif()
 install( TARGETS ${EXE_NAME} RUNTIME DESTINATION bin )
diff --git a/third_party/cgltf/test/main.c b/third_party/cgltf/test/main.c
index a6050d6761..75543c19db 100644
--- a/third_party/cgltf/test/main.c
+++ b/third_party/cgltf/test/main.c
@@ -13,7 +13,8 @@ int main(int argc, char** argv)
 		return -1;
 	}
 
-	cgltf_options options = {0};
+	cgltf_options options;
+	memset(&options, 0, sizeof(cgltf_options));
 	cgltf_data* data = NULL;
 	cgltf_result result = cgltf_parse_file(&options, argv[1], &data);
 
@@ -28,7 +29,7 @@ int main(int argc, char** argv)
 	if (result == cgltf_result_success)
 	{
 		printf("Type: %u\n", data->file_type);
-		printf("Meshes: %lu\n", data->meshes_count);
+		printf("Meshes: %u\n", (unsigned)data->meshes_count);
 	}
 
 	cgltf_free(data);
diff --git a/third_party/cgltf/test/test_conversion.cpp b/third_party/cgltf/test/test_conversion.cpp
index 2566292e63..938a0ac83b 100644
--- a/third_party/cgltf/test/test_conversion.cpp
+++ b/third_party/cgltf/test/test_conversion.cpp
@@ -29,7 +29,7 @@ int main(int argc, char** argv)
 	if (result != cgltf_result_success || strstr(argv[1], "Draco"))
 		return result;
 
-	const cgltf_accessor* blobs = data->accessors;
+	//const cgltf_accessor* blobs = data->accessors;
 	cgltf_float element_float[16];
 	cgltf_uint element_uint[4];
 	for (cgltf_size blob_index = 0; blob_index < data->accessors_count; ++blob_index)
diff --git a/third_party/cgltf/test/test_math.cpp b/third_party/cgltf/test/test_math.cpp
index 6de608341c..84f93052a7 100644
--- a/third_party/cgltf/test/test_math.cpp
+++ b/third_party/cgltf/test/test_math.cpp
@@ -22,7 +22,7 @@ static void check(cgltf_float target[3], float x, float y, float z) {
     }
 }
 
-int main(int argc, char** argv)
+int main(int, char**)
 {
     cgltf_node node = {};