diff --git a/.gitignore b/.gitignore
index 5a58160..de46c10 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,4 +1,5 @@
 .gdb_history
 *.spv
 *.o
-main
\ No newline at end of file
+main
+*.pack
\ No newline at end of file
diff --git a/Makefile b/Makefile
index 46ed02f..8bdfd35 100644
--- a/Makefile
+++ b/Makefile
@@ -1,6 +1,7 @@
 CC=$(PREFIX)gcc
 CXX=$(PREFIX)g++
 OBJCOPY=$(PREFIX)objcopy
+AS=$(PREFIX)as
 
 OBJARCH = elf64-x86-64
 
@@ -30,44 +31,24 @@ endif
 
 OBJS = \
 	src/main.o \
-	src/volk/volk.o
-
-BINS = \
-	index.idx.o \
-	position_normal_texture.vtx.o \
-	sprite.data.o
-
-SHADERS = \
-	shader/triangle.vs.spv.o \
-	shader/triangle.ps.spv.o
+	src/volk/volk.o \
+	src/file.o \
+	src/pack.o
 
 LIBS = \
 	 ../SDL3-dist/lib64/libSDL3.a
 
 all: main
 
-define BUILD_BINARY_O
-	$(OBJCOPY) -I binary -O $(OBJARCH) $< $@
-endef
-
-%.vtx.o: %.vtx
-	$(BUILD_BINARY_O)
-
-%.idx.o: %.idx
-	$(BUILD_BINARY_O)
-
-%.spv.o: %.spv
-	$(BUILD_BINARY_O)
-
-%.data.o: %.data
-	$(BUILD_BINARY_O)
-
 %.o: %.c
 	$(CC) $(ARCH) $(CSTD) $(CFLAGS) $(FLAGS) $(OPT) $(DEBUG) -c $< -o $@
 
 %.o: %.cpp
 	$(CXX) $(ARCH) $(CXXSTD) $(CFLAGS) $(FLAGS) $(OPT) $(DEBUG) -c $< -o $@
 
+%.o: %.s
+	$(AS) $< -o $@
+
 main: $(OBJS) $(LIBS) $(BINS) $(SHADERS)
 	$(CC) $(ARCH) $(LDFLAGS) $(FLAGS) $(OPT) $(DEBUG) $^ -o $@
 
@@ -77,6 +58,13 @@ main: $(OBJS) $(LIBS) $(BINS) $(SHADERS)
 %.ps.spv: %.hlsl
 	../dxc/bin/dxc -spirv -T ps_6_1 -E PSMain -fspv-target-env=vulkan1.3 $< -Fo $@
 
