project(
    'forge',
    'c',
    version : '0.1.0',
    license : 'GPL-3.0-only',
    meson_version: '>=0.54.0',
    default_options : [
        'warning_level=3',  # Enables -Wall, -Wextra, etc.
        'c_std=c11',
    ])

deps = [
    dependency('GL'),
    dependency('glew', version : '>=2.1.0'),
]

# https://mesonbuild.com/howtox.html#add-math-library-lm-portably
cc = meson.get_compiler('c')
deps += cc.find_library('m', required : false)

# Pre-compile GL 4.6 shaders to SPIR-V IR to be included directly in the binary.
glsl_validator = find_program('glslangValidator')
glsl_validator_args = ['-G', '-x']

optimization = get_option('optimization')

if get_option('debug') or optimization == 'g'
    glsl_validator_args += ['-g']
endif

if optimization != 'g'
    if optimization == 's'
        glsl_validator_args += ['-Os']
    elif optimization.to_int() == 0
        glsl_validator_args += ['-Od']
    endif
endif

spirv_gen = generator(
    glsl_validator,
    output : '@PLAINNAME@.spv',
    arguments : glsl_validator_args + ['-o', '@OUTPUT@', '@INPUT@'])

spirv_binary = spirv_gen.process(
    files([
        'shader/gui_rect.vert.glsl',
        'shader/gui_rect.frag.glsl'
    ]))

# Headers must be generated from inside include/forge for two reasons relating
# to custom_target behavior:
#
# 1. It is an error for output file names to have a path in its name.
# 2. Output files are placed in a directory layout in the private build tree
#    mirroring the source layout.
#
# We can then use include_directories as intended as it includes relative
# paths to both the source root *and* the private build root.
#
# Some helpful links:
#
# - https://github.com/mesonbuild/meson/issues/2320#issuecomment-774569905
# - https://mesonbuild.com/Reference-manual.html#include_directories
#
# Generated headers can thus be found in build/include/forge (assuming 'build'
# is your build directory).

# Declares:
# gen_headers:       list[custom_tgt]
subdir('include/forge')

includes = include_directories('include')

lib = library(
    meson.project_name(),
    files([
        'src/compare_float.c',
        'src/gui_basic.c',
        'src/gui_context.c',
        'src/gui_draw.c',
        'src/gui_graph.c',
        'src/gui_input.c',
        'src/gui_layout.c',
        'src/gui_opengl_46.c',
        'src/gui_util.c',
        'src/gui_window.c',
        'src/hash_table.c',
        'src/memory_pool.c',
        'src/murmur_hash.c',
        'src/pack_float.c',
        'src/pcg_basic.c',
        'src/random_double.c',
        'src/stb_sprintf.c',
    ]),
    gen_headers,
    spirv_binary,
    version : meson.project_version(),
    dependencies : deps,
    include_directories : includes,
    implicit_include_directories : false,
    install : true)

forge_dep = declare_dependency(
    sources : gen_headers,
    link_with : lib,
    version : meson.project_version(),
    dependencies : deps,
    include_directories : includes)

install_headers(
    files([
        'include/forge/allocator.h',
        'include/forge/collection.h',
        'include/forge/compare_float.h',
        'include/forge/compiler_attribute.h',
        'include/forge/expect.h',
        'include/forge/gui.h',
        'include/forge/gui_basic.h',
        'include/forge/gui_context.h',
        'include/forge/gui_draw.h',
        'include/forge/gui_graph.h',
        'include/forge/gui_input.h',
        'include/forge/gui_layout.h',
        'include/forge/gui_opengl_46.h',
        'include/forge/gui_type.h',
        'include/forge/gui_util.h',
        'include/forge/gui_window.h',
        'include/forge/hash_table.h',
        'include/forge/input.h',
        'include/forge/memory_pool.h',
        'include/forge/murmur_hash.h',
        'include/forge/pack_float.h',
        'include/forge/pcg_basic.h',
        'include/forge/random_double.h',
        'include/forge/stb_sprintf.h',
        'include/forge/stretchy_buffer.h',
    ]),
    subdir : meson.project_name())

pkgconfig = import('pkgconfig')
pkgconfig.generate(
    libraries : lib,
    name : lib.name(),
    version : meson.project_version(),
    filebase : meson.project_name(),
    description : 'Foundation library for Forge tools.',
    url : 'https://git.sr.ht/~rycwo/forge/')

subdir('test')