221 lines
7.7 KiB
Python
221 lines
7.7 KiB
Python
"""
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Convert fireball flight (2 frames) and explosion (5 frames) PNGs to VB tile arrays.
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Fireball flight: 32x32 px (4x4 tiles = 16 chars)
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Fireball explosion: 32x32 px (4x4 tiles = 16 chars)
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Output: src/vbdoom/assets/images/sprites/fireball/fireball_sprites.c + .h
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"""
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import os
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from PIL import Image
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SCRIPT_DIR = os.path.dirname(os.path.abspath(__file__))
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FLIGHT_DIR = os.path.join(SCRIPT_DIR, "make_into_4_colors_2", "converted", "frames", "fireball_2_anim")
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EXPLODE_DIR = os.path.join(SCRIPT_DIR, "make_into_4_colors_2", "converted", "frames", "fireball_explode")
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OUTPUT_DIR = os.path.join(SCRIPT_DIR, "src", "vbdoom", "assets", "images", "sprites", "fireball")
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PREVIEW_DIR = os.path.join(SCRIPT_DIR, "fireball_previews")
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TILE_SIZE = 8
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TARGET_W, TARGET_H = 32, 32
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TILES_X, TILES_Y = TARGET_W // TILE_SIZE, TARGET_H // TILE_SIZE
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TILES_PER_FRAME = TILES_X * TILES_Y # 16
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VB_PAL = {0: (0, 0, 0, 0), 1: (80, 0, 0, 255), 2: (170, 0, 0, 255), 3: (255, 0, 0, 255)}
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def luminance(r, g, b):
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return int(0.299 * r + 0.587 * g + 0.114 * b)
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def is_bg(r, g, b, a):
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if a < 128:
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return True
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if r < 15 and g < 15 and b < 15:
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return True
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return False
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def tile_to_vb_2bpp(tile):
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data = []
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for y in range(TILE_SIZE):
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u16_val = 0
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for x in range(TILE_SIZE):
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u16_val |= (tile[y][x] << (x * 2))
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data.append(u16_val & 0xFF)
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data.append((u16_val >> 8) & 0xFF)
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return data
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def bytes_to_u32(data):
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words = []
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for i in range(0, len(data), 4):
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w = data[i] | (data[i+1] << 8) | (data[i+2] << 16) | (data[i+3] << 24)
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words.append(w)
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return words
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def convert_frame(img_path, target_w, target_h):
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"""Load PNG, scale to target, convert to VB palette, return u32 tile array."""
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img = Image.open(img_path).convert('RGBA')
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w, h = img.size
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# Find bounding box
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pix = img.load()
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min_x, min_y, max_x, max_y = w, h, 0, 0
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for y in range(h):
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for x in range(w):
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r, g, b, a = pix[x, y]
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if not is_bg(r, g, b, a):
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min_x = min(min_x, x)
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min_y = min(min_y, y)
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max_x = max(max_x, x)
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max_y = max(max_y, y)
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if max_x < min_x:
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# Fully transparent frame
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return [0] * (target_w * target_h // (TILE_SIZE * TILE_SIZE) * 4)
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crop = img.crop((min_x, min_y, max_x + 1, max_y + 1))
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cw, ch = crop.size
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scale = min(target_w / cw, target_h / ch)
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nw = max(1, int(cw * scale))
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nh = max(1, int(ch * scale))
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resized = crop.resize((nw, nh), Image.LANCZOS)
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# Center on canvas
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canvas = [[0] * target_w for _ in range(target_h)]
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off_x = (target_w - nw) // 2
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off_y = (target_h - nh) // 2
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rpix = resized.load()
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for y in range(nh):
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for x in range(nw):
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r, g, b, a = rpix[x, y]
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dx, dy = off_x + x, off_y + y
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if dx < target_w and dy < target_h:
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if is_bg(r, g, b, a):
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canvas[dy][dx] = 0
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else:
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gray = luminance(r, g, b)
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if gray < 85:
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canvas[dy][dx] = 1
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elif gray < 170:
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canvas[dy][dx] = 2
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else:
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canvas[dy][dx] = 3
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# Slice into tiles
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tiles_x = target_w // TILE_SIZE
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tiles_y = target_h // TILE_SIZE
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all_u32 = []
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for tr in range(tiles_y):
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for tc in range(tiles_x):
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tile = []
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for y in range(TILE_SIZE):
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row = []
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for x in range(TILE_SIZE):
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row.append(canvas[tr * TILE_SIZE + y][tc * TILE_SIZE + x])
