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# Function to turn an GLSL shader source file into a C string within a source file.
# xxd uses its input's filename to name the string and its length, so we
# need to move them to a name that depends only on the path output, not its
# input. Otherwise, builds in different relative locations would put the
# source into different variable names, and everything would fall over.
# The actual name will be filename (.s replaced with underscores), and length
# name_len.
#
# Usage example:
#
# set(KERNELS a.cl b/c.cl)
# resource_to_cxx_source(
# SOURCES ${KERNELS}
# VARNAME OUTPUTS
# )
# add_executable(foo ${OUTPUTS})
#
# The namespace they are placed in is taken from filename.namespace.
#
# For example, if the input file is kernel.cl, the two variables will be
# unsigned char ns::kernel_cl[];
# unsigned int ns::kernel_cl_len;
#
# where ns is the contents of kernel.cl.namespace.
INCLUDE(CMakeParseArguments)
SET(GLSL2CPP_PROGRAM "glsl2cpp")
FUNCTION(GLSL_TO_H)
CMAKE_PARSE_ARGUMENTS(RTCS "" "VARNAME;EXTENSION;OUTPUT_DIR;TARGETS;NAMESPACE;EOF" "SOURCES" ${ARGN})
SET(_output_files "")
FOREACH(_input_file ${RTCS_SOURCES})
GET_FILENAME_COMPONENT(_path "${_input_file}" PATH)
GET_FILENAME_COMPONENT(_name "${_input_file}" NAME)
GET_FILENAME_COMPONENT(var_name "${_input_file}" NAME_WE)
SET(_namespace "${RTCS_NAMESPACE}")
STRING(REPLACE "." "_" var_name ${var_name})
SET(_output_path "${CMAKE_CURRENT_BINARY_DIR}/${RTCS_OUTPUT_DIR}")
SET(_output_file "${_output_path}/${var_name}.${RTCS_EXTENSION}")
ADD_CUSTOM_COMMAND(
OUTPUT ${_output_file}
DEPENDS ${_input_file} ${GLSL2CPP_PROGRAM}
COMMAND ${CMAKE_COMMAND} -E make_directory "${_output_path}"
COMMAND ${CMAKE_COMMAND} -E echo "\\#include \\<${_path}/${var_name}.hpp\\>" >>"${_output_file}"
COMMAND ${GLSL2CPP_PROGRAM} --file ${_name} --namespace ${_namespace} --output ${_output_file} --name ${var_name} --eof ${RTCS_EOF}
WORKING_DIRECTORY "${_path}"
COMMENT "Converting ${_input_file} to GLSL source string"
)
LIST(APPEND _output_files ${_output_file})
ENDFOREACH()
ADD_CUSTOM_TARGET(${RTCS_NAMESPACE}_bin_target DEPENDS ${_output_files})
SET("${RTCS_VARNAME}" ${_output_files} PARENT_SCOPE)
SET("${RTCS_TARGETS}" ${RTCS_NAMESPACE}_bin_target PARENT_SCOPE)
ENDFUNCTION(GLSL_TO_H)
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