load("@rules_cc//cc:defs.bzl", "cc_binary")
load("@emsdk//emscripten_toolchain:wasm_rules.bzl", "wasm_cc_binary")

package(default_visibility = ["//:__subpackages__"])

BASE_LINKOPTS = [
    #"-flto",  # https://github.com/emscripten-core/emsdk/issues/807
    "--bind",  # Compiles the source code using the Embind bindings to connect C/C++ and JavaScript
    "--no-entry",
    "-sALLOW_MEMORY_GROWTH",
    "-sUSE_PTHREADS=0",  # Disable pthreads
    "-sMODULARIZE",
    "-sDISABLE_EXCEPTION_CATCHING",  # Disable all exception catching
    "-sNODEJS_CATCH_EXIT=0",  # We don't have a 'main' so disable exit() catching
    "-sWASM",
    "-sMAX_WEBGL_VERSION=2",
    "-sFORCE_FILESYSTEM=0",
    "-sFILESYSTEM=0",
]

RELEASE_OPTS = [
    # We disable closure for now, because we need a way to pass in the externs file,
    # which does not appear to be exposed on the emscripten toolchain.
    # "--closure 1",  # Run the closure compiler
    "-sASSERTIONS=0",  # Turn off assertions
]

DEBUG_OPTS = [
    "--closure 0",  # Do not use closure
    "-sASSERTIONS",  # Turn on assertions
    "-sGL_ASSERTIONS",
]

GM_OPTS = [
    "-sEXPORT_NAME=InitWasmGMTests",
    "--pre-js",
    "modules/canvaskit/gm.js",
]

filegroup(
    name = "hdrs",
    srcs = [
        "WasmCommon.h",
    ],
)

cc_binary(
    name = "gm-bindings",
    testonly = True,
    srcs = [
        "gm_bindings.cpp",
        ":hdrs",
        "//gm:gms",  # Required for the registry to work
        "//src/ports:default_global_init",
        "//src/ports:fontmgr",
        "//src/ports:malloc",
        "//src/ports:skdebug",
        "//src/ports:skia_image_generator",
    ],
    additional_linker_inputs = ["gm.js"],
    linkopts = select({
        "//bazel/common_config_settings:debug_build": BASE_LINKOPTS + GM_OPTS + DEBUG_OPTS,
        "//bazel/common_config_settings:release_build": BASE_LINKOPTS + GM_OPTS + RELEASE_OPTS,
        "//conditions:default": BASE_LINKOPTS + GM_OPTS + RELEASE_OPTS,
    }),
    local_defines = [
        "SK_GL",
        "SK_USE_WEBGL",
    ],
    # This target won't build successfully on its own because of missing emscripten
    # headers etc. Therefore, we hide it from wildcards.
    tags = ["manual"],
    deps = [
        "//:gms",
        "//:hash_and_encode",
        "//:tests",
    ],
)

wasm_cc_binary(
    name = "gm-bindings-wasm",
    testonly = True,
    cc_target = ":gm-bindings",
)

CK_DEFINES = [
    "SK_NO_FONTS",  #TODO(kjlubick)
    "SK_DISABLE_LEGACY_SHADERCONTEXT",
] + select({
    "//bazel/common_config_settings:gl_backend": [
        "SK_GL",
        "SK_SUPPORT_GPU=1",
    ],
    "//conditions:default": [
        "SK_SUPPORT_GPU=0",
    ],
})

CK_OPTS = BASE_LINKOPTS + [
    "-sEXPORT_NAME=CanvasKitInit",
    # The order of these --pre-js flags matters! The preamble is a partially open scope and the
    # postamble closes it.
    "--pre-js",
    "modules/canvaskit/preamble.js",
    "--pre-js",
    "modules/canvaskit/color.js",
    "--pre-js",
    "modules/canvaskit/memory.js",
    "--pre-js",
    "modules/canvaskit/util.js",
    "--pre-js",
    "modules/canvaskit/interface.js",
    "--pre-js",
    "modules/canvaskit/postamble.js",
    "-sINITIAL_MEMORY=128MB",
] + select({
    "//bazel/common_config_settings:gl_backend": [
        "--pre-js",
        "modules/canvaskit/cpu.js",
        "--pre-js",
        "modules/canvaskit/gpu.js",
    ],
    "//conditions:default": [
        "--pre-js",
        "modules/canvaskit/cpu.js",
    ],
}) + select({
    "//bazel/common_config_settings:debug_build": DEBUG_OPTS,
    "//conditions:default": RELEASE_OPTS,
})

cc_binary(
    name = "canvaskit",
    srcs = [
        "canvaskit_bindings.cpp",
        ":hdrs",
        "//src/ports:default_global_init",
        "//src/ports:fontmgr",
        "//src/ports:malloc",
        "//src/ports:skdebug",
        "//src/ports:skia_image_generator",
    ],
    additional_linker_inputs = [
        "color.js",
        "interface.js",
        "memory.js",
        "postamble.js",
        "preamble.js",
        "util.js",
    ],
    linkopts = CK_OPTS,
    local_defines = CK_DEFINES,
    # This target won't build successfully on its own because of missing emscripten
    # headers etc. Therefore, we hide it from wildcards.
    tags = ["manual"],
    deps = [
        "//:skia-core",
    ],
)

wasm_cc_binary(
    name = "canvaskit-wasm",
    cc_target = ":canvaskit",
)