tools: switch tileset storage format to 2 bits per pixel

Makefile

@@ -9,7 +9,7 @@ DEP = $(patsubst %.o,%.d,$(SRC))
 res = $(subst pokered/,res/,$(patsubst %.$(1),%.$(1).o,$(wildcard $(2)*.$(1))))
 res_png = $(subst pokered/,res/,$(patsubst %.png,%.$(1).o,$(wildcard $(2)*.png)))
 
-GFX_TILESETS = $(call res_png,4bpp,pokered/gfx/tilesets/)
+GFX_TILESETS = $(call res_png,2bpp,pokered/gfx/tilesets/)
 GFX_BLOCKSETS = $(call res,bst,pokered/gfx/blocksets/)
 MAPS_BLOCKS = $(call res,blk,pokered/maps/)
 
@@ -28,14 +28,14 @@ endef
 
 generated: $(GENERATED)
 
-res/%.4bpp: pokered/%.png
+res/%.2bpp: pokered/%.png
 	@mkdir -p $(dir $@)
-	python tools/png_to_4bpp.py $< $@
+	python tools/png_to_nbpp.py $< 2 $@
 
-%.4bpp.h:
+%.2bpp.h:
 	$(BUILD_BINARY_H)
 
-%.4bpp.o: %.4bpp %.4bpp.h
+%.2bpp.o: %.2bpp %.2bpp.h
 	$(BUILD_BINARY_O)
 
 res/%.blk: pokered/%.blk

main.cpp

@@ -23,12 +23,28 @@ void palette_data()
 uint32_t cell_data(const start_size_t& buf, const uint32_t top)
 {
   // round to nearest multiple of 32
-  const uint32_t table_size = (buf.size + 0x20 - 1) & (-0x20);
+  const uint32_t table_size = ((buf.size * 2) + 0x20 - 1) & (-0x20);
   const uint32_t base_address = top - table_size; // in bytes
 
-  copy<uint32_t>(&vdp2.vram.u32[(base_address / 4)],
-                 reinterpret_cast<uint32_t const * const>(buf.start),
-                 buf.size);
+  uint32_t * vram = &vdp2.vram.u32[(base_address / 4)];
+  for (uint32_t ix = 0; ix < buf.size / 4; ix += 1) {
+    const uint32_t pixels = reinterpret_cast<uint32_t const * const>(buf.start)[ix];
+    const uint32_t px0 = pixels >> 16 & 0xffff;
+    const uint32_t px1 = pixels >> 0  & 0xffff;
+
+#define lshift(n) ((7 - n) * 2)
+#define rshift(n) ((7 - n) * 4)
+#define px(p, n) (((p >> lshift(n)) & 0b11) << rshift(n))
+#define p0(n) (px(px0, n))
+#define p1(n) (px(px1, n))
+    vram[ix * 2 + 0] = p0(7) | p0(6) | p0(5) | p0(4) | p0(3) | p0(2) | p0(1) | p0(0);
+    vram[ix * 2 + 1] = p1(7) | p1(6) | p1(5) | p1(4) | p1(3) | p1(2) | p1(1) | p1(0);
+#undef p1
+#undef p0
+#undef px
+#undef lshift
+#undef rshift
+  }
 
   return base_address;
 }
@@ -115,7 +131,7 @@ void main()
   vdp2.reg.MPABN0 = MPABN0__N0MPB(0) | MPABN0__N0MPA(plane_a); // bits 5~0
   vdp2.reg.MPCDN0 = MPABN0__N0MPD(0) | MPABN0__N0MPC(0); // bits 5~0
 
-  uint32_t top = (sizeof (union vdp2_vram));// - ((sizeof (union vdp2_vram)) / 8);
+  uint32_t top = (sizeof (union vdp2_vram));
   palette_data();
   uint32_t base_address = top = cell_data(tilesets[tileset_t::overworld].tileset, top);
   uint32_t base_pattern = base_address / 32;

tools/generate/__main__.py

@@ -1,22 +1,178 @@
+from pathlib import Path
 from pprint import pprint
+import io
 