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tile.append(row)
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all_u32.extend(bytes_to_u32(tile_to_vb_2bpp(tile)))
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return all_u32
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def save_preview(canvas, target_w, target_h, name):
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os.makedirs(PREVIEW_DIR, exist_ok=True)
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prev = Image.new('RGBA', (target_w * 4, target_h * 4), (0, 0, 0, 255))
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pp = prev.load()
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for y in range(target_h):
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for x in range(target_w):
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c = VB_PAL.get(canvas[y][x], (0, 0, 0, 255))
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for sy in range(4):
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for sx in range(4):
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pp[x*4+sx, y*4+sy] = c
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prev.save(os.path.join(PREVIEW_DIR, f"{name}.png"))
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def main():
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os.makedirs(OUTPUT_DIR, exist_ok=True)
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# Collect all frames
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flight_frames = sorted([f for f in os.listdir(FLIGHT_DIR)
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if f.endswith('.png') and not f.startswith('_')])
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explode_frames = sorted([f for f in os.listdir(EXPLODE_DIR)
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if f.endswith('.png') and not f.startswith('_')])
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print(f"Flight frames: {len(flight_frames)}")
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print(f"Explosion frames: {len(explode_frames)}")
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all_arrays = [] # (name, u32_data, type)
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for i, fname in enumerate(flight_frames):
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path = os.path.join(FLIGHT_DIR, fname)
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u32_data = convert_frame(path, TARGET_W, TARGET_H)
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name = f"fireball_flight_{i:03d}"
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all_arrays.append((name, u32_data, 'flight'))
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print(f" Converted {fname} -> {name} ({len(u32_data)} u32 words)")
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for i, fname in enumerate(explode_frames):
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path = os.path.join(EXPLODE_DIR, fname)
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u32_data = convert_frame(path, TARGET_W, TARGET_H)
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name = f"fireball_explode_{i:03d}"
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all_arrays.append((name, u32_data, 'explode'))
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print(f" Converted {fname} -> {name} ({len(u32_data)} u32 words)")
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# Write C file
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c_path = os.path.join(OUTPUT_DIR, "fireball_sprites.c")
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with open(c_path, 'w') as f:
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f.write("/* Fireball sprites -- auto-generated by prepare_fireball_sprites.py */\n\n")
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f.write('#include "fireball_sprites.h"\n\n')
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for name, u32_data, _ in all_arrays:
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f.write(f"const unsigned int {name}Tiles[{len(u32_data)}]"
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f" __attribute__((aligned(4))) =\n{{\n")
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for j in range(0, len(u32_data), 8):
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chunk = u32_data[j:j+8]
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s = ",".join(f"0x{w:08X}" for w in chunk)
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comma = "," if j + 8 < len(u32_data) else ""
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f.write(f"\t{s}{comma}\n")
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f.write("};\n\n")
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print(f"Wrote {c_path}")
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# Write header
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words_per_frame = TILES_PER_FRAME * 4 # 16 tiles * 4 u32 per tile = 64
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flight_count = len([a for a in all_arrays if a[2] == 'flight'])
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explode_count = len([a for a in all_arrays if a[2] == 'explode'])
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h_path = os.path.join(OUTPUT_DIR, "fireball_sprites.h")
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with open(h_path, 'w') as f:
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f.write("#ifndef __FIREBALL_SPRITES_H__\n")
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f.write("#define __FIREBALL_SPRITES_H__\n\n")
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f.write("/*\n")
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f.write(f" * Fireball sprites ({TARGET_W}x{TARGET_H} px, {TILES_X}x{TILES_Y} tiles)\n")
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f.write(f" * Flight frames: {flight_count}\n")
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f.write(f" * Explosion frames: {explode_count}\n")
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f.write(f" * Tiles per frame: {TILES_PER_FRAME} ({words_per_frame} u32 words = {words_per_frame*4} bytes)\n")
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f.write(" */\n\n")
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for name, u32_data, _ in all_arrays:
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f.write(f"extern const unsigned int {name}Tiles[{len(u32_data)}];\n")
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f.write(f"\n#define FIREBALL_FLIGHT_COUNT {flight_count}\n")
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f.write(f"#define FIREBALL_EXPLODE_COUNT {explode_count}\n")
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f.write(f"#define FIREBALL_FRAME_BYTES {words_per_frame * 4}\n\n")
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f.write("static const unsigned int* const FIREBALL_FLIGHT_FRAMES[] = {\n")
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for name, _, typ in all_arrays:
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if typ == 'flight':
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f.write(f" {name}Tiles,\n")
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f.write("};\n\n")
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f.write("static const unsigned int* const FIREBALL_EXPLODE_FRAMES[] = {\n")
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for name, _, typ in all_arrays:
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if typ == 'explode':
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f.write(f" {name}Tiles,\n")
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f.write("};\n\n")
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f.write("#endif\n")
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print(f"Wrote {h_path}")
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if __name__ == "__main__":
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main()
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