Function encodeBytes

SHTest/Externals/meshoptimizer/vertexcodec.cpp:213–262

}

static unsigned char* encodeBytes(unsigned char* data, unsigned char* data_end, const unsigned char* buffer, size_t buffer_size)
{
	assert(buffer_size % kByteGroupSize == 0);

	unsigned char* header = data;

	// round number of groups to 4 to get number of header bytes
	size_t header_size = (buffer_size / kByteGroupSize + 3) / 4;

	if (size_t(data_end - data) < header_size)
		return NULL;

	data += header_size;

	memset(header, 0, header_size);

	for (size_t i = 0; i < buffer_size; i += kByteGroupSize)
	{
		if (size_t(data_end - data) < kByteGroupDecodeLimit)
			return NULL;

		int best_bits = 8;
		size_t best_size = encodeBytesGroupMeasure(buffer + i, 8);

		for (int bits = 1; bits < 8; bits *= 2)
		{
			size_t size = encodeBytesGroupMeasure(buffer + i, bits);

			if (size < best_size)
			{
				best_bits = bits;
				best_size = size;
			}
		}

		int bitslog2 = (best_bits == 1) ? 0 : (best_bits == 2 ? 1 : (best_bits == 4 ? 2 : 3));
		assert((1 << bitslog2) == best_bits);

		size_t header_offset = i / kByteGroupSize;

		header[header_offset / 4] |= bitslog2 << ((header_offset % 4) * 2);

		unsigned char* next = encodeBytesGroup(data, buffer + i, best_bits);

		assert(data + best_size == next);
		data = next;
	}

	return data;
}

static unsigned char* encodeVertexBlock(unsigned char* data, unsigned char* data_end, const unsigned char* vertex_data, size_t vertex_count, size_t vertex_size, unsigned char last_vertex[256])
{