# Embeds the native renderer HLSL sources (src/native/shaders/*.hlsl) into a
# generated C++ header so the exe stays self-contained. Run as a script:
#   cmake -DSHADER_DIR=<dir> -DOUT=<header> -P EmbedShaders.cmake
# Each shader becomes `inline constexpr char <var>[] = R"__hlsl__(...)__hlsl__";`
# with a leading newline, matching the original in-cpp raw string literals
# (consumers use sizeof(kX) - 1).

set(SHADER_VARS
    kShaderSource
    kShadowBlurSource
    kResolveShaderSource
    kBlurShaderSource
    kOutlineShaderSource
    kShader2dSource
    kShaderSplineSource
    kPhotoFxShaderSource
    kSsaoShaderSource
    kHdrShaderSource
    kSsrShaderSource
)
set(SHADER_FILES
    scene.hlsl
    shadow_blur.hlsl
    resolve.hlsl
    blur.hlsl
    outline.hlsl
    overlay2d.hlsl
    spline.hlsl
    photo_fx.hlsl
    ssao.hlsl
    hdr.hlsl
    ssr.hlsl
)

set(content "// Generated by cmake/EmbedShaders.cmake from src/native/shaders/*.hlsl.\n")
string(APPEND content "// DO NOT EDIT - edit the .hlsl files instead.\n")
string(APPEND content "#pragma once\n\n")

foreach(var file IN ZIP_LISTS SHADER_VARS SHADER_FILES)
    file(READ "${SHADER_DIR}/${file}" src)
    string(FIND "${src}" ")__hlsl__" collision)
    if(NOT collision EQUAL -1)
        message(FATAL_ERROR "${file} contains the raw-string delimiter )__hlsl__")
    endif()
    string(APPEND content "// ${file}\n")
    string(APPEND content "inline constexpr char ${var}[] = R\"__hlsl__(\n${src})__hlsl__\";\n\n")
endforeach()

file(WRITE "${OUT}" "${content}")