Start work on WASM frontend

Makefile

@@ -126,7 +126,7 @@ quicklook: $(BIN)/SameBoy.qlgenerator
 sdl: $(SDL_TARGET) $(BIN)/SDL/dmg_boot.bin $(BIN)/SDL/cgb_boot.bin $(BIN)/SDL/agb_boot.bin $(BIN)/SDL/sgb_boot.bin $(BIN)/SDL/sgb2_boot.bin $(BIN)/SDL/LICENSE $(BIN)/SDL/registers.sym $(BIN)/SDL/background.bmp $(BIN)/SDL/Shaders
 bootroms: $(BIN)/BootROMs/agb_boot.bin $(BIN)/BootROMs/cgb_boot.bin $(BIN)/BootROMs/dmg_boot.bin $(BIN)/BootROMs/sgb_boot.bin $(BIN)/BootROMs/sgb2_boot.bin
 tester: $(TESTER_TARGET) $(BIN)/tester/dmg_boot.bin $(BIN)/tester/cgb_boot.bin $(BIN)/tester/agb_boot.bin $(BIN)/tester/sgb_boot.bin $(BIN)/tester/sgb2_boot.bin
-all: cocoa sdl tester libretro
+all: cocoa sdl tester libretro wasm
 
 # Get a list of our source files and their respective object file targets
 
@@ -151,7 +151,7 @@ TESTER_OBJECTS := $(patsubst %,$(OBJ)/%.o,$(TESTER_SOURCES))
 
 # Automatic dependency generation
 
-ifneq ($(filter-out clean bootroms libretro %.bin, $(MAKECMDGOALS)),)
+ifneq ($(filter-out clean bootroms libretro wasm %.bin, $(MAKECMDGOALS)),)
 -include $(CORE_OBJECTS:.o=.dep)
 ifneq ($(filter $(MAKECMDGOALS),sdl),)
 -include $(SDL_OBJECTS:.o=.dep)
@@ -347,8 +347,12 @@ $(BIN)/BootROMs/%.bin: BootROMs/%.asm $(OBJ)/BootROMs/SameBoyLogo.rle
 libretro:
 	$(MAKE) -C libretro
 
+# WASM core (uses its own build system)
+wasm:
+	$(MAKE) -C wasm
+
 # Clean
 clean:
 	rm -rf build
 
-.PHONY: libretro
+.PHONY: libretro wasm

wasm/Makefile

@@ -0,0 +1,124 @@
+# Make hacks
+.INTERMEDIATE:
+
+# Set target, configuration, version and destination folders
+
+PLATFORM := $(shell uname -s)
+ifneq ($(findstring MINGW,$(PLATFORM)),)
+PLATFORM := windows32
+USE_WINDRES := true
+endif
+
+ifneq ($(findstring MSYS,$(PLATFORM)),)
+PLATFORM := windows32
+endif
+
+ifeq ($(PLATFORM),windows32)
+_ := $(shell chcp 65001)
+endif
+
+DEFAULT := wasm
+default: $(DEFAULT)
+
+ifeq ($(MAKECMDGOALS),)
+MAKECMDGOALS := $(DEFAULT)
+endif
+
+CORE_DIR     += ..
+
+VERSION := 0.11.1
+export VERSION
+CONF ?= debug
+
+BIN := $(CORE_DIR)/build/wasm_bin
+OBJ := $(CORE_DIR)/build/wasm_obj
+BOOTROMS_DIR ?= $(BIN)/BootROMs
+
+ifdef DATA_DIR
+CFLAGS += -DDATA_DIR="\"$(DATA_DIR)\""
+endif
+
+# Set tools
+
+CC := emcc
+
+ifeq ($(PLATFORM),windows32)
+# To force use of the Unix version instead of the Windows version
+MKDIR := $(shell which mkdir)
+else
+MKDIR := mkdir
+endif
+
+ifeq ($(CONF),native_release)
+override CONF := release
+LDFLAGS += -march=native -mtune=native
+CFLAGS += -march=native -mtune=native
+endif
+
+# Set compilation and linkage flags based on target, platform and configuration
+
+CFLAGS += -Werror -Wall -Wno-strict-aliasing -Wno-unknown-warning -Wno-unknown-warning-option -Wno-multichar -Wno-int-in-bool-context -std=gnu11 -D_GNU_SOURCE -DVERSION="$(VERSION)" -I. -D_USE_MATH_DEFINES
+CFLAGS += -I$(CORE_DIR)
+WASM_LDFLAGS := -lopenal
+
+LDFLAGS += -lc -lm -ldl
+CFLAGS += -Wno-deprecated-declarations
+
+ifeq ($(CONF),debug)
+CFLAGS += -g
+else ifeq ($(CONF), release)
+CFLAGS += -O3 -DNDEBUG
+else
+$(error Invalid value for CONF: $(CONF). Use "debug", "release" or "native_release")
+endif
+
+# Define our targets
+
+wasm: $(BIN)/SameBoy.js
+all: wasm
+
+# Get a list of our source files and their respective object file targets
+
+CORE_SOURCES_RAW := $(shell ls $(CORE_DIR)/Core/*.c)
+CORE_SOURCES := $(shell realpath --relative-to=$(CORE_DIR) $(CORE_SOURCES_RAW))
+CORE_OBJECTS := $(patsubst %,$(OBJ)/%.o,$(CORE_SOURCES))
+
+WASM_SOURCES := $(shell ls *.c)
+WASM_OBJECTS := $(patsubst %,$(OBJ)/%.o,$(WASM_SOURCES))
+
+# Automatic dependency generation
+
+ifneq ($(filter-out clean %.bin, $(MAKECMDGOALS)),)
+-include $(CORE_OBJECTS:.o=.dep)
+ifneq ($(filter $(MAKECMDGOALS),wasm),)
+-include $(WASM_OBJECTS:.o=.dep)
+endif
+endif
+
+$(OBJ)/%.dep: %
+	-@$(MKDIR) -p $(dir $@)
+	$(CC) $(CFLAGS) -MT $(OBJ)/$^.o -M $^ -c -o $@
+
+$(CORE_DIR)/build/bin/BootROMs/%_boot.bin:
+	$(MAKE) -C $(CORE_DIR) $(patsubst $(CORE_DIR)/%,%,$@)
+
+# Compilation rules
+
+$(OBJ)/Core/%.c.o: $(CORE_DIR)/Core/%.c
+	-@$(MKDIR) -p $(dir $@)
+	$(CC) $(CFLAGS) -DGB_INTERNAL -c $< -o $@
+
+$(OBJ)/%.c.o: %.c
+	-@$(MKDIR) -p $(dir $@)
+	$(CC) $(CFLAGS) -c $< -o $@
+
+$(BIN)/SameBoy.js: $(CORE_OBJECTS) $(WASM_OBJECTS)
+	-@$(MKDIR) -p $(dir $@)
+	cp -r web/* $(BIN)
+	$(CC) -s WASM=1 $^ -o $@ $(LDFLAGS) $(WASM_LDFLAGS)
+ifeq ($(CONF), release)
+	strip $@
+endif
+
+clean:
+	rm -f $(WASM_OBJECTS) $(BIN)/SameBoy.js $(BIN)/SameBoy.wasm

