Headers containing shader program sources are generated using CMake.

# CMake script file to process a GLSL source file, so it can be included

# in C array and compiled in to an application.

# number of input files

list( LENGTH inputFiles shadersNumber ) 

# write header

file( WRITE ${outputFile} "// Do not edit this file, it is autogenerated by CMake.

#ifndef SHADER_SRC_H

#define SHADER_SRC_H

const unsigned int shaders_number = ${shadersNumber};

const char *shaders_src[] = {\n" )

foreach( inputFile ${inputFiles} )

	# put the input file name into the output file

	file( APPEND ${outputFile} "\n// ${inputFile}" )

	# process the input file

	file( READ ${inputFile} contents )

	# remove /* */ comments

	string( REGEX REPLACE "/\\*.*\\*/" "" contents "${contents}" )

	# remove // comments

	string( REGEX REPLACE "//[^\n]*" "" contents "${contents}" )

	# remove whitespaces at the beginning of each line

	string( REGEX REPLACE "\n([\t ])*" "\n" contents "${contents}" )

	# remove unnecessary spaces

	string( REGEX REPLACE " *([\\*/+&\\|,=<>\(\)]) *" "\\1" contents "${contents}" )

	# remove empty lines & wrap every line in "" and add '\n' at the end of each line	

	string( REGEX REPLACE "\n+" "\\\\n\"\n\"" contents "${contents}" )

	# remove unnecessary " & \n from the beginning and the end of contents

	string( REGEX REPLACE "^\\\\n\"" "" contents "${contents}" )

	string( REGEX REPLACE "\"$" "," contents "${contents}" )

	file( APPEND ${outputFile} "${contents}" )

endforeach( inputFile ${inputFiles} )

# write footer

file( APPEND ${outputFile} "};

#endif /* SHADER_SRC_H */" )

    ${INC_AFTER}

    )

# Generate files containing shader programs

# Generate header files containing shader programs

# Order of input files is significant

add_custom_command(

    OUTPUT gal/opengl/shader_src.h

    DEPENDS gal/opengl/make_shader_src_h.sh

    COMMAND ${CMAKE_COMMAND}

        -DinputFiles="${PROJECT_SOURCE_DIR}/common/gal/opengl/shader.vert\\;${PROJECT_SOURCE_DIR}/common/gal/opengl/shader.frag"

        -DoutputFile="shader_src.h"

        -P ${CMAKE_MODULE_PATH}/Shaders.cmake

    WORKING_DIRECTORY ${PROJECT_SOURCE_DIR}/common/gal/opengl

    COMMAND ${SHELL}

    ARGS ${PROJECT_SOURCE_DIR}/common/gal/opengl/make_shader_src_h.sh

    COMMENT "Generating headers containing GLSL source code"

)

add_custom_target(

    ShaderHeader ALL

    shader_headers ALL

    DEPENDS gal/opengl/shader_src.h

)

    )

add_library(gal STATIC ${GAL_SRCS})

add_dependencies(gal ShaderHeader)

add_dependencies(gal shader_headers)

if(WIN32)

add_definitions(-DGLEW_STATIC)

#!/bin/bash

# Make a header file containing GLSL source code

echo "Generating headers containing GLSL source code.."

# Source files to be included

SHADER_SRC=( "shader.vert" "shader.frag" )

# Number of shaders

SHADERS_NUMBER=${#SHADER_SRC[@]}

OUTPUT="shader_src.h"

UPDATE=false

# Check if it is necessary to regenerate headers

for filename in "${SHADER_SRC[@]}"

do

	if [[ $filename -nt $OUTPUT ]]; then

	    UPDATE=true

	fi

done

if [[ $UPDATE == false ]]; then

    echo "Headers are up-to-date."

    exit

fi

# Prepare GLSL source to be included in C array

function processSrc {

	# 1st part: remove /* */ comments

	# 2nd part: remove // comments

	# 3rd part: remove blank lines (or containing only whitespaces)

	# 4th & 5th part: wrap every line in quotation marks

	sed '/\/\*/,/\*\//d; s/[ \t]*\/\/.*$//; /^[ \t]*$/d; s/^[ \t]*/"/; s/[ \t]*$/\\n"/' $1 >> $OUTPUT

	echo "," >> $OUTPUT

}

# Header

echo "#ifndef SHADER_SRC_H

#define SHADER_SRC_H

const unsigned int shaders_number = $SHADERS_NUMBER;

const char *shaders_src[] = {" > $OUTPUT

# Main contents

for filename in "${SHADER_SRC[@]}"

do

	processSrc $filename

done

# Footer

echo "};

#endif /* SHADER_SRC_H */" >> $OUTPUT

echo "Done."