cmake_minimum_required(VERSION 3.19)
project(websamples)

if (FILAMENT_SKIP_SAMPLES)
    return()
endif()

set(SERVER_DIR ${PROJECT_BINARY_DIR})
set(ROOT_DIR ${CMAKE_CURRENT_SOURCE_DIR}/../..)

if (CMAKE_CROSSCOMPILING)
    include(${IMPORT_EXECUTABLES})
endif()

# ==================================================================================================
# Build Materials.
# ==================================================================================================

set(MATERIAL_NAMES
    parquet
    sandbox
    textured
    nonlit)

set(MATC_FLAGS -a opengl -p mobile)
if (NOT CMAKE_BUILD_TYPE MATCHES Release)
    set(MATC_FLAGS -g ${MATC_FLAGS})
endif()

set(MATERIAL_BINS)
foreach (NAME ${MATERIAL_NAMES})
    set(mat_src "materials/${NAME}.mat")
    get_filename_component(localname "${mat_src}" NAME_WE)
    get_filename_component(fullname "${mat_src}" ABSOLUTE)
    set(output_bin "${SERVER_DIR}/${localname}.filamat")
    add_custom_command(
            OUTPUT ${output_bin}
            COMMAND matc ${MATC_FLAGS} -o ${output_bin} ${fullname}
            MAIN_DEPENDENCY ${mat_src}
            DEPENDS matc
            COMMENT "Compiling material ${mat_src} to ${output_path}")
    list(APPEND MATERIAL_BINS ${output_bin})
endforeach()

add_custom_target(sample_materials DEPENDS ${MATERIAL_BINS})

# ==================================================================================================
# Build Assets.
# ==================================================================================================

# Generate mipmapped KTX files from various PNG files using mipgen.
function(add_ktxfiles SOURCE TARGET EXTRA_ARGS)
    set(source_path "${ROOT_DIR}/${SOURCE}")
    set(target_path "${SERVER_DIR}/${TARGET}")
    set(target_textures ${target_textures} ${target_path} PARENT_SCOPE)
    add_custom_command(
        OUTPUT ${target_path}
        COMMAND mipgen --quiet --strip-alpha ${EXTRA_ARGS} ${source_path} ${target_path}
        MAIN_DEPENDENCY ${source_path}
        DEPENDS mipgen)
endfunction()

# Raw resource files can simply be copied into the server folder.
function(add_rawfile SOURCE TARGET)
    set(source_path "${ROOT_DIR}/${SOURCE}")
    set(target_path "${SERVER_DIR}/${TARGET}")
    set(target_textures ${target_textures} ${target_path} PARENT_SCOPE)
    add_custom_command(
        OUTPUT ${target_path}
        COMMAND ${CMAKE_COMMAND} -E copy ${source_path} ${target_path}
        MAIN_DEPENDENCY ${source_path})
endfunction()

add_ktxfiles("assets/models/monkey/color.png" "albedo.ktx2" "--compression=uastc")
add_ktxfiles("assets/models/monkey/normal.png" "normal.ktx2" "--compression=uastc_normals;--kernel=NORMALS;--linear")
add_ktxfiles("assets/models/monkey/roughness.png" "roughness.ktx2" "--compression=uastc;--grayscale;--linear")
add_ktxfiles("assets/models/monkey/metallic.png" "metallic.ktx2" "--compression=uastc;--grayscale;--linear")
add_ktxfiles("assets/models/monkey/ao.png" "ao.ktx2" "--compression=uastc;--grayscale;--linear")

