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Implement NUFLI delta encoding with scanlines

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- Add tools/apply_scanlines.py for CRT scanline effect
- Add tools/nufli_delta.py for delta encoding (base + bitmask deltas)
- Delta format: 2880 byte bitmask + N byte values per screen
- 40.1% size reduction vs raw NUFLI (69KB vs 115KB for 5 screens)
- Base (23KB) at 000-FFF, title delta (7KB) at -
- Other deltas use title as fallback (TODO: disk loading)
- Update tasks.md with scanline and delta encoding documentation
This commit is contained in:
mr.one
2026-07-19 00:12:37 +02:00
parent 1d7554cd39
commit f4b344cccd
22 changed files with 426 additions and 125 deletions
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Makefile
+25 -20
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@@ -148,39 +148,44 @@ NUFLI_SCREENS := screen_title screen_waiting1 screen_waiting_2 screen_win_hare s
# Generated files
NUFLI_NUF_FILES := $(addprefix $(NUFLI_OUT_DIR)/,$(addsuffix .nuf,$(NUFLI_SCREENS)))
NUFLI_ASM_FILES := $(addprefix $(NUFLI_OUT_DIR)/,$(addsuffix .asm,$(NUFLI_SCREENS)))
NUFLI_HDR_FILES := $(addprefix $(NUFLI_OUT_DIR)/,$(addsuffix .h,$(NUFLI_SCREENS)))
NUFLI_DELTA_FILES := $(addprefix $(NUFLI_OUT_DIR)/,$(addsuffix .delta,$(NUFLI_SCREENS)))
NUFLI_BASE_FILE := $(NUFLI_OUT_DIR)/nufli_base.base
# Build all NUFLI images
nufli: $(NUFLI_ASM_FILES) $(NUFLI_HDR_FILES)
@echo "NUFLI images built in $(NUFLI_OUT_DIR)/"
# Build all NUFLI images (delta encoded)
nufli: $(NUFLI_BASE_FILE) $(NUFLI_DELTA_FILES)
@echo "NUFLI delta-encoded images built in $(NUFLI_OUT_DIR)/"
@ls -la $(NUFLI_BASE_FILE) $(NUFLI_DELTA_FILES) | awk '{print $$5, $$9}'
# Clean NUFLI artifacts
nufli-clean:
@rm -f $(NUFLI_OUT_DIR)/*.nuf $(NUFLI_OUT_DIR)/*.asm $(NUFLI_OUT_DIR)/*.h
@rm -f $(NUFLI_OUT_DIR)/*.bmp
@rm -f $(NUFLI_OUT_DIR)/*.nuf $(NUFLI_OUT_DIR)/*.delta $(NUFLI_OUT_DIR)/*.base
@rm -f $(NUFLI_OUT_DIR)/*.bmp $(NUFLI_OUT_DIR)/*.asm $(NUFLI_OUT_DIR)/*.h
@echo "cleaned NUFLI images"
# PNG → BMP (Mufflon needs BMP input)
$(NUFLI_OUT_DIR)/%.bmp: $(NUFLI_SRC_DIR)/%.png | ensure-build-dir
# Explicit rules for each screen (no pattern chain, no intermediate files)
# Apply scanlines: darken every other row for CRT effect + smaller NUFLI output
define NUFLI_RULES
$(NUFLI_OUT_DIR)/$(1).bmp: $(NUFLI_SRC_DIR)/$(1).png | ensure-build-dir
@mkdir -p $(NUFLI_OUT_DIR)
@echo "converting $< -> $@"
@python3 -c "from PIL import Image; Image.open('$<').resize((320,200), Image.LANCZOS).save('$@')"
@echo "converting $$< -> $$@ (with scanlines)"
@python3 $(TOOLS_DIR)/apply_scanlines.py $$< $$@
# BMP → NUFLI (.nuf)
$(NUFLI_OUT_DIR)/%.nuf: $(NUFLI_OUT_DIR)/%.bmp | ensure-mufflon
@echo "converting $< -> $@"
@$(MUFFLON_BIN) $< -o $@ --shutup
$(NUFLI_OUT_DIR)/$(1).nuf: $(NUFLI_OUT_DIR)/$(1).bmp | ensure-mufflon
@echo "converting $$< -> $$@"
@$(MUFFLON_BIN) $$< -o $$@ --shutup
endef
# NUFLI → Assembly (.asm + .h)
$(NUFLI_OUT_DIR)/%.asm $(NUFLI_OUT_DIR)/%.h: $(NUFLI_OUT_DIR)/%.nuf
@echo "converting $< -> $@ + $(basename $@).h"
@python3 $(TOOLS_DIR)/nuf_to_asm.py $< $(NUFLI_OUT_DIR)/$*
$(foreach screen,$(NUFLI_SCREENS),$(eval $(call NUFLI_RULES,$(screen))))
# Delta encoding: all .nuf files -> base + per-screen deltas
$(NUFLI_BASE_FILE) $(NUFLI_DELTA_FILES) &: $(NUFLI_NUF_FILES)
@echo "delta encoding $(words $(NUFLI_NUF_FILES)) screens..."
@python3 $(TOOLS_DIR)/nufli_delta.py $(NUFLI_OUT_DIR)/nufli_base $(NUFLI_NUF_FILES)
# ============================================================
# $(PRG) — compile main.c → nyuller.prg
# ============================================================
$(PRG): $(SRC_FILES) $(HDR_FILES) $(NUFLI_ASM_FILES) | ensure-build-dir ensure-oscar64
$(PRG): $(SRC_FILES) $(HDR_FILES) $(NUFLI_BASE_FILE) $(NUFLI_DELTA_FILES) | ensure-build-dir ensure-oscar64
@echo "compiling $(SRC) with $(OSCAR64_BIN) -> $(BUILD_DIR)/"
cd "$(SRC_DIR)" && "$(OSCAR64_BIN)" -i="$(OSCAR64_DIR)/include" -o="$(PRG)" $(OPT_FLAGS) "$(SRC)"