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decode_pvrt: add support for non-square textures

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This commit is contained in:
Zack Buhman 2025-11-22 21:50:31 -06:00
parent 742448e7a7
commit ed66e93e07
1 changed files with 43 additions and 6 deletions
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49
gen/k_means/python/decode_pvrt.py
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@ -28,7 +28,7 @@ def parse_pvrt_header(buf):
print(hex(texture_type)) print(hex(texture_type))
print(width) print(width)
print(height) print(height)
assert len(indices) + len(codebook) == texture_data_size - 8 #assert len(indices) + len(codebook) == texture_data_size - 8, (len(indices) + len(codebook), texture_data_size - 8)
#assert len(indices) == width * height / 4, (len(indices), width * height / 4) #assert len(indices) == width * height / 4, (len(indices), width * height / 4)
return PVRT( return PVRT(
texture_data_size, texture_data_size,
@ -51,20 +51,57 @@ def get_colors(buf, codebook_ix):
colors = struct.unpack('<HHHH', codeword) colors = struct.unpack('<HHHH', codeword)
return list(map(rgb24, colors)) return list(map(rgb24, colors))
def from_xy(x, y): def log2(n):
if n == 8:
return 3
if n == 16:
return 4
if n == 32:
return 5
if n == 64:
return 6
if n == 128:
return 7
if n == 256:
return 8
if n == 512:
return 9
if n == 1024:
return 10
assert False, n
def from_xy(x, y, width, height):
# maximum texture size : 1024x1024
# maximum 1-dimensional index: 0xfffff
# bits : 19-0
# y bits: 0, 2, 4, 6, 8, 10, 12, 14, 16, 18
# x bits: 1, 3, 5, 7, 9, 11, 13, 15, 17, 19
width_max = log2(width);
height_max = log2(height);
twiddle_ix = 0 twiddle_ix = 0
i = 0 i = 0
while i <= (20 / 2): while i < (20 / 2):
twiddle_ix |= ((y >> i) & 1) << (i * 2 + 0) if i < width_max and i < height_max:
twiddle_ix |= ((x >> i) & 1) << (i * 2 + 1) twiddle_ix |= ((y >> i) & 1) << (i * 2 + 0)
twiddle_ix |= ((x >> i) & 1) << (i * 2 + 1)
elif i < width_max:
twiddle_ix |= ((x >> i) & 1) << (i + height_max)
elif i < height_max:
twiddle_ix |= ((y >> i) & 1) << (i + width_max)
else:
break
i += 1 i += 1
return twiddle_ix return twiddle_ix
def decode_vq_indices(codebook, indices, width, height): def decode_vq_indices(codebook, indices, width, height):
canvas = [0] * width * height canvas = [0] * width * height
for ty in range(height // 2): for ty in range(height // 2):
for tx in range(width // 2): for tx in range(width // 2):
codebook_ix = indices[from_xy(tx, ty)] codebook_ix = indices[from_xy(tx, ty, width, height)]
codeword = get_colors(codebook, codebook_ix) codeword = get_colors(codebook, codebook_ix)
ai = ((ty * 2) + 0) * width + ((tx * 2) + 0) ai = ((ty * 2) + 0) * width + ((tx * 2) + 0)
bi = ((ty * 2) + 1) * width + ((tx * 2) + 0) bi = ((ty * 2) + 1) * width + ((tx * 2) + 0)