+tool/pack_file: tool/pack_file.cpp
+	make -C tool pack_file
+
+PACK_FILENAMES = $(shell cat filenames.txt)
+files.pack: tool/pack_file $(PACK_FILENAMES) filenames.txt
+	./tool/pack_file $@ $(PACK_FILENAMES)
+
 .SUFFIXES:
 .INTERMEDIATE:
 .SECONDARY:
diff --git a/filenames.txt b/filenames.txt
new file mode 100644
index 0000000..75a1c2d
--- /dev/null
+++ b/filenames.txt
@@ -0,0 +1,5 @@
+shader/triangle.vs.spv
+shader/triangle.ps.spv
+index.idx
+position_normal_texture.vtx
+sprite.data
diff --git a/include/file.h b/include/file.h
new file mode 100644
index 0000000..e9fda03
--- /dev/null
+++ b/include/file.h
@@ -0,0 +1,5 @@
+#pragma once
+
+namespace file {
+  void const * open(const char * r_filename, uint32_t * out_size);
+}
diff --git a/include/pack.h b/include/pack.h
new file mode 100644
index 0000000..9c96fb6
--- /dev/null
+++ b/include/pack.h
@@ -0,0 +1,19 @@
+#include <stdint.h>
+
+namespace pack {
+  struct file_entry {
+    char filename[128];
+    uint32_t offset;
+    uint32_t size;
+  };
+
+  struct header {
+    uint32_t magic;
+    uint32_t header_size;
+    uint32_t entry_count;
+    file_entry entry[0];
+  };
+  static_assert((sizeof (header)) == 12);
+
+  const uint32_t magic_value = 0x037c2dc0;
+}
diff --git a/src/file.cpp b/src/file.cpp
new file mode 100644
index 0000000..2f14cbb
--- /dev/null
+++ b/src/file.cpp
@@ -0,0 +1,39 @@
+#include <stdio.h>
+#include <stdint.h>
+#include <stdlib.h>
+#include <stddef.h>
+#include <string.h>
+
+#include "pack.h"
+#include "file.h"
+
+extern "C" {
+  extern uint8_t const _files_pack_start[];
+  extern uint8_t const _files_pack_end[];
+};
+
+namespace file {
+
+  void const * open(const char * r_filename, uint32_t * out_size)
+  {
+    fprintf(stderr, "(pack) filename: %s\n", r_filename);
+
+    pack::header const * header = (pack::header const *)&_files_pack_start[0];
+    if (header->magic != pack::magic_value) {
+      fprintf(stderr, "invalid header magic: %08x expected magic value: %08x\n", header->magic, pack::magic_value);
+      exit(EXIT_FAILURE);
+    }
+    ptrdiff_t data = (ptrdiff_t)&_files_pack_start[header->header_size];
+
+    for (unsigned int i = 0; i < header->entry_count; i++) {
+      if (strcmp(header->entry[i].filename, r_filename) == 0) {
+        *out_size = header->entry[i].size;
+        return (void const *)(data + header->entry[i].offset);
+      }
+    }
+
+    fprintf(stderr, "filename not found in pack file %s\n", r_filename);
+    exit(EXIT_FAILURE);
+  }
+
+}
diff --git a/src/main.cpp b/src/main.cpp
index fa5fb78..fa624e3 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -8,34 +8,7 @@
 #include "directxmath/directxmath.h"
 
 #include "new.h"
-
-extern "C" {
-  extern uint8_t const _binary_position_normal_texture_vtx_start[];
-  extern void * const _binary_position_normal_texture_vtx_size;
-  extern uint8_t const _binary_index_idx_start[];
-  extern void * const _binary_index_idx_size;
-
-  extern uint8_t const _binary_shader_triangle_vs_spv_start[];
-  extern void * const _binary_shader_triangle_vs_spv_size;
-  extern uint8_t const _binary_shader_triangle_ps_spv_start[];
-  extern void * const _binary_shader_triangle_ps_spv_size;
-
-  extern uint8_t const _binary_sprite_data_start[];
-  extern void * const _binary_sprite_data_size;
-}
-
-#define vtx_start _binary_position_normal_texture_vtx_start
-#define vtx_size (size_t)(&_binary_position_normal_texture_vtx_size)
-#define idx_start _binary_index_idx_start
-#define idx_size (size_t)(&_binary_index_idx_size)
-
-#define vs_start _binary_shader_triangle_vs_spv_start
-#define vs_size (size_t)(&_binary_shader_triangle_vs_spv_size)
-#define ps_start _binary_shader_triangle_ps_spv_start
-#define ps_size (size_t)(&_binary_shader_triangle_ps_spv_size)
-
-#define sprite_start _binary_sprite_data_start
-#define sprite_size (size_t)(&_binary_sprite_data_size)
+#include "file.h"
 
 #define SDL_CHECK(f) \
   { \
@@ -512,8 +485,13 @@ int main()
   // mesh
   //////////////////////////////////////////////////////////////////////
 
-  VkDeviceSize vtxBufferSize{ vtx_size };
-  VkDeviceSize idxBufferSize{ idx_size };
+  uint32_t vertexSize;
+  void const * vertexStart = file::open("position_normal_texture.vtx", &vertexSize);
+  uint32_t indexSize;
+  void const * indexStart = file::open("index.idx", &indexSize);
+
+  VkDeviceSize vtxBufferSize{ vertexSize };
+  VkDeviceSize idxBufferSize{ indexSize };
   VkBufferCreateInfo vertexIndexBufferCreateInfo{
     .sType = VK_STRUCTURE_TYPE_BUFFER_CREATE_INFO,
     .size = vtxBufferSize + idxBufferSize,
@@ -538,8 +516,8 @@ int main()
 
