From 2c4b835fe1c6ad10ff16aa96140ff17a69282a43 Mon Sep 17 00:00:00 2001
From: zlago
Date: Wed, 9 Oct 2024 20:21:58 +0200
Subject: emscripten support

---
 GNUmakefile  | 11 ++++++-----
 build.sh     |  9 ++++++---
 src/incbin.S | 12 ++++++++++++
 src/incbin.s |  7 -------
 src/main.c   | 44 +++++++++++++++++++++++++++++++++++++++++---
 src/zip.c    |  2 +-
 6 files changed, 66 insertions(+), 19 deletions(-)
 create mode 100644 src/incbin.S
 delete mode 100644 src/incbin.s

diff --git a/GNUmakefile b/GNUmakefile
index 8b08ac0..f1720b7 100644
--- a/GNUmakefile
+++ b/GNUmakefile
@@ -1,9 +1,10 @@
 #!/usr/bin/env -S gmake -f
 
-export MKDIR ?= mkdir -p
+MKDIR ?= mkdir -p
 
 libs := SDL2 m z
 
+EXTENSION ?= out
 CFLAGS ?= -Wall -Wpedantic -g -Og
 cflags := ${CFLAGS}
 ldflags := $(addprefix -l,${libs}) ${LDFLAGS}
@@ -14,9 +15,9 @@ deps := $(addprefix out/${NS}/,$(notdir $(patsubst %.c,%.d,$(wildcard src/*.c)))
 
 .PHONY: all run clean
 
-all: out/${NS}/a.out out/assets.res
+all: out/${NS}/a.${EXTENSION} out/assets.res
 
-run: out/${NS}/a.out out/assets.res
+run: out/${NS}/a.${EXTENSION} out/assets.res
 	./$^
 
 clean:
@@ -33,13 +34,13 @@ out/${NS}/libplum.o: cflags += -w
 out/${NS}/%.o: src/%.c out/${NS}/%.d | out/${NS}/
 	${CC} -c -o $@ $< ${cflags}
 
-out/${NS}/incbin.o: src/incbin.s | out/${NS}/
+out/${NS}/incbin.o: src/incbin.S | out/${NS}/
 	${CC} -c -o $@ $< -Wa,-I,src/ ${cflags}
 
 out/${NS}/%.d: src/%.c | out/${NS}/
 	${CC} ${cflags} ${CPPFLAGS} -MM -MG -MF $@ -MT "${@:.d=.o} $@" $<
 
-out/${NS}/a.out: ${objs} out/${NS}/incbin.o | out/${NS}/
+out/${NS}/a.${EXTENSION}: ${objs} out/${NS}/incbin.o | out/${NS}/
 	${CC} -o $@ $^ ${cflags} ${ldflags}
 
 include assets.mk
diff --git a/build.sh b/build.sh
index 7f72b4d..aeb3c3d 100755
--- a/build.sh
+++ b/build.sh
@@ -2,16 +2,19 @@
 
 case $1 in
 	gnu-linux)
-		NS=gl CFLAGS='-g1 -Os' make
+		NS=gl EXTENSION=x86_64 CFLAGS='-g1 -Os' make
 		;;
 	ms-windows)
-		NS=w CFLAGS='-g1 -Os -mwindows' CC='x86_64-w64-mingw32-cc' make
+		NS=w EXTENSION=exe CFLAGS='-g1 -Os -mwindows' CC='x86_64-w64-mingw32-cc' make
 		;;
 	leak)
 		NS=leak CC='cc -fsanitize=leak' CFLAGS='-g -O0' make
 		;;
 	ub)
-		NS=leak CC='cc -fsanitize=undefined' CFLAGS='-g -O0' make
+		NS=ub CC='cc -fsanitize=undefined' CFLAGS='-g -O0' make
+		;;
+	emscripten)
+		NS=em EXTENSION=html CC='/usr/lib/emscripten/emcc' CFLAGS='-g2 -O1 -sUSE_SDL=2 -sUSE_ZLIB' LDFLAGS='-sASYNCIFY --embed-file out/assets.res@./assets.res' make
 		;;
 	*)
 		echo >&2 "dont know how to build '$1'"
diff --git a/src/incbin.S b/src/incbin.S
new file mode 100644
index 0000000..c9d6fd4
--- /dev/null
+++ b/src/incbin.S
@@ -0,0 +1,12 @@
+// binary includes
+
+.data
+
+_game_icon: .incbin "res/icon.png"
+_game_icon_end:
+.global _game_icon, _game_icon_end
+
+#if defined(__EMSCRIPTEN__)
+.size _game_icon, 1
+.size _game_icon_end, 1
+#endif
diff --git a/src/incbin.s b/src/incbin.s
deleted file mode 100644
index 9d6420b..0000000
--- a/src/incbin.s
+++ /dev/null
@@ -1,7 +0,0 @@
-// binary includes
-
-.data
-
-_game_icon: .incbin "res/icon.png"
-_game_icon_end:
-.global _game_icon, _game_icon_end
diff --git a/src/main.c b/src/main.c
index fbbb371..5cb3960 100644
--- a/src/main.c
+++ b/src/main.c
@@ -25,6 +25,13 @@ char *game_next_level;
 
 static void *particle_tex = NULL;
 