wasm/main.c

@@ -0,0 +1,97 @@
+#include <emscripten.h>
+#include <stdbool.h>
+#include <stdio.h>
+#include <Core/gb.h>
+
+unsigned audio_sample_rate = 0;
+GB_gameboy_t gb;
+
+#define VIDEO_WIDTH 160
+#define VIDEO_HEIGHT 144
+#define VIDEO_PIXELS (VIDEO_WIDTH * VIDEO_HEIGHT)
+
+#define SGB_VIDEO_WIDTH 256
+#define SGB_VIDEO_HEIGHT 224
+#define SGB_VIDEO_PIXELS (SGB_VIDEO_WIDTH * SGB_VIDEO_HEIGHT)
+
+#define FRAME_RATE 0 // let the browser schedule (usually 60 FPS), if absolutely needed define as (0x400000 / 70224.0)
+
+static GB_model_t model;
+// static GB_model_t auto_model = GB_MODEL_CGB_C;
+
+static uint32_t pixel_buffer_1[256 * 224], pixel_buffer_2[256 * 224];
+static uint32_t *active_pixel_buffer = pixel_buffer_1;
+static uint32_t *previous_pixel_buffer = pixel_buffer_2;
+
+signed short soundbuf[1024 * 2];
+
+unsigned query_sample_rate_of_audiocontexts() {
+    return EM_ASM_INT({
+        var AudioContext = window.AudioContext || window.webkitAudioContext;
+        var ctx = new AudioContext();
+        var sr = ctx.sampleRate;
+        ctx.close();
+        return sr;
+    });
+}
+
+static void handle_events(GB_gameboy_t *gb) {
+    GB_set_key_state(gb, GB_KEY_START, true);
+}
+
+static void vblank(GB_gameboy_t *gb) {
+    if (1 == 1) {
+        // render_texture(active_pixel_buffer, previous_pixel_buffer);
+        uint32_t *temp = active_pixel_buffer;
+        active_pixel_buffer = previous_pixel_buffer;
+        previous_pixel_buffer = temp;
+        GB_set_pixels_output(gb, active_pixel_buffer);
+    }
+    else {
+        // render_texture(active_pixel_buffer, NULL);
+    }
+
+    handle_events(gb);
+}
+
+static uint32_t rgb_encode(GB_gameboy_t *gb, uint8_t r, uint8_t g, uint8_t b)
+{
+    return (r << 16) | (g << 8) | b;
+}
+
+
+void run() {
+    if (GB_is_inited(&gb)) {
+        GB_switch_model_and_reset(&gb, model);
+    }
+    else {
+        GB_init(&gb, model);
+
+        GB_set_vblank_callback(&gb, (GB_vblank_callback_t) vblank);
+        GB_set_pixels_output(&gb, active_pixel_buffer);
+        GB_set_rgb_encode_callback(&gb, rgb_encode);
+        GB_set_sample_rate(&gb, audio_sample_rate);
+        GB_set_color_correction_mode(&gb, GB_COLOR_CORRECTION_DISABLED); // TODO
+        GB_set_highpass_filter_mode(&gb, GB_HIGHPASS_OFF); // TODO
+        GB_set_rewind_length(&gb, 0);
+    }
+
+    GB_debugger_execute_command(&gb, "registers");
+}
+
+int main(int argc, char **argv)
+{
+#define str(x) #x
+#define xstr(x) str(x)
+    fprintf(stderr, "SameBoy v" xstr(VERSION) "\n");
+
+    audio_sample_rate = query_sample_rate_of_audiocontexts();
+
+    fprintf(stderr, "Sample rate: %u\n", audio_sample_rate);
+
+    emscripten_set_main_loop(
+        run, // our main loop
+        FRAME_RATE,
+        true // infinite loop
+    );
+}

wasm/web/index.html

@@ -0,0 +1,15 @@
+<!doctype html>
+<html>
+<head>
+	<meta charset="utf-8">
+	<title>SameBoy</title>
+</head>
+<body>
+	<script src="SameBoy.js"></script>
+	<script>
+		Module.onRuntimeInitialized = _ => {
+			console.log(Module)
+		};
+	</script>
+</body>
+</html>