   void * vertexIndexMappedData;
   VK_CHECK(vkMapMemory(device, vertexIndexBufferMemory, 0, vertexIndexBufferCreateInfo.size, 0, &vertexIndexMappedData));
-  memcpy((void *)(((ptrdiff_t)vertexIndexMappedData) + 0), vtx_start, vtx_size);
-  memcpy((void *)(((ptrdiff_t)vertexIndexMappedData) + vtx_size), idx_start, idx_size);
+  memcpy((void *)(((ptrdiff_t)vertexIndexMappedData) + 0), vertexStart, vertexSize);
+  memcpy((void *)(((ptrdiff_t)vertexIndexMappedData) + vertexSize), indexStart, indexSize);
   vkUnmapMemory(device, vertexIndexBufferMemory);
 
   //////////////////////////////////////////////////////////////////////
@@ -673,10 +651,13 @@ int main()
 
   // texture transfer: source buffer
 
+  uint32_t spriteSize;
+  void const * spriteStart = file::open("sprite.data", &spriteSize);
+
   VkBuffer textureSourceBuffer{};
   VkBufferCreateInfo textureSourceBufferCreateInfo{
     .sType = VK_STRUCTURE_TYPE_BUFFER_CREATE_INFO,
-    .size = sprite_size,
+    .size = spriteSize,
     .usage = VK_BUFFER_USAGE_TRANSFER_SRC_BIT
   };
   VK_CHECK(vkCreateBuffer(device, &textureSourceBufferCreateInfo, nullptr, &textureSourceBuffer));
@@ -697,7 +678,7 @@ int main()
 
   void * textureSourceMappedData;
   VK_CHECK(vkMapMemory(device, textureSourceBufferMemory, 0, textureSourceBufferCreateInfo.size, 0, &textureSourceMappedData));
-  memcpy((void *)(((ptrdiff_t)textureSourceMappedData) + 0), sprite_start, sprite_size);
+  memcpy((void *)(((ptrdiff_t)textureSourceMappedData) + 0), spriteStart, spriteSize);
   vkUnmapMemory(device, textureSourceBufferMemory);
 
   VkFenceCreateInfo textureFenceCreateInfo{
@@ -872,18 +853,23 @@ int main()
   // shaders
   //////////////////////////////////////////////////////////////////////
 
+  uint32_t triangleVSSize;
+  void const * triangleVSStart = file::open("shader/triangle.vs.spv", &triangleVSSize);
+  uint32_t trianglePSSize;
+  void const * trianglePSStart = file::open("shader/triangle.ps.spv", &trianglePSSize);
+
   VkShaderModuleCreateInfo vertexShaderModuleCreateInfo{
     .sType = VK_STRUCTURE_TYPE_SHADER_MODULE_CREATE_INFO,
-    .codeSize = vs_size,
-    .pCode = (uint32_t *)vs_start
+    .codeSize = triangleVSSize,
+    .pCode = (uint32_t *)triangleVSStart
   };
   VkShaderModule vertexShaderModule{};
   VK_CHECK(vkCreateShaderModule(device, &vertexShaderModuleCreateInfo, nullptr, &vertexShaderModule));
 
