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v/cmd/tools/vshader.v

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// Copyright (c) 2021 Lars Pontoppidan. All rights reserved.
// Use of this source code is governed by an MIT license
// that can be found in the LICENSE file.
//
// vshader aids in generating special shader code C headers via sokol-shdc's 'annotated GLSL' format to any
// supported target formats that sokol_gfx supports internally.
//
// vshader bootstraps itself by downloading it's own dependencies to a system cache directory on first run.
//
// Please see https://github.com/floooh/sokol-tools/blob/master/docs/sokol-shdc.md#feature-overview
// for a more in-depth overview of the specific tool in use.
//
// The shader language used is, as described on the overview page linked above, an 'annotated GLSL'
// and 'modern GLSL' (v450) shader language format.
import os
import io.util
import flag
import net.http
const (
tool_name = os.file_name(os.executable())
tool_version = '0.0.1'
tool_description = "Compile shaders in sokol's annotated GLSL format to C headers for use with sokol based apps"
cache_dir = os.join_path(os.cache_dir(), 'v', tool_name)
runtime_os = os.user_os()
)
const (
supported_hosts = ['linux', 'macos', 'windows']
supported_slangs = [
'glsl330', // desktop GL
'glsl100', // GLES2 / WebGL
'glsl300es', // GLES3 / WebGL2
'hlsl4', // D3D11
'hlsl5', // D3D11
'metal_macos', // Metal on macOS
'metal_ios', // Metal on iOS device
'metal_sim', // Metal on iOS simulator
'wgpu', // WebGPU
]
default_slangs = [
'glsl330',
'glsl100',
'glsl300es',
// 'hlsl4', and hlsl5 can't be used at the same time
'hlsl5',
'metal_macos',
'metal_ios',
'metal_sim',
'wgpu',
]
shdc_version = '33d2e4cc'
shdc_urls = {
'windows': 'https://github.com/floooh/sokol-tools-bin/raw/33d2e4cc26088c6c28eaef5467990f8940d15aab/bin/win32/sokol-shdc.exe'
'macos': 'https://github.com/floooh/sokol-tools-bin/raw/33d2e4cc26088c6c28eaef5467990f8940d15aab/bin/osx/sokol-shdc'
'linux': 'https://github.com/floooh/sokol-tools-bin/raw/33d2e4cc26088c6c28eaef5467990f8940d15aab/bin/linux/sokol-shdc'
}
shdc_version_file = os.join_path(cache_dir, 'sokol-shdc.version')
shdc = shdc_exe()
shdc_exe_name = 'sokol-shdc.exe'
)
struct Options {
show_help bool
verbose bool
force_update bool
slangs []string
}
struct CompileOptions {
verbose bool
slangs []string
invoke_path string
}
fn main() {
if os.args.len == 1 {
println('Usage: $tool_name PATH \n$tool_description\n$tool_name -h for more help...')
exit(1)
}
mut fp := flag.new_flag_parser(os.args[1..])
fp.application(tool_name)
fp.version(tool_version)
fp.description(tool_description)
fp.arguments_description('PATH [PATH]...')
fp.skip_executable()
// Collect tool options
opt := Options{
show_help: fp.bool('help', `h`, false, 'Show this help text.')
force_update: fp.bool('force-update', `u`, false, 'Force update of the sokol-shdc tool.')
verbose: fp.bool('verbose', `v`, false, 'Be verbose about the tools progress.')
slangs: fp.string_multi('slang', `l`, 'Shader dialects to generate code for. Default is all. Available: $supported_slangs')
}
if opt.show_help {
println(fp.usage())
exit(0)
}
ensure_external_tools(opt) or { panic(err) }
input_paths := fp.finalize() or { panic(err) }
for path in input_paths {
if os.exists(path) {
compile_shaders(opt, path) or { panic(err) }
}
}
}
// shader_program_name returns the name of the program from `shader_file`.
// shader_program_name returns a blank string if no @program entry could be found.
fn shader_program_name(shader_file string) string {
shader_program := os.read_lines(shader_file) or { return '' }
for line in shader_program {
if line.contains('@program ') {
return line.all_after('@program ').all_before(' ')
}
}
return ''
}
// validate_shader_file returns an error if `shader_file` isn't valid.
fn validate_shader_file(shader_file string) ? {
shader_program := os.read_lines(shader_file) or {
return error('shader program at "$shader_file" could not be opened for reading')
}
mut has_program_directive := false
for line in shader_program {
if line.contains('@program ') {
has_program_directive = true
break
}
}
if !has_program_directive {
return error('shader program at "$shader_file" is missing a "@program" directive.')