add_rawfile("third_party/models/FlightHelmet/FlightHelmet_baseColor.png" "FlightHelmet_baseColor.png")
add_rawfile("third_party/models/FlightHelmet/FlightHelmet_baseColor1.png" "FlightHelmet_baseColor1.png")
add_rawfile("third_party/models/FlightHelmet/FlightHelmet_baseColor2.png" "FlightHelmet_baseColor2.png")
add_rawfile("third_party/models/FlightHelmet/FlightHelmet_baseColor3.png" "FlightHelmet_baseColor3.png")
add_rawfile("third_party/models/FlightHelmet/FlightHelmet_baseColor4.png" "FlightHelmet_baseColor4.png")
add_rawfile("third_party/models/FlightHelmet/FlightHelmet_normal.png" "FlightHelmet_normal.png")
add_rawfile("third_party/models/FlightHelmet/FlightHelmet_normal1.png" "FlightHelmet_normal1.png")
add_rawfile("third_party/models/FlightHelmet/FlightHelmet_normal2.png" "FlightHelmet_normal2.png")
add_rawfile("third_party/models/FlightHelmet/FlightHelmet_normal3.png" "FlightHelmet_normal3.png")
add_rawfile("third_party/models/FlightHelmet/FlightHelmet_normal4.png" "FlightHelmet_normal4.png")
add_rawfile("third_party/models/FlightHelmet/FlightHelmet_occlusionRoughnessMetallic.png" "FlightHelmet_occlusionRoughnessMetallic.png")
add_rawfile("third_party/models/FlightHelmet/FlightHelmet_occlusionRoughnessMetallic1.png" "FlightHelmet_occlusionRoughnessMetallic1.png")
add_rawfile("third_party/models/FlightHelmet/FlightHelmet_occlusionRoughnessMetallic2.png" "FlightHelmet_occlusionRoughnessMetallic2.png")
add_rawfile("third_party/models/FlightHelmet/FlightHelmet_occlusionRoughnessMetallic3.png" "FlightHelmet_occlusionRoughnessMetallic3.png")
add_rawfile("third_party/models/FlightHelmet/FlightHelmet_occlusionRoughnessMetallic4.png" "FlightHelmet_occlusionRoughnessMetallic4.png")
add_rawfile("third_party/models/FlightHelmet/FlightHelmet.bin" "FlightHelmet.bin")
add_rawfile("third_party/models/FlightHelmet/FlightHelmet.gltf" "FlightHelmet.gltf")

add_rawfile("third_party/models/AnimatedTriangle/simpleTriangle.bin" "simpleTriangle.bin")
add_rawfile("third_party/models/AnimatedTriangle/animation.bin" "animation.bin")
add_rawfile("third_party/models/AnimatedTriangle/AnimatedTriangle.gltf" "AnimatedTriangle.gltf")

add_rawfile("third_party/models/AnimatedMorphCube/AnimatedMorphCube.glb" "AnimatedMorphCube.glb")

# Convert OBJ files into filamesh files.
function(add_mesh SOURCE TARGET)
    set(source_mesh "${ROOT_DIR}/${SOURCE}")
    set(target_mesh "${SERVER_DIR}/${TARGET}")
    set(target_meshes ${target_meshes} ${target_mesh} PARENT_SCOPE)
    add_custom_command(
        OUTPUT ${target_mesh}
        COMMAND filamesh --compress ${source_mesh} ${target_mesh}
        MAIN_DEPENDENCY ${source_mesh}
        DEPENDS filamesh)
endfunction()

add_mesh("assets/models/monkey/monkey.obj" "suzanne.filamesh")
add_mesh("third_party/models/shader_ball/shader_ball.obj" "shader_ball.filamesh")

# Generate IBL and skybox images using cmgen.
set(CMGEN_ARGS --quiet --format=ktx --size=256 --extract-blur=0.1)
set(CMGEN_ARGS_TINY --quiet --format=ktx --size=64 --extract-blur=0.1)
function(add_envmap SOURCE TARGET)
    set(source_envmap "${ROOT_DIR}/${SOURCE}")

    file(MAKE_DIRECTORY "${SERVER_DIR}/${TARGET}")

    set(target_skybox "${SERVER_DIR}/${TARGET}/${TARGET}_skybox.ktx")
    set(target_envmap "${SERVER_DIR}/${TARGET}/${TARGET}_ibl.ktx")

    set(target_skybox_tiny "${SERVER_DIR}/${TARGET}/${TARGET}_skybox_tiny.ktx")

    set(target_skyboxes ${target_skyboxes} ${target_skybox} ${target_skybox_tiny} PARENT_SCOPE)

    set(target_envmaps ${target_envmaps} ${target_envmap} PARENT_SCOPE)

    add_custom_command(OUTPUT ${target_skybox} ${target_skybox_tiny} ${target_envmap}

        # Create a low-resolution skybox.
        COMMAND cmgen -x ${TARGET} ${CMGEN_ARGS_TINY} ${source_envmap}
        COMMAND ${CMAKE_COMMAND} -E rename ${target_skybox} ${target_skybox_tiny}

        # Create KTX files for the full-size envmap.
        COMMAND cmgen -x ${TARGET} ${CMGEN_ARGS} ${source_envmap}

        MAIN_DEPENDENCY ${source_envmap}
        DEPENDS cmgen)
endfunction()

# The pillars envmap is used only when building new HTML for the tutorials.
# add_envmap("third_party/environments/pillars_2k.hdr" "pillars_2k")

add_envmap("third_party/environments/lightroom_14b.hdr" "default_env")

add_custom_target(sample_assets DEPENDS
    ${target_textures}
    ${target_meshes}
    ${target_envmaps}
    ${target_skyboxes})

