v/cmd/tools/vgret.v

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V

// 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.
//
// vgret (V Graphics REgression Tool) aids in generating screenshots of various graphical `gg`
// based V applications, in a structured directory hierarchy, with the intent of either:
// * Generate a directory structure of screenshots/images to test against
// (which, as an example, could later be pushed to a remote git repository)
// * Test for *visual* differences between two, structurally equal, directories
//
// vgret uses features and applications that is currently only available on Linux based distros:
// idiff : `sudo apt install openimageio-tools` to programmatically find *visual* differences between two images.
//
// For developers:
// For a quick overview of the generated images you can use `montage` from imagemagick to generate a "Contact Sheet":
// montage -verbose -label '%f' -font Helvetica -pointsize 10 -background '#000000' -fill 'gray' -define jpeg:size=200x200 -geometry 200x200+2+2 -auto-orient $(fd -t f . /path/to/vgret/out/dir) /tmp/montage.jpg
//
// To generate the reference images locally - or for uploading to a remote repo like `gg-regression-images`
// You can do the following:
// 1. `export DISPLAY=:99` # Start all graphical apps on DISPLAY 99
// 2. `Xvfb $DISPLAY -screen 0 1280x1024x24 &` # Starts a virtual X11 screen buffer
// 3. `v gret -v /tmp/gg-regression-images` # Generate reference images to /tmp/gg-regression-images
// 4. `v gret -v /tmp/test /tmp/gg-regression-images` # Test if the tests can pass locally by comparing to a fresh imageset
// 5. Visually check the images (you can get an overview by running the `montage` command above)
// 6. Upload to GitHub or keep locally for more testing/tweaking
//
// It's a known factor that the images generated on a local machine won't match the images generated on a remote machine by 100%.
// They will most likely differ by a small percentage - the comparison tool can be tweaked to accept these subtle changes,
// at the expense of slightly more inaccurate test results. For non-animated apps the percentage should be > 0.01.
// You can emulate or test these inaccuracies to some extend locally by simply running the test from a terminal using
// your physical X11 session display (Usually DISPLAY=:0).
//
// Read more about the options of `idiff` here: https://openimageio.readthedocs.io/en/latest/idiff.html
//
import os
import flag
const (
tool_name = os.file_name(os.executable())
tool_version = '0.0.1'
tool_description = '\n Dump and/or compare rendered frames of `gg` based apps
Examples:
Generate screenshots to `/tmp/test`
v gret /tmp/test
Generate and compare screenshots in `/tmp/src` to existing screenshots in `/tmp/dst`
v gret /tmp/src /tmp/dst
Compare screenshots in `/tmp/src` to existing screenshots in `/tmp/dst`
v gret --compare-only /tmp/src /tmp/dst
'
tmp_dir = os.join_path(os.temp_dir(), 'v', tool_name)
runtime_os = os.user_os()
v_root = os.real_path(@VMODROOT)
build_list = [
//'examples/snek/snek.v' // Inacurrate captures
'examples/game_of_life/life_gg.v'
//'examples/tetris/tetris.v' // Uses random start tile
//'examples/fireworks/fireworks.v' // Uses rand for placement
'examples/gg/bezier.v',
'examples/gg/mandelbrot.v',
'examples/gg/rectangles.v',
//'examples/gg/set_pixels.v' // Has problem in CI software render (blank, no pixels set)
//'examples/gg/random.v' // Always random
//'examples/gg/stars.v' // Uses rand for placement
'examples/gg/raven_text_rendering.v',
'examples/gg/worker_thread.v',
'examples/gg/polygons.v',
'examples/gg/bezier_anim.v',
'examples/gg/drag_n_drop.v'
//'examples/clock/clock.v' // Can only be tested on exact points in time :)
//'examples/hot_reload/bounce.v' // Inacurrate captures
//'examples/hot_reload/graph.v' // Inacurrate captures
//'examples/flappylearning/game.v' // Random movement
//'examples/2048/2048.v' // Random start tiles
'examples/ttf_font/example_ttf.v',
//'examples/sokol/01_cubes/cube.v', // Can pass with a warning and diff at around 1.2%
//'examples/sokol/02_cubes_glsl/cube_glsl.v', // Inacurrate captures
//'examples/sokol/03_march_tracing_glsl/rt_glsl.v', // Inacurrate captures
//'examples/sokol/04_multi_shader_glsl/rt_glsl.v', // Inacurrate captures
//'examples/sokol/05_instancing_glsl/rt_glsl.v', // Inacurrate captures
//'examples/sokol/06_obj_viewer/show_obj.v', // Inacurrate captures
]
)
const (
supported_hosts = ['linux']
// External tool executables
v_exe = vexe()
idiff_exe = os.find_abs_path_of_executable('idiff') or { '' }
)
struct Options {
show_help bool
verbose bool
compare_only bool
}
fn main() {
if os.args.len == 1 {
println('Usage: $tool_name PATH \n$tool_description\n$tool_name -h for more help...')
