From c8a110cdeca8c23b88d6908f0b06231847c9e722 Mon Sep 17 00:00:00 2001
From: tomsmeding <tom.smeding@gmail.com>
Date: Thu, 29 Dec 2016 11:18:04 +0100
Subject: Enable retrieving of sprite image length

Without having to know the name of the symbol at compile time...
---
 Makefile | 6 +++---
 sprite.h | 6 ++++++
 2 files changed, 9 insertions(+), 3 deletions(-)
 create mode 100644 sprite.h

diff --git a/Makefile b/Makefile
index 09b0e36..995f07f 100644
--- a/Makefile
+++ b/Makefile
@@ -12,7 +12,7 @@ sprite_allfiles := $(wildcard src/sprites/*)
 sprite_fnames := $(filter %.png,$(sprite_allfiles))
 sprite_skipped := $(filter-out %.png,$(sprite_allfiles))
 sprite_obj := $(patsubst src/sprites/%.png,build/sprites/%.o,$(sprite_fnames))
-sprite_externs := $(shell echo $$(for f in $(sprite_obj); do basename $$f | sed 's/\.[^.]*$$//' | sed 's/.*/extern const unsigned char &[];/'; done))
+sprite_externs := $(shell echo $$(for f in $(sprite_obj); do basename $$f | sed 's/\.[^.]*$$//' | sed 's/.*/extern const Sprite &;/'; done))
 
 base_src := $(wildcard *_base.cpp)
 base_src += library.cpp main.cpp
@@ -80,10 +80,10 @@ build/sprites/%.o: build/sprites/%.cpp
 build/sprites/%.cpp: src/sprites/%.png
 	echo Generating for sprite $*
 	mkdir -p $(dir $@)
-	printf "const unsigned char $*[]={\n%s, 0\n};\nconst unsigned int _$*_len=%d;\n" "$$(xxd -i <"$<")" $$(stat -f '%z' "$<") >"$@"
+	printf "#include \"sprite.h\"\n\nstatic const unsigned char data[]={\n%s, 0\n};\n\nSprite $*=(Sprite){.image=data,.image_len=%d};\n" "$$(xxd -i <"$<")" $$(stat -f '%z' "$<") >"$@"
 
 build/sprites.h:
 	echo Collecting generated sprite files
 	mkdir -p $(dir $@)
-	echo "$(sprite_externs)" >"$@"
+	printf "#include \"sprite.h\"\n\n$(sprite_externs)\n" >"$@"
 	test -z "$(sprite_skipped)" || printf "\x1B[1mWARNING: skipped files in src/sprites: $(notdir $(sprite_skipped))\x1B[0m\n"
diff --git a/sprite.h b/sprite.h
new file mode 100644
index 0000000..e901c9a
--- /dev/null
+++ b/sprite.h
@@ -0,0 +1,6 @@
+#pragma once
+
+struct Sprite{
+	const unsigned char *image;
+	unsigned int image_len;
+};
-- 
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