[shaders] update compile_shaders

move compile_shaders to scripts

Author: tgfrerer

modules/le_2d/shaders/README.md

@@ -0,0 +1,4 @@
+# To compile shaders in this directory, issue the following command:
+
+
+../../../scripts/compile_shaders.sh .

modules/le_imgui/shaders/README.md

@@ -0,0 +1,4 @@
+# To compile shaders in this directory, issue the following command:
+
+
+../../../scripts/compile_shaders.sh .

modules/le_imgui/shaders/compile_shaders.sh

@@ -0,0 +1,62 @@
+#!/bin/bash
+
+# This script will compile shaders from glsl source to spir-v, 
+# and will autogenerate a .h file with embedded spir-v code for 
+# each source shader  file.
+
+INVOCATION_DIR=$(realpath "$PWD")
+WORKING_DIR="$INVOCATION_DIR"
+
+if [ "$1" ]; then
+    # echo "Parameter given: '$1'"
+    if [[ -d "${WORKING_DIR}/$1" ]]; then
+        # echo "parameter names a directory"
+        WORKING_DIR="${WORKING_DIR}/$1"
+    elif [[ -f "${WORKING_DIR}/$1" ]]; then
+        # echo "parameter does name a file"
+        TARGET_FILE="${WORKING_DIR}/$1"
+        WORKING_DIR=$(dirname "$TARGET_FILE")
+    else
+        echo "File or directory not found: '$1'"
+        exit 1
+    fi
+fi
+
+WORKING_DIR=$(realpath "${WORKING_DIR}")
+
+cd "$WORKING_DIR" || exit 1
+
+# echo "working dir set to: '$WORKING_DIR'"
+# echo "target file set to $TARGET_FILE"
+
+######################################################################
+# Generates .h files holding SPIR-V (encoded as uint32_t array) 
+# from .vert/.frag/.comp glsl code.
+######################################################################
+if [[ -e "$TARGET_FILE" ]]; then
+    # echo "target file exists"
+    FILES="$TARGET_FILE"
+else
+    FILES=$(find "$WORKING_DIR" \
+           -name "*.vert" \
+        -o -name "*.frag" \
+        -o -name "*.comp" \
+    )
+fi
+
+for FILE in $FILES; do
+
+    # In case there is no match, $FILE may still contain something like "*.comp"
+    # in which case we want to skip this iteration of the loop.
+    if [ ! -e "$FILE" ]; then
+        continue
+    fi
+
+    FILENAME=$(basename "${FILE%.*}_${FILE#*.}")
+    VARNAME=$(echo "SPIRV_SOURCE_${FILENAME}" | tr '[:lower:]' '[:upper:]')
+
+    echo "$FILE → ${FILENAME}.h"
+    glslang --quiet -o "${FILENAME}.h" -V --vn "$VARNAME" "$FILE" 
+done
+
+cd "$INVOCATION_DIR" || exit 1