exit(1)
}
mut fp := flag.new_flag_parser(os.args[1..])
fp.application(tool_name)
fp.version(tool_version)
fp.description(tool_description)
fp.arguments_description('PATH [PATH]')
fp.skip_executable()
// Collect tool options
opt := Options{
show_help: fp.bool('help', `h`, false, 'Show this help text.')
verbose: fp.bool('verbose', `v`, false, "Be verbose about the tool's progress.")
compare_only: fp.bool('compare-only', `c`, false, "Don't generate screenshots - only compare input directories")
}
if opt.show_help {
println(fp.usage())
exit(0)
}
ensure_env(opt) or { panic(err) }
arg_paths := fp.finalize() or { panic(err) }
if arg_paths.len == 0 {
println(fp.usage())
println('Error missing arguments')
exit(1)
}
if arg_paths.len == 1 {
generate_screenshots(opt, v_root, arg_paths[0]) ?
} else if arg_paths.len > 1 {
compare_screenshots(opt, v_root, arg_paths[0], arg_paths[1]) or { panic(err) }
}
}
fn generate_screenshots(opt Options, base_path string, output_path string) ?[]string {
mut path := os.real_path(base_path)
path = path.trim_right('/')
dst_path := output_path.trim_right('/')
if !os.is_dir(path) {
return error('`$path` is not a directory')
}
mut screenshots := []string{}
for file in build_list {
app_path := os.join_path(path, file).trim_right('/')
mut rel_out_path := ''
if os.is_file(app_path) {
rel_out_path = os.dir(file.trim_right('/'))
} else {
rel_out_path = file.trim_right('/')
}
if opt.verbose {
eprintln('Compiling shaders (if needed) for `$file`')
}
sh_result := os.execute('$v_exe shader "$app_path"')
if sh_result.exit_code != 0 {
if opt.verbose {
eprintln('Skipping shader compile for `$file` v shader failed with:\n$sh_result.output')
}
continue
}
if !os.exists(dst_path) {
if opt.verbose {
eprintln('Creating output path `$dst_path`')
}
os.mkdir_all(dst_path) ?
}
screenshot_path := os.join_path(dst_path, rel_out_path)
if !os.exists(screenshot_path) {
os.mkdir_all(screenshot_path) or {
return error('Failed making screenshot path `$screenshot_path`')
}
}
screenshots << take_screenshots(opt, app_path, screenshot_path) or {
return error('Failed taking screenshot of `$app_path`:\n$err.msg')
}
}
return screenshots
}
fn compare_screenshots(opt Options, base_path string, output_path string, target_path string) ? {
if idiff_exe == '' {
return error('$tool_name need the `idiff` tool installed. It can be installed on Ubuntu with `sudo apt install openimageio-tools`')
}
mut path := os.real_path(base_path)
path = path.trim_right('/')
if !os.is_dir(path) {
return error('`$path` is not a directory')
}
if !os.is_dir(target_path) {
return error('`$target_path` is not a directory')
}
if path == target_path {
return error('Compare paths can not be the same directory `$path`')
}
screenshots := generate_screenshots(opt, path, output_path) ?
