71 lines
2.2 KiB
Python
71 lines
2.2 KiB
Python
import struct
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import vec3
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import obj
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import obj_state
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import sys
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normals = [
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(-1.0, 0.0, 0.0),
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(0.0, -1.0, 0.0),
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(0.0, 0.0, -1.0),
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(0.0, 0.0, 1.0),
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(0.0, 1.0, 0.0),
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(1.0, 0.0, 0.0),
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]
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def build_configuration_index_buffers(f, faces_by_normal):
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assert(set(normals) == set(faces_by_normal.keys()))
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offset = 0
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configuration_offsets = []
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for configuration in range(64):
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configuration_offsets.append(offset)
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for i in range(6):
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if (configuration & (1 << i)) == 0:
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continue
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normal = normals[i]
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indices = faces_by_normal[normal]
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for index in indices:
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f.write(struct.pack("<B", index))
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offset += 1
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for i, offset in enumerate(configuration_offsets):
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print(str(offset).rjust(4), end=", ")
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if i % 8 == 7:
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print()
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def build_vertex_buffer(f, vertex_buffer):
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for position, normal, texture in vertex_buffer:
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position = vec3.mul(position, 0.5)
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f.write(struct.pack("<eeeeeeee", *position, *normal, *texture))
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def write_indices(f, index_buffer, start, count):
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for i in range(count):
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f.write(struct.pack("<B", index_buffer[start + i]))
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def main():
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vertex_buffer = []
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index_buffer = []
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index_lookup = {}
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cube_state = obj.parse_obj_from_filename("cube.obj")
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obj_state.append_triangles(cube_state, vertex_buffer, index_buffer, index_lookup)
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cube_faces_by_normal = obj_state.build_faces_by_normal(vertex_buffer, index_buffer)
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tallgrass_index_start = len(index_buffer)
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tallgrass_state = obj.parse_obj_from_filename("tallgrass.obj")
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obj_state.append_triangles(tallgrass_state, vertex_buffer, index_buffer, index_lookup)
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tallgrass_index_count = len(index_buffer) - tallgrass_index_start
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print(tallgrass_index_start, tallgrass_index_count)
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with open("../configuration.idx", "wb") as f:
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build_configuration_index_buffers(f, cube_faces_by_normal)
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write_indices(f, index_buffer, tallgrass_index_start, tallgrass_index_count)
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with open("../per_vertex.vtx", "wb") as f:
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build_vertex_buffer(f, vertex_buffer)
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if __name__ == "__main__":
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main()
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