 from parse import parse
 
+def sorted_map_headers():
+    # hack to remove unused/duplicate underground_path_route_7
+    map_headers = sorted(parse.map_headers, key=lambda m: m.name2)
+    return filter(lambda m: m.name1 != "UndergroundPathRoute7Copy", map_headers)
+
+def includes():
+    for map_header in sorted_map_headers():
+        block_path = parse.maps_blocks_list[map_header.blocks()]
+        yield f'#include "res/{block_path}.h"'
+    for tileset_name in sorted(parse.tileset_constants_list):
+        tileset_index  = parse.tileset_constants_list[tileset_name]
+        tileset_header = parse.tileset_headers_list[tileset_index]
+
+        blockset_path = parse.gfx_tilesets_list[tileset_header.blockset()]
+        gfx_path      = parse.gfx_tilesets_list[tileset_header.gfx()]
+
+        yield f'#include "res/{blockset_path}.h"'
+        yield f'#include "res/{gfx_path}.h"'
+    yield ""
+
+def struct_start_size_t():
+    return [
+        "struct start_size_t {",
+            "uint8_t const * const start;",
+            "uint32_t size;",
+        "};",
+    ]
+
+def struct_tileset_t():
+    tileset_names = (
+        f"{name.lower()},"
+        for name in sorted(parse.tileset_constants_list)
+    )
+    return [
+        "struct tileset_t {",
+            "start_size_t blockset;",
+            "start_size_t tileset;",
+            "",
+            "enum tileset {",
+                *tileset_names,
+            "};",
+        "};",
+    ]
+
+def struct_map_t():
+    map_names = (
+        f"{map_header.name2.lower()},"
+        for map_header in sorted_map_headers()
+    )
+    return [
+        "struct map_t {",
+            "start_size_t blocks;",
+            "enum tileset_t::tileset tileset;",
+            "uint32_t width;",
+            "uint32_t height;",
+            "",
+            "enum map {",
+                *map_names,
+            "};",
+        "};",
+    ]
+
+def binary_res(path, suffix):
+    # _binary_res_gfx_blocksets_overworld_bst_start
+    name = path.replace('/', '_').replace('.', '_')
+    return f"_binary_res_{name}_{suffix}"
+
+def start_size_value(path):
+    start = binary_res(path, "start")
+    size = binary_res(path, "size")
+
+    return [
+        f"reinterpret_cast<uint8_t*>(&{start}),",
+        f"reinterpret_cast<uint32_t>(&{size}),",
+    ]
+
+def blockset_tileset(name: str):
+    tileset_index  = parse.tileset_constants_list[name]
+    tileset_header = parse.tileset_headers_list[tileset_index]
+
+    blockset_path = parse.gfx_tilesets_list[tileset_header.blockset()]
+    gfx_path      = parse.gfx_tilesets_list[tileset_header.gfx()]
+
+    return [
+        f"[tileset_t::{name.lower()}] = {{",
+            ".blockset = {",
+                *start_size_value(blockset_path),
+            "},",
+            ".tileset = {",
+                *start_size_value(gfx_path),
+            "}",
+        "},"
+    ]
+
+def tilesets():
+    yield "const tileset_t tilesets[] = {"
+    for tileset in sorted(parse.tileset_constants_list):
+        yield from blockset_tileset(tileset)
+    yield "};"
+
+def map(map_header):
+    block_path = parse.maps_blocks_list[map_header.blocks()]
+    map_constant = parse.map_constants_list[map_header.name2]
+    return [
+        f"[map_t::{map_header.name2.lower()}] = {{",
+            ".blocks = {",
+                *start_size_value(block_path),
+            "},",
+            f".tileset = tileset_t::{map_header.tileset.lower()},",
+            f".width = {map_constant.width},",
+            f".height = {map_constant.height},",
+        "},",
+    ]
+
+def maps():
+    yield "const map_t maps[] = {"
+    for map_header in sorted_map_headers():
+        yield from map(map_header)
+    yield "};"
+
+def _render(out, lines):
+    indent = " "
+    level = 0
+    for l in lines:
+        if l and l[0] == "}":
+            level -= 2
+            assert level >= 0, out.getvalue()
+
+        out.write(indent * level + l + "\n")
+
+        if l and l[-1] == "{":
+            level += 2
+
+        if level == 0 and l and l[-1] == ";":
+            out.write("\n")
+    return out
+
+def renderer():
+    out = io.StringIO()
+    def render(lines):
+        return _render(out, lines)
+    return render, out
+
 def generate():
-    pprint(parse.maps_blocks_list)
+    #pprint(parse.maps_blocks_list)
     #pprint(parse.map_headers)
     #pprint(parse.tileset_constants_list)
     #pprint(parse.tileset_headers_list)
     #pprint(parse.gfx_tilesets_list)
+    render, out = renderer()
+
+    render(includes())
+    render(struct_start_size_t())
+    render(struct_tileset_t())
+    render(struct_map_t())
+    render(tilesets())
+    render(maps())
+
+    print(out.getvalue(), end='')
 
 generate()
 
