Method compute_slice_crcs

engine/dlib/src/basis/encoder/basisu_backend.cpp:619–681

	}

	void basisu_backend::compute_slice_crcs()
	{
		for (uint32_t slice_index = 0; slice_index < m_slices.size(); slice_index++)
		{
			//const uint32_t first_block_index = m_slices[slice_index].m_first_block_index;
			const uint32_t width = m_slices[slice_index].m_width;
			const uint32_t height = m_slices[slice_index].m_height;
			const uint32_t num_blocks_x = m_slices[slice_index].m_num_blocks_x;
			const uint32_t num_blocks_y = m_slices[slice_index].m_num_blocks_y;

			gpu_image gi;
			gi.init(texture_format::cETC1, width, height);

			for (uint32_t block_y = 0; block_y < num_blocks_y; block_y++)
			{
				for (uint32_t block_x = 0; block_x < num_blocks_x; block_x++)
				{
					//const uint32_t block_index = first_block_index + block_x + block_y * num_blocks_x;

					encoder_block& m = m_slice_encoder_blocks[slice_index](block_x, block_y);

					{
						etc_block& output_block = *(etc_block*)gi.get_block_ptr(block_x, block_y);

						output_block.set_diff_bit(true);
						// Setting the flip bit to false to be compatible with the Khronos KDFS.
						//output_block.set_flip_bit(true);
						output_block.set_flip_bit(false);

						const uint32_t endpoint_index = m.m_endpoint_index;

						output_block.set_block_color5_etc1s(m_endpoint_palette[endpoint_index].m_color5);
						output_block.set_inten_tables_etc1s(m_endpoint_palette[endpoint_index].m_inten5);

						const uint32_t selector_idx = m.m_selector_index;

						const etc1_selector_palette_entry& selectors = m_selector_palette[selector_idx];
						for (uint32_t sy = 0; sy < 4; sy++)
							for (uint32_t sx = 0; sx < 4; sx++)
								output_block.set_selector(sx, sy, selectors(sx, sy));
					}

				} // block_x
			} // block_y

			m_output.m_slice_image_crcs[slice_index] = basist::crc16(gi.get_ptr(), gi.get_size_in_bytes(), 0);

			if (m_params.m_debug_images)
			{
				image gi_unpacked;
				gi.unpack(gi_unpacked);

				char buf[256];
#ifdef _WIN32				
				sprintf_s(buf, sizeof(buf), "basisu_backend_slice_%u.png", slice_index);
#else
				snprintf(buf, sizeof(buf), "basisu_backend_slice_%u.png", slice_index);
#endif