# Converts a SPIR-V binary to a C++ header with an embedded uint8_t array.
# cmake -DINPUT=<spv> -DOUTPUT=<h> -DVAR_NAME=<name> -P spv_to_header.cmake

if(NOT DEFINED INPUT OR NOT DEFINED OUTPUT OR NOT DEFINED VAR_NAME)
    message(FATAL_ERROR "Usage: -DINPUT=x.spv -DOUTPUT=x.h -DVAR_NAME=kname -P spv_to_header.cmake")
endif()

file(READ "${INPUT}" raw_hex HEX)
string(REGEX REPLACE "([0-9a-fA-F][0-9a-fA-F])" "0x\\1," hex_bytes "${raw_hex}")
string(REGEX REPLACE ",$" "" hex_bytes "${hex_bytes}")
string(LENGTH "${raw_hex}" hex_len)
math(EXPR byte_count "${hex_len} / 2")

file(WRITE "${OUTPUT}"
"#pragma once
#include <cstdint>
#include <cstddef>
static const uint8_t ${VAR_NAME}[] = { ${hex_bytes} };
static const size_t ${VAR_NAME}_size = ${byte_count};
")