Headers containing shader program sources are generated using CMake.

CMakeModules/Shaders.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 */" )
+

common/CMakeLists.txt

@@ -11,17 +11,20 @@ include_directories(
     ${INC_AFTER}
     )
 
-# Generate files containing shader programs
-add_custom_command (
+# 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
+add_custom_target(
+    shader_headers ALL
     DEPENDS gal/opengl/shader_src.h
 )
 
@@ -40,7 +43,7 @@ set(GAL_SRCS
     )
 
 add_library(gal STATIC ${GAL_SRCS})
-add_dependencies(gal ShaderHeader)
+add_dependencies(gal shader_headers)
 
 if(WIN32)
 add_definitions(-DGLEW_STATIC)

common/gal/opengl/make_shader_src_h.sh

-#!/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."