mirror of https://github.com/sm64pc/sm64pc.git
107 lines
4.0 KiB
Python
107 lines
4.0 KiB
Python
"""
|
|
This module generates a fragment of C code, in the style of that found in
|
|
the ``model.inc.c`` files, that encodes the geometry of the model specified
|
|
by the Wavefront OBJ file.
|
|
|
|
Example:
|
|
Specify the path to the ``.obj`` file and pipe the output of the script
|
|
into the desired destination ``.c`` file.
|
|
|
|
$ python obj2c.py left_hand_closed.obj > left_hand_closed.inc.c
|
|
|
|
This is a work in progress and it currently has some serious limitations:
|
|
* It only encodes the geometry information of the OBJ file, so no
|
|
texture mapping or any other info.
|
|
* The generated fragment of C code has to be manually pasted into the
|
|
desired source file. Make sure that the name of the Gfx structure
|
|
you're pasting matches the one you're replacing.
|
|
* It hasn't been properly tested.
|
|
|
|
"""
|
|
|
|
def parse(filename):
|
|
from os.path import basename, splitext
|
|
from re import sub
|
|
|
|
# WARNIGN!
|
|
# `gfx_name` is just a guess. You have to manually check that the name
|
|
# of the Gfx structure you're pasting matches the one you're replacing.
|
|
clean = lambda fn: sub('\W|^(?=\d)','_', fn)
|
|
gfx_name = clean(splitext(basename(filename))[0])
|
|
gfx_vertices = []
|
|
gfx_normals = []
|
|
vertex_to_normal = {}
|
|
gfx_v_count = 0
|
|
|
|
vtx_name = ''
|
|
vtx_faces = []
|
|
vtx_v_count = 0
|
|
|
|
output_upper = []
|
|
output_lower = [f'const Gfx {gfx_name}[] = {{']
|
|
|
|
with open(filename, 'r') as obj:
|
|
for line in obj:
|
|
line = line.strip()
|
|
|
|
if line.startswith('v '):
|
|
coordinates = [eval(x) for x in line.split()[1:4]]
|
|
gfx_vertices.append(coordinates)
|
|
vtx_v_count += 1
|
|
gfx_v_count += 1
|
|
|
|
if line.startswith('vn '):
|
|
coordinates = [eval(x) for x in line.split()[1:4]]
|
|
gfx_normals.append([_encode_normal(x) for x in coordinates])
|
|
|
|
if line.startswith('g '):
|
|
vtx_name = line.split()[1]
|
|
|
|
if line.startswith('f '):
|
|
pairs = [pair.split('//') for pair in line.split()[1:4]]
|
|
vtx_faces.append([int(pair[0]) for pair in pairs])
|
|
for (x, y) in pairs:
|
|
vertex_to_normal[int(x) - 1] = int(y) - 1
|
|
|
|
if line.startswith('# ') and line.endswith('faces'):
|
|
output_upper.append(f'static const Vtx {vtx_name}[] = {{')
|
|
for i in range(gfx_v_count - vtx_v_count, gfx_v_count):
|
|
v_string = '[{}, {}, {}]'.format(*gfx_vertices[i])
|
|
n_string = '[{}, {}, {}, 0x00]'.format(*gfx_normals[vertex_to_normal[i]])
|
|
combined = f' [[{v_string}, 0, [0, 0], {n_string}]],'
|
|
output_upper.append(combined.replace('[', '{').replace(']', '}'))
|
|
|
|
output_upper.append('};\n')
|
|
output_lower.append(f' gsSPVertex({vtx_name}, {vtx_v_count}, 0),')
|
|
|
|
n = len(vtx_faces)
|
|
correction = vtx_v_count - gfx_v_count - 1
|
|
for i in range(int(n / 2)):
|
|
f1 = [vtx_faces[2 * i][j] + correction for j in range(3)]
|
|
f2 = [vtx_faces[2 * i + 1][j] + correction for j in range(3)]
|
|
output_lower.append(' gsSP2Triangles({}, {}, {}, 0x0, {}, {}, {}, 0x0),'.format(*f1, *f2))
|
|
|
|
if n % 2 != 0:
|
|
f3 = [vtx_faces[-1][j] + correction for j in range(3)]
|
|
output_lower.append(' gsSP1Triangle({}, {}, {}, 0x0),'.format(*f3))
|
|
|
|
vtx_v_count = 0
|
|
vtx_faces = []
|
|
|
|
output_lower.append(' gsSPEndDisplayList(),')
|
|
output_lower.append('};')
|
|
|
|
for line in output_upper + output_lower:
|
|
print(line)
|
|
|
|
def _encode_normal(x):
|
|
x *= 127
|
|
if x <= 0: x += 255
|
|
return hex(int(x))
|
|
|
|
if __name__ == "__main__":
|
|
import argparse
|
|
parser = argparse.ArgumentParser()
|
|
parser.add_argument('filename', help = 'filename of the .obj file to parse')
|
|
args = parser.parse_args()
|
|
parse(args.filename) |