}
}
// compile_shaders compiles all `*.glsl` files found in `input_path`
// to their C header file representatives.
fn compile_shaders(opt Options, input_path string) ? {
mut path := os.real_path(input_path)
path = path.trim_right('/')
if os.is_file(path) {
path = os.dir(path)
}
mut shader_files := []string{}
collect(path, mut shader_files)
if shader_files.len == 0 {
if opt.verbose {
eprintln('$tool_name found no shader files to compile for "$path"')
}
return
}
for shader_file in shader_files {
// It could be the user has WIP shader files lying around not used,
// so we just report that there's something wrong
validate_shader_file(shader_file) or {
eprintln(err)
continue
}
co := CompileOptions{
verbose: opt.verbose
slangs: opt.slangs
invoke_path: path
}
// Currently sokol-shdc allows for multiple --input flags
// - but it's only the last entry that's actually compiled/used
// Given this fact - we can only compile one '.glsl' file to one C '.h' header
compile_shader(co, shader_file) ?
}
}
// compile_shader compiles `shader_file` to a C header file.
fn compile_shader(opt CompileOptions, shader_file string) ? {
path := opt.invoke_path
// The output convetion, for now, is to use the name of the .glsl file
mut out_file := os.file_name(shader_file).all_before_last('.') + '.h'
out_file = os.join_path(path, out_file)
mut slangs := opt.slangs.clone()
if opt.slangs.len == 0 {
slangs = default_slangs.clone()
}
header_name := os.file_name(out_file)
if opt.verbose {
eprintln('$tool_name generating shader code for $slangs in header "$header_name" in "$path" from $shader_file')
}
cmd := '$shdc --input "$shader_file" --output "$out_file" --slang "' + slangs.join(':') + '"'
if opt.verbose {
eprintln('$tool_name executing:\n$cmd')
}
res := os.execute(cmd)
if res.exit_code != 0 {
eprintln('$tool_name failed generating shader includes:\n $res.output\n $cmd')
exit(1)
}
if opt.verbose {
program_name := shader_program_name(shader_file)
eprintln('$tool_name usage example in V:\n\nimport sokol.gfx\n\n#include "$header_name"\n\nfn C.${program_name}_shader_desc(gfx.Backend) &C.sg_shader_desc\n')
}
}
// collect recursively collects `.glsl` file entries from `path` in `list`.
fn collect(path string, mut list []string) {
if !os.is_dir(path) {
return
}
mut files := os.ls(path) or { return }
for file in files {
p := os.join_path(path, file)
if os.is_dir(p) && !os.is_link(p) {
collect(p, mut list)
} else if os.exists(p) {
if os.file_ext(p) == '.glsl' {
list << os.real_path(p)
}
}
}
return
}
// ensure_external_tools returns nothing if the external
// tools can be setup or is already in place.
fn ensure_external_tools(opt Options) ? {
if !os.exists(cache_dir) {
os.mkdir_all(cache_dir) ?
}
if opt.force_update {
download_shdc(opt) ?
return
}
is_shdc_available := os.is_file(shdc)
is_shdc_executable := os.is_executable(shdc)
if is_shdc_available && is_shdc_executable {
if opt.verbose {
version := os.read_file(shdc_version_file) or { 'unknown' }
eprintln('$tool_name using sokol-shdc version $version at "$shdc"')
}
return
}
download_shdc(opt) ?
}
// shdc_exe returns an absolute path to the `sokol-shdc` tool.
// Please note that the tool isn't guaranteed to actually be present, nor is
// it guaranteed that it can be invoked.
fn shdc_exe() string {
return os.join_path(cache_dir, shdc_exe_name)
}
// download_shdc downloads the `sokol-shdc` tool to an OS specific cache directory.
fn download_shdc(opt Options) ? {
// We want to use the same, runtime, OS type as this tool is invoked on.
download_url := shdc_urls[runtime_os] or { '' }
if download_url == '' {
return error('$tool_name failed to download an external dependency "sokol-shdc" for ${runtime_os}.\nThe supported host platforms for shader compilation is $supported_hosts')
}
update_to_shdc_version := os.read_file(shdc_version_file) or { shdc_version }
file := shdc_exe()
if opt.verbose {
if shdc_version != update_to_shdc_version && os.exists(file) {
eprintln('$tool_name updating sokol-shdc to version $update_to_shdc_version ...')
} else {
eprintln('$tool_name installing sokol-shdc version $update_to_shdc_version ...')
}
}
if os.exists(file) {
os.rm(file) ?
}
mut dtmp_file, dtmp_path := util.temp_file(util.TempFileOptions{ path: os.dir(file) }) ?
dtmp_file.close()
if opt.verbose {
eprintln('$tool_name downloading sokol-shdc from $download_url')
}
http.download_file(download_url, dtmp_path) or {
os.rm(dtmp_path) ?
return error('$tool_name failed to download sokol-shdc needed for shader compiling: $err')
}
// Make it executable
os.chmod(dtmp_path, 0o775) ?
// Move downloaded file in place
os.mv(dtmp_path, file) ?
if runtime_os in ['linux', 'macos'] {
// Use the .exe file ending to minimize platform friction.
os.mv(file, shdc) ?
}
// Update internal version file
os.write_file(shdc_version_file, update_to_shdc_version) ?
}