scripts/shader-cpp.sh

   1 #!/bin/sh
   2
   3 case "$0" in
   4         */*)
   5                 cd "${0%/*}"
   6                 ;;
   7 esac
   8
   9 . ./shader-parser.subr
  10
  11 LF="
  12 "
  13 TAB="   "
  14
  15 parse_shader_pre()
  16 {
  17         shadertext=
  18         shaderconds=
  19 }
  20 parse_conditional()
  21 {
  22         shaderconds="$shaderconds$LF$*"
  23 }
  24 parse_shader_line()
  25 {
  26         case "$1" in
  27                 '#if')
  28                         parse_conditional $2 $3
  29                         ;;
  30         esac
  31         shadertext="$shadertext$LF$TAB$*"
  32 }
  33 parse_shaderstage_pre()
  34 {
  35         shadertext="$shadertext$LF$TAB{"
  36 }
  37 parse_shaderstage_line()
  38 {
  39         case "$1" in
  40                 '#if')
  41                         parse_conditional $2 $3
  42                         ;;
  43         esac
  44         shadertext="$shadertext$LF$TAB$TAB$*"
  45 }
  46 parse_shaderstage_post()
  47 {
  48         shadertext="$shadertext$LF$TAB}"
  49 }
  50 # note: the conds are what is FALSE, not TRUE
  51 shaderkill()
  52 {
  53         parseALLtheconds=$conds
  54         while :; do
  55                 case "$parseALLtheconds" in
  56                         '')
  57                                 break
  58                                 ;;
  59                         *$LF*)
  60                                 thiscond=${parseALLtheconds%%$LF*}
  61                                 parseALLtheconds=${parseALLtheconds#*$LF}
  62                                 ;;
  63                         *)
  64                                 thiscond=$parseALLtheconds
  65                                 parseALLtheconds=
  66                                 ;;
  67                 esac
  68                 [ -n "$thiscond" ] || continue
  69                 echo "$TAB""dpshaderkillifcvar $thiscond"
  70         done
  71 }
  72 preprocess()
  73 {
  74         condstack=
  75         echo "$shadertext" | while IFS= read -r L; do
  76                 [ -n "$L" ] || continue
  77                 set -- $L
  78                 k=$1
  79                 shift
  80                 case "$k" in
  81                         '#if')
  82                                 case "$LF$conds$LF" in
  83                                         *"$LF$*$LF"*)
  84                                                 condstack=0$condstack
  85                                                 ;;
  86                                         *)
  87                                                 condstack=1$condstack
  88                                                 ;;
  89                                 esac
  90                                 ;;
  91                         '#else')
  92                                 case "$condstack" in
  93                                         0*)
  94                                                 condstack=1${condstack#0}
  95                                                 ;;
  96                                         1*)
  97                                                 condstack=0${condstack#1}
  98                                                 ;;
  99                                 esac
 100                                 ;;
 101                         '#endif')
 102                                 condstack=${condstack#?}
 103                                 ;;
 104                         *)
 105                                 case "$condstack" in
 106                                         *0*)
 107                                                 ;;
 108                                         *)
 109                                                 echo "${L% }"
 110                                                 ;;
 111                                 esac
 112                                 ;;
 113                 esac
 114         done
 115 }
 116 conditionalize()
 117 {
 118         case "$1" in
 119                 '')
 120                         # no conditions
 121                         echo "$parsing_shader"
 122                         echo "{"
 123                         shaderkill
 124                         preprocess
 125                         echo "}"
 126                         return
 127                         ;;
 128                 *$LF*)
 129                         # many conditions
 130                         firstcond="${1%%$LF*}"
 131                         restcond="${1#*$LF}"
 132                         ;;
 133                 *)
 134                         firstcond=$1
 135                         restcond=
 136                         ;;
 137         esac
 138         (
 139                 conds="$conds$LF$firstcond"
 140                 conditionalize "$restcond"
 141         )
 142         (
 143                 set -- $firstcond
 144                 case "$2" in
 145                         '==') op='!=' ;;
 146                         '!=') op='==' ;;
 147                         '>') op='<=' ;;
 148                         '<') op='>=' ;;
 149                         '>=') op='<' ;;
 150                         '<=') op='>' ;;
 151                 esac
 152                 set -- "$1" "$op" "$3"
 153                 conds="$conds$LF$*"
 154                 conditionalize "$restcond"
 155         )
 156 }
 157 parse_shader_post()
 158 {
 159         allconds=`echo "$shaderconds" | sort -u | grep .`
 160         conds=
 161         conditionalize "$allconds"
 162 }
 163
 164 parse_shaders "$@"