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Diffstat (limited to 'o3d/command_buffer/service/texture_utils.cc')
| -rw-r--r-- | o3d/command_buffer/service/texture_utils.cc | 102 |
1 files changed, 102 insertions, 0 deletions
diff --git a/o3d/command_buffer/service/texture_utils.cc b/o3d/command_buffer/service/texture_utils.cc new file mode 100644 index 0000000..d1d26dd --- /dev/null +++ b/o3d/command_buffer/service/texture_utils.cc @@ -0,0 +1,102 @@ +/* + * Copyright 2009, Google Inc. + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions are + * met: + * + * * Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * * Redistributions in binary form must reproduce the above + * copyright notice, this list of conditions and the following disclaimer + * in the documentation and/or other materials provided with the + * distribution. + * * Neither the name of Google Inc. nor the names of its + * contributors may be used to endorse or promote products derived from + * this software without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS + * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT + * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR + * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT + * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, + * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT + * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, + * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY + * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT + * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE + * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + */ + + +// This file contains the implementation of some utilities for textures. + +#include <stdlib.h> +#include "command_buffer/service/texture_utils.h" + +namespace command_buffer { + +void MakeTransferInfo(TransferInfo *transfer_info, + const MipLevelInfo &mip_level, + const Volume &volume, + unsigned int row_pitch, + unsigned int slice_pitch) { + transfer_info->row_pitch = row_pitch; + transfer_info->slice_pitch = slice_pitch; + transfer_info->row_size = + volume.width / mip_level.block_size_x * mip_level.block_bpp; + transfer_info->slice_size = transfer_info->row_size + + (volume.height / mip_level.block_size_y - 1) * row_pitch; + transfer_info->total_size = transfer_info->slice_size + + (volume.depth - 1) * slice_pitch; + transfer_info->packed = (transfer_info->row_size == row_pitch) && + (volume.depth == 1 || transfer_info->slice_size == slice_pitch); +} + +void MakePackedTransferInfo(TransferInfo *transfer_info, + const MipLevelInfo &mip_level, + const Volume &volume) { + transfer_info->row_size = + volume.width / mip_level.block_size_x * mip_level.block_bpp; + transfer_info->row_pitch = transfer_info->row_size; + transfer_info->slice_size = + volume.height / mip_level.block_size_y * transfer_info->row_pitch; + transfer_info->slice_pitch = transfer_info->slice_size; + transfer_info->total_size = volume.depth * transfer_info->slice_pitch; + transfer_info->packed = true; +} + +// Transfers a volume of texels. +void TransferVolume(const Volume &volume, + const MipLevelInfo &mip_level, + const TransferInfo &dst_transfer_info, + void *dst_data, + const TransferInfo &src_transfer_info, + const void *src_data) { + DCHECK_EQ(src_transfer_info.row_size, dst_transfer_info.row_size); + if (src_transfer_info.packed && dst_transfer_info.packed) { + // fast path + DCHECK_EQ(src_transfer_info.total_size, dst_transfer_info.total_size); + DCHECK_EQ(src_transfer_info.row_pitch, dst_transfer_info.row_pitch); + DCHECK_EQ(src_transfer_info.slice_pitch, dst_transfer_info.slice_pitch); + memcpy(dst_data, src_data, src_transfer_info.total_size); + } else { + const char *src = static_cast<const char *>(src_data); + char *dst = static_cast<char *>(dst_data); + for (unsigned int slice = 0; slice < volume.depth; ++slice) { + const char *row_src = src; + char *row_dst = dst; + for (unsigned int row = 0; row < volume.height; + row += mip_level.block_size_y) { + memcpy(row_dst, row_src, src_transfer_info.row_size); + row_src += src_transfer_info.row_pitch; + row_dst += dst_transfer_info.row_pitch; + } + src += src_transfer_info.slice_pitch; + dst += dst_transfer_info.slice_pitch; + } + } +} + +} // namespace command_buffer |