mirror of https://github.com/AxioDL/metaforce.git
100 lines
3.1 KiB
Python
100 lines
3.1 KiB
Python
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'''
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HMDL Export Blender Addon
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By Jack Andersen <jackoalan@gmail.com>
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This file provides the means to generate an RGBA TXTR resource
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buffer for packaging into an .hlpk (yes, I know this is slow,
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but it's very flexible and supports Blender's procedural textures)
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'''
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from mathutils import Vector
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import struct
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def count_bits(num):
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accum = 0
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index = 0
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for i in range(32):
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if ((num >> i) & 1):
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accum += 1
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index = i
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return accum, index
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def make_txtr(tex, size=(512,512)):
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if tex.type == 'IMAGE':
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size = tex.image.size
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# Validate image for mipmapping
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can_mipmap = False
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w_bits, w_idx = count_bits(size[0])
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h_bits, h_idx = count_bits(size[1])
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if w_bits == 1 and h_bits == 1 and tex.use_mipmap:
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can_mipmap = True
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# Main image 2D array
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main_array = []
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for y in range(size[1]):
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row = []
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main_array.append(row)
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for x in range(size[0]):
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texel = tex.evaluate((x * 2 / size[0] - 1.0, y * 2 / size[1] - 1.0, 0))
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row.append(texel)
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# Count potential mipmap levels
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series_count = 1
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if can_mipmap:
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if size[0] > size[1]:
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series_count = w_idx + 1
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else:
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series_count = h_idx + 1
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# Make header
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tex_bytes = struct.pack('IHHI', 0, size[0], size[1], series_count)
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# Initial mipmap level
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for y in main_array:
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for x in y:
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tex_bytes += struct.pack('BBBB',
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min(255, int(x[0]*256)),
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min(255, int(x[1]*256)),
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min(255, int(x[2]*256)),
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min(255, int(x[3]*256)))
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# Prepare mipmap maker
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if can_mipmap:
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# Box filter
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prev_array = main_array
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for i in range(series_count - 1):
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new_array = []
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for y in range(max(len(prev_array) // 2, 1)):
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y1 = prev_array[y*2]
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if len(prev_array) > 1:
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y2 = prev_array[y*2+1]
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else:
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y2 = prev_array[y*2]
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new_row = []
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new_array.append(new_row)
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for x in range(max(len(y1) // 2, 1)):
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texel_val = Vector((0,0,0,0))
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texel_val += y1[x*2]
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texel_val += y2[x*2]
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if len(y1) > 1:
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texel_val += y1[x*2+1]
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texel_val += y2[x*2+1]
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else:
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texel_val += y1[x*2]
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texel_val += y2[x*2]
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texel_val /= 4
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new_row.append(texel_val)
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tex_bytes += struct.pack('BBBB',
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min(255, int(texel_val[0]*256)),
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min(255, int(texel_val[1]*256)),
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min(255, int(texel_val[2]*256)),
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min(255, int(texel_val[3]*256)))
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prev_array = new_array
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return tex_bytes
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