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#!/usr/bin/env python3
"""Generate SPIR-V blob arrays as C++ inline file.
Install shaderc from https://github.com/google/shaderc/, and run:
./bin/gen-spirv-shader-arrays.py -d src/libixion/shaders -o src/libixion/vulkan_spirv_blobs.inl
"""
import argparse
import os
import shutil
import sys
import subprocess
import tempfile
from pathlib import Path
def _write_cpp_byte_array(array_name, bytes, file):
print("// This file has been auto-generated. DO NOT EDIT THIS FILE BY HAND!", file=file)
print(file=file)
print(f"uint8_t {array_name}_spirv[] = {{", file=file)
bytes_per_line = 8
for i, b in enumerate(bytes):
if i % bytes_per_line == 0:
print(" ", end="", file=file)
print(f"0x{b:02X}, ", end="", file=file)
if (i + 1) % bytes_per_line == 0:
print(file=file)
print(file=file)
print("};", file=file)
print(file=file)
def _scan_shader_dir(dirpath, output):
# Detect glslc command.
glslc_exec = shutil.which("glslc")
if not glslc_exec:
print("glslc command not found in your PATH.", file=sys.stderr)
sys.exit(1)
print(f"glslc command: {glslc_exec}")
temp = tempfile.NamedTemporaryFile(delete=False)
print(f"temp file name: {temp.name}")
for f in os.listdir(dirpath):
filepath = dirpath / f
if filepath.suffix != ".comp":
continue
print(f"parsing {filepath}")
cmd = [glslc_exec, filepath, "-o", temp.name]
subprocess.run(cmd)
spirv_file = Path(temp.name)
bs = spirv_file.read_bytes()
_write_cpp_byte_array(filepath.stem, bs, output)
os.unlink(temp.name)
def main():
parser = argparse.ArgumentParser(
description="Generate C++ inline file containing SPIR-V representations of GLSL shaders.")
parser.add_argument(
"--shader-dir", "-d", type=Path,
required=True,
help="Path to directory where glsl shader files are.")
parser.add_argument(
"--output", "-o", type=Path,
required=True,
help="Path to output C++ inline file.")
args = parser.parse_args()
with args.output.open(mode="w") as output:
_scan_shader_dir(args.shader_dir, output)
if __name__ == "__main__":
main()
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