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set(SHADER_MODEL "6_5")
set(DXC ${PROJECT_SOURCE_DIR}/../contrib/dxc_2025_07_14/bin/x64/dxc.exe)
set(SHADERS_PATH ${CMAKE_CURRENT_SOURCE_DIR})
set(BUILD_DIR "${CMAKE_CURRENT_BINARY_DIR}")
# Compile HLSL to binary DXIL.
#
# This defines a custom command so that the shader is compiled at cmake build
# instead of configure.
#
# hlsl_file: "foo.hlsl"; just the file name, not the path.
# shader_type: "vs", "ps", "cs", etc.
# entry_point: "main", etc.
function(compile_shader hlsl_file shader_type entry_point dxil_file)
#string(REPLACE ".hlsl" ".dxil" dxil_file ${hlsl_file})
set(hlsl_path "${SHADERS_PATH}/${hlsl_file}")
set(dxil_path "${BUILD_DIR}/${dxil_file}")
set(target_profile "${shader_type}_${SHADER_MODEL}")
message("COMPILING ${dxil_path}")
message("DXC = ${DXC}")
add_custom_command(
OUTPUT ${dxil_path}
COMMAND ${DXC} -T ${target_profile} -E ${entry_point} ${hlsl_path} -Fo ${dxil_path}
WORKING_DIRECTORY ${BUILD_DIR}
DEPENDS ${hlsl_path}
COMMENT "Generating ${dxil_path}")
endfunction()
# Inline a binary file into C code.
# This is a workaround for the lack of C23 #embed in MSVC.
#
# identifier: Identifier to use for the global array that will contain the file,
# the generated file names, and the cmake target.
# file_path: Path to the binary file to embed.
#
# Reference: https://github.com/andoalon/embed-binaries
function(generate_c file_path identifier out_header_path out_source_path)
file(READ "${file_path}" file_contents HEX)
string(LENGTH "${file_contents}" file_contents_length)
math(EXPR file_bytes "${file_contents_length} / 2")
set(bytes_per_line 32)
string(REPEAT "[0-9a-f]" ${bytes_per_line} column_pattern)
string(REGEX REPLACE "(${column_pattern})" "\\1\n" code "${file_contents}")
string(REGEX REPLACE "([0-9a-f][0-9a-f])" "0x\\1," code "${code}")
set(declaration "const uint8_t ${identifier}[${file_bytes}]")
string(APPEND header "#pragma once\n\n#include <stdint.h>\n\nextern ${declaration}\;\n")
string(APPEND implementation "#include \"${identifier}.h\"\n\n${declaration} = {\n${code}}\;\n")
file(WRITE "${BUILD_DIR}/${identifier}.h" ${header})
file(WRITE "${BUILD_DIR}/${identifier}.c" ${implementation})
endfunction()
# Create a target that embeds the given DXIL file in a C header/source.
# Like compile_shader, this just adds the target so that the embedding is done
# at cmake build and not configure.
function(create_c_target dxil_file identifier)
set(dxil_path "${BUILD_DIR}/${dxil_file}")
string(REPLACE ".dxil" ".h" header_path ${dxil_path})
string(REPLACE ".dxil" ".c" source_path ${dxil_path})
add_custom_command(
OUTPUT "${header_path}" "${source_path}"
COMMAND ${CMAKE_COMMAND} -D dxil_path=${dxil_path} -D identifier=${identifier} -D out_header_path=${header_path} -D out_source_path=${source_path} -P ${CMAKE_CURRENT_LIST_FILE}
WORKING_DIRECTORY ${BUILD_DIR}
DEPENDS ${dxil_path}
COMMENT "Generating ${source_path}"
)
endfunction()
# Running in script mode.
# https://stackoverflow.com/questions/51427538/cmake-test-if-i-am-in-scripting-mode
#
# When running in script mode, we embed the binary DXIL into a generated C file.
if(CMAKE_SCRIPT_MODE_FILE AND NOT CMAKE_PARENT_LIST_FILE)
foreach(variable "dxil_path" "identifier" "out_header_path" "out_source_path")
if (NOT DEFINED ${variable})
message(FATAL_ERROR "'${variable}' is not defined")
endif()
endforeach()
generate_c("${dxil_path}" ${identifier} "${out_header_path}" "${out_source_path}")
else()
compile_shader("imm.hlsl" "vs" "vs" "imm_vs.dxil")
compile_shader("imm.hlsl" "ps" "ps" "imm_ps.dxil")
create_c_target("imm_vs.dxil" "imm_vs")
create_c_target("imm_ps.dxil" "imm_ps")
add_library(shaders
"${BUILD_DIR}/imm_ps.c"
"${BUILD_DIR}/imm_ps.h"
"${BUILD_DIR}/imm_vs.c"
"${BUILD_DIR}/imm_vs.h")
target_include_directories(shaders PUBLIC
${BUILD_DIR})
endif()
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