+static SDL_Texture *framebuffer;
+
+#if defined(__EMSCRIPTEN__)
+#include <emscripten.h>
+void main_loop(void);
+#endif
+
 #define WINDOW_WIDTH 160
 #define WINDOW_HEIGHT 90
 #define INIT_SUBSYSTEMS SDL_INIT_VIDEO
@@ -282,6 +289,9 @@ int main(int const argc, char *const *const argv) {
 		return EXIT_FAILURE;
 	}
 	SDL_StopTextInput();
+	#if defined(__EMSCRIPTEN__)
+	scale = 1;
+	#else
 	if (scale <= 0) { // this looks very wrong
 		SDL_DisplayMode dm;
 		if (SDL_GetDesktopDisplayMode(0, &dm) != 0) {
@@ -304,6 +314,7 @@ int main(int const argc, char *const *const argv) {
 			}
 		}
 	}
+	#endif
 	
 	window = SDL_CreateWindow(":3", SDL_WINDOWPOS_UNDEFINED, SDL_WINDOWPOS_UNDEFINED, WINDOW_WIDTH * scale, WINDOW_HEIGHT * scale, flags | SDL_WINDOW_HIDDEN);
 	if (window == NULL) {
@@ -318,7 +329,7 @@ int main(int const argc, char *const *const argv) {
 	SDL_RenderSetLogicalSize(renderer, WINDOW_WIDTH, WINDOW_HEIGHT);
 	SDL_SetRenderDrawBlendMode(renderer, SDL_BLENDMODE_BLEND);
 
-	SDL_Texture *framebuffer = SDL_CreateTexture(renderer, SDL_PIXELTYPE_UNKNOWN, SDL_TEXTUREACCESS_TARGET, WINDOW_WIDTH, WINDOW_HEIGHT);
+	framebuffer = SDL_CreateTexture(renderer, SDL_PIXELTYPE_UNKNOWN, SDL_TEXTUREACCESS_TARGET, WINDOW_WIDTH, WINDOW_HEIGHT);
 	
 	{
 		res_init();
@@ -376,12 +387,29 @@ int main(int const argc, char *const *const argv) {
 
 	SDL_ShowWindow(window);
 	
-	int x = 0, y = 0, fade = 0;
 	player_new(&next_entities);
 	player_property(next_entities.player, "x", "40");
 	player_property(next_entities.player, "y", "64");
 	memcpy(&entities, &next_entities, sizeof (entities));
+#if defined(__EMSCRIPTEN__)
+	emscripten_set_main_loop(main_loop, 60, 0); // TODO: how do i query the framerate if i set it to 0?
+	return 0;
+	
+	end:
+	tilemap_free(tilemap), tilemap = NULL;
+	SDL_DestroyRenderer(renderer);
+	SDL_DestroyWindow(window);
+	SDL_QuitSubSystem(INIT_SUBSYSTEMS);
+	return 0;
+}
+
+int x = 0, y = 0, fade = 0;
+
+void main_loop(void) {
+#else
+	int x = 0, y = 0, fade = 0;
 	while (1) {
+#endif
 		input_pressed = input_held;
 		SDL_Event evt;
 		while (SDL_PollEvent(&evt)) {
@@ -427,6 +455,10 @@ int main(int const argc, char *const *const argv) {
 					break;
 				case SDL_CLIPBOARDUPDATE: // annoying
 					break;
+				case SDL_FINGERDOWN:
+				case SDL_FINGERUP:
+				case SDL_FINGERMOTION:
+					break;
 				case SDL_WINDOWEVENT: // window related events
 					switch (evt.window.event) {
 						case SDL_WINDOWEVENT_SHOWN:
@@ -547,12 +579,18 @@ int main(int const argc, char *const *const argv) {
 				}
 				break;
 		}
+#if defined(__EMSCRIPTEN__)
+	return;
+#else
 	}
+#endif
 	
 	end:
 	tilemap_free(tilemap), tilemap = NULL;
 	SDL_DestroyRenderer(renderer);
 	SDL_DestroyWindow(window);
-	//SDL_QuitSubSystem(INIT_SUBSYSTEMS);
+	SDL_QuitSubSystem(INIT_SUBSYSTEMS);
+#if !defined(__EMSCRIPTEN__)
 	return 0;
+#endif
 }
diff --git a/src/zip.c b/src/zip.c
index 76820b5..97ef028 100644
--- a/src/zip.c
+++ b/src/zip.c
@@ -61,7 +61,7 @@ struct zip_file *zip_index(char *const restrict file, size_t const size, int *co
 
 static struct zip_footer *zip_find_footer(char *const file, size_t const size, int *const error) {
 	// check if zip file is too big, and if size_t can store values bigger than a max* size zip file
-	if ((size_t) 1 << 32 && size >= (size_t) 1 << 32) {
+	if ((size_t) 1 << 31 << 1 && size >= (size_t) 1 << 31 << 1) {
 		*error = ZIP_BIG;
 		return NULL;
 	}
-- 
cgit 1.4.1-2-gfad0