if opt.verbose {
eprintln('Comparing $screenshots.len screenshots in `$output_path` with `$target_path`')
}
mut fails := map[string]string{}
mut warns := map[string]string{}
for screenshot in screenshots {
relative_screenshot := screenshot.all_after(output_path + os.path_separator)
src := screenshot
target := os.join_path(target_path, relative_screenshot)
if opt.verbose {
eprintln('Comparing `$src` with `$target`')
}
diff_file := os.join_path(os.temp_dir(), os.file_name(src).all_before_last('.') +
'.diff.tif')
diff_cmd := '$idiff_exe -p -fail 0.001 -failpercent 0.2 -od -o "$diff_file" -abs "$src" "$target"'
result := os.execute(diff_cmd)
if opt.verbose && result.exit_code == 0 {
eprintln('Running: $diff_cmd')
eprintln('$result.output')
}
if result.exit_code != 0 {
eprintln('$result.output')
if result.exit_code == 1 {
warns[src] = target
} else {
fails[src] = target
}
}
}
if warns.len > 0 {
eprintln('--- WARNINGS ---')
eprintln('The following files had warnings when compared to their targets')
for warn_src, warn_target in warns {
eprintln('$warn_src ~= $warn_target')
}
}
if fails.len > 0 {
eprintln('--- ERRORS ---')
eprintln('The following files did not match their targets')
for fail_src, fail_target in fails {
eprintln('$fail_src != $fail_target')
}
first := fails.keys()[0]
fail_copy := os.join_path(os.temp_dir(), 'fail.' + first.all_after_last('.'))
os.cp(first, fail_copy) or { panic(err) }
eprintln('First failed file `$first` is copied to `$fail_copy`')
diff_file := os.join_path(os.temp_dir(), os.file_name(first).all_before_last('.') +
'.diff.tif')
diff_copy := os.join_path(os.temp_dir(), 'diff.tif')
os.cp(diff_file, diff_copy) or { panic(err) }
eprintln('First failed diff file `$diff_file` is copied to `$diff_copy`')
exit(1)
}
}
fn take_screenshots(opt Options, app string, out_path string) ?[]string {
if !opt.compare_only {
if opt.verbose {
eprintln('Taking screenshot(s) of `$app` to `$out_path`')
}
os.setenv('VGG_STOP_AT_FRAME', '8', true)
os.setenv('VGG_SCREENSHOT_FOLDER', out_path, true)
os.setenv('VGG_SCREENSHOT_FRAMES', '5', true)
result := os.execute('$v_exe -d gg_record run "$app"')
if result.exit_code != 0 {
return error('Failed taking screenshot of `$app`:\n$result.output')
}
}
mut screenshots := []string{}
shots := os.ls(out_path) or { return error('Failed listing dir `$out_path`') }
for shot in shots {
if shot.starts_with(os.file_name(app).all_before_last('.')) {
screenshots << os.join_path(out_path, shot)
}
}
return screenshots
}
// ensure_env returns nothing if everything is okay.
fn ensure_env(opt Options) ? {
if !os.exists(tmp_dir) {
os.mkdir_all(tmp_dir) ?
}
if runtime_os !in supported_hosts {
return error('$tool_name is currently only supported on $supported_hosts hosts')
}
}
// vexe returns the absolute path to the V compiler.
fn vexe() string {
mut exe := os.getenv('VEXE')
if os.is_executable(exe) {
return os.real_path(exe)
}
possible_symlink := os.find_abs_path_of_executable('v') or { '' }
if os.is_executable(possible_symlink) {
exe = os.real_path(possible_symlink)
}
return exe
}