 """
 map_headers[0].tileset == 'OVERWORLD'
-map_headers[0].width() == 'PALLET_TOWN_WIDTH'
-map_headers[0].height() == 'PALLET_TOWN_HEIGHT'
+map_headers[0].name1 = 'PalletTown'
+map_headers[0].name2 = 'PALLET_TOWN'
 map_headers[0].blocks() == 'PalletTown_Blocks'
-maps_blocks['PalletTown_Blocks'] == 'maps/PalletTown.blk'
+map_constants_list['PALLET_TOWN'] == MapConstant(10, 19)
+maps_blocks_list['PalletTown_Blocks'] == 'maps/PalletTown.blk'
 tileset_constants_list['OVERWORLD'] == 0
 tileset_headers_list[0].name == 'Overworld'
 tileset_headers_list[0].blockset() == 'Overworld_Block'

tools/parse/map_constants.py

@@ -12,7 +12,6 @@ def tokenize_lines(lines):
 
 @dataclass
 class MapConstant:
-    name: str
     width: int
     height: int
 
@@ -20,8 +19,7 @@ def flatten(tokens):
     for macro, args in tokens:
         if macro == 'map_const':
             name, width, height = args
-            yield MapConstant(
-                name,
+            yield name, MapConstant(
                 int(width),
                 int(height)
             )
@@ -30,4 +28,7 @@ def parse(prefix):
     path = prefix / "constants/map_constants.asm"
     with open(path) as f:
         tokens = tokenize_lines(f.read().split("\n"))
-        return list(flatten(tokens))
+        l = list(flatten(tokens))
+        d = dict(l)
+        assert len(l) == len(d)
+        return d

tools/png_to_4bpp.py

@@ -1,39 +0,0 @@
-import sys
-
-from PIL import Image
-
-def two_bpp_index(px):
-    indices = {0x00: 0, 0x55: 1, 0xaa: 2, 0xff: 3}
-    assert px in indices, px
-    return indices[px]
-
-def convert(image):
-    assert image.mode == 'L', image.mode
-    width, height = image.size
-
-    buf = bytearray(width * height // 2)
-
-    for cell_y in range(height//8):
-        for cell_x in range(width//8):
-            for y in range(8):
-                for x in range(8):
-                    px = im.getpixel((cell_x * 8 + x, cell_y * 8 + y))
-                    index = two_bpp_index(px)
-                    buf_ix = x//2 + (4 * (cell_x * 8 + (cell_y * width) + y))
-                    buf[buf_ix] |= (index << 4 * (1 - (x % 2)))
-    return buf
-
-def debug(buf):
-    for row in range(len(buf) // 4):
-        for x in range(4):
-            px = buf[row * 4 + x]
-            print((px >> 4) & 0xf, end='')
-            print((px >> 0) & 0xf, end='')
-        print()
-        if (row % 8 == 7):
-            print()
-
-im = Image.open(sys.argv[1])
-buf = convert(im)
-with open(sys.argv[2], 'wb') as f:
-    f.write(buf)

tools/png_to_nbpp.py

@@ -0,0 +1,59 @@
+import os
+import sys
+
+from PIL import Image
+
+def intensity_to_index(px):
+    indices = {0x00: 0, 0x55: 1, 0xaa: 2, 0xff: 3}
+    assert px in indices, px
+    return indices[px]
+
+def convert(image, bpp):
+    assert bpp in {8, 4, 2}, bpp
+    px_per_byte = 8 // bpp
+    px_per_row = 8
+    bits_per_byte = 8
+    bytes_per_row = (px_per_row // (bits_per_byte // bpp))
+
+    assert image.mode == 'L', image.mode
+    width, height = image.size
+
+    buf = bytearray(width * height // px_per_byte)
+
+    for cell_y in range(height//8):
+        for cell_x in range(width//8):
+            for y in range(8):
+                for x in range(8):
+                    px = im.getpixel((cell_x * 8 + x, cell_y * 8 + y))
+                    index = intensity_to_index(px)
+                    buf_ix = x//px_per_byte + (bytes_per_row * (cell_x * 8 + (cell_y * width) + y))
+                    buf[buf_ix] |= (index << bpp * ((px_per_byte - 1) - (x % px_per_byte)))
+    return buf
+
+def debug(buf, bpp):
+    assert bpp in {8, 4, 2}, bpp
+    px_per_byte = 8 // bpp
+    px_per_row = 8
+    bits_per_byte = 8
+    bytes_per_row = (px_per_row // (bits_per_byte // bpp))
+    bit_mask = (2 ** bpp) - 1
+
+    for row in range(len(buf) // bytes_per_row):
+        for x in range(bytes_per_row):
+            px = buf[row * bytes_per_row + x]
+            for shift in reversed(range(0, px_per_row, bpp)):
+                print((px >> shift) & bit_mask, end='')
+        print()
+        if (row % 8 == 7):
+            print()
+
+in_path = sys.argv[1]
+bpp = int(sys.argv[2])
+out_path = sys.argv[3]
+
+im = Image.open(in_path)
+buf = convert(im, bpp)
+if 'NBPP_DEBUG' in os.environ:
+    debug(buf, bpp)
+with open(out_path, 'wb') as f:
+    f.write(buf)