Split large shader files into string literals rejoined into std strings

CMakeModules/BuildSteps/CreateShaderCpp.cmake

@@ -1,14 +1,49 @@
 file( READ ${SOURCE} SOURCE_TEXT )
+file( SIZE ${SOURCE} SOURCE_FILESIZE )
+
+set( MAX_BYTES_PER_LITERAL 16380 )
+
+math(EXPR NUMBER_LITERALS "${SOURCE_FILESIZE}/${MAX_BYTES_PER_LITERAL}")
+
+
+set( outCppTextStdString "std::string ${OUTVARNAME} = ")
 
 set( outCppText
 "
+#include <string>
 #include <${OUTHEADERFILE}>
 
 namespace KIGFX {
 namespace BUILTIN_SHADERS {
-const char ${OUTVARNAME}[] = R\"SHADER_SOURCE(
+")
+
+
+MATH(EXPR LAST_LITERAL_ITER "${LITERAL_ITER}-1")
+
+foreach(LITERAL_ITER RANGE ${NUMBER_LITERALS})
+    set( outCppText
+    "
+${outCppText}
+
+const char ${OUTVARNAME}_p${LITERAL_ITER}[] = R\"SHADER_SOURCE(
 ${SOURCE_TEXT}
 )SHADER_SOURCE\";
+
+    " )
+
+    set( outCppTextStdString "${outCppTextStdString} std::string(${OUTVARNAME}_p${LITERAL_ITER})")
+    if( ${LITERAL_ITER} LESS  ${LAST_LITERAL_ITER})
+        set( outCppTextStdString " ${outCppTextStdString} +")
+    endif()
+endforeach()
+
+set( outCppTextStdString "${outCppTextStdString};")
+
+set( outCppText
+"
+${outCppText}
+
+${outCppTextStdString}
 }
 }
 " )
@@ -22,7 +57,7 @@ file(
 set( outHeaderText
 "namespace KIGFX {
     namespace BUILTIN_SHADERS {
-        extern const char ${OUTVARNAME}[];
+        extern std::string ${OUTVARNAME};
     }
 }"
 )