# ==================================================================================================
# Copy filament.{js,wasm} into the server folder.
# ==================================================================================================

add_custom_command(
    OUTPUT ${SERVER_DIR}/filament.js
    DEPENDS filament-js
    COMMAND ${CMAKE_COMMAND} -E copy ${PROJECT_BINARY_DIR}/../filament-js/filament.js ${SERVER_DIR})

add_custom_command(
    OUTPUT ${SERVER_DIR}/filament.wasm
    DEPENDS filament-js
    COMMAND ${CMAKE_COMMAND} -E copy ${PROJECT_BINARY_DIR}/../filament-js/filament.wasm ${SERVER_DIR})

add_custom_command(
    OUTPUT ${SERVER_DIR}/filament-viewer.js
    DEPENDS ${PROJECT_BINARY_DIR}/../filament-js/filament-viewer.js
    COMMAND ${CMAKE_COMMAND} -E copy ${PROJECT_BINARY_DIR}/../filament-js/filament-viewer.js ${SERVER_DIR})

add_custom_target(filamentjs_public DEPENDS
    ${SERVER_DIR}/filament.js
    ${SERVER_DIR}/filament.wasm
    ${SERVER_DIR}/filament-viewer.js)

if (WEBGL_PTHREADS)
    add_custom_command(
        OUTPUT ${SERVER_DIR}/filament.worker.js
        DEPENDS filament-js
        COMMAND ${CMAKE_COMMAND} -E copy ${PROJECT_BINARY_DIR}/../filament-js/filament.worker.js ${SERVER_DIR})

    add_dependencies(filamentjs_public ${SERVER_DIR}/filament.worker.js)
endif()

# ==================================================================================================
# The websamples target depends on all HTML files, assets, and filament.{js,wasm}
# ==================================================================================================

set(HTML_FILES
    animation.html
    helmet.html
    morphing.html
    parquet.html
    remote.html
    skinning.html
    suzanne.html
    test-filament-viewer.html
    triangle.html)

set(ASSET_FILES
    assets/favicon.png)

set(DEMO_ASSETS)
foreach (NAME ${HTML_FILES} ${ASSET_FILES})
    add_custom_command(
        OUTPUT ${SERVER_DIR}/${NAME}
        COMMAND ${CMAKE_COMMAND} -E copy ${CMAKE_CURRENT_SOURCE_DIR}/${NAME} ${SERVER_DIR}
        MAIN_DEPENDENCY ${CMAKE_CURRENT_SOURCE_DIR}/${NAME})
    list(APPEND DEMO_ASSETS ${SERVER_DIR}/${NAME})
endforeach()

set(TEXTURE_FILES floor_ao_roughness_metallic.png floor_basecolor.jpg floor_normal.png)
foreach (NAME ${TEXTURE_FILES})
    add_custom_command(
        OUTPUT ${SERVER_DIR}/${NAME}
        COMMAND ${CMAKE_COMMAND} -E copy ${CMAKE_CURRENT_SOURCE_DIR}/textures/${NAME} ${SERVER_DIR}
        MAIN_DEPENDENCY ${CMAKE_CURRENT_SOURCE_DIR}/textures/${NAME})
    list(APPEND DEMO_ASSETS ${SERVER_DIR}/${NAME})
endforeach()

add_custom_command(
    OUTPUT ${SERVER_DIR}/gl-matrix-min.js
    COMMAND ${CMAKE_COMMAND} -E copy ${CMAKE_CURRENT_SOURCE_DIR}/../../third_party/gl-matrix/gl-matrix-min.js ${SERVER_DIR}/gl-matrix-min.js
    MAIN_DEPENDENCY ${CMAKE_CURRENT_SOURCE_DIR}/../../third_party/gl-matrix/gl-matrix-min.js)
list(APPEND DEMO_ASSETS ${SERVER_DIR}/gl-matrix-min.js)

add_custom_command(
    OUTPUT ${SERVER_DIR}/gltumble.min.js
    COMMAND ${CMAKE_COMMAND} -E copy ${CMAKE_CURRENT_SOURCE_DIR}/../../third_party/gltumble/gltumble.min.js ${SERVER_DIR}/gltumble.min.js
    MAIN_DEPENDENCY ${CMAKE_CURRENT_SOURCE_DIR}/../../third_party/gltumble/gltumble.min.js)
list(APPEND DEMO_ASSETS ${SERVER_DIR}/gltumble.min.js)

add_custom_target(${PROJECT_NAME} ALL DEPENDS
    ${DEMO_ASSETS}
    sample_materials
    sample_assets
    filamentjs_public)