   VkShaderModuleCreateInfo pixelShaderModuleCreateInfo{
     .sType = VK_STRUCTURE_TYPE_SHADER_MODULE_CREATE_INFO,
-    .codeSize = ps_size,
-    .pCode = (uint32_t *)ps_start
+    .codeSize = trianglePSSize,
+    .pCode = (uint32_t *)trianglePSStart
   };
   VkShaderModule pixelShaderModule{};
   VK_CHECK(vkCreateShaderModule(device, &pixelShaderModuleCreateInfo, nullptr, &pixelShaderModule));
diff --git a/src/pack.s b/src/pack.s
new file mode 100644
index 0000000..ef3403f
--- /dev/null
+++ b/src/pack.s
@@ -0,0 +1,5 @@
+        .global _files_pack_start
+        .global _files_pack_end
+_files_pack_start:
+        .incbin "files.pack"
+_files_pack_end:
diff --git a/tool/Makefile b/tool/Makefile
new file mode 100644
index 0000000..54f1ec5
--- /dev/null
+++ b/tool/Makefile
@@ -0,0 +1,5 @@
+OPT = -O2
+CFLAGS = -I../include
+
+pack_file: pack_file.cpp
+	g++ -o $@ $(OPT) $(CFLAGS) $^
diff --git a/tool/pack_file.cpp b/tool/pack_file.cpp
new file mode 100644
index 0000000..ecab6ea
--- /dev/null
+++ b/tool/pack_file.cpp
@@ -0,0 +1,112 @@
+#include <stdio.h>
+#include <string.h>
+#include <errno.h>
+#include <assert.h>
+#include <stdlib.h>
+
+#include "pack.h"
+
+static uint8_t copy_buffer[1024 * 1024];
+static int const copy_buffer_size = (sizeof (copy_buffer));
+
+void copy_file(FILE * output, FILE * input, size_t size)
+{
+  size_t written = 0;
+
+  while (true) {
+    size_t read_size = fread(copy_buffer, 1, copy_buffer_size, input);
+    if (read_size == 0)
+      break;
+
+    size_t write_size = fwrite(copy_buffer, 1, read_size, output);
+    assert(write_size == read_size);
+
+    written += write_size;
+
+    if (read_size < copy_buffer_size)
+      break;
+  }
+
+  assert(written == size);
+}
+
+FILE * file_size(const char * filename, uint32_t * out_size)
+{
+  FILE * f = fopen(filename, "rb");
+  if (f == nullptr) {
+    fprintf(stderr, "fopen(%s): %s\n", filename, strerror(errno));
+    return nullptr;
+  }
+
+  int fseek_end_ret = fseek(f, 0, SEEK_END);
+  if (fseek_end_ret < 0) {
+    fprintf(stderr, "fseek(%s, SEEK_END): %s\n", filename, strerror(errno));
+    return nullptr;
+  }
+
+  long size = ftell(f);
+  if (size < 0) {
+    fprintf(stderr, "ftell(%s): %s\n", filename, strerror(errno));
+    return nullptr;
+  }
+
+  int fseek_set_ret = fseek(f, 0, SEEK_SET);
+  if (fseek_set_ret < 0) {
+    fprintf(stderr, "fseek(%s, SEEK_SET): %s\n", filename, strerror(errno));
+    return nullptr;
+  }
+
+  *out_size = size;
+
+  return f;
+}
+
+int main(int argc, char const * argv[])
+{
+  assert(argc >= 3);
+
+  int files_count = argc - 2;
+  char const * output_filename = argv[1];
+  char const * const * filenames = &argv[2];
+  FILE * files[files_count];
+
+  int header_size = (sizeof (pack::header)) + (sizeof (pack::file_entry)) * files_count;
+  pack::header * header = (pack::header *)malloc(header_size);
+  memset(header, 0, header_size);
+
+  header->magic = pack::magic_value;
+  header->header_size = header_size;
+  header->entry_count = files_count;
+  int offset = 0;
+
+  for (int i = 0; i < files_count; i++) {
+    char const * filename = filenames[i];
+    uint32_t size;
+    FILE * file = file_size(filename, &size);
+    assert(file != nullptr);
+    files[i] = file;
+    int filename_length = strlen(filename);
+    assert(filename_length <= 127);
+    memcpy(header->entry[i].filename, filename, filename_length);
+    header->entry[i].offset = offset;
+    header->entry[i].size = size;
+    offset += size;
+  }
+
+  FILE * fout = fopen(output_filename, "wb");
+  if (fout == nullptr) {
+    fprintf(stderr, "fopen(%s): %s\n", output_filename, strerror(errno));
+    return EXIT_FAILURE;
+  }
+
+  fwrite((void *)header, 1, header_size, fout);
+
+  for (int i = 0; i < files_count; i++) {
+    copy_file(fout, files[i], header->entry[i].size);
+    int fclose_ret = fclose(files[i]);
+    assert(fclose_ret == 0);
+  }
+
+  int fclose_ret = fclose(fout);
+  assert(fclose_ret == 0);
+}