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CC := gcc
CFLAGS := -std=c11 -O2 -Wall -Wextra -Wno-unused-parameter -g -D_POSIX_C_SOURCE=200809L
LDFLAGS :=
SRCDIR := src
BUILD := build
# The native binary is every .c except the wasm host layer.
SRCS := $(filter-out $(SRCDIR)/wasm.c,$(wildcard $(SRCDIR)/*.c))
OBJS := $(patsubst $(SRCDIR)/%.c,$(BUILD)/%.o,$(SRCS))
BIN := $(BUILD)/sl0pboy
# ---- wasm ----
# Only the portable core plus the wasm host layer: render/kitty/control/main
# are terminal-and-POSIX bound and have no meaning in a browser.
# zig cc carries its own wasm backend, linker and wasi-libc, so there is no
# emscripten dependency. Reactor model = no main(), exports stay callable.
WASM_SRCS := $(addprefix $(SRCDIR)/,cpu.c ppu.c timer.c gb.c cart.c wasm.c)
WASM_OUT := web/sl0pboy.wasm
WASM_CC := zig cc
# --stack-size: zig defaults the wasm stack to 16MB, which lands in the
# module's *initial* memory - so every Game Boy on the page cost 16.25MB
# before running an instruction. The machine is a static and the C code has no
# deep recursion, so 256KB is plenty: 260 pages -> 8 pages per instance.
WASM_FLAGS := -target wasm32-wasi -mexec-model=reactor -O2 -std=c11 \
-Wall -Wextra -Wno-unused-parameter \
-Wl,--no-entry -Wl,--export-dynamic -Wl,--strip-all \
-Wl,-z,stack-size=262144
.PHONY: all clean run wasm
all: $(BIN)
wasm: $(WASM_OUT)
$(WASM_OUT): $(WASM_SRCS) $(wildcard $(SRCDIR)/*.h)
@mkdir -p $(dir $@)
$(WASM_CC) $(WASM_FLAGS) $(WASM_SRCS) -o $@
@echo "built $@ ($$(du -h $@ | cut -f1))"
$(BIN): $(OBJS)
$(CC) $(CFLAGS) $(OBJS) -o $@ $(LDFLAGS)
$(BUILD)/%.o: $(SRCDIR)/%.c | $(BUILD)
$(CC) $(CFLAGS) -c $< -o $@
$(BUILD):
mkdir -p $(BUILD)
clean:
rm -rf $(BUILD) $(WASM_OUT)
run: $(BIN)
$(BIN) $(ROM)
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